/* GAME LAB 共享版式：首页、404、persona 索引页共用一套排版语言。
   黑白灰极简 + 纯CSS液态玻璃（逐值照搬 E:\Code\yzrt\纯CSS液态玻璃\css\styles.css）：
     1. 五层 inset 高光/暗边 box-shadow（原封不动，外投影已去掉）
     2. border: 1px double rgba(51,51,51,0.08)
     3. background rgba(255,255,255,0.04) + backdrop-filter blur(2px)
     4. ::after 45° 双端白高光（端点 25% / blur 3px）——唯一保留的伪元素层
   玻璃常驻，不依赖 :hover 触发；hover 只做 1~2px 的位移，不加特效层。
   折射暗环（原版 ::before blur(8px) 黑描边）已移除：那圈柔化暗晕属于"背后的模糊阴影"。
   背景两层：分区主题背景图（每区一张）→ 玻璃组件。
   两套配色（暗/亮）通过 data-theme 切换，未设置时跟随系统 prefers-color-scheme。
   主题切换是一枚灯泡开关，造型取自 CodePen "Pure CSS Bulb Switch"（Wujek_Greg）。 */

:root {
  /* ========== 暗色 D ========== */
  --d-bg: #0c0c0e;
  --d-ink: #f2efe9;
  --d-ink-2: #a8a49c;
  --d-ink-3: #6a6760;
  --d-line: rgba(242, 239, 233, 0.10);
  --d-line-2: rgba(242, 239, 233, 0.22);
  --d-accent: #d8d4cb;              /* 全站去红：accent 即浅灰 */
  --d-card-bg: rgba(255, 255, 255, 0.03);
  --d-glass-border: rgba(255, 255, 255, 0.16);
  --d-sec-img-o: 0.55;

  /* ========== 亮色 L ========== */
  --l-bg: #ffffff;
  --l-ink: #1a1a18;
  --l-ink-2: #55524a;
  --l-ink-3: #8a857a;
  --l-line: rgba(23, 23, 15, 0.10);
  --l-line-2: rgba(23, 23, 15, 0.22);
  --l-accent: #1a1a18;
  --l-card-bg: rgba(255, 255, 255, 0.55);
  --l-glass-border: rgba(51, 51, 51, 0.08);
  --l-sec-img-o: 0.12;

  /* ========== 液态玻璃 · 原版数值（两主题共用）==========
     五层 inset 是 yzrt 原封不动的；折射暗环（原版 ::before blur(8px) 黑描边）已移除。
     外投影（原版 0 4px 8px rgba(0,0,0,.2)）此前已按要求去掉。 */
  --glass:
    inset 2px -2px 1px -1px rgba(255, 255, 255, 0.9),
    inset -2px 2px 1px -1px rgba(255, 255, 255, 0.9),
    inset 6px -6px 1px -6px rgba(255, 255, 255, 0.55),
    inset -6px 6px 1px -6px rgba(255, 255, 255, 0.55),
    inset 0 0 2px rgba(0, 0, 0, 0.8);
  /* 小号（药丸按钮）：整体按比例缩 */
  --glass-sm:
    inset 1px -1px 1px -1px rgba(255, 255, 255, 0.9),
    inset -1px 1px 1px -1px rgba(255, 255, 255, 0.9),
    inset 4px -4px 1px -5px rgba(255, 255, 255, 0.55),
    inset -4px 4px 1px -5px rgba(255, 255, 255, 0.55),
    inset 0 0 2px rgba(0, 0, 0, 0.8);
  --glass-bg: rgba(255, 255, 255, 0.04);
  --glass-blur: blur(2px);
  --glass-sheen: rgba(255, 255, 255, 0.8);

  /* ========== 默认映射：暗色 ========== */
  color-scheme: dark;
  --bg: var(--d-bg);
  --ink: var(--d-ink);
  --ink-2: var(--d-ink-2);
  --ink-3: var(--d-ink-3);
  --line: var(--d-line);
  --line-2: var(--d-line-2);
  --accent: var(--d-accent);
  --card-bg: var(--d-card-bg);
  --glass-border: var(--d-glass-border);
  --sec-img-o: var(--d-sec-img-o);

