/* style.css - 开云新版App下载 (KAIYUN) */
/* ===== 基础重置与变量 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --text: #1a1f36;
  --text-muted: #5a6178;
  --accent: #f0b429;
  --accent2: #e89b1e;
  --glass: rgba(255,255,255,0.6);
  --shadow: 0 8px 32px rgba(0,0,0,0.06);
  --radius: 20px;
  --radius-sm: 12px;
  --nav-bg: rgba(255,255,255,0.85);
  --border: #e9ecf2;
  --gradient1: linear-gradient(135deg, #0b0e1a 0%, #1a1f36 100%);
  --gradient2: linear-gradient(135deg, #f0b429 0%, #d48c1c 100%);
  --section-pad: 80px 0;
  --container: 1200px;
}
.dark-mode {
  --bg: #0b0e1a;
  --bg-card: #161b2e;
  --text: #eef0f7;
  --text-muted: #8f96b0;
  --glass: rgba(22,27,46,0.7);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --nav-bg: rgba(11,14,26,0.9);
  --border: #2a2f45;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.4s, color 0.4s;
}
a { color: var(--accent); text-decoration: none; }
img, svg { display: block; max-width: 100%; height: auto; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
section, article { padding: var(--section-pad); }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2.4rem, 6vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin-bottom: 24px; }
h3 { font-size: 1.4rem; margin-bottom: 12px; }
p { margin-bottom: 16px; color: var(--text-muted); font-size: 1rem; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 50px;
  font-weight: 600; font-size: 1rem; border: none; cursor: pointer; transition: all 0.3s;
  background: var(--gradient2); color: #0b0e1a;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(240,180,41,0.3); }
.btn-outline { background: transparent; border: 2px solid var(--accent); color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #0b0e1a; }
.badge {
  display: inline-block; background: var(--accent); color: #0b0e1a; padding: 4px 14px;
  border-radius: 50px; font-size: 0.8rem; font-weight: 600; margin-bottom: 12px;
}
.grid-2, .grid-3, .grid-4 { display: grid; gap: 28px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.card {
  background: var(--bg-card); border-radius: var(--radius); padding: 32px 24px;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: transform 0.3s, box-shadow 0.3s; backdrop-filter: blur(8px);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 16px 48px rgba(0,0,0,0.08); }
.glass { background: var(--glass); backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius); }
.text-center { text-align: center; }
.mt-2 { margin-top: 20px; }
.mb-2 { margin-bottom: 20px; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.section-tag {
  display: inline-block; background: var(--accent); color: #0b0e1a; padding: 4px 16px;
  border-radius: 50px; font-size: 0.8rem; font-weight: 600; letter-spacing: 1px; margin-bottom: 16px; text-transform: uppercase;
}
/* ===== 导航栏 ===== */
.nav-bar {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: var(--nav-bg); backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border); transition: background 0.4s;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 24px; max-width: var(--container); margin: 0 auto; }
.logo { font-size: 1.6rem; font-weight: 800; color: var(--accent); letter-spacing: -0.5px; display: flex; align-items: center; gap: 8px; }
.logo svg { width: 32px; height: 32px; }
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links a { color: var(--text); font-weight: 500; font-size: 0.95rem; padding: 6px 0; position: relative; transition: color 0.3s; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--accent); transition: width 0.3s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 16px; }
.dark-toggle, .menu-toggle, .search-toggle {
  background: none; border: none; color: var(--text); font-size: 1.3rem; cursor: pointer; padding: 4px;
  border-radius: 8px; transition: background 0.3s; display: flex; align-items: center; justify-content: center; width: 36px; height: 36px;
}
.dark-toggle:hover, .menu-toggle:hover, .search-toggle:hover { background: var(--border); }
.menu-toggle { display: none; }
/* ===== Hero ===== */
.hero {
  min-height: 85vh; display: flex; align-items: center; background: var(--gradient1);
  position: relative; overflow: hidden; padding: 120px 0 80px;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(240,180,41,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(240,180,41,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero-text h1 { color: #fff; margin-bottom: 20px; }
.hero-text p { color: rgba(255,255,255,0.7); font-size: 1.15rem; max-width: 520px; margin-bottom: 28px; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { display: flex; justify-content: center; align-items: center; }
.hero-svg { width: 100%; max-width: 480px; }
.banner-indicators { display: flex; gap: 8px; margin-top: 32px; }
