:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --surface-3: #f0f2f5;
  --text: #15171a;
  --text-soft: #626873;
  --muted: #8c939e;
  --border: #e5e8ed;
  --border-strong: #d8dde4;
  --accent: #1b5cff;
  --accent-soft: #edf3ff;
  --accent-strong: #0e48d4;
  --success: #178a52;
  --success-soft: #ecf8f1;
  --danger: #d93a4a;
  --danger-soft: #fff0f2;
  --warning: #b76e00;
  --warning-soft: #fff7e7;
  --shadow: 0 18px 50px rgba(23, 27, 35, .07);
  --shadow-soft: 0 8px 24px rgba(23, 27, 35, .05);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --sidebar: 248px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Thai", Tahoma, sans-serif;
}

[data-theme="dark"] {
  --bg: #0f1115;
  --surface: #171a20;
  --surface-2: #1c2027;
  --surface-3: #242a33;
  --text: #f2f4f7;
  --text-soft: #aab1bc;
  --muted: #7e8795;
  --border: #282e37;
  --border-strong: #343c47;
  --accent: #6f9bff;
  --accent-soft: #1b2a4a;
  --accent-strong: #90b0ff;
  --success: #54c98a;
  --success-soft: #163227;
  --danger: #ff7a87;
  --danger-soft: #3a1c22;
  --warning: #eeb558;
  --warning-soft: #3a2c15;
  --shadow: 0 18px 50px rgba(0, 0, 0, .22);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, .18);
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--bg); scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); }
button, textarea, input { font: inherit; }
button { color: inherit; }
button:focus-visible, textarea:focus-visible, input:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 28%, transparent); outline-offset: 2px; }
code, kbd { font-family: "SFMono-Regular", Consolas, monospace; }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.app-shell { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar) minmax(0, 1fr); }
.sidebar { position: fixed; inset: 0 auto 0 0; width: var(--sidebar); padding: 24px 18px; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; z-index: 30; transition: transform .24s ease; }
.brand { display: flex; align-items: center; gap: 12px; padding: 4px 8px 26px; }
.brand-mark { width: 42px; height: 42px; border-radius: 13px; display: grid; place-items: center; background: var(--text); color: var(--surface); font-weight: 800; font-size: 18px; box-shadow: var(--shadow-soft); }
.brand-copy { display: grid; gap: 2px; }
.brand-copy strong { font-size: 16px; letter-spacing: -.02em; }
.brand-copy span { color: var(--muted); font-size: 12px; }
.nav-list { display: grid; gap: 6px; }
.nav-item { border: 0; background: transparent; border-radius: 12px; padding: 12px 13px; display: flex; align-items: center; gap: 12px; color: var(--text-soft); cursor: pointer; text-align: left; transition: background .18s ease, color .18s ease, transform .18s ease; }
.nav-item:hover { background: var(--surface-2); color: var(--text); }
.nav-item.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 700; }
.nav-icon { width: 20px; text-align: center; font-size: 18px; }
.sidebar-foot { margin-top: auto; display: grid; gap: 14px; }
.sidebar-foot > p { margin: 0; color: var(--muted); font-size: 11px; line-height: 1.55; padding: 0 8px; }
.mini-card { border: 1px solid var(--border); background: var(--surface-2); border-radius: 16px; padding: 16px; display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 4px 8px; }
.mini-card .mini-label { grid-column: 1 / -1; font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .09em; }
.mini-card strong { font-size: 24px; letter-spacing: -.04em; }
.mini-card > span:last-child { font-size: 12px; color: var(--muted); }

.main-shell { grid-column: 2; min-width: 0; }
.topbar { min-height: 96px; padding: 20px clamp(20px, 4vw, 52px); display: flex; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(18px); position: sticky; top: 0; z-index: 20; }
.topbar-left, .topbar-actions { display: flex; align-items: center; gap: 14px; }
.eyebrow, .section-kicker { margin: 0 0 5px; color: var(--muted); font-size: 10px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.topbar h1 { margin: 0; font-size: clamp(18px, 2vw, 24px); letter-spacing: -.035em; }
.icon-button, .avatar-button { width: 42px; height: 42px; border: 1px solid var(--border); background: var(--surface); border-radius: 13px; cursor: pointer; display: grid; place-items: center; transition: transform .18s ease, border .18s ease, background .18s ease; }
.icon-button:hover, .avatar-button:hover { transform: translateY(-1px); border-color: var(--border-strong); background: var(--surface-2); }
.avatar-button { background: var(--text); color: var(--surface); border-color: var(--text); font-weight: 800; font-size: 12px; }
.mobile-menu { display: none; }

