/* ============================================================
   配色体系 — Electric Blue（统一科技蓝基调）
   主色  Electric Blue — 按钮 / 聚焦 / 分页 / 交互
   文字  Slate 层级 — primary / secondary / muted 三级灰
   分类色 Electric Blue / Deep Blue / Sky Blue — 仅用于分类边框区分
   ============================================================ */

/* ============ CSS Variables : light ============ */
:root {
  /* ── 背景 (Light Theme with Apple Red Accent) ── */
  --bg-primary:    #f6f5f8;
  --bg-secondary:  #ffffff;
  --bg-card:       #ffffff;
  --bg-glass:      rgba(255,255,255,0.88);
  --bg-elevated:   #f0eff3;
  --text-primary:  #1a1a1f;
  --text-secondary:#4a4a52;
  --text-muted:    #8a8a95;
  --border:        rgba(26,26,31,0.12);
  --border-strong: rgba(26,26,31,0.20);

  /* ── 主色 (Electric Blue) ── */
  --primary:            #003dfe;
  --primary-hover:      #0033d9;
  --primary-light:      rgba(0,61,254,0.12);
  --primary-glow:       rgba(0,61,254,0.25);

  /* ── 分类色（Electric Blue / Deep Blue / Sky Blue） ── */
  --cat-blue:   #003dfe;
  --cat-cyan:   #0039ff;
  --cat-green:  #003dff;

  /* ── 强调色（与主色同系） ── */
  --accent:        #003dfe;
  --accent-hover:  #0033d9;
  --accent-light:  rgba(0,61,254,0.12);
  --accent-glow:   rgba(0,61,254,0.25);

  /* ── 状态色 ── */
  --status-red:    #ef4444;
  --status-yellow: #f59e0b;

  /* ── 字体 (Apple-style) ── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

  /* ── 字体权重 ── */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* ── 结构 ── */
  --radius:    14px;
  --radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --sidebar-width: 240px;
  --header-height:  64px;
  --header-gap:     36px;
  --footer-gap:     36px;

  /* ── 阴影 ── */
  --shadow:       0 1px 2px rgba(26,26,31,0.04), 0 4px 12px rgba(26,26,31,0.06);
  --shadow-hover: 0 8px 24px rgba(0,61,254,0.12), 0 2px 8px rgba(26,26,31,0.06);
  --shadow-glow:  0 0 0 3px var(--primary-glow);
}

/* ============ CSS Variables : dark ============ */
[data-theme="dark"] {
  /* ── 背景 (Dark Theme with Apple Red Accent) ── */
  --bg-primary:    #0a0a0d;
  --bg-secondary:  #121218;
  --bg-card:       #15151c;
  --bg-glass:      rgba(18,18,24,0.85);
  --bg-elevated:   #1a1a22;
  --text-primary:  #f5f5f7;
  --text-secondary:#c4c4cc;
  --text-muted:    #7a7a85;
  --border:        rgba(246,245,248,0.10);
  --border-strong: rgba(246,245,248,0.18);

  /* ── 主色（暗色下柔和提亮） ── */
  --primary:        #3d6fff;
  --primary-hover:  #5a85ff;
  --primary-light:  rgba(61,111,255,0.18);
  --primary-glow:   rgba(61,111,255,0.35);

  /* ── 分类色 ── */
  --cat-blue:   #3d6fff;
  --cat-cyan:   #2d5fef;
  --cat-green:  #1d4fdf;

  /* ── 强调色 ── */
  --accent:        #3d6fff;
  --accent-hover:  #5a85ff;
  --accent-light:  rgba(61,111,255,0.18);
  --accent-glow:   rgba(61,111,255,0.35);

  /* ── 状态色 ── */
  --status-red:    #fca5a5;
  --status-yellow: #fcd34d;

  /* ── 阴影（带环境蓝光） ── */
  --shadow:       0 1px 0 rgba(0,61,254,0.15), 0 4px 16px rgba(0,0,0,0.4);
  --shadow-hover: 0 12px 36px rgba(0,0,0,0.5), 0 0 24px rgba(61,111,255,0.20);
  --shadow-glow:  0 0 0 3px var(--primary-glow);
}

/* ============ Reset ============ */
*,*::before,*::after{ margin:0; padding:0; box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  min-height:100vh; display:flex; flex-direction:column; overflow-x:hidden;
  background-color:var(--bg-primary);
  color:var(--text-primary);
  font-family:var(--font-sans);
  font-size:15px; line-height:1.65;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}