.banner-dot { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.2); cursor: pointer; transition: background 0.3s, transform 0.3s; }
.banner-dot.active { background: var(--accent); transform: scale(1.3); }
/* ===== 深色区块 ===== */
.section-dark { background: var(--gradient1); color: #fff; }
.section-dark h2, .section-dark .section-tag { color: #fff; }
.section-dark p { color: rgba(255,255,255,0.7); }
/* ===== 统计 ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; padding: 24px; }
.stat-number { font-size: 2.8rem; font-weight: 800; color: var(--accent); line-height: 1; }
.stat-label { color: var(--text-muted); font-size: 0.95rem; margin-top: 8px; }
/* ===== FAQ ===== */
.faq-item { border-bottom: 1px solid var(--border); padding: 16px 0; }
.faq-question { display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 600; font-size: 1.05rem; }
.faq-question span { transition: transform 0.3s; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s; padding-top: 0; color: var(--text-muted); }
.faq-item.open .faq-answer { max-height: 300px; padding-top: 12px; }
.faq-item.open .faq-question span { transform: rotate(180deg); }
/* ===== HowTo ===== */
.howto-steps { counter-reset: step; }
.howto-step { display: flex; gap: 20px; align-items: flex-start; padding: 20px 0; border-bottom: 1px solid var(--border); }
.howto-step:last-child { border-bottom: none; }
.step-num { flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%; background: var(--accent); color: #0b0e1a; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 1.1rem; }
/* ===== Footer ===== */
.footer { background: var(--gradient1); color: rgba(255,255,255,0.8); padding: 60px 0 30px; }
.footer a { color: rgba(255,255,255,0.7); }
.footer a:hover { color: var(--accent); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 40px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); margin-top: 40px; padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; font-size: 0.85rem; }
/* ===== 面包屑 ===== */
.breadcrumb { display: flex; gap: 8px; font-size: 0.85rem; color: var(--text-muted); padding: 16px 0; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
/* ===== 搜索模态框 ===== */
.search-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); backdrop-filter: blur(8px); z-index: 2000; display: none; align-items: center; justify-content: center; }
.search-modal.open { display: flex; }
.search-box { background: var(--bg-card); padding: 32px; border-radius: var(--radius); width: 90%; max-width: 560px; }
.search-box input { width: 100%; padding: 14px 20px; border-radius: 50px; border: 2px solid var(--border); background: var(--bg); color: var(--text); font-size: 1rem; outline: none; }
.search-box input:focus { border-color: var(--accent); }
/* ===== 返回顶部 ===== */
.back-to-top { position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px; border-radius: 50%; background: var(--accent); color: #0b0e1a; border: none; font-size: 1.4rem; cursor: pointer; box-shadow: 0 4px 16px rgba(240,180,41,0.3); display: none; align-items: center; justify-content: center; z-index: 999; transition: all 0.3s; }
.back-to-top.show { display: flex; }
.back-to-top:hover { transform: translateY(-4px); }
/* ===== 评价卡片 ===== */
.testimonial-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); }
.testimonial-text { font-style: italic; margin-bottom: 16px; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--accent); display: flex; align-items: center; justify-content: center; font-weight: 700; color: #0b0e1a; }
/* ===== 合作伙伴 ===== */
.partner-logo { display: flex; align-items: center; justify-content: center; padding: 16px; opacity: 0.7; transition: opacity 0.3s; }
.partner-logo:hover { opacity: 1; }
/* ===== 新闻卡片 ===== */
.news-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); transition: transform 0.3s; }
.news-card:hover { transform: translateY(-4px); }
.news-card-body { padding: 20px; }
.news-date { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
/* ===== 移动菜单 ===== */
.mobile-menu { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg); z-index: 999; display: none; flex-direction: column; align-items: center; justify-content: center; gap: 24px; }
.mobile-menu.open { display: flex; }
.mobile-menu a { font-size: 1.4rem; font-weight: 600; color: var(--text); }
.mobile-menu a:hover { color: var(--accent); }
.mobile-menu-close { position: absolute; top: 20px; right: 20px; background: none; border: none; font-size: 2rem; color: var(--text); cursor: pointer; }
/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .menu-toggle { display: flex; }
  .hero-content { grid-template-columns: 1fr; text-align: center; }
  .hero-text p { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}
/* ===== 滚动动画 ===== */
[data-aos] { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-aos].aos-animate { opacity: 1; transform: translateY(0); }