/* ============================================
   BKG KI in der Box – Modern Design (Tabs.com Inspired)
   ============================================ */

/* Import Inter Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* CSS Custom Properties */
:root {
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-h1: clamp(36px, 6vw, 64px);
  --font-size-h2: clamp(28px, 4.5vw, 48px);
  --font-size-h3: clamp(20px, 3.5vw, 32px);
  --font-size-body: 17px;
  --font-size-small: 16px;

  /* Colors */
  --color-text-primary: #0A0A0A;
  --color-text-secondary: #6B7280;
  --color-bg-primary: #FFFFFF;
  --color-bg-secondary: #F9FAFB;
  --color-accent-primary: #0066FF;
  --color-accent-hover: #0052CC;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --color-success: #10B981;
  --color-error: #EF4444;
  --color-text-tertiary: #9CA3AF;

  /* Spacing */
  --spacing-xs: 0.5rem;
  /* 8px */
  --spacing-sm: 1rem;
  /* 16px */
  --spacing-md: 1.5rem;
  /* 24px */
  --spacing-lg: 2rem;
  /* 32px */
  --spacing-xl: 3rem;
  /* 48px */
  --spacing-2xl: 4rem;
  /* 64px */
  --spacing-3xl: 6rem;
  /* 96px */
  --spacing-4xl: 8rem;
  /* 128px */

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: 1.7;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: 800;
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Utility */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width:768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: var(--transition-base);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  min-height: 72px;
}

.logo a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
}

.logo a:hover {
  opacity: 0.7;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  z-index: 1001;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  position: relative;
  transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  bottom: -7px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg) translate(5px, -5px);
}

.main-nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-weight: 500;
  font-size: 15px;
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
}

@media (max-width:768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-primary);
    flex-direction: column;
    padding: 100px var(--spacing-xl) var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: right var(--transition-slow);
    gap: var(--spacing-md);
    align-items: flex-start;
  }

  .main-nav.active {
    right: 0;
  }

  .nav-link {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: 16px;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 16px;
  border: none;
  cursor: pointer;
  text-align: center;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

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

.btn-secondary {
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-text-primary);
  color: var(--color-text-primary);
  transform: translateY(-1px);
}

/* Accessible focus states */
.btn:focus,
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.2), var(--shadow-md);
}

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

/* Explicit pointer for obvious interactive items */
.nav-link { cursor: pointer; }

/* Hero Section */
.hero {
  background: var(--color-bg-primary);
  padding: var(--spacing-2xl) 0 var(--spacing-2xl);
  position: relative;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

/* If a hero image exists, switch to two columns on larger screens */
@media (min-width: 900px) {
  .hero .container:has(.hero-image) {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width:768px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

.hero-content {
  max-width: 640px;
  animation: fadeInUp 0.6s ease;
}

.hero h1 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 800;
}

.hero p {
  font-size: clamp(16px, 2.5vw, 18px);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.hero-image {
  width: 100%;
  max-width: 560px;
  height: 320px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  animation: fadeInUp 0.6s ease 0.2s both;
  border-radius: var(--radius-lg);
}

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

@media (min-width:768px) {
  section {
    padding: var(--spacing-2xl) 0;
  }
}

.section-alt {
  background: var(--color-bg-secondary);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.section-title h2 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.section-title p {
  font-size: 20px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

/* Force 2x2 layout for 4-card groups on desktop */
@media (min-width: 768px) {
  .cards--2x2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border-light);
  transition: var(--transition-base);
}

.card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.icon-circle {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  transition: transform var(--transition-base);
}

.card:hover .icon-circle {
  transform: scale(1.05);
}

.icon-1 {
  background: #E6F0FF;
}

.icon-2 {
  background: #FEF3F2;
}

.icon-3 {
  background: #ECFDF5;
}

.icon-4 {
  background: #FEF9C3;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.card p {
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

