/* ==========================================================================
   CurrentGames 设计系统
   方向：深邃宇宙 + 生态极光（详见 DESIGN.md）
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 背景层 */
  --bg: #05070e;
  --bg-soft: #0b1020;
  --bg-elev: #121a2e;
  --bg-card: rgba(255, 255, 255, 0.035);

  /* 文本层 */
  --fg: #eef2fa;
  --fg-mute: #9aa8c4;
  --fg-dim: #64718c;

  /* 品牌色 */
  --jade: #35e0b0;
  --violet: #7b5cff;
  --cyan: #38bdf8;
  --gold: #e8b44a;

  /* 描边与阴影 */
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 28px 70px rgba(0, 0, 0, 0.6);
  --glow-jade: 0 0 40px rgba(53, 224, 176, 0.25);
  --glow-violet: 0 0 40px rgba(123, 92, 255, 0.28);

  /* 渐变 */
  --aurora: linear-gradient(100deg, #35e0b0 0%, #38bdf8 38%, #7b5cff 78%);
  --aurora-soft: linear-gradient(100deg, rgba(53, 224, 176, 0.16), rgba(56, 189, 248, 0.14) 38%, rgba(123, 92, 255, 0.18) 78%);

  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;

  /* 尺寸节奏 */
  --maxw: 1240px;
  --maxw-wide: 1440px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-y: clamp(5rem, 12vw, 9.5rem);

  /* 圆角 */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 30px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.55s;
}

/* hidden 属性必须始终生效：否则被 display:grid/flex 的规则覆盖，元素会一直显示 */
[hidden] { display: none !important; }

/* 语言块：默认隐藏英文（避免 JS 未执行时中英同时显示）。
   注意：必须用 data-lang-active 判断，不能只靠 [hidden]——
   因为下面这条 [data-lang-block="en"] 规则会一直把它藏住，JS 改 hidden 属性也没用。 */
[data-lang-block="en"]:not([data-lang-active="en"]) { display: none; }
[data-lang-block="zh"]:not([data-lang-active="zh"]) { display: none; }

/* ---------- 2. 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: clamp(0.95rem, 0.9rem + 0.2vw, 1.05rem);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, picture, svg, video { display: block; max-width: 100%; }
img { height: auto; }

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  text-wrap: balance;
}
p { margin: 0; text-wrap: pretty; }

:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection { background: rgba(123, 92, 255, 0.4); color: #fff; }

/* ---------- 3. 背景氛围层 ---------- */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(1200px 700px at 15% -5%, rgba(53, 224, 176, 0.09), transparent 60%),
    radial-gradient(1000px 600px at 88% 8%, rgba(123, 92, 255, 0.11), transparent 62%),
    var(--bg);
}

/* 极光：缓慢漂移的模糊光斑 */
.bg-aurora {
  position: absolute;
  width: 60vw;
  height: 60vw;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  will-change: transform;
}
.bg-aurora--a {
  top: -22vw; left: -12vw;
  background: radial-gradient(circle, rgba(53, 224, 176, 0.5), transparent 68%);
  animation: drift-a 26s var(--ease) infinite alternate;
}
.bg-aurora--b {
  top: 8vw; right: -18vw;
  background: radial-gradient(circle, rgba(123, 92, 255, 0.5), transparent 68%);
  animation: drift-b 32s var(--ease) infinite alternate;
}
.bg-aurora--c {
  bottom: -26vw; left: 28vw;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.34), transparent 68%);
  animation: drift-c 38s var(--ease) infinite alternate;
}
@keyframes drift-a { to { transform: translate3d(8vw, 6vw, 0) scale(1.15); } }
@keyframes drift-b { to { transform: translate3d(-10vw, 8vw, 0) scale(1.1); } }
@keyframes drift-c { to { transform: translate3d(6vw, -8vw, 0) scale(1.18); } }

