/* Castellano — warm editorial design, light and dark, fully offline. */
:root {
  --bg: #f7f1e4;
  --bg-deep: #f0e6d3;
  --surface: #fffdf8;
  --surface-2: #f3ead9;
  --surface-3: #ebdfc9;
  --ink: #241d18;
  --ink-soft: #3c332b;
  --muted: #726456;
  --line: #e1d3bc;
  --line-strong: #cdbb9f;
  --accent: #a91f2b;
  --accent-2: #c33a44;
  --accent-soft: #f4dddd;
  --accent-ink: #fff8ef;
  --gold: #8f5c12;
  --gold-soft: #f6e9cd;
  --green: #2f6f52;
  --green-soft: #dfeee5;
  --shadow: 0 1px 2px rgba(52, 36, 20, .04), 0 18px 40px -28px rgba(52, 36, 20, .3);
  --shadow-lg: 0 30px 80px -30px rgba(40, 24, 10, .35);
  --radius: 18px;
  --radius-lg: 26px;
  --max: 1180px;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, "Times New Roman", serif;
  --sans: "Inter", "SF Pro Text", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --arabic: "Noto Naskh Arabic", "Noto Sans Arabic", "Segoe UI Arabic", "Geeza Pro", "Arabic UI Text", serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
}

html[data-theme="dark"] {
  --bg: #171310;
  --bg-deep: #1d1814;
  --surface: #211b17;
  --surface-2: #2a231d;
  --surface-3: #332a22;
  --ink: #f4ecdf;
  --ink-soft: #e2d7c7;
  --muted: #b1a292;
  --line: #3a2f26;
  --line-strong: #514235;
  --accent: #ee7b80;
  --accent-2: #f28a8e;
  --accent-soft: #3b2224;
  --accent-ink: #1d1113;
  --gold: #e0b15c;
  --gold-soft: #362b1c;
  --green: #82c3a3;
  --green-soft: #1d2d25;
  --shadow: 0 1px 2px rgba(0, 0, 0, .2), 0 18px 40px -28px rgba(0, 0, 0, .8);
  --shadow-lg: 0 30px 80px -30px rgba(0, 0, 0, .85);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(1000px 500px at 8% -10%, rgba(169, 31, 43, .055), transparent 70%),
    radial-gradient(900px 500px at 100% 0%, rgba(179, 124, 37, .07), transparent 70%);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
img, svg { max-width: 100%; }
a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-family: var(--serif); font-weight: 600; line-height: 1.12; letter-spacing: -.015em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
[hidden] { display: none !important; }

/* ---------------- top bar ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 26px;
  height: 66px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; flex: none; }
.mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--accent-ink);
  font-family: var(--serif);
  font-size: 1.7rem;
  font-style: italic;
  font-weight: 700;
  line-height: 1;
  padding-bottom: 2px;
  box-shadow: 0 4px 12px -4px color-mix(in srgb, var(--accent) 40%, transparent),
              inset 0 1px 0 rgba(255, 255, 255, .15);
  position: relative;
  overflow: hidden;
}
.mark::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,.15) 0%, transparent 50%);
  pointer-events: none;
}
.brand-text { display: flex; flex-direction: column; font-family: var(--serif); font-size: 1.15rem; font-weight: 700; line-height: 1.05; letter-spacing: -.01em; }
.brand-text em { font-size: .62rem; font-family: var(--sans); font-style: normal; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-top: 3px; }

/* Side panel brand mark (larger, separate styling) */
.side-panel-brand .mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  font-size: 1.9rem;
  box-shadow: 0 6px 16px -4px color-mix(in srgb, var(--accent) 35%, transparent),
              inset 0 1px 0 rgba(255, 255, 255, .15);
}
.mainnav { display: flex; align-items: center; gap: 4px; }
.mainnav a {
  padding: 7px 12px;
  border-radius: 999px;
  text-decoration: none;
  font-size: .88rem;
  font-weight: 550;
  color: var(--muted);
  white-space: nowrap;
  transition: color .15s ease, background .15s ease;
}
.mainnav a:hover { color: var(--ink); background: var(--surface-2); }
.mainnav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 7px; flex: none; }
.qchip {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: .76rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  white-space: nowrap;
}
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1;
  transition: border-color .15s, transform .15s, background .15s;
}
.icon-btn:hover { border-color: var(--line-strong); transform: translateY(-1px); }
.nav-toggle { display: none; }

/* ---------------- buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 650;
  line-height: 1.2;
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease, border-color .16s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { background: var(--accent-2); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { background: var(--surface-2); color: var(--ink); box-shadow: none; }
.btn.small { min-height: 34px; padding: 6px 13px; font-size: .8rem; }
.btn.lg { min-height: 50px; padding: 12px 24px; font-size: .97rem; }
.btn.danger-soft { background: var(--accent-soft); border-color: transparent; color: var(--accent); }
.btn.is-complete { border-color: var(--green); color: var(--green); background: var(--green-soft); }

/* ---------------- dashboard ---------------- */
.dash { max-width: var(--max); margin: 0 auto; padding: 0 28px 80px; }
.eyebrow, .section-kicker {
  font-size: .7rem;
  font-weight: 750;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
}
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, .6fr);
  gap: 56px;
  align-items: center;
  padding: 62px 0 52px;
  border-bottom: 1px solid var(--line);
}
.hero h1 { font-size: clamp(2.7rem, 5.6vw, 4.7rem); margin: 14px 0 0; letter-spacing: -.03em; }
.hero h1 em { color: var(--accent); font-weight: 500; }
.lede { max-width: 58ch; margin-top: 22px; color: var(--ink-soft); font-size: 1.08rem; line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-note { margin-top: 14px; color: var(--muted); font-size: .8rem; }
.daily-note { margin-top: 6px; color: var(--accent); font-weight: 600; }
.daily-note.done { color: var(--green); }
.hero-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--surface) 0%, var(--surface-2) 100%);
  box-shadow: var(--shadow);
}
.ring {
  --pct: 0%;
  position: relative;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background: conic-gradient(var(--accent) var(--pct), var(--line) 0);
  display: grid;
  place-items: center;
}
.ring::after { content: ""; position: absolute; inset: 10px; border-radius: 50%; background: var(--surface); }
.ring-inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; }
.ring-inner strong { font-family: var(--serif); font-size: 2.4rem; line-height: 1; }
.ring-inner span { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-top: 5px; }
.hero-facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; width: 100%; text-align: center; }
.hero-facts div { display: flex; flex-direction: column; gap: 2px; }
.hero-facts strong { font-family: var(--serif); font-size: 1.25rem; line-height: 1; }
.hero-facts span { font-size: .62rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.hero-tip { text-align: center; font-size: .78rem; color: var(--muted); line-height: 1.45; }

.path { padding: 44px 0 10px; }
.path-head { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; margin-bottom: 18px; }
.path-head h2 { font-size: 1.45rem; }
.level-path { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.level-chip {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  text-decoration: none;
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.level-chip:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: var(--shadow); }
.level-chip-code { font-family: var(--serif); font-size: 1.35rem; font-weight: 600; color: var(--accent); }
.level-chip-name { font-size: .78rem; color: var(--ink-soft); }
.level-chip-count { font-size: .68rem; color: var(--muted); font-variant-numeric: tabular-nums; }

.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 46px 0 8px; padding: 34px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.how-item { display: flex; gap: 15px; }
.how-item > span { font-family: var(--serif); font-size: 1.5rem; color: var(--gold); line-height: 1; }
.how-item strong { display: block; font-family: var(--serif); font-size: 1.06rem; margin-bottom: 5px; }
.how-item p { font-size: .84rem; color: var(--muted); line-height: 1.55; }
.how-item em { color: var(--ink-soft); }

