:root {
    --bg: #f5f5f7;
    --card-bg: #ffffff;
    --text: #111;
    --muted: #666;
    --accent: #0f8bff;
    --danger: #d7263d;
    --success: #1a936f;
    --border: #e0e0e0;
    font-size: 16px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    padding: 1.5rem;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    margin: 0;
    font-size: 2rem;
}

.page-header p {
    margin: 0.25rem 0 0;
    color: var(--muted);
}

.btn {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 999px;
    padding: 0.65rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(15, 139, 255, 0.2);
}

.btn-small {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
}

.summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 10px 25px rgba(50, 50, 93, 0.08);
}

.summary-card .value {
    font-size: 2rem;
    margin: 0.25rem 0;
}

.summary-card .sub {
    margin: 0;
    color: var(--muted);
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.cards.metrics {
    margin-top: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 1.25rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border: 1px solid transparent;
    position: relative;
}

.card[data-status="error"] {
    border-color: rgba(215, 38, 61, 0.3);
}

.card-header {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.card-header img {
    width: 48px;
    height: 48px;
}

.card-header h3 {
    margin: 0;
}

.card-header p {
    margin: 0.15rem 0 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.card-header a {
    color: var(--accent);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.85rem;
}

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

.card dl {
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.75rem;
}

.card dl div {
    background: #f7f8fa;
    padding: 0.75rem;
    border-radius: 0.75rem;
}

.card dt {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 0.25rem;
}

.card dd {
    margin: 0;
    font-weight: 600;
}

.card-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-actions a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

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

.card.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: rgba(255, 255, 255, 0.6);
    animation: shimmer 1.2s infinite;
}

@keyframes shimmer {
    0% {
        opacity: 0.3;
    }
    50% {
        opacity: 0.8;
    }
    100% {
        opacity: 0.3;
    }
}

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    .card dl {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}