/* =====================================================================
   play2048.cn — 全站样式
   风格：赛博朋克 × 玻璃拟态（Glassmorphism）
   深色底 + 霓虹青主色 + 渐变玻璃卡片 + 扫描线氛围
   ===================================================================== */

:root {
  --bg-0: #0a0a0f;
  --bg-1: #12121f;
  --panel: rgba(255, 255, 255, 0.045);
  --panel-strong: rgba(18, 18, 31, 0.72);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);

  --cyan: #00f0ff;
  --cyan-soft: rgba(0, 240, 255, 0.14);
  --magenta: #ff2bd6;
  --amber: #ffb03c;
  --lime: #b6ff3c;

  --text: #e8f4ff;
  --text-dim: #8fa3bf;
  --text-faint: #5a6b85;

  --danger: #ff5470;

  --radius: 18px;
  --radius-sm: 12px;

  --font-sans: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;

  --shadow-neon: 0 0 18px rgba(0, 240, 255, 0.35), 0 0 46px rgba(0, 240, 255, 0.12);
  --move-ms: 150ms;

  /* 主题相关表面色（浅色主题在 html[data-theme="light"] 中覆盖） */
  --header-bg: rgba(10, 10, 15, 0.72);
  --btn-bg: rgba(255, 255, 255, 0.05);
  --btn-bg-hover: rgba(255, 255, 255, 0.09);
  --seg-bg: rgba(0, 0, 0, 0.3);
  --input-bg: rgba(0, 0, 0, 0.35);
  --mask-bg: rgba(4, 4, 10, 0.66);
  --badge-bg: rgba(255, 255, 255, 0.06);
  --row-hover: rgba(255, 255, 255, 0.035);
  --row-line: rgba(255, 255, 255, 0.05);
}

/* ---------------- 浅色主题 ---------------- */

html[data-theme="light"] {
  --bg-0: #eef2f8;
  --bg-1: #e2e9f4;
  --panel: rgba(255, 255, 255, 0.62);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --line: rgba(20, 40, 80, 0.12);
  --line-strong: rgba(20, 40, 80, 0.22);

  --cyan: #007ea8;
  --cyan-soft: rgba(0, 126, 168, 0.10);
  --magenta: #c2119b;
  --amber: #c06500;
  --lime: #4e8f00;
  --danger: #d92b4b;

  --text: #1a2540;
  --text-dim: #45577a;
  --text-faint: #75849f;

  --shadow-neon: 0 0 18px rgba(0, 126, 168, 0.20), 0 0 46px rgba(0, 126, 168, 0.08);

  --header-bg: rgba(245, 248, 252, 0.82);
  --btn-bg: rgba(20, 40, 80, 0.05);
  --btn-bg-hover: rgba(20, 40, 80, 0.10);
  --seg-bg: rgba(20, 40, 80, 0.06);
  --input-bg: rgba(255, 255, 255, 0.9);
  --mask-bg: rgba(226, 234, 245, 0.62);
  --badge-bg: rgba(20, 40, 80, 0.07);
  --row-hover: rgba(20, 40, 80, 0.045);
  --row-line: rgba(20, 40, 80, 0.08);
}

html[data-theme="light"] body {
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(194, 17, 155, 0.06), transparent 60%),
    radial-gradient(1000px 700px at -10% 30%, rgba(0, 126, 168, 0.09), transparent 55%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 55%, var(--bg-0));
  background-attachment: fixed;
}

html[data-theme="light"] .glow { opacity: 0.10; }
html[data-theme="light"] .scanlines { opacity: 0.35; }

html[data-theme="light"] .hero-title {
  background-image: linear-gradient(120deg, var(--cyan) 12%, #6a3ad6 55%, var(--magenta) 90%);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font-sans);
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(255, 43, 214, 0.10), transparent 60%),
    radial-gradient(1000px 700px at -10% 30%, rgba(0, 240, 255, 0.10), transparent 55%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 55%, var(--bg-0));
  background-attachment: fixed;
  overflow-x: hidden;
}

/* ---------------- 背景氛围层 ---------------- */

.bg-fx { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }

.glow {
  position: absolute;
  width: 46vmax; height: 46vmax;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.16;
  animation: glow-drift 26s ease-in-out infinite alternate;
}
.glow-1 { background: radial-gradient(circle, var(--cyan), transparent 65%); top: -18vmax; left: -12vmax; }
.glow-2 { background: radial-gradient(circle, var(--magenta), transparent 65%); bottom: -20vmax; right: -14vmax; animation-delay: -13s; }

