/* ╔══════════════════════════════════════════════════════════╗
   ║  GomokuBattle — "Ink & Wood" Theme                       ║
   ║  Inspired by traditional board game parlors               ║
   ╚══════════════════════════════════════════════════════════╝ */

/* 本地化字体（不再走 Google CDN）：
   - Crimson Text / JetBrains Mono 走 static/lib/fonts/ 下的 woff2
   - 中文字符（Noto Serif SC）由系统字体兜底，体积太大不做本地化 */
@import url('/static/lib/fonts/fonts.css');

/* 中文字体系统兜底栈：优先用本机已安装的中文衬线字体 */
@font-face {
    font-family: 'Noto Serif SC';
    src: local('Noto Serif SC'),
         local('Noto Serif CJK SC'),
         local('Source Han Serif SC'),
         local('Source Han Serif CN'),
         local('Songti SC'),
         local('STSong'),
         local('SimSun');
    font-display: swap;
}

:root {
    /* ── Core palette ── */
    --ink-black: #0d0d0d;
    --ink-charcoal: #1a1a1e;
    --ink-slate: #23232a;
    --ink-dark: #2a2a34;

    --wood-base: #c4956a;
    --wood-warm: #deb887;
    --wood-light: #e8d5b7;
    --wood-dark: #8b6914;
    --wood-bg: #3d2b1f;

    --paper: #f5f0e8;
    --paper-dim: #e8e0d5;

    --gold: #d4a574;
    --gold-bright: #f0c27a;
    --gold-muted: #a08060;

    --amber: #e8a840;
    --cinnabar: #c04040;
    --jade: #5a9e6f;
    --jade-dark: #3d7a4f;

    /* ── Semantic ── */
    --bg-root: var(--ink-black);
    --bg-surface: var(--ink-charcoal);
    --bg-elevated: var(--ink-slate);
    --bg-hover: rgba(255, 255, 255, 0.04);

    --text-primary: var(--paper);
    --text-secondary: #9a9588;
    --text-muted: #6b6660;
    --text-accent: var(--gold-bright);

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.10);
    --border-amber: rgba(212, 165, 116, 0.3);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
    --shadow-gold: 0 0 30px rgba(212, 165, 116, 0.15);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --font-display: 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', serif;
    --font-body: 'Crimson Text', 'Noto Serif SC', 'Songti SC', 'STSong', 'SimSun', Georgia, serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background: var(--bg-root);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Subtle grain overlay on body */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--ink-black);
}
::-webkit-scrollbar-thumb {
    background: var(--ink-dark);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gold-muted);
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.text-gradient {
    background: linear-gradient(135deg, var(--gold-bright) 0%, var(--wood-base) 50%, var(--amber) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.text-muted {
    color: var(--text-secondary) !important;
}

/* ── Navbar ── */
.navbar {
    background: linear-gradient(180deg,
        rgba(26, 26, 30, 0.98) 0%,
        rgba(26, 26, 30, 0.85) 100%) !important;
    border-bottom: 1px solid var(--border-medium);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.6rem 1.5rem;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03);
}

.navbar-brand {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.35rem;
    letter-spacing: 0.04em;
    color: var(--gold-bright) !important;
    transition: color var(--transition-base);
}

.navbar-brand:hover {
    color: var(--wood-light) !important;
}

.navbar-brand i {
    margin-right: 0.5rem;
    font-size: 1.2rem;
}

.nav-link {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 0.925rem;
    color: var(--text-secondary) !important;
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem !important;
    margin: 0 0.15rem;
    letter-spacing: 0.03em;
}

.nav-link:hover,
.nav-link.active {
    color: var(--gold-bright) !important;
    background: rgba(212, 165, 116, 0.08);
}

.nav-link i {
    margin-right: 0.35rem;
}

/* ── Cards ── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-slow);
    overflow: hidden;
}

.card:hover {
    border-color: var(--border-medium);
    box-shadow: var(--shadow-md);
}

.card-header {
    background: linear-gradient(180deg,
        rgba(35, 35, 42, 0.9) 0%,
        rgba(26, 26, 30, 0.95) 100%);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 1.25rem;
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: 0.03em;
}