.screen { display: none; padding: clamp(20px, 3.4vw, 46px); }
.screen.is-active { display: block; animation: fadeIn .22s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl); box-shadow: var(--shadow-soft); }
.dashboard-grid { max-width: 1300px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(300px, .7fr); gap: 22px; align-items: start; }
.hero-card { grid-column: 1 / -1; padding: clamp(24px, 3vw, 38px); display: flex; justify-content: space-between; gap: 30px; align-items: center; overflow: hidden; position: relative; }
.hero-card::after { content: ""; position: absolute; width: 330px; height: 330px; border-radius: 50%; right: -120px; top: -170px; background: radial-gradient(circle, color-mix(in srgb, var(--accent) 18%, transparent), transparent 66%); pointer-events: none; }
.hero-copy { max-width: 670px; position: relative; z-index: 1; }
.hero-copy h2 { margin: 14px 0 10px; font-size: clamp(28px, 4vw, 48px); line-height: 1.08; letter-spacing: -.055em; }
.hero-copy p { margin: 0; color: var(--text-soft); line-height: 1.7; max-width: 610px; }
.pill { display: inline-flex; align-items: center; min-height: 28px; padding: 5px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .04em; }
.pill.subtle { color: var(--text-soft); background: var(--surface-3); }
.hero-stats { display: grid; grid-template-columns: repeat(3, minmax(105px, 1fr)); gap: 10px; position: relative; z-index: 1; }
.stat-tile { min-width: 108px; border: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 90%, transparent); border-radius: 17px; padding: 16px; display: grid; gap: 3px; }
.stat-tile span, .stat-tile small { color: var(--muted); font-size: 11px; }
.stat-tile strong { font-size: 25px; letter-spacing: -.045em; }

.setup-panel { padding: clamp(20px, 2.7vw, 34px); }
.section-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; margin-bottom: 22px; }
.section-heading.compact { margin-bottom: 16px; }
.section-heading h2 { margin: 0; font-size: clamp(22px, 2.2vw, 30px); letter-spacing: -.04em; }
.section-heading p { margin: 8px 0 0; color: var(--text-soft); line-height: 1.6; font-size: 13px; }
.section-heading code { color: var(--accent); }
.inline-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.button { border: 1px solid transparent; border-radius: 12px; min-height: 42px; padding: 10px 15px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; cursor: pointer; font-weight: 750; font-size: 13px; transition: transform .18s ease, background .18s ease, border-color .18s ease, opacity .18s ease; }
.button:hover:not(:disabled) { transform: translateY(-1px); }
.button:disabled { opacity: .42; cursor: not-allowed; }
.button.primary { background: var(--text); color: var(--surface); }
.button.primary:hover:not(:disabled) { background: color-mix(in srgb, var(--text) 90%, var(--accent)); }
.button.ghost { background: var(--surface); border-color: var(--border); color: var(--text-soft); }
.button.ghost:hover:not(:disabled) { border-color: var(--border-strong); color: var(--text); background: var(--surface-2); }
.button.small { min-height: 36px; padding: 8px 11px; font-size: 12px; }
.button.large { min-height: 50px; padding: 13px 19px; }
.text-button { border: 0; background: transparent; color: var(--accent); font-weight: 800; font-size: 12px; cursor: pointer; padding: 6px; }
.danger-text { color: var(--danger) !important; }

.json-editor-wrap { overflow: hidden; border: 1px solid var(--border-strong); border-radius: 16px; background: var(--surface-2); }
.editor-toolbar { height: 42px; padding: 0 14px; display: flex; align-items: center; gap: 9px; border-bottom: 1px solid var(--border); color: var(--text-soft); font-size: 12px; }
.file-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.editor-status { margin-left: auto; color: var(--muted); }
#jsonInput { display: block; width: 100%; min-height: 290px; resize: vertical; border: 0; background: transparent; color: var(--text); padding: 17px 18px; font: 12.5px/1.7 "SFMono-Regular", Consolas, monospace; }
#jsonInput::placeholder { color: var(--muted); opacity: .7; }

.config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 18px; }
.config-card { margin: 0; min-width: 0; border: 1px solid var(--border); border-radius: 16px; padding: 14px; }
.config-card legend { padding: 0 6px; margin-left: 2px; font-weight: 800; font-size: 12px; color: var(--text-soft); }
.choice-row, .switch-row { position: relative; display: flex; align-items: center; gap: 11px; min-height: 58px; padding: 10px; border-radius: 12px; cursor: pointer; }
.choice-row:hover, .switch-row:hover { background: var(--surface-2); }
.choice-row input { position: absolute; opacity: 0; pointer-events: none; }
.radio-ui { flex: 0 0 auto; width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid var(--border-strong); display: grid; place-items: center; }
.choice-row input:checked + .radio-ui { border-color: var(--accent); box-shadow: inset 0 0 0 5px var(--surface), inset 0 0 0 10px var(--accent); }
.choice-row > span:last-child, .switch-row > span:first-child { min-width: 0; display: grid; gap: 3px; }
.choice-row strong, .switch-row strong { font-size: 13px; }
.choice-row small, .switch-row small { color: var(--muted); font-size: 11px; line-height: 1.35; }
.switch-row { justify-content: space-between; }
.switch-row input { position: absolute; opacity: 0; }
.switch-ui { width: 39px; height: 23px; border-radius: 999px; background: var(--surface-3); border: 1px solid var(--border-strong); position: relative; transition: background .18s ease; flex: 0 0 auto; }
.switch-ui::after { content: ""; width: 17px; height: 17px; border-radius: 50%; background: var(--surface); box-shadow: 0 1px 4px rgba(0,0,0,.16); position: absolute; top: 2px; left: 2px; transition: transform .18s ease; }
.switch-row input:checked + .switch-ui { background: var(--accent); border-color: var(--accent); }
.switch-row input:checked + .switch-ui::after { transform: translateX(16px); }

