/* CSS Variables for Design System */
:root {
    /* Primary Colors */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;

    /* Neutral Colors */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;

    /* Success Colors */
    --success-50: #f0fdf4;
    --success-100: #dcfce7;
    --success-500: #22c55e;
    --success-600: #16a34a;

    /* Warning Colors */
    --warning-50: #fffbeb;
    --warning-100: #fef3c7;
    --warning-500: #f59e0b;
    --warning-600: #d97706;

    /* Error Colors */
    --error-50: #fef2f2;
    --error-100: #fee2e2;
    --error-500: #ef4444;
    --error-600: #dc2626;

    /* Shadows */
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--neutral-700);
    background: var(--neutral-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--neutral-200);
    border-top: 3px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Header */
.header {
    background: #fff;
    border-bottom: 1px solid var(--neutral-200);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) 0;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neutral-900);
    margin: 0;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--primary-500);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    color: var(--neutral-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

.nav-link.active {
    color: var(--primary-600);
    background: var(--primary-50);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -17px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-500);
    border-radius: 50%;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: var(--space-2);
    color: var(--neutral-600);
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: var(--space-8);
    opacity: 0.9;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat {
    text-align: center;
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(8px);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
}

.feature-cards {
    display: grid;
    gap: var(--space-4);
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    backdrop-filter: blur(8px);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-card i {
    width: 24px;
    height: 24px;
    margin-bottom: var(--space-3);
    color: var(--primary-200);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.feature-card p {
    opacity: 0.8;
    line-height: 1.5;
}

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--primary-600);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: white;
    color: var(--primary-600);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--neutral-600);
    border: 1px solid var(--neutral-300);
}

.btn-outline:hover {
    background: var(--neutral-100);
    border-color: var(--neutral-400);
}

.btn-text {
    background: transparent;
    color: var(--neutral-500);
    padding: var(--space-2) var(--space-3);
}

.btn-text:hover {
    color: var(--neutral-700);
    background: var(--neutral-100);
}

.btn-generate {
    background: linear-gradient(135deg, var(--success-500), var(--success-600));
    color: white;
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-small {
    padding: var(--space-2) var(--space-3);
    font-size: 0.75rem;
}

/* Main Container */
.main-container {
    margin: var(--space-12) auto;
}

.main-grid {
    display: grid;
    grid-template-columns: 280px 1fr 280px;
    gap: var(--space-8);
    align-items: start;
}

/* Sidebar Styles */
.sidebar {
    position: sticky;
    top: calc(80px + var(--space-4));
    height: fit-content;
}

.sidebar-section {
    background: white;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-sm);
}

.sidebar-section h3 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1rem;
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--neutral-200);
}

.quick-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.quick-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    color: var(--neutral-600);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
}

.quick-link:hover {
    background: var(--neutral-100);
    color: var(--neutral-900);
}

.announcement {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--warning-50);
    border: 1px solid var(--warning-100);
    border-radius: var(--radius-lg);
}

.announcement-icon {
    color: var(--warning-500);
}

.announcement h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--warning-800);
    margin-bottom: var(--space-1);
}

.announcement p {
    font-size: 0.75rem;
    color: var(--warning-700);
    line-height: 1.4;
}

.stats-grid {
    display: grid;
    gap: var(--space-3);
}

.stat-card {
    text-align: center;
    padding: var(--space-4);
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-200);
}

.stat-card .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
}

.stat-card .stat-label {
    font-size: 0.75rem;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tips-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.tip {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--primary-50);
    border-radius: var(--radius-md);
}

.tip i {
    color: var(--primary-500);
    flex-shrink: 0;
}

.tip p {
    font-size: 0.8rem;
    color: var(--primary-700);
    line-height: 1.4;
}

.upgrade-card {
    text-align: center;
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border-radius: var(--radius-lg);
}

.upgrade-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
}

.upgrade-card h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-3);
}

.upgrade-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: var(--space-4);
}

.upgrade-card ul li {
    padding: var(--space-1) 0;
    font-size: 0.875rem;
    opacity: 0.9;
}

.upgrade-card ul li::before {
    content: '✓';
    margin-right: var(--space-2);
    color: var(--success-300);
}

