/* ======================
   CSS-VARIABLEN FÜR EINHEITLICHES DESIGN
   ====================== */
:root {
  /* Farbschema */
  --primary-color: #3498db; /* Blau */
  --secondary-color: #2c3e50; /* Dunkelblau */
  --accent-color: #e74c3c; /* Rot/Orange */
  --light-color: #f8f9fa; /* Hellgrau */
  --dark-color: #343a40; /* Dunkelgrau */
  --text-color: #212529; /* Fast-Schwarz für Text */
  --text-secondary: #6c757d; /* Grau für Sekundärtext */
  --border-color: #dee2e6; /* Hellgrau für Rahmen */

  /* Typografie */
  --font-primary: "Roboto", "Helvetica Neue", sans-serif;
  --font-heading: "Montserrat", "Helvetica Neue", sans-serif;

  /* Abstände */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Rahmen */
  --border-radius: 0.25rem;
  --border-radius-lg: 0.5rem;

  /* Schatten */
  --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);

  /* Übergänge */
  --transition: all 0.3s ease;
}

/* Dark Mode Variablen */
:root[data-theme="dark"] {
  --primary-color: #4dabf7;
  --secondary-color: #495057;
  --accent-color: #ff6b6b;
  --light-color: #1a1a1a;
  --dark-color: #f8f9fa;
  --text-color: #f8f9fa;
  --text-secondary: #adb5bd;
  --border-color: #495057;
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-card: #2d2d2d;
}

/* ======================
   GRUND-STYLES
   ====================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--text-color);
  padding-top: 80px;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ======================
   HEADER & NAVIGATION
   ====================== */
header {
  background: white;
  padding: var(--spacing-md) 0;
  box-shadow: var(--box-shadow);
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
}

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

.logo a {
  font-size: 24px;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
}

/* Navigation Controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  list-style: none;
}

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

.nav-menu a {
  text-decoration: none;
  color: var(--text-color);
  transition: var(--transition);
}

.nav-menu a.active {
  font-weight: bold;
  color: var(--primary-color);
}

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

/* Theme Toggle Styles */
.theme-toggle {
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  background: transparent;
  border: 2px solid var(--border-color);
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background-color: var(--light-color);
  border-color: var(--primary-color);
}

.theme-icon {
  font-size: 18px;
  transition: var(--transition);
}

.theme-toggle.rotating .theme-icon {
  transform: rotate(180deg);
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: none;
  border: none;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--text-color);
  border-radius: 3px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* DESKTOP: Theme Toggle neben Logo */
@media screen and (min-width: 769px) {
  .theme-toggle {
    position: absolute;
    left: 80px;
    top: 50%;
    transform: translateY(-50%);
  }

  .nav-toggle {
    display: none;
  }

  .nav-menu {
    display: flex;
  }
}

/* MOBILE: Theme Toggle links vom Nav-Toggle */
@media screen and (max-width: 768px) {
  .nav-controls {
    gap: var(--spacing-sm);
  }

  .theme-toggle {
    order: 1;
    position: static;
    transform: none;
  }

  .nav-toggle {
    order: 2;
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: white;
    flex-direction: column;
    align-items: center;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    z-index: 100;
    box-shadow: var(--box-shadow);
  }

  .nav-menu.active {
    max-height: 300px;
    padding: var(--spacing-md) 0;
  }

  .nav-menu li {
    margin: var(--spacing-xs) 0;
    width: 100%;
    text-align: center;
  }
}

/* ======================
   HERO SECTION
   ====================== */
.hero {
  background-color: var(--light-color);
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.hero h1 {
  font-size: 36px;
  font-family: var(--font-heading);
  margin-bottom: var(--spacing-sm);
}

.hero h2 {
  font-size: 24px;
  font-weight: normal;
  margin-bottom: var(--spacing-md);
}

/* ======================
   ABOUT SECTION
   ====================== */
.about {
  padding: var(--spacing-xl) 0;
}

.about h2 {
  font-family: var(--font-heading);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  font-size: 2.5rem;
  color: var(--secondary-color);
}

/* About Content Styling */
.about-content {
  max-width: 1000px;
  margin: 0 auto;
}

.about-intro {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  text-align: center;
  color: var(--text-secondary);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--spacing-xl);
}

/* ======================
   FOOTER
   ====================== */
footer {
  background-color: var(--dark-color);
  color: white;
  text-align: center;
  padding: var(--spacing-md) 0;
  margin-top: var(--spacing-xl);
}

/* ======================
   DARK MODE STYLES
   ====================== */
[data-theme="dark"] body {
  background-color: var(--bg-primary);
  color: var(--text-color);
  padding-top: 80px;
}

[data-theme="dark"] header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
}

