/* MyTestVerse - Modern CSS Framework */

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

:root {
    /* Color Palette */
    --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;

    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;

    --success-500: #10b981;
    --warning-500: #f59e0b;
    --error-500: #ef4444;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;

    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;

    /* 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);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--secondary-700);
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-4);
}

a {
    color: var(--primary-600);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-700);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
    font-size: 0.875rem;
    line-height: 1.25rem;
}

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

.btn-primary {
    background-color: var(--primary-600);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--secondary-100);
    color: var(--secondary-700);
    border: 1px solid var(--secondary-200);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-200);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-600);
    border: 2px solid var(--primary-600);
}

.btn-outline:hover:not(:disabled) {
    background-color: var(--primary-600);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-lg {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: 1rem;
    line-height: 1.5rem;
}

.btn-sm {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: 0.75rem;
    line-height: 1rem;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-4);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-1);
    font-weight: 500;
    color: var(--secondary-700);
}

.form-input {
    width: 100%;
    padding: var(--spacing-3);
    border: 1px solid var(--secondary-300);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-input.error {
    border-color: var(--error-500);
}

.form-input.error:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
    color: var(--error-500);
    font-size: 0.875rem;
    margin-top: var(--spacing-1);
}

.form-success {
    color: var(--success-500);
    font-size: 0.875rem;
    margin-top: var(--spacing-1);
}

/* Cards */
.card {
    background-color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-6);
    border: 1px solid var(--secondary-100);
    transition: all var(--transition-normal);
}

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

/* Navigation */
.navbar {
    background-color: white;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--secondary-200);
    position: sticky;
    top: 0;
    z-index: 50;
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-600);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--primary-700);
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-6);
}

.navbar-nav a {
    color: var(--secondary-600);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--primary-600);
}

.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--secondary-600);
}

/* Footer */
.footer {
    background-color: var(--secondary-800);
    color: white;
    padding: var(--spacing-12) 0 var(--spacing-8);
}

.footer h3 {
    color: white;
    margin-bottom: var(--spacing-4);
}

.footer a {
    color: var(--secondary-300);
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
    padding: var(--spacing-20) 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--secondary-800);
    margin-bottom: var(--spacing-6);
}

.hero p {
    font-size: 1.25rem;
    color: var(--secondary-600);
    margin-bottom: var(--spacing-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-600); }
.text-secondary { color: var(--secondary-600); }
.text-success { color: var(--success-500); }
.text-warning { color: var(--warning-500); }
.text-error { color: var(--error-500); }

.bg-primary { background-color: var(--primary-600); }
.bg-primary-light { background-color: var(--primary-50); }
.bg-secondary { background-color: var(--secondary-100); }

.mt-4 { margin-top: var(--spacing-4); }
.mb-4 { margin-bottom: var(--spacing-4); }
.py-4 { padding: var(--spacing-4) 0; }
.px-4 { padding: 0 var(--spacing-4); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.shadow { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Flash Messages */
.flash-message {
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-4);
    font-weight: 500;
}

.flash-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

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

.flash-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.flash-info {
    background-color: var(--primary-50);
    color: var(--primary-800);
    border: 1px solid var(--primary-200);
}

/* Loading Spinner */
.loading-spinner {
    border: 3px solid var(--secondary-200);
    border-top: 3px solid var(--primary-600);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: inline-block;
}

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

/* Mobile First Responsive Design */

/* Tablet Styles */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Mobile Styles - Clean & Simple */
@media (max-width: 768px) {
    /* Container */
    .container {
        padding: 0 15px;
        max-width: 100%;
        overflow-x: hidden;
    }
    
    /* Hero Section */
    .hero {
        padding: 40px 0;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 1.8rem;
        line-height: 1.3;
        margin-bottom: 20px;
    }
    
    .hero p {
        font-size: 1rem;
        margin-bottom: 30px;
        line-height: 1.5;
    }
    
    /* Grid Layouts */
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    /* Navigation - Simple */
    .navbar {
        position: relative;
        padding: 10px 0;
    }
    
    .navbar-nav {
        display: none;
    }
    
    .navbar-toggle {
        display: block;
        background: none;
        border: none;
        color: var(--secondary-600);
        font-size: 1.5rem;
        cursor: pointer;
        padding: 10px;
        border-radius: 5px;
    }
    
    .navbar.mobile-open .navbar-nav {
        display: flex !important;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        padding: 20px;
        border-radius: 0 0 10px 10px;
        z-index: 1000;
        border: 1px solid #e2e8f0;
    }
    
