/* ==========================================================================
   个人主页样式 · 现代设计系统（零依赖）
   主题：浅色 / 深色 自动切换，存储在 localStorage
   ========================================================================== */

:root {
  --bg: #f7f8fc;
  --bg-alt: #eef1f8;
  --surface: #ffffff;
  --surface-2: #f3f5fb;
  --text: #1a1f36;
  --muted: #5b6478;
  --border: #e3e8f2;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --accent: #06b6d4;
  --design: #ec4899;
  --tech: #0ea5e9;
  --shadow: 0 10px 30px -12px rgba(30, 41, 80, 0.18);
  --shadow-lg: 0 24px 60px -20px rgba(30, 41, 80, 0.28);
  --radius: 16px;
  --maxw: 1080px;
}

[data-theme="dark"] {
  --bg: #0a0e1a;
  --bg-alt: #0f1424;
  --surface: #141b2d;
  --surface-2: #1b2438;
  --text: #e8ecf4;
  --muted: #9aa6c0;
  --border: #25304a;
  --shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background 0.35s ease, color 0.35s ease;
}

a { color: inherit; text-decoration: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 720px; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__logo { font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.nav__logo span { color: var(--primary); }
.nav__links { display: flex; gap: 28px; }
.nav__links a {
  font-size: 0.95rem; color: var(--muted); font-weight: 500;
  transition: color 0.2s; position: relative;
}
.nav__links a:hover { color: var(--text); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px; height: 2px; width: 0;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  transition: width 0.25s;
}
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  background: var(--surface-2); border: 1px solid var(--border);
  width: 40px; height: 40px; border-radius: 12px; cursor: pointer;
  display: grid; place-items: center; color: var(--text);
  transition: transform 0.2s, background 0.2s;
}
.theme-toggle:hover { transform: translateY(-2px); }
.theme-toggle svg { stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
.nav__burger { display: none; background: none; border: none; cursor: pointer; flex-direction: column; gap: 5px; }
.nav__burger span { width: 22px; height: 2px; background: var(--text); border-radius: 2px; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 92vh; display: grid; place-items: center; overflow: hidden; }
.hero__bg {
  position: absolute; inset: -20% -10% auto -10%; height: 140%;
  background:
    radial-gradient(40% 50% at 20% 20%, rgba(99,102,241,0.35), transparent 60%),
    radial-gradient(45% 55% at 80% 10%, rgba(139,92,246,0.30), transparent 60%),
    radial-gradient(50% 60% at 60% 90%, rgba(6,182,212,0.22), transparent 60%);
  filter: blur(10px); animation: float 14s ease-in-out infinite alternate;
}
@keyframes float { to { transform: translate3d(0, -24px, 0) scale(1.05); } }
.hero__inner { position: relative; text-align: center; padding: 40px 24px; max-width: 860px; }
.hero__avatar {
  width: 92px; height: 92px; margin: 0 auto 24px; border-radius: 50%;
  display: grid; place-items: center; font-size: 2.2rem; font-weight: 800; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: var(--shadow-lg);
}
.hero__eyebrow { color: var(--muted); font-size: 0.95rem; margin-bottom: 18px; font-weight: 500; }
.hero__title { font-size: clamp(2.2rem, 6vw, 4rem); line-height: 1.1; letter-spacing: -0.03em; font-weight: 800; }
.grad {
  background: linear-gradient(120deg, var(--primary), var(--primary-2), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__lead { margin: 22px auto 32px; max-width: 640px; color: var(--muted); font-size: 1.05rem; }
.hero__lead strong { color: var(--text); }
.hero__cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero__stats {
  margin-top: 44px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
}
.hero__stats div {
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 22px; min-width: 96px; box-shadow: var(--shadow);
}
.hero__stats strong { display: block; font-size: 1.4rem; font-weight: 800; }
.hero__stats span { font-size: 0.8rem; color: var(--muted); }
.hero__scroll {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  font-size: 1.6rem; color: var(--muted); animation: bob 1.8s ease-in-out infinite;
}
@keyframes bob { 50% { transform: translate(-50%, 10px); } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 12px 22px;
  border-radius: 12px; font-weight: 600; font-size: 0.95rem; cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s; border: 1px solid transparent;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: var(--shadow); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--outline { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--outline:hover { box-shadow: var(--shadow); }

/* ---------- 通用 section ---------- */
.section { padding: 96px 0; }
.section--alt { background: var(--bg-alt); }
.section__title { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; letter-spacing: -0.02em; text-align: center; }
.section__sub { text-align: center; color: var(--muted); margin-top: 12px; margin-bottom: 48px; }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: start; }
.about__text p { margin-bottom: 18px; color: var(--muted); }
.about__text strong { color: var(--text); }
.about__note {
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--primary);
  padding: 16px 18px; border-radius: 12px; font-size: 0.95rem;
}
.about__note em { color: var(--primary); font-style: normal; font-weight: 600; }
.about__cards { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.mini-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); transition: transform 0.25s, box-shadow 0.25s;
}
.mini-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.mini-card__icon { font-size: 1.8rem; margin-bottom: 10px; }
.mini-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.mini-card p { font-size: 0.88rem; color: var(--muted); }

