/* =============================================
   Stiftung der Naturwissenschaften Andreas Fischer
   Design System — Based on SENSYS GmbH Branding
   ============================================= */

/* ---- @font-face (lokal gehostet) ---- */
@font-face { font-family:'Roboto'; font-style:normal; font-weight:300; font-display:swap; src:url('../fonts/roboto-light.woff2') format('woff2'); }
@font-face { font-family:'Roboto'; font-style:normal; font-weight:400; font-display:swap; src:url('../fonts/roboto-regular.woff2') format('woff2'); }
@font-face { font-family:'Roboto'; font-style:normal; font-weight:500; font-display:swap; src:url('../fonts/roboto-medium.woff2') format('woff2'); }
@font-face { font-family:'Roboto'; font-style:normal; font-weight:700; font-display:swap; src:url('../fonts/roboto-bold.woff2') format('woff2'); }

/* ---- Design Tokens ---- */
:root {
  --color-primary: #0069AE;
  --color-primary-dark: #00507F;
  --color-primary-darker: #003A5C;
  --color-primary-light: #E8F2F9;
  --color-primary-rgb: 0,105,174;
  --color-accent: #475BB2;
  --color-accent-warm: #D4A843;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F7FA;
  --color-bg-dark: #0B1F38;
  --color-text: #555555;
  --color-text-dark: #333333;
  --color-text-light: #999999;
  --color-text-white: #FFFFFF;
  --color-border: #E0E5EC;
  --font-family: 'Roboto',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --line-height: 1.7;
  --max-width: 1200px;
  --border-radius: 4px;
  --border-radius-lg: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --transition: 250ms ease;
  --transition-slow: 500ms ease;
}

/* ---- Reset ---- */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { font-size:16px; scroll-behavior:smooth; -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; }
body { font-family:var(--font-family); color:var(--color-text); line-height:var(--line-height); background:var(--color-bg); overflow-x:hidden; }
img { max-width:100%; height:auto; display:block; }
a { color:var(--color-primary); text-decoration:none; transition:color var(--transition); }
a:hover { color:var(--color-primary-dark); }
ul,ol { list-style:none; }
button { font-family:inherit; cursor:pointer; border:none; background:none; }

/* ---- Typography ---- */
h1,h2,h3,h4,h5,h6 { color:var(--color-text-dark); font-weight:700; line-height:1.3; }
h1 { font-size:clamp(2rem,5vw,3.5rem); letter-spacing:-0.02em; }
h2 { font-size:clamp(1.5rem,3vw,2.25rem); }
h3 { font-size:clamp(1.125rem,2vw,1.5rem); }
h4 { font-size:1.125rem; }
p { margin-bottom:1rem; }
p:last-child { margin-bottom:0; }
.lead { font-size:1.125rem; color:var(--color-text); line-height:1.8; }
.text-center { text-align:center; }

/* ---- Layout ---- */
.container { max-width:var(--max-width); margin:0 auto; padding:0 24px; }
.section { padding:96px 0; }
.section--alt { background:var(--color-bg-alt); }
.section--primary { background:var(--color-primary); color:var(--color-text-white); }
.section--primary h2,.section--primary h3,.section--primary p,.section--primary .lead { color:var(--color-text-white); }
.section--primary .section-label { color:rgba(255,255,255,0.7); }
.section--dark { background:var(--color-bg-dark); color:var(--color-text-white); }
.section--dark h2,.section--dark h3,.section--dark p { color:var(--color-text-white); }
.section-header { text-align:center; margin-bottom:64px; }
.section-header h2 { margin-bottom:16px; }
.section-header .lead { max-width:700px; margin:0 auto; }
.section-label { display:inline-block; font-size:0.75rem; font-weight:700; letter-spacing:0.15em; text-transform:uppercase; color:var(--color-primary); margin-bottom:8px; }

