:root {
    color-scheme: light;
    --ink: #202124;
    --muted: #6b7280;
    --line: #e5e7eb;
    --surface: #ffffff;
    --accent: #d97706;
    --accent-dark: #92400e;
    --background: #f5f6f8;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    color: var(--ink);
    background: var(--background);
    font: 16px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell {
    width: min(100% - 32px, 960px);
    margin: 0 auto;
    padding: 48px 0;
}
.shell.narrow { width: min(100% - 32px, 520px); }
.topbar { display: flex; gap: 20px; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.eyebrow { margin: 0 0 4px; color: var(--accent-dark); font-size: .8rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
h1, h2 { margin-top: 0; line-height: 1.2; }
h1 { margin-bottom: 0; font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: 1.35rem; }
.card { padding: clamp(24px, 5vw, 44px); border: 1px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: 0 12px 36px rgb(15 23 42 / 7%); }
.card p { color: var(--muted); }
.notice { padding: 12px 14px; border-left: 4px solid var(--accent); background: #fff7ed; }
form { display: grid; gap: 10px; }
label { margin-top: 8px; font-weight: 700; }
input { width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; font: inherit; }
.button { display: inline-block; width: fit-content; margin-top: 16px; padding: 10px 16px; border: 0; border-radius: 10px; color: #fff; background: var(--accent); font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.button:hover { background: var(--accent-dark); }
.button-secondary { margin-top: 0; color: var(--ink); background: #f3f4f6; }
.button:disabled, input:disabled { cursor: not-allowed; opacity: .55; }
.back { display: inline-block; margin-top: 20px; color: var(--accent-dark); }
@media (max-width: 620px) { .topbar { align-items: flex-start; flex-direction: column; } }