:root {
    color-scheme: light;
    --bg: #f7f7f9;
    --card-bg: #ffffff;
    --border: #dcdce2;
    --text: #1f1f28;
    --muted: #6b6b76;
    --brand: #8c1515; /* CMU cardinal red */
    --brand-dark: #6e1010;
    --success-bg: #e6f4ea;
    --success-text: #1e6b34;
    --error-bg: #fbeaea;
    --error-text: #9c1c1c;
}

* { box-sizing: border-box; }

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

.page {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 16px 64px;
}

.page-wide {
    max-width: 1200px;
}

.site-header h1 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.site-header h1 a {
    color: var(--brand);
    text-decoration: none;
}

.site-header h1 a:hover {
    text-decoration: underline;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin-bottom: 24px;
}

.card-narrow {
    max-width: 360px;
}

.card-medium {
    max-width: 480px;
}

.edit-code {
    font-family: "SF Mono", Consolas, Menlo, monospace;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 14px;
    text-align: center;
    color: var(--brand);
    margin: 8px 0;
}

h2 {
    margin-top: 0;
    font-size: 1.2rem;
}

h3 {
    margin: 0;
    font-size: 1.05rem;
}

label {
    display: block;
    font-weight: 600;
    margin-top: 14px;
    margin-bottom: 4px;
    font-size: 0.9rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    background: #fff;
    color: var(--text);
}

.hint {
    color: var(--muted);
    font-size: 0.85rem;
    margin: 4px 0 0;
}

button {
    background: var(--brand);
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 9px 16px;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 14px;
}

button:hover { background: var(--brand-dark); }

.btn-danger { background: #b3261e; }
.btn-danger:hover { background: #8c1e18; }
.btn-small { padding: 5px 10px; font-size: 0.8rem; margin-top: 0; }

.alert {
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
    font-size: 0.95rem;
}
.alert ul { margin: 0; padding-left: 20px; }
.alert-success { background: var(--success-bg); color: var(--success-text); }
.alert-error { background: var(--error-bg); color: var(--error-text); }

.nav-links { margin-top: 24px; }
.nav-links a { color: var(--brand); }

.admin-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: var(--muted);
}
.admin-bar a { color: var(--brand); }

.inline-form {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin: 8px 12px 8px 0;
    max-width: 100%;
}
.inline-form label { margin: 0; font-weight: 500; }
.inline-form input { width: auto; }
.inline-form button { margin-top: 0; }

.date-block {
    border-top: 1px solid var(--border);
    padding: 16px 0;
}
.date-block:first-of-type { border-top: none; padding-top: 0; }

.date-block-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.slot-count {
    margin-left: auto;
    font-size: 0.85rem;
    color: var(--muted);
}

.signup-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.signup-table th, .signup-table td {
    text-align: left;
    padding: 6px 8px;
    border-bottom: 1px solid var(--border);
}

.signup-table code {
    font-family: "SF Mono", Consolas, Menlo, monospace;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 5px;
    letter-spacing: 0.05em;
}