/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fff;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Colors ===== */
:root {
  --primary: #4CAF50;
  --primary-dark: #388E3C;
  --primary-light: #C8E6C9;
  --accent: #66BB6A;
  --text: #333;
  --text-light: #666;
  --bg: #fff;
  --bg-gray: #F5F7FA;
  --border: #E8E8E8;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.nav-content { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; }
.logo-icon { color: var(--primary); font-size: 24px; }
.logo-text { color: var(--text); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { color: var(--text-light); font-size: 15px; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); margin: 5px 0; transition: 0.3s; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px; font-size: 15px; font-weight: 600;
  transition: all 0.2s; cursor: pointer; border: 2px solid transparent;
}
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(76,175,80,0.3); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn.disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

/* ===== Hero ===== */
.hero { padding: 120px 0 80px; background: linear-gradient(135deg, #f0fdf0 0%, #fff 50%, #f0f9ff 100%); }
.hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero h1 { font-size: 48px; line-height: 1.2; margin-bottom: 20px; }
.highlight { color: var(--primary); }
.hero-desc { font-size: 18px; color: var(--text-light); margin-bottom: 32px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; margin-bottom: 24px; }
.hero-badges { display: flex; gap: 12px; }
.badge { display: inline-block; padding: 4px 14px; background: var(--bg-gray); border-radius: 20px; font-size: 13px; color: var(--text-light); }

/* Phone Mockup */
.phone-mockup {
  width: 280px; margin: 0 auto;
  background: #1a1a2e; border-radius: 32px; padding: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
.phone-screen { background: #f5f5f5; border-radius: 22px; padding: 20px 16px; min-height: 400px; }
.mock-header { display: flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 700; margin-bottom: 20px; color: var(--text); }
.mock-icon { color: var(--primary); }
.mock-card { background: #fff; border-radius: 12px; padding: 16px; margin-bottom: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.mock-label { font-size: 12px; color: var(--text-light); margin-bottom: 4px; }
.mock-value { font-size: 24px; font-weight: 700; color: var(--text); }
.mock-value small { font-size: 14px; color: var(--text-light); font-weight: 400; }
.mock-sub { font-size: 12px; color: var(--primary); margin-top: 4px; }

/* ===== Sections Common ===== */
.section-title { font-size: 36px; text-align: center; margin-bottom: 12px; }
.section-desc { text-align: center; color: var(--text-light); font-size: 16px; margin-bottom: 48px; }

/* ===== Features ===== */
.features { padding: 100px 0; background: var(--bg-gray); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
  background: #fff; border-radius: 16px; padding: 32px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.feature-icon { font-size: 36px; margin-bottom: 16px; }
.feature-card h3 { font-size: 18px; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* ===== Screenshots ===== */
.screenshots { padding: 100px 0; }
.screenshot-tabs { display: flex; justify-content: center; gap: 16px; margin-bottom: 40px; }
.tab-btn {
  padding: 10px 24px; border: 2px solid var(--border); border-radius: 24px;
  background: transparent; font-size: 14px; cursor: pointer; transition: all 0.2s;
}
.tab-btn.active, .tab-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.screenshot-panel { display: none; gap: 60px; align-items: center; }
.screenshot-panel.active { display: grid; grid-template-columns: 1fr 1fr; }
.screenshot-mockup { background: var(--bg-gray); border-radius: 16px; padding: 24px; }
.mock-list { display: flex; flex-direction: column; gap: 8px; }
.mock-item {
  display: flex; justify-content: space-between; align-items: center;
  background: #fff; padding: 14px 16px; border-radius: 10px; font-size: 14px;
}
.mock-item .green { color: var(--primary); font-weight: 600; }
.mock-item .orange { color: #FF9800; font-weight: 600; }
.profile-item { padding: 16px; }
.screenshot-info h3 { font-size: 24px; margin-bottom: 16px; }
.screenshot-info ul { display: flex; flex-direction: column; gap: 12px; }
.screenshot-info li { padding-left: 24px; position: relative; color: var(--text-light); }
.screenshot-info li::before { content: ''; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; }

/* ===== Tech ===== */
.tech { padding: 100px 0; background: var(--bg-gray); }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.tech-card {
  background: #fff; border-radius: 16px; padding: 32px; text-align: center;
  transition: transform 0.2s;
}
.tech-card:hover { transform: translateY(-4px); }
.tech-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: var(--primary-light); color: var(--primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700; margin: 0 auto 16px;
}
.tech-card h3 { font-size: 16px; margin-bottom: 8px; }
.tech-card p { font-size: 13px; color: var(--text-light); }

/* ===== Download ===== */
.download { padding: 100px 0; background: linear-gradient(135deg, #e8f5e9 0%, #f1f8e9 100%); }
.download-content { text-align: center; }
.download-buttons { display: flex; justify-content: center; gap: 20px; }
.btn-icon { font-size: 20px; }

/* ===== Footer ===== */
.footer { background: #1a1a2e; color: #ccc; padding-top: 60px; }
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.1); }
.footer-brand .logo-icon { color: var(--accent); }
.footer-brand .logo-text { color: #fff; font-size: 20px; font-weight: 700; }
.footer-brand p { margin-top: 12px; font-size: 14px; }
.footer-links h4 { color: #fff; margin-bottom: 16px; font-size: 15px; }
.footer-links a { display: block; margin-bottom: 10px; font-size: 14px; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { padding: 20px 0; text-align: center; font-size: 13px; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 20px; gap: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  }
  .nav-links.open { display: flex; }
  .hero-content { grid-template-columns: 1fr; text-align: center; gap: 40px; }
  .hero h1 { font-size: 32px; }
  .hero-buttons { justify-content: center; }
  .hero-badges { justify-content: center; }
  .feature-grid { grid-template-columns: 1fr; }
  .screenshot-panel.active { grid-template-columns: 1fr; }
  .screenshot-tabs { flex-wrap: wrap; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .download-buttons { flex-direction: column; align-items: center; }
  .footer-content { grid-template-columns: 1fr; }
}