/* 主题切换过渡动画 - 只应用于颜色相关属性 */
body.theme-transitioning{
  transition:background-color 0.4s ease, color 0.4s ease !important;
}
body.theme-transitioning .header,
body.theme-transitioning .sidebar,
body.theme-transitioning .footer,
body.theme-transitioning .link-card,
body.theme-transitioning .page-btn,
body.theme-transitioning .category-item,
body.theme-transitioning .quick-tag,
body.theme-transitioning .search-box input,
body.theme-transitioning .icon-btn,
body.theme-transitioning .clock{
  transition:background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease !important;
}

/* 主题切换时禁用backdrop-filter避免抖动 */
body.theme-transitioning .header,
body.theme-transitioning .sidebar,
body.theme-transitioning .footer,
body.theme-transitioning .link-card,
body.theme-transitioning .modal,
body.theme-transitioning .toast{
  backdrop-filter:none !important;
  -webkit-backdrop-filter:none !important;
}

/* 背景元素使用更长的过渡时间 */
body.theme-transitioning .bg-orbs .orb,
body.theme-transitioning .bg-grid{
  transition:opacity 0.6s ease !important;
}
a{ text-decoration:none; color:inherit; }
ul{ list-style:none; }

/* ============ Dark Mode Base ============ */
[data-theme="dark"] body{
  background:
    radial-gradient(ellipse 90% 60% at 50% -15%, rgba(61,111,255,0.06), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 80%, rgba(45,95,239,0.05), transparent 50%),
    radial-gradient(ellipse 40% 35% at 0% 60%, rgba(29,79,223,0.04), transparent 45%),
    var(--bg-primary);
}

/* ============ Background Grid ============ */
.bg-grid{
  position:fixed; inset:0; z-index:0; pointer-events:none;
  background-image:radial-gradient(circle at 1px 1px, var(--border) 1px, transparent 0);
  background-size:32px 32px;
  mask-image:radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse at center, black 30%, transparent 80%);
  opacity:0.5;
}
[data-theme="dark"] .bg-grid{
  background-image:radial-gradient(circle at 1px 1px, rgba(196,30,58,0.08) 1px, transparent 0);
  opacity:0.65;
}


/* ============ Background Orbs ============ */
.bg-orbs{ position:fixed; inset:0; z-index:0; pointer-events:none; overflow:hidden; }
.orb{ position:absolute; border-radius:50%; filter:blur(90px); opacity:0.35; animation:orbFloat 20s ease-in-out infinite; }
.orb-1{ width:480px; height:480px; background:radial-gradient(circle, rgba(0,61,254,0.06), transparent 70%); top:-140px; right:-100px; }
.orb-2{ width:380px; height:380px; background:radial-gradient(circle, rgba(0,57,255,0.08), transparent 70%); bottom:8%; left:-120px; animation-delay:-7s; }
.orb-3{ width:300px; height:300px; background:radial-gradient(circle, rgba(0,61,255,0.10), transparent 70%); top:45%; right:15%; animation-delay:-14s; }
[data-theme="dark"] .orb-1{ width:520px; height:520px; background:radial-gradient(circle, rgba(61,111,255,0.10), transparent 68%); }
[data-theme="dark"] .orb-2{ width:420px; height:420px; background:radial-gradient(circle, rgba(45,95,239,0.08), transparent 68%); }
[data-theme="dark"] .orb-3{ width:340px; height:340px; background:radial-gradient(circle, rgba(29,79,223,0.06), transparent 68%); }
[data-theme="dark"] .orb{ opacity:0.32; filter:blur(100px); }
@keyframes orbFloat{
  0%,100%{ transform:translate(0,0) scale(1); }
  33%{ transform:translate(30px,-20px) scale(1.05); }
  66%{ transform:translate(-20px,15px) scale(0.95); }
}

/* ============ Header ============ */
.header{
  position:fixed; top:0; left:var(--sidebar-width); right:0; height:var(--header-height);
  background:var(--bg-glass); backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border); z-index:110; box-shadow:var(--shadow);
  transition:left 0.3s cubic-bezier(0.4,0,0.2,1);
}
body.sidebar-collapsed .header{ left:70px; }
.header-inner{
  height:100%; display:flex; align-items:center; justify-content:space-between;
  padding:0 24px; max-width:1400px; margin:0 auto;
}
.header-left{ display:flex; align-items:center; gap:12px; flex-shrink:0; min-width:0; }