/* 星野：用 radial-gradient 铺点，无需图片 */
.bg-stars {
  position: absolute;
  inset: -50%;
  background-image:
    radial-gradient(1.4px 1.4px at 20% 30%, rgba(255, 255, 255, 0.7), transparent),
    radial-gradient(1.2px 1.2px at 70% 12%, rgba(255, 255, 255, 0.55), transparent),
    radial-gradient(1.6px 1.6px at 42% 68%, rgba(255, 255, 255, 0.6), transparent),
    radial-gradient(1px 1px at 88% 54%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1.3px 1.3px at 12% 82%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 58% 88%, rgba(255, 255, 255, 0.4), transparent);
  background-size: 520px 520px, 420px 420px, 640px 640px, 380px 380px, 700px 700px, 480px 480px;
  animation: twinkle 7s ease-in-out infinite alternate;
}
@keyframes twinkle { from { opacity: 0.5; } to { opacity: 0.95; } }

/* 细网格：科技感的秩序底纹 */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
}

/* ---------- 4. 布局 ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--wide { max-width: var(--maxw-wide); }

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3rem, 7vw, 5rem); }

/* 区块标题组合 */
.sec-head { max-width: 62ch; margin-bottom: clamp(2.25rem, 5vw, 3.5rem); }
.sec-head__eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--jade); margin-bottom: 1rem;
}
.sec-head__eyebrow::before {
  content: ""; width: 1.75rem; height: 1px; background: var(--aurora);
}
.sec-head__title { font-size: clamp(1.75rem, 1.2rem + 2.4vw, 3rem); }
.sec-head__desc { margin-top: 1rem; color: var(--fg-mute); max-width: 56ch; }

/* 极光分隔线 */
.rule-aurora {
  height: 1px; border: 0; margin: 0;
  background: linear-gradient(90deg, transparent, rgba(53, 224, 176, 0.5) 20%, rgba(123, 92, 255, 0.5) 80%, transparent);
}

/* 渐变文字 */
.grad-text {
  background: var(--aurora);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- 5. 导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), backdrop-filter var(--dur);
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(5, 7, 14, 0.78);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--line);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; height: 4.5rem;
}

/* 品牌标识 */
.brand { display: inline-flex; align-items: center; gap: 0.7rem; font-weight: 700; letter-spacing: 0.01em; }
.brand__mark {
  width: 2rem; height: 2rem; border-radius: 9px; flex: none;
  background: var(--aurora);
  display: grid; place-items: center;
  font-family: var(--font-serif); font-size: 0.95rem; color: #05070e;
  box-shadow: var(--glow-jade);
  position: relative;
}
.brand__mark::after {
  content: ""; position: absolute; inset: 2px; border-radius: 7px;
  background: linear-gradient(180deg, rgba(255,255,255,.35), transparent 55%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__en { font-size: 0.98rem; }
.brand__cn { font-size: 0.66rem; letter-spacing: 0.28em; color: var(--fg-dim); font-weight: 500; }

.nav__links { display: flex; align-items: center; gap: 0.35rem; }
.nav__right { display: flex; align-items: center; gap: 0.6rem; }

/* 语言切换按钮 */
.lang-toggle {
  padding: 0.42rem 0.9rem; border-radius: 999px;
  font-size: 0.84rem; font-weight: 600; letter-spacing: 0.04em;
  color: var(--fg-mute);
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.04);
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.lang-toggle:hover { color: var(--fg); border-color: var(--jade); background: rgba(53, 224, 176, 0.1); }
.nav__link {
  padding: 0.5rem 0.95rem; border-radius: 999px;
  font-size: 0.9rem; color: var(--fg-mute);
  transition: color 0.25s, background 0.25s;
}
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--fg); background: rgba(255, 255, 255, 0.06); }

