/* ===== 基础 ===== */
:root{
  --ink:#0b1220;
  --ink-2:#334155;
  --ink-3:#64748b;
  --line:#e6e9ef;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --accent:#2563eb;
  --accent-2:#0ea5e9;
  --accent-soft:#eaf2ff;
  --radius:16px;
  --shadow-sm:0 1px 2px rgba(16,24,40,.06), 0 4px 12px rgba(16,24,40,.05);
  --shadow-lg:0 18px 50px rgba(16,24,40,.12);
  --maxw:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== 导航 ===== */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .25s, box-shadow .25s;
}
.nav.scrolled{border-bottom-color:var(--line);box-shadow:0 2px 20px rgba(16,24,40,.06)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.monogram{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  color:#fff;font-size:13px;letter-spacing:.5px;
}
.brand-text em{display:block;font-style:normal;font-size:11px;color:var(--ink-3);font-weight:500;letter-spacing:1px}
.nav-links{display:flex;align-items:center;gap:26px;font-size:14.5px;color:var(--ink-2)}
.nav-links a:hover{color:var(--accent)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:32px;height:24px;position:relative}
.nav-toggle span{display:block;height:2px;background:var(--ink);border-radius:2px;margin:5px 0;transition:.25s}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform .18s, box-shadow .18s, background .18s, color .18s;
}
.btn-sm{padding:8px 16px;font-size:14px;background:var(--ink);color:#fff}
.btn-sm:hover{background:var(--accent)}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 8px 22px rgba(37,99,235,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(37,99,235,.34)}
.btn-ghost{border:1.5px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{transform:translateY(-2px)}
.btn-outline-light{border:1.5px solid rgba(255,255,255,.5);color:#fff}
.btn-outline-light:hover{background:rgba(255,255,255,.12)}

/* ===== Hero ===== */
.hero{position:relative;padding:80px 0 70px;overflow:hidden}
.hero-glow{
  position:absolute;inset:-30% -10% auto -10%;height:760px;z-index:0;
  background:
    radial-gradient(45% 45% at 22% 18%, rgba(37,99,235,.16), transparent 70%),
    radial-gradient(40% 40% at 78% 22%, rgba(14,165,233,.14), transparent 70%),
    radial-gradient(35% 35% at 55% 60%, rgba(99,102,241,.10), transparent 70%);
}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero-copy{min-width:0}
.hero-card{min-width:0}
.tag{
  display:inline-block;padding:6px 14px;border-radius:999px;font-size:13px;font-weight:600;
  background:var(--accent-soft);color:var(--accent);margin-bottom:20px;
}
.hero h1{
  font-size:clamp(32px,4.6vw,54px);line-height:1.22;letter-spacing:-.5px;font-weight:800;margin-bottom:20px;
  text-wrap:balance;
}
.grad{
  background:linear-gradient(120deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.lead{font-size:17.5px;color:var(--ink-2);max-width:620px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:22px}
.hero-meta{font-size:14px;color:var(--ink-3);display:flex;align-items:center;gap:8px}
.dot{width:8px;height:8px;border-radius:50%;background:#22c55e;display:inline-block;box-shadow:0 0 0 4px rgba(34,197,94,.16)}

/* 代码卡片 */
.card-monitor{
  background:#0b1220;border-radius:18px;overflow:hidden;box-shadow:var(--shadow-lg);
  border:1px solid #1e293b;min-width:0;
}
.monitor-bar{display:flex;gap:6px;padding:12px 16px;background:#111a2e;border-bottom:1px solid #1e293b}
.monitor-bar i{width:10px;height:10px;border-radius:50%;background:#334155;display:block}
.monitor-bar i:first-child{background:#f87171}
.monitor-bar i:nth-child(2){background:#fbbf24}
.monitor-bar i:nth-child(3){background:#4ade80}
.monitor-body{padding:22px 20px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;line-height:2}
.code-line{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c-k{color:#7dd3fc}
.c-s{color:#a5f3a0}
.c-n{color:#fbbf24}
.c-c{color:#94a3b8}

/* ===== 数据条 ===== */
.stats{
  position:relative;z-index:1;margin-top:56px;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
}
.stat{background:#fff;padding:24px 18px;text-align:center}
.stat b{display:block;font-size:32px;font-weight:800;letter-spacing:-.5px;
  background:linear-gradient(120deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;}
.stat span{font-size:13px;color:var(--ink-3)}