/* slogan 用主色蓝左侧竖线 */
.header-slogan{
  color:var(--text-secondary); white-space:nowrap; margin:0;
  border-left:3px solid var(--primary); padding-left:12px; line-height:1.2;
  font-size:0.875rem; font-weight:var(--font-weight-medium); letter-spacing:0.01em;
}

/* Logo 用强调紫 */
.logo{
  display:flex; align-items:center; gap:10px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
  color:var(--text-primary);
  font-size:1.25rem; font-weight:var(--font-weight-bold); letter-spacing:-0.02em;
}
.logo i{ flex-shrink:0; font-size:1.35rem; color:var(--primary); }
[data-theme="dark"] .logo i{ color:#fff; }

.header-center{ flex:1; display:flex; justify-content:center; max-width:480px; margin:0 24px; }
.header-right{ display:flex; align-items:center; gap:12px; flex-shrink:0; }


.clock{
  color:var(--text-muted); font-variant-numeric:tabular-nums; background:var(--bg-primary);
  padding:5px 14px; border-radius:20px; border:1px solid var(--border); white-space:nowrap;
  font-size:0.82rem; font-weight:var(--font-weight-medium); font-family:var(--font-mono);
}

/* icon 按钮 — hover 用主色蓝 */
.icon-btn{
  background:var(--bg-primary); border:1px solid var(--border); color:var(--text-primary);
  width:38px; height:38px; border-radius:50%; cursor:pointer; transition:var(--transition);
  display:flex; align-items:center; justify-content:center;
  font-size:1rem;
}
.icon-btn:hover{ background:var(--primary); color:#fff; border-color:var(--primary); transform:translateY(-1px); box-shadow:0 4px 12px var(--primary-glow); }

/* ============ Search Box ============ */
.search-box{ position:relative; width:100%; }
.search-box .search-icon{ position:absolute; left:14px; top:50%; transform:translateY(-50%); color:var(--text-muted); pointer-events:none; font-size:0.9rem; }
.search-box input{
  width:100%; padding:10px 36px 10px 38px; background:var(--bg-primary); border:1px solid var(--border);
  border-radius:24px; color:var(--text-primary); outline:none; transition:var(--transition);
  font-size:0.9rem; font-family:inherit;
}
/* 聚焦用主色蓝 */
.search-box input:focus{ border-color:var(--primary); box-shadow:var(--shadow-glow); background:var(--bg-card); }
.search-box input::placeholder{ color:var(--text-muted); }
.search-shortcut{
  position:absolute; right:36px; top:50%; transform:translateY(-50%); color:var(--text-muted);
  background:var(--bg-secondary); padding:2px 6px; border-radius:4px; border:1px solid var(--border);
  pointer-events:none; opacity:0.7;
  font-size:0.7rem; font-weight:var(--font-weight-regular); font-family:var(--font-mono);
}
.search-clear{
  position:absolute; right:8px; top:50%; transform:translateY(-50%); background:none; border:none;
  color:var(--text-muted); cursor:pointer; padding:5px; display:none; transition:var(--transition);
  border-radius:50%; width:22px; height:22px;
  font-size:0.8rem;
}
.search-clear:hover{ color:var(--text-primary); background:var(--border); }
.mobile-search-wrapper{ display:none; margin-bottom:16px; }

/* ============ Sidebar ============ */
.sidebar{
  position:fixed; top:0; left:0; bottom:0; width:var(--sidebar-width);
  background:var(--bg-glass); backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  border-right:1px solid var(--border); overflow-y:auto; overflow-x:hidden; z-index:120;
  display:flex; flex-direction:column; transition:width 0.3s cubic-bezier(0.4,0,0.2,1);
}
.sidebar.collapsed{ width:70px; }
.sidebar-header{
  display:flex; align-items:center; justify-content:space-between; flex-shrink:0;
  padding:0 16px 0 20px; height:var(--header-height); border-bottom:1px solid var(--border); gap:8px;
}
.sidebar.collapsed .sidebar-header{ padding:0 12px; justify-content:center; }
.sidebar-header .logo{ flex:1; min-width:0; transition:opacity 0.3s ease; }
.sidebar.collapsed .sidebar-header .logo span{ opacity:0; width:0; overflow:hidden; }
.sidebar-close{ display:none; }
.category-list{ padding:12px 0; flex:1; overflow-y:auto; }


