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

:root {
  --primary: #1A1A1A;
  --accent: #00C853;
  --accent-dark: #00a844;
  --yellow: #F5E642;
  --coral: #FF6B6B;
  --blue: #4361EE;
  --gray: #555;
  --light-gray: #f5f5f0;
  --border: #e0e0da;
  --white: #fff;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1400px;
  --nav-height: 64px;
  /* Category colors */
  --cat-raum: #FF3C64;
  --cat-mobil: #00DC82;
  --cat-ki: #823CFF;
  --cat-lehre: #00B4FF;
  --cat-interview: #FF9500;
}

html { scroll-behavior: smooth; font-size: 16px; }
.skip-to-content:focus { left: 0; outline: 3px solid var(--accent); }
body { font-family: var(--font); color: var(--primary); background: var(--white); line-height: 1.6; -webkit-font-smoothing: antialiased; }

h1, h2, h3, .hero-title, .section-title, .service-title, .featured-title, .project-title, .nav-logo {
  font-family: var(--font-heading);
}

/* === NAVIGATION === */
nav { position: fixed; top: 0; left: 0; right: 0; height: var(--nav-height); background: rgba(255,255,255,0.92); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); z-index: 1000; transition: all 0.3s ease; }
nav.scrolled { box-shadow: 0 1px 20px rgba(0,0,0,0.06); }
.nav-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 1.25rem; font-weight: 900; letter-spacing: 2px; color: var(--primary); text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
.nav-links a { text-decoration: none; color: var(--gray); font-size: 0.8rem; font-weight: 500; letter-spacing: 1.5px; text-transform: uppercase; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-social { display: flex; gap: 0.75rem; align-items: center; }
.nav-social > a { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--border); text-decoration: none; color: var(--primary); font-size: 0.75rem; font-weight: 600; transition: all 0.2s; }
.nav-social > a:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }
/* Apps Button */
.nav-apps-wrapper { position: relative; }
.nav-apps-btn { display: flex; align-items: center; gap: 0.4rem; height: 36px; padding: 0 0.9rem; border-radius: 50px; border: 1px solid var(--border); background: transparent; cursor: pointer; font-family: var(--font-heading); font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--primary); transition: all 0.2s; }
.nav-apps-btn:hover { background: var(--primary); color: var(--white); border-color: var(--primary); }
.nav-apps-btn svg { width: 14px; height: 14px; }
.nav-apps-btn:hover svg { stroke: var(--white); }
.apps-dropdown { position: absolute; top: calc(100% + 8px); right: 0; background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 0.75rem; min-width: 200px; box-shadow: 0 8px 30px rgba(0,0,0,0.12); opacity: 0; visibility: hidden; transform: translateY(-6px); transition: all 0.2s ease; z-index: 100; backdrop-filter: none; }
.apps-dropdown.open { opacity: 1; visibility: visible; transform: translateY(0); }
.apps-dropdown-label { font-size: 0.55rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--gray); margin-bottom: 0.5rem; padding-left: 0.15rem; }
.app-chip { display: flex; align-items: center; gap: 0.4rem; padding: 0.5rem 0.7rem; border-radius: 8px; background: var(--white); font-size: 0.8rem; font-weight: 500; color: var(--primary); text-decoration: none; transition: all 0.15s; font-family: var(--font); white-space: nowrap; }
.app-chip:hover { background: var(--light-gray); }
.app-chip svg { width: 14px; height: 14px; flex-shrink: 0; opacity: 0.5; }
.app-chip:hover svg { opacity: 1; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--primary); margin: 5px 0; transition: all 0.3s; }
.lang-toggle { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; margin-left: 0.5rem; }
.lang-btn { padding: 0.3rem 0.7rem; font-size: 0.7rem; font-weight: 600; border: none; background: transparent; cursor: pointer; color: var(--gray); font-family: var(--font); transition: all 0.2s; }
.lang-btn.active { background: var(--primary); color: var(--white); }

