/* ========== 公共容器 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 导航栏 ========== */
.main-nav {
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 22px;
    font-weight: bold;
    color: #1a73e8;
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-links a {
    color: #555;
    text-decoration: none;
    font-size: 15px;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s;
    position: relative;
}

.nav-links a:hover {
    color: #1a73e8;
    background: #f0f7ff;
}

/* 当前页面高亮 + 下划线 */
.nav-links a.active {
    color: #1a73e8;
    font-weight: 500;
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 16px;
    right: 16px;
    height: 2px;
    background: #1a73e8;
    border-radius: 1px;
}

/* 手机端汉堡菜单按钮 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #333;
    padding: 4px 8px;
}

/* ========== 手机端响应式 ========== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        padding: 12px 0;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        padding: 12px 20px;
        border-radius: 0;
        width: 100%;
    }

    .nav-links a.active::after {
        left: 20px;
        right: auto;
        width: 24px;
        bottom: 8px;
    }
}



/* ========== 页脚 ========== */
.site-footer {
    background: #1a1a2e;
    color: #ccc;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding: 60px 20px 40px;
}

.footer-section h3 {
    color: #fff;
    font-size: 20px;
    margin-bottom: 12px;
}

.footer-section h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-section a {
    display: block;
    color: #aaa;
    text-decoration: none;
    margin-bottom: 10px;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: #fff;
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 6px;
}

.footer-brand p {
    line-height: 1.8;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding: 20px 0;
}

.footer-bottom .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer-bottom p {
    font-size: 14px;
    color: #888;
}

.footer-bottom-links {
    font-size: 14px;
}

.footer-bottom-links a {
    color: #888;
    text-decoration: none;
}

.footer-bottom-links a:hover {
    color: #fff;
}

.footer-bottom-links span {
    margin: 0 8px;
    color: #555;
}

/* ========== 公共容器 ========== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-links { display: none; }  /* 手机端隐藏，后续可加汉堡菜单 */

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 40px 20px 20px;
    }

    .footer-bottom .container {
        flex-direction: column;
        gap: 10px;
    }
}



/* ===== CSS Variables ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --primary-50: #eff6ff;
  --secondary: #0ea5e9;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  --bg: #ffffff;
  --bg-light: #f8fafc;
  --bg-gray: #f1f5f9;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  --max-w: 1200px;
  --transition: 0.25s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; transition: all var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
ul, ol { list-style: none; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
}
.logo { font-size: 24px; font-weight: 800; color: var(--primary); display: flex; align-items: center; gap: 10px; letter-spacing: -0.5px; }
.logo svg { width: 32px; height: 32px; }
.logo span { color: var(--text); }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { color: var(--text-secondary); font-size: 15px; font-weight: 500; position: relative; transition: color var(--transition); }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -6px; left: 0; right: 0; height: 2.5px; background: var(--primary); border-radius: 2px; }
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff !important; padding: 10px 24px; border-radius: 8px;
  font-size: 14px; font-weight: 600;
  box-shadow: 0 2px 8px rgba(37,99,235,0.3);
  transition: all var(--transition);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(37,99,235,0.4); color: #fff !important; }
.mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); }

/* ===== Hero ===== */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(165deg, #eff6ff 0%, #dbeafe 40%, #e0f2fe 70%, #f0f9ff 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; top: -50%; right: -20%; width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute; bottom: -30%; left: -10%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,0.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: 48px; font-weight: 900; line-height: 1.2; margin-bottom: 20px; color: var(--text); letter-spacing: -1px; }
.hero h1 em { font-style: normal; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero .subtitle { font-size: 20px; color: var(--text-secondary); max-width: 600px; margin-bottom: 12px; font-weight: 400; }
.hero .tagline { font-size: 16px; color: var(--text-light); margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 10px; font-size: 16px; font-weight: 600; cursor: pointer; border: none; transition: all var(--transition); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 14px rgba(37,99,235,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,0.45); color: #fff; }
.btn-outline { background: #fff; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary-50); border-color: var(--primary-dark); }

/* Stats Bar */
.stats-bar {
  display: flex; gap: 0; background: #fff; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); overflow: hidden; max-width: 800px;
}
.stat-item {
  flex: 1; text-align: center; padding: 24px 16px;
  border-right: 1px solid var(--border);
  transition: background var(--transition);
}
.stat-item:last-child { border-right: none; }
.stat-item:hover { background: var(--primary-50); }
.stat-num { font-size: 28px; font-weight: 800; color: var(--primary); line-height: 1.2; }
.stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-light); }
.section-title { font-size: 32px; font-weight: 800; text-align: center; margin-bottom: 12px; letter-spacing: -0.5px; }
.section-title em { font-style: normal; color: var(--primary); }
.section-desc { text-align: center; color: var(--text-secondary); font-size: 17px; max-width: 640px; margin: 0 auto 48px; line-height: 1.7; }