[data-theme="dark"] .hero {
  background-color: var(--bg-secondary);
}

[data-theme="dark"] footer {
  background-color: var(--bg-card);
}

[data-theme="dark"] .theme-toggle:hover {
  background-color: var(--bg-card);
}

[data-theme="dark"] .nav-menu {
  background-color: var(--bg-secondary);
}

[data-theme="dark"] .nav-menu a {
  color: var(--text-color);
}

[data-theme="dark"] .nav-menu a:hover {
  color: var(--accent-color);
}

[data-theme="dark"] .nav-menu a.active {
  color: var(--primary-color);
}

[data-theme="dark"] .nav-toggle span {
  background-color: var(--text-color);
}

/* ======================
   ABOUT ME SEITE - PORTRAIT & GALERIE
   ====================== */

/* Portrait Bild im Hero Bereich */
.portrait {
  margin: var(--spacing-lg) 0;
  display: flex;
  justify-content: center;
}

.portrait-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--primary-color);
  box-shadow: var(--box-shadow-lg);
  transition: var(--transition);
}

.portrait-img:hover {
  transform: scale(1.05);
  box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.2);
}

/* Interests Section */
.interests-section {
  margin-top: var(--spacing-xl);
}

.interests-section h3 {
  font-family: var(--font-heading);
  font-size: 2rem;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--primary-color);
}

.interests-intro {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Section Titles für Untergruppen */
.section-title {
  margin: var(--spacing-xl) 0 var(--spacing-lg) 0;
  text-align: center;
}

.section-title h4 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--secondary-color);
  position: relative;
  display: inline-block;
  padding-bottom: var(--spacing-sm);
}

.section-title h4::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  border-radius: 2px;
}

/* Photo Gallery */
.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.gallery-item {
  background: white;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}

.gallery-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--box-shadow-lg);
}

.gallery-img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover .gallery-img {
  transform: scale(1.1);
}

.gallery-caption {
  padding: var(--spacing-md);
  position: relative;
}

.gallery-caption h4 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-color);
}

.gallery-caption p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Spezielle Styles für Reise-Galerie */
.travel-gallery .gallery-item {
  position: relative;
  overflow: hidden;
}

.travel-gallery .gallery-item::before {
  content: "✈️";
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 1.2rem;
  z-index: 2;
  opacity: 0.8;
}

/* Spezielle Styles für Interessen-Galerie */
.interests-gallery .gallery-item::before {
  content: "⭐";
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 1.2rem;
  z-index: 2;
  opacity: 0.8;
}

/* Dark Mode für Portrait & Galerie */
[data-theme="dark"] .portrait-img {
  border-color: var(--primary-color);
}

[data-theme="dark"] .gallery-item {
  background-color: var(--bg-card);
}

[data-theme="dark"] .gallery-caption h4 {
  color: var(--text-color);
}

[data-theme="dark"] .gallery-caption p {
  color: var(--text-secondary);
}

[data-theme="dark"] .about-intro,
[data-theme="dark"] .interests-intro {
  color: var(--text-secondary);
}

[data-theme="dark"] .interests-section h3 {
  color: var(--primary-color);
}

[data-theme="dark"] .section-title h4 {
  color: var(--text-color);
}

/* ======================
   EDUCATION SEITE - TIMELINE
   ====================== */

/* Education Section */
.education {
  padding: var(--spacing-xl) 0;
}

.education h2 {
  font-family: var(--font-heading);
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: 2.5rem;
  color: var(--secondary-color);
}

/* Timeline Container */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-lg) 0;
}

/* Timeline Linie */
.timeline::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(
    to bottom,
    var(--primary-color),
    var(--accent-color)
  );
  border-radius: 2px;
}

/* Timeline Item */
.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
  padding-left: 80px;
}

/* Timeline Marker */
.timeline-marker {
  position: absolute;
  left: 18px;
  top: 0;
}

.timeline-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 4px solid white;
  box-shadow: 0 0 0 4px var(--primary-color);
  transition: var(--transition);
}

/* Aktueller Punkt hervorheben */
.timeline-item.current .timeline-dot {
  background: var(--accent-color);
  box-shadow: 0 0 0 4px var(--accent-color);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 4px var(--accent-color);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(231, 76, 60, 0.3);
  }
  100% {
    box-shadow: 0 0 0 4px var(--accent-color);
  }
}

/* Timeline Content */
.timeline-content {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  position: relative;
}

.timeline-content::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 20px;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-right: 10px solid white;
}

.timeline-content:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-lg);
}

/* Timeline Header */
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.timeline-header h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 0;
}

.timeline-date {
  background: var(--primary-color);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
}

/* Institution & Study Type */
.timeline-content h4 {
  font-size: 1.3rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
}

.institution {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-style: italic;
}

.study-type {
  display: inline-block;
  background: var(--light-color);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  color: var(--text-color);
  margin-bottom: var(--spacing-md);
}

.description {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Curriculum Section */
.curriculum {
  margin-top: var(--spacing-md);
}

.curriculum h5 {
  font-size: 1.1rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
}

