/* ==========================================================================
   main.css — 全局布局、导航、页脚、通用组件
   ========================================================================== */

/* === Reset & 基础 === */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-base);
  font-size: var(--fs-base);
  line-height: var(--lh-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--duration-fast) var(--ease); }
a:hover { color: var(--color-purple); }
button { font-family: inherit; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6 { margin: 0; line-height: var(--lh-tight); color: var(--color-ink); font-weight: var(--fw-bold); }
p { margin: 0; }
input, select, textarea, button { font: inherit; color: inherit; }

/* === 布局容器 === */
.shell {
  width: min(var(--container-max), calc(100% - var(--container-pad) * 2));
  margin: 0 auto;
}

main { min-height: 60vh; }

/* === 顶部导航 === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--color-border);
}
.nav {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-weight: var(--fw-black);
  color: var(--color-ink);
  font-size: var(--fs-md);
  letter-spacing: 0;
  white-space: nowrap;
}
.brand:hover { color: var(--color-ink); }
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--gradient-hero);
  display: grid;
  place-items: center;
  color: white;
  font-weight: var(--fw-black);
  font-size: 14px;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-glow);
}
.brand-mark span { display: inline-block; }
.brand-mark-img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  object-fit: contain;
  background: white;
  padding: 2px;
  box-shadow: var(--shadow-glow);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text small { font-size: 10px; color: var(--color-light); font-weight: var(--fw-medium); letter-spacing: 0.5px; }

.nav-links {
  display: flex;
  gap: var(--sp-6);
  align-items: center;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-muted);
}
.nav-links a {
  position: relative;
  padding: 6px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: var(--gradient-cta);
  transition: width var(--duration-base) var(--ease);
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after { width: 100%; }
.nav-links a[aria-current="page"] { color: var(--color-ink); font-weight: var(--fw-semibold); }

.nav-actions {
  display: flex;
  gap: var(--sp-3);
  align-items: center;
}

/* === 按钮 === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  border: 0;
  border-radius: var(--radius);
  padding: 11px 18px;
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-base) var(--ease), background var(--duration-base) var(--ease);
  white-space: nowrap;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: var(--gradient-cta);
  color: white;
  box-shadow: var(--shadow-glow);
}
.btn-primary:hover { color: white; box-shadow: var(--shadow-cyan-glow); }
.btn-secondary {
  background: white;
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { color: var(--color-purple); border-color: var(--color-purple); }
.btn-navy {
  background: var(--color-navy);
  color: white;
}
.btn-navy:hover { color: white; background: var(--color-navy-2); }
.btn-ghost {
  background: transparent;
  color: var(--color-muted);
  padding: 8px 12px;
}
.btn-ghost:hover { color: var(--color-ink); background: var(--color-bg-2); }

/* === 通用排版 === */
.eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-purple);
  margin-bottom: var(--sp-3);
}
.eyebrow.cyan { color: var(--color-cyan); }
.eyebrow.light { color: rgba(255, 255, 255, 0.8); }

.section {
  padding: var(--sp-9) 0;
}
.section-tight { padding: var(--sp-8) 0; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--sp-7);
  margin-bottom: var(--sp-7);
}
.section-head h2 {
  font-size: var(--fs-3xl);
  margin: 0 0 var(--sp-3);
  letter-spacing: -0.5px;
}
.section-head p {
  color: var(--color-muted);
  max-width: 640px;
  font-size: var(--fs-md);
}
.section-head .btn { flex-shrink: 0; }

@media (max-width: 768px) {
  .section-head {
    flex-direction: column;
    align-items: stretch;
  }
  .section-head h2 { font-size: var(--fs-2xl); }
  .section { padding: var(--sp-8) 0; }
}

/* === 卡片 === */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow-sm);
  transition: transform var(--duration-base) var(--ease), box-shadow var(--duration-base) var(--ease), border-color var(--duration-base) var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}
.card h3 {
  font-size: var(--fs-md);
  margin: 0 0 var(--sp-2);
}
.card p {
  color: var(--color-muted);
  font-size: var(--fs-sm);
  line-height: var(--lh-base);
}

/* === 标签 === */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  background: var(--color-bg-2);
  color: var(--color-muted);
}
.tag-purple { background: #F0E8FF; color: var(--color-purple); }
.tag-cyan { background: #E0F7FF; color: #008CB3; }
.tag-navy { background: #E2E8F5; color: var(--color-navy); }
.tag-green { background: #D1FAE5; color: #047857; }
.tag-gold { background: #FEF3C7; color: #92400E; }