.setup-footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-top: 20px; }
.parse-note { color: var(--muted); font-size: 12px; line-height: 1.5; }
.parse-note.is-error { color: var(--danger); }
.parse-note.is-ok { color: var(--success); }

.recent-panel { padding: 24px; }
.history-list { display: grid; gap: 10px; }
.history-item { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 13px 14px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); }
.history-score { width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; background: var(--surface-2); font-weight: 850; letter-spacing: -.03em; }
.history-score.good { background: var(--success-soft); color: var(--success); }
.history-score.mid { background: var(--warning-soft); color: var(--warning); }
.history-score.low { background: var(--danger-soft); color: var(--danger); }
.history-copy { min-width: 0; }
.history-copy strong { display: block; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.history-copy span { color: var(--muted); font-size: 11px; }
.history-meta { text-align: right; color: var(--text-soft); font-size: 11px; display: grid; gap: 3px; }
.empty-state { min-height: 160px; display: grid; place-items: center; text-align: center; padding: 24px; border: 1px dashed var(--border-strong); border-radius: 14px; color: var(--muted); }
.empty-state strong { display: block; color: var(--text-soft); margin-bottom: 4px; }

.quiz-layout { max-width: 1380px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 20px; align-items: start; }
.quiz-main { min-height: calc(100vh - 165px); display: flex; flex-direction: column; overflow: hidden; }
.quiz-head { padding: 22px 26px; border-bottom: 1px solid var(--border); display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.quiz-meta-line { display: flex; align-items: center; gap: 10px; }
.question-id { color: var(--muted); font-size: 11px; }
.progress-track { width: min(420px, 46vw); max-width: 100%; height: 5px; background: var(--surface-3); border-radius: 999px; overflow: hidden; margin-top: 12px; }
.progress-track > div { height: 100%; width: 0%; background: var(--accent); border-radius: inherit; transition: width .2s ease; }
.quiz-head-actions { display: flex; align-items: center; gap: 8px; }
.timer-chip { height: 36px; padding: 0 11px; display: inline-flex; align-items: center; gap: 7px; border-radius: 11px; background: var(--surface-2); color: var(--text-soft); font-size: 12px; }
.timer-chip strong { color: var(--text); font-variant-numeric: tabular-nums; }
.question-area { width: min(840px, 100%); margin: 0 auto; padding: clamp(32px, 6vw, 76px) clamp(22px, 4vw, 48px); flex: 1; }
.question-area h2 { margin: 8px 0 10px; font-size: clamp(22px, 3.1vw, 36px); letter-spacing: -.04em; line-height: 1.35; white-space: pre-wrap; }
.question-hint { margin: 0 0 28px; color: var(--muted); font-size: 12px; }
.answers-list { display: grid; gap: 11px; }
.answer-button { width: 100%; border: 1px solid var(--border); border-radius: 15px; background: var(--surface); padding: 14px 15px; min-height: 62px; display: flex; align-items: center; gap: 13px; text-align: left; cursor: pointer; transition: transform .16s ease, border-color .16s ease, background .16s ease; }
.answer-button:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--border-strong); background: var(--surface-2); }
.answer-key { flex: 0 0 31px; width: 31px; height: 31px; border-radius: 9px; display: grid; place-items: center; background: var(--surface-2); color: var(--text-soft); font-size: 11px; font-weight: 850; }
.answer-text { line-height: 1.5; font-size: 14px; }
.answer-button.is-selected { border-color: var(--accent); background: var(--accent-soft); }
.answer-button.is-selected .answer-key { background: var(--accent); color: white; }
.answer-button.is-correct { border-color: color-mix(in srgb, var(--success) 58%, var(--border)); background: var(--success-soft); }
.answer-button.is-correct .answer-key { background: var(--success); color: #fff; }
.answer-button.is-wrong { border-color: color-mix(in srgb, var(--danger) 58%, var(--border)); background: var(--danger-soft); }
.answer-button.is-wrong .answer-key { background: var(--danger); color: #fff; }
.answer-button:disabled { cursor: default; }
.feedback-card { margin-top: 18px; border-radius: 14px; padding: 14px; display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; background: var(--surface-2); border: 1px solid var(--border); }
.feedback-card.correct { background: var(--success-soft); border-color: color-mix(in srgb, var(--success) 25%, var(--border)); }
.feedback-card.wrong { background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 25%, var(--border)); }
.feedback-icon { width: 28px; height: 28px; border-radius: 9px; display: grid; place-items: center; background: var(--surface); font-weight: 900; }
.feedback-card strong { display: block; font-size: 13px; margin-bottom: 4px; }
.feedback-card p { margin: 0; color: var(--text-soft); font-size: 12px; line-height: 1.6; white-space: pre-wrap; }
