/* ====== GOOGLE FONTS ====== */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

/* ====== VARIABLES ====== */
:root {
  /* Light Theme Colors */
  --bg-body: #f5f7fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #eef1f7;
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(0, 0, 0, 0.08);

  --text-primary: #111827;
  --text-secondary: #6b7280;

  --accent-blue: #2563eb;
  --accent-purple: #7c3aed;
  --accent-green: #059669;
  --accent-gradient: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));

  /* Layout */
  --container-max: 1200px;
  --spacing-base: 1.5rem;

  /* Radii */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  --shadow-card: 0 1px 3px rgba(0,0,0,0.07), 0 8px 24px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 4px 12px rgba(0,0,0,0.08), 0 16px 40px rgba(37,99,235,0.1);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.1);
}

/* ====== RESET & BASE ====== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
  list-style: none;
}

/* ====== TYPOGRAPHY ====== */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5em;
  color: var(--text-primary);
}

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

.title-xl { font-size: clamp(2.5rem, 7vw, 4.5rem); }
.title-lg { font-size: clamp(1.8rem, 4vw, 2.75rem); }
.title-md { font-size: 1.375rem; }
.text-lg { font-size: 1.125rem; color: var(--text-secondary); }

/* ====== LAYOUT & COMPONENTS ====== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-base);
}

.section {
  padding: 6rem 0;
}

/* ====== HEADER ====== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: box-shadow var(--transition-fast);
}

.header:hover {
  box-shadow: 0 2px 20px rgba(0,0,0,0.07);
}

.header__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.875rem var(--spacing-base);
  max-width: var(--container-max);
  margin: 0 auto;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
}

.header__logo img {
  width: 38px;
  height: 38px;
}

.header__nav {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.header__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.header__link:hover {
  color: var(--accent-blue);
  background: rgba(37, 99, 235, 0.07);
}

.header__link--cta {
  background: var(--accent-gradient);
  color: #fff !important;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-sm);
}

.header__link--cta:hover {
  background: linear-gradient(135deg, #1d4ed8, #6d28d9);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

@media (max-width: 768px) {
  .header__nav { gap: 0.25rem; }
  .header__link:not(.header__link--cta) { display: none; }
}

/* ====== HERO ====== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 5rem;
  position: relative;
  overflow: hidden;
  background: var(--bg-body);
}



.hero__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: 860px;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.18);
  color: var(--accent-blue);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.375rem 1rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.hero__badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-blue);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

/* ====== SKILL CARDS (Hero) ====== */
.hero__skills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  width: 100%;
  max-width: 680px;
  margin-top: 2rem;
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
}

@media (max-width: 480px) {
  .hero__skills { grid-template-columns: 1fr 1fr; gap: 0.875rem; }
}

.skill-card {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  box-shadow: var(--shadow-card);
}

.skill-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(37, 99, 235, 0.18);
}

.skill-icon-img {
  width: 56px;
  height: 56px;
  object-fit: contain;
}

.skill-card .title-md {
  font-size: 1.125rem;
  color: var(--text-primary);
}

/* ====== HIGHLIGHT SECTION ====== */
.highlight-section {
  background: #eef1f7;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
}

.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
}

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

.highlight__image {
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(37,99,235,0.12);
  overflow: hidden;
}

.highlight__image img {
  transform: scale(1.02);
  transition: transform var(--transition-slow);
}
.highlight__image:hover img {
  transform: scale(1.06);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.25);
}

.btn--primary:hover {
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.4);
  transform: translateY(-2px);
}

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

.btn--secondary:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

/* ====== FEATURES GRID ====== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
  margin-top: 4rem;
}

.feature-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.feature-icon-wrapper {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(124,58,237,0.08));
  border: 1px solid rgba(37,99,235,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon-wrapper img {
  width: 24px;
  height: 24px;
}

.feature-content h3 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
  color: var(--text-primary);
}

.feature-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ====== IFRAMES ====== */
.iframe-container {
  width: 100%;
  margin: 3rem 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-card);
}

.iframe-footer {
  text-align: right;
  padding: 0.875rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--glass-border);
}

.iframe-footer a {
  color: var(--accent-blue);
}

.iframe-footer a:hover {
  text-decoration: underline;
}

/* Pruefungschecker page hero */
.pc-hero {
  background: linear-gradient(160deg, #f0f4ff 0%, #f5f7fa 60%, #faf0ff 100%);
  padding: 8rem 0 4rem;
  text-align: center;
}

.pc-hero p {
  max-width: 600px;
  margin: 0 auto 2rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-blue);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.4rem 0;
  transition: gap var(--transition-fast);
}

.back-link:hover { gap: 0.75rem; }
.back-link svg { transition: transform var(--transition-fast); }
.back-link:hover svg { transform: translateX(-3px); }

/* ====== PROJECTS GRID ====== */
.projects-section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.project-card {
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(37, 99, 235, 0.15);
}

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

.project-date {
  font-size: 0.8rem;
  color: var(--accent-purple);
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.project-card h3 {
  font-size: 1.375rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex-grow: 1;
  font-size: 0.95rem;
}

.project-details {
  background: var(--bg-surface-elevated);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  border: 1px solid var(--glass-border);
}

.project-details li {
  margin-bottom: 0.4rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.project-details li:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.project-details strong {
  color: var(--accent-blue);
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ====== BOOKS ====== */
.books-section {
  background: #eef1f7;
  border-top: 1px solid var(--glass-border);
}

.books-visuals {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.book-cover {
  width: 200px;
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.book-cover:hover {
  transform: translateY(-10px) rotate(2deg);
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* ====== ABOUT ====== */
.about-section {
  position: relative;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.12);
  border: 1px solid var(--glass-border);
  aspect-ratio: 1;
  max-width: 400px;
  margin: 0 auto;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ====== LEGAL ====== */
.legal-content {
  max-width: 820px;
  margin: 8rem auto 4rem auto;
  padding: 2.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.legal-content h1 {
  font-size: 2.25rem;
  margin-bottom: 2rem;
  color: var(--accent-blue);
}

.legal-content h2 {
  font-size: 1.375rem;
  margin-top: 2rem;
  margin-bottom: 0.875rem;
  padding-top: 1rem;
  border-top: 1px solid var(--glass-border);
  color: var(--text-primary);
}

.legal-content h3 {
  font-size: 1.1rem;
  margin-top: 1.25rem;
  color: var(--text-secondary);
}

.legal-content p, .legal-content li {
  margin-bottom: 0.875rem;
  color: var(--text-secondary);
}

.legal-content a {
  color: var(--accent-blue);
}

.legal-content ul {
  list-style: disc;
  padding-left: 2rem;
  margin-bottom: 1rem;
}

/* ====== FOOTER ====== */
.footer {
  text-align: center;
  padding: 3rem 0;
  border-top: 1px solid var(--glass-border);
  color: var(--text-secondary);
  background: var(--bg-surface);
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

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

/* UTILS */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mt-8 { margin-top: 2rem; }