.groups { display: flex; flex-direction: column; gap: 54px; margin-top: 54px; }
.level-section { scroll-margin-top: 88px; }
.level-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; padding-bottom: 16px; margin-bottom: 20px; border-bottom: 1px solid var(--line); }
.level-title { display: flex; gap: 16px; align-items: flex-start; }
.level-badge {
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  height: 48px;
  padding: 0 10px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -.02em;
  flex: none;
}
.level-title h2 { font-size: 1.65rem; }
.level-title p { color: var(--muted); font-size: .87rem; margin-top: 4px; max-width: 62ch; }
.level-progress { display: flex; align-items: center; gap: 10px; flex: none; min-width: 150px; }
.bar { width: 100px; height: 6px; border-radius: 999px; background: var(--line); overflow: hidden; }
.bar span { display: block; height: 100%; border-radius: inherit; background: var(--accent); transition: width .5s ease; }
.level-progress > span { font-size: .72rem; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(285px, 1fr)); gap: 16px; }
.unit-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .3);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.unit-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow); }
.unit-card.is-done { background: linear-gradient(170deg, var(--surface) 0%, var(--green-soft) 180%); }
.unit-card.is-done::before { content: ""; position: absolute; left: 20px; right: 20px; top: -1px; height: 2px; border-radius: 2px; background: var(--green); }
.unit-top { display: flex; align-items: center; gap: 8px; }
.unit-num { font-family: var(--serif); font-size: 1.5rem; line-height: 1; color: var(--gold); margin-right: 2px; }
.level-pill {
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  padding: 1px 7px;
  border-radius: 5px;
  background: var(--surface-3);
  color: var(--ink-soft);
  font-size: .62rem;
  font-weight: 750;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.status { margin-left: auto; font-size: .68rem; font-weight: 650; color: var(--muted); }
.status.done { color: var(--green); }
.status.muted { font-weight: 500; }
.unit-card h3 { font-size: 1.32rem; margin-top: 13px; line-height: 1.15; }
.unit-card h3 a { text-decoration: none; }
.unit-card h3 a:hover { color: var(--accent); }
.unit-sub { font-size: .8rem; color: var(--ink-soft); margin-top: 8px; }
.unit-can { font-size: .76rem; color: var(--muted); line-height: 1.5; margin-top: 9px; flex: 1; }
.unit-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; font-size: .68rem; color: var(--muted); }
.unit-actions { display: flex; gap: 7px; margin-top: 16px; }
.unit-actions .btn { flex: 1; }
.dash-foot { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: .74rem; display: flex; flex-direction: column; gap: 4px; }
.backup { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 10px; }
.backup-note { font-size: .74rem; color: var(--green); }
.loading { color: var(--muted); padding: 30px 0; }

/* ---------------- lesson ---------------- */
.lesson-wrap { max-width: 1200px; margin: 0 auto; padding: 26px 28px 90px; }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: .74rem; color: var(--muted); }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { opacity: .5; }
.lesson-hero { max-width: 900px; padding: 22px 0 34px; border-bottom: 1px solid var(--line); }
.lesson-kicker { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 24px; font-size: .74rem; color: var(--muted); }
.lesson-kicker .level-badge { min-width: 38px; height: 30px; border-radius: 8px; font-size: .82rem; }
.lesson-hero h1 { font-size: clamp(2.6rem, 5.5vw, 4.3rem); margin-top: 12px; letter-spacing: -.03em; }
.lesson-sub { margin-top: 12px; font-size: 1.02rem; color: var(--ink-soft); }
.can-do { display: flex; gap: 14px; align-items: flex-start; margin-top: 24px; padding: 14px 18px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 12px 12px 0; }
.can-do-label { flex: none; font-size: .64rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); padding-top: 3px; }
.can-do p { font-size: .9rem; color: var(--ink-soft); }
.lesson-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 24px; }
.slow-toggle.active { color: var(--accent); background: var(--accent-soft); }
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 42px; align-items: start; margin-top: 36px; }
.lesson-main { min-width: 0; display: flex; flex-direction: column; gap: 24px; }
.panel { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow); scroll-margin-top: 88px; }
.panel-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; margin-bottom: 22px; }
.panel-head h2 { font-size: 1.7rem; margin-top: 4px; }
.panel-tools { display: flex; flex-wrap: wrap; gap: 7px; justify-content: flex-end; }
.count { display: inline-grid; place-items: center; min-width: 30px; height: 30px; padding: 0 9px; border-radius: 999px; background: var(--surface-2); color: var(--muted); font-size: .72rem; font-weight: 700; }
.dialogue { display: flex; flex-direction: column; gap: 16px; }
.turn { display: flex; gap: 11px; align-items: flex-start; }
.avatar { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--surface-2); color: var(--accent); font-family: var(--serif); font-size: .95rem; font-weight: 700; flex: none; border: 1px solid var(--line); }
.turn:nth-child(even) .avatar { background: var(--gold-soft); color: var(--gold); }
.bubble { flex: 1; min-width: 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 4px 16px 16px 16px; background: var(--surface-2); }
.turn:nth-child(even) .bubble { background: var(--surface); }
.turn-head { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.speaker { font-size: .67rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.turn-head .audio-btn { margin-left: auto; }
.line-es { font-size: 1.02rem; line-height: 1.55; color: var(--ink); }
.audio-btn {
  display: inline-grid;
  place-items: center;
  width: 29px;
  height: 29px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--surface);
  color: var(--accent);
  font-size: .62rem;
  line-height: 1;
  flex: none;
  transition: background .15s, color .15s, transform .15s;
}
.audio-btn:hover { background: var(--accent); color: var(--accent-ink); transform: scale(1.05); }
.audio-btn.small { width: 26px; height: 26px; font-size: .56rem; }
.audio-btn.playing { background: var(--accent); color: var(--accent-ink); animation: pulse 1.1s ease-in-out infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 18%, transparent); } }

.phrases-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.phrase-card { padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-2); }
.phrase-top { display: flex; align-items: flex-start; gap: 10px; }
.phrase-es { font-family: var(--serif); font-size: 1.16rem; line-height: 1.3; flex: 1; }
.note { font-size: .76rem; color: var(--ink-soft); line-height: 1.45; margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line-strong); }
.grammar-list { display: flex; flex-direction: column; gap: 28px; }
.grammar-card { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 16px; padding-top: 26px; border-top: 1px solid var(--line); }
.grammar-card:first-child { padding-top: 0; border-top: 0; }
.grammar-num { font-family: var(--serif); font-size: 1.2rem; color: var(--gold); line-height: 1; padding-top: 4px; }
.grammar-body h3 { font-size: 1.3rem; margin-bottom: 8px; }
.grammar-body > p { font-size: .9rem; color: var(--ink-soft); line-height: 1.6; }
.examples { display: flex; flex-direction: column; gap: 2px; margin-top: 15px; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.example-row { display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; background: var(--surface-2); }
.example-row + .example-row { border-top: 1px solid var(--line); }
.example-row > div { min-width: 0; }
.example-es { font-size: .92rem; line-height: 1.45; }
.hint { font-family: var(--mono); font-size: .7rem; color: var(--accent); margin-top: 4px; letter-spacing: .01em; }
.examples.compact { margin-top: 12px; }
.examples.compact .example-row { padding: 8px 11px; }
.examples.compact .example-es { font-size: .86rem; }

