:root {
    /* Primary Palette - Peaceful Medical Blue & Teal */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;

    /* Secondary Palette - Energetic Action */
    --secondary-500: #10b981; /* Emerald */
    --secondary-600: #059669;

    /* Neutrals */
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --white: #ffffff;

    /* Status Colors */
    --red-600: #dc2626;
    --amber-500: #f59e0b;
    --green-500: #22c55e;

    /* Shadows & Glass */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: 1px solid rgba(255, 255, 255, 0.5);

    /* Sidebar */
    --sidebar-width: 260px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--slate-50);
    color: var(--slate-800);
    line-height: 1.5;
    margin: 0;
}

/* ========== Layout ========== */
.layout-container {
    display: flex;
    min-height: 100vh;
    background-color: var(--slate-50);
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--white);
    border-right: 1px solid var(--slate-200);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 50;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--slate-100);
    text-align: center;
}

.sidebar-logo {
    height: 120px;
    margin-bottom: 0.5rem;
}

.sidebar-version {
    color: var(--slate-400);
    font-size: 0.75rem;
    margin: 0;
}

.sidebar-nav {
    flex: 1;
    padding-top: 1rem;
    overflow-y: auto;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--slate-100);
}

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

/* ========== Navigation ========== */
.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--slate-600);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--primary-50);
    color: var(--primary-700);
    border-left-color: var(--primary-600);
}

.nav-section-label {
    margin-top: 1rem;
    padding-left: 1.5rem;
    color: var(--slate-400);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.nav-logout-btn {
    width: 100%;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--red-600);
}

/* Icons */
.nav-icon {
    margin-right: 0.75rem;
    font-size: 1.5rem;
}

.icon {
    font-size: 2rem;
}

.product-card .icon {
    font-size: 3rem;
}

/* ========== Cards ========== */
.card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--slate-100);
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
    text-decoration: none;
    border: none;
}

.btn-primary {
    background-color: var(--primary-600);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-700);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-700);
    border: 1px solid var(--primary-100);
}

.btn-secondary:hover {
    background-color: var(--primary-50);
}

.btn-danger {
    background-color: var(--red-600);
    color: var(--white);
}

.btn-danger:hover {
    opacity: 0.9;
}

/* ========== Forms ========== */
.input-group {
    margin-bottom: 1rem;
}

.label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--slate-800);
}

.input {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--slate-100);
    background-color: var(--slate-50);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
    box-sizing: border-box;
}

.input:focus {
    outline: none;
    border-color: var(--primary-500);
    background-color: var(--white);
    box-shadow: 0 0 0 3px var(--primary-100);
}

/* ========== Header ========== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--slate-100);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

/* ========== Badges ========== */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-success {
    background-color: #dcfce7;
    color: #166534;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

/* ========== Alerts ========== */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* ========== Tables ========== */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th {
    background: var(--slate-50);
    padding: 0.75rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--slate-500);
    border-bottom: 2px solid var(--slate-200);
}

.table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--slate-100);
}

.table tbody tr:hover {
    background-color: var(--slate-50);
}

/* ========== Grid ========== */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========== Utilities ========== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--slate-500); }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-primary { color: var(--primary-700); }
.font-bold { font-weight: 700; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.p-2 { padding: 1rem; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }

    .main-content {
        margin-left: 0;
    }
}