/* EPP Domain Manager - ResellerPanel Style Theme */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Primary colors */
    --sidebar-bg: #1e3a5f;
    --sidebar-hover: #2a4a73;
    --sidebar-active: #3b5998;
    --header-bg: #1e3a5f;

    /* Content colors */
    --content-bg: #f0f2f5;
    --card-bg: #ffffff;
    --card-border: #e5e7eb;

    /* Text colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-white: #ffffff;

    /* Accent colors */
    --accent-blue: #3b82f6;
    --accent-green: #22c55e;
    --accent-red: #ef4444;
    --accent-orange: #f97316;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;

    /* Layout */
    --sidebar-width: 250px;
    --header-height: 60px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* ============================================
   Reset & Base
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--content-bg);
}

h1, h2, h3, h4, h5, h6 {
    margin: 0 0 0.5rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }

p { margin: 0 0 1rem; }
a { color: var(--accent-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================
   App Layout
   ============================================ */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 1rem 1.25rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-white);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-brand svg {
    width: 24px;
    height: 24px;
}

/* Main container */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    background-color: var(--header-bg);
    color: var(--text-white);
    height: var(--header-height);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-title {
    font-size: 1.125rem;
    font-weight: 500;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-greeting {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
}

.user-greeting strong {
    color: var(--text-white);
}

.user-dropdown {
    position: relative;
}

.user-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    padding: 0.375rem 0.625rem;
    color: var(--text-white);
    cursor: pointer;
    transition: all 0.15s ease;
}

.user-dropdown-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.user-avatar {
    width: 28px;
    height: 28px;
    background: var(--accent-blue);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-white);
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1100;
    overflow: hidden;
}

.user-dropdown-menu .dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.15s ease;
    border: none;
    background: none;
    width: 100%;
    font-size: 0.875rem;
    cursor: pointer;
    text-align: left;
}

.user-dropdown-menu .dropdown-item:hover {
    background-color: var(--content-bg);
    text-decoration: none;
}

.user-dropdown-menu .dropdown-item svg {
    width: 16px;
    height: 16px;
    color: var(--text-muted);
}

.user-dropdown-menu .dropdown-item.logout {
    color: var(--accent-red);
}

.user-dropdown-menu .dropdown-item.logout svg {
    color: var(--accent-red);
}

.user-dropdown-menu .dropdown-divider {
    height: 1px;
    background-color: var(--card-border);
    margin: 0.25rem 0;
}

.dropdown-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1050;
}

/* Sidebar toggle button */
.sidebar-toggle {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-white);
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
}

.sidebar-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.header-spacer {
    flex: 1;
}

/* Content area */
.app-content {
    flex: 1;
    padding: 1.5rem;
    background-color: var(--content-bg);
}

/* ============================================
   Navigation
   ============================================ */
.nav-menu {
    padding: 0.5rem 0;
    list-style: none;
    margin: 0;
}

.nav-item {
    margin: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: all 0.15s ease;
    cursor: pointer;
}

.nav-link:hover {
    background-color: var(--sidebar-hover);
    color: var(--text-white);
    text-decoration: none;
}

.nav-link.active {
    background-color: var(--sidebar-active);
    color: var(--text-white);
}

.nav-link svg,
.nav-link .nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    opacity: 0.9;
}

.nav-link-text {
    flex: 1;
}

.nav-chevron {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.nav-item.expanded .nav-chevron {
    transform: rotate(90deg);
}

/* Nav Group Toggle (Domains, Admin buttons) */
.nav-group-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    transition: all 0.15s ease;
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    text-align: left;
}

.nav-group-toggle:hover {
    background-color: var(--sidebar-hover);
    color: var(--text-white);
}

.nav-group-toggle span {
    flex: 1;
}

.nav-group-toggle .chevron {
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
    opacity: 0.7;
}

.nav-group.expanded .nav-group-toggle {
    background-color: var(--sidebar-active);
    color: var(--text-white);
}