/* ---- 分类项 — 3 分类色循环 ---- */
.category-item{
  display:flex; align-items:center; gap:12px; padding:11px 20px; margin:0 10px;
  cursor:pointer; transition:var(--transition); color:var(--text-secondary);
  border-radius:var(--radius-sm); border-left:3px solid transparent; white-space:nowrap; position:relative;
  font-size:0.92rem; font-weight:var(--font-weight-medium);
}
.sidebar.collapsed .category-item{ padding:11px 0; margin:0 8px; justify-content:center; gap:0; border-left:none; }
.sidebar.collapsed .category-item span{ display:none; }
.sidebar.collapsed .category-item .category-count{ display:none; }

.category-item:hover{ background:var(--primary-light); color:var(--text-primary); }
/* active 用主色蓝 */
.category-item.active{ background:var(--primary-light); border-left-color:var(--primary); box-shadow:0 2px 8px var(--primary-glow); font-weight:var(--font-weight-semibold); }
.sidebar.collapsed .category-item.active{ border-left:none; position:relative; }
.sidebar.collapsed .category-item.active::before{
  content:''; position:absolute; left:0; top:50%; transform:translateY(-50%);
  width:3px; height:60%; background:var(--primary); border-radius:0 3px 3px 0;
}
.sidebar.collapsed .category-item i{ font-size:1.1rem; }

/* 图标 */
.category-item i{
  width:20px; text-align:center; flex-shrink:0; transition:color 0.3s ease, transform 0.3s ease;
  font-size:0.95rem; color:var(--text-muted);
}
.category-item.active i,
.category-item:hover i{ color:var(--primary); }

.category-count{
  margin-left:auto; background:var(--bg-primary); color:var(--text-muted);
  padding:2px 8px; border-radius:10px; transition:var(--transition);
  font-size:0.72rem; font-weight:var(--font-weight-semibold);
}
/* active count 用主色蓝 */
.category-item.active .category-count{ background:var(--primary); color:#fff; }
.category-item:hover .category-count{ background:var(--primary-light); color:var(--text-primary); }

/* collapsed tooltip */
.sidebar.collapsed .category-item::after{
  content:attr(data-category); position:absolute; left:100%; margin-left:12px; padding:6px 12px;
  background:var(--bg-card); border:1px solid var(--border); border-radius:8px;
  color:var(--text-primary); white-space:nowrap; opacity:0; pointer-events:none;
  transition:opacity 0.2s ease; z-index:1000; box-shadow:var(--shadow-hover);
  font-size:0.85rem;
}
.sidebar.collapsed .category-item:hover::after{ opacity:1; }
.sidebar-overlay{ display:none; }

/* ============ Main ============ */
main{
  position:relative; z-index:1; flex:1; margin-left:var(--sidebar-width);
  padding:calc(var(--header-height) + var(--header-gap)) 30px 24px;
  max-width:calc(1100px + var(--sidebar-width)); width:100%;
  transition:margin-left 0.3s cubic-bezier(0.4,0,0.2,1);
}
body.sidebar-collapsed main{ margin-left:70px; max-width:calc(1100px + 70px); }


/* menu-btn（移动端） */
.menu-btn{
  display:none; background:none; border:1px solid var(--border); color:var(--text-primary);
  width:36px; height:36px; border-radius:var(--radius-sm); cursor:pointer;
  align-items:center; justify-content:center; transition:var(--transition);
  font-size:1rem; font-family:inherit;
}
.menu-btn:hover{ background:var(--primary-light); color:var(--text-primary); }

/* ============ Quick Tags ============ */
.quick-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:16px; animation:fadeInUp 0.5s ease 0.1s both; }
.quick-tag{
  display:inline-flex; align-items:center; gap:6px; padding:5px 12px;
  background:var(--bg-card); border:1px solid var(--border); border-radius:20px;
  color:var(--text-secondary); cursor:pointer; transition:var(--transition); user-select:none;
  font-size:0.82rem; font-weight:var(--font-weight-medium);
}
.quick-tag:hover{ border-color:var(--primary); background:var(--primary-light); color:var(--text-primary); transform:translateY(-1px); }
/* active 用主色蓝 */
.quick-tag.active{ background:var(--primary); border-color:var(--primary); color:#fff; box-shadow:0 2px 8px var(--primary-glow); font-weight:var(--font-weight-medium); }