.sound-panel { background: linear-gradient(155deg, var(--surface) 0%, var(--gold-soft) 150%); }
.sound-panel .panel-head h2 { font-size: 1.5rem; }
.sound-wave { display: flex; align-items: center; gap: 3px; height: 32px; }
.sound-wave span { width: 3px; border-radius: 2px; background: var(--gold); height: 30%; animation: wave 1.4s ease-in-out infinite; }
.sound-wave span:nth-child(2) { height: 60%; animation-delay: .1s; }
.sound-wave span:nth-child(3) { height: 100%; animation-delay: .2s; }
.sound-wave span:nth-child(4) { height: 45%; animation-delay: .3s; }
.sound-wave span:nth-child(5) { height: 80%; animation-delay: .4s; }
.sound-wave span:nth-child(6) { height: 35%; animation-delay: .5s; }
.sound-wave span:nth-child(7) { height: 65%; animation-delay: .6s; }
@keyframes wave { 50% { transform: scaleY(.45); } }
.sound-body { font-size: .92rem; color: var(--ink-soft); line-height: 1.65; }
.culture-panel { border-left: 4px solid var(--gold); background: linear-gradient(160deg, var(--gold-soft) 0%, var(--surface) 70%); }
.culture-body { font-size: .94rem; line-height: 1.7; color: var(--ink-soft); }
.culture-mark { font-family: var(--serif); font-size: 1.9rem; color: var(--gold); font-style: italic; line-height: 1; }
.culture-title-ar { font-family: var(--arabic); font-size: 1.05rem; color: var(--muted); margin: 4px 0 8px; text-align: right; direction: rtl; unicode-bidi: isolate; }
.culture-body-ar { font-family: var(--arabic); font-size: .92rem; color: var(--muted); margin-top: 8px; text-align: right; direction: rtl; unicode-bidi: isolate; line-height: 1.75; }

.vocab-list { border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.vocab-row { display: grid; grid-template-columns: minmax(150px, 1fr) minmax(180px, 1.15fr) auto; gap: 14px; align-items: center; padding: 12px 14px; background: var(--surface); }
.vocab-row + .vocab-row { border-top: 1px solid var(--line); }
.vocab-row:nth-child(odd) { background: var(--surface-2); }
.vocab-word { display: flex; align-items: center; gap: 8px; min-width: 0; }
.vocab-word strong { font-size: .94rem; }
.pos { font-size: .64rem; font-style: italic; color: var(--muted); }
.vocab-meaning { font-size: .82rem; color: var(--ink-soft); }
.vocab-note { display: block; font-size: .72rem; color: var(--muted); margin-top: 2px; }
.vocab-actions { display: flex; align-items: center; gap: 8px; }
.register { font-size: .58rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--line-strong); padding: 1px 6px; border-radius: 4px; white-space: nowrap; }
.register.colloquial { color: var(--gold); border-color: color-mix(in srgb, var(--gold) 40%, transparent); }
.save-btn { display: grid; place-items: center; width: 29px; height: 29px; border: 1px solid var(--line-strong); border-radius: 50%; background: var(--surface); color: var(--muted); font-size: .95rem; line-height: 1; }
.save-btn:hover { border-color: var(--accent); color: var(--accent); }
.save-btn.saved { background: var(--green); border-color: var(--green); color: #fff; }
.roleplay-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.roleplay-card { padding: 18px; border: 1px dashed var(--line-strong); border-radius: 14px; background: var(--surface-2); }
.roleplay-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.roleplay-num { font-size: .62rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.roleplay-prompt { font-size: .9rem; margin-top: 9px; line-height: 1.55; }
.roleplay-example { margin-top: 12px; }
.roleplay-example summary { font-size: .76rem; color: var(--accent); cursor: pointer; font-weight: 600; }
.roleplay-example p { font-size: .82rem; color: var(--muted); margin-top: 6px; padding-left: 10px; border-left: 2px solid var(--line-strong); }
.lesson-finish { padding: 34px; border-radius: var(--radius-lg); background: var(--accent); color: var(--accent-ink); text-align: center; box-shadow: var(--shadow-lg); }
.finish-kicker { font-size: .64rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; opacity: .84; }
.lesson-finish h2 { font-size: 1.8rem; margin-top: 6px; }
.lesson-finish > p:not(.finish-kicker) { font-size: .88rem; opacity: .82; max-width: 52ch; margin: 8px auto 0; }
.finish-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin-top: 20px; }
.lesson-finish .btn { background: transparent; border-color: rgba(255, 255, 255, .4); color: inherit; }
.lesson-finish .btn.primary { background: var(--accent-ink); border-color: var(--accent-ink); color: var(--accent); }
.lesson-finish .btn.is-complete { background: rgba(255, 255, 255, .12); border-color: rgba(255, 255, 255, .65); color: #fff; }
.lesson-pager { display: flex; justify-content: space-between; gap: 14px; padding-top: 10px; }
.lesson-pager a { display: flex; flex-direction: column; gap: 3px; max-width: 46%; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); text-decoration: none; }
.lesson-pager a:hover { border-color: var(--accent); }
.lesson-pager span { font-size: .66rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.lesson-pager strong { font-family: var(--serif); font-size: 1rem; font-weight: 600; }
.lesson-pager .next { text-align: right; margin-left: auto; }
.lesson-aside { position: sticky; top: 88px; display: flex; flex-direction: column; gap: 12px; }
.aside-card { padding: 17px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.aside-label { font-size: .62rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc { display: flex; flex-direction: column; gap: 1px; }
.toc a { padding: 5px 0; font-size: .79rem; color: var(--muted); text-decoration: none; border-left: 2px solid transparent; padding-left: 9px; transition: color .15s, border-color .15s; }
.toc a:hover, .toc a.active { color: var(--accent); border-left-color: var(--accent); }
.aside-progress .mini-stat { display: flex; align-items: baseline; gap: 7px; margin-bottom: 5px; }
.aside-progress .mini-stat strong { font-family: var(--serif); font-size: 1.02rem; }
.aside-progress .mini-stat span { font-size: .66rem; color: var(--muted); }
.aside-progress .btn { width: 100%; margin-top: 8px; }
.aside-quote { background: var(--surface-2); }
.aside-quote p { font-family: var(--serif); font-style: italic; font-size: .88rem; line-height: 1.5; color: var(--muted); }

