:root {
  color-scheme: dark;
  --bg: #0b1020;
  --panel: rgba(18, 26, 47, 0.88);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary: rgba(255, 255, 255, 0.08);
  --success-bg: rgba(22, 163, 74, 0.16);
  --success-border: rgba(34, 197, 94, 0.35);
  --error-bg: rgba(220, 38, 38, 0.14);
  --error-border: rgba(248, 113, 113, 0.35);
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.35);
  --radius: 24px;
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, rgba(99, 102, 241, 0.24), transparent 32%), linear-gradient(180deg, #020617, var(--bg));
  color: var(--text);
}
.container { width: min(100%, 820px); margin: 0 auto; padding: 48px 20px; }
.card {
  background: var(--panel); border: 1px solid var(--panel-border); border-radius: var(--radius); box-shadow: var(--shadow); backdrop-filter: blur(18px); padding: 32px;
}
.card.compact { max-width: 640px; }
.eyebrow { color: #c7d2fe; text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.8rem; margin-bottom: 14px; }
h1 { margin: 0 0 14px; font-size: clamp(2rem, 3vw, 2.8rem); line-height: 1.1; }
.lead { margin: 0 0 28px; color: var(--muted); line-height: 1.6; }
.stack { display: grid; gap: 20px; }
.field { display: grid; gap: 8px; }
.field span { font-weight: 600; }
.field small { font-weight: 400; color: var(--muted); }
input[type="text"], textarea, #result-link {
  width: 100%; border-radius: 16px; border: 1px solid rgba(255,255,255,0.12); background: rgba(15, 23, 42, 0.95); color: var(--text); padding: 14px 16px; font: inherit; outline: none;
}
input[type="text"]:focus, textarea:focus, #result-link:focus { border-color: rgba(129, 140, 248, 0.9); box-shadow: 0 0 0 4px rgba(99,102,241,0.18); }
textarea { resize: vertical; min-height: 220px; }
.btn {
  appearance: none; border: 0; border-radius: 16px; background: var(--primary); color: white; font: inherit; font-weight: 700; padding: 14px 18px; cursor: pointer; transition: transform 0.15s ease, background-color 0.15s ease, opacity 0.15s ease; text-decoration:none; display:inline-flex; align-items:center; justify-content:center;
}
.btn:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn:disabled { opacity: 0.7; cursor: wait; transform: none; }
.btn.secondary { background: var(--secondary); }
.btn.secondary:hover { background: rgba(255,255,255,0.14); }
.result, .alert, .message-box, .meta { border-radius: 18px; padding: 18px; border: 1px solid rgba(255,255,255,0.1); }
.result, .message-box, .meta { background: rgba(15, 23, 42, 0.72); }
.result-head, .meta-label { color: #cbd5e1; font-size: 0.92rem; margin-bottom: 10px; }
.copy-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.hint { margin: 12px 0 0; color: var(--muted); line-height: 1.5; }
.alert { margin-top: 18px; }
.alert.error { background: var(--error-bg); border-color: var(--error-border); }
.alert.success { background: var(--success-bg); border-color: var(--success-border); }
.message-box { margin-top: 22px; }
.meta { margin-bottom: 22px; }
.meta-value { white-space: pre-wrap; word-break: break-word; }
pre { margin: 0; white-space: pre-wrap; word-break: break-word; font-family: inherit; line-height: 1.7; }
.hidden { display: none !important; }
@media (max-width: 640px) { .card { padding: 24px; } .copy-row { grid-template-columns: 1fr; } }