:root {
    color-scheme: light;
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-text: #1f2937;
    --color-muted: #6b7280;
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-border: #d1d5db;
    --color-success-bg: #ecfdf5;
    --color-success-text: #065f46;
    --color-error-bg: #fef2f2;
    --color-error-text: #991b1b;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
}

.container {
    max-width: 560px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.intro {
    color: var(--color-muted);
    margin-bottom: 1.5rem;
}

form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 600;
    font-size: 0.95rem;
    margin-top: 0.75rem;
}

select,
textarea {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--color-surface);
    color: var(--color-text);
}

textarea {
    resize: vertical;
}

select:focus,
textarea:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

button {
    margin-top: 1.25rem;
    padding: 0.75rem 1rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

button:hover {
    background: var(--color-primary-hover);
}

.alert {
    padding: 0.85rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success-text);
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
}

.alert-error ul {
    margin: 0;
    padding-left: 1.1rem;
}

.footnote {
    margin-top: 1.5rem;
    font-size: 0.85rem;
    color: var(--color-muted);
}

.privacy-note {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--color-muted);
}

.privacy-note a {
    color: inherit;
}

.site-footer {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    text-align: center;
}

.site-footer a {
    color: var(--color-muted);
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}

.site-footer span {
    margin: 0 0.5rem;
    color: var(--color-border);
}

.site-footer p {
    margin: 0.35rem 0;
}

.site-footer .credit {
    font-size: 0.8rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --color-bg: #111827;
        --color-surface: #1f2937;
        --color-text: #f3f4f6;
        --color-muted: #9ca3af;
        --color-border: #374151;
        --color-success-bg: #064e3b;
        --color-success-text: #d1fae5;
        --color-error-bg: #7f1d1d;
        --color-error-text: #fee2e2;
    }
}