/* === HERO === */
.hero { padding-top: calc(var(--nav-height) + 3rem); padding-bottom: 4rem; display: flex; align-items: flex-start; position: relative; overflow: hidden; }
.hero-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: start; width: 100%; position: relative; z-index: 2; }
.hero-content { padding-top: 2rem; margin-left: auto; max-width: 540px; }
.hero-photo { width: 120px; height: 120px; border-radius: 50%; overflow: hidden; border: 3px solid var(--accent); margin-bottom: 1.5rem; }
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }
.hero-name { font-family: var(--font-heading); font-size: 1rem; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--primary); margin-bottom: 0.25rem; }
.hero-subtitle { font-size: 0.8rem; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--gray); margin-bottom: 0.75rem; }
.hero-desc { font-size: 1.05rem; color: var(--gray); line-height: 1.7; margin-bottom: 1rem; max-width: 480px; }
.hero-title { font-size: 3.8rem; font-weight: 700; line-height: 1.08; margin-bottom: 2rem; letter-spacing: -2px; }
.hero-buttons { display: flex; gap: 1rem; margin-bottom: 2rem; }
.btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.9rem 2rem; border-radius: 50px; font-size: 0.85rem; font-weight: 600; letter-spacing: 0.5px; text-decoration: none; cursor: pointer; transition: all 0.25s; text-transform: uppercase; font-family: var(--font-heading); }
.btn-primary { background: var(--primary); color: var(--white); border: 2px solid var(--primary); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,200,83,0.3); }
.btn-secondary { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-secondary:hover { background: var(--yellow); color: var(--primary); border-color: var(--yellow); transform: translateY(-2px); }
.hero-collab-label { font-size: 0.7rem; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--gray); margin-bottom: 0.5rem; }
.hero-collab-list { font-size: 0.9rem; color: var(--primary); font-weight: 500; }

/* === HERO IMAGE === */
.hero-image-wrapper { position: relative; width: 100%; border-radius: 16px; overflow: hidden; aspect-ratio: 4 / 3; }
.hero-image-wrapper img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-image-overlay { position: absolute; bottom: 0; left: 0; right: 0; padding: 2rem 1.5rem 1.5rem; background: linear-gradient(transparent 0%, rgba(0,0,0,0.5) 100%); }
.hero-image-name { font-family: var(--font-heading); font-size: 1.1rem; font-weight: 700; color: #fff; margin-bottom: 0.25rem; }
.hero-image-role { font-size: 0.8rem; color: rgba(255,255,255,0.8); letter-spacing: 0.5px; }

/* === SECTIONS === */
section { padding: 6rem 0; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }
.section-label { font-size: 0.7rem; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 0.75rem; }
.section-title { font-size: 2.75rem; font-weight: 700; margin-bottom: 1rem; letter-spacing: -1px; }
.section-desc { font-size: 1.05rem; color: var(--gray); max-width: 600px; line-height: 1.7; margin-bottom: 3rem; }

/* === SERVICES === */
.services { background: var(--light-gray); padding-top: 4rem; }
.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.service-card { background: var(--white); border-radius: 12px; padding: 2.5rem 2rem; border: 1px solid var(--border); transition: all 0.3s ease; }
.service-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); border-color: var(--accent); }
.service-icon { width: 32px; height: 32px; margin-bottom: 1.5rem; display: flex; align-items: center; justify-content: center; }
.service-icon svg { width: 28px; height: 28px; }
.service-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 0.75rem; }
.service-desc { font-size: 0.9rem; color: var(--gray); line-height: 1.7; margin-bottom: 1.5rem; }
.service-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag { font-size: 0.7rem; font-weight: 500; padding: 0.3rem 0.65rem; background: var(--light-gray); border-radius: 4px; color: var(--gray); transition: transform 0.15s, box-shadow 0.15s; }
.tag-accent { background: rgba(0,200,83,0.1); color: var(--accent-dark); }
.service-card .tag[data-cat] { cursor: pointer; }
.service-card .tag[data-cat]:hover { transform: translateY(-1px); box-shadow: 0 2px 8px rgba(0,0,0,0.1); }

