/* ==========================================
   MISTLAB - Қателер зертханасы
   Main Stylesheet
   ========================================== */

/* CSS Variables */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --secondary-dark: #059669;
    --accent: #f59e0b;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-light: #f8fafc;
    --bg-card: #ffffff;
    --bg-dark: #1e293b;
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    
    --border-color: #e2e8f0;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --border-radius-lg: 24px;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    
    --transition: all 0.3s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* PWA App Container */
.app-container {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100vh;
    background: var(--bg-light);
    position: relative;
}

/* ==========================================
   Login Screen
   ========================================== */
.login-screen {
    min-height: 100vh;
    background: var(--bg-gradient);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.login-screen::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: pulse 15s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.3; }
}

.login-content {
    position: relative;
    z-index: 1;
    text-align: center;
    width: 100%;
    max-width: 360px;
}

.login-logo {
    width: 120px;
    height: 120px;
    background: var(--bg-card);
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    box-shadow: var(--shadow-xl);
    font-size: 3rem;
}

.login-logo img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}

.login-title {
    color: var(--text-white);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.login-subtitle {
    color: rgba(255,255,255,0.9);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 2.5rem;
    padding: 0 1rem;
}

.login-form {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
}

.form-group {
    margin-bottom: 1.25rem;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-light);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-card);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--text-white);
    width: 100%;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--secondary-dark);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
}

/* ==========================================
   App Header
   ========================================== */
.app-header {
    background: var(--bg-gradient);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.header-logo {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.header-title {
    color: var(--text-white);
    font-size: 1.125rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-btn {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 10px;
    color: var(--text-white);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-btn:hover {
    background: rgba(255,255,255,0.3);
}

/* User Info */
.user-info {
    background: rgba(255,255,255,0.1);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 48px;
    height: 48px;
    background: var(--bg-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary);
    font-weight: 600;
}

.user-details h4 {
    color: var(--text-white);
    font-size: 1rem;
    font-weight: 600;
}

.user-details span {
    color: rgba(255,255,255,0.8);
    font-size: 0.8125rem;
}

/* ==========================================
   Main Content Area
   ========================================== */
.main-content {
    padding: 1.25rem;
    padding-bottom: 100px;
}

/* Page Title */
.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

/* ==========================================
   Menu Cards (Dashboard)
   ========================================== */
.menu-grid {
    display: grid;
    gap: 1rem;
}

.menu-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    border: 2px solid transparent;
}

.menu-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.menu-card:active {
    transform: scale(0.98);
}

.menu-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    flex-shrink: 0;
}

.menu-icon.purple { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.menu-icon.green { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }
.menu-icon.blue { background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%); }
.menu-icon.orange { background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%); }
.menu-icon.red { background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%); }
.menu-icon.teal { background: linear-gradient(135deg, #14b8a6 0%, #0d9488 100%); }

.menu-text h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.menu-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ==========================================
   Cards & Containers
   ========================================== */
.card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

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

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 1.25rem;
}

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

/* ==========================================
   Form Elements
   ========================================== */
.form-floating {
    position: relative;
    margin-bottom: 1rem;
}

.form-floating .form-control {
    padding: 1.5rem 1rem 0.5rem;
}

.form-floating label {
    position: absolute;
    top: 0;
    left: 1rem;
    padding: 1rem 0;
    font-size: 1rem;
    color: var(--text-light);
    transition: var(--transition);
    pointer-events: none;
}

.form-floating .form-control:focus ~ label,
.form-floating .form-control:not(:placeholder-shown) ~ label {
    transform: translateY(-0.5rem);
    font-size: 0.75rem;
    color: var(--primary);
}

/* Textarea */
textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* File Upload */
.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-light);
}

.file-upload:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.file-upload input {
    display: none;
}

.file-upload-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-light);
}

.file-upload-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-upload-text span {
    color: var(--primary);
    font-weight: 600;
}

/* Input Type Switcher */
.input-type-switch {
    display: flex;
    background: var(--bg-light);
    border-radius: var(--border-radius-sm);
    padding: 4px;
    margin-bottom: 1rem;
}

.input-type-btn {
    flex: 1;
    padding: 0.625rem;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.input-type-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* Select2 Styling Override */
.select2-container--default .select2-selection--single {
    height: 50px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-light);
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    line-height: 46px;
    padding-left: 1rem;
    color: var(--text-primary);
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 48px;
    right: 8px;
}

.select2-container--default.select2-container--focus .select2-selection--single {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.select2-dropdown {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
}

.select2-container--default .select2-results__option--highlighted[aria-selected] {
    background: var(--primary);
}

