/* ===== CSS变量 ===== */
:root {
  --primary: #2563EB;
  --primary-light: #3B82F6;
  --accent: #22D3EE;
  --purple: #7C3AED;
  --bg: #0F172A;
  --bg-card: #1E293B;
  --bg-elevated: #334155;
  --text: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-dim: #64748B;
  --border: #334155;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --transition: all 0.3s ease;
}

[data-theme="light"] {
  --bg: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-elevated: #F1F5F9;
  --text: #0F172A;
  --text-secondary: #475569;
  --text-dim: #94A3B8;
  --border: #E2E8F0;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

/* ===== 基础样式 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 16px 0;
  background: transparent;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  padding: 10px 0;
}
[data-theme="light"] .navbar.scrolled {
  background: rgba(248, 250, 252, 0.85);
  border-bottom-color: rgba(226, 232, 240, 0.8);
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.25rem; font-weight: 700; color: var(--text);
}
.nav-logo:hover { color: var(--text); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { color: var(--text-secondary); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle {
  background: none; border: none; cursor: pointer; color: var(--text-secondary);
  padding: 6px; border-radius: 8px; display: flex;
}
.theme-toggle:hover { color: var(--text); background: var(--bg-elevated); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }
.nav-github { color: var(--text-secondary); display: flex; }
.nav-github:hover { color: var(--text); }
.mobile-menu { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.mobile-menu span {
  display: block; width: 20px; height: 2px;
  background: var(--text-secondary); margin: 4px 0; transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
}
.hero-content {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
  position: relative; z-index: 1;
}
.hero h1 { font-size: 3.2rem; font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--purple) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 32px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 28px; border-radius: 10px; font-size: 0.95rem; font-weight: 600;
  transition: var(--transition); cursor: pointer; border: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--purple));
  color: #fff;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(37, 99, 235, 0.4); color: #fff; }
.btn-glow { box-shadow: 0 0 20px rgba(37, 99, 235, 0.3); }
.btn-outline {
  background: transparent; border: 1.5px solid var(--border); color: var(--text);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ===== 终端窗口 ===== */
.term-window, .showcase-window {
  background: #1a1b2e; border-radius: 12px; overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.05);
}
.term-header {
  background: #2a2b3e; padding: 10px 16px;
  display: flex; align-items: center; gap: 12px;
}
.term-dots { display: flex; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.red { background: #FF5F57; }
.dot.yellow { background: #FEBC2E; }
.dot.green { background: #28C840; }
.term-title { color: #888; font-size: 0.8rem; font-family: var(--font-mono); }
.term-body { padding: 20px; font-family: var(--font-mono); font-size: 0.85rem; color: #E2E8F0; min-height: 200px; }
.term-line { line-height: 1.8; }
.term-prompt { color: #50FA7B; }
.cursor { animation: blink 1s infinite; color: var(--accent); }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

/* ===== 功能区 ===== */
.features, .showcase, .tech, .download { padding: 100px 0; }
.section-title {
  font-size: 2.2rem; font-weight: 800; text-align: center; margin-bottom: 12px;
}
.section-desc { text-align: center; color: var(--text-secondary); margin-bottom: 48px; font-size: 1.05rem; }
.feature-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: 0; transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--primary); }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 48px; height: 48px; border-radius: 10px;
  background: rgba(37, 99, 235, 0.1); display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; color: var(--primary-light);
}
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== 产品展示 ===== */
.showcase-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 32px; }
.tab-btn {
  padding: 8px 20px; border: 1px solid var(--border); border-radius: 8px;
  background: transparent; color: var(--text-secondary); cursor: pointer;
  font-size: 0.9rem; transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.showcase-body { min-height: 350px; }

/* 模拟终端界面 */
.mock-terminal { display: flex; min-height: 350px; }
.mock-sidebar {
  width: 200px; background: #16213E; padding: 16px; border-right: 1px solid #2a2b3e;
}
.mock-sidebar-title { font-size: 0.75rem; color: #64748B; text-transform: uppercase; margin-bottom: 12px; font-weight: 600; }
.mock-host {
  padding: 8px 10px; border-radius: 6px; font-size: 0.8rem; color: #94A3B8;
  cursor: pointer; display: flex; align-items: center; gap: 8px; margin-bottom: 4px;
}
.mock-host.active { background: rgba(37, 99, 235, 0.15); color: #E2E8F0; }
.mock-dot { width: 6px; height: 6px; border-radius: 50%; background: #475569; }
.mock-dot.online { background: #22C55E; }
.mock-main { flex: 1; display: flex; flex-direction: column; }
.mock-tabs { display: flex; background: #1E293B; border-bottom: 1px solid #2a2b3e; }
.mock-tab { padding: 8px 16px; font-size: 0.8rem; color: #94A3B8; border-bottom: 2px solid transparent; }
.mock-tab.active { color: #E2E8F0; border-bottom-color: var(--primary); }
.mock-term-content {
  flex: 1; padding: 16px; font-family: var(--font-mono); font-size: 0.8rem; color: #E2E8F0;
}
.mock-term-content p { line-height: 1.8; }
.mock-term-content .g { color: #50FA7B; }
.mock-term-content .b { color: #6272A4; }
.mock-term-content .dim { color: #64748B; }
.cursor-blink { animation: blink 1s infinite; }

/* ===== 技术架构 ===== */
.tech { background: var(--bg-card); }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.tech-card {
  text-align: center; padding: 40px 24px; border-radius: var(--radius);
  background: var(--bg); border: 1px solid var(--border); transition: var(--transition);
}
.tech-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.tech-label {
  font-size: 0.7rem; text-transform: uppercase; color: var(--accent);
  font-weight: 700; letter-spacing: 2px; margin-bottom: 8px;
}
.tech-name { font-size: 1.3rem; font-weight: 800; margin-bottom: 12px; }
.tech-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== 下载 ===== */
.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 24px; }
.download-card {
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  padding: 32px 20px; border-radius: var(--radius);
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text); transition: var(--transition);
}
.download-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow); color: var(--text); }
.download-card svg { color: var(--text-secondary); }
.dl-platform { font-size: 1.1rem; font-weight: 700; }
.dl-info { font-size: 0.8rem; color: var(--text-dim); }
.dl-btn {
  padding: 8px 20px; border-radius: 8px; font-size: 0.85rem; font-weight: 600;
  background: linear-gradient(135deg, var(--primary), var(--purple)); color: #fff;
}
.version-info { text-align: center; color: var(--text-dim); font-size: 0.85rem; }

/* ===== 页脚 ===== */
.footer { padding: 60px 0 0; border-top: 1px solid var(--border); }
.footer-content { display: flex; justify-content: space-between; gap: 40px; }
.footer-brand p { color: var(--text-dim); font-size: 0.9rem; margin-top: 8px; }
.footer-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.1rem; }
.footer-links { display: flex; gap: 60px; }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.footer-col a { display: block; color: var(--text-dim); font-size: 0.85rem; margin-bottom: 8px; }
.footer-col a:hover { color: var(--primary-light); }
.footer-bottom {
  margin-top: 40px; padding: 20px 0; border-top: 1px solid var(--border);
  text-align: center; color: var(--text-dim); font-size: 0.8rem;
}
.footer-bottom p { margin: 4px 0; }
.footer-bottom a { color: var(--text-dim); }
.footer-bottom a:hover { color: var(--primary-light); }