.quiz-footer { padding: 18px 24px; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.quiz-footer-actions { display: flex; align-items: center; gap: 8px; }
.keyboard-hint { color: var(--muted); font-size: 10px; }
kbd { padding: 2px 5px; border: 1px solid var(--border-strong); border-bottom-width: 2px; border-radius: 5px; background: var(--surface-2); color: var(--text-soft); font-size: 9px; }
.quiz-side { padding: 22px; position: sticky; top: 118px; }
.side-summary h3 { margin: 2px 0 18px; font-size: 18px; }
.ring-wrap { display: grid; place-items: center; padding: 4px 0 18px; }
.progress-ring, .score-orb { --progress: 0deg; width: 142px; aspect-ratio: 1; border-radius: 50%; background: conic-gradient(var(--accent) var(--progress), var(--surface-3) 0deg); display: grid; place-items: center; position: relative; }
.progress-ring::before, .score-orb::before { content: ""; position: absolute; inset: 9px; border-radius: 50%; background: var(--surface); }
.progress-ring > div, .score-orb > div { position: relative; z-index: 1; display: grid; place-items: center; gap: 1px; }
.progress-ring strong { font-size: 26px; letter-spacing: -.05em; }
.progress-ring span { color: var(--muted); font-size: 10px; }
.mini-stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.mini-stats-row > div { text-align: center; display: grid; gap: 3px; }
.mini-stats-row span { color: var(--muted); font-size: 9px; }
.mini-stats-row strong { font-size: 16px; }
.navigator-head { display: grid; gap: 5px; padding: 18px 0 12px; }
.navigator-head strong { font-size: 12px; }
.navigator-head span { color: var(--muted); font-size: 9px; display: flex; align-items: center; gap: 5px; }
.legend-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--surface-3); }
.legend-dot.answered { background: var(--accent); }
.legend-dot.current { background: var(--text); }
.question-palette { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.palette-button { aspect-ratio: 1; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); color: var(--text-soft); font-size: 10px; font-weight: 800; cursor: pointer; }
.palette-button:hover { background: var(--surface-2); }
.palette-button.is-answered { background: var(--accent-soft); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 25%, var(--border)); }
.palette-button.is-current { background: var(--text); color: var(--surface); border-color: var(--text); }
.palette-button.is-correct { box-shadow: inset 0 -2px 0 var(--success); }
.palette-button.is-wrong { box-shadow: inset 0 -2px 0 var(--danger); }

.results-wrap { max-width: 920px; margin: 0 auto; }
.result-hero { padding: clamp(30px, 5vw, 56px); text-align: center; display: grid; justify-items: center; }
.result-hero h2 { margin: 8px 0 6px; font-size: clamp(30px, 4vw, 48px); letter-spacing: -.055em; }
.result-hero > p { margin: 0; color: var(--text-soft); }
.score-orb { --score: 0deg; --progress: var(--score); width: 190px; margin: 32px 0; }
.score-orb::before { inset: 12px; }
.score-orb strong { font-size: 42px; letter-spacing: -.06em; }
.score-orb span { color: var(--muted); font-size: 11px; }
.result-metrics { width: 100%; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.result-metrics > div { border: 1px solid var(--border); background: var(--surface-2); border-radius: 14px; padding: 16px 12px; display: grid; gap: 5px; }
.result-metrics span { color: var(--muted); font-size: 10px; }
.result-metrics strong { font-size: 18px; }
.result-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin-top: 28px; }

.review-wrap { max-width: 1100px; margin: 0 auto; }
.review-heading { padding: 8px 0 4px; }
.review-list { display: grid; gap: 14px; }
.review-card { padding: 20px; border-radius: 18px; border: 1px solid var(--border); background: var(--surface); box-shadow: var(--shadow-soft); }
.review-card-head { display: flex; gap: 14px; align-items: flex-start; }
.review-status { flex: 0 0 auto; min-width: 62px; height: 28px; border-radius: 999px; display: grid; place-items: center; padding: 0 10px; font-size: 10px; font-weight: 850; }
.review-status.correct { background: var(--success-soft); color: var(--success); }
.review-status.wrong { background: var(--danger-soft); color: var(--danger); }
.review-status.skipped { background: var(--surface-3); color: var(--muted); }
.review-card h3 { margin: 2px 0 12px; font-size: 16px; line-height: 1.55; white-space: pre-wrap; }
.review-answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.review-answer { border-radius: 12px; padding: 12px; background: var(--surface-2); }
.review-answer span { display: block; color: var(--muted); font-size: 9px; text-transform: uppercase; letter-spacing: .09em; margin-bottom: 5px; }
.review-answer strong { font-size: 12px; line-height: 1.5; }
.review-explanation { margin: 12px 0 0; padding: 12px 14px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; color: var(--text-soft); font-size: 12px; line-height: 1.65; white-space: pre-wrap; }