/* ---------------- reference pages ---------------- */
.ref-page { max-width: var(--max); margin: 0 auto; padding: 48px 28px 80px; }
.page-hero { max-width: 820px; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.3rem, 4.6vw, 3.8rem); margin-top: 12px; letter-spacing: -.03em; }
.page-hero .lede { margin-top: 14px; font-size: 1rem; }
.page-stats { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px; margin-top: 18px; font-size: .75rem; color: var(--muted); }
.page-stats strong { font-family: var(--serif); font-size: 1.05rem; color: var(--ink); }
.ref-tabs { display: inline-flex; gap: 3px; margin-top: 26px; padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.ref-tabs button { padding: 8px 17px; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font-size: .82rem; font-weight: 650; }
.ref-tabs button.active { background: var(--accent); color: var(--accent-ink); }
.ref-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 24px 0 20px; flex-wrap: wrap; }
.filter-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: .76rem;
  font-weight: 650;
}
.filter-chip span { font-size: .64rem; opacity: .7; font-variant-numeric: tabular-nums; }
.filter-chip:hover { border-color: var(--line-strong); color: var(--ink); }
.filter-chip.active { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.search-box { display: flex; align-items: center; gap: 8px; min-width: min(320px, 100%); padding: 0 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.search-box span { color: var(--muted); font-size: 1.05rem; }
.search-box input { width: 100%; height: 38px; border: 0; background: transparent; outline: none; font-size: .84rem; }
.search-box input::placeholder { color: var(--muted); opacity: .8; }
.ref-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; align-items: start; }
.ref-card { min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.ref-card-top { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.ref-unit { font-size: .65rem; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
.ref-card h2 { font-size: 1.35rem; line-height: 1.2; }
.ref-card > p { margin-top: 8px; font-size: .87rem; line-height: 1.62; color: var(--ink-soft); }
.ref-link { display: inline-block; margin-top: 14px; font-size: .74rem; font-weight: 650; color: var(--accent); text-decoration: none; }
.ref-link:hover { text-decoration: underline; }
.culture-ref { background: linear-gradient(160deg, var(--surface) 40%, var(--gold-soft) 160%); }
.grammar-ref .examples { margin-top: 14px; }
.grammar-ref:has(.conj-block[open]) { grid-column: 1 / -1; }
.grammar-ref:has(.conj-block[open]) > h2,
.grammar-ref:has(.conj-block[open]) > p,
.grammar-ref:has(.conj-block[open]) > .examples,
.grammar-ref:has(.conj-block[open]) > .ref-link { max-width: 760px; }
.conj-stack { min-width: 0; display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.conj-block { min-width: 0; border: 1px solid var(--line-strong); border-radius: 12px; background: var(--surface); overflow: hidden; }
.conj-block summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 11px 13px; cursor: pointer; list-style: none; }
.conj-block summary::-webkit-details-marker { display: none; }
.conj-block summary:hover { background: var(--surface-2); }
.conj-block[open] summary { background: var(--surface-2); border-bottom: 1px solid var(--line); }
.conj-summary-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.conj-kicker { font-size: .57rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.conj-summary-title { font-family: var(--serif); font-size: 1rem; line-height: 1.2; }
.conj-open { flex: none; font-size: .68rem; color: var(--muted); }
.conj-open::after { content: " ↓"; }
.conj-block[open] .conj-open::after { content: " ↑"; }
.conj-body { min-width: 0; padding: 12px 13px 14px; }
.conj-intro { font-size: .78rem; line-height: 1.5; color: var(--ink-soft); }
.conj-scroll { min-width: 0; max-width: 100%; margin-top: 10px; overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); -webkit-overflow-scrolling: touch; }
.conj-table { width: 100%; min-width: 610px; border-collapse: separate; border-spacing: 0; font-size: .72rem; line-height: 1.3; }
.conj-table th, .conj-table td { padding: 7px 9px; text-align: left; vertical-align: top; white-space: nowrap; border-bottom: 1px solid var(--line); }
.conj-table thead th { background: var(--surface-2); color: var(--muted); font-size: .59rem; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; }
.conj-table tbody tr:last-child th, .conj-table tbody tr:last-child td { border-bottom: 0; }
.conj-table tbody tr:nth-child(even) th, .conj-table tbody tr:nth-child(even) td { background: var(--surface-2); }
.conj-table tbody th { position: sticky; left: 0; background: var(--surface); z-index: 1; min-width: 104px; }
.conj-table tbody tr.conj-irregular th { box-shadow: inset 3px 0 0 var(--gold); }
.conj-verb { display: block; font-family: var(--serif); font-size: .86rem; font-weight: 600; line-height: 1.15; }
.conj-kind { display: inline-block; margin-top: 2px; font-size: .5rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
.conj-kind.irregular { color: var(--gold); }
.conj-note { margin-top: 10px; font-size: .72rem; line-height: 1.5; color: var(--muted); }
.conj-hint { display: none; margin: 8px 0 -2px; font-size: .67rem; color: var(--muted); }
.conj-legend { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 8px; margin-top: 8px; font-size: .66rem; color: var(--muted); }
.conj-legend .conj-kind { margin-top: 0; }
.conj-extra { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--line); }
.conj-extra-head { max-width: 820px; margin-bottom: 18px; }
.conj-extra-head h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); line-height: 1.1; letter-spacing: -.02em; margin-top: 7px; }
.conj-extra-head p:last-child { margin-top: 8px; font-size: .88rem; line-height: 1.6; color: var(--ink-soft); }
.empty { padding: 30px 0; color: var(--muted); font-size: .9rem; }
.empty-state { text-align: center; padding: 50px 20px; border: 1px dashed var(--line-strong); border-radius: var(--radius); background: var(--surface); }
.empty-state h3 { font-size: 1.4rem; margin-top: 12px; }
.empty-state p { max-width: 48ch; margin: 8px auto 18px; color: var(--muted); font-size: .88rem; }
.empty-emoji { font-size: 2rem; line-height: 1; }
.site-foot { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin-top: 52px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.site-foot a { text-decoration: none; color: var(--accent); }
.site-foot a:hover { text-decoration: underline; }

/* ---------------- vocabulary ---------------- */
.notebook-toolbar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.notebook-toolbar .search-box { flex: 1; min-width: 230px; }
.select { height: 39px; padding: 0 34px 0 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); font-size: .82rem; outline: none; }
.notebook-count { font-size: .74rem; color: var(--muted); white-space: nowrap; }
.notebook-list { margin-top: 16px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.notebook-item { display: flex; gap: 18px; justify-content: space-between; padding: 15px 18px; }
.notebook-item + .notebook-item { border-top: 1px solid var(--line); }
.notebook-item:nth-child(odd) { background: var(--surface-2); }
.notebook-main { min-width: 0; }
.notebook-word { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; }
.notebook-word strong { font-family: var(--serif); font-size: 1.08rem; }
.notebook-meaning { font-size: .84rem; color: var(--ink-soft); margin-top: 2px; }
.notebook-note { font-size: .74rem; color: var(--muted); margin-top: 3px; }
.notebook-side { display: flex; align-items: center; gap: 12px; flex: none; }
.notebook-src { font-size: .7rem; color: var(--muted); text-decoration: none; white-space: nowrap; }
.notebook-src:hover { color: var(--accent); }
.del-word { width: 27px; height: 27px; font-size: .72rem; }
.flash-shell { max-width: 590px; margin: 26px auto 0; }
.flash-meta { display: flex; justify-content: space-between; gap: 10px; font-size: .72rem; color: var(--muted); margin-bottom: 10px; }
.flashcard { display: block; width: 100%; height: 320px; padding: 0; border: 0; background: transparent; perspective: 1200px; text-align: left; }
.flash-inner { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform .5s cubic-bezier(.2, .7, .2, 1); }
.flashcard.flipped .flash-inner { transform: rotateY(180deg); }
.flash-face { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: linear-gradient(160deg, var(--surface) 0%, var(--surface-2) 130%); box-shadow: var(--shadow); backface-visibility: hidden; -webkit-backface-visibility: hidden; text-align: center; }
.flash-front .level-pill { position: absolute; top: 20px; left: 20px; }
.flash-word { font-family: var(--serif); font-size: clamp(2rem, 6vw, 3.1rem); line-height: 1.1; letter-spacing: -.02em; }
.flash-pos { font-size: .74rem; color: var(--muted); font-style: italic; }
.flash-tap { margin-top: 16px; font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.flash-back { transform: rotateY(180deg); background: linear-gradient(160deg, var(--accent) 0%, #7d1420 100%); color: var(--accent-ink); border-color: transparent; }
.flash-back::before { content: "Significado"; position: absolute; top: 20px; left: 20px; font-size: .62rem; letter-spacing: .14em; text-transform: uppercase; opacity: .6; }
.flash-note { font-size: .84rem; opacity: .82; max-width: 38ch; }
.flash-src { position: absolute; bottom: 20px; font-size: .66rem; letter-spacing: .08em; text-transform: uppercase; opacity: .6; }
.flash-actions { display: flex; justify-content: center; gap: 10px; margin-top: 20px; }
.flash-end, .flash-empty { max-width: 520px; margin: 32px auto 0; text-align: center; padding: 36px 24px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.flash-end h3, .flash-empty h3 { font-size: 1.6rem; margin-top: 10px; }
.flash-end p, .flash-empty p { margin-top: 8px; color: var(--muted); font-size: .86rem; }
.flash-empty { max-width: 560px; }

