/* ============================================================
   Yunumi · 共享设计系统
   - 基础令牌 / 圆角 / 间距 / 字体（全局一致）
   - [data-theme="dark"|"light"]  亮暗模式
   - [data-scheme="aurora"|"frost"|"ember"]  三套配色
   ============================================================ */
:root{
  --radius: 18px;
  --radius-sm: 12px;
  --radius-pill: 999px;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 1160px;
  --maxw-doc: 1180px;
  --ease: cubic-bezier(.22,.61,.36,1);

  /* 默认配色（Aurora 紫粉） */
  --grad-1: #7C3AED;
  --grad-2: #EC4899;
  --accent: #7C3AED;
  --accent-2: #EC4899;
  --cyan: #06B6D4;
  --grad: linear-gradient(135deg, var(--grad-1) 0%, var(--grad-2) 100%);
  --c1: #7C3AED;
  --c2: #EC4899;
  --c3: #06B6D4;
}

/* ---- 配色方案：Frost 冰蓝 ---- */
[data-scheme="frost"]{
  --grad-1: #0EA5E9;
  --grad-2: #6366F1;
  --accent: #0EA5E9;
  --accent-2: #6366F1;
  --cyan: #22D3EE;
  --c1: #0EA5E9;
  --c2: #6366F1;
  --c3: #22D3EE;
}
/* ---- 配色方案：Ember 暖橙 ---- */
[data-scheme="ember"]{
  --grad-1: #F97316;
  --grad-2: #DB2777;
  --accent: #F97316;
  --accent-2: #DB2777;
  --cyan: #F59E0B;
  --c1: #F97316;
  --c2: #DB2777;
  --c3: #F59E0B;
}

/* 暗色（默认） */
[data-theme="dark"]{
  --bg: #0A0B1A;
  --bg-elev: #0E1024;
  --text: #F8FAFC;
  --text-muted: rgba(248,250,252,.62);
  --text-faint: rgba(248,250,252,.42);
  --glass-bg: rgba(255,255,255,.05);
  --glass-bg-strong: rgba(255,255,255,.08);
  --glass-border: rgba(255,255,255,.10);
  --glass-border-strong: rgba(255,255,255,.18);
  --hairline: rgba(255,255,255,.10);
  --nav-bg: rgba(10,11,26,.55);
  --orb-1: rgba(124,58,237,.45);
  --orb-2: rgba(6,182,212,.32);
  --orb-3: rgba(236,72,153,.28);
  --shadow: 0 24px 60px -20px rgba(0,0,0,.7);
  --code-bg: rgba(255,255,255,.04);
  --code-text: rgba(248,250,252,.86);
}
/* 亮色（可切换） */
[data-theme="light"]{
  --bg: #EEF1FB;
  --bg-elev: #FFFFFF;
  --text: #0A0B1A;
  --text-muted: rgba(10,11,26,.62);
  --text-faint: rgba(10,11,26,.42);
  --glass-bg: rgba(255,255,255,.55);
  --glass-bg-strong: rgba(255,255,255,.72);
  --glass-border: rgba(10,11,26,.10);
  --glass-border-strong: rgba(10,11,26,.16);
  --hairline: rgba(10,11,26,.10);
  --nav-bg: rgba(238,241,251,.62);
  --orb-1: rgba(124,58,237,.22);
  --orb-2: rgba(6,182,212,.18);
  --orb-3: rgba(236,72,153,.16);
  --shadow: 0 24px 60px -24px rgba(40,30,90,.35);
  --code-bg: rgba(10,11,26,.04);
  --code-text: rgba(10,11,26,.82);
}

/* ============================================================
   基础
   ============================================================ */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .4s var(--ease), color .4s var(--ease);
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img{display:block;max-width:100%}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.mono{font-family:var(--font-mono)}

/* 宇宙背景：径向渐变层 + 发光球（仅 transform/opacity 动画） */
.cosmos{
  position:fixed;inset:0;z-index:-2;overflow:hidden;
  background:
    radial-gradient(1200px 800px at 78% -8%, var(--orb-1), transparent 60%),
    radial-gradient(900px 700px at 12% 18%, var(--orb-2), transparent 55%),
    radial-gradient(1000px 900px at 50% 120%, var(--orb-3), transparent 60%),
    var(--bg);
  transition:background .4s var(--ease);
}
.cosmos::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.5) .5px, transparent .6px);
  background-size:42px 42px;
  -webkit-mask-image:radial-gradient(circle at 50% 30%, #000, transparent 75%);
  mask-image:radial-gradient(circle at 50% 30%, #000, transparent 75%);
  opacity:.35;
}

