:root {
  color-scheme: light dark;
  --bg: #edf2f7;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #dbe3ec;
  --warning: #d97706;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111827; --card: #1f2937; --text: #f8fafc; --muted: #a8b4c5; --accent: #60a5fa; --accent-hover: #93c5fd; --border: #475569; --warning: #f59e0b; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 1.5rem; background: radial-gradient(circle at top, color-mix(in srgb, var(--accent) 12%, var(--bg)), var(--bg) 45%); color: var(--text); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif; }
.card { width: min(760px, 100%); padding: clamp(1.5rem, 5vw, 3.5rem); background: var(--card); border: 1px solid var(--border); border-radius: 18px; box-shadow: 0 18px 50px rgb(15 23 42 / 18%); }
.mark { display: grid; place-items: center; width: 3rem; height: 3rem; border-radius: 50%; background: var(--accent); color: white; font-size: 1.55rem; font-weight: 700; }
.mark.warning { background: var(--warning); }
.eyebrow { margin: 1.2rem 0 .25rem; color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .09em; text-transform: uppercase; }
h1 { margin: 0 0 1.8rem; font-size: clamp(1.65rem, 4vw, 2.35rem); line-height: 1.15; }
.label, form label { display: block; margin: 1.15rem 0 .35rem; color: var(--muted); font-size: .86rem; font-weight: 650; }
.url { overflow-wrap: anywhere; }
.old { padding: .8rem 1rem; border: 1px solid var(--border); border-radius: 8px; background: color-mix(in srgb, var(--muted) 8%, transparent); }
.target { display: block; padding: 1rem; border-radius: 8px; background: color-mix(in srgb, var(--accent) 13%, transparent); color: var(--accent); font-weight: 700; overflow-wrap: anywhere; text-decoration-thickness: 2px; }
.target:hover { color: var(--accent-hover); }
.countdown { margin: 1.5rem 0 0; color: var(--muted); }
.search-row { display: flex; gap: .65rem; }
input, button { min-height: 2.9rem; border-radius: 8px; font: inherit; }
input { flex: 1; min-width: 0; padding: .6rem .8rem; border: 1px solid var(--border); background: var(--card); color: var(--text); }
button { padding: .6rem 1rem; border: 0; background: var(--accent); color: white; cursor: pointer; font-weight: 700; }
button:hover { background: var(--accent-hover); }
@media (max-width: 580px) { .search-row { flex-direction: column; } }