@keyframes glow-drift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to   { transform: translate3d(6vmax, 4vmax, 0) scale(1.15); }
}

.scanlines {
  position: absolute; inset: -50%;
  background: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.028) 0 1px,
    transparent 1px 4px
  );
  mix-blend-mode: overlay;
  animation: scan-drift 9s linear infinite;
}

@keyframes scan-drift {
  from { transform: translateY(-4px); }
  to   { transform: translateY(4px); }
}

@media (prefers-reduced-motion: reduce) {
  .glow, .scanlines { animation: none; }
}

/* ---------------- 布局骨架 ---------------- */

.wrap { width: min(1080px, 100% - 32px); margin-inline: auto; }

main.wrap { padding: 26px 0 60px; min-height: 60vh; }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
p { line-height: 1.65; }

.mono { font-family: var(--font-mono); }

.glass {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

/* ---------------- 顶栏 ---------------- */

.site-head {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--line);
}

.head-inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 62px; padding-block: 8px; flex-wrap: wrap;
}

.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.5)); }
.brand-name { font-size: 19px; font-weight: 600; letter-spacing: .2px; }
.brand-name b { color: var(--cyan); text-shadow: 0 0 12px rgba(0, 240, 255, 0.6); }
.brand-name i { font-style: normal; color: var(--text-faint); font-size: 13px; }

.head-nav { display: flex; gap: 4px; flex: 1; min-width: 0; overflow-x: auto; }
.nav-link {
  color: var(--text-dim); padding: 8px 14px; border-radius: 999px;
  white-space: nowrap; font-size: 14.5px; transition: color .15s, background .15s;
}
.nav-link:hover { color: var(--text); background: var(--panel); text-decoration: none; }
/* 四种模式链接：稍小一号与主链接区分 */
.nav-link.nav-mode { font-size: 13.5px; color: var(--text-faint); }
.nav-link.nav-mode:hover { color: var(--text); }
/* 当前页导航高亮 */
.nav-link.is-active { color: var(--cyan); background: var(--cyan-soft); }

/* 中宽度（带 6 个导航链接的空间收紧） */
@media (max-width: 1100px) {
  .head-inner { gap: 10px; }
  .nav-link { padding: 8px 10px; font-size: 13.5px; }
  .nav-link.nav-mode { padding: 8px 9px; font-size: 12.5px; }
  .user-chip { max-width: 110px; }
}

.head-side { display: flex; align-items: center; gap: 8px; }

.user-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  background: var(--cyan-soft); border: 1px solid color-mix(in srgb, var(--cyan) 25%, transparent);
  font-size: 13.5px; max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.user-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 8px var(--lime); flex: none; }

/* ---------------- 游戏页模式切换条 ---------------- */

.mode-switch {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  justify-content: center;
  margin: 0 auto 18px;
  max-width: 720px;
}
.ms-label { color: var(--text-faint); font-size: 13px; }
.ms-link {
  padding: 7px 16px; border-radius: 999px;
  color: var(--text-dim); font-size: 13.5px; font-weight: 600;
  transition: color var(--move-ms) ease, border-color var(--move-ms) ease, box-shadow var(--move-ms) ease;
}
.ms-link:hover { color: var(--text); text-decoration: none; }
.ms-link.is-active {
  color: var(--cyan);
  border-color: color-mix(in srgb, var(--cyan) 45%, transparent);
  box-shadow: 0 0 12px color-mix(in srgb, var(--cyan) 18%, transparent);
}

/* 深浅色切换按钮 */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--btn-bg);
  color: var(--text-dim); cursor: pointer; padding: 0;
  transition: color var(--move-ms) ease, border-color var(--move-ms) ease, transform var(--move-ms) ease;
}
.theme-toggle:hover { color: var(--amber); border-color: var(--line-strong); transform: rotate(14deg); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* 语言下拉 */
.lang-picker { position: relative; }
.lang-picker summary {
  list-style: none; cursor: pointer; user-select: none;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); color: var(--text-dim); font-size: 13.5px;
}
.lang-picker summary::-webkit-details-marker { display: none; }
.lang-picker[open] summary { color: var(--cyan); border-color: color-mix(in srgb, var(--cyan) 40%, transparent); }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  margin: 0; padding: 6px; list-style: none; min-width: 150px; z-index: 60;
}
.lang-menu a {
  display: block; padding: 8px 12px; border-radius: 9px;
  color: var(--text-dim); font-size: 14px;
}
.lang-menu a:hover { background: var(--panel); color: var(--text); text-decoration: none; }
.lang-menu a.is-active { color: var(--cyan); background: var(--cyan-soft); }

