:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --sidebar-bg: #ffffff;
  --sidebar-fg: #1b2430;
  --sidebar-fg-dim: #6b7280;
  --sidebar-active: #f0f2f5;
  --sidebar-border: #e2e5ea;
  --sidebar-hover: rgba(0, 0, 0, 0.045);
  --sidebar-fg-strong: #10151c;
  --chip-bg: rgba(0, 0, 0, 0.06);
  --accent: #e8871e;
  --accent-dark: #c96f10;
  --text: #1b2430;
  --text-dim: #5b6472;
  --border: #e2e5ea;
  --correct: #1f9254;
  --correct-bg: #e6f6ec;
  --wrong: #d1453d;
  --wrong-bg: #fbeceb;
  --pending: #c9ccd1;
  --overlay: rgba(20, 24, 32, 0.45);
  --radius: 10px;
  --shadow: 0 1px 3px rgba(20, 24, 32, 0.08), 0 1px 2px rgba(20, 24, 32, 0.06);
  --gender-m: #2f6fd6;
  --gender-m-bg: #e8f0fd;
  --gender-f: #d43d7a;
  --gender-f-bg: #fce8f0;
  --gender-n: #2f9e5c;
  --gender-n-bg: #e6f7ed;
  --gender-pl: #8b5cf6;
  --gender-pl-bg: #f1ebfd;
  --gender-x: #6b7280;
  --gender-x-bg: rgba(107, 114, 128, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171c;
    --panel: #1c2027;
    --sidebar-bg: #0f1216;
    --sidebar-fg: #d7dbe0;
    --sidebar-fg-dim: #7d8590;
    --sidebar-active: #262c35;
    --sidebar-border: rgba(255, 255, 255, 0.08);
    --sidebar-hover: rgba(255, 255, 255, 0.06);
    --sidebar-fg-strong: #ffffff;
    --chip-bg: rgba(255, 255, 255, 0.08);
    --text: #e6e9ed;
    --text-dim: #a3aab5;
    --border: #2a2f38;
    --correct: #4caf7d;
    --correct-bg: #16281f;
    --wrong: #e57373;
    --wrong-bg: #2c1a1a;
    --pending: #3a3f48;
    --overlay: rgba(0, 0, 0, 0.6);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --gender-m-bg: rgba(47, 111, 214, 0.18);
    --gender-f-bg: rgba(212, 61, 122, 0.18);
    --gender-n-bg: rgba(47, 158, 92, 0.18);
    --gender-pl-bg: rgba(139, 92, 246, 0.2);
    --gender-x-bg: rgba(255, 255, 255, 0.1);
  }
}

:root[data-theme="dark"] {
  --bg: #14171c;
  --panel: #1c2027;
  --sidebar-bg: #0f1216;
  --sidebar-fg: #d7dbe0;
  --sidebar-fg-dim: #7d8590;
  --sidebar-active: #262c35;
  --sidebar-border: rgba(255, 255, 255, 0.08);
  --sidebar-hover: rgba(255, 255, 255, 0.06);
  --sidebar-fg-strong: #ffffff;
  --chip-bg: rgba(255, 255, 255, 0.08);
  --text: #e6e9ed;
  --text-dim: #a3aab5;
  --border: #2a2f38;
  --correct: #4caf7d;
  --correct-bg: #16281f;
  --wrong: #e57373;
  --wrong-bg: #2c1a1a;
  --pending: #3a3f48;
  --overlay: rgba(0, 0, 0, 0.6);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  --gender-m-bg: rgba(47, 111, 214, 0.18);
  --gender-f-bg: rgba(212, 61, 122, 0.18);
  --gender-n-bg: rgba(47, 158, 92, 0.18);
  --gender-pl-bg: rgba(139, 92, 246, 0.2);
  --gender-x-bg: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