  /* 交互特效：指针光斑 + 点击涟漪（暗色默认） */
  --spot-c: rgba(255, 255, 255, 0.10);
  --ripple-c: rgba(255, 255, 255, 0.45);

  --serif: "Times New Roman", "Songti SC", "Noto Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Courier New", monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --pad: clamp(20px, 5vw, 64px);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: var(--l-bg); --ink: var(--l-ink); --ink-2: var(--l-ink-2); --ink-3: var(--l-ink-3);
  --line: var(--l-line); --line-2: var(--l-line-2); --accent: var(--l-accent);
  --card-bg: var(--l-card-bg);
  --glass-border: var(--l-glass-border); --sec-img-o: var(--l-sec-img-o);
  /* 交互特效：亮色下的光斑/涟漪用墨色，避免过曝 */
  --spot-c: rgba(0, 0, 0, 0.06);
  --ripple-c: rgba(0, 0, 0, 0.14);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: var(--l-bg); --ink: var(--l-ink); --ink-2: var(--l-ink-2); --ink-3: var(--l-ink-3);
    --line: var(--l-line); --line-2: var(--l-line-2); --accent: var(--l-accent);
    --card-bg: var(--l-card-bg);
    --glass-border: var(--l-glass-border); --sec-img-o: var(--l-sec-img-o);
    --spot-c: rgba(0, 0, 0, 0.06);
    --ripple-c: rgba(0, 0, 0, 0.14);
  }
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: color .6s var(--ease), background-color .6s var(--ease);
}
/* 纯色底：格子线已移除，玻璃的层次交给分区背景图与自身明暗 */
body { background-color: var(--bg); }
::selection { background: var(--ink); color: var(--bg); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--ink-3); outline-offset: 4px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* ============ 液态玻璃（原版照搬，常驻）============
   本体 ：五层原版 inset + double 边框 + blur(2px)
   ::after  45° 双端白高光（透明段 25%~75%）、blur(3px)、最上层 = 液态感
   折射暗环（原版 ::before blur(8px)）已删：那圈柔化暗晕是"背后的模糊阴影"。 */
.glass, .card, .row {
  position: relative;
  isolation: isolate;
  border: 1px double var(--glass-border);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass);
}
.glass::after, .card::after, .row::after {
  content: ''; position: absolute; z-index: 4; pointer-events: none; inset: 0;
  border-radius: inherit;
  filter: blur(3px);
  background: linear-gradient(45deg,
    var(--glass-sheen) 0%,
    transparent 25%,
    transparent 75%,
    var(--glass-sheen) 100%);
}
/* 卡片正文：置于玻璃本体与 ::after 高光之间，保证文字清晰 */
.card > *, .row > * { position: relative; z-index: 2; }

/* 卡片目前均为纯文字，封面图样式已省略 */
/* 分类标签：浮在卡身顶部左端的玻璃药丸 */
.card-tag {
  z-index: 3; align-self: flex-start;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink);
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  padding: 4px 9px; border-radius: 100px;
}
/* 精选卡：更高的卡身，无封面 */
.card-feat { min-height: 240px; }
/* 次要条目：维持紧凑的文字行 */