/* ---------------- 按钮 ---------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 18px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--btn-bg);
  color: var(--text); font-size: 14.5px; font-family: inherit; font-weight: 600;
  cursor: pointer; white-space: nowrap;
  transition: transform var(--move-ms) ease, box-shadow var(--move-ms) ease, background var(--move-ms) ease, border-color var(--move-ms) ease;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

.btn-primary {
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.22), rgba(0, 240, 255, 0.08));
  background: linear-gradient(135deg, color-mix(in srgb, var(--cyan) 22%, transparent), color-mix(in srgb, var(--cyan) 8%, transparent));
  border-color: color-mix(in srgb, var(--cyan) 55%, transparent);
  color: var(--cyan);
  box-shadow: 0 0 14px color-mix(in srgb, var(--cyan) 18%, transparent);
}
.btn-primary:hover { box-shadow: var(--shadow-neon); border-color: var(--cyan); }

.btn-ghost:hover { background: var(--btn-bg-hover); }

.btn-lg { padding: 13px 30px; font-size: 16.5px; border-radius: 14px; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-block { width: 100%; }

.linklike {
  background: none; border: 0; padding: 4px 2px; cursor: pointer;
  color: var(--cyan); font: inherit; font-size: 14px;
}
.linklike:hover { text-decoration: underline; }

/* ---------------- Hero + 首页内嵌经典模式 ---------------- */

.hero-play {
  position: relative;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 600px);
  gap: clamp(20px, 4vw, 52px);
  align-items: center;
  padding: clamp(14px, 3vw, 40px) 0 clamp(20px, 3.5vw, 44px);
}

.hero-copy { position: relative; text-align: left; min-width: 0; }
.hero-copy .hero-title { font-size: clamp(68px, 10vw, 132px); }
.hero-copy .hero-sub { margin: 8px 0 24px; max-width: 460px; }
.hero-copy .hero-cta { justify-content: flex-start; }

.hero-playnow {
  display: inline-block;
  margin-top: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--lime) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--lime) 35%, transparent);
  color: var(--lime);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .5px;
}

.hero-board { min-width: 0; }

@media (max-width: 940px) {
  .hero-play { grid-template-columns: 1fr; padding-top: 10px; }
  .hero-copy { text-align: center; }
  .hero-copy .hero-sub { margin-inline: auto; }
  .hero-copy .hero-cta { justify-content: center; }
  .hero-board { width: 100%; max-width: 560px; margin: 0 auto; }
  /* 窄屏下装饰方块避开文字 */
  .hero-tiles .ht { opacity: .22; }
}

.hero-title {
  font-size: clamp(72px, 18vw, 168px);
  margin: 0; font-weight: 800; letter-spacing: 2px;
  background: linear-gradient(120deg, var(--cyan) 10%, #7df9ff 35%, var(--magenta) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 24px rgba(0, 240, 255, 0.35));
}
.hero-sub { color: var(--text-dim); font-size: clamp(15px, 2.4vw, 19px); margin: 10px auto 26px; max-width: 560px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-online { margin-top: 18px; color: var(--text-faint); font-size: 13px; letter-spacing: 1.5px; }

.hero-tiles { position: absolute; inset: 0; pointer-events: none; z-index: -1; }
.ht {
  position: absolute; display: grid; place-items: center;
  font-family: var(--font-mono); font-weight: 700;
  border-radius: 14px; opacity: .8;
  animation: ht-float 7s ease-in-out infinite alternate;
}
.ht-2  { width: 56px; height: 56px; font-size: 22px; left: 8%;  top: 16%; color: #052a2e; background: linear-gradient(145deg, #7de8f5, #2ec9dd); }
.ht-4  { width: 44px; height: 44px; font-size: 18px; right: 12%; top: 12%; color: #04222b; background: linear-gradient(145deg, #56e6ff, #00c2e8); animation-delay: -2s; }
.ht-8  { width: 40px; height: 40px; font-size: 16px; left: 16%; bottom: 6%; color: #eaf6ff; background: linear-gradient(145deg, #4f8dff, #2f5fe0); animation-delay: -4s; }
.ht-16 { width: 50px; height: 50px; font-size: 18px; right: 8%;  bottom: 14%; color: #ffe9fb; background: linear-gradient(145deg, #e46bff, #b029e8); animation-delay: -1s; }
.ht-32 { width: 34px; height: 34px; font-size: 14px; right: 30%; top: 4%; color: #fff; background: linear-gradient(145deg, #ff5fae, #e02f86); animation-delay: -5s; }
.ht-64 { width: 36px; height: 36px; font-size: 14px; left: 34%; bottom: 2%; color: #2b1600; background: linear-gradient(145deg, #ffd36b, #ffa42e); animation-delay: -3s; }