/* ============================================================
   玻璃卡片
   ============================================================ */
.glass{
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-radius:var(--radius);
}

/* ============================================================
   导航栏（固定毛玻璃）
   ============================================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:var(--nav-bg);
  backdrop-filter:blur(16px) saturate(160%);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--hairline);
  transition:background .4s var(--ease), border-color .4s var(--ease), transform .35s var(--ease);
}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:-.01em}
.brand__mark{
  width:32px;height:32px;border-radius:10px;display:grid;place-items:center;
  background:var(--grad);color:#fff;box-shadow:0 6px 18px -6px var(--accent);
}
.brand__mark svg{width:18px;height:18px}
.nav__links{display:flex;gap:30px}
.nav__links a{color:var(--text-muted);font-size:14.5px;font-weight:500;transition:color .25s var(--ease)}
.nav__links a:hover,.nav__links a.is-active{color:var(--text)}
.nav__right{display:flex;align-items:center;gap:14px}

/* 配色切换器（3 色板） */
.scheme-switch{display:flex;align-items:center;gap:7px}
.scheme-switch button{
  width:20px;height:20px;border-radius:50%;border:2px solid var(--glass-border);
  padding:0;transition:transform .25s var(--ease), border-color .25s var(--ease);
}
.scheme-switch button:hover{transform:scale(1.12)}
.scheme-switch button.is-active{border-color:var(--text);transform:scale(1.18)}
.scheme-switch .sw{display:block;width:100%;height:100%;border-radius:50%}
.sw--aurora{background:linear-gradient(135deg,#7C3AED,#EC4899)}
.sw--frost{background:linear-gradient(135deg,#0EA5E9,#6366F1)}
.sw--ember{background:linear-gradient(135deg,#F97316,#DB2777)}

.theme-toggle{
  width:40px;height:40px;border-radius:var(--radius-pill);
  display:grid;place-items:center;border:1px solid var(--glass-border);
  background:var(--glass-bg);color:var(--text);transition:transform .3s var(--ease), border-color .3s var(--ease);
}
.theme-toggle:hover{transform:rotate(18deg);border-color:var(--glass-border-strong)}
.theme-toggle svg{width:19px;height:19px}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="light"] .icon-moon{display:none}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:600;font-size:15px;border-radius:var(--radius-pill);
  padding:11px 22px;transition:transform .3s var(--ease), box-shadow .3s var(--ease), opacity .3s var(--ease);
}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 12px 30px -10px var(--accent-2)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px -12px var(--accent-2)}
.btn--ghost{background:var(--glass-bg);border:1px solid var(--glass-border);color:var(--text)}
.btn--ghost:hover{transform:translateY(-2px);border-color:var(--glass-border-strong)}
.nav__cta{padding:9px 18px;font-size:14px}
.nav__burger{display:none}

/* 移动端抽屉 */
.drawer-backdrop{position:fixed;inset:0;z-index:60;background:rgba(0,0,0,.5);opacity:0;visibility:hidden;transition:opacity .3s var(--ease),visibility .3s var(--ease)}
.drawer-backdrop.is-open{opacity:1;visibility:visible}
.drawer{
  position:fixed;top:0;right:0;bottom:0;z-index:61;width:78%;max-width:320px;
  background:var(--bg-elev);border-left:1px solid var(--glass-border);
  transform:translateX(100%);transition:transform .35s var(--ease);
  padding:80px 26px 26px;display:flex;flex-direction:column;gap:6px;
}
.drawer.is-open{transform:translateX(0)}
.drawer a{padding:14px 16px;border-radius:var(--radius-sm);font-weight:500;color:var(--text-muted)}
.drawer a:hover{background:var(--glass-bg);color:var(--text)}
.drawer .btn{margin-top:14px}

/* ============================================================
   通用区块
   ============================================================ */
.section{padding:120px 0;position:relative}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;letter-spacing:.02em;
  color:var(--text-muted);padding:7px 14px;border-radius:var(--radius-pill);
  background:var(--glass-bg);border:1px solid var(--glass-border);
}
.eyebrow svg{width:15px;height:15px;color:var(--cyan)}
.section__head{text-align:center;max-width:680px;margin:0 auto 60px}
.section__title{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-.02em;line-height:1.15;margin:18px 0 14px}
.section__sub{color:var(--text-muted);font-size:17px}