/* === Hero 通用 === */
.hero {
  position: relative;
  background: var(--gradient-hero);
  color: white;
  overflow: hidden;
  padding: var(--sp-9) 0 var(--sp-8);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.1));
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.1));
  pointer-events: none;
}
.hero > * { position: relative; }
.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  line-height: 1.05;
  color: white;
  margin: var(--sp-3) 0 var(--sp-4);
  letter-spacing: -0.5px;
  max-width: 820px;
}
.hero .lead {
  font-size: var(--fs-md);
  color: rgba(255, 255, 255, 0.85);
  max-width: 700px;
  line-height: 1.7;
}
.hero .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}
.hero .btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: white;
  border-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
}
.hero .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
  color: white;
  border-color: rgba(255, 255, 255, 0.4);
}

/* === 数据指标 === */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-7);
}
.metric {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: var(--sp-4) var(--sp-5);
  backdrop-filter: blur(8px);
}
.metric strong {
  display: block;
  font-size: var(--fs-2xl);
  font-weight: var(--fw-black);
  color: white;
  line-height: 1.1;
  margin-bottom: 4px;
}
.metric span {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.75);
}
@media (max-width: 768px) {
  .metrics { grid-template-columns: repeat(2, 1fr); }
}

/* === 移动端汉堡菜单 === */
.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  color: var(--color-ink);
  align-items: center;
  justify-content: center;
}
.nav-toggle:hover { background: var(--color-bg-2); }

@media (max-width: 960px) {
  .nav-links {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    flex-direction: column;
    background: white;
    padding: var(--sp-5) var(--container-pad);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    gap: 0;
    transform: translateY(-110%);
    transition: transform var(--duration-base) var(--ease);
    align-items: stretch;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links li { width: 100%; }
  .nav-links a {
    display: block;
    padding: var(--sp-4) 0;
    font-size: var(--fs-md);
    border-bottom: 1px solid var(--color-border);
  }
  .nav-links a::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-actions .btn-ghost { display: none; }
}
@media (max-width: 480px) {
  .nav-actions .btn { padding: 9px 14px; font-size: 12px; }
  .brand-text small { display: none; }
}

/* === 面包屑 === */
.breadcrumb {
  font-size: var(--fs-sm);
  color: var(--color-muted);
  padding: var(--sp-4) 0;
}
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-purple); }
.breadcrumb-sep { margin: 0 8px; color: var(--color-light); }

/* === 页脚 === */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--sp-8) 0 var(--sp-5);
  margin-top: var(--sp-9);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: var(--sp-7);
  margin-bottom: var(--sp-7);
  align-items: start;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
  color: white;
  font-weight: var(--fw-bold);
}
.footer-brand .brand-mark { box-shadow: 0 8px 24px rgba(122, 44, 255, 0.3); }
.footer-contact {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.7);
}
.footer-contact a { color: rgba(255, 255, 255, 0.9); text-decoration: none; border-bottom: 1px solid rgba(122, 44, 255, 0.5); }
.footer-contact a:hover { color: var(--color-cyan); border-color: var(--color-cyan); }
.footer-tagline { font-size: var(--fs-sm); line-height: 1.7; max-width: 320px; }
.footer-col h4 {
  color: white;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  margin: 0 0 var(--sp-3);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-col ul li { margin-bottom: 8px; font-size: var(--fs-sm); }
.footer-col a { color: rgba(255, 255, 255, 0.7); }
.footer-col a:hover { color: var(--color-cyan); }

/* === 关注公众号二维码 === */
.footer-qr {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.footer-qr-wrap {
  width: 120px;
  height: 120px;
  border-radius: var(--radius);
  overflow: hidden;
  background: white;
  padding: 6px;
  box-shadow: 0 6px 20px rgba(122, 44, 255, 0.25);
  margin-bottom: 12px;
}
.footer-qr-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.footer-qr-label {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.55;
  margin: 0;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.3px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--sp-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; gap: var(--sp-5); }
  .footer-qr { grid-column: 1 / -1; align-items: center; }
  .footer-qr-wrap { margin: 0 auto 12px; }
}
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--sp-5); }
  .footer-qr { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* === 工具：可见性 === */
.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;
}

/* === 焦点态 === */
:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 2px;
  border-radius: 4px;
}
.btn:focus-visible {
  outline-offset: 3px;
}
/* === Page Hero（次级） === */
.page-hero {
  background: var(--gradient-hero);
  color: white;
  padding: var(--sp-8) 0 var(--sp-7);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.1));
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.1));
  pointer-events: none;
}
.page-hero > * { position: relative; }
.page-hero .eyebrow { color: var(--color-cyan); }
.page-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: white;
  margin: var(--sp-3) 0 var(--sp-3);
  max-width: 720px;
  letter-spacing: -0.5px;
}
.page-hero p {
  font-size: var(--fs-md);
  color: rgba(255, 255, 255, 0.85);
  max-width: 700px;
  line-height: 1.7;
}
.page-hero .metrics {
  margin-top: var(--sp-6);
  max-width: 720px;
}


/* footer 品牌 logo（替代或补充 brand-mark） */
.footer-brand .brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 9px;
  object-fit: contain;
  background: white;
  padding: 3px;
  box-shadow: 0 8px 24px rgba(122, 44, 255, 0.3);
}