/* === PROJECTS GRID === */
.projects-filter { display: flex; gap: 0.5rem; margin-bottom: 2.5rem; flex-wrap: wrap; }
.filter-btn { padding: 0.5rem 1.25rem; border: 1px solid var(--border); border-radius: 6px; background: var(--white); font-size: 0.8rem; font-weight: 500; color: var(--gray); cursor: pointer; transition: all 0.2s; font-family: var(--font); }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: var(--white); border-color: var(--primary); }
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.project-card { border-radius: 12px; border: 1px solid var(--border); overflow: hidden; transition: all 0.3s ease; cursor: pointer; background: var(--white); }
.project-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.project-card.hidden { display: none; }

/* === PROJECT MODAL === */
.project-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 1000; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; padding: 2rem; }
.project-modal.active { opacity: 1; pointer-events: all; }
.modal-backdrop { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-content { position: relative; background: var(--white); border-radius: 16px; max-width: 700px; width: 100%; max-height: 90vh; overflow-y: auto; box-shadow: 0 25px 80px rgba(0,0,0,0.2); transform: scale(0.95) translateY(10px); transition: transform 0.3s ease; }
.project-modal.active .modal-content { transform: scale(1) translateY(0); }
.modal-close { position: absolute; top: 12px; right: 12px; width: 36px; height: 36px; border-radius: 50%; border: none; background: rgba(255,255,255,0.9); backdrop-filter: blur(10px); font-size: 1.2rem; cursor: pointer; z-index: 10; display: flex; align-items: center; justify-content: center; transition: background 0.2s; color: #333; }
.modal-close:hover { background: rgba(255,255,255,1); }
.modal-img-wrap { position: relative; width: 100%; max-height: 480px; overflow: hidden; background: #f0f0f0; }
.modal-img-wrap img { width: 100%; height: auto; max-height: 480px; object-fit: contain; display: block; transition: opacity 0.3s ease; margin: 0 auto; }
.modal-img-prev, .modal-img-next { position: absolute; top: 50%; transform: translateY(-50%); width: 40px; height: 40px; border-radius: 50%; border: none; background: rgba(255,255,255,0.85); backdrop-filter: blur(6px); font-size: 1.4rem; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background 0.2s, opacity 0.2s; color: #333; z-index: 5; opacity: 0; }
.modal-img-wrap:hover .modal-img-prev, .modal-img-wrap:hover .modal-img-next { opacity: 1; }
.modal-img-prev { left: 10px; }
.modal-img-next { right: 10px; }
.modal-img-prev:hover, .modal-img-next:hover { background: rgba(255,255,255,1); }
.modal-img-prev.hidden, .modal-img-next.hidden { display: none; }
.modal-img-dots { position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%); display: flex; gap: 6px; z-index: 5; }
.modal-img-dots.hidden { display: none; }
.modal-dot { width: 8px; height: 8px; border-radius: 50%; background: rgba(255,255,255,0.5); border: none; cursor: pointer; padding: 0; transition: background 0.2s, transform 0.2s; }
.modal-dot.active { background: rgba(255,255,255,0.95); transform: scale(1.25); }
.modal-body { padding: 1.75rem 2rem 2rem; }
.modal-meta { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.modal-category { font-size: 0.7rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 0.25rem 0.6rem; border-radius: 4px; }
.modal-year { font-size: 0.8rem; color: var(--gray); }
.modal-title { font-size: 1.4rem; font-weight: 700; line-height: 1.3; margin-bottom: 0.75rem; }
.modal-desc { font-size: 0.95rem; color: var(--gray); line-height: 1.7; margin-bottom: 1.25rem; }
.modal-desc p { margin: 0 0 0.75rem 0; }
.modal-desc p:last-child { margin-bottom: 0; }
.modal-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.25rem; }
.modal-links:empty { display: none; }
.modal-link { display: inline-flex; align-items: center; gap: 0.3rem; font-size: 0.8rem; font-weight: 500; color: var(--accent); text-decoration: none; padding: 0.3rem 0.7rem; border-radius: 6px; background: rgba(130,60,255,0.08); transition: background 0.2s; }
.modal-link:hover { background: rgba(130,60,255,0.15); }
.modal-youtube { position: relative; width: 100%; padding-bottom: 56.25%; margin-bottom: 1.25rem; border-radius: 10px; overflow: hidden; background: #000; }
.modal-youtube:empty { display: none; }
.modal-youtube iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
@media (max-width: 600px) {
  .project-modal { padding: 1rem; }
  .modal-content { max-height: 95vh; border-radius: 12px; }
  .modal-body { padding: 1.25rem 1.5rem 1.5rem; }
  .modal-title { font-size: 1.2rem; }
}