/* Subjects Grid */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.subject {
  background: var(--light-color);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  text-align: center;
  border-left: 3px solid var(--primary-color);
  transition: var(--transition);
}

.subject:hover {
  background: var(--primary-color);
  color: white;
  transform: translateX(5px);
}

/* Achievements */
.achievements {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.achievement {
  background: var(--light-color);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--primary-color);
  transition: var(--transition);
  text-align: center;
}

.achievement:hover {
  background: var(--primary-color);
  color: white;
  transform: translateX(5px);
}

.achievement h5 {
  color: var(--text-color);
  margin-bottom: 0;
  font-size: 0.9rem;
  font-weight: 500;
}

.achievement:hover h5 {
  color: white;
}

.achievement p {
  color: var(--text-secondary);
  margin: 0;
  font-size: 0.9rem;
  font-style: normal;
}

.achievement:hover p {
  color: rgba(255, 255, 255, 0.9);
}

/* Dark Mode für Education Timeline */
[data-theme="dark"] .timeline-content {
  background-color: var(--bg-card);
}

[data-theme="dark"] .timeline-content::before {
  border-right-color: var(--bg-card);
}

[data-theme="dark"] .timeline-header h3 {
  color: var(--primary-color);
}

[data-theme="dark"] .timeline-content h4 {
  color: var(--text-color);
}

[data-theme="dark"] .institution {
  color: var(--text-secondary);
}

[data-theme="dark"] .study-type {
  background: var(--bg-secondary);
  color: var(--text-color);
}

[data-theme="dark"] .subject {
  background: var(--bg-secondary);
  color: var(--text-color);
}

[data-theme="dark"] .achievement {
  background: var(--bg-secondary);
  color: var(--text-color);
}

[data-theme="dark"] .achievement h5 {
  color: var(--text-color);
}

[data-theme="dark"] .achievement p {
  color: var(--text-secondary);
  font-style: normal;
}

[data-theme="dark"] .achievement:hover {
  background: var(--primary-color);
  color: white;
}

[data-theme="dark"] .achievement:hover h5,
[data-theme="dark"] .achievement:hover p {
  color: white;
}

[data-theme="dark"] .curriculum h5 {
  color: var(--text-color);
}

[data-theme="dark"] .education h2 {
  color: var(--text-color);
}

/* ======================
   CONTACT SEITE - FORMULAR
   ====================== */

/* Contact Section */
.contact {
  padding: var(--spacing-xl) 0;
}

.contact-wrapper {
  max-width: 1000px;
  margin: 0 auto;
}

.contact-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.contact-header h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
}

.contact-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Contact Form Container - Single Column Layout */
.contact-form-container.single-column {
  display: block;
  max-width: 700px;
  margin: 0 auto;
}

/* Contact Form */
.contact-form {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--box-shadow-lg);
  border: 1px solid var(--border-color);
}

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

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: var(--font-primary);
  transition: var(--transition);
  background: white;
  color: var(--text-color);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.5;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.8;
}

/* Form Actions */
.form-actions {
  text-align: center;
  margin-top: var(--spacing-lg);
}

.submit-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-primary);
}

.submit-btn:hover {
  background: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow-lg);
}

.submit-btn:active {
  transform: translateY(-1px);
}

.btn-icon {
  font-size: 1.2rem;
}

.btn-text {
  font-size: 1rem;
}

/* Form Validation Styles */
.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-group input:valid:not(:placeholder-shown),
.form-group textarea:valid:not(:placeholder-shown) {
  border-color: #28a745;
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.1);
}

/* Loading State für Button */
.submit-btn.loading {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.submit-btn.loading .btn-text::after {
  content: "...";
  animation: dots 1.5s infinite;
}

@keyframes dots {
  0%,
  20% {
    content: "";
  }
  40% {
    content: ".";
  }
  60% {
    content: "..";
  }
  80%,
  100% {
    content: "...";
  }
}

/* Dark Mode für Contact Form */
[data-theme="dark"] .contact-header h2 {
  color: var(--text-color);
}

[data-theme="dark"] .contact-header p {
  color: var(--text-secondary);
}

[data-theme="dark"] .contact-form {
  background: var(--bg-card);
  border-color: var(--border-color);
}

[data-theme="dark"] .form-group label {
  color: var(--text-color);
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  color: var(--text-color);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
  border-color: var(--primary-color);
}

[data-theme="dark"] .form-group input::placeholder,
[data-theme="dark"] .form-group textarea::placeholder {
  color: var(--text-secondary);
}

[data-theme="dark"] .form-group input:valid:not(:placeholder-shown),
[data-theme="dark"] .form-group textarea:valid:not(:placeholder-shown) {
  border-color: #28a745;
}

[data-theme="dark"] .form-group input:invalid:not(:placeholder-shown),
[data-theme="dark"] .form-group textarea:invalid:not(:placeholder-shown) {
  border-color: var(--accent-color);
}