/* ============ 设计变量 ============ */
:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --surface: #ffffff;
  --text: #14162b;
  --text-soft: #5a5f73;
  --border: #e7e9f2;
  --primary: #5b5bf0;
  --primary-2: #8b5cf6;
  --accent: #06b6d4;
  --grad: linear-gradient(120deg, #5b5bf0 0%, #8b5cf6 50%, #06b6d4 100%);
  --shadow: 0 10px 30px rgba(30, 30, 80, 0.08);
  --shadow-lg: 0 20px 60px rgba(30, 30, 80, 0.14);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1140px;
}

[data-theme="dark"] {
  --bg: #0c0e1a;
  --bg-alt: #111320;
  --surface: #161a2b;
  --text: #eef0fa;
  --text-soft: #a6adcb;
  --border: #262b42;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.6);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

/* ============ 通用按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; font-weight: 600; font-size: 14px;
  border: 1px solid transparent; cursor: pointer; transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px rgba(91, 91, 240, .35); }
.btn--ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn--ghost:hover { background: var(--bg-alt); }
.btn--lg { padding: 14px 26px; font-size: 16px; }

/* ============ 导航 ============ */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 800; }
.brand__mark { font-size: 22px; }
.brand__name { font-size: 19px; letter-spacing: .3px; }
.brand__tag { font-size: 12px; color: var(--text-soft); border-left: 1px solid var(--border); padding-left: 8px; margin-left: 2px; }
.nav__links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; color: var(--text-soft); }
.nav__links a { position: relative; padding: 4px 0; transition: color .2s; }
.nav__links a:hover { color: var(--text); }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 2px; background: var(--grad); transition: width .2s; }
.nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: 10px; }

/* ============ Hero ============ */
.hero { position: relative; overflow: hidden; padding: 100px 20px 80px; }
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.orb { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .55; }
.orb--1 { width: 420px; height: 420px; background: #7c6cff; top: -120px; left: -80px; }
.orb--2 { width: 380px; height: 380px; background: #16d3e6; bottom: -140px; right: -60px; }
.orb--3 { width: 300px; height: 300px; background: #ff8fd0; top: 40%; left: 55%; opacity: .35; }
.grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 46px 46px; opacity: .25;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
}
.hero__inner { position: relative; z-index: 1; max-width: 880px; margin: 0 auto; text-align: center; }
.pill {
  display: inline-block; padding: 7px 16px; border-radius: 999px;
  background: color-mix(in srgb, var(--primary) 12%, transparent); color: var(--primary);
  font-size: 13px; font-weight: 600; border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent);
}
.hero__title { font-size: clamp(34px, 6vw, 60px); line-height: 1.15; margin: 22px 0 18px; font-weight: 850; letter-spacing: -1px; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__sub { font-size: clamp(15px, 2vw, 19px); color: var(--text-soft); max-width: 640px; margin: 0 auto 30px; }
.hero__cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============ 区块 ============ */
.section { max-width: var(--maxw); margin: 0 auto; padding: 80px 20px; }
.section--alt { max-width: none; background: var(--bg-alt); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head { text-align: center; margin-bottom: 46px; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 700; color: var(--primary); letter-spacing: 1px; text-transform: uppercase; }
.section__head h2 { font-size: clamp(26px, 4vw, 38px); margin: 12px 0 10px; font-weight: 800; }
.section__head p { color: var(--text-soft); font-size: 16px; }
.section__head a { color: var(--primary); font-weight: 600; }
.section__head a:hover { text-decoration: underline; }

/* ============ 卡片 ============ */
.cards { display: grid; gap: 22px; }
.cards--3 { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.card__icon { font-size: 32px; margin-bottom: 14px; }
.card h3 { font-size: 19px; margin-bottom: 8px; }
.card p { color: var(--text-soft); font-size: 15px; }

/* ============ 对比表 ============ */
.callout {
  display: grid; grid-template-columns: 0.8fr 1.6fr; gap: 28px; align-items: center;
  margin-top: 48px; padding: 32px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
}
.callout__left h3 { font-size: 22px; margin-bottom: 8px; }
.callout__left p { color: var(--text-soft); }
.compare { width: 100%; border-collapse: collapse; font-size: 14px; }
.compare th, .compare td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.compare th { background: var(--bg-alt); font-weight: 700; }
.compare td:first-child { font-weight: 700; color: var(--text); }
.compare tbody tr:hover { background: var(--bg-alt); }