.history-page { max-width: 1050px; margin: 0 auto; padding: clamp(22px, 3vw, 34px); }
.history-page .history-item { grid-template-columns: auto minmax(0, 1fr) auto auto; }
.history-delete { width: 34px; height: 34px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--muted); cursor: pointer; }
.history-delete:hover { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 28%, var(--border)); }

.toast-region { position: fixed; right: 18px; bottom: 18px; z-index: 100; display: grid; gap: 8px; width: min(360px, calc(100vw - 36px)); }
.toast { background: var(--text); color: var(--surface); border-radius: 13px; padding: 12px 14px; box-shadow: var(--shadow); font-size: 12px; line-height: 1.45; animation: toastIn .2s ease; }
.toast.error { background: var(--danger); color: white; }
@keyframes toastIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ==========================================================================
   Catalog View Styles
   ========================================================================== */
.catalog-wrap { display: grid; gap: 22px; }
.catalog-hero { align-items: center; }
.catalog-header-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.catalog-toolbar-panel { padding: 18px 24px; }
.catalog-toolbar { display: flex; flex-direction: column; gap: 16px; }
.catalog-search-wrap { position: relative; width: 100%; display: flex; align-items: center; }
.catalog-search-icon { position: absolute; left: 14px; color: var(--muted); pointer-events: none; font-size: 14px; }
.catalog-search-input { width: 100%; height: 44px; padding: 0 42px; border-radius: 12px; border: 1px solid var(--border-strong); background: var(--surface-2); color: var(--text); font-size: 13.5px; transition: border-color .16s ease, background-color .16s ease; }
.catalog-search-input:focus { outline: none; border-color: var(--accent); background: var(--surface); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.catalog-search-clear { position: absolute; right: 10px; width: 28px; height: 28px; border-radius: 8px; border: 0; background: transparent; color: var(--muted); cursor: pointer; display: grid; place-items: center; font-size: 14px; }
.catalog-search-clear:hover { background: var(--surface-3); color: var(--text); }
.catalog-categories-wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.catalog-categories-label { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.catalog-categories, .category-pills { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.category-pill { border: 1px solid var(--border); background: var(--surface-2); color: var(--text-soft); border-radius: 999px; padding: 6px 14px; font-size: 12px; font-weight: 700; cursor: pointer; transition: all .16s ease; display: inline-flex; align-items: center; gap: 6px; }
.category-pill:hover { background: var(--surface-3); color: var(--text); border-color: var(--border-strong); }
.category-pill.is-active { background: var(--text); color: var(--surface); border-color: var(--text); }
.category-pill-count { font-size: 10px; opacity: .75; padding: 1px 6px; border-radius: 999px; background: color-mix(in srgb, currentColor 15%, transparent); }

.catalog-grid-panel { padding: clamp(20px, 2.5vw, 32px); }
.catalog-grid-header { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; margin-bottom: 20px; }
.catalog-grid-title { margin: 0; font-size: 19px; font-weight: 800; letter-spacing: -.03em; }
.catalog-grid-sub { font-size: 12px; color: var(--muted); }
.catalog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); gap: 18px; }

.quiz-card { display: flex; flex-direction: column; padding: 22px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface); cursor: pointer; transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; text-align: left; }
.quiz-card:hover { transform: translateY(-3px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.quiz-card:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 30%, transparent); outline-offset: 2px; }
.quiz-card-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 14px; }
.quiz-badge-category, .badge-category { font-size: 11px; font-weight: 750; background: var(--surface-3); color: var(--text-soft); padding: 4px 10px; border-radius: 999px; }
.quiz-badge-count, .badge-count { font-size: 11px; font-weight: 800; background: var(--accent-soft); color: var(--accent); padding: 4px 10px; border-radius: 999px; }
.quiz-card-body { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.quiz-card-title { margin: 0; font-size: 16.5px; font-weight: 800; line-height: 1.4; color: var(--text); letter-spacing: -.02em; }
.quiz-card-desc { margin: 0; font-size: 12.5px; line-height: 1.6; color: var(--text-soft); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.quiz-card-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.mini-pill { font-size: 10px; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.quiz-card-foot { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border); }
.quiz-card-meta { font-size: 11px; color: var(--muted); }
.quiz-card-actions { display: flex; gap: 6px; align-items: center; }

