/* ============================================
   TESECH ADMIN PANEL - Premium Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #F97316;
    --primary-light: #FB923C;
    --primary-dark: #EA580C;
    --primary-glow: rgba(249, 115, 22, 0.15);
    --secondary: #6366F1;
    --secondary-light: #818CF8;
    
    --bg-dark: #0F1117;
    --bg-card: #1A1D27;
    --bg-card-hover: #1E2130;
    --bg-sidebar: #12141C;
    --bg-input: #1E2130;
    --bg-overlay: rgba(15, 17, 23, 0.8);
    
    --border: #2A2D3A;
    --border-light: #353849;
    
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #3B82F6;
    --premium: #A855F7;
    
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.35);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --sidebar-width: 270px;
    --header-height: 70px;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover { color: var(--primary-light); }

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(135deg, rgba(249,115,22,0.08), transparent);
}

.sidebar-brand .brand-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.sidebar-brand h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}
.sidebar-brand span {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-nav {
    padding: 16px 12px;
}

.nav-label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    padding: 16px 16px 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    margin-bottom: 2px;
    position: relative;
}
.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--primary-glow);
    color: var(--primary);
    font-weight: 600;
}
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: var(--primary);
    border-radius: 0 3px 3px 0;
}
.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 15px;
}
.nav-item .badge-count {
    margin-left: auto;
    background: var(--primary);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 10px;
}

/* ============================================
   HEADER
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.top-header {
    position: sticky;
    top: 0;
    z-index: 900;
    height: var(--header-height);
    background: rgba(15, 17, 23, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-left h1 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.header-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
}
.header-breadcrumb a { color: var(--text-secondary); }
.header-breadcrumb .sep { color: var(--border); }

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 16px;
}
.header-btn:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
    border-color: var(--primary);
}

.user-dropdown {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}
.user-dropdown:hover {
    border-color: var(--primary);
}
.user-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    color: #fff;
}
.user-info .name { font-size: 13px; font-weight: 600; }
.user-info .role { font-size: 11px; color: var(--text-muted); }

/* ============================================
   CONTENT AREA
   ============================================ */
.content-area {
    padding: 32px;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-header h1 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    border-color: var(--border-light);
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.card-body {
    padding: 24px;
}

.card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stat-card.orange::before { background: linear-gradient(90deg, var(--primary), var(--primary-light)); }
.stat-card.blue::before { background: linear-gradient(90deg, var(--info), #60A5FA); }
.stat-card.green::before { background: linear-gradient(90deg, var(--success), #34D399); }
.stat-card.purple::before { background: linear-gradient(90deg, var(--premium), #C084FC); }

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

.stat-info h4 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-info .stat-number {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1;
}

.stat-info .stat-change {
    font-size: 12px;
    color: var(--success);
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}
.stat-card.orange .stat-icon { background: var(--primary-glow); color: var(--primary); }
.stat-card.blue .stat-icon { background: rgba(59,130,246,0.15); color: var(--info); }
.stat-card.green .stat-icon { background: rgba(16,185,129,0.15); color: var(--success); }
.stat-card.purple .stat-icon { background: rgba(168,85,247,0.15); color: var(--premium); }

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

table {
    width: 100%;
    border-collapse: collapse;
}

table thead th {
    background: var(--bg-dark);
    padding: 14px 20px;
    text-align: left;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    white-space: nowrap;
    border-bottom: 1px solid var(--border);
}

table tbody td {
    padding: 14px 20px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

table tbody tr {
    transition: var(--transition);
}

table tbody tr:hover {
    background: var(--bg-card-hover);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: 'Inter', sans-serif;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.35);
    color: #fff;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    color: var(--text-primary);
}

.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-info { background: var(--info); color: #fff; }

.btn-sm { padding: 6px 14px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}
.btn-icon:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
    border-color: var(--primary);
}
.btn-icon.danger:hover { color: var(--danger); border-color: var(--danger); }

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group label .required {
    color: var(--danger);
    margin-left: 2px;
}

.form-control {
    width: 100%;
    padding: 11px 16px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

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

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394A3B8' d='M1.5 4L6 8.5L10.5 4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-check {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-danger { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-warning { background: rgba(245,158,11,0.15); color: var(--warning); }
.badge-info { background: rgba(59,130,246,0.15); color: var(--info); }
.badge-primary { background: var(--primary-glow); color: var(--primary); }
.badge-secondary { background: rgba(148,163,184,0.15); color: var(--text-secondary); }
.badge-premium { background: rgba(168,85,247,0.15); color: var(--premium); }

