/* ---------- 设计变量 ---------- */
:root {
  --bg: #fbfaf8;
  --bg-elev: #ffffff;
  --text: #17171b;
  --text-muted: #62626f;
  --border: #e7e4dd;
  --accent: #0f766e;
  --accent-2: #0369a1;
  --shadow: 0 1px 2px rgb(0 0 0 / 4%), 0 8px 24px -12px rgb(0 0 0 / 12%);

  --max: 1080px;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

:root[data-theme="dark"] {
  --bg: #0b0b0e;
  --bg-elev: #131318;
  --text: #f2f2f5;
  --text-muted: #9b9baa;
  --border: #26262f;
  --accent: #5eead4;
  --accent-2: #7dd3fc;
  --shadow: 0 1px 2px rgb(0 0 0 / 40%), 0 12px 32px -16px rgb(0 0 0 / 70%);
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.022em; margin: 0; font-weight: 700; }
p { margin: 0; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }

::selection { background: color-mix(in srgb, var(--accent) 28%, transparent); }

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: .6rem 1rem;
  background: var(--bg-elev);
  z-index: 100;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.1rem clamp(1.25rem, 5vw, 3rem);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
}

.brand {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
}
.brand-dot { color: var(--accent); margin: 0 .08em; }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(.9rem, 2.5vw, 1.6rem);
  font-size: .94rem;
}
.site-nav a {
  text-decoration: none;
  color: var(--text-muted);
  transition: color .18s ease;
}
.site-nav a:hover { color: var(--text); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--bg-elev);
  color: var(--text-muted);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-muted); }
.theme-toggle svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ---------- 布局 ---------- */
main > .section,
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 3rem);
}

/* 注意：要用同优先级选择器，否则会被上面的 `main > .section` 简写 padding 覆盖 */
main > .section { padding-top: clamp(3.5rem, 9vw, 6.5rem); }

/* 锚点跳转时避开吸顶导航 */
section[id] { scroll-margin-top: 88px; }
.section-head { margin-bottom: 2rem; }
.section-head h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); }
.section-head p { margin-top: .55rem; color: var(--text-muted); font-size: 1rem; }

/* ---------- Hero ---------- */
.hero {
  padding-top: clamp(4rem, 13vw, 8.5rem);
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  max-width: calc(var(--max) + 0px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-bottom: 1.6rem;
  padding: .32rem .8rem .32rem .62rem;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--bg-elev);
  font-size: .82rem;
  color: var(--text-muted);
}

.pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #16a34a;
  box-shadow: 0 0 0 0 rgb(22 163 74 / 55%);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  70%  { box-shadow: 0 0 0 7px rgb(22 163 74 / 0%); }
  100% { box-shadow: 0 0 0 0 rgb(22 163 74 / 0%); }
}

.hero h1 {
  font-size: clamp(2.6rem, 8.2vw, 4.9rem);
  letter-spacing: -0.038em;
  line-height: 1.06;
}

.grad {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  max-width: 33em;
  margin-top: 1.6rem;
  font-size: clamp(1.02rem, 1.7vw, 1.16rem);
  color: var(--text-muted);
}

.cta { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.2rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .72rem 1.35rem;
  border-radius: 11px;
  font-size: .96rem;
  font-weight: 550;
  text-decoration: none;
  transition: transform .16s ease, box-shadow .16s ease, background .16s ease, border-color .16s ease;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--text);
  color: var(--bg);
  box-shadow: var(--shadow);
}
.btn-primary:hover { transform: translateY(-1px); }

.btn-ghost {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--text-muted); }

/* ---------- 头像 + 首屏数据条 ---------- */
.hero-top {
  display: flex;
  align-items: center;
  gap: .9rem;
  flex-wrap: wrap;
  margin-bottom: 1.7rem;
}
.hero-top .eyebrow { margin-bottom: 0; }

.avatar {
  width: 56px;
  height: 56px;
  flex: none;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.2rem;
  max-width: 34em;
  margin: 3.2rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--border);
}
.stats dt {
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stats dd {
  margin: .15rem 0 0;
  font-size: .84rem;
  color: var(--text-muted);
}

/* ---------- 卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 38%, var(--border));
  box-shadow: var(--shadow);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.1rem;
}
.card-kicker {
  font-size: .76rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.card-link {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  font-size: .9rem;
  color: var(--text-muted);
  transition: color .18s ease, border-color .18s ease, transform .18s ease;
}
.card-link:hover { color: var(--accent); border-color: var(--accent); transform: translate(1px, -1px); }

.card h3 { font-size: 1.14rem; margin-bottom: .6rem; }
.card p { font-size: .94rem; color: var(--text-muted); }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
}
.tags li {
  padding: .18rem .6rem;
  border-radius: 6px;
  background: color-mix(in srgb, var(--text) 6%, transparent);
  font-size: .78rem;
  color: var(--text-muted);
}

.card-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  margin-top: auto;
  padding-top: 1.25rem;
  font-size: .86rem;
}
.card-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color .18s ease;
}
.card-links a:hover { color: var(--text); }
.card-links a.demo {
  color: var(--accent);
  font-weight: 550;
}
.card-links a.demo:hover { color: var(--accent-2); }

/* ---------- 关于 ---------- */
.prose { max-width: 40em; }
.prose p + p { margin-top: 1.1rem; }
.prose p { color: var(--text-muted); font-size: 1.03rem; }

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}
.skills li {
  padding: .38rem .85rem;
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: .86rem;
  color: var(--text-muted);
  background: var(--bg-elev);
}

/* ---------- 联系 ---------- */
.contact-box {
  padding: clamp(2rem, 5vw, 3.2rem);
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--bg-elev);
  box-shadow: var(--shadow);
}
.contact-box h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); }
.contact-box p { margin-top: .7rem; color: var(--text-muted); }

.mail {
  display: inline-block;
  margin-top: 1.6rem;
  font-size: clamp(1.15rem, 3.2vw, 1.7rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  border-bottom: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding-bottom: .1rem;
}

.social {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  font-size: .92rem;
}
.social a { color: var(--text-muted); text-decoration: none; }
.social a:hover { color: var(--text); text-decoration: underline; text-underline-offset: 4px; }

/* ---------- 页脚 ---------- */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.5rem;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem clamp(1.25rem, 5vw, 3rem) 2.5rem;
  font-size: .85rem;
  color: var(--text-muted);
}

/* ---------- 入场动画 ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s cubic-bezier(.22,.61,.36,1), transform .6s cubic-bezier(.22,.61,.36,1);
}
html.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
  html.js .reveal { opacity: 1; transform: none; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .site-nav { gap: .85rem; }
  .site-nav a { font-size: .88rem; }
}