:root{--bg: #f4f6fb;--bg-card: #ffffff;--bg-card-hover: #eef2f9;--bg-input: #ffffff;--bg-sidebar: #eef2f8;--primary: #2563eb;--primary-strong: #1d4ed8;--primary-light: #3b82f6;--primary-dim: rgba(37, 99, 235, .1);--primary-glow: rgba(37, 99, 235, .22);--accent: #0891b2;--accent-dim: rgba(8, 145, 178, .1);--success: #059669;--danger: #dc2626;--text: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--border: rgba(15, 23, 42, .08);--border-light: rgba(15, 23, 42, .14);--surface: rgba(15, 23, 42, .03);--grad-primary: linear-gradient(135deg, var(--primary-light), var(--primary));--grad-primary-strong: linear-gradient(135deg, var(--primary), var(--primary-strong));--radius-sm: 8px;--radius: 12px;--radius-lg: 16px;--radius-pill: 999px;--transition: .22s cubic-bezier(.4, 0, .2, 1);--shadow-sm: 0 1px 3px rgba(15, 23, 42, .06);--shadow-card: 0 2px 8px rgba(15, 23, 42, .06), 0 4px 16px rgba(15, 23, 42, .04);--shadow-lg: 0 8px 32px rgba(15, 23, 42, .1);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;--grid-cols: 3;--grid-gap: 10px;--container-padding: 1rem;--container-max: 480px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;line-height:1.5;min-height:100vh}a{text-decoration:none;color:inherit}::-webkit-scrollbar{width:0;height:0;display:none}:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:2px}@media (prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.section-title{display:flex;align-items:center;gap:8px;font-size:.9rem;font-weight:700;color:var(--text)}.section-title:before{content:"";width:3px;height:14px;border-radius:2px;background:var(--grad-primary);box-shadow:0 0 8px var(--primary-glow)}.spinner{width:34px;height:34px;border-radius:50%;border:3px solid var(--primary-dim);border-top-color:var(--primary);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@keyframes sk{0%{background-position:200% 0}to{background-position:-200% 0}}.skeleton-img,.skeleton-text{background:linear-gradient(100deg,var(--surface) 30%,var(--bg-card-hover) 50%,var(--surface) 70%);background-size:200% 100%;animation:sk 1.2s infinite;border-radius:12px}.skeleton-img{width:100%;aspect-ratio:2/3}.skeleton-text{height:12px;margin:0 3px}.sk-card{display:flex;flex-direction:column;gap:8px}.nav-page-title{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--radius-pill);background:var(--primary-dim);color:var(--primary-strong);font-size:13px;font-weight:700;border:1px solid var(--primary-glow);white-space:nowrap;max-width:240px;overflow:hidden;text-overflow:ellipsis}@media (max-width: 560px){.nav-page-title{max-width:130px;font-size:12px;padding:5px 10px}}@media (max-width: 420px){.nav-page-title{display:none}}.back-to-top{position:fixed;right:16px;bottom:22px;width:44px;height:44px;border:none;border-radius:50%;background:var(--grad-primary);color:#fff;font-size:18px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:150;box-shadow:0 6px 20px #2563eb59;opacity:0;visibility:hidden;transform:translateY(16px);transition:opacity var(--transition),transform var(--transition),visibility var(--transition)}.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:active{transform:scale(.92)}@media (max-width: 420px){.back-to-top{right:12px;bottom:18px;width:40px;height:40px;font-size:16px}}