/* ===== Global Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;
  --indigo:#6366f1;--amber:#f59e0b;--emerald:#10b981;--pink:#ec4899;--purple:#8b5cf6;--cyan:#06b6d4;--rose:#f43f5e;--teal:#14b8a6;
  --bg:#f1f5f9;--card:#fff;--text:#1e293b;--text-light:#64748b;--border:#e2e8f0;
  --radius:12px;--shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:0 10px 25px rgba(0,0,0,.08),0 4px 6px rgba(0,0,0,.04);
  --max-width:1200px;
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text);line-height:1.7}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--primary-dark)}

/* ===== Layout ===== */
.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}
.page{min-height:100vh;padding-bottom:80px}

/* ===== Header ===== */
.header{background:linear-gradient(135deg,#1e3a5f 0%,#2563eb 100%);color:#fff;padding:48px 0 40px;position:relative;overflow:hidden}
.header::after{content:'';position:absolute;bottom:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--cyan),var(--emerald),var(--amber),var(--pink))}
.header h1{font-size:2rem;font-weight:700;margin-bottom:8px;letter-spacing:-.5px}
.header .subtitle{font-size:1.05rem;opacity:.85;max-width:700px}
.header .breadcrumb{font-size:.85rem;opacity:.7;margin-top:12px}
.header .breadcrumb a{color:#bfdbfe}
.header .breadcrumb a:hover{color:#fff;text-decoration:underline}

/* ===== Navigation ===== */
.nav{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow)}
.nav-inner{max-width:var(--max-width);margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:8px;overflow-x:auto;white-space:nowrap}
.nav-inner a{padding:14px 18px;font-size:.9rem;font-weight:500;color:var(--text-light);border-bottom:2px solid transparent;transition:all .2s;display:flex;align-items:center;gap:6px}
.nav-inner a:hover{color:var(--primary);background:var(--primary-light)}
.nav-inner a.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
.nav-inner .nav-logo{font-weight:700;font-size:1.05rem;color:var(--primary);margin-right:12px;white-space:nowrap}

/* ===== Cards ===== */
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px;margin-bottom:24px;transition:box-shadow .2s}
.card:hover{box-shadow:var(--shadow-lg)}
.card-title{font-size:1.25rem;font-weight:700;margin-bottom:16px;color:var(--text);display:flex;align-items:center;gap:8px}
.card-title .icon{width:28px;height:28px;border-radius:6px;display:inline-flex;align-items:center;justify-content:center;font-size:.9rem;color:#fff;flex-shrink:0}

/* ===== Section ===== */
.section{margin-bottom:40px}
.section-title{font-size:1.5rem;font-weight:700;margin-bottom:20px;padding-left:14px;border-left:4px solid var(--primary);color:var(--text)}

/* ===== Tables ===== */
.table-wrap{overflow-x:auto;border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}
thead th{background:#f8fafc;padding:14px 16px;text-align:left;font-weight:600;color:var(--text);border-bottom:2px solid var(--border);white-space:nowrap;position:sticky;top:0}
tbody td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text)}
tbody tr:hover{background:#f8fafc}
tbody tr:last-child td{border-bottom:none}

/* ===== Badges & Tags ===== */
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:.75rem;font-weight:600;white-space:nowrap}
.badge-blue{background:#dbeafe;color:#1d4ed8}
.badge-green{background:#d1fae5;color:#065f46}
.badge-amber{background:#fef3c7;color:#92400e}
.badge-red{background:#fee2e2;color:#991b1b}
.badge-purple{background:#ede9fe;color:#6d28d9}
.badge-pink{background:#fce7f3;color:#be185d}
.badge-gray{background:#f1f5f9;color:#475569}
.badge-indigo{background:#e0e7ff;color:#4338ca}
.badge-cyan{background:#cffafe;color:#0e7490}

.tag{display:inline-block;padding:2px 8px;border-radius:4px;font-size:.8rem;margin:2px}

