:root{--bg: #f7f8fb;--bg-alt: #eef1f6;--surface: #ffffff;--surface-2: #f2f4f9;--border: rgba(15, 23, 42, .1);--text: #0f172a;--text-2: #52607a;--muted: #7c8aa5;--accent: #4f5df0;--accent-2: #8b5cf6;--accent-soft: rgba(79, 93, 240, .1);--shadow: 0 10px 30px -12px rgba(15, 23, 42, .18);--radius: 16px;--font: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;--mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace}[data-theme=dark]{--bg: #0b0f1a;--bg-alt: #0e1424;--surface: #131a2c;--surface-2: #1a2338;--border: rgba(148, 163, 184, .16);--text: #e8edf7;--text-2: #a3b1c9;--muted: #6b7a96;--accent: #7c8cff;--accent-2: #a78bfa;--accent-soft: rgba(124, 140, 255, .14);--shadow: 0 10px 34px -12px rgba(0, 0, 0, .55)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;scroll-padding-top:84px}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;transition:background .3s ease,color .3s ease}.container{max-width:1080px;margin:0 auto;padding:0 24px}.bg-glow{position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(600px 400px at 15% 0%,var(--accent-soft),transparent 70%),radial-gradient(700px 450px at 90% 10%,rgba(139,92,246,.1),transparent 70%)}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:color-mix(in srgb,var(--bg) 78%,transparent);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;gap:20px;height:64px}.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.1rem}.logo-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-size:.8rem;letter-spacing:.5px}.nav{display:flex;gap:26px;margin-left:auto}.nav a{color:var(--text-2);font-size:.95rem;font-weight:500;transition:color .2s}.nav a:hover{color:var(--accent)}.nav-item{position:relative}.nav-item>a:after{content:"\25be";font-size:.65em;color:var(--muted);margin-left:4px}.drop{position:absolute;top:100%;left:50%;transform:translate(-50%) translateY(8px);min-width:210px;max-width:320px;max-height:70vh;overflow-y:auto;padding:6px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow);opacity:0;visibility:hidden;transition:opacity .18s ease,transform .18s ease,visibility .18s}.nav-item:hover 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.2s}.tool-chip:hover{border-color:var(--accent);color:var(--accent)}.tool-chip.is-current{background:linear-gradient(135deg,var(--accent),var(--accent-2));border-color:transparent;color:#fff}.header-actions{display:flex;gap:8px;margin-left:8px}.nav+.header-actions{margin-left:0}.icon-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 10px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);font-size:.8rem;font-weight:600;transition:color .2s,border-color .2s,transform .15s}.icon-btn:hover{color:var(--accent);border-color:var(--accent)}.icon-btn:active{transform:scale(.95)}[data-theme=light] .icon-moon,[data-theme=dark] .icon-sun,.nav-toggle{display:none}.lang-wrap{position:relative}.lang-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:140px;padding:6px;background:var(--surface);border:1px solid 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var(--border);background:var(--surface);color:var(--text-2);font-size:.82rem;font-weight:600;margin-bottom:22px}.hero-title{font-size:clamp(2.1rem,5.5vw,3.4rem);font-weight:800;line-height:1.18;letter-spacing:-.02em}.gradient-text{background:linear-gradient(100deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}.hero-sub{max-width:560px;margin:18px auto 30px;color:var(--text-2);font-size:1.05rem}.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:12px;font-size:.95rem;font-weight:600;border:1px solid transparent;transition:transform .15s,box-shadow .2s,border-color .2s,background .2s}.btn:active{transform:translateY(1px)}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 8px 20px -8px var(--accent)}.btn-primary:hover{box-shadow:0 10px 26px -8px var(--accent);transform:translateY(-1px)}.btn-ghost{border-color:var(--border);background:var(--surface);color:var(--text)}.