/* ============================================
   ALERTS
   ============================================ */
.alert {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 20px;
    animation: alertSlide 0.3s ease;
    position: relative;
}

@keyframes alertSlide {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.alert-success { background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.2); color: var(--success); }
.alert-error { background: rgba(239,68,68,0.12); border: 1px solid rgba(239,68,68,0.2); color: var(--danger); }
.alert-warning { background: rgba(245,158,11,0.12); border: 1px solid rgba(245,158,11,0.2); color: var(--warning); }
.alert-info { background: rgba(59,130,246,0.12); border: 1px solid rgba(59,130,246,0.2); color: var(--info); }

.alert-close {
    margin-left: auto;
    cursor: pointer;
    font-size: 18px;
    opacity: 0.7;
}
.alert-close:hover { opacity: 1; }

/* ============================================
   PAGINATION
   ============================================ */
.pagination {
    display: flex;
    align-items: center;
    gap: 6px;
    justify-content: center;
    margin-top: 24px;
}

.page-link {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
}
.page-link:hover { border-color: var(--primary); color: var(--primary); }
.page-link.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}
.modal-overlay.show { display: flex; }

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from { opacity: 0; transform: translateY(-20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-dark);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition);
}
.modal-close:hover { color: var(--danger); }

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    margin-bottom: 20px;
}

/* ============================================
   FILTERS BAR
   ============================================ */
.filters-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filters-bar .form-control {
    width: auto;
    min-width: 180px;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 250px;
}

.search-box input {
    padding-left: 40px;
}

.search-box i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* ============================================
   QUICK ACTIONS
   ============================================ */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.quick-action-btn:hover {
    border-color: var(--primary);
    background: var(--primary-glow);
    color: var(--primary);
}

.quick-action-btn i {
    font-size: 20px;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
}

.quick-action-btn span {
    font-weight: 600;
    font-size: 14px;
}

/* ============================================
   LOGIN PAGE
   ============================================ */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    padding: 20px;
    position: relative;
}

.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow), transparent 70%);
    pointer-events: none;
}

.login-card {
    width: 100%;
    max-width: 440px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-lg);
}

.login-card .brand {
    text-align: center;
    margin-bottom: 32px;
}

.login-card .brand .brand-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    margin-bottom: 16px;
    box-shadow: 0 6px 20px rgba(249, 115, 22, 0.3);
}

.login-card .brand h1 {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.login-card .brand p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 6px;
}

.login-card .form-group label {
    font-size: 13px;
}

.login-card .btn-primary {
    width: 100%;
    padding: 12px;
    justify-content: center;
    font-size: 15px;
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-muted);
}

.login-footer a {
    color: var(--primary);
    font-weight: 600;
}

.divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 12px;
}
.divider::before, .divider::after {
    content: '';
    flex: 1;
    border-top: 1px solid var(--border);
}

/* ============================================
   TREE VIEW (Syllabus)
   ============================================ */
.tree-view {
    list-style: none;
    padding: 0;
}

.tree-item {
    border-bottom: 1px solid var(--border);
}

.tree-item:last-child { border-bottom: none; }

.tree-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    cursor: pointer;
    transition: var(--transition);
}

.tree-header:hover {
    background: var(--bg-card-hover);
}

.tree-toggle {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tree-header.open .tree-toggle {
    transform: rotate(90deg);
    color: var(--primary);
}

.tree-label {
    flex: 1;
    font-weight: 500;
}

.tree-actions {
    display: flex;
    gap: 8px;
}

.tree-children {
    display: none;
    padding-left: 24px;
    border-left: 2px solid var(--border);
    margin-left: 30px;
}

.tree-children.open {
    display: block;
}

/* ============================================
   RESPONSIVE
   ============================================ */
.sidebar-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }
    .main-content {
        margin-left: 0;
    }
    .sidebar-toggle {
        display: flex;
    }
    .form-row {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .content-area {
        padding: 20px 16px;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .top-header {
        padding: 0 16px;
    }
    .filters-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .filters-bar .form-control,
    .search-box {
        min-width: 100%;
    }
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ============================================
   ROW ACTIONS
   ============================================ */
.row-actions {
    display: flex;
    gap: 6px;
}

/* ============================================
   WHATSAPP BUTTON
   ============================================ */
.btn-whatsapp {
    background: #25D366;
    color: #fff;
    padding: 6px 14px;
    font-size: 12px;
}
.btn-whatsapp:hover {
    background: #1DA851;
    color: #fff;
}

/* ============================================
   LOADING SPINNER
   ============================================ */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   TABS
   ============================================ */
.tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.tab {
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.tab:hover { color: var(--text-primary); }
.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}