.empty-state-card { grid-column: 1 / -1; padding: 48px 24px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 10px; border: 1.5px dashed var(--border-strong); border-radius: 22px; background: var(--surface-2); }
.empty-icon { font-size: 40px; margin-bottom: 4px; }
.empty-state-card h3 { margin: 0; font-size: 18px; font-weight: 800; color: var(--text); }
.empty-state-card p { margin: 0; font-size: 13px; color: var(--text-soft); max-width: 440px; line-height: 1.55; }
.empty-actions { margin-top: 14px; display: flex; gap: 10px; }
.catalog-loading { grid-column: 1 / -1; padding: 60px 20px; display: flex; flex-direction: column; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }
.spinner { width: 32px; height: 32px; border: 3px solid var(--surface-3); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ==========================================================================
   Modal Dialogs (Preview & Settings)
   ========================================================================== */
.modal-overlay, .modal-backdrop { position: fixed; inset: 0; z-index: 100; background: rgba(10, 13, 18, .55); backdrop-filter: blur(5px); display: flex; align-items: center; justify-content: center; padding: 18px; overflow-y: auto; }
.modal-overlay[hidden], .modal-backdrop[hidden] { display: none !important; }
.modal-card, .modal-sheet { width: min(620px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-xl); box-shadow: var(--shadow); max-height: calc(100vh - 40px); display: flex; flex-direction: column; overflow: hidden; animation: modalPop .2s cubic-bezier(.16, 1, .3, 1); }
@keyframes modalPop { from { opacity: 0; transform: scale(.96) translateY(8px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.modal-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding: 22px 26px 18px; border-bottom: 1px solid var(--border); }
.modal-header-copy { display: grid; gap: 6px; }
.modal-category-pill { width: fit-content; }
.modal-title { margin: 0; font-size: 20px; font-weight: 800; letter-spacing: -.03em; line-height: 1.3; }
.modal-subtitle { margin: 6px 0 0; font-size: 12.5px; color: var(--text-soft); line-height: 1.5; }
.modal-close { font-size: 15px; width: 34px; height: 34px; border-radius: 10px; flex-shrink: 0; }
.modal-body { padding: 22px 26px; overflow-y: auto; flex: 1; display: grid; gap: 16px; }
.modal-description { margin: 0; font-size: 13.5px; line-height: 1.6; color: var(--text-soft); }
.modal-meta-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.modal-count-pill { background: var(--accent-soft); color: var(--accent); font-weight: 800; }
.modal-tags-list { display: flex; flex-wrap: wrap; gap: 6px; }
.modal-tag { font-size: 11px; padding: 3px 8px; border-radius: 6px; background: var(--surface-2); color: var(--text-soft); border: 1px solid var(--border); }
.modal-divider { border: 0; height: 1px; background: var(--border); margin: 4px 0; }
.modal-setup-section, .setup-options { display: grid; gap: 12px; }
.modal-section-title { margin: 0; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.modal-config-grid { display: grid; grid-template-columns: 1fr; gap: 12px; margin-top: 0; }
.modal-footer { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 18px 26px; border-top: 1px solid var(--border); background: var(--surface-2); }
.modal-footer-left { display: flex; gap: 8px; }
.modal-footer-right { display: flex; gap: 8px; }

/* Settings Modal Specifics */
.settings-status-box { padding: 14px 18px; border-radius: 14px; background: var(--surface-2); border: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.status-pill { display: inline-flex; align-items: center; gap: 7px; padding: 5px 13px; border-radius: 999px; font-size: 11.5px; font-weight: 750; }
.status-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; }
.status-pill.connected { background: var(--success-soft); color: var(--success); }
.status-pill.connected::before { background: var(--success); box-shadow: 0 0 0 2px color-mix(in srgb, var(--success) 35%, transparent); }
.status-pill.local { background: var(--warning-soft); color: var(--warning); }
.status-pill.local::before { background: var(--warning); }
.status-pill.error { background: var(--danger-soft); color: var(--danger); }
.status-pill.error::before { background: var(--danger); }

/* Form Elements */
.form-group { display: grid; gap: 6px; margin-bottom: 14px; }
.form-label, .form-group label { font-size: 12px; font-weight: 750; color: var(--text); }
.form-input, .form-textarea, .form-select { width: 100%; border: 1px solid var(--border-strong); background: var(--surface); color: var(--text); border-radius: 12px; padding: 10px 14px; font-size: 13px; transition: border-color .16s ease, box-shadow .16s ease; box-sizing: border-box; }
.form-input:focus, .form-textarea:focus, .form-select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }
.form-textarea { resize: vertical; line-height: 1.6; }
.form-hint { font-size: 11px; color: var(--muted); line-height: 1.4; }
.required-star { color: var(--danger); font-weight: 800; }