/* ===== Section ===== */
.section{padding:92px 0}
.section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:720px;margin-bottom:48px}
.eyebrow{display:block;font-size:12px;font-weight:700;letter-spacing:2px;color:var(--accent);margin-bottom:12px}
.eyebrow.light{color:rgba(255,255,255,.85)}
.sec-head h2{font-size:clamp(26px,3.2vw,38px);font-weight:800;letter-spacing:-.4px;margin-bottom:14px}
.sec-head p{color:var(--ink-2);font-size:16.5px}

/* ===== 案例 ===== */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.case{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  cursor:pointer;transition:transform .22s, box-shadow .22s, border-color .22s;
}
.case:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#cfe0ff}
.case-shot{height:210px;overflow:hidden;background:var(--bg-soft);position:relative;border-bottom:1px solid var(--line)}
.case-shot img{width:100%;height:100%;object-fit:cover;object-position:top center;transition:transform .4s}
.case:hover .case-shot img{transform:scale(1.04)}
.case-shot::after{
  content:"点击看整页";position:absolute;left:12px;bottom:12px;
  background:rgba(11,18,32,.78);color:#fff;font-size:12px;padding:5px 12px;border-radius:999px;
  opacity:0;transition:.22s;
}
.case:hover .case-shot::after{opacity:1}
.case-body{padding:20px 22px 24px}
.case-tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.case-tags span{font-size:12px;padding:3px 10px;border-radius:6px;background:var(--accent-soft);color:#1d4ed8;font-weight:600}
.case-body h3{font-size:19px;font-weight:700;margin-bottom:8px}
.case-body p{font-size:14.5px;color:var(--ink-2);margin-bottom:12px}
.case-link{display:inline-block;font-size:13.5px;font-weight:600;color:#1d4ed8;padding:4px 0}
.case-link:hover{text-decoration:underline}
/* 键盘可达：卡片聚焦态 */
.case:focus-visible{outline:3px solid var(--accent);outline-offset:3px;transform:translateY(-6px);box-shadow:var(--shadow-lg)}

/* ===== 卡片网格 ===== */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px;
  transition:transform .22s, box-shadow .22s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.card-ico{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800;font-size:15px;
}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--ink-2);margin-bottom:14px}
.mini{list-style:none;border-top:1px dashed var(--line);padding-top:12px}
.mini li{font-size:13.5px;color:var(--ink-3);padding-left:16px;position:relative;margin-bottom:5px}
.mini li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--accent-2)}

/* ===== 工作习惯 ===== */
.habits{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.habit{
  display:flex;gap:18px;padding:24px 26px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);
  transition:border-color .22s, box-shadow .22s;
}
.habit:hover{border-color:#cfe0ff;box-shadow:var(--shadow-sm)}
.habit-n{
  flex:0 0 44px;height:44px;border-radius:12px;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent);font-weight:800;font-size:15px;
}
.habit-t h3{font-size:17px;font-weight:700;margin-bottom:6px}
.habit-t p{font-size:14.5px;color:var(--ink-2)}
.habit-t p strong{color:var(--ink)}

/* ===== 关于我 ===== */
.about{display:grid;grid-template-columns:1.35fr .65fr;gap:40px;align-items:start}
.timeline{list-style:none;position:relative;padding-left:28px}
.timeline::before{content:"";position:absolute;left:6px;top:8px;bottom:8px;width:2px;background:linear-gradient(180deg,var(--accent),rgba(14,165,233,.25))}
.timeline li{position:relative;padding-bottom:30px}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{
  content:"";position:absolute;left:-28px;top:7px;width:14px;height:14px;border-radius:50%;
  background:#fff;border:3px solid var(--accent);
}
.tl-time{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.3px}
.timeline h3{font-size:17.5px;font-weight:700;margin:5px 0 7px}
.timeline p{font-size:14.5px;color:var(--ink-2)}
.about-side{display:grid;gap:18px}
.side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px}
.side-card h3{font-size:15.5px;font-weight:700;margin-bottom:12px}
.checks{list-style:none}
.checks li{position:relative;padding-left:24px;font-size:14px;color:var(--ink-2);margin-bottom:8px}
.checks li::before{
  content:"✓";position:absolute;left:0;top:0;color:var(--accent-2);font-weight:800;font-size:13px;
}

