*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#fafafa;--color-surface:#fff;--color-border:#e0e0e0;--color-text:#1a1a1a;--color-text-muted:#5a5a5a;--color-primary:#1a1a2e;--color-primary-hover:#16213e;--color-accent:#0f3460;--color-accent-light:#e8f0fe;--radius:8px;--max-width:960px;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace}html{-webkit-font-smoothing:antialiased;font-size:16px}body{font-family:var(--font-sans);background:var(--color-bg);color:var(--color-text);line-height:1.6}.container{max-width:var(--max-width);margin:0 auto;padding:0 24px}.navbar{border-bottom:1px solid var(--color-border);background:var(--color-surface);z-index:100;position:sticky;top:0}.nav-inner{justify-content:space-between;align-items:center;height:56px;display:flex}.logo{color:var(--color-text);align-items:center;gap:8px;font-size:1.1rem;font-weight:700;text-decoration:none;display:flex}.logo-icon{color:var(--color-accent);font-size:1.4rem}.nav-right{align-items:center;gap:16px;display:flex}.nav-link{color:var(--color-text-muted);font-size:.875rem;font-weight:500;text-decoration:none}.nav-link:hover{color:var(--color-text)}.lang-switch{position:relative}.lang-toggle{border:1px solid var(--color-border);border-radius:var(--radius);color:var(--color-text-muted);cursor:pointer;background:0 0;align-items:center;gap:4px;padding:4px 10px;font-family:inherit;font-size:.8125rem;font-weight:500;transition:border-color .15s,color .15s;display:inline-flex}.lang-toggle:hover{border-color:var(--color-text-muted);color:var(--color-text)}.lang-menu{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);z-index:200;min-width:140px;padding:4px 0;list-style:none;display:none;position:absolute;top:calc(100% + 6px);right:0;box-shadow:0 4px 16px #00000014}.lang-switch.open .lang-menu{display:block}.lang-menu a{color:var(--color-text-muted);padding:6px 14px;font-size:.8125rem;text-decoration:none;display:block}.lang-menu a:hover{background:var(--color-bg);color:var(--color-text)}.lang-menu a[aria-current=page]{color:var(--color-accent);font-weight:600}.hero{text-align:center;padding:80px 0 64px}.hero h1{letter-spacing:-.02em;color:var(--color-primary);font-size:clamp(2rem,5vw,3rem);font-weight:800;line-height:1.2}.hero h1 em{color:var(--color-accent);font-style:normal}.hero-sub{color:var(--color-text-muted);max-width:560px;margin-top:20px;margin-left:auto;margin-right:auto;font-size:1.125rem}.hero-actions{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:36px;display:flex}.hero-note{color:var(--color-text-muted);margin-top:16px;font-size:.8125rem}.btn{border-radius:var(--radius);cursor:pointer;border:1px solid #0000;align-items:center;gap:8px;padding:10px 20px;font-family:inherit;font-size:.9375rem;font-weight:600;transition:background .15s,border-color .15s,color .15s;display:inline-flex}.btn-icon{flex-shrink:0}.btn-primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn-primary:hover{background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.btn-secondary{background:var(--color-surface);color:var(--color-text);border-color:var(--color-border)}.btn-secondary:hover{background:var(--color-bg);border-color:var(--color-text-muted)}.btn-ghost{color:var(--color-text-muted);border-color:var(--color-border);background:0 0}.btn-ghost:hover{color:var(--color-text);border-color:var(--color-text-muted)}.btn:disabled{opacity:.5;cursor:not-allowed}.features{border-top:1px solid var(--color-border);padding:64px 0}.features h2{text-align:center;margin-bottom:40px;font-size:1.5rem;font-weight:700}.feature-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;display:grid}.feature-card{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);padding:24px}.feature-number{background:var(--color-accent-light);width:32px;height:32px;color:var(--color-accent);border-radius:50%;justify-content:center;align-items:center;margin-bottom:12px;font-size:.875rem;font-weight:700;display:flex}.feature-card h3{margin-bottom:8px;font-size:1rem;font-weight:600}.feature-card p{color:var(--color-text-muted);font-size:.875rem;line-height:1.5}.details{border-top:1px solid var(--color-border);text-align:center;padding:64px 0}.details h2{margin-bottom:16px;font-size:1.5rem;font-weight:700}.details>.container>p{max-width:620px;color:var(--color-text-muted);margin:0 auto 28px}.detail-list{text-align:left;flex-direction:column;gap:10px;list-style:none;display:inline-flex}.detail-list li{color:var(--color-text-muted);padding-left:24px;font-size:.9375rem;position:relative}.detail-list li:before{content:"";background:var(--color-accent);border-radius:50%;width:8px;height:8px;position:absolute;top:8px;left:0}.footer{border-top:1px solid var(--color-border);margin-top:0;padding:24px 0}.footer-inner{color:var(--color-text-muted);justify-content:space-between;align-items:center;font-size:.8125rem;display:flex}.footer-inner a{color:var(--color-text-muted);text-decoration:none}.footer-inner a:hover{color:var(--color-text)}.flash-dialog{border:1px solid var(--color-border);border-radius:12px;width:calc(100% - 48px);max-width:420px;padding:0;box-shadow:0 8px 32px #0000001f}.flash-dialog::backdrop{background:#0000004d}.dialog-content{padding:28px}.dialog-content h3{margin-bottom:8px;font-size:1.125rem}.dialog-content p{color:var(--color-text-muted);margin-bottom:20px;font-size:.875rem}.dialog-actions{justify-content:flex-end;gap:8px;display:flex}.dialog-status{border-radius:var(--radius);background:var(--color-accent-light);color:var(--color-accent);margin-bottom:16px;padding:10px 14px;font-size:.8125rem}.dialog-status.error{color:#991b1b;background:#fef2f2}.dialog-status.success{color:#166534;background:#f0fdf4}.dialog-progress{margin-top:16px}.progress-bar{background:var(--color-border);border-radius:3px;height:6px;overflow:hidden}.progress-bar:after{content:"";height:100%;width:var(--progress,0%);background:var(--color-accent);border-radius:3px;transition:width .2s;display:block}.progress-text{color:var(--color-text-muted);text-align:right;font-size:.75rem;font-family:var(--font-mono);margin-top:6px;display:block}@media (width<=600px){.hero{padding:48px 0 40px}.hero-actions{flex-direction:column;align-items:stretch}.btn{justify-content:center}}