.card-header.bg-primary {
    background: linear-gradient(135deg, var(--wood-dark) 0%, var(--wood-base) 100%) !important;
    border-bottom: 1px solid var(--border-amber);
}

.card-header.bg-success {
    background: linear-gradient(135deg, var(--jade-dark) 0%, var(--jade) 100%) !important;
    border-bottom: 1px solid rgba(90, 158, 111, 0.3);
}

.card-header.bg-danger {
    background: linear-gradient(135deg, #6b2020 0%, var(--cinnabar) 100%) !important;
    border-bottom: 1px solid rgba(192, 64, 64, 0.3);
}

.card-header.bg-secondary {
    background: linear-gradient(135deg, var(--ink-dark) 0%, var(--ink-slate) 100%) !important;
    border-bottom: 1px solid var(--border-medium);
}

.card-body {
    padding: 1.5rem;
}

/* ── Game Mode Cards ── */
.game-mode-card {
    cursor: pointer;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.game-mode-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center,
        rgba(212, 165, 116, 0.06) 0%,
        transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.game-mode-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-amber);
    box-shadow: var(--shadow-lg), var(--shadow-gold);
}

.game-mode-card:hover::before {
    opacity: 1;
}

.game-mode-card i {
    transition: transform var(--transition-slow);
    color: var(--gold);
}

.game-mode-card:hover i {
    transform: scale(1.15);
    color: var(--gold-bright);
}

.game-mode-card .card-title {
    color: var(--text-primary);
    margin-top: 0.75rem;
}

.game-mode-card .card-text {
    color: var(--text-secondary);
}

/* ── Buttons ── */
.btn {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: 0.03em;
    border-radius: var(--radius-sm);
    padding: 0.6rem 1.25rem;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--wood-dark) 0%, var(--wood-base) 50%, var(--gold-muted) 100%);
    color: var(--paper);
    border-color: rgba(212, 165, 116, 0.4);
    box-shadow: 0 2px 12px rgba(196, 149, 106, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--wood-base) 0%, var(--gold) 50%, var(--gold-bright) 100%);
    color: var(--ink-black);
    border-color: var(--gold-bright);
    box-shadow: 0 4px 20px rgba(212, 165, 116, 0.35);
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, var(--jade-dark) 0%, var(--jade) 100%);
    color: var(--paper);
    border-color: rgba(90, 158, 111, 0.4);
    box-shadow: 0 2px 12px rgba(90, 158, 111, 0.2);
}

.btn-success:hover {
    background: linear-gradient(135deg, var(--jade) 0%, #6aae7f 100%);
    border-color: rgba(90, 158, 111, 0.6);
    box-shadow: 0 4px 20px rgba(90, 158, 111, 0.35);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, #6b2020 0%, var(--cinnabar) 100%);
    color: var(--paper);
    border-color: rgba(192, 64, 64, 0.4);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--cinnabar) 0%, #d45050 100%);
    border-color: rgba(192, 64, 64, 0.6);
    transform: translateY(-1px);
}

.btn-warning {
    background: linear-gradient(135deg, #8b6914 0%, var(--amber) 100%);
    color: var(--ink-black);
    border-color: rgba(232, 168, 64, 0.4);
}

.btn-outline-light {
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.35);
    color: var(--text-primary);
}

.btn-outline-warning {
    border: 1px solid var(--border-amber);
    color: var(--gold);
}

.btn-outline-warning:hover {
    background: rgba(212, 165, 116, 0.1);
    border-color: var(--gold-bright);
    color: var(--gold-bright);
}

.btn-outline-danger {
    border: 1px solid rgba(192, 64, 64, 0.4);
    color: var(--cinnabar);
}

.btn-outline-danger:hover {
    background: rgba(192, 64, 64, 0.1);
    border-color: rgba(192, 64, 64, 0.6);
    color: #d45050;
}

.btn-sm {
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1.1rem;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ── Form Controls ── */
.form-control {
    background-color: #2a2a34 !important;
    border: 1px solid #3d3d4a;
    border-radius: var(--radius-sm);
    padding: 0.7rem 1rem;
    color: #f5f0e8 !important;
    font-family: var(--font-body);
    transition: all var(--transition-base);
}