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 var(--pad); }

/* ============ 顶栏 ============ */
/* position + z-index 不可省：hero 的背景层向上扩张 40px，作为定位元素
   会绘制在 static 的顶栏之上，没有这层就会把按钮的点击全部截胡。 */
.topbar {
  position: relative; z-index: 10;
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 26px 0 0; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3);
}
.topbar a { color: var(--ink-3); text-decoration: none; border-bottom: 1px solid transparent; transition: color .4s var(--ease), border-color .4s var(--ease); }
.topbar a:hover { color: var(--ink); border-color: var(--line-2); }
/* 品牌字标：左上角 Logo，点回首页 */
.topbar .brand { color: var(--ink); font-family: var(--mono); font-size: 13px; font-weight: 600; letter-spacing: 0.22em; text-transform: uppercase; text-decoration: none; display: inline-flex; align-items: center; gap: 9px; }
.topbar .brand:hover { color: var(--ink); border-color: transparent; }
.topbar .brand-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink); box-shadow: 0 0 0 3px rgba(140, 140, 150, 0.18); }
/* ============ 语言切换：玻璃胶囊滑钮（与灯泡开关同风格）============
   轨道 = 液态玻璃胶囊；旋钮在「中 / EN」两格间滑动；
   位置由 <html data-lang> 驱动（en = 右移），活动侧标签提亮。 */
.lang-switch {
  --ls-w: 60px; --ls-h: 28px; --ls-pad: 3px;
  flex: 0 0 auto; width: var(--ls-w); height: var(--ls-h);
  padding: 0; border: 0; background: transparent; cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.ls-track {
  position: relative; display: block; width: 100%; height: 100%;
  border-radius: 999px; border: 1px double var(--glass-border);
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-sm);
}
.ls-opt {
  position: absolute; top: 0; height: 100%; width: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em;
  color: var(--ink-3); z-index: 2; pointer-events: none;
  transition: color .4s var(--ease);
}
.ls-zh { left: 0; }
.ls-en { right: 0; }
.ls-knob {
  position: absolute; top: var(--ls-pad); left: var(--ls-pad);
  width: calc(50% - var(--ls-pad)); height: calc(100% - 2 * var(--ls-pad));
  border-radius: 999px; z-index: 1;
  background: rgba(255, 255, 255, 0.10);
  box-shadow: var(--glass-sm);
  transition: left .5s var(--ease), background-color .4s var(--ease);
}
:root:not([data-lang="en"]) .ls-zh { color: var(--ink); }
:root[data-lang="en"] .ls-en { color: var(--ink); }
:root[data-lang="en"] .ls-knob { left: calc(50% + var(--ls-pad)); }

/* ============ 主题切换：灯泡开关 ============
   造型与点亮逻辑参考 CodePen "Pure CSS Bulb Switch"
   （Wujek_Greg，https://codepen.io/Wujek_Greg/pen/Bqvzbp）：
   灯泡坐在胶囊轨道里，熄灭时靠左、点亮时滑到右端并甩出四点火花。
   原版由 checkbox :checked 驱动，这里改由 <html data-theme> 驱动
   （暗 = 熄灭 / 亮 = 点亮），配色压进站点的黑白灰，暖黄只留一点点。
   尺寸按原版 90px 灯泡 : 24px 整比缩放，弧线类描边提到 1px 保证可见。 */
.bulb-switch {
  --bs-w: 56px; --bs-h: 28px; --bs-bulb: 24px; --bs-pad: 3px;
  --bs-speed: .55s;
  /* —— 熄灭（暗色主题）：冷灰，区分明显但不刺眼 —— */
  --bulb-glass: #82828c;
  --bulb-rim:   #9e9ea8;
  --bulb-deep:  #5e5e66;
  --bulb-core:  #aaaaae;
  --bulb-ring:  #b8b8c0;
  --bulb-hot:   #cacace;
  --bulb-glow:  rgba(0, 0, 0, 0.16);
  --bulb-fil:   #9c9ca4;
  --bulb-halo:  rgba(0, 0, 0, 0);
  --bulb-drop:  rgba(0, 0, 0, 0.28);
  --bs-x: var(--bs-pad);

