/* DCG.de AI Platform - Haupt-Stylesheet */

:root {
  /* Primäre Farbpalette */
  --primary-color: #3498db;
  --primary-light: #5dade2;
  --primary-dark: #2980b9;
  --primary-bg: #ebf5fb;
  
  /* Sekundäre Farbpalette */
  --secondary-color: #2ecc71;
  --secondary-light: #58d68d;
  --secondary-dark: #27ae60;
  --secondary-bg: #e9f7ef;
  
  /* Neutrale Farben */
  --neutral-100: #f8f9fa;
  --neutral-200: #e9ecef;
  --neutral-300: #dee2e6;
  --neutral-400: #ced4da;
  --neutral-500: #adb5bd;
  --neutral-600: #6c757d;
  --neutral-700: #495057;
  --neutral-800: #343a40;
  --neutral-900: #212529;
  
  /* Akzentfarben */
  --accent-success: #28a745;
  --accent-info: #17a2b8;
  --accent-warning: #ffc107;
  --accent-danger: #dc3545;
  
  /* Typografie */
  --font-main: 'Open Sans', 'Segoe UI', Roboto, -apple-system, sans-serif;
  --font-headings: 'Poppins', 'Segoe UI', -apple-system, sans-serif;
  --font-mono: 'Roboto Mono', Menlo, Monaco, Consolas, monospace;
  
  /* Layout */
  --container-max-width: 1200px;
  --container-padding: 15px;
  --section-spacing: 60px;
  --card-border-radius: 8px;
  --button-border-radius: 4px;
  --transition-speed: 0.3s;
  
  /* 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), 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1), 0 5px 10px rgba(0, 0, 0, 0.05);
}

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

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

body {
  font-family: var(--font-main);
  line-height: 1.6;
  color: var(--neutral-800);
  background-color: var(--neutral-100);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  padding-bottom: var(--section-spacing);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headings);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--neutral-900);
}

h1 {
  font-size: 2.5rem;
  margin-top: 1.5rem;
}

h2 {
  font-size: 2rem;
  margin-top: 1.25rem;
}

h3 {
  font-size: 1.75rem;
  margin-top: 1rem;
}

h4 {
  font-size: 1.5rem;
  margin-top: 0.75rem;
}

h5 {
  font-size: 1.25rem;
  margin-top: 0.5rem;
}

h6 {
  font-size: 1rem;
  margin-top: 0.25rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed) ease-in-out;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

.section-title {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title h2 {
  margin-bottom: 0.5rem;
}

.section-title p {
  color: var(--neutral-600);
  font-size: 1.125rem;
}

/* Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -15px;
}

.col {
  flex: 1 0 0%;
  padding: 0 15px;
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-5 { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* Header */
.site-header {
  background-color: white;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 1rem 0;
}

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

.navbar-brand {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-right: 2rem;
}

.navbar-brand img {
  height: 40px;
  margin-right: 0.75rem;
}

.navbar-nav {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-item {
  position: relative;
  margin: 0 0.5rem;
}

.nav-link {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--neutral-700);
  font-weight: 500;
  transition: color var(--transition-speed) ease-in-out;
}

.nav-link:hover {
  color: var(--primary-color);
  text-decoration: none;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -0.25rem;
  left: 0.75rem;
  right: 0.75rem;
  height: 2px;
  background-color: var(--primary-color);
}

.navbar-right {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.lang-selector {
  position: relative;
  margin-left: 1rem;
}

.lang-selector-toggle {
  display: flex;
  align-items: center;
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--neutral-700);
  font-weight: 500;
  cursor: pointer;
}

.lang-selector-toggle:hover {
  color: var(--primary-color);
}

.lang-selector-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 1000;
  min-width: 10rem;
  padding: 0.5rem 0;
  background-color: white;
  border-radius: var(--card-border-radius);
  box-shadow: var(--shadow-md);
  display: none;
}

.lang-selector.active .lang-selector-dropdown {
  display: block;
}

.lang-option {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--neutral-700);
  text-decoration: none;
}

.lang-option:hover {
  background-color: var(--neutral-100);
  color: var(--primary-color);
  text-decoration: none;
}

.lang-option.active {
  color: var(--primary-color);
  font-weight: 600;
}

/* Auth Buttons */
.auth-buttons {
  display: flex;
  gap: 0.75rem;
  margin-left: 1rem;
}

.auth-btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--button-border-radius);
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-speed) ease-in-out;
  text-decoration: none;
}

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

.auth-btn-login:hover {
  background-color: var(--primary-dark);
  color: white;
  text-decoration: none;
}

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

.auth-btn-register:hover {
  background-color: var(--secondary-dark);
  color: white;
  text-decoration: none;
}

.auth-btn-logout {
  background-color: var(--accent-danger);
  color: white;
}

.auth-btn-logout:hover {
  background-color: #bd2130;
  color: white;
  text-decoration: none;
}

