/* 
  EdTech Navigator - Modern Glassmorphism CSS 
*/

:root {
  /* Color Palette - Bright, Clean Light Theme */
  --color-bg-base: #fafafa;
  --color-bg-surface: #ffffff;
  --color-bg-glass: rgba(255, 255, 255, 0.75);
  --color-border-glass: rgba(255, 255, 255, 0.5);
  
  --color-text-main: #1f2937;
  --color-text-muted: #6b7280;
  
  --color-primary: #6366f1; /* Indigo */
  --color-primary-hover: #4f46e5;
  --color-secondary: #0ea5e9; /* Light Blue */
  --color-accent: #f43f5e; /* Rose */
  
  --gradient-1: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%); /* Indigo to Purple */
  --gradient-2: linear-gradient(135deg, #0284c7 0%, #059669 100%); /* Blue to Teal */
  --gradient-3: linear-gradient(135deg, #d97706 0%, #e11d48 100%); /* Amber to Rose */
  --gradient-text: linear-gradient(to right, #4f46e5, #9333ea);
  
  /* Typography */
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  
  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Radii */
  --radius-md: 0.75rem;
  --radius-lg: 1.25rem;
  --radius-full: 9999px;
  
  /* Shadows & Transitions */
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-base);
  color: var(--color-text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Animated Shapes */
.bg-shape {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.2;
  animation: float 20s infinite alternate;
}

.bg-shape-1 {
  width: 500px;
  height: 500px;
  background: var(--color-primary);
  top: -10%;
  left: -10%;
}

.bg-shape-2 {
  width: 400px;
  height: 400px;
  background: var(--color-secondary);
  bottom: 10%;
  right: -5%;
  animation-delay: -10s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-sm {
  max-width: 800px;
}

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

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: 1.5rem;
}

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

.large-text {
  font-size: 1.125rem;
}

.text-gradient {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h1 span {
  display: block;
  background: linear-gradient(to right, #38bdf8, #4f46e5, #9333ea);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glassmorphism Classes */
.glass-effect {
  background: var(--color-bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-border-glass);
  box-shadow: var(--shadow-glass);
  border-top: 1px solid rgba(255, 255, 255, 0.8);
  border-left: 1px solid rgba(255, 255, 255, 0.8);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border-glass);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  padding: 0.75rem 0;
  background: rgba(255, 255, 255, 0.9); /* Lighter on scroll */
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 48px;
  width: auto;
  object-fit: contain;
}



.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
}

.btn-primary {
  background: var(--gradient-1);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary {
  background: var(--color-bg-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-border-glass);
}

.btn-secondary:hover {
  background: #f3f4f6;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-text-main);
  padding: 0.5rem 1.25rem;
}

.btn-outline:hover {
  background: rgba(99, 102, 241, 0.1);
}

.btn-block {
  width: 100%;
}

/* Sections */
.section {
  padding: var(--spacing-xl) 0;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 992px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
  }
}

.badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(99, 102, 241, 0.05);
  border: 1px solid rgba(99, 102, 241, 0.15);
  color: #4f46e5;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

/* Hero Visual Decoration */
.hero-visual {
  position: relative;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.visual-card {
  padding: 2rem;
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 1;
}

.stats-row {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--color-border-glass);
  padding-bottom: 1.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-main);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.mockup-lines .line {
  height: 12px;
  background: #e5e7eb;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.w-100 { width: 100%; }
.w-80 { width: 80%; }
.w-60 { width: 60%; }

/* Providers Section */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.provider-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

/* Provider Cards (Kästen) */
.provider-card {
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.provider-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-text);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.provider-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
}

.provider-card:hover::before {
  opacity: 1;
}

.provider-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.provider-logo {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.5rem;
  color: white;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.bg-gradient-1 { background: var(--gradient-1); }
.bg-gradient-2 { background: var(--gradient-2); }
.bg-gradient-3 { background: var(--gradient-3); }