#app { display: flex; width: 100%; min-height: 100vh; }

/* Sidebar */
#sidebar {
  width: 280px;
  flex: 0 0 280px;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  display: flex;
  flex-direction: column;
  padding: 20px 0;
}
#section-switcher {
  display: flex;
  gap: 4px;
  margin: 0 20px 16px;
  padding: 3px;
  background: var(--chip-bg);
  border-radius: 9px;
}
.section-btn {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 7px;
  padding: 8px 6px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--sidebar-fg-dim);
  cursor: pointer;
  white-space: nowrap;
}
.section-btn:hover { color: var(--sidebar-fg-strong); }
.section-btn.active { background: var(--panel); color: var(--sidebar-fg-strong); box-shadow: var(--shadow); }
#sidebar-header {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--sidebar-border);
  margin-bottom: 8px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}
#canton-switcher { display: flex; gap: 8px; margin-bottom: 10px; }
.canton-btn {
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1.5px solid transparent;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.55;
  transition: opacity 0.15s, border-color 0.15s;
}
.canton-btn svg { width: 22px; height: 22px; display: block; }
.canton-btn:hover { opacity: 0.85; }
.canton-btn.active { opacity: 1; border-color: var(--accent); background: var(--sidebar-hover); }

#sidebar-header h1 {
  font-size: 17px;
  margin: 0 0 2px;
  color: var(--sidebar-fg-strong);
  letter-spacing: 0.2px;
}
#sidebar-header p {
  margin: 0;
  font-size: 12.5px;
  color: var(--sidebar-fg-dim);
}
#quiz-list, #grammar-nav-list {
  list-style: none;
  margin: 0;
  padding: 4px 10px;
  overflow-y: auto;
  flex: 1;
}
.quiz-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  color: var(--sidebar-fg);
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  margin-bottom: 3px;
  font-size: 14px;
}
.quiz-item:hover { background: var(--sidebar-hover); }
.quiz-item.active { background: var(--sidebar-active); }
.quiz-item .qi-title { font-weight: 600; color: var(--sidebar-fg-strong); }
.quiz-item .qi-sub {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4px;
  font-size: 11.5px;
  color: var(--sidebar-fg-dim);
}
.badge {
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
}
.badge.not-started { background: var(--chip-bg); color: var(--sidebar-fg-dim); }
.badge.in-progress { background: rgba(232,135,30,0.18); color: var(--accent-dark); }
.badge.passed { background: var(--correct-bg); color: var(--correct); }
.badge.failed { background: var(--wrong-bg); color: var(--wrong); }

.mini-bar {
  height: 3px;
  border-radius: 3px;
  background: var(--chip-bg);
  overflow: hidden;
  margin-top: 6px;
}
.mini-bar > div { height: 100%; background: var(--accent); }

.grammar-nav-item .qi-sub { display: block; margin-top: 2px; }

#sidebar-footer {
  padding: 12px 20px 0;
  border-top: 1px solid var(--sidebar-border);
  margin-top: 8px;
  display: flex;
  gap: 8px;
}
#sidebar-footer button {
  background: none;
  border: 1px solid var(--sidebar-border);
  color: var(--sidebar-fg-dim);
  font-size: 12px;
  padding: 7px 10px;
  border-radius: 7px;
  cursor: pointer;
}
#sidebar-footer #reset-all-btn { flex: 1; width: auto; }
#sidebar-footer button:hover { color: var(--sidebar-fg-strong); border-color: var(--accent); }

#theme-toggle-btn {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  padding: 7px 11px;
}

/* Main */
#main {
  flex: 1;
  min-width: 0;
  padding: 32px 40px 60px;
  overflow-y: auto;
}
.container { max-width: 780px; margin: 0 auto; }

/* Welcome */
.welcome { text-align: center; padding: 60px 20px; color: var(--text-dim); }
.welcome h2 { color: var(--text); }

/* Quiz start card */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}
.start-header h2 { margin: 0 0 4px; }
.start-header .meta { color: var(--text-dim); font-size: 13.5px; margin-bottom: 20px; }
.start-stats {
  display: flex;
  gap: 16px;
  margin: 20px 0;
  flex-wrap: wrap;
}
.stat-box {
  flex: 1;
  min-width: 120px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.stat-box .num { font-size: 22px; font-weight: 700; }
.stat-box .label { font-size: 12px; color: var(--text-dim); margin-top: 2px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { background: var(--panel); border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--bg); }
.btn-danger { background: transparent; border-color: var(--wrong); color: var(--wrong); }
.btn-danger:hover { background: var(--wrong-bg); }
.btn-row { display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; }

