:root {
    --bg: #12151a; --card-bg: #161b22; --card-border: #30363d;
    --text: #e6edf3; --text-muted: #8b949e; --text-dim: #6e7681;
    --accent: #7ee787; --accent-bg: rgba(126,231,135,0.08);
    --blue: #58a6ff; --blue-bg: #1a3a6b;
    --green: #56d364; --green-bg: #0d2818;
    --yellow: #e3b341; --yellow-bg: #2d2000;
    --red: #f85149; --red-bg: #2d0f0f;
    --gold: #ffd700;
    --nav-bg: #161b22; --nav-shadow: rgba(0,0,0,0.3);
    --input-bg: #161b22; --hover-bg: #21262d;
    --subtab-bg: #161b22; --subtab-active: #21262d;
}
body.light {
    --bg: #faf8f5; --card-bg: #ffffff; --card-border: #e8e3dc;
    --text: #2d2a26; --text-muted: #6b6560; --text-dim: #9b9590;
    --accent: #2da44e; --accent-bg: rgba(45,164,78,0.08);
    --blue: #0969da; --blue-bg: #ddf4ff;
    --green: #1a7f37; --green-bg: #dafbe1;
    --yellow: #9a6700; --yellow-bg: #fff8c5;
    --red: #cf222e; --red-bg: #ffebe9;
    --gold: #bf8700;
    --nav-bg: #ffffff; --nav-shadow: rgba(0,0,0,0.08);
    --input-bg: #ffffff; --hover-bg: #f6f2ee;
    --subtab-bg: #f6f2ee; --subtab-active: #ffffff;
}

.logo-bg { fill: #1a1a2e; }
.logo-border { stroke: #333; }
.logo-dark { fill: #e6edf3; }
.logo-red { fill: #f85149; }
body.light .logo-bg { fill: #f8f8f8; }
body.light .logo-border { stroke: #ddd; }
body.light .logo-dark { fill: #1a1a2e; }
body.light .logo-red { fill: #e63946; }

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 70px;
    transition: background 0.3s, color 0.3s;
}
.container { max-width: 640px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.3rem; color: var(--accent); text-align: center; margin-bottom: 2px; }
.subtitle { color: var(--text-dim); font-size: 0.78rem; text-align: center; margin-bottom: 16px; }

/* Bottom Nav */
.bottom-nav {
    position: fixed; bottom: 0; left: 0; right: 0;
    background: var(--nav-bg); border-top: 1px solid var(--card-border);
    display: flex; justify-content: space-around; padding: 10px 0 8px;
    z-index: 100;
    box-shadow: 0 -2px 12px var(--nav-shadow);
}
.nav-item {
    display: flex; flex-direction: column; align-items: center; gap: 3px;
    color: var(--text-dim); font-size: 0.68rem; cursor: pointer; padding: 4px 8px;
    transition: all 0.2s; border-radius: 8px;
}
.nav-item:hover, .nav-item.active { color: var(--accent); background: var(--accent-bg); }
.nav-icon { font-size: 1.3rem; }

/* Panels */
.page { display: none; }
.page.active { display: block; }

/* Sub tabs */
.subtabs { display: flex; gap: 4px; margin-bottom: 16px; background: var(--subtab-bg); border-radius: 12px; padding: 4px; }
.subtab {
    flex: 1; padding: 9px 4px; text-align: center; border-radius: 10px;
    cursor: pointer; font-size: 0.8rem; font-weight: 600; color: var(--text-muted); transition: all 0.2s;
}
.subtab:hover { color: var(--text); }
.subtab.active { background: var(--subtab-active); color: var(--text); box-shadow: 0 2px 6px rgba(0,0,0,0.1); }
.subpanel { display: none; }
.subpanel.active { display: block; }