/* ---------------- practice modal ---------------- */
.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 18px; background: rgba(25, 16, 10, .55); backdrop-filter: blur(7px); }
.modal-card { width: min(740px, 100%); max-height: 92vh; overflow: auto; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); box-shadow: var(--shadow-lg); }
.modal-head { position: sticky; top: 0; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 22px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 94%, transparent); backdrop-filter: blur(10px); }
.modal-head > div { display: flex; align-items: center; gap: 10px; min-width: 0; }
.modal-head strong { font-family: var(--serif); font-size: 1.02rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pill { display: inline-flex; padding: 2px 8px; border-radius: 4px; background: var(--accent-soft); color: var(--accent); font-size: .6rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; white-space: nowrap; }
#pr-body { padding: 22px; }
body.modal-open { overflow: hidden; }
.pr-progress { height: 5px; border-radius: 999px; background: var(--line); overflow: hidden; }
.pr-progress span { display: block; height: 100%; background: var(--accent); border-radius: inherit; transition: width .3s ease; }
.pr-meta { display: flex; justify-content: space-between; gap: 10px; margin: 9px 0 16px; font-size: .7rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.q-card { padding: 4px 2px 2px; }
.q-kind { font-size: .64rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.q-hint { font-size: .78rem; color: var(--muted); margin-top: 3px; }
.q-prompt { font-family: var(--serif); font-size: clamp(1.35rem, 3.2vw, 1.85rem); line-height: 1.32; margin: 18px 0 20px; letter-spacing: -.01em; }
.q-prompt.small { font-size: 1.08rem; }
.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-opt {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  text-align: left;
  font-size: .9rem;
  line-height: 1.4;
  transition: border-color .15s, background .15s;
}
.q-opt:hover:not(:disabled) { border-color: var(--accent); background: var(--surface); }
.q-opt:disabled { cursor: default; }
.q-key { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--surface); border: 1px solid var(--line); font-size: .67rem; font-weight: 700; color: var(--muted); flex: none; }
.q-opt.correct { border-color: var(--green); background: var(--green-soft); }
.q-opt.correct .q-key { background: var(--green); border-color: var(--green); color: #fff; }
.q-opt.wrong { border-color: var(--accent); background: var(--accent-soft); }
.q-opt.wrong .q-key { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.q-feedback { display: flex; flex-direction: column; gap: 4px; margin-top: 16px; padding: 13px 15px; border-radius: 12px; font-size: .84rem; line-height: 1.5; }
.q-feedback.ok { background: var(--green-soft); border: 1px solid color-mix(in srgb, var(--green) 35%, transparent); }
.q-feedback.bad { background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.q-feedback strong { font-family: var(--serif); font-size: 1rem; }
.q-next { margin-top: 16px; display: flex; justify-content: flex-end; }
.q-actions { display: flex; justify-content: flex-end; margin-top: 14px; }
.order-answer { display: flex; flex-wrap: wrap; gap: 7px; min-height: 58px; padding: 11px; border: 1px dashed var(--line-strong); border-radius: 12px; background: var(--surface-2); }
.order-pool { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 13px; }
.chip { padding: 6px 11px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); font-size: .86rem; line-height: 1.3; }
.chip:hover:not(:disabled) { border-color: var(--accent); }
.chip.in { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.chip:disabled { opacity: .65; }
.order-empty { color: var(--muted); font-size: .8rem; padding: 6px; }
.listen-btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border: 1px solid var(--accent); border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: .9rem; }
.q-listen { display: flex; align-items: center; gap: 12px; margin: 20px 0; }
.q-listen span { font-size: .74rem; color: var(--muted); }
.pr-end { text-align: center; padding: 36px 10px 20px; }
.end-emoji { font-size: 2.5rem; line-height: 1; }
.pr-end h3 { font-size: 1.9rem; margin-top: 8px; }
.end-score { margin-top: 6px; color: var(--muted); font-size: .9rem; }
.end-score strong { color: var(--ink); }
.end-xp { display: inline-block; margin-top: 8px; padding: 3px 12px; border-radius: 999px; background: var(--gold-soft); color: var(--gold); font-size: .78rem; font-weight: 750; }
.end-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin-top: 20px; }
.end-note { margin-top: 14px; font-size: .7rem; color: var(--muted); }

/* ---------------- review ---------------- */
.review-page { max-width: 900px; }
.review-intro { padding: 20px 0 10px; }
.review-intro h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); margin-top: 10px; }
.review-intro .lede { font-size: 1rem; margin-top: 14px; }
.review-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 26px 0; }
.review-facts div { padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); text-align: center; }
.review-facts strong { display: block; font-family: var(--serif); font-size: 1.8rem; line-height: 1.1; }
.review-facts span { font-size: .68rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.review-note { margin-top: 12px; font-size: .74rem; color: var(--muted); }
.review-session-head { margin: 6px 0 20px; }
.review-session-head h2 { font-size: 1.7rem; margin-top: 2px; }
.review-page .pr-progress { margin-top: 10px; }
.review-page .pr-meta { margin-top: 9px; }
.review-page .q-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow); }
.review-page .pr-end { border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); margin-top: 20px; }

/* ---------------- misc ---------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 200;
  transform: translate(-50%, 20px);
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--bg);
  font-size: .8rem;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.lesson-loading { max-width: 700px; padding: 60px 0; }
.lesson-loading p { color: var(--accent); font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; }
.lesson-loading h1 { font-size: 3rem; margin-top: 6px; }