/* ---- Grid ---- */
.grid { display:grid; gap:32px; }
.grid--2 { grid-template-columns:repeat(2,1fr); }
.grid--3 { grid-template-columns:repeat(3,1fr); }
.grid--4 { grid-template-columns:repeat(4,1fr); }

/* ---- Buttons ---- */
.btn { display:inline-flex; align-items:center; gap:8px; padding:14px 32px; font-size:1rem; font-weight:500; border-radius:var(--border-radius); transition:all var(--transition); text-decoration:none; cursor:pointer; }
.btn--primary { background:var(--color-primary); color:#fff; border:2px solid var(--color-primary); }
.btn--primary:hover { background:var(--color-primary-dark); border-color:var(--color-primary-dark); color:#fff; transform:translateY(-2px); box-shadow:var(--shadow-md); }
.btn--outline { background:transparent; color:var(--color-primary); border:2px solid var(--color-primary); }
.btn--outline:hover { background:var(--color-primary); color:#fff; transform:translateY(-2px); }
.btn--white { background:#fff; color:var(--color-primary); border:2px solid #fff; }
.btn--white:hover { background:transparent; color:#fff; transform:translateY(-2px); }
.btn--outline-white { background:transparent; color:#fff; border:2px solid rgba(255,255,255,0.5); }
.btn--outline-white:hover { background:#fff; color:var(--color-primary); border-color:#fff; transform:translateY(-2px); }
.btn-group { display:flex; gap:16px; flex-wrap:wrap; }

/* ---- Header ---- */
.site-header { position:fixed; top:0; left:0; right:0; z-index:1000; background:rgba(255,255,255,0.95); backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px); border-bottom:1px solid var(--color-border); transition:all var(--transition); }
.site-header.scrolled { box-shadow:var(--shadow-sm); }
.header-inner { display:flex; align-items:center; justify-content:space-between; height:72px; }
.logo { display:flex; flex-direction:column; text-decoration:none; }
.logo-title { font-size:0.7rem; font-weight:500; letter-spacing:0.08em; text-transform:uppercase; color:var(--color-text-light); }
.logo-name { font-size:1.1rem; font-weight:700; color:var(--color-primary); letter-spacing:0.02em; }
.main-nav { display:flex; align-items:center; gap:32px; }
.nav-link { font-size:0.9rem; font-weight:500; color:var(--color-text); transition:color var(--transition); position:relative; }
.nav-link:hover,.nav-link.active { color:var(--color-primary); }
.nav-link.active::after { content:''; position:absolute; bottom:-4px; left:0; right:0; height:2px; background:var(--color-primary); border-radius:1px; }
.nav-toggle { display:none; width:32px; height:32px; flex-direction:column; justify-content:center; gap:5px; }
.nav-toggle span { display:block; width:100%; height:2px; background:var(--color-text-dark); border-radius:1px; transition:all var(--transition); }
.nav-toggle.active span:nth-child(1) { transform:rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity:0; }
.nav-toggle.active span:nth-child(3) { transform:rotate(-45deg) translate(5px,-5px); }

/* ---- Hero ---- */
.hero { position:relative; min-height:85vh; display:flex; align-items:center; padding-top:72px; background:linear-gradient(135deg,var(--color-bg-dark) 0%,var(--color-primary-darker) 100%); overflow:hidden; }
.hero-bg { position:absolute; inset:0; z-index:0; }
.hero-bg img { width:100%; height:100%; object-fit:cover; opacity:0.3; }
.hero-overlay { position:absolute; inset:0; background:linear-gradient(135deg,rgba(11,31,56,0.85) 0%,rgba(0,80,127,0.7) 100%); z-index:1; }
.hero-content { position:relative; z-index:2; max-width:720px; }
.hero-label { display:inline-block; font-size:0.8rem; font-weight:500; letter-spacing:0.15em; text-transform:uppercase; color:var(--color-accent-warm); margin-bottom:16px; }
.hero h1 { color:#fff; margin-bottom:24px; }
.hero .lead { color:rgba(255,255,255,0.85); font-size:1.25rem; margin-bottom:40px; }
.hero .btn-group { margin-top:8px; }

