:root {
    --bg: #f4f5f7;
    --card: #ffffff;
    --text: #1d2330;
    --muted: #5d6576;
    --border: #d5d9e0;
    --accent: #1f5fbf;
    --accent-text: #ffffff;
    --error: #b42318;
    --success-bg: #e8f5ec;
    --success-text: #1e5b33;
    --error-bg: #fdecea;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #12151b;
        --card: #1b2029;
        --text: #e7eaf0;
        --muted: #a2aab8;
        --border: #343b48;
        --accent: #5b93e8;
        --accent-text: #0d1117;
        --error: #f97066;
        --success-bg: #173322;
        --success-text: #a6e3b8;
        --error-bg: #3a1a17;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    background: var(--bg);
    color: var(--text);
    font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

main {
    width: 100%;
    max-width: 560px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px 28px;
}

.eyebrow {
    margin: 0 0 4px;
    color: var(--muted);
    font-size: 0.85rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

h1 {
    margin: 0 0 12px;
    font-size: clamp(1.6rem, 6vw, 2.3rem);
    line-height: 1.2;
    overflow-wrap: anywhere;
}

h1.neutral { font-size: 1.4rem; margin: 0; }

.lead { margin: 0 0 24px; color: var(--muted); }

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.field { display: flex; flex-direction: column; gap: 6px; }

label { font-weight: 600; font-size: 0.95rem; }

input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    font: inherit;
}

input:focus-visible, button:focus-visible, a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

input[aria-invalid="true"] { border-color: var(--error); }

.field-error { color: var(--error); font-size: 0.875rem; }

.hp {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.captcha { margin: 20px 0 16px; min-height: 78px; }

button {
    width: 100%;
    padding: 12px 16px;
    border: 0;
    border-radius: 8px;
    background: var(--accent);
    color: var(--accent-text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

button:hover { filter: brightness(1.08); }

.small { margin: 12px 0 0; color: var(--muted); font-size: 0.8rem; }

a { color: var(--accent); }

.notice { margin: 0 0 20px; padding: 12px 14px; border-radius: 8px; }
.notice.success { background: var(--success-bg); color: var(--success-text); margin: 0; }
.notice.error { background: var(--error-bg); color: var(--error); }

@media (max-width: 480px) {
    main { padding: 24px 18px; }
    .grid { grid-template-columns: 1fr; }
}