/* MetaMask 官网 - 共享样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --cream: #fff1eb;
  --purple: #3d065f;
  --purple-light: #5a1a8a;
  --black: #0a0a0a;
  --white: #ffffff;
  --green: #baf24a;
  --teal: #013330;
  --indigo: #190066;
  --orange: #ff6b35;
  --pink: #ff8fab;
  --gray: #6b6b6b;
  --gray-light: #f5f0ed;
  --radius-pill: 999px;
  --radius-card: 24px;
  --font-display: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --shadow: 0 4px 24px rgba(61, 6, 95, 0.08);
  --transition: 0.25s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--cream);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover { opacity: 0.75; }

a.btn-download:hover,
a.news-card:hover {
  opacity: 1;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 241, 235, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(61, 6, 95, 0.06);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--purple);
}

.logo img {
  width: 36px;
  height: 36px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--purple);
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(61, 6, 95, 0.08);
  opacity: 1;
}

.nav-links a.btn-download {
  background: var(--black);
  color: var(--white);
  margin-left: 8px;
}

.nav-links a.btn-download:hover {
  background: var(--black);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--black);
  color: var(--white);
  border: none;
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.btn-download:hover {
  opacity: 1;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--purple);
  border: 2px solid var(--purple);
}

.btn-outline:hover {
  background: var(--purple);
  color: var(--white);
}

/* 页脚 */
.site-footer {
  background: var(--purple);
  color: var(--white);
  padding: 64px 0 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  margin-top: 16px;
  opacity: 0.8;
  font-size: 0.9375rem;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  opacity: 0.7;
}

.footer-col ul {
  list-style: none;
}

.footer-col li { margin-bottom: 10px; }

.footer-col a {
  font-size: 0.9375rem;
  opacity: 0.9;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.875rem;
  opacity: 0.7;
}

/* 面包屑 */
.breadcrumb {
  padding: 24px 0 0;
  font-size: 0.875rem;
  color: var(--gray);
}

.breadcrumb a { color: var(--purple); }

.breadcrumb span { margin: 0 8px; }

/* 章节标题 */
.section-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--purple);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray);
  margin-top: 16px;
  max-width: 600px;
}

/* 新闻卡片 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.news-card {
  display: block;
  background: var(--white);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition);
  color: inherit;
}

.news-card:hover {
  transform: translateY(-4px);
}

.news-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--gray-light);
}

.news-card-body {
  padding: 24px;
}

.news-card-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(61, 6, 95, 0.08);
  color: var(--purple);
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.news-card h3 {
  font-size: 1.125rem;
  color: var(--purple);
  margin-bottom: 8px;
  line-height: 1.4;
}

.news-card time {
  font-size: 0.8125rem;
  color: var(--gray);
}

/* 页面通用 Hero */
.page-hero {
  padding: 60px 0 40px;
  text-align: center;
}

.page-hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  color: var(--purple);
  line-height: 1.05;
  margin-bottom: 16px;
}

/* CTA 横幅（全站共用） */
.cta-banner {
  margin: 40px 0 80px;
  padding: 64px 32px;
  background: var(--purple);
  border-radius: 32px;
  text-align: center;
  color: var(--white);
}

.cta-banner h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.cta-banner p {
  opacity: 0.85;
  margin-bottom: 32px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cta-banner .btn-download {
  background: var(--white);
  color: var(--purple);
}

/* 移动端菜单 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--purple);
  margin: 6px 0;
  transition: var(--transition);
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--cream);
    flex-direction: column;
    padding: 24px;
    gap: 4px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-bottom: 1px solid rgba(61, 6, 95, 0.1);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    padding: 14px 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}