/* ============ Link List ============ */
.link-list{
  display:grid; grid-template-columns:repeat(auto-fit, minmax(280px,1fr)); gap:18px;
  min-height:200px; align-items:start; margin-top:25px;
}
.link-card{
  display:flex; align-items:center; gap:15px; padding:18px 20px; height:fit-content; min-height:92px;
  background:var(--bg-card); border:1px solid var(--border); border-radius:15px;
  transition:transform 0.35s cubic-bezier(0.4,0,0.2,1), border-color 0.35s ease, box-shadow 0.35s ease; cursor:pointer; position:relative;
  overflow:hidden; backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  text-decoration:none; box-shadow:0 2px 8px rgba(0,0,0,0.04);
  will-change:transform;
}
/* 顶部渐变条 */
.link-card::before{
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:var(--primary);
  opacity:0; transition:opacity 0.35s ease;
}
.link-card::after{
  content:''; position:absolute; inset:0;
  background:radial-gradient(circle at top right, var(--primary-light), transparent 60%);
  opacity:0; transition:opacity 0.35s ease; pointer-events:none;
}
/* hover 用主色蓝边框 */
.link-card:hover{ border-color:var(--primary); box-shadow:var(--shadow-hover); transform:translateY(-4px); }
.link-card:hover::before{ opacity:1; }
.link-card:hover::after{ opacity:1; }


/* 图标容器 */
.link-icon{
  width:54px; height:54px; border-radius:14px;
  background:var(--primary-light);
  color:var(--primary); display:flex; align-items:center; justify-content:center;
  flex-shrink:0; transition:transform 0.35s cubic-bezier(0.4,0,0.2,1), box-shadow 0.35s ease, background-color 0.35s ease; position:relative; z-index:1;
  box-shadow:0 2px 8px rgba(0,61,254,0.10);
  font-size:1.45rem;
}
[data-theme="dark"] .link-icon{ box-shadow:0 2px 8px rgba(52,211,153,0.08); }
.link-icon::before{
  content:''; position:absolute; inset:0; border-radius:14px;
  background:var(--primary);
  opacity:0; transition:opacity 0.35s ease;
}
.link-icon i{ position:relative; z-index:1; }
.link-card:hover .link-icon{ transform:scale(1.06); box-shadow:0 6px 20px var(--primary-glow); }
.link-card:hover .link-icon::before{ opacity:1; }
.link-card:hover .link-icon i{ color:#fff; }

.link-info{ flex:1; min-width:0; position:relative; z-index:1; display:flex; flex-direction:column; gap:5px; }
.link-name{ white-space:nowrap; overflow:hidden; text-overflow:ellipsis; display:block; transition:transform 0.3s ease; line-height:1.35; font-size:0.96rem; font-weight:var(--font-weight-semibold); letter-spacing:-0.01em; color:var(--text-secondary); font-family:-apple-system,BlinkMacSystemFont,'PingFang SC','Noto Sans SC','Hiragino Sans GB','Microsoft YaHei','Source Han Sans CN',sans-serif; }
.link-card:hover .link-name{ transform:translateX(2px); }

.link-desc{
  color:var(--text-muted); line-height:1.55; display:-webkit-box;
  -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; transition:color 0.3s ease;
  font-size:0.78rem; font-weight:var(--font-weight-regular);
}
.link-card:hover .link-desc{ color:var(--text-secondary); }
.link-url{ display:none; }

/* 箭头 — hover 用主色蓝渐变 */
.link-arrow{
  color:var(--text-muted); opacity:0; transition:opacity 0.35s cubic-bezier(0.4,0,0.2,1), transform 0.35s cubic-bezier(0.4,0,0.2,1), background-color 0.35s ease, border-color 0.35s ease;
  position:absolute; z-index:1; top:18px; right:18px; width:34px; height:34px;
  display:flex; align-items:center; justify-content:center; border-radius:50%;
  background:var(--bg-primary); border:1px solid var(--border);
  font-size:0.9rem;
}
.link-card:hover .link-arrow{
  opacity:1; color:#fff; background:var(--primary);
  border-color:transparent; transform:translate(3px,-3px);
  box-shadow:0 4px 14px var(--primary-glow);
}

/* 搜索高亮 — 状态红 */
.link-name mark, .link-desc mark{
  display:inline; margin:0; padding:0; border:0; border-radius:0;
  background:none; box-shadow:none; color:var(--status-red); text-decoration:none;
}

/* ============ 分类色卡片（category-color-*） — 仅边框区分 ============ */
.link-card.category-color-1:hover{ border-color:var(--cat-blue); }
.link-card.category-color-2:hover{ border-color:var(--cat-cyan); }
.link-card.category-color-3:hover{ border-color:var(--cat-green); }
.link-card.category-color-4:hover{ border-color:var(--cat-blue); }
.link-card.category-color-5:hover{ border-color:var(--cat-cyan); }
.link-card.category-color-6:hover{ border-color:var(--cat-green); }