/* Cards */
.card {
  background-color: white;
  border-radius: var(--card-border-radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 1.5rem;
  transition: transform var(--transition-speed) ease-in-out, box-shadow var(--transition-speed) ease-in-out;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--neutral-200);
  background-color: var(--neutral-100);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--neutral-200);
  background-color: var(--neutral-100);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.card-text {
  color: var(--neutral-700);
}

/* Buttons */
.btn {
  display: inline-block;
  font-weight: 500;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  padding: 0.5rem 1.25rem;
  border-radius: var(--button-border-radius);
  border: 1px solid transparent;
  transition: all var(--transition-speed) ease-in-out;
  text-decoration: none;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  color: white;
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--secondary-dark);
  border-color: var(--secondary-dark);
  color: white;
  text-decoration: none;
}

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

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
}

.btn-success {
  background-color: var(--accent-success);
  border-color: var(--accent-success);
  color: white;
}

.btn-success:hover {
  background-color: #218838;
  border-color: #1e7e34;
  color: white;
  text-decoration: none;
}

.btn-danger {
  background-color: var(--accent-danger);
  border-color: var(--accent-danger);
  color: white;
}

.btn-danger:hover {
  background-color: #c82333;
  border-color: #bd2130;
  color: white;
  text-decoration: none;
}

.btn-sm {
  padding: 0.25rem 0.75rem;
  font-size: 0.875rem;
  border-radius: calc(var(--button-border-radius) - 1px);
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.125rem;
  border-radius: calc(var(--button-border-radius) + 1px);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--neutral-700);
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  color: var(--neutral-800);
  background-color: white;
  background-clip: padding-box;
  border: 1px solid var(--neutral-300);
  border-radius: var(--button-border-radius);
  transition: border-color var(--transition-speed) ease-in-out, box-shadow var(--transition-speed) ease-in-out;
}

.form-control:focus {
  color: var(--neutral-900);
  background-color: white;
  border-color: var(--primary-light);
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.form-control::placeholder {
  color: var(--neutral-500);
  opacity: 1;
}

.form-text {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--neutral-600);
}

.form-select {
  display: block;
  width: 100%;
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--neutral-800);
  background-color: white;
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px 12px;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
  border: 1px solid var(--neutral-300);
  border-radius: var(--button-border-radius);
  appearance: none;
}

.form-select:focus {
  border-color: var(--primary-light);
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.form-check {
  display: block;
  min-height: 1.5rem;
  padding-left: 1.5rem;
  margin-bottom: 0.125rem;
}

.form-check-input {
  position: absolute;
  margin-top: 0.25rem;
  margin-left: -1.5rem;
}

.form-check-label {
  margin-bottom: 0;
}

/* Alerts */
.alert {
  position: relative;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: var(--card-border-radius);
}

.alert-success {
  color: #155724;
  background-color: #d4edda;
  border-color: #c3e6cb;
}

.alert-danger {
  color: #721c24;
  background-color: #f8d7da;
  border-color: #f5c6cb;
}

.alert-warning {
  color: #856404;
  background-color: #fff3cd;
  border-color: #ffeeba;
}

.alert-info {
  color: #0c5460;
  background-color: #d1ecf1;
  border-color: #bee5eb;
}

/* Tables */
.table {
  width: 100%;
  margin-bottom: 1rem;
  color: var(--neutral-800);
  vertical-align: top;
  border-color: var(--neutral-300);
}

.table th,
.table td {
  padding: 0.75rem;
  vertical-align: top;
  border-bottom: 1px solid var(--neutral-300);
}

.table thead th {
  vertical-align: bottom;
  border-bottom: 2px solid var(--neutral-300);
  font-weight: 600;
}

.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: rgba(0, 0, 0, 0.05);
}

.table-hover tbody tr:hover {
  background-color: rgba(0, 0, 0, 0.075);
}

/* Footer */
.site-footer {
  background-color: var(--neutral-800);
  color: white;
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.footer-section {
  flex: 1;
  margin-bottom: 1.5rem;
  min-width: 250px;
  padding: 0 1rem;
}

.footer-section h4 {
  color: white;
  margin-bottom: 1.25rem;
  font-size: 1.25rem;
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section ul li {
  margin-bottom: 0.5rem;
}

.footer-section ul li a {
  color: var(--neutral-400);
  transition: color var(--transition-speed) ease-in-out;
}

.footer-section ul li a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid var(--neutral-700);
  color: var(--neutral-500);
  font-size: 0.875rem;
}

.social-icons {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--neutral-700);
  color: white;
  transition: all var(--transition-speed) ease-in-out;
}

.social-icon:hover {
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
}

/* Hero Section */
.hero-section {
  padding: 4rem 0;
  background-color: var(--primary-bg);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 0 1rem;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--neutral-900);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--neutral-700);
  margin-bottom: 2rem;
}

