/* 
 * M2Deutsch - Main Stylesheet
 * A responsive CSS for the German language exam simulation platform
 */

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

:root {
    /* Color Variables */
    --primary-color: #1a4b84;
    --secondary-color: #f5a742;
    --accent-color: #4ECDC4;
    --background-color: #f5f7fa;
    --text-color: #333;
    --light-text: #767676;
    --border-color: #e1e4e8;
    --card-bg: #fff;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* Typography */
    --font-family: 'Inter', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.5;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.1);
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

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

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

a:hover {
    color: var(--secondary-color);
}

/* Header */
.site-header {
    background-color: white;

    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.main-nav ul {
    display: flex;
    list-style: none;
}

.main-nav li {
    margin-left: var(--spacing-lg);
}

.main-nav a {
    color: var(--text-color);
    font-weight: 500;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.auth-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
}

/* Main Content */
main {
    padding-top: 70px;
    min-height: calc(100vh - 300px);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: darken(var(--primary-color), 10%);
    color:  var(--secondary-color);
}

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

.btn-secondary:hover {
    background-color: darken(var(--secondary-color), 10%);
    color: var(--secondary-color);
}

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

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
    min-height: 800px;
    display: flex;
    align-items: center;
    background-image: url('../img/background.jpg');
    background-size: cover;
    background-position: center;
}

.hero-content {
    max-width: 600px;
    position: relative;
    z-index: 1;
    color: var(--text-color);
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xl);
}

.exam-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.cta-button {
    margin-top: var(--spacing-lg);
}

/* Features Section */
.features-section {
    padding: var(--spacing-xxl) 0;
    background-color: white;
}

.features-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-card .icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
}

/* Subscription Section */
.subscription-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--background-color);
}

.subscription-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.subscription-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.subscription-card {
    background-color: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.subscription-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.subscription-card.highlighted {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.subscription-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.subscription-card .price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.subscription-card .price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--light-text);
}

.subscription-card ul {
    list-style: none;
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.subscription-card li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.subscription-card li:before {
    content: "✓";
    color: var(--success-color);
    margin-right: var(--spacing-sm);
}

.subscription-card li.disabled {
    color: var(--light-text);
}

.subscription-card li.disabled:before {
    content: "✕";
    color: var(--light-text);
}

/* Testimonials Section */
.testimonials-section {
    padding: var(--spacing-xxl) 0;
    background-color: white;
}

.testimonials-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.testimonials-slider {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    gap: var(--spacing-lg);
    scrollbar-width: none; /* Firefox */
    padding-bottom: var(--spacing-md);
}

.testimonials-slider::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.testimonial {
    scroll-snap-align: start;
    min-width: 300px;
    flex: 1;
    background-color: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.testimonial .quote {
    font-style: italic;
    margin-bottom: var(--spacing-md);
}

.testimonial .author {
    font-weight: 600;
    color: var(--primary-color);
}

/* Auth Section */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 70px);
    padding: var(--spacing-xl) 0;
    background-image: url(../img/background.jpg);
    background-size: cover;
    background-position: center;
}

.auth-box {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 500px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    
}

.auth-tabs {
    display: flex;
    background-color: var(--background-color);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-md);
    text-align: center;
    background-color: transparent;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--light-text);
    transition: all var(--transition-fast);
}

.auth-tab.active {
    background-color: var(--card-bg);
    color: var(--primary-color);
}

.auth-content {
    padding: var(--spacing-xl);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    border-color: var(--primary-color);
    outline: none;
}

.checkbox {
    display: flex;
    align-items: center;
}

.checkbox input {
    margin-right: var(--spacing-sm);
}

.forgot-password {
    text-align: center;
    margin-top: var(--spacing-md);
}

/* Footer */
.site-footer {
    background-color: var(--primary-color);
    color: white;
    padding-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-section.links ul {
    list-style: none;
}

.footer-section.links li {
    margin-bottom: var(--spacing-sm);
}

.footer-section.links a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-section.links a:hover {
    color: white;
}

.footer-section.contact p {
    margin-bottom: var(--spacing-md);
}

.footer-section.contact i {
    margin-right: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: background-color var(--transition-fast);
}

.social-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md) 0;
    text-align: center;
}

/* Alert Messages */
.alert {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--border-radius-sm);
}

.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background-color: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.alert-info {
    background-color: rgba(23, 162, 184, 0.1);
    border: 1px solid var(--info-color);
    color: var(--info-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    overflow-y: auto;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 10% auto;
    width: 90%;
    max-width: 500px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

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

.modal-header h3 {
    margin-bottom: 0;
}

.close-modal {
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .auth-buttons {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .exam-buttons {
        flex-direction: column;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .features-grid,
    .subscription-grid {
        grid-template-columns: 1fr;
    }
    
    .subscription-card.highlighted {
        transform: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .auth-box {
        max-width: 100%;
        margin: 10px;
    }
    
    .modal-content {
        margin: 5% auto;
        width: 95%;
    }
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: var(--shadow-sm);
    z-index: 990;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu li {
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu a {
    display: block;
    padding: var(--spacing-md);
    color: white;
    font-weight: 500;
}

.mobile-menu-auth {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mt-5 { margin-top: var(--spacing-xxl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.mb-5 { margin-bottom: var(--spacing-xxl); }

.ml-0 { margin-left: 0; }
.ml-1 { margin-left: var(--spacing-sm); }
.ml-2 { margin-left: var(--spacing-md); }
.ml-3 { margin-left: var(--spacing-lg); }
.ml-4 { margin-left: var(--spacing-xl); }
.ml-5 { margin-left: var(--spacing-xxl); }

.mr-0 { margin-right: 0; }
.mr-1 { margin-right: var(--spacing-sm); }
.mr-2 { margin-right: var(--spacing-md); }
.mr-3 { margin-right: var(--spacing-lg); }
.mr-4 { margin-right: var(--spacing-xl); }
.mr-5 { margin-right: var(--spacing-xxl); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }
.p-5 { padding: var(--spacing-xxl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }

.flex-column { flex-direction: column; }
.justify-center { justify-content: center; }
.align-center { align-items: center; }
.flex-grow { flex-grow: 1; }

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

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

.fade-in {
    animation: fadeIn var(--transition-normal);
}

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

.slide-up {
    animation: slideUp var(--transition-normal);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}