/* ============================================================
   Hero
   ============================================================ */
.hero{padding:170px 0 90px;position:relative}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero__tag{margin-bottom:22px}
.hero__title{font-size:clamp(38px,5.4vw,62px);font-weight:800;line-height:1.08;letter-spacing:-.03em}
.hero__title .grad-text{display:inline}
.hero__desc{margin:24px 0 32px;font-size:18px;color:var(--text-muted);max-width:520px}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap}
.hero__meta{margin-top:26px;display:flex;gap:26px;flex-wrap:wrap;color:var(--text-faint);font-size:13.5px}
.hero__meta b{color:var(--text);font-weight:700}
.hero__visual{position:relative}
.hero__visual .badge-float{
  position:absolute;z-index:2;padding:10px 14px;border-radius:var(--radius-sm);
  background:var(--glass-bg-strong);border:1px solid var(--glass-border-strong);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  display:flex;align-items:center;gap:9px;font-size:13px;font-weight:600;
  box-shadow:var(--shadow);
}
.hero__visual .badge-float svg{width:18px;height:18px;color:var(--accent)}
.hero__visual .badge-float.b1{top:8%;left:-6%;animation:floaty 6s var(--ease) infinite}
.hero__visual .badge-float.b2{bottom:10%;right:-4%;animation:floaty 7s var(--ease) infinite reverse}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* CSS 3D 透视 mockup */
.mockup-stage{perspective:1400px}
.mockup{
  position:relative;border-radius:var(--radius);
  background:var(--glass-bg-strong);border:1px solid var(--glass-border-strong);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  padding:22px;box-shadow:var(--shadow);
  transform:rotateY(-15deg) rotateX(7deg);transform-style:preserve-3d;
  animation:float 7s var(--ease) infinite;
}
@keyframes float{
  0%,100%{transform:rotateY(-15deg) rotateX(7deg) translateY(0)}
  50%{transform:rotateY(-12deg) rotateX(5deg) translateY(-14px)}
}
.mockup__bar{display:flex;align-items:center;gap:8px;margin-bottom:18px}
.mockup__dot{width:11px;height:11px;border-radius:50%;background:var(--glass-border-strong)}
.mockup__dot:nth-child(1){background:var(--accent-2)}
.mockup__dot:nth-child(2){background:var(--cyan)}
.mockup__dot:nth-child(3){background:var(--accent)}
.mockup__chap{font-size:12px;color:var(--text-faint);font-family:var(--font-mono);margin-left:auto}
.mockup__title{font-size:18px;font-weight:700;margin-bottom:6px}
.mockup__sub{font-size:13px;color:var(--text-muted);margin-bottom:16px}
.mockup__progress{height:8px;border-radius:var(--radius-pill);background:var(--code-bg);overflow:hidden;margin-bottom:18px}
.mockup__progress i{display:block;height:100%;width:64%;background:var(--grad);border-radius:var(--radius-pill)}
.mockup__row{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:var(--radius-sm);background:var(--code-bg);margin-bottom:9px;font-size:13.5px}
.mockup__row.is-done{opacity:.55}
.mockup__check{width:20px;height:20px;border-radius:50%;display:grid;place-items:center;background:var(--grad);color:#fff;flex:none}
.mockup__check svg{width:12px;height:12px}
.mockup__row span{flex:1}
.mockup__code{margin-top:14px;background:var(--code-bg);border:1px solid var(--hairline);border-radius:var(--radius-sm);padding:13px 14px;font-family:var(--font-mono);font-size:12px;line-height:1.7;color:var(--text-muted);overflow:hidden}
.mockup__code .k{color:var(--cyan)}
.mockup__code .s{color:var(--accent-2)}

/* 信任条 */
.trustbar{display:flex;flex-wrap:wrap;gap:14px 28px;align-items:center;justify-content:center;margin-top:46px;color:var(--text-faint);font-size:13.5px}
.trustbar span{display:inline-flex;align-items:center;gap:8px}
.trustbar svg{width:16px;height:16px;color:var(--cyan)}

/* ============================================================
   特性网格 3x3
   ============================================================ */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{
  position:relative;padding:26px;border-radius:var(--radius);
  background:var(--glass-bg);border:1px solid var(--glass-border);
  transition:transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
  overflow:hidden;display:block;
}
.feat::before{
  content:"";position:absolute;inset:0;border-radius:var(--radius);opacity:0;
  background:radial-gradient(420px 200px at 50% -20%, color-mix(in srgb, var(--c) 28%, transparent), transparent 70%);
  transition:opacity .4s var(--ease);pointer-events:none;
}
.feat:hover{transform:translateY(-8px);border-color:var(--glass-border-strong);box-shadow:0 22px 46px -22px rgba(0,0,0,.6)}
.feat:hover::before{opacity:1}
.feat__icon{
  width:48px;height:48px;border-radius:14px;display:grid;place-items:center;margin-bottom:16px;
  background:color-mix(in srgb, var(--c) 16%, transparent);color:var(--c);
}
.feat__icon svg{width:24px;height:24px}
.feat__title{font-size:17px;font-weight:700;margin-bottom:8px;letter-spacing:-.01em}
.feat__desc{font-size:14.5px;color:var(--text-muted)}
.feat__tag{position:absolute;top:22px;right:22px;font-family:var(--font-mono);font-size:11px;color:var(--text-faint)}
.feat__arrow{position:absolute;bottom:22px;right:22px;width:22px;height:22px;color:var(--text-faint);transition:transform .3s var(--ease),color .3s var(--ease)}
.feat:hover .feat__arrow{transform:translate(3px,-3px);color:var(--c)}

/* ============================================================
   评价轮播
   ============================================================ */
.carousel{position:relative;max-width:760px;margin:0 auto;overflow:hidden}
.carousel__track{display:flex;will-change:transform;transition:transform .55s var(--ease);cursor:grab}
.carousel__track.is-drag{cursor:grabbing;transition:none}
.slide{flex:0 0 100%;padding:0 6px}
.quote-card{
  padding:38px 40px;border-radius:var(--radius);text-align:center;
  background:var(--glass-bg);border:1px solid var(--glass-border);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
}
.quote-card__avatar{width:72px;height:72px;border-radius:50%;margin:0 auto 18px;object-fit:cover;border:2px solid var(--glass-border-strong);box-shadow:0 10px 26px -10px rgba(0,0,0,.5)}
.stars{display:flex;gap:4px;justify-content:center;margin-bottom:16px;color:var(--accent-2)}
.stars svg{width:18px;height:18px}
.quote-card__text{font-size:18px;line-height:1.65;color:var(--text);margin-bottom:20px}
.quote-card__name{font-weight:700;font-size:15.5px}
.quote-card__role{font-size:13.5px;color:var(--text-faint);font-family:var(--font-mono)}
.carousel__dots{display:flex;gap:9px;justify-content:center;margin-top:26px}
.carousel__dots button{width:9px;height:9px;border-radius:50%;background:var(--glass-border-strong);transition:transform .3s var(--ease), background .3s var(--ease)}
.carousel__dots button.is-active{background:var(--grad);transform:scale(1.35)}
.carousel__btn{
  position:absolute;top:42%;transform:translateY(-50%);z-index:3;
  width:44px;height:44px;border-radius:50%;display:grid;place-items:center;
  background:var(--glass-bg-strong);border:1px solid var(--glass-border);color:var(--text);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:transform .3s var(--ease), border-color .3s var(--ease);
}
.carousel__btn:hover{border-color:var(--glass-border-strong);transform:translateY(-50%) scale(1.08)}
.carousel__btn svg{width:20px;height:20px}
.carousel__btn--prev{left:-8px}
.carousel__btn--next{right:-8px}

/* ============================================================
   FAQ 手风琴
   ============================================================ */
.faq{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq__item{border-radius:var(--radius);background:var(--glass-bg);border:1px solid var(--glass-border);overflow:hidden;transition:border-color .3s var(--ease)}
.faq__item.is-open{border-color:var(--glass-border-strong)}
.faq__q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 24px;text-align:left;font-size:16.5px;font-weight:600;
}
.faq__chev{flex:none;width:22px;height:22px;color:var(--text-muted);transition:transform .35s var(--ease)}
.faq__item.is-open .faq__chev{transform:rotate(180deg)}
.faq__a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .4s var(--ease)}
.faq__item.is-open .faq__a{grid-template-rows:1fr}
.faq__a-inner{overflow:hidden}
.faq__a p{padding:0 24px 22px;color:var(--text-muted);font-size:15px}