/* ===== 流程 ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;position:relative}
.step{position:relative;padding:24px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);text-align:center}
.step span{
  width:34px;height:34px;border-radius:50%;display:grid;place-items:center;margin:0 auto 12px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800;font-size:15px;
}
.step h3{font-size:15.5px;font-weight:700;margin-bottom:8px}
.step p{font-size:13.5px;color:var(--ink-3)}
/* 步骤连接箭头（每行最后一个不画） */
.step:not(:nth-child(3n))::after{
  content:"→";position:absolute;right:-18px;top:50%;transform:translateY(-50%);
  color:var(--ink-3);font-size:17px;font-weight:700;z-index:1;pointer-events:none;
}

/* ===== 技术栈 ===== */
.stack-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:48px}
.pill{
  padding:9px 18px;border-radius:999px;font-size:14px;font-weight:600;
  background:#fff;border:1px solid var(--line);color:var(--ink-2);
  transition:border-color .2s, color .2s, transform .2s;
}
.pill:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.quote{
  border-left:4px solid var(--accent);padding:20px 26px;background:var(--accent-soft);border-radius:0 var(--radius) var(--radius) 0;
}
.quote p{font-size:19px;font-weight:600;color:var(--ink);line-height:1.6}
.quote cite{display:block;margin-top:8px;font-size:13.5px;color:var(--ink-3);font-style:normal}

/* ===== GitHub 代码资产 ===== */
.gh-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.gh-count{display:flex;align-items:baseline;gap:8px;margin-bottom:12px}
.gh-count b{
  font-size:34px;font-weight:800;letter-spacing:-.5px;
  background:linear-gradient(120deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.gh-count span{font-size:13px;color:var(--ink-3)}
.gh-cta{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:32px}
.gh-note{font-size:13.5px;color:var(--ink-3)}

/* ===== CTA ===== */
.cta{
  padding:86px 0;color:#fff;text-align:center;
  background:
    radial-gradient(60% 120% at 20% 0%, rgba(14,165,233,.35), transparent 60%),
    linear-gradient(135deg,#0b1220,#16233c 60%,#0f1c33);
}
.cta h2{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:-.4px;margin-bottom:16px}
.cta p{font-size:16.5px;color:rgba(255,255,255,.8);max-width:640px;margin:0 auto 30px}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:18px}
.cta-note{font-size:13.5px;color:rgba(255,255,255,.72)}

/* ===== Footer ===== */
.footer{padding:28px 0;border-top:1px solid var(--line)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:13.5px;color:var(--ink-3);flex-wrap:wrap}
.footer-links{display:flex;gap:18px}
.footer-links a:hover{color:var(--accent)}

/* ===== 灯箱 ===== */
.lightbox{
  position:fixed;inset:0;z-index:100;background:rgba(8,12,20,.94);
  display:none;flex-direction:column;align-items:center;padding:22px 0;
}
.lightbox.open{display:flex}
.lb-close{
  position:absolute;top:18px;right:24px;width:42px;height:42px;border-radius:50%;
  background:rgba(255,255,255,.12);color:#fff;border:0;font-size:26px;cursor:pointer;line-height:1;
}
.lb-close:hover{background:rgba(255,255,255,.22)}
.lb-title{color:#fff;font-weight:700;font-size:16px;margin-bottom:14px;text-align:center;padding:0 24px}
.lb-scroll{flex:1;overflow-y:auto;width:min(900px,94vw);border-radius:12px;background:#fff}
.lb-scroll img{width:100%;height:auto}
.lb-hint{color:rgba(255,255,255,.65);font-size:12.5px;margin-top:12px}

/* ===== 动效 ===== */
/* 入场用 animation，不占用 transition 通道，hover 过渡不受影响 */
.js .reveal{opacity:0}
.js .reveal.in{opacity:1;animation:revealIn .7s cubic-bezier(.2,.7,.3,1) backwards}
@keyframes revealIn{from{opacity:0;transform:translateY(22px)}}
.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}
.nowrap{white-space:nowrap}

/* 弱化动态：尊重系统设置 */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;animation:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .cases{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .about{grid-template-columns:1fr;gap:32px}
}
@media (max-width:720px){
  .nav-links{
    position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;
    gap:0;padding:8px 24px 18px;border-bottom:1px solid var(--line);display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-links .btn{margin-top:12px}
  .nav-toggle{display:block}
  .hero{padding:52px 0 48px}
  .section{padding:64px 0}
  .stats{grid-template-columns:repeat(2,1fr)}
  .cases,.grid-3,.habits{grid-template-columns:1fr}
  .gh-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step:not(:nth-child(3n))::after{display:none}
  .brand-text em{display:none}
}