  flex: 0 0 auto; width: var(--bs-w); height: var(--bs-h);
  padding: 0; border: 0; background: transparent; cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
/* 轨道：一枚液态玻璃胶囊 */
.bs-track {
  position: relative; display: block; width: 100%; height: 100%;
  border-radius: 999px;
  border: 1px double var(--glass-border);
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--glass-sm);
}
/* 玻璃泡（垂直居中于轨道） */
.bs-bulb {
  position: absolute; top: 50%; left: var(--bs-x); transform: translateY(-50%);
  width: var(--bs-bulb); height: var(--bs-bulb);
  border-radius: 50%; display: block;
  background: var(--bulb-glass);
  box-shadow:
    inset 0 0 1px 0.8px var(--bulb-rim),
    inset 0 0 6px 2px var(--bulb-deep),
    0 3px 6px -2px var(--bulb-drop),
    0 0 8px 13px var(--bulb-halo);
  transition: left var(--bs-speed) var(--ease),
              background-color var(--bs-speed) var(--ease),
              box-shadow var(--bs-speed) var(--ease);
}
/* 泡心：点亮时这里先亮 */
.bs-center {
  position: absolute; top: 50%; left: 50%;
  width: 10px; height: 10px; border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--bulb-core);
  box-shadow: inset 0 0 0 1px var(--bulb-ring);
  transition: background-color var(--bs-speed) var(--ease),
              box-shadow var(--bs-speed) var(--ease);
}
.bs-center::after {
  content: ''; position: absolute; top: 50%; left: 50%;
  width: 4px; height: 4px; border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--bulb-hot);
  box-shadow: 0 0 2px 1px var(--bulb-glow);
  transition: background-color var(--bs-speed) var(--ease),
              box-shadow var(--bs-speed) var(--ease);
}
/* 灯丝：两个错开 45° 的圆环各取两段弧 */
.bs-f1, .bs-f2 {
  position: absolute; top: 50%; left: 50%;
  width: 9px; height: 9px; border-radius: 50%; overflow: hidden;
  transform: translate(-50%, -50%) rotate(-45deg);
}
.bs-f2 { transform: translate(-50%, -50%) rotate(45deg); }
.bs-f1::before, .bs-f1::after,
.bs-f2::before, .bs-f2::after {
  content: ''; position: absolute; display: block;
  width: 4.6px; height: 1.8px; border-radius: 50%;
  border: 1px solid var(--bulb-fil);
  top: -0.4px; left: -0.5px;
  transform: rotate(-10deg);
  transition: border-color var(--bs-speed) var(--ease);
}
.bs-f1::before, .bs-f2::before { left: 4.2px; transform: rotate(10deg); }
/* 玻璃反射：一道斜向高光 + 底部一道细亮边 */
.bs-refl {
  position: absolute; inset: 0; display: block; border-radius: 50%;
  overflow: hidden; z-index: 3; pointer-events: none; perspective: 19px;
}
.bs-refl > span {
  position: absolute; width: 21px; height: 21px; border-radius: 50%;
  left: -10.7px; bottom: -12px;
  background-image: linear-gradient(-135deg, transparent 10%, rgba(255, 255, 255, 0.3));
}
.bs-refl > span::after {
  content: ''; position: absolute;
  width: 5.3px; height: 9.3px; border-radius: 50%;
  top: -9.6px; right: -10.7px;
  box-shadow: 1px -0.5px 0 -1px rgba(255, 255, 255, 0.4);
  filter: blur(1px); transform: rotate(-10deg);
}
.bs-refl::after {
  content: ''; position: absolute;
  width: 13px; height: 21px;
  background-image: linear-gradient(80deg, rgba(255, 255, 255, 0.05) 45%, rgba(255, 255, 255, 0.5));
  border-radius: 10% 20% 50% 30% / 30% 60% 30% 40%;
  top: -2.1px; left: -1.3px;
  transform-style: preserve-3d;
  transform: rotateX(-25deg) rotate(-35deg) skewX(-15deg) translate(2.7px, -5.3px);
}
.bs-refl::before {
  content: ''; position: absolute;
  width: 8px; height: 2.7px;
  background-image: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.15));
  bottom: 2.7px; right: 0; transform: rotate(45deg);
}
/* 火花：点亮瞬间从泡壁甩出去 */
.bs-sparks { position: absolute; inset: 0; pointer-events: none; }
.bs-sparks i {
  position: absolute; display: block;
  width: 2px; height: 2px; border-radius: 50%;
  background: #d8bd57; opacity: 0;
}
.bs-sparks .s1 { right: -1px; bottom: 6px; }
.bs-sparks .s2 { right: 5px; bottom: 21px; }
.bs-sparks .s3 { left: 5px; bottom: 21px; }
.bs-sparks .s4 { left: 5px; bottom: 5px; }