/* Quiz taking */
#quiz-topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}
#quiz-topbar .progress-track {
  flex: 1;
  height: 8px;
  background: var(--border);
  border-radius: 6px;
  overflow: hidden;
}
#quiz-topbar .progress-fill { height: 100%; background: var(--accent); }
#quiz-topbar .progress-label { font-size: 13px; color: var(--text-dim); white-space: nowrap; }

.theme-tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--accent-dark);
  background: rgba(232,135,30,0.12);
  padding: 3px 9px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.q-text { font-size: 18px; font-weight: 600; line-height: 1.4; margin: 0 0 6px; }
.q-instructions { font-size: 14.5px; color: var(--text-dim); margin-bottom: 16px; line-height: 1.5; }
.q-image { margin: 14px 0; }
.q-image img { max-width: 100%; max-height: 280px; border-radius: 8px; border: 1px solid var(--border); display:block; }

.options { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.option {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1.5px solid var(--border);
  border-radius: 9px;
  padding: 12px 14px;
  cursor: pointer;
  background: var(--panel);
  color: var(--text);
  text-align: left;
  font: inherit;
}
.option:disabled { opacity: 1; cursor: default; color: var(--text); }
.option:hover { border-color: var(--accent); }
.option.selected { border-color: var(--accent); background: rgba(232,135,30,0.08); }
.option .opt-key {
  flex: 0 0 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-dim);
}
.option.selected .opt-key { border-color: var(--accent); color: var(--accent-dark); background: #fff2e2; }
.option .opt-text { flex: 1; font-size: 15px; }
.option .opt-img { max-width: 160px; max-height: 110px; border-radius: 6px; }

.option.correct { border-color: var(--correct); background: var(--correct-bg); }
.option.correct .opt-key { border-color: var(--correct); color: var(--correct); background: #fff; }
.option.wrong { border-color: var(--wrong); background: var(--wrong-bg); }
.option.wrong .opt-key { border-color: var(--wrong); color: var(--wrong); background: #fff; }

/* Match question */
.match-items { display: flex; flex-direction: column; gap: 14px; margin-top: 8px; }
.match-item {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1.5px solid var(--border);
  border-radius: 9px;
  padding: 12px 14px;
}
.match-item .m-num {
  flex: 0 0 26px;
  font-weight: 700;
  color: var(--text-dim);
}
.match-item .m-content { flex: 1; min-width: 0; }
.match-item .m-content img { max-width: 160px; max-height: 110px; border-radius: 6px; display:block; }
.match-item select {
  flex: 0 0 auto;
  min-width: 220px;
  max-width: 100%;
  padding: 8px 10px;
  border-radius: 7px;
  border: 1.5px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
}
.match-item.graded.correct { border-color: var(--correct); background: var(--correct-bg); }
.match-item.graded.wrong { border-color: var(--wrong); background: var(--wrong-bg); }
.match-item .m-correct-note { font-size: 12.5px; color: var(--correct); margin-top: 4px; }

/* Nav grid */
#nav-grid-wrap { margin-top: 26px; }
#nav-grid-wrap h4 { font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--text-dim); margin: 0 0 8px; }
#nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(34px, 1fr));
  gap: 6px;
}
.nav-dot {
  height: 34px;
  border-radius: 6px;
  border: 1.5px solid var(--border);
  background: var(--panel);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  cursor: pointer;
}
.nav-dot.current { border-color: var(--accent); color: var(--accent-dark); }
.nav-dot.answered { background: rgba(232,135,30,0.1); color: var(--accent-dark); border-color: rgba(232,135,30,0.4); }
.nav-dot.correct { background: var(--correct-bg); border-color: var(--correct); color: var(--correct); }
.nav-dot.wrong { background: var(--wrong-bg); border-color: var(--wrong); color: var(--wrong); }

