/* ── Dark Theme: CSS Variables ───────────────────────────────────── */
[data-theme="dark"] {
    --bg-body: #2c3a47;
    --bg-app: #344252;
    --bg-toolbar: #2c3a47;
    --bg-status: #283440;
    --bg-board: #253040;
    --bg-footer: #2c3a47;
    --bg-cell: #344252;
    --bg-cell-hover: #3d4f63;
    --bg-input: #253040;
    --bg-btn-pencil: #253040;
    --bg-move-card: #253040;

    --text-primary: #f0f4f8;
    --text-muted: #8a9bb0;
    --text-faint: #5a6a7a;

    --border-main: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.07);
    --border-input: rgba(255, 255, 255, 0.12);
    --border-cell: rgba(255, 255, 255, 0.08);

    --accent: #344252;
    --accent-dark: #1e2a36;
    --accent-mid: #3d4f63;

    --board-border: rgba(255, 255, 255, 0.25);
    --board-shadow: rgba(0, 0, 0, 0.4);

    --select-bg: rgba(255, 255, 255, 0.12);
    --select-border: rgba(255, 255, 255, 0.6);
    --select-text: #f0f4f8;

    --invalid-bg: rgba(180, 60, 60, 0.2);
    --invalid-text: #ff8888;
    --correct-bg: rgba(60, 160, 60, 0.15);
    --correct-text: #88dd88;
    --hint-bg: rgba(180, 140, 40, 0.15);
    --hint-text: #ddbb66;

    --note-color: rgba(255, 255, 255, 0.25);
    --note-active: rgba(255, 255, 255, 0.75);

    --lb-gold: #f0c040;
    --lb-silver: #b0b8c8;
    --lb-bronze: #c87840;

    --font-modern: "Poppins", "Inter", "Helvetica Neue", system-ui, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --cage-border: rgba(255, 255, 255, 0.5);
    --user-input-color: #ffffff;
    --btn-primary-bg: rgba(255, 255, 255, 0.9);
    --btn-primary-color: #1e2a36;
    --btn-primary-bg-hover: #ffffff;
    --btn-disabled-bg: rgba(255, 255, 255, 0.2);
    --btn-disabled-color: rgba(255, 255, 255, 0.4);
    --btn-ghost-color: rgba(255, 255, 255, 0.7);
    --btn-ghost-border: rgba(255, 255, 255, 0.18);
    --btn-ghost-bg-hover: rgba(255, 255, 255, 0.08);
    --btn-active-bg: rgba(255, 255, 255, 0.12);
    --btn-active-color: #ffffff;
    --btn-active-border: rgba(255, 255, 255, 0.4);
    --win-gold: #ffd164;
    --win-gold-hover: #ffc933;
}

/* ── Global font ─────────────────────────────────────────────────── */
[data-theme="dark"] * {
    font-family: "Poppins", system-ui, sans-serif;
}
[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    font-family: "Poppins", system-ui, sans-serif !important;
}

/* ── Header ──────────────────────────────────────────────────────── */
[data-theme="dark"] header {
    background: var(--accent-dark);
    border-bottom: 1px solid var(--border-cell);
    font-family: var(--font-modern);
}
[data-theme="dark"] header h1 {
    font-family: var(--font-modern);
    font-weight: 500;
    letter-spacing: 6px;
    font-size: 2em;
    text-transform: lowercase;
}
[data-theme="dark"] .subtitle {
    font-family: var(--font-modern);
    font-weight: 500;
    letter-spacing: 3px;
    opacity: 0.35;
    font-size: 0.65em;
    text-transform: lowercase;
}

/* ── Toolbar ─────────────────────────────────────────────────────── */
[data-theme="dark"] .toolbar {
    border-bottom: 1px solid var(--border-light);
    border-radius: 0;
}
[data-theme="dark"] .toolbar-sep-vertical,
[data-theme="dark"] .toolbar-sep,
[data-theme="dark"] .toolbar-sep-main {
    background: var(--border-light);
}

/* ── Buttons ─────────────────────────────────────────────────────── */
[data-theme="dark"] .btn {
    border-radius: var(--radius-sm);
    font-family: var(--font-modern);
    font-weight: 500;
    letter-spacing: 0.3px;
}
[data-theme="dark"] .btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-color);
    border-color: transparent;
    border-radius: var(--radius-sm);
    font-weight: 600;
}
[data-theme="dark"] .btn-primary:hover {
    background: var(--btn-primary-bg-hover);
}
[data-theme="dark"] .btn-primary:disabled {
    background: var(--btn-disabled-bg);
    color: var(--btn-disabled-color);
}