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}.btn-sm{padding:8px 16px;font-size:.85rem;border-radius:10px}.section{padding:72px 0}.section-alt{background:var(--bg-alt)}.section-head{text-align:center;margin-bottom:44px}.section-head h2,.section-head h1{font-size:clamp(1.5rem,3.5vw,2rem);font-weight:750;letter-spacing:-.01em}.section-head p{margin-top:8px;color:var(--text-2);max-width:520px;margin-left:auto;margin-right:auto}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.card{display:flex;flex-direction:column;gap:12px;padding:24px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .2s ease,border-color .2s ease}.card:hover{transform:translateY(-4px);border-color:var(--accent)}.card-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:12px;background:var(--accent-soft);color:var(--accent);font-size:1.2rem;font-weight:700}.card h3{font-size:1.08rem;font-weight:700}.card p{color:var(--text-2);font-size:.92rem;flex:1}.card-tags{display:flex;gap:8px;flex-wrap:wrap}.tag{padding:3px 10px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);color:var(--muted);font-size:.75rem;font-weight:600}.card-link{color:var(--accent);font-weight:600;font-size:.9rem;display:inline-flex;align-items:center;gap:4px}.card-link:hover{text-decoration:underline}.tool-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:28px;flex-wrap:wrap}.tool-tab{padding:9px 18px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text-2);font-size:.9rem;font-weight:600;transition:all .2s}.tool-tab.is-active{background:linear-gradient(135deg,var(--accent),var(--accent-2));border-color:transparent;color:#fff}.tool-panel{display:none}.tool-panel.is-active{display:block;animation:fadeIn .25s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.tool-two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}.tool-label{display:block;font-size:.85rem;font-weight:700;color:var(--text-2);margin-bottom:8px}.tool-textarea,.tool-pre{width:100%;min-height:220px;padding:14px;border-radius:12px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-family:var(--mono);font-size:.85rem;line-height:1.55;resize:vertical}.tool-textarea-sm{min-height:110px}.tool-textarea:focus,.tool-pre:focus{outline:2px solid var(--accent);outline-offset:-1px}.tool-pre{overflow:auto;white-space:pre}.tool-pre 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25%,transparent 75%,#ccc 75%),linear-gradient(45deg,#ccc 25%,transparent 25%,transparent 75%,#ccc 75%);background-size:12px 12px;background-position:0 0,6px 6px}.text-stats{color:var(--muted);font-size:.8rem;align-self:center}.diff-pre{max-height:420px}.diff-add{color:#16a34a}.diff-del{color:#ef4444}.diff-ctx{color:var(--muted)}.regex-count{color:var(--accent);font-weight:700;margin-bottom:10px;font-family:var(--font)}.regex-body{white-space:pre-wrap}.regex-body mark{background:#facc1573;color:inherit;border-radius:3px;padding:0 1px}[data-theme=dark] .regex-body mark{background:#facc154d}.qr-wrap{display:flex;justify-content:center;padding:20px 0 8px}.qr-wrap canvas{border:1px solid var(--border);border-radius:8px;image-rendering:pixelated}.qr-note{color:var(--muted);font-size:.8rem;margin-top:10px}.about-inner{max-width:640px;margin:0 auto;text-align:center}.about-inner h2{font-size:1.6rem;font-weight:750;margin-bottom:14px}.about-inner p{color:var(--text-2)}.site-footer{border-top:1px solid var(--border);padding:26px 0}.footer-inner{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.85rem}.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,16px);padding:10px 20px;border-radius:12px;background:var(--text);color:var(--bg);font-size:.88rem;font-weight:600;opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;z-index:100}.toast.show{opacity:1;transform:translate(-50%)}@media (max-width: 720px){.hero{padding:64px 0 48px}.section{padding:52px 0}.tool-two-col{grid-template-columns:1fr}.nav{position:absolute;top:64px;left:0;right:0;flex-direction:column;gap:0;background:var(--surface);border-bottom:1px solid var(--border);display:none;box-shadow:var(--shadow)}.nav.open{display:flex}.nav a{padding:14px 24px;border-top:1px solid var(--border)}.nav-toggle{display:inline-flex}.nav-item>a{display:flex}.drop{position:static;transform:none;min-width:0;box-shadow:none;border:none;border-radius:0;padding:0 0 6px;opacity:1;visibility:hidden;display:none}.nav-item:hover .drop,.nav-item:focus-within .drop{transform:none}.nav-item.open .drop{display:block;visibility:visible;opacity:1}.drop a{padding:10px 24px 10px 40px;color:var(--muted)}.drop a:hover{background:transparent}}.jwt-section{margin-top:18px}.jwt-pre{max-height:320px;min-height:0}.ai-notice{padding:12px 16px;border-radius:10px;margin-bottom:24px;background:#facc1526;border:1px solid rgba(234,179,8,.5);color:var(--text);font-size:.88rem;line-height:1.6}.ai-card p{color:var(--text-2);font-size:.9rem}