/* —— 点亮（亮色主题）—— */
:root[data-theme="light"] .bulb-switch {
  --bs-x: calc(var(--bs-w) - var(--bs-bulb) - var(--bs-pad));
  --bulb-glass: #ecd9a4;
  --bulb-rim:   #cbb77e;
  --bulb-deep:  #d8c184;
  --bulb-core:  #feed6b;
  --bulb-ring:  #fdec6a;
  --bulb-hot:   #fef401;
  --bulb-glow:  #fdb843;
  --bulb-fil:   #fef4d5;
  --bulb-halo:  rgba(253, 184, 67, 0.16);
  --bulb-drop:  rgba(120, 96, 20, 0.26);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .bulb-switch {
    --bs-x: calc(var(--bs-w) - var(--bs-bulb) - var(--bs-pad));
    --bulb-glass: #ecd9a4;
    --bulb-rim:   #cbb77e;
    --bulb-deep:  #d8c184;
    --bulb-core:  #feed6b;
    --bulb-ring:  #fdec6a;
    --bulb-hot:   #fef401;
    --bulb-glow:  #fdb843;
    --bulb-fil:   #fef4d5;
    --bulb-halo:  rgba(253, 184, 67, 0.16);
    --bulb-drop:  rgba(120, 96, 20, 0.26);
  }
}
:root[data-theme="light"] .bs-sparks .s1 { animation: bs-spark1 2s ease-in-out .4s; }
:root[data-theme="light"] .bs-sparks .s2 { animation: bs-spark2 2.4s ease-in-out .4s; }
:root[data-theme="light"] .bs-sparks .s3 { animation: bs-spark3 2s ease-in-out .9s; }
:root[data-theme="light"] .bs-sparks .s4 { animation: bs-spark4 1.7s ease-in-out .9s; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .bs-sparks .s1 { animation: bs-spark1 2s ease-in-out .4s; }
  :root:not([data-theme="dark"]) .bs-sparks .s2 { animation: bs-spark2 2.4s ease-in-out .4s; }
  :root:not([data-theme="dark"]) .bs-sparks .s3 { animation: bs-spark3 2s ease-in-out .9s; }
  :root:not([data-theme="dark"]) .bs-sparks .s4 { animation: bs-spark4 1.7s ease-in-out .9s; }
}
@keyframes bs-spark1 {
  0%   { right: -1px;  width: 1px; height: 1px; opacity: 0; }
  20%  { right: 0;     width: 2px; height: 2px; opacity: 1; }
  30%  { right: -1px;  width: 2px; height: 2px; opacity: 1; }
  100% { right: -16px; width: 2px; height: 2px; bottom: 10.7px; opacity: 0; }
}
@keyframes bs-spark2 {
  0%   { width: 2px;  height: 2px; opacity: 0; }
  30%  { opacity: 1; }
  100% { right: -5.3px; bottom: 26.7px; opacity: 0; }
}
@keyframes bs-spark3 {
  0%   { opacity: 0; }
  30%  { opacity: 1; width: 2px; height: 2px; }
  100% { left: 0; bottom: 26.7px; width: 3px; height: 3px; opacity: 0; }
}
@keyframes bs-spark4 {
  0%   { opacity: 0; }
  30%  { opacity: 1; width: 2px; height: 2px; }
  100% { left: -5.3px; bottom: -2.7px; width: 3px; height: 3px; opacity: 0; }
}

/* ============ HERO：仅三枚分区导航按钮，紧凑不抢版面 ============ */
.hero {
  min-height: clamp(120px, 18vh, 200px);
  display: flex; flex-direction: column; justify-content: center;
  position: relative; isolation: isolate;
  padding: clamp(20px, 4vh, 44px) 0;
}
/* 首屏背景图：给玻璃提供可折射的明暗层次 */
.hero::before {
  content: ""; position: absolute; z-index: -1; inset: -40px calc(var(--pad) * -1) -20px;
  background: url("bg/hero.jpg") center / cover no-repeat;
  opacity: var(--sec-img-o); border-radius: 40px;
  -webkit-mask-image: radial-gradient(100% 92% at 50% 36%, #000 28%, transparent 72%);
  mask-image: radial-gradient(100% 92% at 50% 36%, #000 28%, transparent 72%);
}
/* persona 子页内容不满屏，铺满的图只会成为灰块：彻底关闭 */
.hero-plain::before { display: none; }
/* 404 暗色下保留光柱，亮色下关闭 */
:root[data-theme="light"] .hero.lost::before { display: none; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .hero.lost::before { display: none; }
}