/* Common */
.card-box {
    background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 14px; padding: 16px; margin-bottom: 12px;
}
.btn-group { display: flex; gap: 6px; flex-wrap: wrap; }
.btn {
    padding: 8px 14px; border: 2px solid var(--card-border); border-radius: 10px;
    background: var(--card-bg); color: var(--text-muted); cursor: pointer;
    font-size: 0.85rem; font-weight: 600; transition: all 0.2s;
}
.btn:hover { border-color: var(--blue); color: var(--text); transform: translateY(-1px); }
.btn.active { border-color: var(--blue); background: var(--blue-bg); color: var(--text); box-shadow: 0 2px 8px rgba(74,158,255,0.15); }
.section-title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); margin-bottom: 8px; }
.result-box {
    background: var(--card-bg); border: 2px solid var(--card-border); border-radius: 14px;
    padding: 20px; text-align: center; min-height: 70px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.result-box.raise { border-color: var(--green); background: var(--green-bg); }
.result-box.call { border-color: var(--yellow); background: var(--yellow-bg); }
.result-box.fold { border-color: var(--red); background: var(--red-bg); }
.result-box.correct { border-color: var(--green); background: var(--green-bg); }
.result-box.wrong { border-color: var(--red); background: var(--red-bg); }
.action-text { font-size: 1.6rem; font-weight: 800; }
.action-text.raise { color: var(--green); }
.action-text.call { color: var(--yellow); }
.action-text.fold { color: var(--red); }
.action-text.correct { color: var(--green); }
.action-text.wrong { color: var(--red); }
.detail-text { color: var(--text-muted); font-size: 0.8rem; margin-top: 4px; }
.reset-btn {
    display: block; margin: 12px auto 0; padding: 8px 20px; border: none; border-radius: 10px;
    background: var(--hover-bg); color: var(--text-muted); cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.reset-btn:hover { background: var(--card-border); color: var(--text); transform: scale(1.02); }
.big-btn {
    width: 100%; padding: 14px; border: 2px solid var(--blue); border-radius: 12px;
    background: var(--card-bg); color: var(--blue); cursor: pointer;
    font-size: 1rem; font-weight: 700; margin-top: 12px; transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(74,158,255,0.1);
}
.big-btn:hover { background: var(--blue-bg); color: var(--text); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(74,158,255,0.2); }
.score-bar {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px;
    padding: 10px 14px; margin-bottom: 12px; font-size: 0.8rem;
}
.score-label { color: var(--text-muted); }
.score-value { font-weight: 700; color: var(--text); }
.streak-text { color: var(--gold); }

/* CLI specific */
.cli-area { font-family: 'SF Mono', 'Fira Code', monospace; }
.prompt-line { display: flex; align-items: center; gap: 8px; }
.prompt-symbol { color: var(--accent); font-weight: bold; }
.cli-input {
    flex: 1; background: none; border: none; outline: none;
    color: var(--text); font-family: inherit; font-size: 1rem; caret-color: var(--accent);
}
.cli-input::placeholder { color: var(--text-dim); }
.help-box { font-size: 0.75rem; color: var(--text-muted); line-height: 1.6; }
.help-box code { background: var(--hover-bg); padding: 2px 5px; border-radius: 3px; color: var(--text); }

/* Cards grid */
.cards-grid { display: grid; grid-template-columns: repeat(13, 1fr); gap: 3px; }
.card-cell {
    aspect-ratio: 0.72; border: 2px solid var(--card-border); border-radius: 4px;
    background: var(--card-bg); cursor: pointer; font-size: 0.7rem; font-weight: 600;
    display: flex; align-items: center; justify-content: center; color: var(--text-muted);
}
.card-cell:hover { border-color: var(--blue); color: var(--text); }
.card-cell.selected { border-color: var(--gold); background: var(--yellow-bg); color: var(--gold); }
.card-cell.red { color: var(--red); }
.card-cell.red.selected { color: var(--gold); }
.suit-row { display: flex; gap: 6px; margin-bottom: 8px; }
.suit-btn {
    padding: 5px 12px; border: 2px solid var(--card-border); border-radius: 6px;
    background: var(--card-bg); cursor: pointer; font-size: 1rem;
}
.suit-btn.active { border-color: var(--blue); background: var(--blue-bg); }
.cards-display { display: flex; gap: 8px; justify-content: center; margin-bottom: 10px; min-height: 60px; align-items: center; }
.card-show {
    width: 44px; height: 62px; border-radius: 8px; background: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; font-weight: 700; border: 2px solid var(--gold);
    box-shadow: 0 3px 8px rgba(255,215,0,0.15);
}
.card-show.red { color: #d32f2f; }
.card-show.black { color: #222; }
.card-show.empty { background: var(--hover-bg); border: 2px dashed var(--text-dim); color: var(--text-dim); font-size: 1.2rem; box-shadow: none; }