@keyframes ht-float {
  from { transform: translateY(-8px) rotate(-3deg); }
  to   { transform: translateY(10px) rotate(4deg); }
}

/* ---------------- 章节与模式卡片 ---------------- */

.section-title {
  font-size: clamp(20px, 3vw, 26px); font-weight: 700; margin-bottom: 18px;
}

.modes { margin-top: clamp(24px, 5vw, 56px); }
.mode-grid {
  display: grid; gap: 16px;
  grid-template-columns: repeat(4, 1fr);
}
@media (max-width: 960px) { .mode-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .mode-grid { grid-template-columns: 1fr; } }

.mode-card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  padding: 22px 20px 18px; color: var(--text); overflow: hidden;
  transition: transform var(--move-ms) ease, box-shadow var(--move-ms) ease, border-color var(--move-ms) ease;
}
.mode-card:hover { transform: translateY(-4px); text-decoration: none; }
.mode-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2.5px;
  background: var(--accent, var(--cyan));
  box-shadow: 0 0 12px var(--accent, var(--cyan));
}
.mode-classic  { --accent: var(--cyan); }
.mode-standard { --accent: var(--amber); }
.mode-tutorial { --accent: var(--lime); }
.mode-plus     { --accent: var(--magenta); }
.mode-card:hover { box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45), 0 0 22px color-mix(in srgb, var(--accent, var(--cyan)) 22%, transparent); }

.mode-tag {
  align-self: flex-start; font-size: 11.5px; letter-spacing: 1px;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  padding: 3px 9px; border-radius: 999px; background: color-mix(in srgb, var(--accent) 9%, transparent);
}
.mode-icon { width: 44px; height: 44px; }
.mode-icon svg { width: 100%; height: 100%; fill: var(--accent); stroke: var(--accent); filter: drop-shadow(0 0 8px color-mix(in srgb, var(--accent) 55%, transparent)); }
.mode-name { margin: 2px 0 0; font-size: 19px; }
.mode-desc { margin: 0; color: var(--text-dim); font-size: 13.8px; flex: 1; }
.mode-play { color: var(--accent); font-size: 13.5px; font-weight: 600; }

/* ---------------- 排行榜面板 ---------------- */

.lb-preview { margin-top: clamp(24px, 5vw, 56px); }
.lb-panel { padding: 22px 22px 18px; }
.lb-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.lb-head .section-title { margin-bottom: 10px; }

.lb-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.lb-table th {
  text-align: left; font-weight: 600; color: var(--text-faint);
  font-size: 12.5px; letter-spacing: .8px; text-transform: uppercase;
  padding: 8px 10px; border-bottom: 1px solid var(--line);
}
.lb-table td { padding: 10px; border-bottom: 1px solid var(--row-line); }
.lb-table tbody tr:last-child td { border-bottom: 0; }
.lb-table tbody tr { transition: background var(--move-ms) ease; }
.lb-table tbody tr:hover { background: var(--row-hover); }
/* 当前用户行：红色加粗突出 */
.lb-table tbody tr.is-me {
  background: color-mix(in srgb, var(--danger) 10%, transparent);
  box-shadow: inset 3px 0 0 var(--danger);
}
.lb-table tbody tr.is-me td { font-weight: 700; }
.lb-table tbody tr.is-me td.col-name,
.lb-table tbody tr.is-me td.col-num { color: var(--danger); }