.form-control:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(212, 165, 116, 0.12);
    background-color: #23232a !important;
    outline: none;
}

.form-control::placeholder {
    color: #6b6660 !important;
    opacity: 1;
}

.form-control:-webkit-autofill,
.form-control:-webkit-autofill:hover,
.form-control:-webkit-autofill:focus {
    -webkit-text-fill-color: var(--text-primary);
    -webkit-box-shadow: 0 0 0px 1000px var(--ink-dark) inset;
    transition: background-color 5000s ease-in-out 0s;
}

.form-label {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.03em;
}

/* ── Badges ── */
.badge {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.78rem;
    padding: 0.35rem 0.7rem;
    border-radius: 3px;
    letter-spacing: 0.03em;
}

.badge.bg-primary {
    background: linear-gradient(135deg, var(--wood-dark), var(--wood-base)) !important;
}
.badge.bg-success {
    background: linear-gradient(135deg, var(--jade-dark), var(--jade)) !important;
}
.badge.bg-danger {
    background: linear-gradient(135deg, #6b2020, var(--cinnabar)) !important;
}
.badge.bg-warning {
    background: linear-gradient(135deg, #8b6914, var(--amber)) !important;
    color: var(--ink-black);
}
.badge.bg-secondary {
    background: var(--ink-dark) !important;
    border: 1px solid var(--border-medium);
}
.badge.bg-info {
    background: linear-gradient(135deg, #1a3a4a, #2a6a8a) !important;
}

/* ── Progress ── */
.progress {
    background: var(--ink-dark);
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar {
    border-radius: 3px;
}
.progress-bar.bg-success {
    background: linear-gradient(90deg, var(--jade-dark), var(--jade)) !important;
}

/* ── Dropdown ── */
.dropdown-menu {
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.4rem;
    backdrop-filter: blur(12px);
}

.dropdown-item {
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    padding: 0.55rem 0.9rem;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--gold-bright);
}

.dropdown-divider {
    border-color: var(--border-subtle);
    margin: 0.25rem 0;
}

/* ── List Group ── */
.list-group-item {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border-subtle);
    padding: 0.85rem 1.25rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item:hover {
    background: var(--bg-hover);
}

.list-group-item-action {
    cursor: pointer;
}

.list-group-item-action:hover {
    background: rgba(212, 165, 116, 0.06);
}

/* ── Tables ── */
.table {
    color: var(--text-primary);
    /* 关键：Bootstrap cell 选择器特异性更高，必须用 CSS 变量从源头改色，否则 td/th/strong/small 全部深色 */
    --bs-table-color: var(--text-primary);
    --bs-table-bg: transparent;
    --bs-table-hover-bg: var(--bg-hover);
    --bs-table-border-color: var(--border-subtle);
}

/* 兜底：直接覆盖 cell 选择器，确保 td/th 继承到亮色 */
.table > :not(caption) > * > * {
    color: var(--text-primary);
    background-color: transparent;
}

.table th {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.04em;
    border-bottom: 2px solid var(--border-amber);
    text-transform: uppercase;
}

/* ── Modals ── */
.modal-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    border-bottom: 1px solid var(--border-subtle);
    padding: 1.25rem 1.5rem;
}

.modal-header.bg-primary {
    background: linear-gradient(135deg, var(--wood-dark) 0%, var(--wood-base) 100%) !important;
}

.modal-header.bg-success {
    background: linear-gradient(135deg, var(--jade-dark) 0%, var(--jade) 100%) !important;
}

.modal-header.bg-danger {
    background: linear-gradient(135deg, #6b2020 0%, var(--cinnabar) 100%) !important;
}

.modal-header .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
}

/* ── Toast / Toastr Overrides ── */
.toast {
    background: var(--bg-elevated);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

#toast-container > .toast {
    background-image: none !important;
    opacity: 1;
}

#toast-container > .toast-success {
    background: linear-gradient(135deg, #1a3320, #2a4a30) !important;
    border-color: rgba(90, 158, 111, 0.3);
}

#toast-container > .toast-error {
    background: linear-gradient(135deg, #331a1a, #4a2020) !important;
    border-color: rgba(192, 64, 64, 0.3);
}