.nav__toggle { display: none; width: 2.5rem; height: 2.5rem; border-radius: 10px; border: 1px solid var(--line); }
.nav__toggle span { display: block; width: 1.1rem; height: 1.5px; background: var(--fg); margin: 3px auto; transition: 0.3s var(--ease); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55rem;
  padding: 0.8rem 1.5rem; border-radius: 999px;
  font-size: 0.92rem; font-weight: 600; white-space: nowrap;
  border: 1px solid var(--line-strong);
  transition: transform 0.3s var(--ease), background 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: var(--aurora); color: #05070e; border-color: transparent;
  box-shadow: 0 8px 26px rgba(53, 224, 176, 0.22);
}
.btn--primary:hover { box-shadow: 0 14px 38px rgba(123, 92, 255, 0.34); }
.btn--ghost { background: rgba(255, 255, 255, 0.04); color: var(--fg); }
.btn--ghost:hover { background: rgba(255, 255, 255, 0.09); border-color: var(--line-strong); }
.btn--sm { padding: 0.55rem 1.05rem; font-size: 0.84rem; }

/* ---------- 7. 卡片 ---------- */
.card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: transform 0.5s var(--ease), border-color 0.4s, box-shadow 0.5s;
}
.card:hover { transform: translateY(-6px); border-color: var(--line-strong); box-shadow: var(--shadow-lg); }
/* 悬停时顶部浮现极光 */
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--aurora); opacity: 0; transition: opacity 0.4s;
}
.card:hover::before { opacity: 1; }

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.28rem 0.7rem; border-radius: 999px;
  font-size: 0.74rem; letter-spacing: 0.04em;
  color: var(--fg-mute);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}
.tag--jade { color: var(--jade); border-color: rgba(53, 224, 176, 0.3); background: rgba(53, 224, 176, 0.08); }
.tag--gold { color: var(--gold); border-color: rgba(232, 180, 74, 0.3); background: rgba(232, 180, 74, 0.08); }
.tag--violet { color: #b9a6ff; border-color: rgba(123, 92, 255, 0.34); background: rgba(123, 92, 255, 0.1); }

/* ---------- 9. 滚动渐显 ---------- */
/* 默认可见（无 JS 时也能看到全部内容）。
   只有确认 JS 已运行时（html.js）才启用渐显动效。 */
.reveal { opacity: 1; transform: none; }
.js .reveal {
  opacity: 0; transform: translateY(26px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.js .reveal.is-in { opacity: 1; transform: none; }
.js .reveal[data-delay="1"] { transition-delay: 0.08s; }
.js .reveal[data-delay="2"] { transition-delay: 0.16s; }
.js .reveal[data-delay="3"] { transition-delay: 0.24s; }
.js .reveal[data-delay="4"] { transition-delay: 0.32s; }
.js .reveal[data-delay="5"] { transition-delay: 0.4s; }

/* ---------- 10. 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: rgba(5, 7, 14, 0.6); padding-block: 3.5rem 2.5rem; }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 2.5rem; }
.footer__tagline { margin-top: 1.1rem; color: var(--fg-mute); font-size: 0.9rem; max-width: 34ch; }
.footer__title { font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--fg-dim); margin-bottom: 1rem; font-family: var(--font-mono); }
.footer__list li + li { margin-top: 0.55rem; }
.footer__list a { color: var(--fg-mute); font-size: 0.9rem; transition: color 0.25s; }
.footer__list a:hover { color: var(--jade); }
.footer__bottom {
  margin-top: 3rem; padding-top: 1.75rem; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  font-size: 0.82rem; color: var(--fg-dim);
}
.footer__signals { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer__signals a { color: var(--fg-dim); transition: color 0.25s; }
.footer__signals a:hover { color: var(--jade); }

/* ---------- 11. 无障碍 ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; top: -100px; left: 1rem; z-index: 200;
  padding: 0.6rem 1rem; background: var(--jade); color: #05070e; border-radius: 8px; font-weight: 600;
}
.skip-link:focus { top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 900px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 768px) {
  .nav__links {
    position: fixed; inset: 4.5rem 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0.25rem;
    padding: 1rem var(--gutter) 1.5rem;
    background: rgba(5, 7, 14, 0.97);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    transition: transform 0.45s var(--ease);
  }
  .nav__links.is-open { transform: none; }
  .nav__link { padding: 0.85rem 0.5rem; font-size: 1rem; }
  .nav__toggle { display: block; }
}
@media (max-width: 560px) {
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; }
}