/* Card 21 — GameCMB
   Modern premium card-table aesthetic: deep emerald/navy gradient,
   glassmorphism panels, HTML/CSS-rendered playing cards (no external
   card art), gold accent for the "21" identity. Deliberately avoids
   any casino/gambling iconography (chips, dice, currency, roulette) —
   this is a skill/score game, not a betting game.
*/

:root {
    --bg-1: #06231c;
    --bg-2: #0b3b2e;
    --bg-3: #0e2a4a;
    --panel: rgba(255, 255, 255, 0.06);
    --panel-border: rgba(255, 255, 255, 0.12);
    --gold: #ffd76a;
    --gold-soft: #ffe9a8;
    --text: #f3f7f4;
    --text-dim: rgba(243, 247, 244, 0.68);
    --danger: #ff5d5d;
    --safe: #7ef7c9;
    --card-face: #fdfdfb;
    --card-red: #d63447;
    --card-black: #1c2430;
    --radius-lg: 22px;
    --radius-md: 14px;
    --radius-sm: 8px;
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.45);
    --font: 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: radial-gradient(120% 120% at 50% -10%, var(--bg-3) 0%, var(--bg-2) 45%, var(--bg-1) 100%);
    color: var(--text);
    font-family: var(--font);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

[hidden] { display: none !important; }

a { color: var(--gold); }

button {
    font-family: inherit;
    cursor: pointer;
}

img { max-width: 100%; }

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ---------------------------------------------------------------- */
/* Top bar                                                           */
/* ---------------------------------------------------------------- */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    max-width: 720px;
    margin: 0 auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    letter-spacing: 0.02em;
    font-size: 18px;
    color: var(--gold);
    text-decoration: none;
}

.brand-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: linear-gradient(145deg, var(--gold), #c98f2a);
    color: #17130a;
    font-size: 14px;
    font-weight: 900;
}

.icon-btn {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    color: var(--text);
    border-radius: 999px;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.icon-btn:active { transform: scale(0.94); }

/* ---------------------------------------------------------------- */
/* Game shell / stage                                                */
/* ---------------------------------------------------------------- */
.stage {
    position: relative;
    max-width: 560px;
    margin: 8px auto 24px;
    padding: 0 20px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(14px);
    padding: 28px 22px;
    position: relative;
    overflow: hidden;
}

.screen { transition: opacity 0.2s ease; }

/* ---- Start screen ---- */
.start-title {
    text-align: center;
    font-size: 44px;
    font-weight: 900;
    letter-spacing: 0.01em;
    margin: 4px 0 6px;
    background: linear-gradient(180deg, var(--gold-soft), var(--gold));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 8px 30px rgba(255, 215, 106, 0.25);
}

.start-sub {
    text-align: center;
    color: var(--text-dim);
    font-size: 15px;
    margin-bottom: 22px;
    letter-spacing: 0.02em;
}

.best-row {
    display: flex;
    gap: 12px;
    margin-bottom: 22px;
}

.best-tile {
    flex: 1;
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
    padding: 12px 10px;
    text-align: center;
}

.best-tile .label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

.best-tile .value {
    font-size: 22px;
    font-weight: 800;
    color: var(--gold);
    margin-top: 2px;
}

.streak-pill {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 18px;
}

.streak-pill b { color: var(--safe); }

.btn {
    display: block;
    width: 100%;
    border: none;
    border-radius: 999px;
    padding: 17px 20px;
    font-size: 17px;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-align: center;
    transition: transform 0.08s ease, filter 0.15s ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: linear-gradient(145deg, var(--gold-soft), var(--gold) 55%, #d9a53a);
    color: #1a1305;
    box-shadow: 0 10px 30px rgba(255, 215, 106, 0.35);
}

.btn-primary:hover { filter: brightness(1.05); }

.btn-ghost {
    background: transparent;
    border: 1px solid var(--panel-border);
    color: var(--text);
    margin-top: 12px;
}

.btn-danger-outline {
    background: transparent;
    border: 1px solid rgba(255, 93, 93, 0.4);
    color: var(--danger);
}

.btn:disabled {
    opacity: 0.45;
    pointer-events: none;
}

.action-row {
    display: flex;
    gap: 12px;
}

.action-row .btn { flex: 1; }

/* ---- Gameplay screen ---- */

/* Persistent session HUD: which round, and the running banked total —
   the whole point of the push-your-luck loop is keeping this visible
   at all times so the player always feels what's at stake. */
.session-hud {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
    padding: 10px 14px;
    background: rgba(0, 0, 0, 0.22);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
}

.session-hud-round {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

.session-hud-banked {
    font-size: 16px;
    font-weight: 900;
    letter-spacing: 0.02em;
    color: var(--gold);
}

/* "+N banked!" toast, shown briefly over the card table between rounds
   (on STAND, or a HIT that lands Perfect 21). */
.bank-toast {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.85);
    z-index: 10;
    background: rgba(8, 26, 21, 0.92);
    border: 1px solid rgba(255, 215, 106, 0.5);
    color: var(--gold);
    font-weight: 900;
    font-size: 17px;
    letter-spacing: 0.02em;
    padding: 10px 20px;
    border-radius: 999px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.bank-toast.show {
    animation: bankToastPop 1.5s cubic-bezier(.2, .9, .3, 1) both;
}