/* ============ Pagination ============ */
.pagination{
  display:flex; align-items:center; justify-content:center; gap:6px; margin-top:32px;
  padding-top:20px; padding-bottom:20px; border-top:1px solid var(--border); min-height:78px;
}
.page-btn{
  min-width:38px; height:38px; padding:0 10px; background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius-sm); color:var(--text-secondary); cursor:pointer;
  display:flex; align-items:center; justify-content:center; transition:var(--transition); backdrop-filter:blur(10px);
  font-size:0.88rem; font-weight:var(--font-weight-medium); font-family:inherit;
}
.page-btn:hover:not(:disabled){ border-color:var(--primary); color:var(--text-primary); background:var(--primary-light); transform:translateY(-1px); }
/* active 用主色蓝 */
.page-btn.active{ background:var(--primary); border-color:var(--primary); color:#fff; box-shadow:0 2px 10px var(--primary-glow); font-weight:var(--font-weight-semibold); }
.page-btn:disabled{ opacity:0.35; cursor:not-allowed; }
.page-ellipsis{ color:var(--text-muted); padding:0 4px; font-size:0.85rem; font-weight:var(--font-weight-regular); }
[data-theme="dark"] .page-ellipsis{ color:var(--text-secondary); }

/* ============ Empty State ============ */
.empty-state{
  text-align:center; padding:70px 20px; color:var(--text-muted); grid-column:1/-1;
  background:var(--bg-card); border-radius:var(--radius); border:1px dashed var(--border); backdrop-filter:blur(10px);
}
.empty-state i{ opacity:0.4; margin-bottom:20px; font-size:3.5rem; }
.empty-state p{ font-size:1rem; margin-bottom:8px; font-weight:var(--font-weight-regular); }
.empty-state .empty-hint{ font-size:0.85rem; opacity:0.7; font-weight:var(--font-weight-regular); }

/* ============ Footer ============ */
.footer{
  position:relative; z-index:1; flex-shrink:0; width:calc(100% - var(--sidebar-width));
  margin-left:var(--sidebar-width); margin-top:auto; border-top:1px solid var(--border);
  background:var(--bg-glass); backdrop-filter:blur(20px); -webkit-backdrop-filter:blur(20px);
  box-shadow:var(--shadow); transition:margin-left 0.3s cubic-bezier(0.4,0,0.2,1), width 0.3s cubic-bezier(0.4,0,0.2,1);
}
body.sidebar-collapsed .footer{ margin-left:70px; width:calc(100% - 70px); }
.footer-inner{
  display:flex; align-items:center; justify-content:center; gap:20px;
  width:100%; max-width:1100px; margin:0 auto; padding:24px 30px; min-height:72px; text-align:center;
}
.footer-text{ color:var(--text-muted); margin:0; font-size:0.8rem; font-weight:var(--font-weight-regular); }

/* ============ Back to Top ============ */
/* 用主色蓝 */
.back-to-top{
  position:fixed; bottom:28px; right:28px; width:44px; height:44px; border-radius:50%;
  background:var(--primary); color:#fff; border:none; cursor:pointer; display:flex;
  align-items:center; justify-content:center; opacity:0; transform:translateY(10px);
  pointer-events:none; transition:var(--transition); z-index:90; box-shadow:0 4px 14px var(--primary-glow);
  font-size:1rem;
}
.back-to-top.show{ opacity:1; transform:translateY(0); pointer-events:all; }
.back-to-top:hover{ transform:translateY(-2px); box-shadow:0 6px 20px var(--primary-glow); }

/* ============ Toast ============ */
.toast-container{
  position:fixed; top:calc(var(--header-height) + 12px); right:20px; z-index:300;
  display:flex; flex-direction:column; gap:8px; pointer-events:none;
}
.toast{
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:12px 18px; display:flex; align-items:center; gap:10px; color:var(--text-primary);
  box-shadow:var(--shadow-hover); backdrop-filter:blur(20px); pointer-events:all;
  animation:toastIn 0.3s ease forwards; max-width:320px;
  font-size:0.88rem; font-weight:var(--font-weight-regular); font-family:inherit;
}
.toast.toast-out{ animation:toastOut 0.3s ease forwards; }
/* toast 图标 */
.toast i{ color:var(--text-primary); flex-shrink:0; font-size:1rem; }
/* success 用分类绿；error 用状态红 */
.toast.toast-success i{ color:var(--primary); }
.toast.toast-error   i{ color:var(--status-red); }