/* ==========================================================================
   Hybrid Quiz Editor Styles
   ========================================================================== */
.editor-wrap { display: grid; grid-template-columns: 1fr; gap: 20px; max-width: 1200px; margin: 0 auto; }
.editor-header { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.editor-header-info { max-width: 600px; }
.editor-header-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.button.accent { background: var(--accent); color: white; border-color: var(--accent); }
.button.accent:hover:not(:disabled) { background: var(--accent-strong); border-color: var(--accent-strong); }

.editor-metadata-panel { padding: clamp(20px, 2.5vw, 28px); }
.editor-metadata-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.form-group-title, .form-group-desc { grid-column: 1 / -1; }

.editor-tabs-section { padding: clamp(20px, 2.5vw, 28px); }
.tabs-nav, .editor-tabs { display: flex; gap: 8px; margin-bottom: 22px; border-bottom: 1px solid var(--border); padding-bottom: 14px; }
.editor-tab-panel { display: none; }
.editor-tab-panel.is-active { display: block; }
.editor-tab-panel[hidden] { display: none !important; }

/* Visual Form */
.visual-panel-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.visual-panel-info strong { font-size: 14px; font-weight: 750; }
.questions-list { display: grid; gap: 18px; }
.editor-question-card, .question-card { border: 1px solid var(--border); border-radius: 18px; background: var(--surface-2); padding: 22px; display: grid; gap: 14px; transition: border-color .16s ease; }
.editor-question-card:hover, .question-card:hover { border-color: var(--border-strong); }
.question-card-header { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.question-card-title-wrap { display: flex; align-items: center; gap: 10px; }
.question-index-pill { font-size: 11px; font-weight: 800; }
.question-id-subtle { font-size: 11px; color: var(--muted); }
.question-card-actions { display: flex; align-items: center; gap: 6px; }
.icon-button.small { width: 32px; height: 32px; border-radius: 9px; font-size: 12px; }
.question-text-input { min-height: 72px; resize: vertical; }
.form-group-type { max-width: 320px; }

.options-section { display: grid; gap: 10px; margin-top: 6px; }
.options-section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.options-section-head label { font-size: 12.5px; font-weight: 750; }
.options-list { display: grid; gap: 8px; }
.option-row { display: flex; align-items: center; gap: 10px; padding: 6px 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); transition: all .16s ease; }
.option-row.is-correct-row { border-color: color-mix(in srgb, var(--success) 45%, var(--border)); background: var(--success-soft); }
.option-check-wrap { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; cursor: pointer; flex: 0 0 auto; position: relative; }
.option-check-wrap input { position: absolute; opacity: 0; pointer-events: none; }
.checkbox-ui { width: 18px; height: 18px; border-radius: 5px; border: 1.5px solid var(--border-strong); display: grid; place-items: center; transition: all .16s ease; }
.option-check-wrap input:checked + .checkbox-ui { background: var(--success); border-color: var(--success); box-shadow: inset 0 0 0 3px var(--surface); }
.option-check-wrap input:checked + .radio-ui { border-color: var(--success); box-shadow: inset 0 0 0 5px var(--surface), inset 0 0 0 10px var(--success); }
.option-text-input { flex: 1; border: 0 !important; background: transparent !important; padding: 8px 6px !important; font-size: 13px; }
.option-text-input:focus { outline: none !important; box-shadow: none !important; }
.btn-delete-option { width: 28px; height: 28px; border-radius: 8px; border: 0; background: transparent; font-size: 13px; flex-shrink: 0; }
.btn-delete-option:hover:not(:disabled) { background: var(--danger-soft); color: var(--danger); }
.visual-panel-footer { margin-top: 20px; text-align: center; }
.visual-panel-footer .button { width: 100%; border: 1.5px dashed var(--border-strong); min-height: 46px; }

/* JSON Editor Mode */
.json-panel-toolbar { height: 48px; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--border); background: var(--surface-2); border-radius: 14px 14px 0 0; }
.editor-diagnostics, .diagnostics-box { padding: 12px 16px; border-radius: 12px; display: flex; align-items: center; gap: 10px; font-size: 12.5px; margin-bottom: 14px; font-weight: 650; }
.diagnostics-icon { font-size: 15px; }
.diagnostics-idle { background: var(--surface-2); border: 1px solid var(--border); color: var(--text-soft); }
.diagnostics-valid { background: var(--success-soft); border: 1px solid color-mix(in srgb, var(--success) 35%, var(--border)); color: var(--success); }
.diagnostics-syntax-error, .diagnostics-schema-error { background: var(--danger-soft); border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border)); color: var(--danger); }
.editor-wrap .json-editor-wrap { display: flex; border: 1px solid var(--border-strong); border-radius: 14px; background: var(--surface-2); overflow: hidden; }
.json-editor-gutter { flex: 0 0 46px; padding: 16px 8px; background: var(--surface-3); color: var(--muted); font: 12.5px/1.7 "SFMono-Regular", Consolas, monospace; text-align: right; user-select: none; border-right: 1px solid var(--border); overflow: hidden; }
.editor-json-textarea { flex: 1; min-height: 420px; resize: vertical; border: 0; background: transparent; color: var(--text); padding: 16px 18px; font: 12.5px/1.7 "SFMono-Regular", Consolas, monospace; }
.editor-json-textarea:focus { outline: none; }