/* Pricing Cards */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

@media (max-width:1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

.price-card {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  border: 1.5px solid var(--color-border-light);
  text-align: left;
  transition: var(--transition-base);
}

.price-card.highlight {
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.price-card.highlight::before {
  content: 'Beliebt';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent-primary);
  color: white;
  padding: 4px 16px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
}

.price-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.price-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-text-primary);
  margin: var(--spacing-md) 0;
  letter-spacing: -0.02em;
}

.price span {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.features-list {
  list-style: none;
  margin: var(--spacing-xl) 0;
}

.features-list li {
  padding: var(--spacing-sm) 0;
  padding-left: 28px;
  position: relative;
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.5;
}

.features-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
  font-size: 18px;
}

.small-text {
  font-size: 14px;
  color: var(--color-text-tertiary);
  margin-top: var(--spacing-md);
}

/* Timeline */
.timeline {
  max-width: 900px;
  margin: var(--spacing-xl) auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-step {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  z-index: 1;
}

.step-content {
  flex: 1;
  background: var(--color-bg-primary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  transition: var(--transition-base);
}

.step-content:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.step-content h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.step-content p {
  font-size: 16px;
  color: var(--color-text-secondary);
}

/* FAQ */
.faq-list {
  max-width: 900px;
  margin: var(--spacing-xl) auto;
}

.faq-item {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--color-border-light);
  overflow: hidden;
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: var(--color-border);
}

.faq-question {
  padding: var(--spacing-lg);
  font-weight: 600;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg-secondary);
}

.faq-question::after {
  content: '+';
  font-size: 24px;
  font-weight: 300;
  transition: transform var(--transition-base);
  color: var(--color-text-secondary);
  flex-shrink: 0;
  margin-left: var(--spacing-md);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
  padding: 0 var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: 16px;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 var(--spacing-lg) var(--spacing-lg);
}

/* Contact Form */
.contact-form {
  max-width: 600px;
  margin: var(--spacing-xl) auto;
  background: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border-light);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 16px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.form-message {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  display: none;
  font-size: 15px;
}

.form-message.success {
  background: #ECFDF5;
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.form-message.error {
  background: #FEF2F2;
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* Footer */
.site-footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--spacing-3xl) 0 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 h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  font-size: 16px;
  font-weight: 600;
}

.footer-section p,
.footer-section a {
  color: var(--color-text-secondary);
  font-size: 15px;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--spacing-lg);
  text-align: center;
}

/* Responsive Adjustments */
@media (max-width:768px) {
  .hero-image {
    height: 300px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
  }

  section {
    padding: var(--spacing-2xl) 0;
  }
}

/* Table Styles */

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
}

thead {
  background: var(--color-bg-secondary);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border);
}

td {
  padding: var(--spacing-md);
  font-size: 15px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border-light);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: var(--color-bg-secondary);
}

/* Popup Modal for Quick Inquiry */

.inquiry-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.inquiry-modal.active {
  display: flex;
  opacity: 1;
}

.inquiry-modal-content {
  background: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: transform var(--transition-base);
  position: relative;
}

.inquiry-modal.active .inquiry-modal-content {
  transform: scale(1);
}

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

.inquiry-modal-header h3 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--color-text-primary);
}

.inquiry-modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.inquiry-modal-close:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
}

.inquiry-product-info {
  background: var(--color-accent-light);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  border-left: 3px solid var(--color-accent-primary);
}

.inquiry-product-info p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.inquiry-product-info strong {
  color: var(--color-text-primary);
  font-size: 16px;
  display: block;
  margin-bottom: var(--spacing-xs);
}

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

.inquiry-form .form-group:last-of-type {
  margin-bottom: var(--spacing-lg);
}

.inquiry-form label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text-primary);
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 15px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

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

.inquiry-form-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

.inquiry-success {
  display: none;
  text-align: center;
  padding: var(--spacing-xl);
}

.inquiry-success.active {
  display: block;
}