/* Result */
.result-hero { text-align: center; padding: 10px 0 20px; }
.result-hero .score-num { font-size: 44px; font-weight: 800; }
.result-hero .score-frac { color: var(--text-dim); font-size: 15px; }
.result-hero .pass-pill {
  display: inline-block;
  margin-top: 10px;
  padding: 5px 16px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 13px;
}
.pass-pill.pass { background: var(--correct-bg); color: var(--correct); }
.pass-pill.fail { background: var(--wrong-bg); color: var(--wrong); }

.theme-breakdown { display: flex; gap: 12px; margin: 20px 0; flex-wrap: wrap; }
.theme-breakdown .tb {
  flex: 1;
  min-width: 160px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}
.theme-breakdown .tb .tb-title { font-size: 12px; color: var(--text-dim); margin-bottom: 6px; }
.theme-breakdown .tb .tb-score { font-weight: 700; }

.review-list { display: flex; flex-direction: column; gap: 18px; margin-top: 24px; }
.review-item { border-top: 1px solid var(--border); padding-top: 16px; }
.review-item .ri-head { display:flex; align-items:center; gap:8px; margin-bottom:6px; }
.review-item .ri-num { font-weight: 700; font-size: 13px; color: var(--text-dim); }
.review-item .ri-status { font-size: 11.5px; font-weight: 700; padding: 2px 8px; border-radius: 20px; }
.review-item .ri-status.correct { background: var(--correct-bg); color: var(--correct); }
.review-item .ri-status.wrong { background: var(--wrong-bg); color: var(--wrong); }

.footer-nav { display: flex; justify-content: space-between; margin-top: 26px; }

/* Flashcard mode */
.flashcard .flashcard-reveal { margin-top: 20px; }
.flashcard.revealed .theme-tag { opacity: 0.85; }

/* Mobile topbar + off-canvas sidebar (hidden on desktop) */
#mobile-topbar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--sidebar-border);
  position: sticky;
  top: 0;
  z-index: 30;
}
#hamburger-btn {
  background: none;
  border: 1px solid var(--sidebar-border);
  color: var(--sidebar-fg-strong);
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: 8px;
  font-size: 17px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
#mobile-topbar .mt-title {
  font-weight: 700;
  color: var(--sidebar-fg-strong);
  font-size: 15px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#sidebar-close-btn {
  display: none;
  background: none;
  border: 1px solid var(--sidebar-border);
  color: var(--sidebar-fg-strong);
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
#sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--overlay);
  z-index: 40;
}

@media (max-width: 900px) {
  #app { flex-direction: column; }
  #mobile-topbar { display: flex; }
  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 84vw;
    max-width: 320px;
    padding: 16px 0;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    z-index: 50;
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.25);
  }
  #sidebar-close-btn { display: flex; }
  #app.sidebar-open #sidebar { transform: translateX(0); }
  #app.sidebar-open #sidebar-backdrop { display: block; }
  #main { padding: 20px 16px 50px; }
  .container { max-width: 100%; }
}

@media (max-width: 480px) {
  #main { padding: 16px 12px 40px; }
  .card { padding: 18px; }
  .start-stats { gap: 10px; }
  .stat-box { min-width: 100px; padding: 12px 14px; }
  .q-text { font-size: 16.5px; }
  .btn { padding: 10px 14px; font-size: 13.5px; }
  .btn-row { flex-direction: column; }
  .btn-row .btn { width: 100%; justify-content: center; }
  .footer-nav { flex-direction: column; gap: 10px; align-items: stretch; }
  .footer-nav > .btn { width: 100%; justify-content: center; }
  .footer-nav .btn-row { flex-direction: row; }
  .footer-nav .btn-row .btn { flex: 1; width: auto; }
  .match-item { flex-wrap: wrap; }
  .match-item select { flex: 1 1 100%; min-width: 0; }
  .result-hero .score-num { font-size: 36px; }
  .theme-breakdown { flex-direction: column; }
}