/* ---------- 技能 ---------- */
.skills { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.skill-group {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow);
}
.skill-group h3 { font-size: 1.1rem; margin-bottom: 18px; }
.skill-group ul { list-style: none; display: grid; gap: 14px; }
.skill-group li { display: grid; gap: 6px; font-size: 0.92rem; }
.skill-group li span { color: var(--muted); }
.bar {
  height: 8px; border-radius: 99px; background: var(--surface-2); position: relative; overflow: hidden;
}
.bar::after {
  content: ""; position: absolute; inset: 0; width: var(--v);
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
  border-radius: 99px; transform-origin: left; animation: grow 1.1s cubic-bezier(.2,.8,.2,1) both;
}
@keyframes grow { from { transform: scaleX(0); } }

/* ---------- 项目卡片 ---------- */
.projects { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow); position: relative;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.card--highlight { border-color: color-mix(in srgb, var(--design) 35%, var(--border)); }
.card--highlight:hover { border-color: var(--design); }
.card__tag {
  align-self: flex-start; font-size: 0.72rem; font-weight: 700; padding: 4px 10px; border-radius: 99px;
  margin-bottom: 14px; letter-spacing: 0.02em;
}
.card__tag--tech { background: color-mix(in srgb, var(--tech) 16%, transparent); color: var(--tech); }
.card__tag--design { background: color-mix(in srgb, var(--design) 16%, transparent); color: var(--design); }
.card h3 { font-size: 1.18rem; margin-bottom: 10px; }
.card__desc { color: var(--muted); font-size: 0.92rem; flex: 1; }
.card__stack { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
.card__stack span {
  font-size: 0.76rem; padding: 4px 10px; border-radius: 8px;
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border);
}
.card__links { display: flex; gap: 18px; }
.card__links a { color: var(--primary); font-weight: 600; font-size: 0.9rem; }
.card__links a:hover { text-decoration: underline; }

/* ---------- 数值专版 ---------- */
.design { display: grid; gap: 18px; }
.design__item {
  display: flex; gap: 20px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow);
}
.design__num {
  font-size: 1.5rem; font-weight: 800; color: transparent;
  background: linear-gradient(135deg, var(--design), var(--primary-2));
  -webkit-background-clip: text; background-clip: text; flex-shrink: 0; min-width: 44px;
}
.design__item h3 { font-size: 1.1rem; margin-bottom: 6px; }
.design__item p { color: var(--muted); font-size: 0.93rem; }
.design__cta { display: flex; gap: 14px; justify-content: center; margin-top: 36px; flex-wrap: wrap; }

/* ---------- 简历 ---------- */
.resume-box {
  text-align: center; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 44px; box-shadow: var(--shadow);
}
.resume-box__icon { font-size: 2.6rem; margin-bottom: 12px; }
.resume-box h3 { font-size: 1.3rem; margin-bottom: 10px; }
.resume-box p { color: var(--muted); max-width: 480px; margin: 0 auto 24px; }
.resume-box__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact__item {
  display: flex; gap: 16px; align-items: center; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow); transition: transform 0.2s, box-shadow 0.2s;
}
.contact__item:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.contact__ic { font-size: 1.6rem; }
.contact__item strong { display: block; font-size: 0.85rem; color: var(--muted); font-weight: 600; }
.contact__item span span { font-size: 1rem; }

/* ---------- Footer ---------- */
.footer { padding: 40px 0; border-top: 1px solid var(--border); text-align: center; color: var(--muted); }
.footer__hint { font-size: 0.82rem; margin-top: 6px; opacity: 0.8; }

/* ---------- 滚动揭示动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .about, .skills, .projects, .contact { grid-template-columns: 1fr; }
  .about__cards { grid-template-columns: 1fr 1fr; }
  .nav__links {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 10px 24px 20px; transform: translateY(-130%); transition: transform 0.3s; box-shadow: var(--shadow);
  }
  .nav__links.open { transform: none; }
  .nav__links a { padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav__burger { display: flex; }
}
@media (max-width: 520px) {
  .about__cards, .contact { grid-template-columns: 1fr; }
  .section { padding: 72px 0; }
  .hero__stats div { min-width: 78px; padding: 12px 14px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* 自动追加：李俊彦定制补丁 */
.hero__avatar { width: 110px; height: 110px; font-size: 1.25rem; letter-spacing: 0.05em; }