/* Main Content */
.main-content {
    min-height: 100vh;
}

.content-section {
    background: white;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-8);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--neutral-200);
    background: var(--neutral-50);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--neutral-900);
    margin: 0;
}

.section-actions {
    display: flex;
    gap: var(--space-2);
}

/* Filter Panel */
.filter-panel {
    padding: var(--space-6);
    background: var(--neutral-50);
    border-bottom: 1px solid var(--neutral-200);
}

.filter-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.filter-header h3 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1rem;
    font-weight: 600;
    color: var(--neutral-700);
    margin: 0;
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.filter-group label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--neutral-700);
}

.filter-select, .form-select {
    padding: var(--space-3);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    background: white;
    font-size: 0.875rem;
    color: var(--neutral-700);
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.filter-select:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Question Container */
.question-container {
    padding: var(--space-6);
}

.question-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-6);
}

.results-info {
    font-size: 0.875rem;
    color: var(--neutral-600);
}

.view-options {
    display: flex;
    gap: var(--space-1);
}

.view-btn {
    padding: var(--space-2);
    background: transparent;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    color: var(--neutral-500);
    cursor: pointer;
    transition: all 0.2s ease;
}

.view-btn:hover {
    background: var(--neutral-100);
    border-color: var(--neutral-400);
}

.view-btn.active {
    background: var(--primary-500);
    border-color: var(--primary-500);
    color: white;
}

/* Question List */
.question-list {
    display: grid;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.question-list.grid-view {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
}

.question-list.list-view {
    grid-template-columns: 1fr;
}

.question-item {
    background: white;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    transition: all 0.2s ease;
    position: relative;
}

.question-item:hover {
    border-color: var(--primary-300);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.question-item .question-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.question-item .meta-tag {
    padding: var(--space-1) var(--space-2);
    background: var(--neutral-100);
    color: var(--neutral-600);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.question-item .question-content {
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.question-item .question-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin-top: var(--space-2);
}

.question-item .question-options {
    margin-bottom: var(--space-4);
}

.question-item .question-options ul {
    list-style: none;
    display: grid;
    gap: var(--space-2);
}

.question-item .question-options li {
    padding: var(--space-2) var(--space-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.question-item .question-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.question-item .add-btn {
    background: var(--success-500);
    color: white;
    border: none;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.question-item .add-btn:hover {
    background: var(--success-600);
    transform: translateY(-1px);
}

/* Selected Questions */
.selected-questions-container {
    padding: var(--space-6);
}

.selected-question-item {
    background: var(--success-50);
    border: 1px solid var(--success-200);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    position: relative;
}

.selected-question-item .question-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-3);
}

.selected-question-item .question-number {
    font-weight: 600;
    color: var(--success-700);
    margin-bottom: var(--space-2);
}

.selected-question-item .question-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.selected-question-item .marks-input {
    width: 80px;
    padding: var(--space-2);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.selected-question-item .remove-btn {
    background: var(--error-500);
    color: white;
    border: none;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.selected-question-item .remove-btn:hover {
    background: var(--error-600);
}

/* Form Styles */
.form-panel {
    padding: var(--space-6);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--neutral-700);
}

.form-input, .form-textarea {
    padding: var(--space-3);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--neutral-700);
    transition: all 0.2s ease;
}

.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.radio-group {
    display: flex;
    gap: var(--space-4);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.radio-option:hover {
    border-color: var(--primary-300);
    background: var(--primary-50);
}

.radio-option input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 16px;
    height: 16px;
    border: 2px solid var(--neutral-400);
    border-radius: 50%;
    position: relative;
    transition: all 0.2s ease;
}

.radio-option input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-500);
    background: var(--primary-500);
}

.radio-option input[type="radio"]:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
}

.file-upload-area {
    position: relative;
    border: 2px dashed var(--neutral-300);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.file-upload-area:hover {
    border-color: var(--primary-400);
    background: var(--primary-50);
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload-content i {
    font-size: 2rem;
    color: var(--neutral-400);
    margin-bottom: var(--space-3);
}

.file-upload-content p {
    font-weight: 500;
    color: var(--neutral-700);
    margin-bottom: var(--space-1);
}

.file-upload-content span {
    font-size: 0.75rem;
    color: var(--neutral-500);
}