/* ============================================================
   CTA / 订阅
   ============================================================ */
.subscribe{padding:100px 0 130px}
.subscribe__card{
  max-width:760px;margin:0 auto;text-align:center;padding:54px 40px;border-radius:var(--radius);
  background:var(--glass-bg);border:1px solid var(--glass-border);position:relative;overflow:hidden;
}
.subscribe__card::before{content:"";position:absolute;top:-40%;left:50%;transform:translateX(-50%);width:520px;height:320px;background:radial-gradient(circle,var(--orb-1),transparent 70%);opacity:.5;pointer-events:none}
.subscribe__title{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:-.02em;margin-bottom:12px;position:relative}
.subscribe__sub{color:var(--text-muted);margin-bottom:28px;position:relative}
.form{display:flex;gap:12px;max-width:480px;margin:0 auto;position:relative}
.form__input{
  flex:1;padding:14px 18px;border-radius:var(--radius-pill);font-size:15px;color:var(--text);
  background:var(--code-bg);border:1px solid var(--glass-border);outline:none;transition:border-color .3s var(--ease);
}
.form__input::placeholder{color:var(--text-faint)}
.form__input:focus{border-color:var(--accent)}
.form__btn{position:relative;min-width:128px}
.form__btn.is-loading{pointer-events:none;opacity:.85}
.spinner{width:17px;height:17px;border-radius:50%;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;animation:spin .7s linear infinite;display:none}
.form__btn.is-loading .spinner{display:inline-block}
.form__btn.is-loading .btn-label{display:none}
@keyframes spin{to{transform:rotate(360deg)}}
.form__hint{margin-top:16px;font-size:13px;color:var(--text-faint);position:relative}

/* CTA 大块 */
.cta-band{padding:30px 0 110px}
.cta-band__card{
  max-width:var(--maxw);margin:0 auto;text-align:center;padding:56px 40px;border-radius:var(--radius);
  background:var(--glass-bg);border:1px solid var(--glass-border);position:relative;overflow:hidden;
}
.cta-band__card::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 50% 0%, var(--orb-1), transparent 70%);opacity:.45;pointer-events:none}
.cta-band__title{font-size:clamp(26px,3.6vw,38px);font-weight:800;letter-spacing:-.02em;margin-bottom:14px;position:relative}
.cta-band__sub{color:var(--text-muted);margin-bottom:28px;position:relative}
.cta-band__cta{position:relative;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* Toast */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,140%);
  z-index:80;display:flex;align-items:center;gap:12px;
  padding:14px 20px;border-radius:var(--radius-pill);
  background:var(--glass-bg-strong);border:1px solid var(--glass-border-strong);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:var(--shadow);opacity:0;transition:transform .45s var(--ease), opacity .45s var(--ease);
  font-size:14.5px;font-weight:500;max-width:90vw;
}
.toast.is-show{transform:translate(-50%,0);opacity:1}
.toast__icon{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:var(--grad);color:#fff;flex:none}
.toast__icon svg{width:15px;height:15px}

/* Footer */
.footer{border-top:1px solid var(--hairline);padding:46px 0;color:var(--text-faint);font-size:13.5px}
.footer__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer a{color:var(--text-muted)}
.footer a:hover{color:var(--text)}
.footer__cols{display:flex;gap:40px;flex-wrap:wrap}
.footer__col h4{font-size:13px;color:var(--text);margin-bottom:10px;letter-spacing:.02em}
.footer__col a{display:block;margin-bottom:7px;font-size:13.5px}

/* ============================================================
   教程分类页 (tutorials.html)
   ============================================================ */
.cat-hero{padding:150px 0 50px;text-align:center}
.cat-hero__title{font-size:clamp(34px,5vw,54px);font-weight:800;letter-spacing:-.03em;margin:18px 0 16px}
.cat-hero__sub{color:var(--text-muted);font-size:18px;max-width:620px;margin:0 auto}
.cat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding-bottom:40px}
.cat-card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:26px;border-radius:var(--radius);background:var(--glass-bg);
  border:1px solid var(--glass-border);overflow:hidden;
  transition:transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.cat-card::before{
  content:"";position:absolute;inset:0;opacity:0;border-radius:var(--radius);
  background:radial-gradient(420px 220px at 50% -20%, color-mix(in srgb, var(--c) 26%, transparent), transparent 70%);
  transition:opacity .4s var(--ease);pointer-events:none;
}
.cat-card:hover{transform:translateY(-8px);border-color:var(--glass-border-strong);box-shadow:0 22px 46px -22px rgba(0,0,0,.6)}
.cat-card:hover::before{opacity:1}
.cat-card__icon{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;background:color-mix(in srgb, var(--c) 16%, transparent);color:var(--c)}
.cat-card__icon svg{width:25px;height:25px}
.cat-card__tag{font-family:var(--font-mono);font-size:11px;color:var(--text-faint)}
.cat-card__title{font-size:18px;font-weight:700;letter-spacing:-.01em}
.cat-card__desc{font-size:14px;color:var(--text-muted);flex:1}
.cat-card__meta{display:flex;align-items:center;gap:14px;font-size:12.5px;color:var(--text-faint);font-family:var(--font-mono)}
.cat-card__go{margin-top:6px;display:inline-flex;align-items:center;gap:7px;font-weight:600;font-size:14px;color:var(--c)}
.cat-card__go svg{width:16px;height:16px;transition:transform .3s var(--ease)}
.cat-card:hover .cat-card__go svg{transform:translateX(4px)}