.project-img { height: 180px; overflow: hidden; }
.project-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.project-card:hover .project-img img { transform: scale(1.05); }
.project-info { padding: 1.25rem 1.5rem; }
.project-meta { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.project-category { font-size: 0.65rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent); }
.project-year { font-size: 0.75rem; color: var(--gray); }
.project-title { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; line-height: 1.3; }
.project-desc-text { font-size: 0.82rem; color: var(--gray); line-height: 1.6; margin-bottom: 1rem; }

/* === TEACHING === */
.teaching { background: var(--light-gray); }
.teaching-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.teaching-positions h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.5rem; }
.position-item { padding: 1.25rem 0; border-bottom: 1px solid var(--border); }
.position-item:last-child { border-bottom: none; }
.position-org { font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent); margin-bottom: 0.25rem; }
.position-role { font-size: 1rem; font-weight: 600; margin-bottom: 0.25rem; }
.position-period { font-size: 0.82rem; color: var(--gray); }
.position-details { font-size: 0.85rem; color: var(--gray); margin-top: 0.5rem; line-height: 1.6; }
.workshop-item { background: var(--white); border-radius: 10px; border: 1px solid var(--border); padding: 1.25rem 1.5rem; margin-bottom: 1rem; transition: all 0.2s; }
.workshop-item:hover { border-color: var(--accent); }
.workshop-year { font-size: 0.7rem; font-weight: 600; color: var(--accent); letter-spacing: 1px; }
.workshop-title { font-size: 0.95rem; font-weight: 600; margin: 0.25rem 0; }
.workshop-venue { font-size: 0.82rem; color: var(--gray); }

/* === ABOUT === */
.about-portrait { text-align: left; margin-bottom: 2.5rem; }
.about-portrait .hero-photo { margin: 0 0 1rem; }
.about-portrait .hero-name { margin-bottom: 0.25rem; }
.about-portrait .hero-subtitle { margin-bottom: 0; }
.about-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 4rem; align-items: start; }
.about-text p { font-size: 1rem; color: var(--gray); line-height: 1.8; margin-bottom: 1.25rem; }
.about-sidebar h3 { font-size: 0.9rem; font-weight: 700; margin-bottom: 1rem; margin-top: 2rem; }
.about-sidebar h3:first-child { margin-top: 0; }
.education-item, .membership-item { padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.education-item:last-child, .membership-item:last-child { border-bottom: none; }
.education-degree { font-size: 0.9rem; font-weight: 600; }
.education-school { font-size: 0.82rem; color: var(--gray); }
.membership-item { font-size: 0.85rem; color: var(--gray); }

