/*
Theme Name: Sogou Browser Landing
Theme URI: https://sogou-browser.com.cn/
Description: 静态落地页主题，目录结构参考 WordPress 主题规范。
Version: 1.0.0
Author: Site Owner
Text Domain: sogou-browser
*/

:root {
  --bg: #0f1419;
  --surface: #1a222c;
  --surface-2: #232d3a;
  --text: #e8eef4;
  --muted: #9aa8b6;
  --accent: #ff6b35;
  --accent-dim: #e85a2a;
  --link: #6eb3ff;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --max: 72rem;
  --header-h: 3.75rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: #9cc8ff;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #111;
  font-weight: 600;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 20, 25, 0.92);
  backdrop-filter: blur(10px);
}

.header-inner {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-title a {
  color: var(--text);
  text-decoration: none;
}

.site-title a:hover {
  color: var(--accent);
}

.main-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  align-items: center;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--text);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .main-nav.is-open {
    max-height: 16rem;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem 1.25rem 1rem;
    gap: 0;
  }

  .main-nav a {
    display: block;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
  }

  .main-nav li:last-child a {
    border-bottom: 0;
  }
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3.5rem;
}

.hero {
  padding: 2.5rem 0 2rem;
  text-align: center;
}

@media (min-width: 768px) {
  .hero {
    padding: 3.5rem 0 2.5rem;
  }
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.hero .lead {
  margin: 0 auto 1.75rem;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.0625rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0 1.35rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease;
}

.btn:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

.btn-primary {
  background: linear-gradient(165deg, var(--accent), var(--accent-dim));
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 107, 53, 0.35);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  color: var(--text);
  background: #2c3848;
}

.grid-2 {
  display: grid;
  gap: 1.25rem;
  margin-top: 2.5rem;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem 1.25rem;
}

.card h2,
.card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.125rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

.section-title {
  margin: 2.75rem 0 1rem;
  font-size: 1.35rem;
  font-weight: 700;
}

.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.65rem;
  padding: 0.85rem 1rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details[open] summary {
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.faq .answer {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 1.25rem;
  margin-top: 2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

.site-footer p {
  margin: 0.35rem 0;
}

.breadcrumbs {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.breadcrumbs a {
  color: var(--muted);
}

.breadcrumbs a:hover {
  color: var(--link);
}

.download-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 0;
  font-size: 0.9375rem;
}

.download-table th,
.download-table td {
  border: 1px solid var(--border);
  padding: 0.75rem 0.85rem;
  text-align: left;
}

.download-table th {
  background: var(--surface-2);
  font-weight: 600;
}

.download-table td {
  color: var(--muted);
}

.note-box {
  margin-top: 1.5rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(110, 179, 255, 0.06);
  font-size: 0.9rem;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}