#toast-container > .toast-warning {
    background: linear-gradient(135deg, #332a1a, #4a3a20) !important;
    border-color: rgba(232, 168, 64, 0.3);
}

#toast-container > .toast-info {
    background: linear-gradient(135deg, #1a2a33, #203040) !important;
    border-color: rgba(100, 160, 200, 0.3);
}

/* ── Game Container (Canvas board) ── */
#gameContainer {
    position: relative;
    background: linear-gradient(145deg, #5a3a20 0%, #4a2a15 30%, #3d2010 70%, #2a1508 100%);
    border-radius: var(--radius-md);
    box-shadow:
        var(--shadow-lg),
        inset 0 0 60px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(139, 105, 20, 0.08);
    padding: 6px;
    border: 1px solid rgba(139, 105, 20, 0.25);
}

#gameContainer::after {
    content: '';
    position: absolute;
    inset: 6px;
    border-radius: 4px;
    pointer-events: none;
    box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.3);
}

#gameCanvas {
    display: block;
    cursor: pointer;
    border-radius: 3px;
    transition: filter var(--transition-base);
}

#gameCanvas:hover {
    filter: brightness(1.03);
}

/* ── User Panel ── */
#userPanel .card {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
}

#userPanel .card-body {
    padding: 2rem 1.5rem;
}

.user-avatar-placeholder {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--wood-dark), var(--wood-base));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--paper);
    margin: 0 auto;
    box-shadow: 0 0 20px rgba(196, 149, 106, 0.2);
}

/* ── Rankings Table ── */
#rankingsTable {
    --bs-table-color: var(--text-primary);
    --bs-table-bg: transparent;
    --bs-table-hover-bg: rgba(212, 165, 116, 0.06);
    --bs-table-border-color: var(--border-subtle);
    color: var(--text-primary);
}

#rankingsTable > :not(caption) > * > * {
    color: var(--text-primary);
    background-color: transparent;
    border-bottom-color: var(--border-subtle);
    vertical-align: middle;
}

#rankingsTable tbody tr {
    transition: all var(--transition-base);
}

#rankingsTable tbody tr:hover {
    background: rgba(212, 165, 116, 0.05);
}

#rankingsTable tbody tr:hover > * {
    background-color: rgba(212, 165, 116, 0.05) !important;
    color: var(--gold-bright);
}

#rankingsTable th {
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-amber) !important;
    background: var(--bg-elevated) !important;
    font-family: var(--font-display);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.82rem;
}

/* 段位 badge 颜色：用品牌色替换 Bootstrap 默认灰 */
#rankingsTable .badge {
    font-family: var(--font-display);
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: 0.35rem 0.65rem;
}

/* 排名奖牌 */
#rankingsTable .rank-medal {
    font-size: 1.05rem;
    line-height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 22px;
    text-align: center;
    vertical-align: middle;
}

/* 胜率小数字 */
#rankingsTable .win-rate {
    font-family: var(--font-mono);
    color: var(--gold-bright);
    font-weight: 600;
}

/* 前三名的玩家名加亮 */
#rankingsTable tbody tr.top-rank strong {
    color: var(--gold-bright);
}

/* ── Turn Indicator ── */
#turnIndicator > div {
    min-width: 60px;
}

.turn-active {
    animation: pulse-gold 2s ease-in-out infinite;
}

@keyframes pulse-gold {
    0%, 100% { box-shadow: 0 0 0 0 rgba(212, 165, 116, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(212, 165, 116, 0); }
}

/* ── Waiting Overlay ── */
#waitingOverlay {
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-md);
}

/* ── Spinner ── */
.spinner-border {
    width: 2rem;
    height: 2rem;
    border-color: var(--gold);
    border-right-color: transparent;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

/* ── Shadows & Effects ── */
.shadow-glow {
    box-shadow: 0 0 30px rgba(212, 165, 116, 0.2);
}

/* ── Hero Section ── */
.hero-section {
    position: relative;
    padding: 3rem 0 2rem;
    text-align: center;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-amber), transparent);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--text-secondary);
    font-size: 1.15rem;
}

/* ── Stat Number ── */
.user-stats {
    display: flex;
    align-items: stretch;
    text-align: center;
    width: 100%;
}