/* 动态背景：两团低对比光晕缓慢漂移，营造“活”的气息而不抢内容 */
.hero::after {
  content: ''; position: absolute; z-index: -1; inset: -12% -22%;
  pointer-events: none;
  background:
    radial-gradient(42% 52% at 22% 32%, rgba(140, 140, 160, 0.16), transparent 70%),
    radial-gradient(46% 56% at 82% 70%, rgba(120, 130, 170, 0.15), transparent 70%);
  filter: blur(22px);
  animation: heroDrift 20s ease-in-out infinite alternate;
}
@keyframes heroDrift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to   { transform: translate3d(3%, 2%, 0) scale(1.08); }
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .hero::after {
    background:
      radial-gradient(42% 52% at 22% 32%, rgba(60, 70, 110, 0.10), transparent 70%),
      radial-gradient(46% 56% at 82% 70%, rgba(90, 70, 120, 0.09), transparent 70%);
  }
}
.eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 26px; }
.lede { max-width: 46ch; font-size: 15.5px; line-height: 1.8; color: var(--ink-2); }
.lede b { color: var(--ink); font-weight: 500; }
.hero-title {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(40px, 8vw, 86px); line-height: 1.02; letter-spacing: 0.01em;
  margin-bottom: 16px;
}
.hero .lede { margin-bottom: 24px; }
.btn {
  display: inline-flex; align-items: center; gap: 12px; padding: 13px 24px;
  border-radius: 100px; color: var(--ink); background: transparent;
  text-decoration: none; font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; cursor: pointer;
  transition: background .5s var(--ease), color .5s var(--ease), box-shadow .5s var(--ease), transform .5s var(--ease);
}
.btn .ar { transition: transform .5s var(--ease); }
.btn:hover, .btn:focus-visible { transform: translateY(-1px); }
.btn:hover .ar { transform: translateX(5px); }

/* 目录：三颗独立玻璃药丸 */
.toc { display: flex; flex-wrap: wrap; gap: 14px; margin: 6px 0 10px; }
.toc a {
  display: inline-flex; gap: 10px; align-items: baseline; text-decoration: none;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-2); border-radius: 100px; padding: 12px 22px;
  transition: color .4s var(--ease), background .4s var(--ease), transform .5s var(--ease);
}
.toc a:hover, .toc a:focus-visible { transform: translateY(-1px); }
.toc em { font-style: normal; color: var(--ink-3); }

/* ============ 分区：编号 + 大标题 + 背景图 ============ */
/* 分区间距用 margin-top（板块之间），面板内留白用 padding（面板边缘→内容） */
.sec {
  margin-top: clamp(80px, 12vh, 140px);
  padding: 36px calc(var(--pad) * 0.6) 44px;
  position: relative; isolation: isolate;
  content-visibility: auto; contain-intrinsic-size: auto 640px;
}
/* 第一个板块（游戏）：与 Hero 之间的间距，等同板块之间的间距 */
.sec:first-of-type {
  margin-top: clamp(80px, 12vh, 140px);
  padding-top: 36px;
}
.sec::before {
  content: ""; position: absolute; z-index: -1; inset: -6px calc(var(--pad) * -0.6);
  background: var(--sec-img) center / cover no-repeat;
  opacity: var(--sec-img-o); border-radius: 44px;
  /* 软框（径向，四边渐隐）+ 底部纵向渐隐到完全透明（最下方消失） */
  -webkit-mask-image:
    radial-gradient(118% 104% at 50% 40%, #000 32%, transparent 80%),
    linear-gradient(to bottom, #000 56%, transparent 94%);
  -webkit-mask-composite: source-in;
  mask-image:
    radial-gradient(118% 104% at 50% 40%, #000 32%, transparent 80%),
    linear-gradient(to bottom, #000 56%, transparent 94%);
  mask-composite: intersect;
}
#games { --sec-img: url("bg/games.jpg"); }
#plays { --sec-img: url("bg/stage.jpg"); }
#sites { --sec-img: url("bg/tools.jpg"); }

.sec-head {
  display: flex; align-items: baseline; gap: 18px 22px; flex-wrap: wrap;
  padding-bottom: 14px; border-bottom: 1px solid var(--line-2);
}
.sec-idx { font-family: var(--mono); font-size: 12px; letter-spacing: 0.2em; color: var(--ink-3); }
.sec-head h2 {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(30px, 4.6vw, 46px); line-height: 1.1; letter-spacing: 0.01em;
}
.sec-head h2 .en {
  font-family: var(--mono); font-weight: 400; font-size: 11px;
  letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-3); margin-left: 16px;
}
:root[lang="en"] .sec-head h2 .en { display: none; }
.sec-count {
  margin-left: auto; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3);
}
.sec-count em { font-style: normal; color: var(--ink-2); }