/* ============ Modal ============ */
.modal-overlay{
  display:none; position:fixed; inset:0; background:rgba(0,0,0,0.4);
  backdrop-filter:blur(4px); z-index:250; align-items:center; justify-content:center;
  padding:20px; opacity:0; transition:opacity 0.3s ease;
}
.modal-overlay.show{ display:flex; opacity:1; }
.modal{
  background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius);
  width:100%; max-width:420px; box-shadow:var(--shadow-hover); backdrop-filter:blur(20px);
  transform:scale(0.95); transition:transform 0.3s ease;
}
.modal-overlay.show .modal{ transform:scale(1); }
.modal-header{
  display:flex; align-items:center; justify-content:space-between;
  padding:18px 20px; border-bottom:1px solid var(--border);
}
.modal-header h3{ display:flex; align-items:center; gap:8px; color:var(--text-primary); font-size:1rem; font-weight:var(--font-weight-semibold); }
.modal-close{
  background:none; border:none; color:var(--text-muted); cursor:pointer; padding:4px;
  border-radius:6px; transition:var(--transition); width:30px; height:30px;
  display:flex; align-items:center; justify-content:center;
  font-size:1rem;
}
.modal-close:hover{ background:var(--primary-light); color:var(--primary); }
.modal-body{ padding:12px 20px 20px; }
.shortcut-item{
  display:flex; align-items:center; justify-content:space-between; padding:10px 0;
  border-bottom:1px solid var(--border); color:var(--text-secondary);
  font-size:0.88rem; font-weight:var(--font-weight-regular);
}
.shortcut-item:last-child{ border-bottom:none; }
kbd{
  display:inline-block; padding:3px 8px; background:var(--bg-primary); border:1px solid var(--border);
  border-radius:5px; box-shadow:0 1px 0 var(--border); color:var(--text-primary); min-width:24px; text-align:center;
  font-size:0.78rem; font-family:var(--font-mono);
}


/* ============ Responsive ============ */
@media(max-width:960px){ .header-center{ display:none; } .mobile-search-wrapper{ display:block; } }
@media(max-width:900px){
  .header-slogan{ display:none; }
  .menu-btn{ display:flex; }
  .header{ left:0; }
  .sidebar{ top:0; transform:translateX(-100%); z-index:200; }
  .sidebar.open{ transform:translateX(0); }
  .sidebar-header{ padding:16px 20px; }
  .sidebar-close{ display:block; background:none; border:none; color:var(--text-primary); cursor:pointer; padding:4px; font-size:1.1rem; }
  .sidebar-overlay{ display:none; position:fixed; inset:0; background:rgba(0,0,0,0.4); backdrop-filter:blur(2px); z-index:190; }
  .sidebar-overlay.show{ display:block; }
  main{ margin-left:0; max-width:100%; padding:calc(var(--header-height) + 24px) 16px 20px; }
  .footer{ width:100%; margin-left:0; }
  .footer-inner{ padding:14px 16px; }
  .link-list{ grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); }
}
@media(max-width:480px){
  main{ padding:calc(var(--header-height) + 20px) 12px 16px; }
  .link-list{ grid-template-columns:1fr; gap:12px; }
  .link-card{ padding:16px; }
  .link-icon{ width:44px; height:44px; border-radius:12px; font-size:1.15rem; }
  .back-to-top{ bottom:16px; right:16px; }
  .toast-container{ left:12px; right:12px; top:calc(var(--header-height) + 8px); }
  .toast{ max-width:100%; }
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar{ width:6px; }
::-webkit-scrollbar-track{ background:transparent; }
::-webkit-scrollbar-thumb{ background:var(--border); border-radius:3px; }
::-webkit-scrollbar-thumb:hover{ background:var(--text-muted); }

/* ============ Animations ============ */
@keyframes fadeIn     { from{ opacity:0; transform:translateY(8px); }  to{ opacity:1; transform:translateY(0); } }
@keyframes fadeInUp   { from{ opacity:0; transform:translateY(16px); } to{ opacity:1; transform:translateY(0); } }
@keyframes toastIn    { from{ opacity:0; transform:translateX(20px); } to{ opacity:1; transform:translateX(0); } }
@keyframes toastOut   { from{ opacity:1; transform:translateX(0); }   to{ opacity:0; transform:translateX(20px); } }
@keyframes pulse      { 0%,100%{ opacity:1; } 50%{ opacity:0.6; } }
@keyframes linkCardIn { from{ opacity:0; transform:translateY(12px) scale(0.98); } to{ opacity:1; transform:translateY(0) scale(1); } }
.link-card{ animation:linkCardIn 0.4s cubic-bezier(0.4,0,0.2,1) both; }