.image-preview {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--radius-md);
    margin-top: var(--space-4);
    box-shadow: var(--shadow-md);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    padding-top: var(--space-4);
    border-top: 1px solid var(--neutral-200);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.pagination-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: white;
    border: 1px solid var(--neutral-300);
    border-radius: var(--radius-md);
    color: var(--neutral-600);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--neutral-100);
    border-color: var(--neutral-400);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-info {
    font-size: 0.875rem;
    color: var(--neutral-600);
    font-weight: 500;
}

/* Generate Section */
.generate-section {
    text-align: center;
    padding: var(--space-8);
}

/* Footer */
.footer {
    background: var(--neutral-900);
    color: var(--neutral-300);
    padding: var(--space-16) 0 var(--space-8);
    margin-top: var(--space-20);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-16);
    margin-bottom: var(--space-12);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.footer-logo i {
    color: var(--primary-400);
}

.footer-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    color: white;
}

.footer-brand p {
    line-height: 1.6;
    color: var(--neutral-400);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.link-group h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.link-group a {
    display: block;
    color: var(--neutral-400);
    text-decoration: none;
    margin-bottom: var(--space-2);
    transition: color 0.2s ease;
}

.link-group a:hover {
    color: var(--primary-400);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-8);
    border-top: 1px solid var(--neutral-800);
}

.footer-bottom p {
    color: var(--neutral-500);
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: var(--space-4);
}

.footer-social a {
    width: 36px;
    height: 36px;
    background: var(--neutral-800);
    color: var(--neutral-400);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.footer-social a:hover {
    background: var(--primary-500);
    color: white;
}

/* Toast Notifications */
.toast {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    background: var(--success-500);
    color: white;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateX(0);
}

.toast.error {
    background: var(--error-500);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .sidebar {
        position: static;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .header-content {
        flex-wrap: wrap;
        gap: var(--space-4);
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        border-top: 1px solid var(--neutral-200);
        flex-direction: column;
        padding: var(--space-4);
        gap: var(--space-2);
    }
    
    .nav.nav-open {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero {
        padding: var(--space-12) 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .filter-grid {
        grid-template-columns: 1fr;
    }
    
    .question-list.grid-view {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .radio-group {
        flex-direction: column;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .pagination {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .pagination-btn {
        width: 100%;
        justify-content: center;
    }
    
    .toast {
        left: var(--space-4);
        right: var(--space-4);
        transform: translateY(-100%);
    }
    
    .toast.show {
        transform: translateY(0);
    }
}

/* Animation and Interaction Enhancements */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.question-item, .selected-question-item, .sidebar-section {
    animation: fadeInUp 0.3s ease-out;
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--neutral-100);
}

::-webkit-scrollbar-thumb {
    background: var(--neutral-400);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neutral-500);
}

/* Print Styles */
@media print {
    .header, .sidebar, .filter-panel, .pagination, .footer {
        display: none !important;
    }
    
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .question-item {
        page-break-inside: avoid;
        border: 1px solid #000;
        margin-bottom: 1rem;
    }
}

/* ============================================= */
/* == STYLES FOR SOLUTIONS PAGE (answer.php)  == */
/* ============================================= */

.solutions-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.solution-item {
    background: white;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.solution-item:hover {
    border-color: var(--primary-300);
    box-shadow: var(--shadow-md);
}

.solution-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.solution-question h4,
.solution-answer-wrapper h4 {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1rem;
    font-weight: 600;
    color: var(--neutral-800);
    margin-bottom: var(--space-3);
}

.solution-question .content-block {
    background: var(--neutral-50);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    line-height: 1.6;
    margin: 0;
}
.solution-question .content-block img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

.toggle-solution-btn {
    background: var(--primary-100);
    color: var(--primary-700);
    border: 1px solid transparent;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.toggle-solution-btn:hover {
    background: var(--primary-200);
    border-color: var(--primary-300);
}

.solution-answer-wrapper {
    display: none; /* Solutions are hidden by default */
    margin-top: var(--space-4);
    border-top: 1px solid var(--neutral-200);
    padding-top: var(--space-4);
}

.solution-answer-wrapper .content-block {
    background: var(--success-50);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    line-height: 1.6;
    border-left: 4px solid var(--success-500);
}