.col-rank { width: 64px; }
.col-num { text-align: right !important; }
.rank-badge {
  display: inline-grid; place-items: center; width: 28px; height: 28px;
  border-radius: 8px; font-family: var(--font-mono); font-weight: 700; font-size: 13px;
  background: var(--badge-bg); color: var(--text-dim);
}
.rank-1 { background: linear-gradient(145deg, #ffe27a, #ffb03c); color: #2b1600; box-shadow: 0 0 12px rgba(255, 176, 60, 0.55); }
.rank-2 { background: linear-gradient(145deg, #e6eef8, #9fb2c8); color: #1a2330; }
.rank-3 { background: linear-gradient(145deg, #ffb08a, #d97a4a); color: #2b1000; }
.col-name { max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 玩家地区国旗（emoji；Windows 桌面浏览器降级为字母对） */
.lb-flag {
  display: inline-block;
  margin-right: 7px;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
  transform: translateY(-1px);
}

.lb-empty { color: var(--text-faint); text-align: center; padding: 26px 10px !important; }

/* ---------------- 特性卡片 ---------------- */

.features {
  margin-top: clamp(24px, 5vw, 56px);
  display: grid; gap: 16px; grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 800px) { .features { grid-template-columns: 1fr; } }
.feature-card { padding: 22px; }
.feature-card h3 { font-size: 16.5px; color: var(--cyan); }
.feature-card p { margin: 0; color: var(--text-dim); font-size: 13.8px; }

/* ---------------- FAQ（SEO/GEO） ---------------- */

.faq { margin-top: clamp(24px, 5vw, 56px); margin-inline: auto; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item { padding: 0; overflow: hidden; }
.faq-item summary {
  list-style: none; cursor: pointer; user-select: none;
  padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  transition: color var(--move-ms) ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary h3 {
  margin: 0; font-size: 15.5px; font-weight: 600; color: var(--text);
}
.faq-item summary::after {
  content: "+"; flex: none;
  font-size: 20px; color: var(--cyan); font-family: var(--font-mono);
  transition: transform var(--move-ms) ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary:hover h3 { color: var(--cyan); }
.faq-item p {
  margin: 0; padding: 0 20px 18px;
  color: var(--text-dim); font-size: 14px; line-height: 1.8;
}

/* ---------------- 底栏 ---------------- */

.site-foot { border-top: 1px solid var(--line); padding: 26px 0 34px; margin-top: 20px; }
.foot-inner { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.foot-rights { margin: 0; color: var(--text-dim); font-size: 13.5px; }
.foot-disclaimer { margin: 4px 0 0; color: var(--text-faint); font-size: 12.5px; }
.foot-links { display: flex; align-items: center; gap: 12px; color: var(--text-faint); font-size: 13px; flex-wrap: wrap; }
.foot-links a { color: var(--text-dim); }
.foot-links a:hover { color: var(--cyan); }

/* ---------------- 弹窗 ---------------- */

.modal { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 20px; }
.modal.hidden, .hidden { display: none !important; }
.modal-mask { position: absolute; inset: 0; background: var(--mask-bg); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); animation: fade-in .2s ease; }
.modal-box {
  position: relative; width: min(400px, 100%);
  padding: 26px 26px 20px;
  background: var(--panel-strong);
  animation: pop-in .22s cubic-bezier(.34, 1.56, .64, 1);
}
.modal-close {
  position: absolute; top: 10px; right: 12px;
  background: none; border: 0; color: var(--text-faint);
  font-size: 24px; line-height: 1; cursor: pointer; padding: 4px 8px;
}
.modal-close:hover { color: var(--text); }
.modal-box h3 { font-size: 20px; margin-bottom: 16px; }

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes pop-in { from { opacity: 0; transform: scale(.92) translateY(8px); } to { opacity: 1; transform: none; } }

.field { display: block; margin-bottom: 12px; }
.field span { display: block; font-size: 12.5px; color: var(--text-dim); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--input-bg);
  color: var(--text); font: inherit; font-size: 14.5px; outline: none;
  transition: border-color var(--move-ms) ease, box-shadow var(--move-ms) ease;
}
.field input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 15%, transparent); }

.anon-note { font-size: 12.5px; color: var(--text-faint); margin: 4px 0 10px; }
.auth-error { color: var(--danger); font-size: 13px; min-height: 18px; margin: 0 0 8px; }
.auth-info { color: var(--lime); font-size: 12.5px; margin: 0 0 8px; }
#auth-form .btn-block { margin-top: 2px; }
#auth-switch { display: block; margin: 14px auto 0; }

