/* ============ 基础 ============ */
:root{
  --bg:#ffffff;
  --bg-soft:#f6f8fc;
  --bg-alt:#f1f5fb;
  --ink:#0f172a;
  --ink-2:#334155;
  --ink-3:#64748b;
  --line:#e6ebf3;
  --primary:#4f46e5;
  --primary-2:#7c3aed;
  --cyan:#06b6d4;
  --radius:16px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06), 0 2px 8px rgba(15,23,42,.04);
  --shadow:0 4px 12px rgba(15,23,42,.06), 0 16px 40px rgba(15,23,42,.08);
  --shadow-lg:0 18px 50px rgba(15,23,42,.12);
  --maxw:1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{margin:0;line-height:1.3;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 18px;border-radius:10px;
  font-size:14px;font-weight:600;white-space:nowrap;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
}
.btn-lg{height:48px;padding:0 26px;font-size:15px;border-radius:12px}
.btn-white{color:var(--primary);background:#fff;box-shadow:0 8px 22px rgba(15,23,42,.18)}
.btn-white:hover{transform:translateY(-2px)}
.btn-outline{color:#fff;border:1px solid rgba(255,255,255,.55)}
.btn-outline:hover{background:rgba(255,255,255,.12);transform:translateY(-2px)}

/* ============ 导航 ============ */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.nav.stuck{border-bottom-color:var(--line);box-shadow:0 4px 20px rgba(15,23,42,.05)}
.nav-inner{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-logo{display:block;height:40px;width:auto;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:15.5px;letter-spacing:-.2px}
.brand-text i{font-size:10.5px;font-style:normal;color:var(--ink-3);letter-spacing:.4px}

/* ============ Hero ============ */
.hero{position:relative;overflow:hidden;padding:78px 0 72px;background:linear-gradient(180deg,#f8f9ff 0%,#ffffff 62%)}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.grid-lines{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(99,102,241,.055) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(99,102,241,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 35%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,#000 35%,transparent 100%);
}
.orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5}
.orb-1{width:420px;height:420px;top:-120px;left:-100px;background:#6366f1}
.orb-2{width:380px;height:380px;top:-40px;right:-80px;background:#c026d3;opacity:.32}
.orb-3{width:320px;height:320px;bottom:-140px;left:38%;background:#06b6d4;opacity:.28}

.hero-inner{position:relative;display:grid;grid-template-columns:1.06fr .94fr;gap:56px;align-items:center}
h1{font-size:min(48px,3.7vw);font-weight:800;margin:20px 0 18px;letter-spacing:-1.4px;white-space:nowrap}
.grad{
  background:linear-gradient(120deg,#4f46e5,#9333ea 45%,#db2777);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{font-size:16.5px;color:var(--ink-2);max-width:560px}

/* Hero 可视化 */
.hero-visual{position:relative}
.console{
  border-radius:18px;background:#fff;border:1px solid var(--line);
  box-shadow:var(--shadow-lg);overflow:hidden;
}
.console-bar{
  display:flex;align-items:center;gap:7px;height:40px;padding:0 16px;
  background:linear-gradient(180deg,#f8fafc,#f1f5f9);border-bottom:1px solid var(--line);
}
.tl{width:10px;height:10px;border-radius:50%;background:#dbe3ef}
.tl:nth-child(1){background:#f87171}
.tl:nth-child(2){background:#fbbf24}
.tl:nth-child(3){background:#34d399}
.console-bar em{margin-left:10px;font-size:12px;font-style:normal;color:var(--ink-3)}
.console-body{padding:18px}
.row{display:flex;align-items:flex-start;gap:10px}
.row p{font-size:13px;color:var(--ink-2);line-height:1.6}
.tag{flex:none;font-size:11px;font-weight:700;padding:3px 9px;border-radius:6px}
.tag-cyan{color:#0e7490;background:#cffafe}
.gen{margin:14px 0 16px;display:flex;flex-direction:column;gap:9px}
.gen-line{
  height:9px;border-radius:6px;width:var(--w);
  background:linear-gradient(90deg,#e0e7ff,#ede9fe);position:relative;overflow:hidden;
}
.gen-line::after{
  content:"";position:absolute;inset:0;transform:translateX(-100%);
  background:linear-gradient(90deg,transparent,rgba(129,140,248,.55),transparent);
  animation:sweep 2.6s ease-in-out infinite;
}
.gen-line:nth-child(2){animation-delay:.2s}
.gen-line:nth-child(2)::after{animation-delay:.25s}
.gen-line:nth-child(3)::after{animation-delay:.5s}
.gen-line:nth-child(4)::after{animation-delay:.75s}
@keyframes sweep{0%{transform:translateX(-100%)}55%,100%{transform:translateX(100%)}}