@media (max-width: 1060px) {
  .hero { gap: 36px; }
  .lesson-layout { grid-template-columns: minmax(0, 1fr); }
  .lesson-aside { display: none; }
  .lesson-hero { max-width: none; }
}
@media (max-width: 900px) {
  .topbar { gap: 14px; padding: 0 18px; }
  .mainnav {
    position: absolute;
    top: 66px;
    left: 14px;
    right: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface);
    box-shadow: var(--shadow-lg);
  }
  body.nav-open .mainnav { display: flex; }
  .mainnav a { padding: 10px 13px; border-radius: 9px; }
  .nav-toggle { display: none !important; }
  .hero { grid-template-columns: 1fr; padding-top: 42px; }
  .hero-panel { max-width: 430px; width: 100%; }
  .how { grid-template-columns: 1fr; gap: 20px; }
  .level-path { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .level-chip { padding: 10px; }
  .level-chip-name { font-size: .68rem; }
  .ref-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .dash, .ref-page, .lesson-wrap { padding-left: 18px; padding-right: 18px; }
  .hero h1 { font-size: clamp(2.35rem, 10vw, 3.4rem); }
  .hero-facts { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .path-head { flex-direction: column; align-items: flex-start; gap: 4px; }
  .level-path { grid-template-columns: repeat(2, 1fr); }
  .level-chip:last-child { grid-column: span 2; }
  .level-head { align-items: flex-start; flex-direction: column; gap: 12px; }
  .level-progress { width: 100%; }
  .bar { flex: 1; }
  .cards { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
  .panel-head { flex-direction: column; gap: 10px; }
  .panel-tools { justify-content: flex-start; }
  .phrases-grid, .roleplay-list { grid-template-columns: 1fr; }
  .vocab-row { grid-template-columns: 1fr auto; gap: 8px 10px; }
  .vocab-meaning { grid-column: 1 / -1; grid-row: 2; }
  .vocab-actions { grid-column: 2; grid-row: 1; }
  .grammar-card { grid-template-columns: 1fr; gap: 4px; }
  .grammar-num { font-size: .9rem; }
  .conj-table { min-width: 560px; font-size: .68rem; }
  .conj-table th, .conj-table td { padding: 6px 8px; }
  .conj-summary-title { font-size: .94rem; }
  .conj-hint { display: block; }
  .conj-body { padding: 10px 11px 12px; }
  .lesson-actions .btn { flex: 1 1 auto; }
  .lesson-pager a { max-width: 48%; padding: 12px; }
  .ref-toolbar { align-items: stretch; }
  .search-box { min-width: 100%; }
  .review-facts { grid-template-columns: 1fr; }
  .notebook-item { flex-direction: column; gap: 8px; }
  .notebook-side { justify-content: space-between; }
  .flashcard { height: 290px; }
  .modal { padding: 0; }
  .modal-card { max-height: 100vh; height: 100%; border-radius: 0; border: 0; }
  .modal-head { padding: 14px 16px; }
  #pr-body { padding: 16px; }
  .q-prompt { font-size: 1.3rem; }
  .q-options { gap: 6px; }
  .q-opt { padding: 10px 11px; font-size: .85rem; }
  .site-foot { flex-direction: column; gap: 6px; }
}
@media (max-width: 520px) {
  .topbar { padding: 0 13px; gap: 8px; }
  .brand-text { font-size: .96rem; }
  .brand-text em { font-size: .55rem; }
  .qchip { display: none; }
  .top-actions { gap: 5px; }
  .hero { padding-top: 34px; }
  .hero-panel { padding: 20px 16px; }
  .stage-warning { display: none; }
  .flashcard { height: 270px; }
  .flash-word { font-size: 2rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

/* ========================================================================
   Castellano v2 additions — same design system, new capabilities
   ======================================================================== */

/* clickable dialogue words (offline mini-dictionary) */
.bubble { position: relative; }
.line-es { cursor: default; }
.dword {
  cursor: pointer;
  border-radius: 3px;
  padding: 1px 1px;
  text-decoration: underline dotted var(--line-strong);
  text-underline-offset: 3px;
  transition: background-color .15s, color .15s;
}
.dword:hover, .dword:focus-visible { background: var(--accent-soft); color: var(--accent); outline: none; }
.line-dict-hint {
  display: block;
  margin-top: 4px;
  font-size: .72rem;
  color: var(--muted);
}
.word-pop {
  position: absolute;
  z-index: 40;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  max-width: 300px;
  min-width: 180px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: .85rem;
  color: var(--ink);
}
.word-pop-word { font-weight: 700; font-family: var(--serif); font-size: 1rem; }
.word-pop-actions { display: flex; align-items: center; gap: 8px; margin-top: 2px; }
.word-pop-x {
  margin-left: auto;
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: .9rem;
  line-height: 1;
}
.word-pop-x:hover { color: var(--accent); }

/* written-production exercise */
.q-input {
  width: 100%;
  margin-top: 8px;
  padding: 11px 13px;
  font: inherit;
  font-size: .95rem;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
}
.q-input:focus { outline: none; border-color: var(--accent); background: var(--surface); }
.q-input:disabled { opacity: .75; }
.q-input-note { margin-top: 5px; font-size: .72rem; color: var(--muted); }
.wd-diff { line-height: 1.7; display: block; }
.wd-diff span { margin-right: 4px; }
.wd-miss {
  text-decoration: underline wavy var(--accent);
  text-underline-offset: 3px;
  color: var(--accent);
  font-weight: 600;
}
.wd-extra { font-style: italic; color: var(--muted); font-size: .85em; }

/* microphone in oral exam tasks */
.mic-box {
  margin-top: 10px;
  padding: 10px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  background: var(--surface-2);
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
}
.mic-btn {
  padding: 8px 14px;
  font: inherit;
  font-size: .85rem;
  color: var(--accent-ink);
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
.mic-btn:hover { background: var(--accent-2); }
.mic-playback { flex: 1 1 220px; height: 34px; }
.mic-note { font-size: .72rem; color: var(--muted); }

/* microphone permission banner */
.mic-banner {
  max-width: var(--max);
  margin: 18px auto 0;
  padding: 16px 20px;
  background: var(--gold-soft);
  border: 1px solid var(--gold);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: .92rem;
}
.mic-banner p { margin: 0 0 6px; }
.mic-banner ol { margin: 6px 0 0 18px; padding: 0; }
.mic-banner li { margin: 3px 0; }
.mic-banner code { font-family: var(--mono); background: var(--surface-2); padding: 1px 6px; border-radius: 6px; }

/* ========================================================================
   Pronunciación page (v2) — drills, pairs, twisters, stress
   ======================================================================== */
.pron-section { margin-top: 26px; }
.section-head { margin-bottom: 14px; }
.section-head .section-kicker { text-transform: uppercase; letter-spacing: .08em; font-size: .72rem; color: var(--accent); font-weight: 700; }
.section-head h2 { margin: 2px 0 6px; font-family: var(--serif); }
.section-lede { color: var(--muted); font-size: .92rem; max-width: 70ch; }
.pron-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.pron-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.drill-head { display: flex; align-items: center; gap: 10px; }
.drill-word { font-family: var(--serif); font-size: 1.25rem; font-weight: 700; margin: 0; }
.drill-word.twister-text { font-size: 1.02rem; line-height: 1.45; }
.drill-hint { margin: 2px 0 0; color: var(--gold); font-size: .85rem; font-weight: 700; }
.drill-sound { display: inline-block; margin-left: 8px; padding: 2px 8px; border-radius: 20px; background: var(--gold-soft); color: var(--gold); font-size: .72rem; font-weight: 700; }
.ab-box { display: flex; flex-direction: column; gap: 6px; padding: 10px; background: var(--surface-2); border-radius: 12px; border: 1px dashed var(--line-strong); }
.ab-row { display: flex; align-items: center; gap: 10px; }
.ab-row.has-audio .audio-btn { border-color: var(--green); color: var(--green); }
.ab-tag { font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); width: 84px; }
.drill-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.drill-note { margin: 0; font-size: .78rem; color: var(--muted); }
.rate-row { display: inline-flex; gap: 8px; flex-wrap: wrap; }
.rate-chip:not(.active) { opacity: .75; }
.pairs-shell { max-width: 640px; margin: 6px auto 0; }
.pairs-opts { display: flex; gap: 10px; }
.pairs-opts .q-opt { flex: 1; justify-content: center; }
.pairs-score { text-align: center; margin-top: 10px; color: var(--muted); font-size: .85rem; }
.twister .drill-actions { margin-top: 2px; }
.twister .audio-btn.small { align-self: flex-end; }