.nav-group.expanded .nav-group-toggle .chevron {
    transform: rotate(90deg);
}

/* Submenu */
.nav-submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    background-color: rgba(0, 0, 0, 0.2);
    display: none;
    overflow: hidden;
}

.nav-group.expanded .nav-submenu {
    display: block;
}

.nav-subitem {
    margin: 0;
}

.nav-sublink {
    display: block;
    padding: 0.625rem 1.25rem 0.625rem 3.25rem;
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.875rem;
    text-decoration: none;
    transition: all 0.15s ease;
    position: relative;
}

.nav-sublink::before {
    content: '';
    position: absolute;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
}

.nav-sublink:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    text-decoration: none;
}

.nav-sublink:hover::before {
    background-color: var(--text-white);
}

.nav-sublink.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--text-white);
}

.nav-sublink.active::before {
    background-color: var(--accent-blue);
}

/* Nav Divider */
.nav-divider {
    height: 1px;
    background-color: rgba(255, 255, 255, 0.1);
    margin: 0.5rem 1rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
}

.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--card-border);
    background-color: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h5 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

.card-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--card-border);
    background-color: #f9fafb;
}

/* Page header: title/breadcrumb on the left, optional actions (e.g. Back) on the right */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.page-header-content {
    flex: 1 1 auto;
    min-width: 0;
}

.page-header h1 {
    margin-bottom: 0;
}

/* Data card (white content card) */
.data-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

.data-card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.data-card-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.data-card-body {
    padding: 1.25rem;
}

/* Stat card */
.stat-card {
    background: var(--stat-bg, var(--card-bg));
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-card .stat-value {
    color: var(--stat-color, var(--text-primary));
}

.stat-card .stat-icon {
    color: var(--stat-color, var(--text-muted));
}

/* Stat card color variants */
.stat-blue {
    --stat-color: #3b82f6;
    --stat-bg: rgba(59, 130, 246, 0.1);
}

.stat-green {
    --stat-color: #22c55e;
    --stat-bg: rgba(34, 197, 94, 0.1);
}

.stat-red {
    --stat-color: #ef4444;
    --stat-bg: rgba(239, 68, 68, 0.1);
}

.stat-orange {
    --stat-color: #f97316;
    --stat-bg: rgba(249, 115, 22, 0.1);
}

.stat-purple {
    --stat-color: #8b5cf6;
    --stat-bg: rgba(139, 92, 246, 0.1);
}

.stat-teal {
    --stat-color: #14b8a6;
    --stat-bg: rgba(20, 184, 166, 0.1);
}

.stat-grey {
    --stat-color: #6b7280;
    --stat-bg: rgba(107, 114, 128, 0.1);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.stat-value.blue { color: var(--accent-blue); }
.stat-value.green { color: var(--accent-green); }
.stat-value.red { color: var(--accent-red); }
.stat-value.orange { color: var(--accent-orange); }
.stat-value.purple { color: var(--accent-purple); }
.stat-value.cyan { color: var(--accent-cyan); }

.stat-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* Notification card */
.notification-card {
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--text-white);
    margin-bottom: 1rem;
}

.notification-card.green { background-color: var(--accent-green); }
.notification-card.blue { background-color: var(--accent-blue); }
.notification-card.orange { background-color: var(--accent-orange); }
.notification-card.red { background-color: var(--accent-red); }
.notification-card.purple { background-color: var(--accent-purple); }
.notification-card.cyan { background-color: var(--accent-cyan); }

.notification-content {
    display: flex;
    flex-direction: column;
}

.notification-value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.notification-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

.notification-icon {
    width: 40px;
    height: 40px;
    opacity: 0.8;
}

/* ============================================
   Stats Grid
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.notifications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 992px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .stats-grid,
    .notifications-grid {
        grid-template-columns: 1fr;
    }
}