/* ============ Bento 网格：块状扫视，替代一条条往下读 ============ */
.grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; margin-top: 30px; }
.card {
  grid-column: span 2;
  display: flex; flex-direction: column; justify-content: space-between; gap: 14px;
  min-height: 178px; padding: 20px 22px 16px; border-radius: 24px;
  background: var(--card-bg);
  text-decoration: none; color: inherit;
  transition: background .5s var(--ease), box-shadow .5s var(--ease), transform .5s var(--ease);
}
.card:hover, .card:focus-visible { transform: translateY(-2px); }
.card-s3 { grid-column: span 3; }
.card-s4 { grid-column: span 4; }
.card-feat { grid-row: span 2; min-height: 300px; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.card-top .card-go { margin-left: auto; }
.card-num { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em; color: var(--ink-3); }
.card:hover .card-num { color: var(--ink-2); }
.card-title { font-family: var(--serif); font-size: 21px; font-weight: 500; line-height: 1.35; }
.card-feat .card-title { font-size: clamp(26px, 3.2vw, 34px); }
.card-what {
  font-size: 13px; line-height: 1.65; color: var(--ink-2);
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.card-feat .card-what { font-size: 14px; -webkit-line-clamp: 4; }
.card-meta {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-2);
}
.card-go { font-size: 12px; transition: transform .5s var(--ease), color .4s var(--ease); }
.card:hover .card-go { transform: translateX(5px); color: var(--ink); }
/* hover 时次要文字提一档，作为唯一的 hover 反馈 */
.card:hover .card-what, .card:hover .card-meta,
.row:hover .row-what, .row:hover .row-tags, .row:hover .row-stat, .row:hover .row-num {
  color: var(--ink-2);
}
/* 次要条目：保留入口但不抢版面 */
.card.is-quiet { min-height: 0; padding: 16px 22px; }
.card.is-quiet .card-title { font-family: var(--sans); font-size: 16px; font-weight: 400; color: var(--ink-2); }
.card.is-quiet:hover .card-title { color: var(--ink); }
.card.is-quiet .card-what { -webkit-line-clamp: 1; font-size: 12.5px; }

/* ============ 条目行：persona 子页仍用 ============ */
.row {
  display: grid; grid-template-columns: 34px minmax(0,1fr) auto auto;
  gap: 0 20px; align-items: baseline;
  padding: 15px 10px 15px 4px; border-bottom: 1px solid var(--line);
  border-radius: 16px; background: transparent;
  text-decoration: none; color: inherit;
  transition: background .5s var(--ease), padding-left .5s var(--ease),
              box-shadow .5s var(--ease), border-color .5s var(--ease);
}
.row:hover, .row:focus-visible { border-bottom-color: transparent; padding-left: 12px; }
.row-num { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; color: var(--ink-3); }
.row-main { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; min-width: 0; }
.row-title { font-family: var(--serif); font-size: 19px; font-weight: 500; line-height: 1.4; }
.row-what { font-size: 13.5px; line-height: 1.5; color: var(--ink-3); }
.row-desc { display: block; max-width: 66ch; font-size: 14.5px; line-height: 1.78; color: var(--ink-2); margin-top: 12px; }
.row-tags { font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.row-side { display: flex; align-items: baseline; gap: 12px; }
.row-stat { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); white-space: nowrap; }
.row-go { font-family: var(--mono); font-size: 12px; color: var(--ink-3); transition: transform .5s var(--ease), color .4s var(--ease); }
.row:hover .row-go { color: var(--ink); transform: translateX(5px); }

/* ============ Footer ============ */
footer { margin-top: clamp(80px, 14vh, 150px); border-top: 1px solid var(--line); padding: 46px 0 60px; }
.foot-in { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; flex-wrap: wrap; }
.foot-word { font-family: var(--serif); font-size: clamp(40px, 9vw, 92px); line-height: 0.9; letter-spacing: -0.02em; color: var(--ink-2); }
.foot-meta { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); line-height: 2.2; text-align: right; }
.foot-meta a { color: var(--ink-2); text-decoration: none; border-bottom: 1px solid var(--line); transition: color .4s var(--ease), border-color .4s var(--ease); }
.foot-meta a:hover { color: var(--ink); border-color: var(--line-2); }

