/* Klugeschule.de - Hauptstylesheet */
/* Basierend auf beste.schule Design mit LR-Farbschema */

:root {
    /* Primäre Farben - Inspiriert von Learning Room */
    --primary-blue: #2563eb;        /* Hauptblau */
    --primary-blue-light: #3b82f6;  /* Helleres Blau */
    --primary-blue-dark: #1d4ed8;   /* Dunkleres Blau */
    
    /* Akzentfarben */
    --accent-green: #10b981;        /* Erfolgsgrün */
    --accent-orange: #f59e0b;       /* Warnorange */
    --accent-red: #ef4444;          /* Fehlerrot */
    
    /* Neutrale Farben */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Text */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-700);
    --text-muted: var(--gray-500);
    
    /* Background */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-accent: var(--primary-blue);
    
    /* Schriftarten */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: Georgia, Cambria, "Times New Roman", Times, serif;
    
    /* Abstände */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
}

/* Scroll Animations */
@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* Animation classes */
.animate-on-scroll {
    opacity: 0;
    transition: all 0.6s ease;
}

.animate-on-scroll.animate {
    opacity: 1;
}

.slide-left {
    animation: slideInFromLeft 0.8s ease-out forwards;
}

.slide-right {
    animation: slideInFromRight 0.8s ease-out forwards;
}

.fade-scale {
    animation: fadeInScale 0.8s ease-out forwards;
}


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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    padding-top: 100px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
    color: var(--text-primary);
}

h2 {
    font-size: 2.25rem;
    color: var(--text-primary);
}

h3 {
    font-size: 1.875rem;
    color: var(--text-secondary);
}

h4 {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Links */
a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

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

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

/* Header */
.header {
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 100px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    height: 100px;
    flex-wrap: nowrap;
}

.navbar-brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: auto;
    flex-shrink: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-right: var(--spacing-xl);
    flex-shrink: 0;
}

.logo img {
    display: block;
    transition: opacity 0.2s ease;
    border-radius: var(--radius-sm);
    transform: translateY(8px);
}

.logo a {
    display: flex !important;
    align-items: center !important;
    gap: var(--spacing-md) !important;
    white-space: nowrap !important;
}

.logo a:hover img {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
    flex-wrap: nowrap;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-blue);
    background-color: var(--gray-50);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
    margin-left: var(--spacing-md);
}

/* Medium screens - reduce spacing */
@media (max-width: 1024px) {
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .logo {
        margin-right: var(--spacing-lg);
    }
    
    .logo span {
        font-size: 1.25rem;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .navbar {
        position: relative;
    }
    
    .navbar-brand {
        width: 100%;
        justify-content: space-between;
    }
    
    .logo {
        margin-right: 0;
    }
    
    .logo img {
        width: 80px;
        height: 80px;
    }
    
    .logo span {
        font-size: 1.25rem;
    }
    
    .nav-links {
        position: fixed;
        top: 100px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-lg) 0;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
        padding: var(--spacing-md) 0;
        border-bottom: 1px solid var(--gray-200);
    }
    
    .nav-links li:last-child {
        border-bottom: none;
        padding-top: var(--spacing-lg);
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    /* Hero mobile adjustments */
    .hero h1 {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero p {
        font-size: 1.1rem;
        padding: 0 var(--spacing-md);
    }
    
    .hero .btn {
        display: block;
        margin: var(--spacing-sm) auto;
        max-width: 280px;
    }
    
    /* Feature cards mobile */
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .feature-card {
        margin: 0 var(--spacing-md);
    }
    
    /* Disable intensive animations on mobile */
    .feature-card:hover {
        transform: translateY(-4px) scale(1.02);
    }
    
    .feature-card:hover .feature-icon {
        transform: scale(1.05);
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    color: white;
    box-shadow: 0 4px 15px rgba(96, 165, 250, 0.4);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(96, 165, 250, 0.6);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 1);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    position: relative;
    color: white;
    height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero h1 {
    color: white;
    font-size: 3.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 800;
    animation: fadeInUp 1s ease-out;
}

.hero p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero .btn {
    animation: fadeInUp 1s ease-out 0.4s both;
}

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

/* Stats Section */
.stats {
    background: var(--bg-secondary);
    padding: var(--spacing-3xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
}

.stat-item p {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Features Section */
.features {
    padding: var(--spacing-3xl) 0;
    background: #ffffff;
    position: relative;
    z-index: 10;
    margin-top: 0;
}

.features .text-center {
    margin-bottom: var(--spacing-2xl);
}

.features h2 {
    color: var(--text-primary);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-xl);
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.feature-card:hover::before {
    left: 100%;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    background: rgba(255, 255, 255, 0.95);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 2rem;
    transition: all 0.3s ease;
    position: relative;
    z-index: 1;
}

.feature-card:hover .feature-icon {
    transform: rotateY(360deg);
    background: linear-gradient(135deg, #3b82f6, #2563eb);
}

/* Pricing Section */
.pricing {
    background: var(--bg-secondary);
    padding: var(--spacing-3xl) 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.pricing-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s ease;
}

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

.pricing-card.featured {
    border: 2px solid var(--primary-blue);
    transform: scale(1.05);
}

.pricing-header {
    background: var(--primary-blue);
    color: white;
    padding: var(--spacing-xl);
    text-align: center;
}

.pricing-card.featured .pricing-header {
    background: var(--primary-blue-dark);
}

.pricing-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.pricing-price {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.pricing-period {
    opacity: 0.9;
    font-size: 1rem;
}

.pricing-body {
    padding: var(--spacing-xl);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.pricing-features li {
    padding: var(--spacing-sm) 0;
    display: flex;
    align-items: center;
}

.pricing-features li:before {
    content: "✓";
    color: var(--accent-green);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

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

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

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: white;
    padding: var(--spacing-2xl) 0;
    text-align: center;
}

.footer p {
    color: var(--gray-300);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.footer-links a {
    color: var(--gray-300);
    transition: color 0.2s ease;
}

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

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .navbar {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-links {
        gap: var(--spacing-md);
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.125rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .features-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-item h3 {
        font-size: 2rem;
    }
}

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

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

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

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.grid { display: grid; }

/* Subjects Section Specific Styling */
.subjects-section {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    padding: var(--spacing-3xl) 0;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.subject-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: var(--spacing-xl);
    border-radius: 25px;
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.subject-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    transform: scale(0);
    transition: transform 0.6s ease;
}

.subject-card:hover::before {
    transform: scale(1);
}

.subject-card:hover {
    transform: translateY(-12px) rotateY(5deg);
    box-shadow: 0 25px 50px rgba(0,0,0,0.15);
    background: rgba(255, 255, 255, 1);
}

.subject-icon {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 2.5rem;
    color: white;
    transition: all 0.4s ease;
    position: relative;
    z-index: 2;
}

.subject-card:hover .subject-icon {
    transform: scale(1.1) rotateY(180deg);
}

.subject-card h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    position: relative;
    z-index: 2;
}

.subject-features {
    text-align: left;
    margin-top: var(--spacing-lg);
    list-style: none;
    padding: 0;
    position: relative;
    z-index: 2;
}

.subject-features li {
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    transition: transform 0.2s ease;
}

.subject-features li:hover {
    transform: translateX(5px);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    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="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.05)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}