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

.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--card-bg);
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus {
    border-color: var(--accent-blue);
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-control-plaintext {
    padding: 0.5rem 0;
    margin-bottom: 0;
    border: none;
    background: transparent;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-input {
    width: 1rem;
    height: 1rem;
    margin: 0;
}

.form-check-label {
    margin: 0;
    font-size: 0.875rem;
}

.form-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.validation-message {
    color: var(--accent-red);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: 0.375rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--text-white);
}

.btn-primary:hover {
    background-color: #2563eb;
    border-color: #2563eb;
}

.btn-secondary {
    background-color: #6b7280;
    border-color: #6b7280;
    color: var(--text-white);
}

.btn-secondary:hover {
    background-color: #4b5563;
    border-color: #4b5563;
}

.btn-success {
    background-color: var(--accent-green);
    border-color: var(--accent-green);
    color: var(--text-white);
}

.btn-success:hover {
    background-color: #16a34a;
    border-color: #16a34a;
}

.btn-danger {
    background-color: var(--accent-red);
    border-color: var(--accent-red);
    color: var(--text-white);
}

.btn-danger:hover {
    background-color: #dc2626;
    border-color: #dc2626;
}

.btn-warning {
    background-color: var(--accent-orange);
    border-color: var(--accent-orange);
    color: var(--text-white);
}

.btn-warning:hover {
    background-color: #ea580c;
    border-color: #ea580c;
}

.btn-info {
    background-color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: var(--text-white);
}

.btn-info:hover {
    background-color: #0891b2;
    border-color: #0891b2;
}

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.btn-outline-primary:hover {
    background-color: var(--accent-blue);
    color: var(--text-white);
}

.btn-outline-secondary {
    background-color: transparent;
    border-color: #6b7280;
    color: #6b7280;
}

.btn-outline-secondary:hover {
    background-color: #6b7280;
    color: var(--text-white);
}

.btn-outline-danger {
    background-color: transparent;
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.btn-outline-danger:hover {
    background-color: var(--accent-red);
    color: var(--text-white);
}

/* ============================================
   Tables
   ============================================ */
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

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

.table th {
    font-weight: 600;
    color: var(--text-secondary);
    background-color: #f9fafb;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

.table tbody tr:hover {
    background-color: #f9fafb;
}

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

/* ============================================
   Badges
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
}

.badge-primary, .bg-primary { background-color: var(--accent-blue); color: var(--text-white); }
.badge-success, .bg-success { background-color: var(--accent-green); color: var(--text-white); }
.badge-danger, .bg-danger { background-color: var(--accent-red); color: var(--text-white); }
.badge-warning, .bg-warning { background-color: var(--accent-orange); color: var(--text-white); }
.badge-info, .bg-info { background-color: var(--accent-cyan); color: var(--text-white); }
.badge-secondary, .bg-secondary { background-color: #6b7280; color: var(--text-white); }

/* ============================================
   Alerts
   ============================================ */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background-color: #dcfce7;
    border: 1px solid #86efac;
    color: #166534;
}

.alert-danger {
    background-color: #fee2e2;
    border: 1px solid #fca5a5;
    color: #991b1b;
}

.alert-warning {
    background-color: #fef3c7;
    border: 1px solid #fcd34d;
    color: #92400e;
}

.alert-info {
    background-color: #dbeafe;
    border: 1px solid #93c5fd;
    color: #1e40af;
}

.alert-dismissible {
    padding-right: 3rem;
    position: relative;
}

.alert .btn-close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.5;
    padding: 0;
    line-height: 1;
}

.alert .btn-close:hover {
    opacity: 1;
}

/* ============================================
   Modals
   ============================================ */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1040;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    margin: 1rem;
}

.modal-lg {
    max-width: 800px;
}

.modal-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0;
}

.modal-body {
    padding: 1.25rem;
}

.modal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--card-border);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* ============================================
   Tabs
   ============================================ */
.nav-tabs {
    display: flex;
    border-bottom: 1px solid var(--card-border);
    margin-bottom: 1rem;
}

