/* assets/css/style.css */
:root {
    /* Colors */
    --primary-color: #4f46e5; /* Indigo */
    --primary-hover: #4338ca;
    --bg-color: #f3f4f6; /* Light gray */
    --surface-color: #ffffff;
    --text-color: #1f2937; /* Dark gray */
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
    
    /* Variables for Shadows and radius */
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #111827;
    --surface-color: #1f2937;
    --text-color: #f9fafb;
    --text-muted: #9ca3af;
    --border-color: #374151;
}

[data-theme="sepia"] {
    --primary-color: #d97706;
    --primary-hover: #b45309;
    --bg-color: #fdf6e3;
    --surface-color: #f4e8d3;
    --text-color: #433422;
    --text-muted: #78644e;
    --border-color: #dccba9;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, color 0.3s;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-hover);
}

/* Layout Classes */
.wrapper {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 260px;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s, border-color 0.3s;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-links {
    list-style: none;
    padding: 10px 0;
}

.nav-links li a {
    display: block;
    padding: 12px 20px;
    color: var(--text-color);
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.nav-links li a:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
}

.nav-group-title {
    padding: 12px 20px;
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s, color 0.2s;
}

.nav-group-title:hover {
    background-color: var(--bg-color);
}

.chevron {
    transition: transform 0.2s ease;
}

.nav-submenu {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background-color: var(--bg-color);
}

.nav-submenu li a {
    padding: 10px 20px 10px 40px;
    font-size: 0.9em;
}

.nav-group.active .nav-submenu {
    max-height: 200px;
}

.nav-group.active .chevron {
    transform: rotate(180deg);
}

.main-content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
    transition: background-color 0.3s;
}

.topbar {
    background-color: var(--surface-color);
    padding: 15px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

/* Typography Utilities */
.page-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-color);
}

/* Components */
.card {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    background-color: var(--surface-color);
    color: var(--text-color);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control option {
    background-color: var(--surface-color);
    color: var(--text-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-family: inherit;
    font-size: 0.875rem;
}

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

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

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

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

/* Tables */
.table-container {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.table th, .table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background-color: var(--bg-color);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: rgba(0,0,0,0.01);
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-danger {
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #f87171;
}

.alert-success {
    background-color: #ecfdf5;
    color: #065f46;
    border: 1px solid #34d399;
}

/* Login Container */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-color);
    padding: 20px;
}

.login-card {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    border: 1px solid var(--border-color);
}

.login-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: var(--primary-color);
}