/* === CONTACT === */
.contact { background: var(--yellow); color: var(--primary); padding: 6rem 0 4rem; min-height: calc(100vh - 80px); display: flex; align-items: center; }
.contact .container { max-width: var(--max-width); }
.contact .section-label { color: var(--primary); opacity: 0.5; }
.contact .section-title { color: var(--primary); font-size: 4rem; letter-spacing: -2px; line-height: 1.0; }
.contact .section-desc { color: rgba(26,26,26,0.6); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 6rem; }
.contact-info-item { margin-bottom: 1.5rem; }
.contact-info-label { font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--primary); opacity: 0.5; margin-bottom: 0.35rem; }
.contact-info-value { font-size: 1rem; color: var(--primary); }
.contact-info-value a { color: var(--primary); text-decoration: none; border-bottom: 2px solid rgba(26,26,26,0.2); transition: all 0.2s; }
.contact-info-value a:hover { border-color: var(--primary); }
.contact-cta { display: flex; flex-direction: column; justify-content: center; height: 100%; }
.contact-cta-text { font-size: 1.05rem; color: rgba(26,26,26,0.6); margin-bottom: 2rem; line-height: 1.6; }
.contact-cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.contact-btn { display: flex; align-items: center; justify-content: center; gap: 0.6rem; padding: 0.9rem 1.25rem; border-radius: 10px; font-family: var(--font-heading); font-size: 0.95rem; font-weight: 600; text-decoration: none; transition: all 0.2s ease; }
.contact-btn-whatsapp { background: #25D366; color: var(--white); }
.contact-btn-whatsapp:hover { background: #1eba57; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,211,102,0.3); }
.contact-btn-email { background: var(--primary); color: var(--yellow); }
.contact-btn-email:hover { background: #333; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,26,26,0.2); }
.contact-btn-outline { background: transparent; color: var(--primary); border: 2px solid rgba(26,26,26,0.25); }
.contact-btn-outline:hover { border-color: var(--primary); transform: translateY(-2px); }
.contact-events { margin-top: 2rem; }
.contact-events-label { font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: var(--primary); opacity: 0.5; margin-bottom: 0.75rem; }
.event-card { display: flex; align-items: center; gap: 1rem; padding: 0.85rem 0; border-bottom: 1px solid rgba(26,26,26,0.1); color: var(--primary); transition: all 0.2s; }
.event-card:first-child { border-top: 1px solid rgba(26,26,26,0.1); }
.event-card-link { display: flex; align-items: center; gap: 1rem; text-decoration: none; color: var(--primary); flex: 1; min-width: 0; transition: all 0.2s; }
.event-card-link:hover { padding-left: 0.5rem; }
.event-register-btn { flex-shrink: 0; padding: 0.4rem 0.85rem; font-family: var(--font-heading); font-size: 0.75rem; font-weight: 600; border-radius: 6px; background: var(--primary); color: var(--yellow); text-decoration: none; transition: all 0.2s; white-space: nowrap; }
.event-register-btn:hover { background: #333; transform: translateY(-1px); }
.event-date-badge { min-width: 44px; height: 44px; background: var(--primary); color: var(--yellow); border-radius: 8px; display: flex; flex-direction: column; align-items: center; justify-content: center; line-height: 1; }
.event-day { font-family: var(--font-heading); font-size: 1.15rem; font-weight: 700; }
.event-month { font-size: 0.6rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.event-info { display: flex; flex-direction: column; gap: 0.15rem; }
.event-time { font-size: 0.7rem; color: rgba(26,26,26,0.45); font-weight: 500; }
.event-title { font-family: var(--font-heading); font-size: 0.9rem; font-weight: 600; }
.event-location { font-size: 0.75rem; color: rgba(26,26,26,0.5); }
.events-more { display: inline-block; margin-top: 0.75rem; font-family: var(--font-heading); font-size: 0.8rem; font-weight: 600; color: var(--primary); text-decoration: none; opacity: 0.5; transition: opacity 0.2s; }
.events-more:hover { opacity: 1; }
.btn-accent { background: var(--primary); color: var(--yellow); border: 2px solid var(--primary); width: 100%; justify-content: center; font-family: var(--font-heading); font-weight: 600; }
.btn-accent:hover { background: #333; border-color: #333; }