@media (max-width: 1050px) {
  :root { --sidebar: 218px; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .recent-panel { grid-column: 1; }
  .quiz-layout { grid-template-columns: 1fr; }
  .quiz-side { position: static; }
  .question-palette { grid-template-columns: repeat(10, 1fr); }
}

@media (max-width: 820px) {
  .app-shell { display: block; }
  .main-shell { grid-column: auto; }
  .sidebar { width: min(82vw, 300px); transform: translateX(-102%); box-shadow: var(--shadow); }
  .sidebar.is-open { transform: translateX(0); }
  .mobile-overlay { position: fixed; inset: 0; z-index: 25; background: rgba(0,0,0,.33); backdrop-filter: blur(2px); }
  .mobile-overlay:not([hidden]) { display: block; }
  .mobile-menu { display: grid; }
  .topbar { min-height: 80px; padding: 14px 18px; }
  .topbar .eyebrow { display: none; }
  .screen { padding: 18px; }
  .hero-card { align-items: flex-start; flex-direction: column; }
  .hero-stats { width: 100%; }
  .config-grid { grid-template-columns: 1fr; }
  .quiz-main { min-height: auto; }
  .quiz-head { padding: 18px; flex-direction: column; }
  .quiz-head-actions { width: 100%; justify-content: space-between; }
  .progress-track { width: 100%; }
  .quiz-footer { align-items: stretch; flex-direction: column; }
  .keyboard-hint { display: none; }
  .quiz-footer-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .quiz-footer-actions .button:first-child { grid-column: 1 / -1; }
  .question-palette { grid-template-columns: repeat(8, 1fr); }
  .result-metrics { grid-template-columns: 1fr 1fr; }
  .editor-metadata-grid { grid-template-columns: 1fr; }
  .editor-header { flex-direction: column; align-items: stretch; }
  .editor-header-actions { width: 100%; }
  .modal-card, .modal-sheet { width: 100%; max-height: calc(100vh - 20px); border-radius: var(--radius-lg); }
  .catalog-toolbar { flex-direction: column; align-items: stretch; }
}

@media (max-width: 560px) {
  .topbar h1 { font-size: 17px; }
  .avatar-button { display: none; }
  .screen { padding: 12px; }
  .panel { border-radius: 20px; }
  .hero-card { padding: 22px; }
  .hero-copy h2 { font-size: 31px; }
  .hero-stats { grid-template-columns: 1fr 1fr 1fr; gap: 7px; }
  .stat-tile { min-width: 0; padding: 12px 10px; }
  .stat-tile strong { font-size: 20px; }
  .stat-tile span, .stat-tile small { font-size: 9px; }
  .setup-panel, .recent-panel { padding: 18px; }
  .section-heading { flex-direction: column; }
  .section-heading .inline-actions { width: 100%; }
  .section-heading .inline-actions .button { flex: 1; }
  #jsonInput { min-height: 250px; }
  .setup-footer { align-items: stretch; flex-direction: column; }
  .setup-footer .button { width: 100%; }
  .history-item, .history-page .history-item { grid-template-columns: auto minmax(0, 1fr); }
  .history-meta, .history-delete { grid-column: 2; text-align: left; }
  .quiz-head-actions .button { font-size: 11px; }
  .question-area { padding: 28px 18px; }
  .question-area h2 { font-size: 23px; }
  .answer-button { padding: 12px; }
  .quiz-footer { padding: 14px; }
  .quiz-footer-actions { grid-template-columns: 1fr 1fr; }
  .quiz-side { padding: 18px; }
  .question-palette { grid-template-columns: repeat(6, 1fr); }
  .result-hero { padding: 28px 18px; }
  .score-orb { width: 165px; }
  .result-actions { width: 100%; flex-direction: column; }
  .result-actions .button { width: 100%; }
  .review-answer-grid { grid-template-columns: 1fr; }
  .catalog-grid { grid-template-columns: 1fr; }
  .quiz-card-foot { flex-direction: column; align-items: stretch; gap: 10px; }
  .quiz-card-actions { width: 100%; justify-content: space-between; }
  .quiz-card-actions .button { flex: 1; }
  .modal-footer { flex-direction: column-reverse; align-items: stretch; }
  .modal-footer-left, .modal-footer-right { width: 100%; }
  .modal-footer .button { width: 100%; }
  .question-card { padding: 16px; }
  .option-row { padding: 4px 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}