/* Quiz buttons */
.quiz-btns { display: flex; gap: 8px; justify-content: center; margin-bottom: 12px; }
.q-btn {
    padding: 12px 22px; border: 2px solid var(--card-border); border-radius: 12px;
    background: var(--card-bg); cursor: pointer; font-size: 1rem; font-weight: 700; min-width: 80px;
    transition: all 0.2s; box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.q-btn:hover { transform: scale(1.05); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.q-btn:active { transform: scale(0.97); }
.q-btn.raise { border-color: var(--green); color: var(--green); }
.q-btn.call { border-color: var(--yellow); color: var(--yellow); }
.q-btn.fold { border-color: var(--red); color: var(--red); }
.q-btn.a-btn { border-color: var(--blue); color: var(--blue); }
.q-btn.b-btn { border-color: #d2a8ff; color: #d2a8ff; }

/* Quiz hand display */
.quiz-card {
    background: var(--card-bg); border: 2px solid var(--card-border); border-radius: 16px;
    padding: 22px; text-align: center; margin-bottom: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.quiz-card .situation { color: var(--text-muted); font-size: 0.8rem; margin-bottom: 6px; }
.quiz-card .position { color: var(--blue); font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.quiz-card .hand { font-size: 2rem; font-weight: 800; letter-spacing: 2px; }
.quiz-card .hand .red { color: var(--red); }
.shortcut-hint { color: var(--text-dim); font-size: 0.7rem; text-align: center; margin-top: 6px; }
.shortcut-hint kbd { background: var(--hover-bg); padding: 2px 5px; border-radius: 3px; color: var(--text-muted); }

/* Feedback area */
.feedback {
    background: var(--card-bg); border: 2px solid var(--card-border); border-radius: 14px;
    padding: 16px; text-align: center; margin-bottom: 12px;
    max-height: 65vh; overflow-y: auto;
}
.feedback.correct { border-color: var(--green); background: var(--green-bg); }
.feedback.wrong { border-color: var(--red); background: var(--red-bg); }

/* Glossary */
.search-input {
    width: 100%; padding: 10px 14px; border: 1px solid var(--card-border); border-radius: 12px;
    background: var(--input-bg); color: var(--text); font-size: 0.9rem; outline: none; margin-bottom: 12px;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(88,166,255,0.1); }
.search-input::placeholder { color: var(--text-dim); }
.term-item {
    border-bottom: 1px solid var(--card-border); padding: 10px 0;
}
.term-name { font-weight: 700; color: var(--accent); margin-bottom: 4px; }
.term-desc { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.term-list { max-height: 60vh; overflow-y: auto; }

/* Pot Odds */
.calc-row { display: flex; gap: 8px; align-items: center; margin-bottom: 10px; }
.calc-label { font-size: 0.8rem; color: var(--text-muted); min-width: 60px; }
.calc-input {
    flex: 1; padding: 8px 12px; border: 1px solid var(--card-border); border-radius: 8px;
    background: var(--input-bg); color: var(--text); font-size: 1rem; outline: none; transition: all 0.2s;
}
.calc-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(88,166,255,0.1); }
.calc-result { text-align: center; font-size: 1.2rem; font-weight: 700; margin-top: 12px; color: var(--accent); }

/* Board display for outs */
.board-cards { display: flex; gap: 6px; justify-content: center; margin: 12px 0; }
.board-card {
    width: 40px; height: 56px; border-radius: 6px; background: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.95rem; font-weight: 700; border: 2px solid var(--card-border);
}
.board-card.red { color: #d32f2f; }
.board-card.black { color: #222; }
.outs-input {
    width: 80px; padding: 10px; border: 2px solid var(--card-border); border-radius: 10px;
    background: var(--input-bg); color: var(--text); font-size: 1.2rem; text-align: center;
    outline: none; margin: 0 auto; display: block; transition: all 0.2s;
}
.outs-input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(88,166,255,0.1); }