[data-theme="dark"] .btn-ghost {
    background: transparent;
    color: var(--btn-ghost-color);
    border-color: var(--btn-ghost-border);
}
[data-theme="dark"] .btn-ghost:hover {
    background: var(--btn-ghost-bg-hover);
    border-color: rgba(255, 255, 255, 0.35);
    color: #fff;
}
[data-theme="dark"] .btn-pencil {
    background: var(--bg-btn-pencil);
    border-color: var(--border-main);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
}
[data-theme="dark"] .btn-pencil svg {
    color: rgba(255, 255, 255, 0.6);
}
[data-theme="dark"] .btn-pencil:hover {
    background: var(--bg-cell-hover);
    border-color: var(--board-border);
}
[data-theme="dark"] .btn-pencil:hover svg {
    color: #fff;
}

[data-theme="dark"] .btn-settings {
    border-color: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.5);
}
[data-theme="dark"] #btn-load-seed {
    border-radius: var(--radius-sm);
}

/* ── Toggle button active states ─────────────────────────────────── */
[data-theme="dark"] #btn-notes[data-active="true"],
[data-theme="dark"] #btn-numpad[data-active="true"] {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.3);
    color: #fff;
}
[data-theme="dark"] #btn-validate[data-active="true"] {
    background: rgba(100, 200, 100, 0.15);
    border-color: rgba(100, 200, 100, 0.5);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 0 0 1px rgba(100, 200, 100, 0.3);
    color: var(--correct-text);
}
[data-theme="dark"] #btn-validate[data-active="false"],
[data-theme="dark"] #btn-timer[data-active="false"] {
    color: rgba(255, 255, 255, 0.2);
    border-color: var(--border-cell);
}

[data-theme="dark"] #btn-timer[data-active="true"] {
    background: var(--btn-active-bg);
    border-color: var(--btn-active-border);
    border-radius: var(--radius-sm);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2);
    color: var(--btn-active-color);
}

/* ── Form controls ───────────────────────────────────────────────── */
[data-theme="dark"] .control-group label {
    text-transform: none;
    letter-spacing: 0.5px;
    padding-left: 1px;
}
[data-theme="dark"] .control-group select {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--border-input);
    border-radius: var(--radius-sm);
    font-family: var(--font-modern);
    height: 29px;
    padding: 0 26px 0 10px;
    line-height: 29px;
    box-sizing: border-box;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='rgba(255,255,255,0.5)' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}
[data-theme="dark"] #seed-input {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--border-input);
    border-radius: var(--radius-sm);
    font-family: var(--font-modern);
    font-size: 13px;
    height: 29px;
    letter-spacing: 2px;
    line-height: 29px;
    min-width: 135px;
    padding: 0 10px;
    text-transform: uppercase;
    width: clamp(135px, 9.5vw, 160px);
    box-sizing: border-box;
}

/* ── Status bar ──────────────────────────────────────────────────── */
[data-theme="dark"] .status {
    border-bottom-color: var(--border-light);
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--font-modern);
    font-style: italic;
}

/* ── Move cards ──────────────────────────────────────────────────── */
[data-theme="dark"] .move-card {
    border-radius: var(--radius-md);
    border-color: var(--border-cell);
    gap: 14px;
}
[data-theme="dark"] .move-card-label {
    text-transform: none;
    padding-left: 1px;
    font-family: var(--font-modern);
    font-weight: 500;
    letter-spacing: 2px;
}
[data-theme="dark"] .move-card-value {
    color: var(--text-primary);
    font-family: var(--font-modern);
    font-weight: 200;
    font-size: 2em;
}

/* ── Board ───────────────────────────────────────────────────────── */
[data-theme="dark"] #board {
    border-radius: var(--radius-lg);
    border-width: 2px;
    border-color: var(--board-border);
    background: var(--bg-cell);
    box-shadow: 0 24px 64px var(--board-shadow);
    gap: 0;
    overflow: hidden;
    outline: 4px solid var(--bg-board);
}
[data-theme="dark"] .cell {
    border-radius: 0 !important;
    border-color: rgba(255, 255, 255, 0.18);
}
[data-theme="dark"] .cell:first-child .cage-label {
    top: 6px;
    left: 7px;
}

[data-theme="dark"] .cell.bt {
    border-top-color: var(--cage-border);
}
[data-theme="dark"] .cell.bb {
    border-bottom-color: var(--cage-border);
}
[data-theme="dark"] .cell.bl {
    border-left-color: var(--cage-border);
}
[data-theme="dark"] .cell.br {
    border-right-color: var(--cage-border);
}