.stat-cell {
    flex: 1 1 0;
    min-width: 0;          /* 关键：允许 flex 子项收缩到内容以下 */
    padding: 0.35rem 0.15rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    gap: 0.2rem;
}

.stat-cell + .stat-cell::before {
    content: '';
    position: absolute;
    left: 0;
    top: 18%;
    bottom: 18%;
    width: 1px;
    background: var(--border-subtle);
}

.stat-number {
    font-family: var(--font-mono);
    font-size: clamp(0.95rem, 3.6vw, 1.45rem);
    font-weight: 600;
    color: var(--gold-bright);
    letter-spacing: -0.03em;
    line-height: 1.1;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
    max-width: 100%;
    overflow: hidden;
    text-overflow: clip;
}

.stat-label {
    font-family: var(--font-display);
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1;
}

/* ── Room Code Display ── */
.room-code-display {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--gold-bright);
    background: var(--ink-dark);
    border: 1px dashed var(--border-amber);
    border-radius: var(--radius-sm);
    padding: 0.6rem 1.2rem;
    display: inline-block;
}

/* ── Piece indicators ── */
.piece-black {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #555, #111);
    box-shadow: 1px 2px 4px rgba(0, 0, 0, 0.5);
    display: inline-block;
}

.piece-white {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #fff, #ccc);
    box-shadow: 1px 2px 4px rgba(0, 0, 0, 0.3);
    display: inline-block;
}

/* ── Page transitions ── */
.page-section {
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Decorative divider ── */
.divider-ink {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--border-amber), transparent);
    margin: 1.5rem 0;
    border: none;
}

/* ── Game History items ── */
.history-item,
.history-row {
    transition: all var(--transition-base);
    border-left: 2px solid transparent;
    padding: 0.95rem 1.25rem;
}

.history-item:hover,
.history-row:hover {
    border-left-color: var(--gold-muted);
    background: var(--bg-hover);
}

.history-win {
    border-left-color: var(--jade) !important;
}

.history-loss {
    border-left-color: var(--cinnabar) !important;
}

/* ── Lobby Tabs Card (Active / History) ── */
.lobby-tabs-card > .card-header {
    border-bottom: 0;
}

.lobby-tabs-card .nav-tabs {
    border-bottom: 1px solid var(--border-subtle);
    padding: 0 0.25rem;
    margin: 0;
}

.lobby-tabs-card .nav-tabs .nav-link {
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    background: transparent;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.92rem;
    padding: 0.85rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    transition: all var(--transition-base);
    border-radius: 0;
    margin: 0;
    line-height: 1.2;
}

.lobby-tabs-card .nav-tabs .nav-link i {
    font-size: 1rem;
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.lobby-tabs-card .nav-tabs .nav-link:hover {
    color: var(--text-primary);
    background: transparent;
    border-bottom-color: var(--border-medium);
}

.lobby-tabs-card .nav-tabs .nav-link:hover i {
    color: var(--gold);
}

.lobby-tabs-card .nav-tabs .nav-link.active {
    color: var(--gold-bright);
    background: transparent;
    border-bottom-color: var(--gold);
}

.lobby-tabs-card .nav-tabs .nav-link.active i {
    color: var(--gold-bright);
}

.tab-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 20px;
    padding: 0 0.45rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--ink-dark);
    border: 1px solid var(--border-medium);
    border-radius: 10px;
    line-height: 1;
    transition: all var(--transition-base);
}

.lobby-tabs-card .nav-tabs .nav-link.active .tab-badge {
    color: var(--gold-bright);
    background: rgba(212, 165, 116, 0.12);
    border-color: var(--border-amber);
}

.tab-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.7rem 1.25rem;
    background: rgba(255, 255, 255, 0.015);
    border-bottom: 1px solid var(--border-subtle);
}

.tab-toolbar small {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.8rem;
}

/* ── Room list (不套 list-group，纯 div + flex) ── */
.room-list {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-height: 540px;
    overflow-y: auto;
    background: transparent;
}

.room-list-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 3rem 1rem;
    color: var(--text-muted);
    text-align: center;
}

