:root{--bg: #ffffff;--text: #111827;--muted: #5b6574;--accent: #0ea5e9;--card: #f8fafc;--border: #e2e8f0;--header-h: 64px;--radius: 10px;--font-display: "Instrument Serif", Georgia, "Times New Roman", serif;--page-glow: color-mix(in lab, var(--accent) 10%, transparent);--header-bg: color-mix(in srgb, var(--bg) 88%, transparent)}:root[data-theme=dark]{--bg: #0b0f14;--text: #e8edf4;--muted: #94a3b8;--accent: #22d3ee;--card: #121a24;--border: #243044;--page-glow: color-mix(in lab, var(--accent) 6%, transparent);--header-bg: color-mix(in srgb, var(--bg) 90%, transparent)}*{box-sizing:border-box}html,body{height:100%}body{margin:0;background-color:var(--bg);background-image:radial-gradient(ellipse 90% 55% at 50% -18%,var(--page-glow),transparent 68%);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,Arial,"Apple Color Emoji","Segoe UI Emoji";line-height:1.65;display:flex;flex-direction:column}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:720px;padding:1.25rem;margin:0 auto;width:100%}.main-container{flex:1;display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-h));padding:1rem 0 2rem}.header{position:sticky;top:0;z-index:100;width:100%;min-height:var(--header-h);border-bottom:1px solid var(--border);background-color:var(--header-bg);backdrop-filter:blur(12px) saturate(1.05);-webkit-backdrop-filter:blur(12px) saturate(1.05);isolation:isolate}.header:before{content:"";position:absolute;inset:0;z-index:-1;background-color:var(--bg);background-image:radial-gradient(ellipse 100% 120% at 50% -80%,var(--page-glow),transparent 72%);pointer-events:none}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:var(--header-h);padding-top:.875rem;padding-bottom:.875rem}.brand{font-weight:600;font-size:.9375rem;color:var(--text);letter-spacing:.01em;text-decoration:none;transition:color .18s ease}.brand:hover{color:var(--accent);text-decoration:none}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:1.75rem 1.5rem;box-shadow:0 1px 2px #0f172a0a}:root[data-theme=dark] .card{box-shadow:0 1px #ffffff0a inset}.icon-button{display:inline-flex;align-items:center;justify-content:center;height:36px;width:36px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.icon-button:hover{border-color:color-mix(in lab,var(--accent) 35%,var(--border));transform:translateY(-1px);box-shadow:0 4px 14px #0f172a0f}:root[data-theme=dark] .icon-button:hover{box-shadow:0 4px 14px #00000040}.icon-button:focus-visible{outline:none;box-shadow:0 0 0 3px color-mix(in lab,var(--accent) 28%,transparent)}.footer{padding:1rem 0 1.5rem;color:var(--muted);font-size:.8125rem;text-align:center;letter-spacing:.01em}@media (prefers-reduced-motion: reduce){*{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}