/* ===== Feature Cards ===== */
.feature-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.feature-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px 24px; transition: all var(--transition); position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0; transition: opacity var(--transition);
}
.feature-card:hover {
  box-shadow: var(--shadow-xl); transform: translateY(-4px); border-color: var(--primary-light);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px; height: 52px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-light), #e0f2fe);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 26px; height: 26px; color: var(--primary); }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }
.feature-link {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 14px; font-weight: 600; color: var(--primary);
}
.feature-link:hover { gap: 8px; color: var(--primary-dark); }
.feature-link svg { width: 16px; height: 16px; transition: transform var(--transition); }
.feature-card:hover .feature-link svg { transform: translateX(2px); }

/* ===== Solution Cards ===== */
.solution-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.solution-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 28px; transition: all var(--transition);
  display: flex; flex-direction: column;
}
.solution-card:hover {
  box-shadow: var(--shadow-xl); transform: translateY(-4px); border-color: var(--primary-light);
}
.solution-icon {
  width: 56px; height: 56px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 28px;
}
.solution-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.solution-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; flex: 1; }
.solution-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 15px; font-weight: 600; color: var(--primary);
}
.solution-link:hover { gap: 10px; color: var(--primary-dark); }

/* ===== Why Section ===== */
.why-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
}
.why-item { text-align: center; padding: 24px; }
.why-icon {
  width: 72px; height: 72px; border-radius: 20px; margin: 0 auto 20px;
  display: flex; align-items: center; justify-content: center; font-size: 32px;
  background: linear-gradient(135deg, var(--primary-50), #e0f2fe);
}
.why-item h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.why-item p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; }

/* ===== CTA Section ===== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #2563eb 100%);
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute; top: -40%; right: -10%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(14,165,233,0.2) 0%, transparent 70%);
  border-radius: 50%;
}
.cta-section .container { position: relative; z-index: 1; text-align: center; }
.cta-section h2 { font-size: 36px; font-weight: 800; color: #fff; margin-bottom: 16px; }
.cta-section p { font-size: 18px; color: rgba(255,255,255,0.85); margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-section .btn {
  background: #fff; color: var(--primary); padding: 16px 40px;
  font-size: 18px; border-radius: 12px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.2);
}
.cta-section .btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.3); }

/* ===== Footer ===== */
.site-footer { background: #0f172a; color: #94a3b8; padding: 60px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 40px; }
.footer-col h4 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; }
.footer-col p { font-size: 14px; line-height: 1.8; }
.footer-col a { display: block; color: #94a3b8; font-size: 14px; padding: 5px 0; transition: color var(--transition); }
.footer-col a:hover { color: #fff; padding-left: 4px; }
.footer-bottom { border-top: 1px solid #1e293b; padding-top: 24px; text-align: center; font-size: 13px; color: #64748b; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg); gap: 16px; }
  .nav-links.show { display: flex; }
  .mobile-toggle { display: block; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 32px; }
  .hero .subtitle { font-size: 17px; }
  .stats-bar { flex-wrap: wrap; }
  .stat-item { flex: 1 1 50%; border-bottom: 1px solid var(--border); }
  .section-title { font-size: 26px; }
  .feature-grid, .solution-grid, .why-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-section h2 { font-size: 28px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 26px; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .stats-bar { flex-direction: column; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border); }
  .footer-grid { grid-template-columns: 1fr; }
}
  
.feature-hero { padding: 60px 0 50px; background: linear-gradient(165deg, #eff6ff 0%, #dbeafe 40%, #e0f2fe 70%, #f0f9ff 100%); position: relative; overflow: hidden; }
.feature-hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%); border-radius: 50%; }
.feature-hero .container { position: relative; z-index: 1; }
.feature-hero h1 { font-size: 40px; font-weight: 900; margin-bottom: 16px; letter-spacing: -0.5px; }
.feature-hero h1 em { font-style: normal; background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.feature-hero p { font-size: 18px; color: var(--text-secondary); max-width: 650px; margin-bottom: 24px; }
.breadcrumb { padding: 16px 0; font-size: 14px; color: var(--text-light); }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }
.cta-banner { background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #2563eb 100%); color: #fff; text-align: center; padding: 56px 32px; border-radius: var(--radius-lg); margin: 40px 0; position: relative; overflow: hidden; }
.cta-banner::before { content: ''; position: absolute; top: -40%; right: -10%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(14,165,233,0.2) 0%, transparent 70%); border-radius: 50%; }
.cta-banner h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; position: relative; z-index: 1; }
.cta-banner p { opacity: 0.9; margin-bottom: 24px; font-size: 17px; position: relative; z-index: 1; }
.cta-banner .btn { background: #fff; color: var(--primary); position: relative; z-index: 1; }
.cta-banner .btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }