:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #58636d;
  --paper: #f6f7f4;
  --panel: #ffffff;
  --line: #cdd5d4;
  --accent: #a7262b;
  --accent-dark: #68191d;
  --gold: #c89b3c;
  --focus: #1e6f8f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(167, 38, 43, .12), transparent 38%),
    linear-gradient(315deg, rgba(30, 111, 143, .12), transparent 40%),
    var(--paper);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0;
}

.narrow { width: min(760px, calc(100% - 32px)); }

.panel,
.notice-panel {
  background: rgba(255, 255, 255, .94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(23, 32, 38, .12);
}

.panel { padding: clamp(24px, 4vw, 40px); }
.notice-panel { padding: 18px 22px; margin: 20px 0; }
.hero-panel { display: flex; align-items: center; gap: 26px; margin-bottom: 22px; }
.form-panel { margin-top: 22px; }

.brand-title,
.page-title {
  margin: 0 0 14px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

.lead-text,
.notice-text { color: var(--muted); font-size: 1.08rem; margin: 0; }
.warning-block {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border-left: 5px solid var(--accent);
  background: #fff8f2;
  color: #271b16;
  padding: 16px;
  margin: 18px 0 24px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9rem;
}

.form-grid {
  display: grid;
  gap: 12px;
}

.field-label { font-weight: 700; color: #26343d; }
.text-field {
  width: 100%;
  border: 1px solid #aab7ba;
  border-radius: 6px;
  padding: 12px 14px;
  min-height: 46px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.text-field:focus {
  outline: 3px solid rgba(30, 111, 143, .24);
  border-color: var(--focus);
}

.text-area { resize: vertical; min-height: 120px; }
.tall-area { min-height: 220px; }

.primary-button {
  justify-self: start;
  border: 0;
  border-radius: 6px;
  padding: 12px 18px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  cursor: pointer;
}

.primary-button:hover { background: var(--accent-dark); }
.error-text { color: #b00020; margin: 0 0 14px; }
.error-panel { border-color: rgba(176, 0, 32, .35); background: #fff6f7; }

.gate-mark {
  flex: 0 0 180px;
  width: 180px;
  max-width: 32vw;
}

.gate-mark svg { width: 100%; height: auto; display: block; }
.mark-outline { fill: none; stroke: var(--accent); stroke-width: 8; stroke-linejoin: round; }
.mark-fill { fill: var(--gold); stroke: var(--ink); stroke-width: 3; }
.mark-dot { fill: var(--accent-dark); }
.key-readout {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 6px;
  background: #172026;
  color: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
}

@media (max-width: 640px) {
  .shell { padding: 20px 0; }
  .hero-panel { align-items: flex-start; flex-direction: column; }
  .gate-mark { max-width: 180px; }
  .primary-button { width: 100%; }
}