/* ============ Dark Mode Components ============ */
[data-theme="dark"] .header,
[data-theme="dark"] .sidebar,
[data-theme="dark"] .footer{
  background:var(--bg-glass);
  border-color:var(--border);
  box-shadow:0 1px 0 rgba(0,61,254,0.12), var(--shadow);
}

[data-theme="dark"] .search-box input,
[data-theme="dark"] .icon-btn,
[data-theme="dark"] .clock{
  background:rgba(8,15,12,0.55);
  border-color:var(--border);
}
[data-theme="dark"] .search-box input:focus{
  background:var(--bg-elevated);
  border-color:var(--border-strong);
}
[data-theme="dark"] .search-shortcut{
  background:var(--bg-elevated);
  border-color:var(--border);
}

[data-theme="dark"] .category-item{
  color:var(--text-primary);
}
[data-theme="dark"] .category-item:hover,
[data-theme="dark"] .category-item.active{
  background:rgba(0,61,254,0.12);
}
[data-theme="dark"] .category-item.active{
  border-left-color:var(--primary);
  box-shadow:inset 0 0 20px rgba(0,61,254,0.12);
}
[data-theme="dark"] .category-count{
  background:rgba(8,15,12,0.5);
  color:var(--text-secondary);
}

[data-theme="dark"] .quick-tag{
  background:var(--bg-elevated);
  border-color:var(--border-strong);
  color:var(--text-primary);
}
[data-theme="dark"] .quick-tag:hover{
  color:var(--text-primary);
  border-color:rgba(0,61,254,0.40);
  background:rgba(0,61,254,0.12);
}
[data-theme="dark"] .quick-tag.active{
  color:#fff;
  font-weight:var(--font-weight-semibold);
  box-shadow:0 2px 12px var(--primary-glow);
}

[data-theme="dark"] .link-card{
  background:linear-gradient(160deg, rgba(18,18,24,0.96) 0%, rgba(15,15,20,0.98) 100%);
  border-color:var(--border);
  box-shadow:0 2px 12px rgba(0,0,0,0.35), inset 0 1px 0 rgba(0,61,254,0.12);
}
[data-theme="dark"] .link-card:hover{
  border-color:rgba(0,61,254,0.35);
  background:linear-gradient(160deg, rgba(26,26,31,0.98) 0%, rgba(18,18,24,1) 100%);
}
[data-theme="dark"] .link-icon{
  background:rgba(0,61,254,0.15);
  box-shadow:0 2px 10px rgba(0,0,0,0.3), inset 0 1px 0 rgba(0,61,254,0.12);
}
[data-theme="dark"] .link-card:hover .link-icon::before{
  background:linear-gradient(135deg, var(--primary), var(--cat-cyan));
}
[data-theme="dark"] .link-arrow{
  background:rgba(8,15,12,0.6);
}

[data-theme="dark"] .page-btn{
  background:var(--bg-elevated);
  border-color:var(--border);
  color:var(--text-primary);
}
[data-theme="dark"] .page-btn.active{
  color:#ffffff;
  font-weight:var(--font-weight-bold);
}

[data-theme="dark"] .empty-state{
  background:var(--bg-elevated);
  border-color:var(--border);
}

[data-theme="dark"] .back-to-top{
  background:linear-gradient(135deg, var(--primary), var(--cat-cyan));
  box-shadow:0 4px 20px var(--primary-glow);
}
[data-theme="dark"] .back-to-top:hover{
  box-shadow:0 8px 28px var(--primary-glow);
}

[data-theme="dark"] .toast{
  background:var(--bg-elevated);
  border-color:var(--border-strong);
  box-shadow:var(--shadow-hover);
}

[data-theme="dark"] .modal-overlay{
  background:rgba(4,8,6,0.75);
  backdrop-filter:blur(8px);
}
[data-theme="dark"] .modal{
  background:linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg-card) 100%);
  border-color:var(--border-strong);
  box-shadow:0 24px 64px rgba(0,0,0,0.55), 0 0 0 1px rgba(0,61,254,0.12);
}
[data-theme="dark"] kbd{
  background:rgba(8,15,12,0.6);
  border-color:var(--border);
  box-shadow:0 1px 0 var(--border-strong);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb{
  background:rgba(0,61,254,0.25);
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover{
  background:rgba(0,61,254,0.38);
}