/* === FOOTER === */
footer { background: var(--primary); border-top: none; padding: 2rem 0; }
.footer-inner { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; display: flex; justify-content: space-between; align-items: center; }
.footer-text { font-size: 0.8rem; color: rgba(255,255,255,0.4); font-family: var(--font-heading); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.8rem; color: rgba(255,255,255,0.4); text-decoration: none; transition: color 0.2s; font-family: var(--font-heading); }
.footer-links a:hover { color: var(--yellow); }

/* === ANIMATIONS === */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.page-header .fade-in, .hero .fade-in, main > section:first-child .fade-in { opacity: 1; transform: none; }

/* === RESPONSIVE === */
@media (max-width: 968px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image-wrapper { max-height: 50vh; margin-top: 1rem; }
  .hero-title { font-size: 2.75rem; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .teaching-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .contact .section-title { font-size: 2.75rem; }
  .contact { padding: 5rem 0 3rem; align-items: flex-start; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-social .nav-apps-btn { font-size: 0; gap: 0; padding: 0 0.6rem; width: 36px; height: 36px; justify-content: center; }
  .nav-social .nav-apps-btn svg { width: 16px; height: 16px; }
  .nav-social a[title="LinkedIn"], .nav-social a[title="ETH RAUM"], .nav-social .lang-toggle { display: none; }
  .nav-toggle { display: block; }
  nav.menu-open .nav-links { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--white); padding: 1rem 2rem 2rem; border-bottom: 1px solid var(--border); box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
  .hero-title { font-size: 2.25rem; }
  .hero-buttons { flex-direction: column; }
  .contact-cta-grid { grid-template-columns: 1fr 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 1.75rem; }
  .hero-image-wrapper { max-height: 40vh; }
  .contact .section-title { font-size: 2.25rem; letter-spacing: -1px; }
  .contact { padding: 4rem 0 2.5rem; min-height: auto; }
  .contact-grid { gap: 2rem; }
  .contact-cta-text { font-size: 0.95rem; margin-bottom: 1.25rem; }
  .contact-btn { padding: 0.8rem 1rem; font-size: 0.85rem; }
  .event-card { flex-wrap: wrap; gap: 0.75rem; }
  .event-card-link { flex: 1 1 100%; }
  .event-register-btn { margin-left: 3.5rem; }
  .contact-info-item { margin-bottom: 1.25rem; }
}

/* === PAGE-SPECIFIC === */
.page-header { padding-top: calc(var(--nav-height) + 4rem); padding-bottom: 3rem; }
.page-header .container { max-width: var(--max-width); margin: 0 auto; padding: 0 2rem; }
.page-header .section-label { margin-bottom: 0.75rem; }
.page-header .section-title { margin-bottom: 1rem; }

/* === CONTENT SECTIONS FOR SUBPAGES === */
.content-section { padding: 4rem 0; }
.content-section:nth-child(even) { background: var(--light-gray); }

.content-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 4rem; align-items: start; }
.content-grid.reverse { grid-template-columns: 1fr 2fr; }

.content-text { font-size: 1rem; color: var(--gray); line-height: 1.8; }
.content-text p { margin-bottom: 1.25rem; }
.content-text h3 { font-family: var(--font-heading); font-size: 1.2rem; font-weight: 700; color: var(--primary); margin: 2rem 0 0.75rem; }
.content-text ul { list-style: none; padding: 0; }
.content-text ul li { padding: 0.5rem 0; padding-left: 1.5rem; position: relative; font-size: 0.95rem; color: var(--gray); }
.content-text ul li::before { content: "\2192"; position: absolute; left: 0; color: var(--accent); font-weight: 600; }

/* CTA Banner */
.cta-banner { background: var(--primary); color: var(--white); padding: 4rem 0; text-align: center; }
.cta-banner .section-title { color: var(--white); font-size: 2.5rem; margin-bottom: 0.75rem; }
.cta-banner .section-desc { color: rgba(255,255,255,0.6); margin: 0 auto 2rem; }
.cta-banner .btn-primary:hover { background: var(--accent); border-color: var(--accent); }

/* Featured Projects (homepage teaser) */
.featured-projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 2rem; }