.provider-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: var(--radius-full);
  color: var(--color-text-main);
  font-weight: 500;
}

.provider-body {
  flex-grow: 1;
}

.provider-features {
  list-style: none;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}

.provider-features li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-check {
  font-style: normal;
  color: #10b981;
  font-weight: bold;
}

.provider-footer {
  margin-top: auto;
}

/* Categories Section */
.glass-section {
  background: linear-gradient(to right, rgba(255, 255, 255, 0.6), rgba(255, 255, 255, 0.8));
  border-top: 1px solid var(--color-border-glass);
  border-bottom: 1px solid var(--color-border-glass);
}

.category-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
}

.cat-badge {
  padding: 0.75rem 1.5rem;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-glass);
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: all var(--transition-fast);
  cursor: default;
}

.cat-badge:hover {
  background: var(--color-primary);
  color: white;
  transform: scale(1.05);
  border-color: var(--color-primary);
}

/* Secondary Pages Container */
.page-content {
  padding-top: 8rem;
  min-height: calc(100vh - 300px);
}

.page-box {
  background: var(--color-bg-surface);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-glass);
  box-shadow: var(--shadow-glass);
  margin-top: 2rem;
}

.page-box h3, .page-box h4 {
  color: var(--color-text-main);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.page-box h3:first-child {
  margin-top: 0;
}

.page-box p {
  color: var(--color-text-main);
  margin-bottom: 1.5rem;
}

.page-box p:last-child {
  margin-bottom: 0;
}

.about-features-list {
  list-style: none;
  padding: 0;
  margin-bottom: 2rem;
}

.about-features-list li {
  color: var(--color-text-main);
  margin-bottom: 0.75rem;
  padding-left: 0.5rem;
}

.about-features-list strong {
  color: var(--color-text-heading);
}

.page-box a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.page-box a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

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

.mt-4 {
  margin-top: 2rem;
}

/* Impressum Section (kept for fallback) */
.impressum-content {
  background: var(--color-bg-surface);
  padding: 3rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-glass);
  box-shadow: var(--shadow-glass);
  margin-top: 2rem;
}

.impressum-content p {
  color: var(--color-text-main);
  margin-bottom: 1.5rem;
}

.impressum-content p:last-child {
  margin-bottom: 0;
}

.impressum-content a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.impressum-content a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

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

/* Contact Form Styles */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-text-main);
  font-weight: 600;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-glass);
  background: var(--color-bg-base);
  color: var(--color-text-main);
  font-family: inherit;
  font-size: 1rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  background: var(--color-bg-surface);
}

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

.form-status {
  padding: 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
}

.form-status.success {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-status.error {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Footer Focus Setup */
.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  background: #f8fafc;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 3rem;
  margin-bottom: 3rem;
}

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

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}

.link-group h4 {
  color: var(--color-text-main);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.link-group a {
  display: block;
  color: var(--color-text-muted);
  text-decoration: none;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-glass);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 30px;
  height: 20px;
  position: relative;
  z-index: 1001;
}

.mobile-menu-btn span {
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-main);
  left: 0;
  transition: all var(--transition-fast);
}

.mobile-menu-btn span:nth-child(1) { top: 0; }
.mobile-menu-btn span:nth-child(2) { top: 9px; }
.mobile-menu-btn span:nth-child(3) { bottom: 0; }

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 250px;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid rgba(0, 0, 0, 0.05);
    flex-direction: column;
    justify-content: center;
    transition: right var(--transition-normal);
  }
  
  .nav-links.active {
    right: 0;
  }
}

/* Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

.rotate-in {
  opacity: 0;
  transform: perspective(1000px) rotateY(-20deg) rotateX(10deg);
  transition: opacity 1s ease, transform 1s ease;
  transform-style: preserve-3d;
}

.rotate-in.visible {
  opacity: 1;
  transform: perspective(1000px) rotateY(0) rotateX(0);
}