.room-list-empty i {
    font-size: 1.8rem;
    opacity: 0.5;
}

.room-list-empty .small {
    font-size: 0.85rem;
}

/* Room / History row */
.room-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    width: 100%;
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-subtle);
    transition: background var(--transition-base), border-left-color var(--transition-base);
    color: var(--text-primary);
    background: transparent;
    text-decoration: none;
    flex-wrap: nowrap;
    min-width: 0;
}

.room-row:last-child {
    border-bottom: none;
}

a.room-row:hover,
.room-row.is-clickable:hover {
    background: rgba(212, 165, 116, 0.06);
    color: var(--text-primary);
    text-decoration: none;
}

.room-row-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    flex: 1 1 auto;
    gap: 0.25rem;
    overflow: hidden;
}

.room-row-code {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.18em;
    color: var(--gold-bright);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.room-row-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.15rem 0.7rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 0;
}

.room-row-meta .meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}

.room-row-meta .meta-item i {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.room-row-side {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.room-row-result {
    font-family: var(--font-display);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.55rem;
    border-radius: 3px;
    border: 1px solid transparent;
}

.room-row-result.win {
    color: var(--jade);
    background: rgba(90, 158, 111, 0.1);
    border-color: rgba(90, 158, 111, 0.3);
}

.room-row-result.loss {
    color: var(--cinnabar);
    background: rgba(192, 64, 64, 0.1);
    border-color: rgba(192, 64, 64, 0.3);
}

.room-row-result.draw {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-medium);
}

/* ── Lobby Pagination (纯自定义，不依赖 Bootstrap .pagination) ── */
.lobby-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.015);
}

.lobby-pagination.is-hidden {
    display: none !important;
}

.lobby-pagination .page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 32px;
    padding: 0 0.5rem;
    background: var(--ink-dark);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-base);
}

.lobby-pagination .page-btn:hover:not(:disabled) {
    background: rgba(212, 165, 116, 0.1);
    border-color: var(--border-amber);
    color: var(--gold-bright);
}

.lobby-pagination .page-btn:active:not(:disabled) {
    transform: scale(0.96);
}

.lobby-pagination .page-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    background: transparent;
}

.lobby-pagination .page-info {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 70px;
    height: 32px;
    padding: 0 0.75rem;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    letter-spacing: 0.04em;
}

@media (max-width: 768px) {
    .room-list {
        max-height: 420px;
    }

    .lobby-tabs-card .nav-tabs .nav-link {
        padding: 0.7rem 0.7rem;
        font-size: 0.85rem;
    }

    .lobby-tabs-card .nav-tabs .nav-link .tab-text {
        display: none;
    }

    .room-row {
        padding: 0.75rem 0.9rem;
        gap: 0.5rem;
    }

    .room-row-meta {
        gap: 0.15rem 0.5rem;
        font-size: 0.75rem;
    }

    .user-stats {
        /* 极窄屏也撑得住 */
    }
}

/* ── Responsive ── */
@media (max-width: 992px) {
    #gameCanvas {
        max-width: 100%;
        height: auto;
    }

    #gameContainer {
        max-width: 100%;
        margin: 0 auto;
    }

    .game-mode-card {
        margin-bottom: 1rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 0.95rem;
    }

    .navbar-brand {
        font-size: 1.15rem;
    }

    .card-body {
        padding: 1rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.88rem;
    }

    .room-code-display {
        font-size: 1.4rem;
        letter-spacing: 0.2em;
    }
}

@media (max-width: 576px) {
    #gameCanvas {
        max-width: 100%;
    }

    .hero-title {
        font-size: 1.4rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }
}

/* ── Podium (领奖台 Top 3) ── */
.podium {
    display: grid;
    grid-template-columns: 1fr 1.1fr 1fr;
    gap: 0.75rem;
    align-items: end;
    padding: 0.25rem 0.25rem 0;
}

.podium-slot {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 0.75rem 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.podium-slot:hover {
    border-color: var(--border-amber);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.podium-slot-1 {
    background: linear-gradient(180deg, rgba(212, 165, 116, 0.18) 0%, var(--bg-elevated) 80%);
    border-color: var(--border-amber);
    box-shadow: var(--shadow-gold);
    min-height: 140px;
}

