:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary: #64748b;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --sidebar-width: 260px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f1f5f9;
    color: #334155;
}

.wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-light) 100%);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header .brand {
    color: #fff;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-header .brand i {
    font-size: 1.5rem;
    color: var(--primary);
}

.sidebar-nav {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
    overflow-y: auto;
}

.nav-header {
    padding: 1rem 1.5rem 0.5rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
}

.nav-item {
    margin: 0.25rem 0.75rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: #94a3b8;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.nav-link:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}

.nav-link.active {
    background: var(--primary);
    color: #fff;
}

.nav-link i {
    font-size: 1.1rem;
}

.nav-link .badge {
    margin-left: auto;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #94a3b8;
    font-size: 0.875rem;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 2rem;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--dark);
}

.card {
    background: #fff;
    border: none;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid #e2e8f0;
    padding: 1rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.stat-card {
    padding: 1.5rem;
    border-radius: 0.75rem;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-card .stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
}

.stat-card .stat-label {
    color: var(--secondary);
    font-size: 0.875rem;
}

.table {
    margin-bottom: 0;
}

.table th {
    background: #f8fafc;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    border-bottom: 2px solid #e2e8f0;
}

.table td {
    vertical-align: middle;
    padding: 1rem;
}

.badge {
    padding: 0.35rem 0.65rem;
    font-weight: 500;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.alert-dismissible {
    margin-bottom: 1.5rem;
}

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-light) 100%);
}

.login-box {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 25px 50px rgba(0,0,0,0.25);
}

.login-box .logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-box .logo i {
    font-size: 3rem;
    color: var(--primary);
}

.login-box h1 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

.login-box p {
    text-align: center;
    color: var(--secondary);
    margin-bottom: 2rem;
}

.form-label {
    font-weight: 500;
    color: var(--dark);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.appointment-detail .detail-row {
    display: flex;
    padding: 0.75rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.appointment-detail .detail-label {
    width: 150px;
    font-weight: 500;
    color: var(--secondary);
}

.appointment-detail .detail-value {
    flex: 1;
    color: var(--dark);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.5rem;
}

.calendar-day {
    min-height: 100px;
    padding: 0.5rem;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
}

.calendar-day.today {
    border-color: var(--primary);
    background: rgba(14, 165, 233, 0.05);
}

.calendar-day.other-month {
    background: #f8fafc;
    color: #94a3b8;
}

.calendar-day .day-number {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.calendar-event {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    margin-bottom: 0.25rem;
    background: var(--primary);
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.calendar-event.pending {
    background: var(--warning);
    color: #000;
}

.calendar-event.confirmed {
    background: var(--success);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .main-content {
        margin-left: 0;
    }
}