/* Active nav link per page */
.nav-links a[data-page].active { color: var(--primary); border-bottom: 2px solid var(--accent); padding-bottom: 2px; }

@media (max-width: 968px) {
  .content-grid, .content-grid.reverse { grid-template-columns: 1fr; gap: 2rem; }
  .featured-projects { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .featured-projects { grid-template-columns: 1fr; }
  .cta-banner .section-title { font-size: 1.75rem; }
}

/* === BLOG === */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.blog-card { border-radius: 12px; border: 1px solid var(--border); overflow: hidden; transition: all 0.3s ease; background: var(--white); text-decoration: none; color: inherit; display: block; }
.blog-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.08); }
.blog-card-img { height: 200px; overflow: hidden; background: var(--light-gray); }
.blog-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.blog-card:hover .blog-card-img img { transform: scale(1.05); }
.blog-card-body { padding: 1.5rem; }
.blog-card-meta { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.75rem; flex-wrap: nowrap; overflow: hidden; }
.blog-card-category { font-size: 0.6rem; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; padding: 0.2rem 0.5rem; border-radius: 4px; white-space: nowrap; }
.blog-card-date { font-size: 0.72rem; color: var(--gray); white-space: nowrap; }
.blog-card-reading { font-size: 0.72rem; color: var(--gray); white-space: nowrap; }
.blog-card-reading::before { content: "\2022"; margin-right: 0.35rem; }
.blog-card-title { font-family: var(--font-heading); font-size: 1.1rem; font-weight: 700; line-height: 1.3; margin-bottom: 0.5rem; color: var(--primary); }
.blog-card-excerpt { font-size: 0.85rem; color: var(--gray); line-height: 1.6; }

/* Blog Article */
.article-header { padding-top: calc(var(--nav-height) + 4rem); padding-bottom: 2rem; }
.article-header .container { max-width: 800px; }
.article-meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.article-category { font-size: 0.7rem; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; padding: 0.25rem 0.6rem; border-radius: 4px; }
.article-date { font-size: 0.85rem; color: var(--gray); }
.article-reading { font-size: 0.85rem; color: var(--gray); }
.article-title { font-size: 2.5rem; font-weight: 700; line-height: 1.15; letter-spacing: -1px; margin-bottom: 1rem; }
.article-lead { font-size: 1.15rem; color: var(--gray); line-height: 1.7; max-width: 700px; }
.article-hero-img { width: 100%; max-height: 480px; object-fit: cover; border-radius: 12px; margin: 2rem 0; }
.article-body { max-width: 800px; margin: 0 auto; padding: 0 2rem; }
.article-body .content-text h2 { font-size: 1.5rem; margin: 2.5rem 0 1rem; color: var(--primary); }
.article-body .content-text h3 { margin: 2rem 0 0.75rem; }
.article-body .content-text blockquote { border-left: 3px solid var(--accent); padding: 1rem 1.5rem; margin: 1.5rem 0; background: var(--light-gray); border-radius: 0 8px 8px 0; font-style: italic; }
.article-body .content-text blockquote p { margin-bottom: 0; }
.article-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 3rem 0 2rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.article-tags .tag { font-size: 0.75rem; }

/* Related articles */
.related-articles { background: var(--light-gray); padding: 4rem 0; }
.related-articles .blog-grid { margin-top: 2rem; }

/* Blog teaser on homepage */
.blog-teaser .blog-grid { margin-top: 2rem; }

@media (max-width: 968px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-card-meta { gap: 0.35rem; }
  .blog-card-category { font-size: 0.55rem; padding: 0.15rem 0.4rem; }
  .blog-card-date, .blog-card-reading { font-size: 0.65rem; }
  .article-title { font-size: 2rem; }
}
@media (max-width: 640px) {
  .blog-grid { grid-template-columns: 1fr; }
  .article-title { font-size: 1.5rem; }
  .article-header .container { padding: 0 1.5rem; }
  .article-body { padding: 0 1.5rem; }
}