:root {
    --primary-color: #6366f1;
    --secondary-color: #4f46e5;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-color: #64748b;
    --heading-color: #0f172a;
    --border-color: #e2e8f0;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    --sidebar-width: 260px;
}

body.dark-mode {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #94a3b8;
    --heading-color: #f1f5f9;
    --border-color: #334155;
}

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

body {
    font-family: 'Inter', 'Manrope', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

#particle-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: width 0.3s;
}

.sidebar.collapsed { width: 72px; }
.sidebar.collapsed span { display: none; }

.logo {
    padding: 1.5rem;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--heading-color);
    border-bottom: 1px solid var(--border-color);
}

.sidebar nav ul { list-style: none; padding: 1rem 0; }

.sidebar nav li {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-color);
    transition: all 0.2s;
}

.sidebar nav li:hover,
.sidebar nav li.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border-right: 3px solid var(--primary-color);
}

.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.top-bar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.search-bar {
    flex: 1;
    max-width: 480px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.5rem 1rem;
}

.search-bar input {
    border: none;
    background: transparent;
    flex: 1;
    outline: none;
    color: var(--heading-color);
}

#content-area {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

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

.header-actions h1 { color: var(--heading-color); font-size: 1.75rem; }

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card, .card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
}

.stat-card .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading-color);
}

.stat-card .stat-label { font-size: 0.85rem; margin-top: 0.25rem; }

.table-container { overflow-x: auto; }

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    color: var(--heading-color);
    font-weight: 600;
    background: var(--bg-color);
}

.btn, .btn-primary, .btn-secondary {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--heading-color);
    border: 1px solid var(--border-color);
}

.btn-icon {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 0.35rem;
}

.btn-icon.delete { color: var(--danger-color); }

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden { display: none; }

.modal-content {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    width: 90%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.35rem; font-weight: 500; color: var(--heading-color); }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--heading-color);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

.status-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.allotted { background: #dcfce7; color: #166534; }
.status-badge.applied { background: #fef3c7; color: #92400e; }
.status-badge.pending { background: #fef3c7; color: #92400e; }

#toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    color: var(--heading-color);
}

.toast.success { border-left: 4px solid var(--success-color); }
.toast.error { border-left: 4px solid var(--danger-color); }

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

.alert-card {
    border-left: 4px solid var(--warning-color);
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
}

.calendar-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.org-badge {
    font-size: 0.75rem;
    background: rgba(99,102,241,0.15);
    color: var(--primary-color);
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
}

@media (max-width: 768px) {
    .sidebar { position: fixed; z-index: 100; height: 100%; }
    .form-row { grid-template-columns: 1fr; }
}