:root {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --border: #dfe3ee;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2457ff;
    --primary-hover: #1c47d1;
    --success-bg: #e8f6ed;
    --success-text: #1b6e38;
    --danger-bg: #fce8ec;
    --danger-text: #b00020;
}

* {
    box-sizing: border-box;
}

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

.page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px;
}

.top-nav {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: #1f4bcc;
    font-weight: 600;
}

.signout-btn {
    border: 1px solid #cfd7ea;
    border-radius: 8px;
    background: #ffffff;
    color: #1f2937;
    padding: 8px 12px;
    font-weight: 600;
    cursor: pointer;
}

.signout-btn:hover {
    background: #f5f8ff;
}

h1 {
    margin: 0 0 8px;
    font-size: 1.9rem;
}

.subtitle {
    margin: 0;
    color: var(--muted);
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

.muted {
    color: var(--muted);
}

.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 8px;
}

button {
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 10px 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
}

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

button:disabled {
    background: #b8c2d9;
    cursor: not-allowed;
}

input[type="text"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
}

.status {
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    background: var(--success-bg);
    color: var(--success-text);
}

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

@media (max-width: 720px) {
    .page {
        padding: 16px;
    }
}