/* ===== 全局变量 ===== */
:root {
    --primary: #f59e0b;
    --primary-dark: #d97706;
    --dark: #1f2937;
    --light: #f9fafb;
    --border: #e5e7eb;
    --text: #374151;
    --text-light: #6b7280;
    --max-width: 1200px;
    --radius: 8px;
}

/* ===== 基础重置 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.6; color: var(--text); background: var(--light); }
a { text-decoration: none; color: inherit; transition: all 0.2s; }
ul { list-style: none; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
section { padding: 60px 0; }

/* ===== 导航栏 ===== */
header { background: var(--dark); color: white; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo { font-size: 1.25rem; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo span { color: white; font-weight: 400; font-size: 0.9rem; margin-left: 8px; opacity: 0.8; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 0.95rem; opacity: 0.9; }
.nav-links a:hover { color: var(--primary); opacity: 1; }
.cta-btn { background: var(--primary); color: var(--dark) !important; padding: 8px 20px; border-radius: 4px; font-weight: 700; opacity: 1 !important; }
.cta-btn:hover { background: var(--primary-dark); }

/* 汉堡按钮 */
.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 8px; flex-direction: column; gap: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: white; border-radius: 2px; transition: all 0.3s ease; }
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 面包屑 ===== */
.breadcrumb { background: white; border-bottom: 1px solid var(--border); padding: 12px 0; font-size: 13px; color: var(--text-light); }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .separator { margin: 0 8px; color: var(--border); }
.breadcrumb .current { color: var(--text); font-weight: 600; }

/* ===== Hero ===== */
.hero { background: linear-gradient(135deg, var(--dark) 0%, #111827 100%); color: white; padding: 60px 0; text-align: center; }
.hero h1 { font-size: 2.2rem; margin-bottom: 16px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero p { font-size: 1.05rem; opacity: 0.85; max-width: 680px; margin: 0 auto; }

/* ===== 区块标题 ===== */
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 1.8rem; color: var(--dark); margin-bottom: 8px; }
.section-title p { color: var(--text-light); }

/* ===== 页脚 ===== */
footer { background: #111827; color: rgba(255,255,255,0.6); padding: 40px 0 30px; font-size: 0.85rem; }
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; text-align: center; }
.footer-inner a { color: rgba(255,255,255,0.8); margin: 0 12px; }
.footer-inner a:hover { color: var(--primary); }
.copyright { margin-top: 20px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 1.6rem; }
    section { padding: 40px 0; }
    .nav-links { display: none; position: absolute; top: 70px; left: 0; right: 0; background: var(--dark); flex-direction: column; padding: 20px; gap: 0; box-shadow: 0 10px 30px rgba(0,0,0,0.2); }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 15px 0; font-size: 1rem; border-bottom: 1px solid rgba(255,255,255,0.08); }
    .nav-links a:last-child { border-bottom: none; }
    .nav-links .cta-btn { margin-top: 10px; text-align: center; border-bottom: none; }
    .hamburger { display: flex; }
}