/* ============================================================
   教程详情页 (tutorials/<slug>.html)
   ============================================================ */
.doc{padding:140px 0 80px}
.doc__layout{display:grid;grid-template-columns:220px 1fr;gap:48px;max-width:var(--maxw-doc);margin:0 auto;align-items:start}
.doc__breadcrumb{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--text-faint);margin-bottom:26px;flex-wrap:wrap}
.doc__breadcrumb a{color:var(--text-muted)}
.doc__breadcrumb a:hover{color:var(--text)}
.doc__breadcrumb svg{width:14px;height:14px}
.doc__head{max-width:760px;margin:0 0 40px}
.doc__tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--text-muted);padding:7px 14px;border-radius:var(--radius-pill);background:var(--glass-bg);border:1px solid var(--glass-border);margin-bottom:18px}
.doc__tag svg{width:15px;height:15px;color:var(--cyan)}
.doc__title{font-size:clamp(30px,4.4vw,46px);font-weight:800;letter-spacing:-.03em;line-height:1.12;margin-bottom:16px}
.doc__intro{font-size:18px;color:var(--text-muted);line-height:1.7}
.doc__meta{display:flex;gap:20px;flex-wrap:wrap;margin-top:22px;font-size:13px;color:var(--text-faint);font-family:var(--font-mono)}
.doc__meta span{display:inline-flex;align-items:center;gap:7px}
.doc__meta svg{width:15px;height:15px;color:var(--cyan)}

.doc__toc{position:sticky;top:96px;align-self:start}
.doc__toc h4{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);margin-bottom:14px}
.doc__toc a{display:block;padding:7px 12px;border-left:2px solid var(--glass-border);color:var(--text-muted);font-size:14px;transition:color .25s var(--ease),border-color .25s var(--ease)}
.doc__toc a:hover{color:var(--text)}
.doc__toc a.is-active{color:var(--text);border-left-color:var(--accent);font-weight:600}

.doc__content{max-width:760px}
.doc__content h2{font-size:26px;font-weight:800;letter-spacing:-.02em;margin:48px 0 16px;scroll-margin-top:96px}
.doc__content h3{font-size:19px;font-weight:700;margin:30px 0 12px;scroll-margin-top:96px}
.doc__content p{color:var(--text-muted);margin-bottom:16px;font-size:16px;line-height:1.75}
.doc__content ul,.doc__content ol{color:var(--text-muted);margin:0 0 18px 22px;font-size:16px;line-height:1.75}
.doc__content li{margin-bottom:8px}
.doc__content strong{color:var(--text);font-weight:700}
.doc__content a.link{color:var(--accent);border-bottom:1px solid color-mix(in srgb,var(--accent) 40%,transparent);transition:border-color .25s}
.doc__content a.link:hover{border-color:var(--accent)}
.doc__content code{font-family:var(--font-mono);font-size:14px;background:var(--code-bg);padding:2px 6px;border-radius:6px;color:var(--cyan)}
.doc__content pre{background:var(--code-bg);border:1px solid var(--hairline);border-radius:var(--radius-sm);padding:16px 18px;overflow:auto;margin:0 0 20px;font-family:var(--font-mono);font-size:13.5px;line-height:1.7;color:var(--code-text)}
.doc__content pre code{background:none;padding:0;color:inherit;font-size:inherit}
.doc__content pre .k{color:var(--cyan)}
.doc__content pre .s{color:var(--accent-2)}
.doc__content pre .c{color:var(--text-faint)}

