:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --header-bg: #ffffff;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --primary-color: #3b82f6;
    --accent-color: #10b981;
    --muted-text: #64748b;
    --transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --text-color: #f1f5f9;
        --header-bg: #1e293b;
        --card-bg: #1e293b;
        --card-border: #334155;
        --muted-text: #94a3b8;
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    transition: var(--transition);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 1rem;
}

header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--card-border);
    padding: 1rem 0;
    margin-bottom: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

.metric {
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--primary-color);
    color: white;
    margin-left: 0.5rem;
}

.badge-error {
    background-color: #ef4444;
}


/* Hierarchy / Accordion */
.hierarchy-child {
    margin-left: 1.5rem;
    border-left: 2px solid var(--card-border);
    padding-left: 1rem;
    display: none;
}

.expanded .hierarchy-child {
    display: block;
}

/* Buttons and Actions */
.actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    color: inherit;
    background-color: var(--card-border);
}

.btn-call {
    background-color: #10b981;
    color: white;
}

.btn-map {
    background-color: #3b82f6;
    color: white;
}

/* Student Row */
.student-row {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--card-border);
    padding: 0.75rem;
    cursor: pointer;
}

.student-row-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.student-details {
    padding-top: 0.75rem;
    display: none;
    font-size: 0.875rem;
    color: var(--muted-text);
}

.student-row.expanded .student-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.hidden {
    display: none;
}