/* ===== Grid ===== */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

/* ===== Color Blocks ===== */
.color-block{border-radius:var(--radius);padding:20px;color:#fff;position:relative;overflow:hidden}
.color-block h3{font-size:1.1rem;font-weight:700;margin-bottom:8px}
.color-block p{font-size:.85rem;opacity:.9}
.bg-indigo{background:linear-gradient(135deg,#6366f1,#818cf8)}
.bg-amber{background:linear-gradient(135deg,#f59e0b,#fbbf24)}
.bg-emerald{background:linear-gradient(135deg,#10b981,#34d399)}
.bg-pink{background:linear-gradient(135deg,#ec4899,#f472b6)}
.bg-purple{background:linear-gradient(135deg,#8b5cf6,#a78bfa)}
.bg-cyan{background:linear-gradient(135deg,#06b6d4,#22d3ee)}
.bg-blue{background:linear-gradient(135deg,#2563eb,#3b82f6)}
.bg-rose{background:linear-gradient(135deg,#f43f5e,#fb7185)}
.bg-teal{background:linear-gradient(135deg,#14b8a6,#2dd4bf)}

/* ===== Index Cards ===== */
.index-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:32px}
@media(max-width:900px){.index-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.index-grid{grid-template-columns:1fr}}
.index-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:all .3s;cursor:pointer;text-decoration:none;color:inherit;display:block}
.index-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);color:inherit}
.index-card .card-header{height:80px;display:flex;align-items:center;justify-content:center;font-size:2rem;color:#fff}
.index-card .card-body{padding:20px}
.index-card .card-body h3{font-size:1.1rem;font-weight:700;margin-bottom:6px;color:var(--text)}
.index-card .card-body p{font-size:.85rem;color:var(--text-light);line-height:1.5}
.index-card .card-body .tags{margin-top:10px;display:flex;flex-wrap:wrap;gap:4px}

/* ===== Download Cards ===== */
.dl-grid{grid-template-columns:repeat(2,minmax(0,1fr));max-width:760px;margin:0 auto}
.dl-card{border:1px solid var(--border)}
.dl-btn{display:inline-block;margin-top:14px;padding:9px 18px;border-radius:8px;background:var(--primary);color:#fff;font-size:.88rem;font-weight:600;transition:background .2s}
.dl-card:hover .dl-btn{background:var(--primary-dark)}
.dl-card:hover{transform:translateY(-4px)}

/* ===== Info List ===== */
.info-list{list-style:none;padding:0}
.info-list li{padding:10px 0;border-bottom:1px dashed var(--border);display:flex;align-items:flex-start;gap:8px}
.info-list li:last-child{border-bottom:none}
.info-list li::before{content:'▸';color:var(--primary);font-weight:700;flex-shrink:0}
.info-list li b{font-weight:600;color:var(--text)}

/* ===== Process Steps ===== */
.steps{display:flex;align-items:center;flex-wrap:wrap;gap:4px;margin:16px 0}
.step{background:var(--primary-light);color:var(--primary-dark);padding:8px 16px;border-radius:8px;font-size:.85rem;font-weight:500;white-space:nowrap}
.step-arrow{color:var(--text-light);font-size:1.2rem}

/* ===== SVG Container ===== */
.svg-container{width:100%;overflow-x:auto;background:#fff;border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.svg-container svg{display:block;margin:0 auto;max-width:100%;height:auto}

/* ===== Note Box ===== */
.note{background:#fffbeb;border-left:4px solid var(--amber);border-radius:8px;padding:16px 20px;margin:16px 0;font-size:.9rem;color:#78350f}
.note.blue{background:#eff6ff;border-left-color:var(--primary);color:#1e40af}
.note.green{background:#ecfdf5;border-left-color:var(--emerald);color:#065f46}

/* ===== Progress Bar ===== */
.progress-bar{width:100%;height:8px;background:#e2e8f0;border-radius:4px;overflow:hidden}
.progress-bar .fill{height:100%;border-radius:4px;transition:width .5s}

/* ===== Footer ===== */
.footer{text-align:center;padding:40px 0;color:var(--text-light);font-size:.85rem;border-top:1px solid var(--border);background:#fff}

/* ===== Utility ===== */
.text-center{text-align:center}
.mt-16{margin-top:16px}
.mt-24{margin-top:24px}
.mt-32{margin-top:32px}
.mb-16{margin-bottom:16px}
.mb-24{margin-bottom:24px}
.flex{display:flex}
.flex-wrap{flex-wrap:wrap}
.gap-8{gap:8px}
.gap-12{gap:12px}
.items-center{align-items:center}
.justify-between{justify-content:space-between}