.podium-slot-2,
.podium-slot-3 {
    min-height: 110px;
}

.podium-medal {
    font-size: 1.9rem;
    line-height: 1;
    margin-bottom: 0.3rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.podium-slot-1 .podium-medal {
    font-size: 2.4rem;
}

.podium-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 0.2rem;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.podium-slot-1 .podium-name {
    color: var(--gold-bright);
    font-size: 1.05rem;
}

.podium-rate {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 700;
    color: var(--gold-bright);
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

.podium-stats {
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

@media (max-width: 576px) {
    .podium {
        gap: 0.4rem;
    }

    .podium-slot {
        padding: 0.5rem 0.3rem;
    }

    .podium-slot-1 { min-height: 120px; }
    .podium-slot-2,
    .podium-slot-3 { min-height: 95px; }

    .podium-medal { font-size: 1.5rem; }
    .podium-slot-1 .podium-medal { font-size: 1.8rem; }
    .podium-name { font-size: 0.8rem; }
    .podium-rate { font-size: 0.85rem; }
    .podium-stats { font-size: 0.7rem; }
}

/* ── "我的排名"行高亮 ── */
#rankingsTable tbody tr.my-rank-row {
    background: rgba(212, 165, 116, 0.08);
    border-left: 3px solid var(--gold);
}

#rankingsTable tbody tr.my-rank-row > * {
    background-color: rgba(212, 165, 116, 0.08) !important;
    color: var(--gold-bright);
    font-weight: 600;
}

#rankingsTable tbody tr.my-rank-row strong {
    color: var(--gold-bright);
}

/* ── Rankings page compact mode ── */
.rankings-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 0.04em;
    line-height: 1.2;
}

.rankings-title i {
    margin-right: 0.4rem;
}

@media (max-width: 576px) {
    .rankings-title { font-size: 1.25rem; }
}

/* 统计条 — 横向 4 格（最后一格条件性展示） */
.stats-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

@media (max-width: 768px) {
    .stats-strip { grid-template-columns: repeat(2, 1fr); }
}

.stat-mini {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.65rem 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    transition: border-color var(--transition-base);
}

.stat-mini:hover {
    border-color: var(--border-medium);
}

.stat-mini-highlight {
    background: linear-gradient(135deg, rgba(212, 165, 116, 0.12) 0%, var(--bg-surface) 70%);
    border-color: var(--border-amber);
}

.stat-mini-label {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    line-height: 1;
}

.stat-mini-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.stat-mini-highlight .stat-mini-value {
    color: var(--gold-bright);
}

/* 紧凑表格：行高减小 */
.rankings-table {
    font-size: 0.9rem;
}

.rankings-table > :not(caption) > * > * {
    padding: 0.3rem 0.6rem;
    vertical-align: middle;
    line-height: 1.2;
}

.rankings-table thead th {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--text-muted);
    line-height: 1.2;
}

.rankings-table tbody tr {
    transition: background var(--transition-base);
}

.rankings-table tbody td {
    line-height: 1.2;
}

.rankings-table tbody td strong {
    display: inline-block;
    line-height: 20px;
    font-weight: 600;
}

.rankings-table tbody td .badge {
    font-weight: 500;
    padding: 0.2rem 0.55rem;
    line-height: 1.2;
}

/* 胜率单元格：进度条 + 数字 一行展示 */
.winrate-cell {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-width: 0;
    height: 20px;
}

.winrate-cell .progress {
    background: var(--ink-dark);
    border-radius: 3px;
    overflow: hidden;
    flex: 1 1 auto;
}

.winrate-cell .progress-bar {
    background: linear-gradient(90deg, var(--jade-dark), var(--jade)) !important;
    border-radius: 3px;
    transition: width var(--transition-base);
}

.winrate-cell .win-rate {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gold-bright);
    min-width: 48px;
    text-align: right;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* ── Animations ── */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.animate-float {
    animation: float 4s ease-in-out infinite;
}

/* ── Utility ── */
.cursor-pointer {
    cursor: pointer;
}

.text-gold {
    color: var(--gold-bright) !important;
}

.text-jade {
    color: var(--jade) !important;
}

.bg-ink {
    background: var(--bg-surface) !important;
}

.border-amber {
    border-color: var(--border-amber) !important;
}