/* 验证码输入行：验证码输入框 + 发送按钮 */
.code-row { display: flex; gap: 8px; }
.code-row input {
  flex: 1; min-width: 0;
  padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--input-bg);
  color: var(--text); font: inherit; font-size: 16px; letter-spacing: 4px;
  font-family: var(--font-mono); outline: none;
  transition: border-color var(--move-ms) ease, box-shadow var(--move-ms) ease;
}
.code-row input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px color-mix(in srgb, var(--cyan) 15%, transparent); }
.btn-send { flex: none; min-width: 96px; font-size: 13px; padding: 9px 10px; }
.btn-send:disabled { opacity: .55; }

.auth-switches {
  display: flex; justify-content: center; align-items: center; gap: 6px;
  flex-wrap: wrap; margin-top: 14px;
}
.auth-switches .sep { color: var(--text-faint); }
.auth-switches .linklike { font-size: 13px; color: var(--text-dim); }
.auth-switches .linklike:hover, .auth-switches .linklike.is-active { color: var(--cyan); }

/* ---------------- 分段选择器（排行榜页） ---------------- */

.lb-page { margin: 0 auto; }
.lb-full { margin-top: 4px; }
.lb-controls {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px;
}
.seg { display: inline-flex; gap: 4px; background: var(--seg-bg); padding: 4px; border-radius: 12px; border: 1px solid var(--line); }
.seg-btn {
  border: 0; background: transparent; color: var(--text-dim);
  font: inherit; font-size: 13.5px; font-weight: 600;
  padding: 7px 14px; border-radius: 9px; cursor: pointer;
  transition: background var(--move-ms) ease, color var(--move-ms) ease;
}
.seg-btn:hover { color: var(--text); }
.seg-btn.is-active { background: var(--cyan-soft); color: var(--cyan); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--cyan) 35%, transparent); }

.lb-scroll { overflow-x: auto; }
.lb-mine {
  margin-top: 12px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: var(--cyan-soft); border: 1px solid color-mix(in srgb, var(--cyan) 30%, transparent);
  color: var(--cyan); font-size: 14px; font-weight: 600;
}
.lb-pager { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 16px; }
.lb-page-ind { color: var(--text-dim); font-size: 13.5px; }

/* ---------------- 404 ---------------- */

.nf-page { display: grid; place-items: center; padding: 60px 0; }
.nf-box { text-align: center; padding: 44px 52px; }
.nf-code { font-size: 64px; font-weight: 800; margin: 0; color: var(--cyan); text-shadow: 0 0 26px rgba(0, 240, 255, 0.5); }
.nf-title { font-size: 24px; }
.nf-text { color: var(--text-dim); margin-bottom: 22px; }

/* ---------------- 管理后台 ---------------- */

.admin-page { max-width: 980px; margin: 0 auto; }
.admin-hint { color: var(--text-dim); font-size: 13.5px; margin: -6px 0 18px; }
.admin-actions { white-space: nowrap; }
.admin-actions .btn + .btn { margin-left: 6px; }
tr.is-done { opacity: .35; pointer-events: none; }

/* ---------------- Toast 提示 ---------------- */

.toast {
  position: fixed; left: 50%; bottom: 34px; transform: translate(-50%, 16px);
  z-index: 200; padding: 12px 22px;
  background: var(--panel-strong); color: var(--text);
  font-size: 14px; opacity: 0; pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 技能选项（旋转/炸弹 行列选择） ---------------- */

.prompt-choices { display: inline-flex; gap: 8px; align-items: center; }

/* ---------------- 移动端微调 ---------------- */

@media (max-width: 720px) {
  .head-inner { gap: 10px; }
  /* 移动端隐藏顶部导航链接（首页/排行榜）与语言下拉，入口保留在页脚与页面内容中 */
  .head-nav { display: none; }
  .lang-picker { display: none; }
  .head-side { margin-left: auto; }
  .btn { padding: 8px 14px; font-size: 13.5px; }
  .btn-lg { padding: 12px 22px; font-size: 15px; }
  .lb-panel { padding: 16px 14px; }
  .lb-controls { flex-direction: column; }
  .col-name { max-width: 120px; }

  /* 模式切换条：隐藏标签，4 个模式按钮一行均匀分布 */
  .mode-switch { gap: 6px; margin-bottom: 14px; }
  .mode-switch .ms-label { display: none; }
  .mode-switch .ms-link {
    flex: 1 1 0;
    text-align: center;
    padding: 8px 4px;
    font-size: 13px;
    white-space: nowrap;
  }
}