    .navbar.mobile-open .navbar-nav li {
        margin: 5px 0;
    }
    
    .navbar.mobile-open .navbar-nav a {
        padding: 12px 16px;
        border-radius: 5px;
        display: block;
    }
    
    /* Cards */
    .card {
        margin-bottom: 20px;
        padding: 20px;
    }
    
    /* Buttons */
    .btn {
        width: 100%;
        padding: 12px 20px;
        font-size: 1rem;
        margin-bottom: 10px;
        text-align: center;
    }
    
    /* Forms */
    .form-group {
        margin-bottom: 20px;
    }
    
    .form-control {
        font-size: 16px;
        padding: 12px;
        width: 100%;
    }
    
    /* Stats Grid */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .stat-card {
        padding: 20px;
        text-align: center;
    }
    
    /* Footer */
    .footer .grid {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
}

/* Small Mobile Styles */
@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    .hero h1 {
        font-size: 1.5rem;
        line-height: 1.2;
    }
    
    .hero p {
        font-size: 0.9rem;
        line-height: 1.4;
    }
    
    .navbar-brand {
        font-size: 1.1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .card {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .card h3 {
        font-size: 1.1rem;
    }
    
    .btn {
        padding: 12px 15px;
        font-size: 0.9rem;
        width: 100%;
        margin-bottom: 10px;
    }
    
    .form-control {
        padding: 12px;
        font-size: 16px;
    }
    
    .form-group label {
        font-size: 0.9rem;
        margin-bottom: 5px;
    }
    
    .hero {
        padding: 30px 0;
    }
    
    .feature-card {
        text-align: center;
        padding: 20px;
    }
    
    .feature-card i {
        font-size: 2rem;
        margin-bottom: 15px;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
        margin-bottom: 10px;
    }
}

/* Animation for mobile menu */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dashboard Specific Styles */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

/* Dashboard Mobile Styles */
@media (max-width: 768px) {
    .dashboard-actions {
        flex-direction: column;
        gap: 15px;
    }
    
    .dashboard-actions .btn {
        width: 100%;
        padding: 15px;
    }
    
    .recent-tests {
        overflow-x: auto;
    }
    
    .recent-tests table {
        min-width: 500px;
    }
}

/* Auth Pages Mobile */
@media (max-width: 768px) {
    .auth-page .container {
        padding: 15px;
    }
    
    .auth-page .card {
        padding: 25px;
        margin: 20px 0;
    }
    
    .auth-page h2 {
        font-size: 1.4rem;
        text-align: center;
        margin-bottom: 25px;
    }
    
    .auth-page .form-group {
        margin-bottom: 20px;
    }
    
    .auth-page .form-control {
        padding: 12px;
        font-size: 16px;
    }
    
    .auth-page .btn {
        width: 100%;
        padding: 15px;
        margin-top: 15px;
    }
}

/* Table Responsive */
@media (max-width: 768px) {
    .table-responsive {
        overflow-x: auto;
    }
    
    table {
        min-width: 600px;
        font-size: 14px;
    }
}

/* Flash Messages Mobile */
@media (max-width: 768px) {
    .flash-message {
        margin: 15px;
        padding: 15px;
        border-radius: 5px;
        font-size: 14px;
    }
}

.stat-card {
    background: white;
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--secondary-100);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-800);
}

.stat-label {
    color: var(--secondary-600);
    font-size: 0.875rem;
    margin-top: var(--spacing-1);
}

/* Authentication Pages */
.auth-container {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-50), var(--secondary-50));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
}

.auth-card {
    background: white;
    padding: var(--spacing-8);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.auth-header h1 {
    color: var(--secondary-800);
    margin-bottom: var(--spacing-2);
}

.auth-header p {
    color: var(--secondary-600);
    margin-bottom: 0;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-6);
    margin: var(--spacing-12) 0;
}

.feature-card {
    text-align: center;
    padding: var(--spacing-8);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-100);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
    font-size: 2rem;
    color: var(--primary-600);
}

/* Testimonials */
.testimonials {
    background: var(--secondary-50);
    padding: var(--spacing-12) 0;
}

.testimonial-card {
    background: white;
    padding: var(--spacing-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    background: var(--primary-600);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-4);
    font-weight: 600;
    font-size: 1.25rem;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--secondary-200);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary-600);
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal);
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

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

.slide-up {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}