.hero-btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--button-border-radius);
  transition: all var(--transition-speed) ease-in-out;
  text-decoration: none;
  background-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

.hero-btn:hover {
  background-color: var(--primary-dark);
  color: white;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hero-image {
  max-width: 100%;
  margin-top: 2rem;
  border-radius: var(--card-border-radius);
  box-shadow: var(--shadow-lg);
}

/* Utilities */
.d-none { display: none !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }

.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.flex-row { flex-direction: row !important; }
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }
.flex-grow-1 { flex-grow: 1 !important; }

.justify-content-start { justify-content: flex-start !important; }
.justify-content-end { justify-content: flex-end !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.justify-content-around { justify-content: space-around !important; }

.align-items-start { align-items: flex-start !important; }
.align-items-end { align-items: flex-end !important; }
.align-items-center { align-items: center !important; }
.align-items-stretch { align-items: stretch !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mt-5 { margin-top: 3rem !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: 0.25rem !important; }
.mb-2 { margin-bottom: 0.5rem !important; }
.mb-3 { margin-bottom: 1rem !important; }
.mb-4 { margin-bottom: 1.5rem !important; }
.mb-5 { margin-bottom: 3rem !important; }

.ml-0 { margin-left: 0 !important; }
.ml-1 { margin-left: 0.25rem !important; }
.ml-2 { margin-left: 0.5rem !important; }
.ml-3 { margin-left: 1rem !important; }
.ml-4 { margin-left: 1.5rem !important; }
.ml-5 { margin-left: 3rem !important; }

.mr-0 { margin-right: 0 !important; }
.mr-1 { margin-right: 0.25rem !important; }
.mr-2 { margin-right: 0.5rem !important; }
.mr-3 { margin-right: 1rem !important; }
.mr-4 { margin-right: 1.5rem !important; }
.mr-5 { margin-right: 3rem !important; }

.mx-auto { margin-left: auto !important; margin-right: auto !important; }

.pt-0 { padding-top: 0 !important; }
.pt-1 { padding-top: 0.25rem !important; }
.pt-2 { padding-top: 0.5rem !important; }
.pt-3 { padding-top: 1rem !important; }
.pt-4 { padding-top: 1.5rem !important; }
.pt-5 { padding-top: 3rem !important; }

.pb-0 { padding-bottom: 0 !important; }
.pb-1 { padding-bottom: 0.25rem !important; }
.pb-2 { padding-bottom: 0.5rem !important; }
.pb-3 { padding-bottom: 1rem !important; }
.pb-4 { padding-bottom: 1.5rem !important; }
.pb-5 { padding-bottom: 3rem !important; }

.pl-0 { padding-left: 0 !important; }
.pl-1 { padding-left: 0.25rem !important; }
.pl-2 { padding-left: 0.5rem !important; }
.pl-3 { padding-left: 1rem !important; }
.pl-4 { padding-left: 1.5rem !important; }
.pl-5 { padding-left: 3rem !important; }

.pr-0 { padding-right: 0 !important; }
.pr-1 { padding-right: 0.25rem !important; }
.pr-2 { padding-right: 0.5rem !important; }
.pr-3 { padding-right: 1rem !important; }
.pr-4 { padding-right: 1.5rem !important; }
.pr-5 { padding-right: 3rem !important; }

.w-25 { width: 25% !important; }
.w-50 { width: 50% !important; }
.w-75 { width: 75% !important; }
.w-100 { width: 100% !important; }
.w-auto { width: auto !important; }

.h-25 { height: 25% !important; }
.h-50 { height: 50% !important; }
.h-75 { height: 75% !important; }
.h-100 { height: 100% !important; }
.h-auto { height: auto !important; }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-success { background-color: var(--accent-success) !important; }
.bg-info { background-color: var(--accent-info) !important; }
.bg-warning { background-color: var(--accent-warning) !important; }
.bg-danger { background-color: var(--accent-danger) !important; }
.bg-light { background-color: var(--neutral-200) !important; }
.bg-dark { background-color: var(--neutral-800) !important; }
.bg-white { background-color: white !important; }

.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-success { color: var(--accent-success) !important; }
.text-info { color: var(--accent-info) !important; }
.text-warning { color: var(--accent-warning) !important; }
.text-danger { color: var(--accent-danger) !important; }
.text-light { color: var(--neutral-200) !important; }
.text-dark { color: var(--neutral-800) !important; }
.text-white { color: white !important; }

/* Responsiveness */
@media (max-width: 992px) {
  .navbar-nav {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
  }
  
  .navbar-right {
    margin-left: 0;
    margin-top: 1rem;
    width: 100%;
    justify-content: space-between;
  }
  
  .auth-buttons {
    margin-left: 0;
  }
  
  .lang-selector {
    margin-left: 0;
  }
}

@media (max-width: 768px) {
  .footer-section {
    flex: 0 0 100%;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .col-12 {
    flex: 0 0 100%;
    max-width: 100%;
  }
}