/* History */
.history-item { display: flex; justify-content: space-between; padding: 4px 0; font-size: 0.75rem; border-bottom: 1px solid var(--card-border); }
.history-item .cmd { color: var(--text-muted); }
.history-item .act { font-weight: 700; }
.history-item .act.raise { color: var(--green); }
.history-item .act.call { color: var(--yellow); }
.history-item .act.fold { color: var(--red); }

/* Source note */
.source-note {
    font-size: 0.6rem; color: var(--text-dim); text-align: right;
    margin-bottom: 6px; font-style: italic;
}

/* Language toggle & theme toggle */
.lang-toggle, .theme-toggle {
    padding: 5px 12px; border: 1px solid var(--card-border); border-radius: 8px;
    background: var(--card-bg); color: var(--text-muted); cursor: pointer; font-size: 0.7rem; font-weight: 600;
    transition: all 0.2s;
}
.lang-toggle:hover, .theme-toggle:hover { border-color: var(--blue); color: var(--text); }
.theme-toggle { font-size: 1rem; padding: 3px 8px; }

/* Play Simulator */
.sim-table { text-align: center; }
.sim-board { display: flex; justify-content: center; gap: 6px; margin: 12px 0; min-height: 60px; }
.sim-card { width: 40px; height: 56px; border-radius: 8px; background: var(--hover-bg); border: 1px solid var(--card-border); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; font-weight: 700; transition: transform 0.2s; }
.sim-card.red { color: var(--red); }
.sim-card.black { color: var(--text); }
.sim-card.hidden { background: var(--card-border); color: var(--card-border); }
.sim-pot { color: var(--yellow); font-weight: 700; font-size: 1rem; margin: 8px 0; }
.sim-seats { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin: 12px 0; }
.sim-seat { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 12px; padding: 8px; min-width: 70px; font-size: 0.7rem; text-align: center; transition: all 0.2s; }
.sim-seat.active-seat { border-color: var(--accent); box-shadow: 0 0 8px rgba(126,231,135,0.15); }
.sim-seat.folded { opacity: 0.35; }
.sim-seat .seat-pos { color: var(--text-muted); font-size: 0.6rem; }
.sim-seat .seat-stack { color: var(--text); font-weight: 600; }
.sim-seat .seat-action { color: var(--yellow); font-size: 0.65rem; margin-top: 2px; }
.sim-my-cards { display: flex; justify-content: center; gap: 8px; margin: 12px 0; }
.sim-my-cards .sim-card { width: 50px; height: 70px; font-size: 1.1rem; border-color: var(--accent); box-shadow: 0 2px 8px rgba(126,231,135,0.1); }
.sim-actions { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin: 12px 0; }
.sim-actions .act-btn { padding: 10px 16px; border-radius: 10px; border: 2px solid var(--card-border); background: var(--hover-bg); color: var(--text); font-weight: 600; font-size: 0.8rem; cursor: pointer; transition: all 0.2s; }
.sim-actions .act-btn:hover { transform: translateY(-1px); box-shadow: 0 3px 8px rgba(0,0,0,0.1); }
.sim-actions .act-btn.act-fold { border-color: var(--red); color: var(--red); }
.sim-actions .act-btn.act-call { border-color: var(--yellow); color: var(--yellow); }
.sim-actions .act-btn.act-raise { border-color: var(--green); color: var(--green); }
.sim-sizes { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin-top: 6px; }
.sim-sizes .size-btn { padding: 6px 10px; border-radius: 8px; border: 1px solid var(--card-border); background: var(--card-bg); color: var(--text-muted); font-size: 0.7rem; cursor: pointer; transition: all 0.2s; }
.sim-sizes .size-btn:hover { border-color: var(--blue); color: var(--blue); transform: scale(1.03); }

/* Cute illustrations */
.page-mascot { text-align: center; margin-bottom: 8px; }
.page-mascot svg { filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15)); }

@media (max-width: 500px) {
    .container { padding: 10px; }
    .cards-grid { grid-template-columns: repeat(7, 1fr); }
    .quiz-card .hand { font-size: 1.6rem; }
    .q-btn { padding: 12px 16px; min-width: 70px; }
    .card-show { width: 38px; height: 54px; font-size: 0.95rem; }
    #mascot { width: 200px; height: 46px; }
}