/* ========================================================================
   Side panel navigation — modern drawer (replaces bottom tab bar)
   ======================================================================== */
.side-panel {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  max-width: 85vw;
  background: var(--surface);
  border-right: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  z-index: 70;
  transform: translateX(-100%);
  transition: transform var(--dur-slow) var(--ease-out);
  overflow-y: auto;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
}
.side-panel.open { transform: translateX(0); }
.side-panel-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .4);
  z-index: 65;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.side-panel-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
.side-panel-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.side-panel-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.side-panel-close:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.side-panel-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.side-panel-brand .mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-size: 1.9rem;
  font-style: italic;
  font-weight: 700;
  line-height: 1;
  padding-bottom: 2px;
  box-shadow: 0 6px 16px -4px color-mix(in srgb, var(--accent) 35%, transparent),
              inset 0 1px 0 rgba(255, 255, 255, .15);
  position: relative;
  overflow: hidden;
}
.side-panel-brand-text {
  display: flex;
  flex-direction: column;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.1;
}
.side-panel-brand-text em {
  font-size: .65rem;
  font-family: var(--sans);
  font-style: normal;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}
.side-panel-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  margin: 0 12px 8px;
  background: var(--surface-2);
  border-radius: 12px;
  border: 1px solid var(--line);
}
.side-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  font-size: 1rem;
  border: 2px solid var(--accent);
  flex-shrink: 0;
}
.side-profile-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.side-profile-name {
  font-size: .9rem;
  font-weight: 650;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.side-profile-stats {
  font-size: .72rem;
  color: var(--muted);
}
.side-panel-nav {
  flex: 1;
  padding: 0 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.side-panel-nav a,
.side-panel-nav button {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--ink-soft);
  font-size: .92rem;
  font-weight: 550;
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  width: 100%;
  text-align: left;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.side-panel-nav a:hover,
.side-panel-nav button:hover {
  background: var(--surface-2);
  color: var(--ink);
}
.side-panel-nav a[aria-current="page"],
.side-panel-nav a.on {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 650;
}
.side-panel-nav .nav-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  opacity: .7;
}
.side-panel-nav a[aria-current="page"] .nav-icon,
.side-panel-nav a.on .nav-icon {
  opacity: 1;
}
.side-panel-nav .nav-label {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.side-panel-nav .nav-label-ar {
  font-family: var(--arabic);
  font-size: .75rem;
  color: var(--muted);
  margin-top: 1px;
  direction: rtl;
  text-align: right;
  unicode-bidi: isolate;
}
.side-panel-nav a[aria-current="page"] .nav-label-ar,
.side-panel-nav a.on .nav-label-ar {
  color: var(--accent);
  opacity: .8;
}
.side-panel-footer {
  padding: 16px 20px 0;
  border-top: 1px solid var(--line);
  margin-top: 12px;
  display: flex;
  gap: 8px;
  align-items: center;
}
.side-panel-footer .qchip {
  font-size: .75rem;
}
.side-panel-trigger {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 55;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.side-panel-trigger:hover {
  background: var(--surface-2);
  transform: scale(1.05);
}
.side-panel-trigger svg {
  width: 22px;
  height: 22px;
  color: var(--ink);
}
.side-panel-trigger-inline {
  position: static;
  box-shadow: none;
  margin-right: 4px;
}

/* Phone UI — bottom tab bar still available as fallback */
.tabbar { display: none; }
@media (max-width: 900px) {
  body { padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px)); }
  .topbar {
    height: 58px;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--bg);
  }
  .nav-toggle { display: none; }
  .mainnav {
    position: fixed;
    top: auto;
    bottom: calc(78px + env(safe-area-inset-bottom, 0px));
    left: 10px;
    right: 10px;
    transform-origin: bottom center;
    animation: sheet-in .18s ease;
  }
  @keyframes sheet-in {
    from { opacity: 0; transform: translateY(10px) scale(.97); }
  }
  .tabbar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 60;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    align-items: stretch;
    padding: 5px 6px calc(5px + env(safe-area-inset-bottom, 0px));
    background: color-mix(in srgb, var(--surface) 90%, transparent);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-top: 1px solid var(--line);
    box-shadow: 0 -10px 30px -18px rgba(40, 24, 10, .35);
  }
  .tabbar a,
  .tabbar button {
    display: grid;
    justify-items: center;
    align-content: center;
    gap: 3px;
    min-height: 50px;
    padding: 4px 2px;
    border: 0;
    border-radius: 12px;
    background: none;
    color: var(--muted);
    font: inherit;
    font-size: .62rem;
    font-weight: 700;
    letter-spacing: .02em;
    text-decoration: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: color .15s ease, background .15s ease;
  }
  .tabbar svg { width: 23px; height: 23px; display: block; transition: transform .18s ease; }
  .tabbar .on { color: var(--accent); }
  .tabbar .on svg { transform: translateY(-1px) scale(1.08); }
  .tabbar a:active,
  .tabbar button:active { background: var(--surface-2); }
}
@media (max-width: 720px) {
  /* one-thumb comfort: bigger answers, bigger audio buttons, no iOS input zoom */
  .q-opt { padding: 14px 15px; font-size: .95rem; }
  .audio-btn { width: 40px; height: 40px; font-size: .8rem; }
  .audio-btn.small { width: 33px; height: 33px; font-size: .7rem; }
  .turn-head .audio-btn { margin-left: auto; }
  input, select, textarea { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .flashcard { height: 250px; }
  .flash-word { font-size: 1.7rem; }
}

/* ========================================================================
   Arabic help layer — the help translation is Arabic, never mixed inline.
   Every Arabic string lives in its own isolated element with dir="rtl"
   (attribute set in the templates, belt-and-braces mirrored here).
   ======================================================================== */
.line-ar, .phrase-ar, .example-ar, .lesson-ar, .word-pop-ar, .flash-ar {
  direction: rtl;
  unicode-bidi: isolate;
  text-align: right;
  font-family: 'Noto Naskh Arabic', 'Noto Sans Arabic', 'Segoe UI Arabic', 'Geeza Pro', 'Arabic UI Text', serif;
  font-size: 1.02em;
  line-height: 1.75;
  color: var(--muted);
}
body.hide-translations .line-ar { display: none; }
.line-ar { margin-top: 4px; }
.phrase-ar { margin-top: 4px; }
.example-ar { margin-top: 1px; }
.lesson-ar { margin-top: 3px; }
.word-pop-ar { margin: 2px 0 0; color: var(--ink-soft); }
.flash-ar {
  /* flashcard back keeps its display size; the muted color does not apply there */
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1.55;
  color: inherit;
}
.unit-ar, .level-ar, .drill-ar, .vocab-gloss, .notebook-meaning, .fb-ar, .q-prompt[dir="rtl"], .q-opt-ar {
  direction: rtl;
  unicode-bidi: isolate;
  font-family: 'Noto Naskh Arabic', 'Noto Sans Arabic', 'Segoe UI Arabic', 'Geeza Pro', 'Arabic UI Text', serif;
}
.unit-ar { text-align: right; font-size: .92rem; line-height: 1.75; color: var(--muted); margin-top: 2px; }
.level-ar { font-size: .78rem; font-weight: 600; color: var(--muted); margin-left: 6px; }
.drill-ar { text-align: right; font-size: .88rem; line-height: 1.7; color: var(--muted); margin: 0; }
.vocab-gloss { display: block; text-align: right; font-size: .88rem; line-height: 1.75; }
.notebook-meaning { text-align: right; line-height: 1.75; }
.fb-ar { display: block; text-align: right; font-size: 1.02em; margin-top: 4px; }
.q-prompt[dir="rtl"] { text-align: right; }
.q-opt-ar { text-align: right; }
/* Spanish lines that used to ride along on -en class names */
.word-pop-none { margin: 2px 0 0; color: var(--muted); font-style: italic; }
.drill-focus { margin: 0; color: var(--muted); font-size: .85rem; }