/* ============ 滚动揭示（仅 JS 可用时启用，无 JS 直接可见）============ */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; } }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .card, .card-s3, .card-s4, .card-feat { grid-column: auto; }
  .card-feat { grid-column: span 2; grid-row: auto; min-height: 240px; }
  .hero { align-items: flex-start; }
}
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .card, .card-s3, .card-s4, .card-feat { grid-column: 1 / -1; }
  .row { display: flex; flex-wrap: wrap; align-items: baseline; column-gap: 12px; padding: 16px 6px; }
  .row-num { flex: 0 0 auto; }
  .row > span:not(.row-num):not(.row-side) { flex: 1 1 auto; min-width: 0; }
  .row-main { display: block; }
  .row-what { display: block; margin-top: 5px; }
  .row-side { flex: 0 0 auto; margin-left: auto; }
  .row-tags { display: none; }
  .row-desc { margin-top: 10px; font-size: 14px; }
  .row:hover { padding-left: 8px; }
  .sec-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .sec-count { margin-left: 0; }
  .foot-meta { text-align: left; }
  .toc { gap: 10px; }
  .toc a { padding: 10px 16px; }
}

/* ============ 交互增强：指针光斑 + 点击涟漪 ============
   玻璃表面的液态高光跟随指针（liquid-glass 质感），按下处扩散墨色涟漪。
   全部尊重 prefers-reduced-motion：JS 不绑定监听、CSS 过渡已全局降级。 */
/* overflow:hidden 仅给需要裁切涟漪的元素；灯泡开关的火花、品牌圆点的光晕不能被裁掉 */
.card, .toc a, .foot-meta a, .btn {
  position: relative; overflow: hidden;
}
/* 卡片：指针光斑（投在封面与正文之间） */
.card::before {
  content: ''; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  border-radius: inherit; opacity: 0;
  background: radial-gradient(240px 240px at var(--mx, 50%) var(--my, 50%),
    var(--spot-c, rgba(255, 255, 255, 0.10)), transparent 62%);
  transition: opacity .45s var(--ease);
}
.card:hover::before, .card:focus-visible::before { opacity: 1; }
.card:hover, .card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--glass), 0 10px 30px -14px var(--spot-c, rgba(255, 255, 255, 0.25));
  border-color: var(--line-2);
}
.card:active { transform: translateY(-1px) scale(.985); }
/* 目录按钮：指针光斑 + 悬浮提亮 + 编号强调 */
.toc a::before {
  content: ''; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  border-radius: inherit; opacity: 0;
  background: radial-gradient(170px 170px at var(--mx, 50%) var(--my, 50%),
    var(--spot-c, rgba(255, 255, 255, 0.12)), transparent 62%);
  transition: opacity .45s var(--ease);
}
.toc a > * { position: relative; z-index: 1; }
.toc a:hover::before, .toc a:focus-visible::before { opacity: 1; }
.toc a:hover, .toc a:focus-visible {
  transform: translateY(-2px); color: var(--ink);
  box-shadow: var(--glass), 0 8px 22px -10px var(--spot-c, rgba(255, 255, 255, 0.30));
  border-color: var(--line-2);
}
.toc a em { transition: color .4s var(--ease); }
.toc a:hover em, .toc a:focus-visible em { color: var(--ink-2); }
/* 品牌圆点：悬浮轻微放大 + 光晕 */
.brand-dot { transition: transform .45s var(--ease), box-shadow .45s var(--ease); }
.brand:hover .brand-dot, .brand:focus-visible .brand-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(140, 140, 150, 0.22), 0 0 14px 2px var(--accent);
}
/* 点击涟漪：在按下处扩散的墨色圆点 */
.ripple-dot {
  position: absolute; z-index: 1; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, var(--ripple-c, rgba(255, 255, 255, 0.45)) 0%, transparent 62%);
  transform: scale(0); opacity: .7;
  animation: rippleGo .6s var(--ease) forwards;
}
@keyframes rippleGo { to { transform: scale(1); opacity: 0; } }