/* Grammar section */
.grammar-header h2 { margin: 0 0 4px; }
.grammar-header .meta { color: var(--text-dim); font-size: 13.5px; margin-bottom: 4px; }

.grammar-tabs { display: flex; gap: 8px; margin: 18px 0 22px; border-bottom: 1px solid var(--border); }
.grammar-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 4px;
  cursor: pointer;
  margin-right: 14px;
}
.grammar-tab:hover { color: var(--text); }
.grammar-tab.active { color: var(--accent-dark); border-bottom-color: var(--accent); }

.grammar-intro { color: var(--text-dim); line-height: 1.6; margin: 0 0 22px; font-size: 14.5px; }
.grammar-h3 { font-size: 16px; margin: 26px 0 4px; }
.grammar-note { color: var(--text-dim); font-size: 13.5px; line-height: 1.6; margin: 10px 0 0; }
.grammar-cta { margin-top: 28px; }

/* Gender dots / chips */
.gender-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; }
.gender-dot-m { background: var(--gender-m); }
.gender-dot-f { background: var(--gender-f); }
.gender-dot-n { background: var(--gender-n); }
.gender-dot-x { background: var(--gender-x); }

.gender-chip-m, .fc-badge.gender-chip-m { background: var(--gender-m-bg); color: var(--gender-m); }
.gender-chip-f, .fc-badge.gender-chip-f { background: var(--gender-f-bg); color: var(--gender-f); }
.gender-chip-n, .fc-badge.gender-chip-n { background: var(--gender-n-bg); color: var(--gender-n); }
.gender-chip-pl, .fc-badge.gender-chip-pl { background: var(--gender-pl-bg); color: var(--gender-pl); }

/* Rule groups (Der/Die/Das) */
.rule-groups { display: flex; flex-direction: column; gap: 14px; }
.rule-group {
  background: var(--panel);
  border: 1px solid var(--border);
  border-left: 4px solid var(--gender-x);
  border-radius: 9px;
  padding: 14px 16px;
}
.rule-group.gender-border-m { border-left-color: var(--gender-m); }
.rule-group.gender-border-f { border-left-color: var(--gender-f); }
.rule-group.gender-border-n { border-left-color: var(--gender-n); }
.rule-group-header { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.rule-group-title { font-weight: 700; font-size: 14.5px; }
.rule-text { color: var(--text-dim); font-size: 13.5px; line-height: 1.5; }
.rule-examples { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.example-chip { font-size: 12.5px; font-weight: 600; padding: 3px 9px; border-radius: 20px; }

/* Tables */
.grammar-table { width: 100%; border-collapse: collapse; margin: 10px 0 4px; font-size: 14px; }
.grammar-table th, .grammar-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: center;
}
.grammar-table thead th { background: var(--bg); font-size: 12px; text-transform: uppercase; letter-spacing: 0.3px; color: var(--text-dim); }
.grammar-table td.row-label, .grammar-table th:first-child { text-align: left; font-weight: 700; }
.grammar-table th.gender-col-m { color: var(--gender-m); }
.grammar-table th.gender-col-f { color: var(--gender-f); }
.grammar-table th.gender-col-n { color: var(--gender-n); }
.grammar-table th.gender-col-pl { color: var(--gender-pl); }
.grammar-table td { font-weight: 600; }

/* Filter panel */
.filter-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.filter-group-title { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--text-dim); margin-bottom: 6px; }
.filter-chip-group { display: flex; flex-wrap: wrap; gap: 7px; }
.filter-chip {
  border: 1.5px solid var(--border);
  background: var(--panel);
  color: var(--text-dim);
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 20px;
  cursor: pointer;
}
.filter-chip:hover { border-color: var(--accent); color: var(--text); }
.filter-chip.active { border-color: var(--accent); background: rgba(232,135,30,0.1); color: var(--accent-dark); }
.filter-chip-all.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.session-stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.btn-sm { padding: 5px 11px; font-size: 12px; }

