:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #5d6975;
  --line: #d8dee6;
  --primary: #0f766e;
  --primary-dark: #0b5f59;
  --danger: #b42318;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--primary); text-decoration: none; }
.shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; padding: 24px 0 48px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
.brand { color: var(--text); font-weight: 700; }
nav { display: flex; gap: 14px; flex-wrap: wrap; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 24px; box-shadow: 0 1px 2px rgba(16, 24, 40, .05); }
.hero { padding: 36px 28px; }
h1 { margin: 0 0 12px; font-size: 28px; letter-spacing: 0; }
p { color: var(--muted); line-height: 1.5; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.button, button { border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--text); padding: 10px 14px; font: inherit; cursor: pointer; }
.primary, .button.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.primary:hover, .button.primary:hover { background: var(--primary-dark); }
.form { display: grid; gap: 16px; margin-top: 18px; }
label { display: grid; gap: 6px; font-weight: 600; }
input, textarea, select { width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 10px 12px; font: inherit; background: #fff; }
textarea { resize: vertical; }
.notice { border: 1px solid #7dd3fc; background: #effaff; color: #075985; padding: 12px; border-radius: 6px; }
.error { border: 1px solid #fda29b; background: #fff1f0; color: var(--danger); padding: 12px; border-radius: 6px; white-space: pre-wrap; }
@media (max-width: 640px) { .topbar { align-items: flex-start; flex-direction: column; } .panel { padding: 18px; } }