/* ---- Cards ---- */
.card { background:#fff; border-radius:var(--border-radius-lg); overflow:hidden; box-shadow:var(--shadow-sm); transition:all var(--transition); border:1px solid var(--color-border); }
.card:hover { transform:translateY(-4px); box-shadow:var(--shadow-md); }
.card-img { height:220px; overflow:hidden; }
.card-img img { width:100%; height:100%; object-fit:cover; transition:transform var(--transition-slow); }
.card:hover .card-img img { transform:scale(1.05); }
.card-body { padding:28px; }
.card-body h3 { margin-bottom:12px; }
.card-body p { color:var(--color-text); font-size:0.95rem; }
.card-link { display:inline-flex; align-items:center; gap:6px; font-weight:500; font-size:0.9rem; color:var(--color-primary); margin-top:16px; }
.card-link:hover { gap:10px; }
.card-link svg { width:16px; height:16px; transition:transform var(--transition); }
.card-link:hover svg { transform:translateX(4px); }

/* ---- Stats ---- */
.stats-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:32px; text-align:center; }
.stat-item { padding:24px; }
.stat-number { font-size:clamp(2.5rem,5vw,3.5rem); font-weight:700; color:#fff; line-height:1.1; margin-bottom:8px; }
.stat-label { font-size:0.9rem; font-weight:400; color:rgba(255,255,255,0.85); }

/* ---- Timeline ---- */
.timeline { position:relative; padding-left:40px; }
.timeline::before { content:''; position:absolute; left:15px; top:0; bottom:0; width:2px; background:var(--color-border); }
.timeline-item { position:relative; margin-bottom:48px; }
.timeline-item:last-child { margin-bottom:0; }
.timeline-dot { position:absolute; left:-33px; top:4px; width:14px; height:14px; border-radius:50%; background:var(--color-primary); border:3px solid var(--color-primary-light); }
.timeline-year { font-size:0.85rem; font-weight:700; color:var(--color-primary); margin-bottom:4px; }
.timeline-item h3 { margin-bottom:8px; }

/* ---- News Cards ---- */
.news-card { display:flex; gap:24px; padding:24px; background:#fff; border-radius:var(--border-radius-lg); border:1px solid var(--color-border); transition:all var(--transition); }
.news-card:hover { box-shadow:var(--shadow-md); transform:translateY(-2px); }
.news-date { flex-shrink:0; width:64px; text-align:center; }
.news-date-day { font-size:1.75rem; font-weight:700; color:var(--color-primary); line-height:1; }
.news-date-month { font-size:0.75rem; font-weight:500; text-transform:uppercase; color:var(--color-text-light); letter-spacing:0.05em; }
.news-content h3 { font-size:1.1rem; margin-bottom:4px; }
.news-content p { font-size:0.9rem; margin-bottom:0; }

/* ---- Feature List ---- */
.feature-list { display:grid; gap:24px; }
.feature-item { display:flex; gap:20px; padding:24px; border-radius:var(--border-radius-lg); transition:background var(--transition); }
.feature-item:hover { background:var(--color-bg-alt); }
.feature-icon { flex-shrink:0; width:48px; height:48px; display:flex; align-items:center; justify-content:center; border-radius:var(--border-radius); background:var(--color-primary-light); color:var(--color-primary); font-size:1.5rem; }
.feature-text h4 { margin-bottom:4px; }
.feature-text p { font-size:0.9rem; margin-bottom:0; }

/* ---- Person Card ---- */
.person-card { display:flex; gap:32px; align-items:flex-start; padding:32px; background:#fff; border-radius:var(--border-radius-lg); border:1px solid var(--color-border); }
.person-img { flex-shrink:0; width:120px; height:120px; border-radius:50%; overflow:hidden; background:var(--color-primary-light); display:flex; align-items:center; justify-content:center; color:var(--color-primary); font-size:3rem; }
.person-info h3 { margin-bottom:4px; }
.person-role { font-size:0.85rem; font-weight:500; color:var(--color-primary); margin-bottom:12px; }