/* Flashcard (grammar) */
.flashcard-grammar { text-align: center; padding: 32px 28px; }
.fc-word { font-size: 30px; font-weight: 800; margin-bottom: 22px; }
.fc-gender-btns { display: flex; justify-content: center; gap: 12px; }
.fc-gender-btn {
  min-width: 90px;
  padding: 12px 18px;
  border-radius: 9px;
  border: 1.5px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}
.fc-gender-btn.gender-btn-m:hover { border-color: var(--gender-m); }
.fc-gender-btn.gender-btn-f:hover { border-color: var(--gender-f); }
.fc-gender-btn.gender-btn-n:hover { border-color: var(--gender-n); }
.fc-gender-btn.correct { border-color: var(--correct); background: var(--correct-bg); color: var(--correct); }
.fc-gender-btn.wrong { border-color: var(--wrong); background: var(--wrong-bg); color: var(--wrong); }
.fc-gender-btn:disabled { cursor: default; opacity: 1; }

.fc-badges { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.fc-badge { font-size: 11.5px; font-weight: 700; padding: 3px 10px; border-radius: 20px; background: var(--chip-bg); color: var(--text-dim); }
.fc-sentence { font-size: 19px; font-weight: 600; line-height: 1.5; margin-bottom: 22px; }
.fc-explain { margin: 18px 0; font-size: 14px; }
.fc-explain-answer { font-weight: 700; margin-bottom: 4px; }
.fc-explain-rule { color: var(--text-dim); font-size: 13px; }
.fc-feedback-btns { display: flex; justify-content: center; gap: 10px; margin-top: 6px; }
.fc-feedback-btns .fc-ok:hover { border-color: var(--correct); color: var(--correct); }
.fc-feedback-btns .fc-no:hover { border-color: var(--wrong); color: var(--wrong); }
.fc-result-tag { display: inline-block; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 20px; margin-top: 4px; }
.fc-result-tag.correct { background: var(--correct-bg); color: var(--correct); }
.fc-result-tag.wrong { background: var(--wrong-bg); color: var(--wrong); }
.fc-set-nav { display: flex; justify-content: center; gap: 10px; margin-top: 22px; }

/* Set selector */
.set-selector { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 22px; }
.set-btn {
  border: 1.5px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 9px;
  padding: 10px 6px;
  cursor: pointer;
  text-align: center;
}
.set-btn:hover { border-color: var(--accent); }
.set-btn.active { border-color: var(--accent); background: rgba(232,135,30,0.08); }
.set-btn.set-done { border-color: var(--wrong); }
.set-btn.set-perfect { border-color: var(--correct); }
.set-btn-title { font-size: 13px; font-weight: 700; color: var(--text); }
.set-btn-sub { font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.set-btn-correct { color: var(--correct); font-weight: 700; }
.set-btn-wrong { color: var(--wrong); font-weight: 700; }

/* Remix banner */
.remix-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  background: var(--correct-bg);
  border: 1px solid var(--correct);
  border-radius: 9px;
  padding: 12px 16px;
  margin-bottom: 18px;
}
.remix-text { color: var(--correct); font-weight: 700; font-size: 14px; }

/* Set summary */
.set-summary { text-align: center; }
.set-score-num { font-size: 38px; font-weight: 800; }
.set-score-frac { color: var(--text-dim); font-size: 14px; margin-top: 4px; }
.set-summary .btn-row { justify-content: center; }

/* Card area progress (grammar) */
.gc-progress-label { font-size: 12.5px; color: var(--text-dim); margin-bottom: 10px; }

@media (max-width: 480px) {
  .flashcard-grammar { padding: 24px 16px; }
  .fc-word { font-size: 24px; }
  .fc-sentence { font-size: 16.5px; }
  .fc-gender-btn { min-width: 70px; padding: 10px 12px; font-size: 13.5px; }
  .grammar-table { font-size: 12.5px; }
  .grammar-table th, .grammar-table td { padding: 6px 6px; }
  .set-selector { grid-template-columns: repeat(3, 1fr); }
}