@keyframes bankToastPop {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    15% { opacity: 1; transform: translate(-50%, -50%) scale(1.05); }
    25% { transform: translate(-50%, -50%) scale(1); }
    75% { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, -60%) scale(0.96); }
}

.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    min-height: 22px;
}

.hud-best {
    font-size: 12px;
    color: var(--text-dim);
}

.hud-best b { color: var(--gold); }

.combo-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 800;
    color: var(--safe);
    background: rgba(126, 247, 201, 0.12);
    border: 1px solid rgba(126, 247, 201, 0.3);
    border-radius: 999px;
    padding: 4px 10px;
    opacity: 0;
    transform: translateY(-4px) scale(0.9);
    transition: all 0.25s ease;
}

.combo-badge.show {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.combo-badge.pulse { animation: comboPulse 0.4s ease; }

@keyframes comboPulse {
    0% { transform: scale(1); }
    40% { transform: scale(1.18); }
    100% { transform: scale(1); }
}

.card-table {
    position: relative;
    min-height: 150px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#particle-canvas {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.card-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    perspective: 800px;
}

.card {
    width: 64px;
    height: 92px;
    background: var(--card-face);
    border-radius: 10px;
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.35);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 6px 7px;
    color: var(--card-black);
    font-weight: 800;
    animation: cardDeal 0.38s cubic-bezier(.2, .9, .3, 1.2) both;
}

.card.red { color: var(--card-red); }

.card .corner {
    font-size: 15px;
    line-height: 1;
}

.card .corner.bottom {
    align-self: flex-end;
    transform: rotate(180deg);
}

.card .pip {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    opacity: 0.92;
}

@keyframes cardDeal {
    0% { opacity: 0; transform: translateY(-40px) scale(0.6) rotate(-8deg); }
    70% { opacity: 1; }
    100% { opacity: 1; transform: translateY(0) scale(1) rotate(0deg); }
}

.card.new-card { animation: cardDeal 0.42s cubic-bezier(.2, .9, .3, 1.2) both; }

.total-wrap {
    text-align: center;
    margin-top: 18px;
}

.total-label {
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.total-value {
    font-size: 46px;
    font-weight: 900;
    color: var(--text);
    line-height: 1.1;
    transition: color 0.2s ease;
}

.total-value.risk { color: var(--gold); }
.total-value.danger { color: var(--danger); }

.risk-prompt {
    margin-top: 6px;
    font-size: 13px;
    font-weight: 700;
    color: var(--gold);
    letter-spacing: 0.04em;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.risk-prompt.show { opacity: 1; }

.stage.shake { animation: stageShake 0.35s ease; }

@keyframes stageShake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-8px); }
    40% { transform: translateX(7px); }
    60% { transform: translateX(-5px); }
    80% { transform: translateX(3px); }
}

.flash-overlay {
    position: fixed;
    inset: 0;
    background: var(--danger);
    opacity: 0;
    pointer-events: none;
    z-index: 40;
}

.flash-overlay.flash { animation: flashRed 0.35s ease; }

@keyframes flashRed {
    0% { opacity: 0.35; }
    100% { opacity: 0; }
}

.glow-pulse { animation: glowPulse 0.9s ease; }

@keyframes glowPulse {
    0% { box-shadow: 0 0 0 rgba(255, 215, 106, 0); }
    30% { box-shadow: 0 0 60px rgba(255, 215, 106, 0.55); }
    100% { box-shadow: 0 0 0 rgba(255, 215, 106, 0); }
}

.action-buttons {
    margin-top: 22px;
    display: flex;
    gap: 12px;
}

.btn-hit {
    flex: 1;
    background: linear-gradient(145deg, #8ad7ff, #4fa9e6);
    color: #062033;
    border: none;
    border-radius: 999px;
    padding: 16px;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.btn-stand {
    flex: 1;
    background: linear-gradient(145deg, #ffb26b, #e8823a);
    color: #2a1200;
    border: none;
    border-radius: 999px;
    padding: 16px;
    font-size: 16px;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.btn-hit:active, .btn-stand:active { transform: scale(0.96); }
.btn-hit:disabled, .btn-stand:disabled { opacity: 0.4; pointer-events: none; }

/* ---- Result screen ---- */
.result-emoji {
    text-align: center;
    font-size: 46px;
    margin-bottom: 2px;
}

.result-title {
    text-align: center;
    font-size: 26px;
    font-weight: 900;
    margin-bottom: 4px;
}

.result-title.win { color: var(--gold); }
.result-title.bust { color: var(--danger); }
.result-title.stand { color: var(--safe); }

.result-sub {
    text-align: center;
    color: var(--text-dim);
    font-size: 14px;
    margin-bottom: 6px;
}

.result-stats {
    text-align: center;
    color: var(--safe);
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 20px;
}