.row-cards{gap:10px}
.mini{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;
  padding:14px 6px;border-radius:12px;border:1px solid var(--line);background:#fbfcfe;
  font-size:12px;color:var(--ink-2);transition:transform .18s,box-shadow .18s,border-color .18s;
}
.mini:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#ddd6fe}
.mini svg{width:20px;height:20px}
.mini-img{color:#4f46e5}.mini-img:hover{background:#eef2ff}
.mini-txt{color:#db2777}.mini-txt:hover{background:#fdf2f8}
.mini-vid{color:#0891b2}.mini-vid:hover{background:#ecfeff}
.console-foot{
  display:flex;align-items:center;justify-content:space-between;
  margin-top:16px;padding-top:13px;border-top:1px dashed var(--line);font-size:12px;
}
.ok{color:#16a34a;font-weight:600}
.muted{color:var(--ink-3)}

.float-chip{
  position:absolute;padding:9px 14px;border-radius:12px;font-size:12.5px;color:var(--ink-2);
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);
  animation:float 5s ease-in-out infinite;
}
.float-chip b{color:var(--primary);font-weight:800}
.chip-a{left:-34px;top:24%}
.chip-b{right:-26px;bottom:12%;animation-delay:1.6s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}

/* ============ 通用区块 ============ */
.section{padding:88px 0}
.section-alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:660px;margin:0 auto 46px;text-align:center}
.eyebrow{
  display:inline-block;font-size:12px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;
  color:var(--primary);background:#eef2ff;padding:5px 12px;border-radius:999px;margin-bottom:16px;
}
.sec-head h2{font-size:34px;font-weight:800;letter-spacing:-.8px}
.sec-head p{margin-top:14px;font-size:15.5px;color:var(--ink-3)}

/* ============ 模块卡片 ============ */
.module-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.mcard{
  position:relative;display:flex;flex-direction:column;text-align:left;
  padding:26px 22px 22px;border-radius:var(--radius);
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-sm);
  overflow:hidden;transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.mcard::before{
  content:"";position:absolute;inset:0;opacity:0;transition:opacity .22s ease;
  background:linear-gradient(150deg,color-mix(in srgb,var(--c1) 10%,transparent),color-mix(in srgb,var(--c2) 10%,transparent));
}
.mcard:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.mcard:hover::before{opacity:1}
.mcard > *{position:relative}
.mcard-ico{
  display:grid;place-items:center;width:46px;height:46px;border-radius:13px;padding:11px;color:#fff;
  background:linear-gradient(135deg,var(--c1),var(--c2));
  box-shadow:0 8px 18px color-mix(in srgb,var(--c1) 32%,transparent);
}
.mcard h3{font-size:19px;font-weight:750;margin:18px 0 8px}
.mcard p{font-size:13.5px;color:var(--ink-3);min-height:52px}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin:14px 0 16px}
.chips li{font-size:12px;color:var(--ink-2);background:#f1f5f9;border:1px solid var(--line);padding:4px 10px;border-radius:999px}
.mcard-arrow{font-size:13px;font-weight:600;color:var(--c1);margin-top:auto}

/* ============ 学习路径 ============ */
.path{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.path li{
  position:relative;padding:28px 22px;border-radius:var(--radius);background:#fff;
  border:1px solid var(--line);box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s;
}
.path li:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.path li:not(:last-child)::after{
  content:"";position:absolute;right:-13px;top:50%;width:16px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,#c7d2fe,#e9d5ff);
}
.step{
  display:inline-grid;place-items:center;width:38px;height:38px;border-radius:11px;
  font-size:14px;font-weight:800;color:#fff;background:linear-gradient(135deg,#4f46e5,#a855f7);
  box-shadow:0 6px 14px rgba(99,102,241,.3);margin-bottom:14px;
}
.path h4{font-size:16.5px;font-weight:750;margin-bottom:8px}
.path p{font-size:13.5px;color:var(--ink-3)}
.meta{
  display:inline-block;margin-top:14px;font-size:12px;color:var(--primary);
  background:#eef2ff;padding:4px 10px;border-radius:999px;
}

/* ============ CTA ============ */
.cta{padding:76px 0;background:linear-gradient(120deg,#4338ca,#7c3aed 55%,#c026d3);color:#fff}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.cta h2{font-size:30px;font-weight:800;letter-spacing:-.7px}
.cta p{margin-top:12px;font-size:15px;opacity:.9;max-width:620px}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap}

/* ============ 页脚 ============ */
.footer{padding:28px 0;background:#0f172a;color:#cbd5e1}
.f-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:#64748b;
}

/* ============ 响应式 ============ */
@media (max-width:1080px){
  .module-grid{grid-template-columns:repeat(2,1fr)}
  .path{grid-template-columns:repeat(2,1fr)}
  .path li:nth-child(2)::after{display:none}
}
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:48px}
  h1{font-size:40px}
  .float-chip{display:none}
}
@media (max-width:640px){
  .section{padding:60px 0}
  .module-grid,.path{grid-template-columns:1fr}
  .sec-head h2{font-size:26px}
  h1{font-size:32px;white-space:normal}
  .hero{padding:52px 0 48px}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}