/* ============ 精选技能库 ============ */
.skills__tools { display: flex; justify-content: center; margin-bottom: 26px; }
.search { position: relative; width: 100%; max-width: 560px; }
.search__icon { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); font-size: 16px; opacity: .55; pointer-events: none; }
.search input {
  width: 100%; padding: 13px 16px 13px 44px; font-size: 15px;
  border-radius: 999px; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.search input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent); }

.chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 38px; }
.chip {
  padding: 8px 16px; border-radius: 999px; font-size: 14px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border); color: var(--text-soft); transition: all .2s;
}
.chip:hover { border-color: var(--primary); color: var(--text); }
.chip.is-active { background: var(--grad); color: #fff; border-color: transparent; }

.cat-group { margin-bottom: 46px; }
.cat-group__head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.cat-group__emoji { font-size: 28px; }
.cat-group__head h3 { font-size: 20px; }
.cat-group__head span { font-size: 13px; color: var(--text-soft); }

.skillgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.skill {
  display: flex; flex-direction: column; gap: 12px; padding: 24px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s, border-color .2s;
}
.skill:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.skill__top { display: flex; align-items: flex-start; gap: 12px; }
.skill__emoji { width: 46px; height: 46px; flex: 0 0 46px; display: grid; place-items: center; font-size: 24px; border-radius: 12px; background: var(--bg-alt); border: 1px solid var(--border); }
.skill__title { font-size: 17px; font-weight: 700; line-height: 1.3; }
.skill__cat { font-size: 12px; color: var(--primary); font-weight: 600; }
.skill__desc { color: var(--text-soft); font-size: 14px; flex: 1; }
.skill__meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-soft); border-top: 1px solid var(--border); padding-top: 12px; margin-top: 2px; }
.skill__meta b { color: var(--text); font-weight: 700; }
.skill__link { align-self: flex-start; margin-top: auto; font-size: 14px; font-weight: 600; color: var(--primary); }
.skill__link:hover { text-decoration: underline; }
.badge--api {
  margin-left: auto; font-size: 11px; padding: 3px 9px; border-radius: 999px; white-space: nowrap;
  background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.empty { text-align: center; color: var(--text-soft); font-size: 15px; padding: 50px 0; }
.source-note { text-align: center; color: var(--text-soft); font-size: 13px; margin-top: 28px; }

/* ============ 页脚 ============ */
.footer { background: var(--bg-alt); border-top: 1px solid var(--border); margin-top: 40px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 48px 20px 24px; display: grid; grid-template-columns: 1.4fr 2fr; gap: 30px; }
.footer__brand .brand__name { font-size: 20px; font-weight: 800; }
.footer__brand p { color: var(--text-soft); margin-top: 10px; font-size: 14px; }
.footer__cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.footer__cols h4 { font-size: 14px; margin-bottom: 12px; }
.footer__cols a { display: block; color: var(--text-soft); font-size: 14px; padding: 4px 0; transition: color .2s; }
.footer__cols a:hover { color: var(--primary); }
.footer__contact-line { display: block; color: var(--text-soft); font-size: 14px; padding: 4px 0; }
.footer__bottom { max-width: var(--maxw); margin: 0 auto; padding: 16px 20px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; font-size: 13px; color: var(--text-soft); }
.footer__beian { display: inline-flex; align-items: center; gap: 6px; color: var(--text-soft); transition: color .2s; }
.footer__beian:hover { color: var(--primary); }
.footer__beian img { width: 16px; height: 16px; display: block; flex: none; }
.footer__disclaimer { max-width: var(--maxw); margin: 0 auto; padding: 0 20px 24px; }
.footer__disclaimer p { font-size: 12.5px; line-height: 1.75; color: var(--text-soft); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px 18px; }
.footer__disclaimer a { color: var(--primary); }

/* ============ 响应式 ============ */
@media (max-width: 900px) {
  .cards--3 { grid-template-columns: repeat(2, 1fr); }
  .skillgrid { grid-template-columns: repeat(2, 1fr); }
  .callout { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; }
  .footer__cols { grid-template-columns: repeat(2, 1fr); }
  .nav__links { display: none; }
}
@media (max-width: 560px) {
  .cards--3, .skillgrid { grid-template-columns: 1fr; }
  .footer__cols { grid-template-columns: 1fr; }
}