/* ========================================================================
   Account page
   ======================================================================== */
.account-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 24px 48px;
}
.account-hero {
  text-align: center;
  padding: 24px 0 32px;
}
.account-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 8px 0 12px;
}
.account-hero .lede {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 60ch;
  margin: 0 auto;
}
.account-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: center;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}
.account-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  font-size: 2rem;
  border: 3px solid var(--accent);
}
.account-info {
  min-width: 0;
}
.account-stats {
  display: flex;
  gap: 20px;
}
.account-section {
  margin-bottom: 32px;
}
.account-section h2 {
  font-family: var(--serif);
  font-size: 1.4rem;
  margin-bottom: 6px;
}
.account-section .section-lede {
  color: var(--muted);
  font-size: .95rem;
  margin-bottom: 16px;
  max-width: 60ch;
}
.backup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.backup-option {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.backup-icon {
  font-size: 1.8rem;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
}
.backup-option h3 {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin: 0;
}
.backup-option p {
  color: var(--muted);
  font-size: .85rem;
  line-height: 1.5;
  flex: 1;
}
.tips {
  padding-left: 20px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.tips li { margin-bottom: 6px; }
.tips strong { color: var(--accent); }
@media (max-width: 720px) {
  .account-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .account-avatar { margin: 0 auto; }
  .account-stats { justify-content: center; }
}

/* ========================================================================
   User profile & backup section
   ======================================================================== */
.user-profile {
  max-width: var(--max);
  margin: 0 auto 24px;
  padding: 0 24px;
}
.profile-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.profile-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  font-size: 1.6rem;
  border: 2px solid var(--accent);
}
.profile-label {
  display: block;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}
.profile-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--ink);
  font: inherit;
  font-size: .95rem;
  transition: border-color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.profile-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}
.profile-hint {
  margin-top: 4px;
  font-size: .75rem;
  color: var(--muted);
  line-height: 1.4;
}
.profile-stats {
  display: flex;
  gap: 16px;
}
.profile-stat {
  text-align: center;
}
.profile-stat strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--accent);
}
.profile-stat span {
  font-size: .65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}
.backup {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  align-items: center;
}
.backup-note {
  font-size: .78rem;
  color: var(--muted);
  min-height: 1.2em;
}
@media (max-width: 720px) {
  .profile-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .profile-avatar { margin: 0 auto; }
  .profile-stats { justify-content: center; }
  .backup { justify-content: center; }
}

/* ========================================================================
   GUI polish — smooth, relaxing feel & rhythm (all devices)
   ======================================================================== */
:root {
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-in-out: cubic-bezier(.4, 0, .2, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  --dur-fast: 140ms;
  --dur-base: 260ms;
  --dur-slow: 420ms;
}

/* Smooth, gentle transitions everywhere */
.btn, .tabbar a, .tabbar button, .audio-btn, .level-chip, .save-btn,
.icon-btn, .q-opt, .unit-card, .flashcard, .vocab-card, .conj-card {
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-base) var(--ease-in-out),
              border-color var(--dur-base) var(--ease-in-out),
              color var(--dur-base) var(--ease-in-out),
              box-shadow var(--dur-base) var(--ease-in-out),
              opacity var(--dur-base) var(--ease-in-out);
}

/* Gentle press feedback */
.btn:active, .save-btn:active, .audio-btn:active,
.q-opt:active, .icon-btn:active {
  transform: scale(.96);
  transition-duration: 80ms;
}
.tabbar a:active, .tabbar button:active { transform: scale(.95); }
.unit-card:active { transform: translateY(1px) scale(.992); }
.level-chip:active { transform: translateY(0) scale(.97); }

/* Card hover — lift gently */
.unit-card:hover, .level-chip:hover, .vocab-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.audio-btn:hover { transform: scale(1.06); }

/* Smooth pulse for playing audio */
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 0%, transparent); }
  50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 16%, transparent); }
}
.audio-btn.playing { animation: pulse 1.6s var(--ease-in-out) infinite; }

/* Gentle sound wave */
@keyframes wave {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(.45); }
}
.sound-wave span { animation: wave 1.4s var(--ease-in-out) infinite; }

/* Page entrance — smooth fade + subtle rise */
@keyframes fade-up {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}
.dash, .lesson-wrap, .ref-page { animation: fade-up var(--dur-slow) var(--ease-out) both; }

/* Smooth fade-in for sections and cards */
@keyframes fade-in {
  from { opacity: 0; transform: translateY(16px) scale(.98); }
  to { opacity: 1; transform: none; }
}
.fade-in {
  animation: fade-in var(--dur-slow) var(--ease-out) both;
  animation-delay: inherit;
}

/* Staggered card entrance */
@keyframes card-in {
  from { opacity: 0; transform: translateY(16px) scale(.98); }
  to { opacity: 1; transform: none; }
}
.unit-card, .vocab-card, .conj-card, .pron-card, .flashcard {
  animation: card-in var(--dur-slow) var(--ease-out) both;
}

/* Scroll-triggered reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: none;
}
.reveal-left {
  opacity: 0;
  transform: translateX(-24px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal-left.visible {
  opacity: 1;
  transform: none;
}
.reveal-scale {
  opacity: 0;
  transform: scale(.96);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal-scale.visible {
  opacity: 1;
  transform: none;
}
.unit-card:nth-child(2), .vocab-card:nth-child(2), .pron-card:nth-child(2) { animation-delay: 40ms; }
.unit-card:nth-child(3), .vocab-card:nth-child(3), .pron-card:nth-child(3) { animation-delay: 80ms; }
.unit-card:nth-child(4), .vocab-card:nth-child(4), .pron-card:nth-child(4) { animation-delay: 120ms; }
.unit-card:nth-child(5), .vocab-card:nth-child(5), .pron-card:nth-child(5) { animation-delay: 160ms; }
.unit-card:nth-child(n+6) { animation-delay: 200ms; }

/* Toast — smooth slide */
.toast {
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Mobile bottom sheet — smooth slide up */
@keyframes sheet-in {
  from { opacity: 0; transform: translateY(16px) scale(.96); }
  to { opacity: 1; transform: none; }
}

/* Flashcard flip — smooth 3D */
.flash-inner {
  transition: transform .5s var(--ease-out);
}

/* Progress bar fill — smooth */
.bar span, .pr-progress span {
  transition: width var(--dur-slow) var(--ease-out);
}

/* Gentle floating for hero elements */
@keyframes float-gentle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
.hero-panel { animation: float-gentle 6s var(--ease-in-out) infinite; }

/* Smooth focus ring */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
  transition: outline-offset .15s var(--ease-out);
}

/* Exam pulse */
@keyframes exam-pulse {
  0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--paper-stamp) 0%, transparent); }
  50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--paper-stamp) 14%, transparent); }
}

/* Exam wave */
@keyframes exam-wave {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(.4); }
}

@media (max-width: 720px) {
  .turn { gap: 10px; }
  .bubble { padding: 14px 16px; }
  .line-es { font-size: 1.06rem; line-height: 1.5; }
  .line-ar { font-size: 1.04em; }
  .phrase-es { font-size: 1.02rem; }
  .vocab-word strong { font-size: 1.05rem; }
  .hero h1 { letter-spacing: -0.02em; }
  .q-prompt { font-size: 1.35rem; line-height: 1.35; }
  .flashcard { border-radius: 22px; }
  /* Softer animations on small screens */
  .unit-card, .vocab-card, .pron-card { animation-duration: 350ms; }
  .hero-panel { animation: none; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
    animation-iteration-count: 1 !important;
  }
  .hero-panel { animation: none; }
}