/* ==================== Reset & Variables ==================== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{--primary:#1565C0;--primary-dark:#0D47A1;--primary-light:#E3F2FD;--accent-color:#FF6D00;--accent:#FFF3E0;--text:#1a1a1a;--text-light:#666;--text-muted:#999;--bg:#fff;--bg-gray:#f5f6f8;--bg-dark:#0f1729;--border:#e8eaed;--border-light:#f0f1f3;--radius:10px;--radius-sm:6px;--radius-lg:16px;--shadow:0 2px 16px rgba(0,0,0,.06);--shadow-md:0 4px 24px rgba(0,0,0,.08);--shadow-lg:0 8px 40px rgba(0,0,0,.12);--max-width:1200px;--header-h:68px}

/* ==================== Global Typography ==================== */
html{scroll-behavior:smooth;font-size:16px;-webkit-font-smoothing:antialiased}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.76;letter-spacing:.01em}
a{color:var(--primary);text-decoration:none;transition:all .25s ease}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}

/* ==================== Header / Navigation ==================== */
.header{background:rgba(255,255,255,.96);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.header .logo{font-size:22px;font-weight:800;color:var(--primary);white-space:nowrap;letter-spacing:-.5px;display:flex;align-items:center;gap:8px}
.header .logo::before{content:'';display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--accent-color)}
.header .logo img{height:40px;width:auto}
.header nav{display:flex;gap:4px;align-items:center}
.header nav a{color:var(--text);font-size:14px;font-weight:700;position:relative;padding:13px 15px;transition:color .25s;letter-spacing:.02em}
.header nav a::after{content:'';position:absolute;bottom:7px;left:15px;right:15px;height:2px;background:var(--primary);transform:scaleX(0);transition:transform .3s ease}
.header nav a:hover::after,.header nav a.active::after{transform:scaleX(1)}
.header nav a:hover,.header nav a.active{color:var(--primary)}

/* ==================== Dropdown Sub Navigation ==================== */
.nav-item{position:relative}
.nav-arrow{font-size:10px;margin-left:4px;opacity:.5;transition:all .3s;display:inline-block;vertical-align:middle}
.nav-item:hover>.nav-arrow{opacity:1;transform:rotate(180deg)}
.nav-sub{position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(4px);background:var(--bg);box-shadow:0 2px 15px rgba(0,0,0,.12);padding:0;min-width:140px;opacity:0;visibility:hidden;transition:all .25s ease;z-index:200}
.nav-item:hover .nav-sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.nav-sub a{display:block;padding:13px 20px;font-size:13px;color:var(--text);white-space:nowrap;transition:all .2s;border-bottom:1px solid var(--border)}
.nav-sub a:last-child{border-bottom:none}
.nav-sub a:hover{background:var(--bg-gray);color:var(--primary)}
.nav-sub a.sub-active{color:var(--primary);font-weight:600;background:var(--bg-gray)}
.nav-has-sub>a::after{content:none !important}
.mobile-menu-btn{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--text);padding:6px;line-height:1}

/* ==================== Breadcrumb ==================== */
.breadcrumb{padding:14px 0;font-size:14px;color:var(--text-light);border-bottom:1px solid var(--border);margin-bottom:30px}
.breadcrumb a{color:var(--text-light)}

/* ==================== Pagination ==================== */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:40px;flex-wrap:wrap}
.pagination a,.pagination span{padding:10px 16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:14px;transition:all .25s;font-weight:500}
.pagination a:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.pagination .current{background:var(--primary);color:#fff;border-color:var(--primary)}
.pagination .disabled{color:#ccc;pointer-events:none}
.empty-tip{text-align:center;padding:60px;color:var(--text-light)}

/* ==================== Footer ==================== */
.footer{background:var(--bg-dark);color:#8892a4;padding:56px 0 0;font-size:14px;margin-top:60px}
.footer .container{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer-col h4{color:#d0d5dd;font-size:18px;margin-bottom:20px;font-weight:700;position:relative;padding-bottom:14px}
.footer-col h4::after{content:'';position:absolute;bottom:0;left:0;width:32px;height:2.5px;background:var(--primary);border-radius:2px}
.footer-col p,.footer-col a{color:#8892a4;margin:8px 0;display:block;transition:color .25s;line-height:1.8}
.footer-col a:hover{color:#fff;padding-left:4px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:44px;padding:20px 0;text-align:center;color:#5f6b7d;font-size:13px}

/* ==================== Page Header (shared) ==================== */
.page-header{text-align:center;padding:30px 0}
.page-header h1{font-size:28px;margin-bottom:8px}
.page-header p{color:var(--text-light)}

/* ==================== Section Title (shared) ==================== */
.section{padding:80px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:30px;font-weight:700;color:var(--text);margin-bottom:12px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:48px;height:3px;background:var(--primary);margin:12px auto 0;border-radius:2px}
.section-title p{color:var(--text-light);font-size:15px;max-width:600px;margin:0 auto}

/* ==================== Responsive ==================== */
@media (max-width:768px){
    .section{padding:48px 0}
    .section-title h2{font-size:24px}
    .section-title h2::after{width:36px;height:3px;margin-top:10px}
    .container{padding:0 16px}
    .header nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:var(--bg);flex-direction:column;gap:0;box-shadow:var(--shadow-lg);border-top:1px solid var(--border-light)}
    .header nav.open{display:flex}
    .header nav a{padding:15px 24px;border-bottom:1px solid var(--border-light);font-size:15px}
    .header nav a::after{display:none}
    .nav-item{position:static;border-bottom:1px solid var(--border-light)}
    .nav-item>a{border-bottom:none}
    .nav-arrow{float:right;font-size:14px;padding:0 6px}
    .nav-sub{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-radius:0;padding:0;display:none;background:var(--bg-gray)}
    .nav-item .nav-sub.show{display:block}
    .nav-sub a{padding:13px 24px 13px 40px;font-size:13px;border-bottom:1px solid var(--border)}
    .mobile-menu-btn{display:block}
    .footer .container{grid-template-columns:1fr;gap:28px;text-align:center}
    .footer-col h4::after{left:50%;transform:translateX(-50%)}
    .footer-col a:hover{padding-left:0}
    .footer-bottom{margin-top:32px}
}
@media (max-width:480px){
    .section-title h2{font-size:20px}
    .page-header h1{font-size:22px}
}