.select2-container--default .select2-search--dropdown .select2-search__field {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
}

/* ==========================================
   Алғы сөз (Foreword) Page
   ========================================== */
.foreword-content {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.foreword-content h2 {
    color: var(--primary);
    font-size: 1.375rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1.5rem;
}

.foreword-content p {
    margin-bottom: 1rem;
    text-align: justify;
    color: var(--text-secondary);
}

.foreword-list {
    background: var(--bg-light);
    border-radius: var(--border-radius-sm);
    padding: 1.25rem;
    margin: 1.25rem 0;
}

.foreword-list li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.foreword-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: bold;
}

.foreword-quote {
    text-align: center;
    padding: 1.25rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: var(--border-radius-sm);
    margin-top: 1.5rem;
}

.foreword-quote p {
    color: var(--primary);
    font-weight: 600;
    font-style: italic;
    margin-bottom: 0.5rem;
}

/* ==========================================
   Students List
   ========================================== */
.student-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.student-card:hover {
    box-shadow: var(--shadow);
}

.student-avatar {
    width: 50px;
    height: 50px;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-weight: 600;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.student-info {
    flex: 1;
    min-width: 0;
}

.student-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}

.student-class {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.student-stats {
    text-align: right;
}

.student-errors {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.student-label {
    font-size: 0.75rem;
    color: var(--text-light);
}

.student-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.action-btn.edit {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.action-btn.delete {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.action-btn:hover {
    transform: scale(1.1);
}

/* ==========================================
   Analytics Charts
   ========================================== */
.analytics-section {
    margin-bottom: 1.5rem;
}

.analytics-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.chart-placeholder {
    height: 250px;
    background: var(--bg-light);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

/* Filter Pills */
.filter-pills {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.filter-pill {
    padding: 0.5rem 1rem;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition);
}

.filter-pill.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-white);
}

.filter-pill:hover:not(.active) {
    border-color: var(--primary);
    color: var(--primary);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* ==========================================
   Bottom Navigation
   ========================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    z-index: 100;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.08);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-light);
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
}

.nav-item.active {
    color: var(--primary);
}

.nav-item:hover {
    background: var(--bg-light);
}

.nav-icon {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.nav-label {
    font-size: 0.6875rem;
    font-weight: 500;
}

/* ==========================================
   Modals
   ========================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-backdrop.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    transform: translateY(100%);
    transition: var(--transition);
    overflow: hidden;
}

.modal-backdrop.show .modal-content {
    transform: translateY(0);
}

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

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

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-light);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--border-color);
}

.modal-body {
    padding: 1.25rem;
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
}

/* ==========================================
   Alerts & Messages
   ========================================== */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* Offline Notice */
.offline-notice {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 480px;
    background: var(--danger);
    color: var(--text-white);
    text-align: center;
    padding: 0.75rem;
    z-index: 9999;
    font-size: 0.875rem;
    display: none;
}

.offline-notice.show {
    display: block;
}

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

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

.data-table th,
.data-table td {
    padding: 0.875rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-light);
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    font-size: 0.875rem;
    color: var(--text-primary);
}

.data-table tr:hover {
    background: var(--bg-light);
}

/* ==========================================
   Badge
   ========================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
}

.badge-primary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.badge-success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

/* ==========================================
   Empty State
   ========================================== */
.empty-state {
    text-align: center;
    padding: 3rem 1.5rem;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.empty-text {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ==========================================
   Floating Action Button
   ========================================== */
.fab {
    position: fixed;
    bottom: 90px;
    right: calc(50% - 220px);
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition);
    z-index: 90;
}

.fab:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

@media (max-width: 500px) {
    .fab {
        right: 1.25rem;
    }
}

/* ==========================================
   Utilities
   ========================================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

/* ==========================================
   Responsive
   ========================================== */
@media (min-width: 481px) {
    .app-container {
        box-shadow: 0 0 40px rgba(0,0,0,0.1);
    }
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fadeIn {
    animation: fadeIn 0.3s ease forwards;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-slideUp {
    animation: slideUp 0.4s ease forwards;
}

/* Stagger Animation */
.stagger > * {
    opacity: 0;
    animation: fadeIn 0.4s ease forwards;
}

.stagger > *:nth-child(1) { animation-delay: 0.1s; }
.stagger > *:nth-child(2) { animation-delay: 0.2s; }
.stagger > *:nth-child(3) { animation-delay: 0.3s; }
.stagger > *:nth-child(4) { animation-delay: 0.4s; }
.stagger > *:nth-child(5) { animation-delay: 0.5s; }