/* ============================================
   易歪歪 - 全局共享样式
   CSS Variables + Common Components
   ============================================ */

:root {
  --brand: #587fcb;
  --brand-dark: #3d5fa8;
  --brand-light: #7b9de0;
  --brand-bg: rgba(88,127,203,0.1);
  --brand-bg-light: rgba(88,127,203,0.05);
  --bg: #f8f9fc;
  --bg-white: #fff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-muted: #8b8fa5;
  --border: #e8e8ef;
  --border-hover: #d0d7f0;
  --radius-sm: 8px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 24px rgba(88,127,203,0.1);
  --shadow-lg: 0 12px 40px rgba(88,127,203,0.1);
  --shadow-xl: 0 20px 60px rgba(88,127,203,0.12);
  --transition: all 0.3s ease;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* Reset */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-stack);color:var(--text);line-height:1.6;background:var(--bg-white);-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}

/* Reduced motion */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition-duration:0.01ms!important;scroll-behavior:auto!important}
}

.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* ============================================
   Header
   ============================================ */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);box-shadow:var(--shadow-sm);transition:var(--transition)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px}
.logo img{width:40px;height:40px}
.logo span{font-size:22px;font-weight:700;color:var(--brand)}
.nav{display:flex;align-items:center;gap:32px;list-style:none}
.nav a{font-size:15px;color:#4a4a5a;transition:color 0.2s;font-weight:500;padding:8px 0;position:relative}
.nav a:hover,.nav a.active{color:var(--brand)}
.nav a.active::after{content:'';position:absolute;bottom:0;left:0;right:0;height:2px;background:var(--brand);border-radius:1px}
.nav-cta{background:var(--brand);color:#fff!important;padding:10px 24px!important;border-radius:var(--radius-sm);font-weight:600!important;transition:var(--transition)!important}
.nav-cta:hover{background:var(--brand-dark)!important;transform:translateY(-1px);box-shadow:0 4px 12px rgba(88,127,203,0.4)}
.nav-cta.active{color:#fff!important}
.nav-cta.active::after{display:none}

/* Hamburger */
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none;z-index:1001}
.hamburger span{display:block;width:24px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition)}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
.mobile-nav{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(10px);z-index:999;padding:100px 20px 40px;flex-direction:column;gap:12px;align-items:center;overflow-y:auto}
.mobile-nav a{font-size:18px;font-weight:600;color:var(--text);padding:12px 20px;border-radius:var(--radius);transition:background 0.2s;display:block;text-align:center}
.mobile-nav a:hover{background:var(--brand-bg);color:var(--brand)}
.mobile-nav a.active{color:var(--brand)}
.mobile-nav .nav-cta{color:#fff!important;margin-top:8px}

/* ============================================
   Buttons
   ============================================ */
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:#fff;padding:14px 32px;border-radius:var(--radius);font-size:16px;font-weight:600;transition:var(--transition);border:none;cursor:pointer;text-decoration:none}
.btn-primary:hover{background:var(--brand-dark);transform:translateY(-2px);box-shadow:0 8px 24px rgba(88,127,203,0.35)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;background:transparent;color:var(--brand);padding:14px 32px;border-radius:var(--radius);font-size:16px;font-weight:600;border:2px solid var(--brand);transition:var(--transition);cursor:pointer;text-decoration:none}
.btn-outline:hover{background:var(--brand);color:#fff;transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:14px}

/* Section */
.section{padding:100px 0}
.section-header{text-align:center;margin-bottom:60px}
.section-header h2{font-size:36px;font-weight:800;color:var(--text);margin-bottom:16px}
.section-header p{font-size:17px;color:var(--text-secondary);max-width:600px;margin:0 auto}

/* ============================================
   Footer
   ============================================ */
.footer{background:var(--text);color:#b0b3c2;padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand img{width:36px;height:36px}
.footer-brand span{font-size:20px;font-weight:700;color:#fff}
.footer-about p{font-size:14px;line-height:1.7;color:var(--text-muted)}
.footer h4{color:#fff;font-size:16px;font-weight:600;margin-bottom:20px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:12px}
.footer ul a{color:var(--text-muted);font-size:14px;transition:color 0.2s}
.footer ul a:hover{color:var(--brand)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:24px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;font-size:13px}
.footer-bottom a{color:var(--text-muted);transition:color 0.2s}
.footer-bottom a:hover{color:var(--brand)}

/* Breadcrumb */
.breadcrumb{background:var(--bg);padding:90px 0 16px;font-size:14px;color:var(--text-secondary)}
.breadcrumb a{color:var(--brand);transition:color 0.2s}
.breadcrumb a:hover{color:var(--brand-dark)}
.breadcrumb span{color:var(--text-secondary)}

/* Page Hero (inner pages) */
.page-hero{background:linear-gradient(135deg,#f0f4ff 0%,#e8f0fe 50%,#f5f7fa 100%);padding:140px 0 80px;text-align:center;position:relative;overflow:hidden}
.page-hero::before{content:'';position:absolute;top:-100px;right:-100px;width:400px;height:400px;background:radial-gradient(circle,var(--brand-bg) 0%,transparent 70%);border-radius:50%}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{font-size:42px;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.page-hero p{font-size:18px;color:var(--text-secondary);max-width:600px;margin:0 auto;line-height:1.7}

/* Cards (shared) */
.card{background:var(--bg-white);border-radius:var(--radius-lg);padding:32px 28px;border:1px solid var(--border);transition:var(--transition)}
.card-hover:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--border-hover)}

/* Grid helpers */
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px}

/* Toast */
.toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);background:var(--text);color:#fff;padding:12px 24px;border-radius:var(--radius);font-size:15px;z-index:9999;opacity:0;transition:opacity 0.3s;pointer-events:none;box-shadow:0 4px 16px rgba(0,0,0,0.2)}
.toast.show{opacity:1}
.toast.success{background:#10b981}

/* Skip link */
.skip-link{position:absolute;top:-100px;left:16px;background:var(--brand);color:#fff;padding:8px 16px;border-radius:0 0 var(--radius-sm) var(--radius-sm);z-index:10000;font-size:14px;font-weight:600;transition:top 0.2s}
.skip-link:focus{top:0}

/* Responsive */
@media(max-width:768px){
  .header-inner{height:64px}
  .nav{display:none}
  .hamburger{display:flex}
  .mobile-nav.active{display:flex}
  .page-hero{padding:120px 0 60px}
  .page-hero h1{font-size:32px}
  .page-hero p{font-size:16px}
  .section{padding:60px 0}
  .section-header h2{font-size:28px}
  .section-header p{font-size:15px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:30px}
  .container{padding:0 16px}
  .btn-primary,.btn-outline{padding:12px 24px;font-size:15px}
}