.callout{display:flex;gap:14px;padding:16px 18px;border-radius:var(--radius-sm);margin:0 0 20px;font-size:14.5px;line-height:1.65;border:1px solid var(--glass-border)}
.callout svg{width:20px;height:20px;flex:none;margin-top:2px}
.callout--tip{background:color-mix(in srgb,var(--cyan) 10%,transparent);border-color:color-mix(in srgb,var(--cyan) 35%,transparent)}
.callout--tip svg{color:var(--cyan)}
.callout--warn{background:color-mix(in srgb,var(--accent-2) 10%,transparent);border-color:color-mix(in srgb,var(--accent-2) 35%,transparent)}
.callout--warn svg{color:var(--accent-2)}
.callout strong{color:var(--text)}

/* 相关推荐 */
.doc__related{max-width:760px;margin:60px auto 0;padding-top:40px;border-top:1px solid var(--hairline)}
.doc__related h3{font-size:20px;font-weight:800;margin-bottom:20px;letter-spacing:-.01em}
.rel-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.rel-card{display:block;padding:18px;border-radius:var(--radius-sm);background:var(--glass-bg);border:1px solid var(--glass-border);transition:transform .3s var(--ease),border-color .3s var(--ease)}
.rel-card:hover{transform:translateY(-4px);border-color:var(--glass-border-strong)}
.rel-card__src{font-family:var(--font-mono);font-size:11.5px;color:var(--text-faint);margin-bottom:8px}
.rel-card__title{font-size:15px;font-weight:700;line-height:1.4;margin-bottom:6px}
.rel-card__desc{font-size:13.5px;color:var(--text-muted);line-height:1.55}
.rel-card__go{margin-top:10px;display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--accent);font-weight:600}
.rel-card__go svg{width:14px;height:14px}

/* 上一篇/下一篇 */
.doc__pager{max-width:760px;margin:36px auto 0;display:flex;justify-content:space-between;gap:14px}
.doc__pager a{flex:1;padding:16px 18px;border-radius:var(--radius-sm);background:var(--glass-bg);border:1px solid var(--glass-border);transition:border-color .3s var(--ease),transform .3s var(--ease)}
.doc__pager a:hover{border-color:var(--glass-border-strong);transform:translateY(-3px)}
.doc__pager .dir{font-size:12px;color:var(--text-faint);font-family:var(--font-mono);margin-bottom:6px}
.doc__pager .ttl{font-size:14.5px;font-weight:700}
.doc__pager .next{text-align:right}

/* ============================================================
   文档表格：统一卡片化 + 列对齐
   说明：此前 style.css 没有任何表格样式，全站 30 张 <table>
   均依赖浏览器默认渲染（无边框/无内边距/表头居中），
   此处统一为一套与玻璃卡片体系一致的对齐组件。
   ============================================================ */
.doc__content table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 22px;
  font-size:14.5px;
  border:1px solid var(--glass-border);
  border-radius:var(--radius-sm);
  overflow:hidden;
  background:var(--glass-bg);
}
.doc__content thead th{
  text-align:left;
  font-weight:700;
  color:var(--text);
  padding:13px 15px;
  background:var(--glass-bg-strong);
  border-bottom:1px solid var(--glass-border-strong);
}
.doc__content tbody td{
  padding:12px 15px;
  border-bottom:1px solid var(--hairline);
  color:var(--text-muted);
  vertical-align:top;
  line-height:1.6;
}
.doc__content tbody td strong{color:var(--text)}
.doc__content tbody td code{font-family:var(--font-mono);font-size:13px}
.doc__content tbody tr:last-child td{border-bottom:none}
.doc__content tbody tr:hover{background:color-mix(in srgb,var(--accent) 7%,transparent)}

/* 桌面端：doc__head 与正文同列对齐（head 已移入 doc__layout 作为首子元素） */
@media (min-width:1001px){
  .doc__layout{grid-template-columns:220px 1fr;gap:48px;align-items:start}
  .doc__toc{grid-column:1;grid-row:1 / -1}
  .doc__head{grid-column:2;grid-row:1}
  .doc__content{grid-column:2;grid-row:2;max-width:760px;margin:0}
}