/* Board corner rounding */
[data-theme="dark"] #board .cell.corner-tl {
    border-top-left-radius: calc(var(--radius-lg) - 2px) !important;
}
[data-theme="dark"] #board .cell.corner-tr {
    border-top-right-radius: calc(var(--radius-lg) - 2px) !important;
}
[data-theme="dark"] #board .cell.corner-bl {
    border-bottom-left-radius: calc(var(--radius-lg) - 2px) !important;
}
[data-theme="dark"] #board .cell.corner-br {
    border-bottom-right-radius: calc(var(--radius-lg) - 2px) !important;
}

[data-theme="dark"] .cage-label {
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-modern);
    font-weight: 400;
    font-size: var(--cage-label-size, clamp(0.48rem, 1.6vw, 0.75rem));
    opacity: 0.7;
}
[data-theme="dark"] .cell-value {
    color: var(--text-primary);
    font-family: var(--font-modern);
    font-weight: 200;
    font-size: var(--cell-value-size, clamp(1.1rem, 3.8vw, 2.2rem));
}
[data-theme="dark"] .cell-value.user-input {
    color: var(--user-input-color);
    font-weight: 300;
}

/* ── Footer ──────────────────────────────────────────────────────── */
[data-theme="dark"] .footer {
    border-top-color: var(--border-light);
    color: rgba(255, 255, 255, 0.45);
}
[data-theme="dark"] .footer svg {
    opacity: 0.45;
}

/* ── Modal ───────────────────────────────────────────────────────── */
[data-theme="dark"] .modal {
    background: #2c3a47;
    border-color: var(--border-cell);
    border-radius: var(--radius-lg);
}
[data-theme="dark"] .modal p {
    color: var(--text-primary);
}

/* ── Progress ────────────────────────────────────────────────────── */
[data-theme="dark"] .progress-track {
    background: var(--border-cell);
    border-radius: 99px;
    height: 3px;
}
[data-theme="dark"] .progress-bar {
    border-radius: 99px;
    background: rgba(255, 255, 255, 0.6);
}
[data-theme="dark"] .progress-label,
[data-theme="dark"] #progress-text {
    color: rgba(255, 255, 255, 0.65);
}

/* ── Info button / Timer / App container ─────────────────────────── */
[data-theme="dark"] .info-btn {
    background: var(--border-cell);
    border-color: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.5);
}
[data-theme="dark"] .timer-display {
    color: rgba(255, 255, 255, 0.6);
}
[data-theme="dark"] .app-container {
    border-radius: 0;
    border: none;
}

/* ── Welcome screen ──────────────────────────────────────────────── */
[data-theme="dark"] .welcome-screen {
    background: var(--bg-board);
}
[data-theme="dark"] .welcome-inner h2 {
    color: var(--text-primary);
    font-family: var(--font-modern);
    font-weight: 200;
    letter-spacing: 4px;
    text-transform: uppercase;
}
[data-theme="dark"] .welcome-inner p {
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--font-modern);
    font-weight: 300;
}

/* ── Win banner ──────────────────────────────────────────────────── */
[data-theme="dark"] .win-banner-inner {
    border-radius: var(--radius-lg);
    font-family: var(--font-modern);
}
[data-theme="dark"] .win-text strong {
    font-family: var(--font-modern);
    font-weight: 200;
    letter-spacing: 6px;
}
[data-theme="dark"] .win-stats {
    border-radius: var(--radius-sm);
}
[data-theme="dark"] .win-seed-row {
    border-radius: var(--radius-sm);
    border-color: rgba(255, 209, 100, 0.2);
}
[data-theme="dark"] .win-divider {
    background: linear-gradient(
        90deg,
        transparent,
        var(--win-gold),
        transparent
    );
}
[data-theme="dark"] .win-trophy {
    color: var(--win-gold);
    filter: drop-shadow(0 0 16px rgba(255, 209, 100, 0.35));
}

[data-theme="dark"] .win-stat-label {
    font-family: var(--font-modern);
}
[data-theme="dark"] .win-stat-value {
    font-family: var(--font-modern);
    font-weight: 300;
}
[data-theme="dark"] .win-stat-seed {
    font-family: var(--font-modern);
    color: var(--win-gold);
    letter-spacing: 3px;
}

[data-theme="dark"] .win-buttons .btn {
    border-radius: var(--radius-sm);
}
[data-theme="dark"] .win-buttons #win-new {
    background: var(--win-gold);
    color: #0f0f1e;
    border-color: var(--win-gold);
    font-weight: 600;
}
[data-theme="dark"] .win-buttons #win-new:hover {
    background: var(--win-gold-hover);
    border-color: var(--win-gold-hover);
}