.score-row {
    display: flex;
    gap: 12px;
    margin-bottom: 18px;
}

.score-tile {
    flex: 1;
    text-align: center;
    background: rgba(0, 0, 0, 0.18);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-md);
    padding: 14px 10px;
}

.score-tile .label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

.score-tile .value {
    font-size: 26px;
    font-weight: 900;
    color: var(--text);
    margin-top: 2px;
}

.score-tile.highlight .value { color: var(--gold); }

.rank-badge {
    text-align: center;
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 16px;
}

.rank-badge b { color: var(--gold); }

.new-best-banner {
    text-align: center;
    background: rgba(255, 215, 106, 0.12);
    border: 1px solid rgba(255, 215, 106, 0.4);
    color: var(--gold);
    border-radius: var(--radius-md);
    padding: 10px;
    font-weight: 800;
    font-size: 14px;
    margin-bottom: 16px;
    animation: glowPulse 1.1s ease;
}

.nickname-form {
    margin-top: 4px;
    margin-bottom: 6px;
}

.nickname-form label {
    display: block;
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.nickname-form input {
    width: 100%;
    padding: 14px 14px;
    font-size: 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--panel-border);
    background: rgba(0, 0, 0, 0.25);
    color: var(--text);
    margin-bottom: 10px;
}

.nickname-form input:focus {
    outline: none;
    border-color: var(--gold);
}

.form-error {
    color: var(--danger);
    font-size: 12.5px;
    margin: -4px 0 10px;
    min-height: 1em;
}

.form-success {
    color: var(--safe);
    font-size: 13px;
    text-align: center;
    margin: 6px 0 14px;
}

/* ---------------------------------------------------------------- */
/* Modal (Leaderboard)                                               */
/* ---------------------------------------------------------------- */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(3, 10, 8, 0.72);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: 50;
    backdrop-filter: blur(4px);
}

@media (min-width: 560px) {
    .modal-backdrop { align-items: center; }
}

.modal {
    width: 100%;
    max-width: 480px;
    max-height: 82vh;
    overflow-y: auto;
    background: linear-gradient(180deg, #103b30, #08201a);
    border: 1px solid var(--panel-border);
    border-radius: 20px 20px 0 0;
    padding: 20px;
}

@media (min-width: 560px) {
    .modal { border-radius: 20px; }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.modal-header h2 {
    margin: 0;
    font-size: 18px;
    color: var(--gold);
}

.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.tab-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    color: var(--text-dim);
    border-radius: 999px;
    padding: 9px 6px;
    font-size: 13px;
    font-weight: 700;
}

.tab-btn.active {
    background: var(--gold);
    color: #1a1305;
    border-color: var(--gold);
}

.lb-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 8px;
    border-radius: var(--radius-sm);
}

.lb-row:nth-child(odd) { background: rgba(255, 255, 255, 0.03); }

.lb-rank {
    width: 28px;
    text-align: center;
    font-weight: 800;
    color: var(--text-dim);
}

.lb-row.top1 .lb-rank, .lb-row.top1 .lb-name { color: var(--gold); }
.lb-row.top2 .lb-rank { color: #d7dee6; }
.lb-row.top3 .lb-rank { color: #d6a06a; }

.lb-name {
    flex: 1;
    font-weight: 700;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lb-score { font-weight: 800; }

.lb-empty {
    text-align: center;
    color: var(--text-dim);
    padding: 30px 10px;
    font-size: 14px;
}

/* ---------------------------------------------------------------- */
/* Below-the-fold SEO content                                       */
/* ---------------------------------------------------------------- */
.seo-content {
    max-width: 720px;
    margin: 40px auto 0;
    padding: 0 20px 60px;
    color: var(--text-dim);
    line-height: 1.7;
}

.seo-content h2 {
    color: var(--text);
    font-size: 21px;
    margin: 34px 0 12px;
}

.seo-content h2:first-child { margin-top: 0; }

.seo-content p { margin: 0 0 12px; }

.seo-content ul { margin: 0 0 12px; padding-left: 20px; }
.seo-content li { margin-bottom: 6px; }

.faq-item {
    border-top: 1px solid var(--panel-border);
    padding: 14px 0;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 700;
    color: var(--text);
}

.related-games {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
}

.related-games a {
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    padding: 8px 14px;
    font-size: 13px;
    text-decoration: none;
    color: var(--text);
}

.related-games a:hover { border-color: var(--gold); }

/* ---------------------------------------------------------------- */
/* Ad slots                                                          */
/* ---------------------------------------------------------------- */
.ad-slot {
    max-width: 720px;
    margin: 18px auto;
    padding: 0 20px;
    text-align: center;
    color: var(--text-dim);
    font-size: 11px;
}

.ad-slot .ad-box {
    min-height: 90px;
    border: 1px dashed var(--panel-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

footer.site-footer {
    text-align: center;
    color: var(--text-dim);
    font-size: 12px;
    padding: 20px;
}

footer.site-footer a { color: var(--text-dim); }

@media (max-width: 400px) {
    .card { width: 54px; height: 78px; }
    .card .pip { font-size: 24px; }
    .start-title { font-size: 36px; }
    .total-value { font-size: 38px; }
}