/* ============================================================
   入场动画（IntersectionObserver）
   ============================================================ */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease), transform .7s var(--ease)}
.reveal.is-visible{opacity:1;transform:translateY(0)}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1000px){
  .doc__layout{grid-template-columns:1fr;gap:24px}
  .doc__toc{display:none}
}
@media (max-width:920px){
  .hero__grid{grid-template-columns:1fr;gap:48px}
  .mockup-stage{perspective:none;max-width:460px;margin:0 auto}
  .mockup{transform:none;animation:none}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .nav__links{display:none}
  .nav__burger{display:grid}
  .hero__visual .badge-float{display:none}
}
@media (max-width:600px){
  .feat-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:1fr}
  .rel-grid{grid-template-columns:1fr}
  .section{padding:84px 0}
  .hero{padding:140px 0 60px}
  .form{flex-direction:column}
  .form__btn{width:100%}
  .carousel__btn{display:none}
  .quote-card{padding:30px 22px}
  .doc__pager{flex-direction:column}
  .doc__content table{font-size:12.5px}
  .doc__content thead th,.doc__content tbody td{padding:10px 11px}
}

/* ============================================================
   AI 周报页
   ============================================================ */
.rhero{padding:150px 0 40px;text-align:center}
.rhero__title{font-size:clamp(34px,6vw,58px);font-weight:800;letter-spacing:-.02em;margin:14px 0 16px}
.rhero__sub{max-width:680px;margin:0 auto;color:var(--text-muted);font-size:17px}
.rhero__meta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:26px}
.rhero__issue,.rhero__date,.rhero__count{font-size:14px;padding:8px 16px;border:1px solid var(--glass-border);border-radius:var(--radius-pill);background:var(--glass-bg);backdrop-filter:blur(12px)}
.rhero__issue{color:var(--accent-2);font-weight:600}
.rhero__count{color:var(--cyan)}

.rpoints{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.rpoint{position:relative;padding:26px 22px 22px;border-radius:var(--radius)}
.rpoint__no{font-family:var(--font-mono);font-size:13px;color:var(--accent-2);font-weight:600}
.rpoint p{margin-top:10px;color:var(--text-muted);font-size:15px}
.rpoint strong{color:var(--text)}

.rcats{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:start}
.rcat{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius);padding:22px;backdrop-filter:blur(14px);box-shadow:var(--shadow)}
.rcat__head{display:flex;align-items:center;gap:10px;font-weight:700;font-size:16px;margin-bottom:16px;flex-wrap:wrap}
.rcat__dot{width:10px;height:10px;border-radius:50%}
.rcat__dot--news{background:var(--accent-2)}
.rcat__dot--tech{background:var(--cyan)}
.rcat__dot--paper{background:var(--accent)}
.rcat__src{font-size:12px;font-weight:500;color:var(--text-faint);margin-left:auto}

.ritem{display:block;padding:16px;margin-bottom:12px;border-radius:var(--radius-sm);background:var(--glass-bg-strong);border:1px solid var(--glass-border);transition:transform .25s var(--ease),border-color .25s var(--ease)}
.ritem:last-child{margin-bottom:0}
a.ritem:hover{transform:translateY(-3px);border-color:var(--glass-border-strong)}
.ritem__tag{display:inline-block;font-size:11px;font-weight:600;padding:3px 9px;border-radius:var(--radius-pill);background:var(--grad);color:#fff;margin-bottom:8px}
.ritem__title{font-weight:600;font-size:15px;line-height:1.45}
.ritem__val{margin-top:6px;font-size:13.5px;color:var(--text-muted);line-height:1.55}
.ritem__link{margin-top:10px;display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--accent-2);font-weight:600}
.ritem__link svg{width:15px;height:15px}

.archive{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:720px}
.archive__item{display:flex;align-items:center;gap:16px;padding:18px 22px;border-radius:var(--radius)}
.archive__no{font-weight:700}
.archive__date{color:var(--text-muted);font-size:14px}
.archive__go{margin-left:auto;display:inline-flex;align-items:center;gap:6px;color:var(--accent-2);font-weight:600;font-size:14px}
.archive__item--soon{opacity:.7}
.archive__item--soon .archive__go{color:var(--text-faint)}

@media (max-width:920px){
  .rpoints{grid-template-columns:repeat(2,1fr)}
  .rcats{grid-template-columns:1fr}
}
@media (max-width:600px){
  .rpoints{grid-template-columns:1fr}
  .archive{grid-template-columns:1fr}
}

/* 降低动态偏好：塌缩为纯静态布局 */
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important}
  .reveal{opacity:1 !important;transform:none !important}
  .mockup{transform:none !important}
}