/* ── Info popup ──────────────────────────────────────────────────── */
[data-theme="dark"] .info-popup {
    background: var(--accent-dark);
    border-color: var(--border-input);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    font-family: var(--font-modern);
    color: rgba(255, 255, 255, 0.7);
}
[data-theme="dark"] .info-popup::after {
    border-bottom-color: var(--accent-dark);
}
[data-theme="dark"] .info-popup strong {
    color: #fff;
    font-weight: 500;
    letter-spacing: 1.5px;
}
[data-theme="dark"] .info-popup ul li {
    color: rgba(255, 255, 255, 0.55);
    font-weight: 300;
}

/* ── Misc ────────────────────────────────────────────────────────── */
[data-theme="dark"] .settings-imprint-address a {
    color: #7eb3f5;
}
[data-theme="dark"] label[for="size"] {
    padding-left: 2px;
}
[data-theme="dark"] .label-upper {
    display: none;
}
[data-theme="dark"] .label-title {
    display: inline;
}
[data-theme="dark"] .theme-btn.active {
    border-color: var(--win-gold);
    box-shadow: inset 0 0 0 1px var(--win-gold);
    color: var(--win-gold);
}
[data-theme="dark"] .version,
[data-theme="dark"] .timer-display-header {
    font-family: var(--font-modern);
}

/* ── Daily button ────────────────────────────────────────────────── */
[data-theme="dark"] #btn-daily[data-solved="true"] {
    color: #4ade80;
}
[data-theme="dark"] #btn-daily[data-solved="true"]::after {
    background: #4ade80;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M2 5l2.5 2.5L8 3' stroke='%23111' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round' fill='none'/%3E%3C/svg%3E");
    background-size: cover;
}

/* ── Stats ───────────────────────────────────────────────────────── */
[data-theme="dark"] .stats-table th,
[data-theme="dark"] .stats-total-label,
[data-theme="dark"] .stats-empty,
[data-theme="dark"] .stats-size-cell {
    color: var(--text-muted);
}

/* ── Leaderboard ─────────────────────────────────────────────────── */
[data-theme="dark"] .lb-section-title,
[data-theme="dark"] .lb-info,
[data-theme="dark"] .lb-moves,
[data-theme="dark"] .lb-date {
    color: var(--text-muted);
}
[data-theme="dark"] .lb-time {
    color: #7dd3fc;
}
[data-theme="dark"] .lb-entry-modal[data-rank="1"] {
    border-top-color: #fbbf24;
}
[data-theme="dark"] .lb-entry-modal[data-rank="2"] {
    border-top-color: #cbd5e1;
}
[data-theme="dark"] .lb-entry-modal[data-rank="3"] {
    border-top-color: #d97706;
}
[data-theme="dark"] .lb-rank-value {
    color: rgba(255, 255, 255, 0.85);
}

/* ── Update banner ───────────────────────────────────────────────── */
[data-theme="dark"] .update-banner-inner {
    background: var(--bg-card, #1e2a38);
}

/* ── Tutorial ────────────────────────────────────────────────────── */
[data-theme="dark"] .tut-modal {
    background: var(--bg-card, #1e2a38);
}
[data-theme="dark"] .tcell {
    background: #1a2433;
    border: 1px solid rgba(255, 255, 255, 0.06);
}
[data-theme="dark"] .tcell.ct {
    border-top-color: rgba(255, 255, 255, 0.6) !important;
}
[data-theme="dark"] .tcell.cr {
    border-right-color: rgba(255, 255, 255, 0.6) !important;
}
[data-theme="dark"] .tcell.cb {
    border-bottom-color: rgba(255, 255, 255, 0.6) !important;
}
[data-theme="dark"] .tcell.cl {
    border-left-color: rgba(255, 255, 255, 0.6) !important;
}
[data-theme="dark"] .tcell:hover {
    background: #1e2d40;
}
[data-theme="dark"] .tcell.tsel {
    background: #1a3a2a !important;
}
[data-theme="dark"] .tcell.terror {
    background: #3a1a1a !important;
}
[data-theme="dark"] .tut-latin-row span {
    background: #1a2433;
}

/* ── Mobile ──────────────────────────────────────────────────────── */
@media (max-width: 600px) {
    [data-theme="dark"] .mobile-bottom-nav {
        background: #1a2332;
        border-top: 1px solid rgba(255, 255, 255, 0.06);
    }
    [data-theme="dark"] .mobile-nav-item {
        color: rgba(255, 255, 255, 0.3);
    }
    [data-theme="dark"] .mobile-nav-item:active,
    [data-theme="dark"] .mobile-nav-item.active {
        color: #7ec8c0;
    }
    [data-theme="dark"] .mobile-toolbar {
        background: #1a2332;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    [data-theme="dark"] .mobile-btn-new {
        background: #3d6b8c;
    }
}