/* ===== Reset & Base ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;background:#fff;color:#333;line-height:1.6;min-height:100vh}

/* ===== Light Theme (default) ===== */
:root{--bg:#fff;--bg-secondary:#f5f7fa;--text:#333;--text-secondary:#666;--text-muted:#999;--border:#e8e8e8;--shadow:0 2px 8px rgba(0,0,0,.06);--shadow-hover:0 8px 24px rgba(0,0,0,.1);--nav-bg:#fff;--nav-shadow:0 1px 4px rgba(0,0,0,.08);--card-bg:#fff;--card-border:#e8e8e8;--accent:#2563eb;--accent-light:#eff6ff;--footer-bg:#f5f7fa;--search-bg:#f0f2f5;--search-border:transparent}

/* ===== Dark Theme ===== */
[data-theme="dark"]{--bg:#1a1a2e;--bg-secondary:#16213e;--text:#e4e6eb;--text-secondary:#b0b3b8;--text-muted:#6c6f78;--border:#2d2d44;--shadow:0 2px 8px rgba(0,0,0,.3);--shadow-hover:0 8px 24px rgba(0,0,0,.4);--nav-bg:#1a1a2e;--nav-shadow:0 1px 4px rgba(0,0,0,.3);--card-bg:#16213e;--card-border:#2d2d44;--accent:#60a5fa;--accent-light:#1e293b;--footer-bg:#0f0f23;--search-bg:#2d2d44;--search-border:#3d3d54}

body{background:var(--bg);color:var(--text);transition:background .3s,color .3s}

/* ===== Top Navigation ===== */
.top-nav{position:fixed;top:0;left:0;right:0;height:52px;background:var(--nav-bg);box-shadow:var(--nav-shadow);z-index:1000;transition:background .3s}
.nav-inner{max-width:1200px;margin:0 auto;height:100%;display:flex;align-items:center;padding:0 20px;gap:12px}
.logo{display:flex;align-items:center;gap:8px;flex-shrink:0}
.logo img{height:28px;width:auto;display:block}
.logo span{font-size:1rem;font-weight:600;color:var(--accent);white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:4px;flex:1;overflow-x:auto;scrollbar-width:none;padding:0 8px}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{display:inline-block;padding:4px 10px;font-size:.8125rem;color:var(--text-secondary);text-decoration:none;white-space:nowrap;border-radius:4px;transition:all .2s}
.nav-links a:hover{color:var(--accent);background:var(--accent-light)}
.nav-links a.active{color:var(--accent);font-weight:600;background:var(--accent-light)}
.nav-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.search-box{position:relative}
.search-box::before{content:'🔍';position:absolute;left:10px;top:50%;transform:translateY(-50%);font-size:.75rem;opacity:.5;pointer-events:none}
#search-input{width:180px;height:32px;padding:0 12px 0 30px;border:1px solid var(--search-border);border-radius:16px;background:var(--search-bg);color:var(--text);font-size:.8125rem;outline:none;transition:all .3s}
#search-input:focus{width:220px;border-color:var(--accent);background:var(--bg);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.theme-toggle{width:32px;height:32px;border:none;border-radius:50%;background:var(--search-bg);cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0}
.theme-toggle:hover{background:var(--accent-light);transform:scale(1.1)}

/* ===== Main Content ===== */
.main-content{max-width:1200px;margin:0 auto;padding:72px 20px 40px}

/* ===== Category Section ===== */
.cat-section{margin-bottom:40px;scroll-margin-top:65px}
.cat-title{font-size:1.125rem;font-weight:600;color:var(--text);margin-bottom:16px;padding-left:14px;border-left:3px solid var(--accent);line-height:1.4}
.cat-count{font-size:.8125rem;color:var(--text-muted);font-weight:400;margin-left:6px}

/* ===== Link Grid ===== */
.link-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.link-card{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--card-bg);border:1px solid var(--card-border);border-radius:8px;text-decoration:none;transition:all .25s ease}
.link-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:var(--accent)}
.link-icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.875rem;font-weight:700;color:#fff;flex-shrink:0}
.link-text{display:flex;flex-direction:column;min-width:0;flex:1}
.link-name{font-size:.875rem;font-weight:500;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.link-desc{font-size:.75rem;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;margin-top:2px}
.link-card:hover .link-name{color:var(--accent)}

/* ===== Category Icon Colors ===== */
/* Distinct gradient colors for each category */
.cat-section:nth-child(1) .link-icon{background:linear-gradient(135deg,#667eea,#764ba2)}
.cat-section:nth-child(2) .link-icon{background:linear-gradient(135deg,#f093fb,#f5576c)}
.cat-section:nth-child(3) .link-icon{background:linear-gradient(135deg,#4facfe,#00f2fe)}
.cat-section:nth-child(4) .link-icon{background:linear-gradient(135deg,#43e97b,#38f9d7)}
.cat-section:nth-child(5) .link-icon{background:linear-gradient(135deg,#fa709a,#fee140)}
.cat-section:nth-child(6) .link-icon{background:linear-gradient(135deg,#a18cd1,#fbc2eb)}
.cat-section:nth-child(7) .link-icon{background:linear-gradient(135deg,#fccb90,#d57eeb)}
.cat-section:nth-child(8) .link-icon{background:linear-gradient(135deg,#e0c3fc,#8ec5fc)}
.cat-section:nth-child(9) .link-icon{background:linear-gradient(135deg,#f5576c,#ff6f61)}
.cat-section:nth-child(10) .link-icon{background:linear-gradient(135deg,#667eea,#43e97b)}
.cat-section:nth-child(11) .link-icon{background:linear-gradient(135deg,#ffecd2,#fcb69f)}
.cat-section:nth-child(12) .link-icon{background:linear-gradient(135deg,#89f7fe,#66a6ff)}

/* ===== Footer ===== */
footer{background:var(--footer-bg);border-top:1px solid var(--border);padding:20px;text-align:center;font-size:.8125rem;color:var(--text-muted);transition:background .3s}
.footer-inner{max-width:1200px;margin:0 auto}

/* ===== Responsive ===== */
@media(max-width:768px){
  .nav-inner{padding:0 12px;gap:6px}
  .logo span{display:none}
  .nav-links{overflow-x:auto;gap:2px}
  .nav-links a{padding:4px 8px;font-size:.75rem}
  .search-box::before{display:none}
  #search-input{width:120px;font-size:.75rem}
  #search-input:focus{width:140px}
  .link-grid{grid-template-columns:1fr}
  .main-content{padding:64px 12px 24px}
  .cat-title{font-size:1rem}
}

@media(max-width:480px){
  #search-input{width:90px}
  #search-input:focus{width:110px}
}