/* ---- CTA Section ---- */
.cta-section { background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-accent) 100%); padding:80px 0; text-align:center; }
.cta-section h2,.cta-section p { color:#fff; }
.cta-section .lead { max-width:600px; margin:0 auto 32px; color:rgba(255,255,255,0.9); }

/* ---- Footer ---- */
.site-footer { background:var(--color-bg-dark); color:rgba(255,255,255,0.7); padding:64px 0 32px; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:48px; margin-bottom:48px; }
.footer-brand .logo-title { color:rgba(255,255,255,0.5); }
.footer-brand .logo-name { color:#fff; }
.footer-brand p { font-size:0.9rem; margin-top:16px; color:rgba(255,255,255,0.6); }
.footer-col h4 { color:#fff; font-size:0.85rem; font-weight:700; text-transform:uppercase; letter-spacing:0.1em; margin-bottom:16px; }
.footer-col a { display:block; color:rgba(255,255,255,0.75); font-size:0.9rem; padding:4px 0; transition:color var(--transition); }
.footer-col a:hover { color:#fff; }
.footer-bottom { border-top:1px solid rgba(255,255,255,0.1); padding-top:24px; display:flex; justify-content:space-between; align-items:center; font-size:0.85rem; color:rgba(255,255,255,0.6); }

/* ---- Animations ---- */
.fade-in { opacity:0; transform:translateY(24px); transition:opacity 0.6s ease,transform 0.6s ease; }
.fade-in.visible { opacity:1; transform:translateY(0); }
.fade-in-left { opacity:0; transform:translateX(-24px); transition:opacity 0.6s ease,transform 0.6s ease; }
.fade-in-left.visible { opacity:1; transform:translateX(0); }

@keyframes float { 0%,100% { transform:translateY(0); } 50% { transform:translateY(-8px); } }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:0.7; } }

/* ---- Partner Logos ---- */
.partner-strip { display:flex; justify-content:center; align-items:center; gap:48px; flex-wrap:wrap; padding:32px 0; opacity:0.6; }
.partner-strip span { font-size:0.85rem; font-weight:500; color:var(--color-text); white-space:nowrap; }

/* ---- Responsive ---- */
@media (max-width:1024px) {
  .grid--3 { grid-template-columns:repeat(2,1fr); }
  .grid--4 { grid-template-columns:repeat(2,1fr); }
  .stats-grid { grid-template-columns:repeat(2,1fr); }
  .footer-grid { grid-template-columns:repeat(2,1fr); }
}
@media (max-width:768px) {
  .section { padding:64px 0; }
  .section-header { margin-bottom:40px; }
  .grid--2,.grid--3,.grid--4 { grid-template-columns:1fr; }
  .stats-grid { grid-template-columns:repeat(2,1fr); gap:24px; }
  .hero { min-height:70vh; }
  .main-nav { position:fixed; top:72px; left:0; right:0; background:#fff; flex-direction:column; padding:24px; gap:16px; transform:translateY(-110%); transition:transform var(--transition); border-bottom:1px solid var(--color-border); box-shadow:var(--shadow-lg); }
  .main-nav.open { transform:translateY(0); }
  .nav-toggle { display:flex; }
  .person-card { flex-direction:column; align-items:center; text-align:center; }
  .news-card { flex-direction:column; gap:12px; }
  .footer-grid { grid-template-columns:1fr; gap:32px; }
  .footer-bottom { flex-direction:column; gap:8px; text-align:center; }
  .btn-group { flex-direction:column; align-items:stretch; }
  .btn { justify-content:center; }
}
@media (max-width:480px) {
  .stats-grid { grid-template-columns:1fr 1fr; }
  .partner-strip { gap:24px; }
  .container { padding:0 16px; }
}