.nav-tabs .nav-link {
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    background: transparent;
}

.nav-tabs .nav-link:hover {
    color: var(--text-primary);
    background: transparent;
}

.nav-tabs .nav-link.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
    background: transparent;
}

/* ============================================
   Spinner
   ============================================ */
.spinner-border {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 1.5px;
}

@keyframes spinner-border {
    to { transform: rotate(360deg); }
}

/* ============================================
   Utilities
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.5rem;
}

.col { flex: 1; padding: 0 0.5rem; }

.col-md-4, .col-md-6, .col-md-8, .col-lg-4, .col-lg-8 {
    padding: 0 0.5rem;
    width: 100%;
}

@media (min-width: 768px) {
    .col-md-4 { width: 33.333%; flex: 0 0 auto; }
    .col-md-6 { width: 50%; flex: 0 0 auto; }
    .col-md-8 { width: 66.666%; flex: 0 0 auto; }
}

@media (min-width: 992px) {
    .col-lg-4 { width: 33.333%; flex: 0 0 auto; }
    .col-lg-8 { width: 66.666%; flex: 0 0 auto; }
}

/* Spacing */
.m-0 { margin: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }
.me-1 { margin-right: 0.25rem; }
.me-2 { margin-right: 0.5rem; }
.me-3 { margin-right: 1rem; }
.ms-1 { margin-left: 0.25rem; }
.ms-2 { margin-left: 0.5rem; }
.ms-3 { margin-left: 1rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline-flex { display: inline-flex; }
.d-grid { display: grid; }

/* Flexbox */
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-1 { flex: 1; }
.align-items-center { align-items: center; }
.align-items-start { align-items: flex-start; }
.align-items-end { align-items: flex-end; }
.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-end { justify-content: flex-end; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* Text */
.text-center { text-align: center; }
.text-start { text-align: left; }
.text-end { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--accent-blue); }
.text-success { color: var(--accent-green); }
.text-danger { color: var(--accent-red); }
.text-warning { color: var(--accent-orange); }
.text-nowrap { white-space: nowrap; }
.fw-bold { font-weight: 700; }
.fw-semibold { font-weight: 600; }
.fw-medium { font-weight: 500; }
.fw-normal { font-weight: 400; }
.fs-sm { font-size: 0.875rem; }
.fs-xs { font-size: 0.75rem; }

/* Other */
.w-100 { width: 100%; }
.h-100 { height: 100%; }
.rounded { border-radius: 0.375rem; }
.border { border: 1px solid var(--card-border); }
.border-0 { border: none; }
.shadow-sm { box-shadow: var(--shadow-sm); }
.overflow-hidden { overflow: hidden; }
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Page-specific: Auth pages (Login/Register)
   ============================================ */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--sidebar-bg) 0%, #2d4a73 100%);
    padding: 1rem;
}

.auth-card {
    background: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
}

.auth-header {
    background: var(--sidebar-bg);
    color: var(--text-white);
    padding: 1.5rem;
    text-align: center;
}

.auth-header h1 {
    color: var(--text-white);
    font-size: 1.5rem;
    margin: 0;
}

.auth-body {
    padding: 1.5rem;
}

/* ============================================
   Responsive: Mobile sidebar
   ============================================ */
@media (max-width: 768px) {
    .app-sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .app-sidebar.open {
        transform: translateX(0);
    }

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

    .sidebar-toggle {
        display: flex;
    }

    .mobile-overlay {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease;
    }

    .mobile-overlay.show {
        opacity: 1;
        visibility: visible;
    }
}

@media (min-width: 769px) {
    .sidebar-toggle {
        display: none;
    }

    .mobile-overlay {
        display: none;
    }
}

/* ============================================
   Focus & Accessibility
   ============================================ */
:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

h1:focus,
h2:focus,
h3:focus {
    outline: none;
}