:root{
  /* Universität Heidelberg corporate palette (approx.) */
  --heid-red: #C61826;       /* Rot */
  --heid-russet: #590D08;    /* Rot-Braun */
  --heid-sand: #F4F1EA;      /* Sand */
  --text: #1A1A1A;
  --muted: #6B6B6B;
  --white: #fff;
  --maxw: 1200px;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0,0,0,.12);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter",system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";color:var(--text);background:var(--heid-sand)}

/* Top bar */
.nav{position:sticky;top:0;z-index:50;background:linear-gradient(180deg,var(--heid-red),#b21320);color:var(--white);box-shadow:0 2px 8px rgba(0,0,0,.15)}
.nav-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:20px;padding:14px 20px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--white)}
.brand-mark{width:40px;height:40px;border-radius:50%;background:radial-gradient(circle at 30% 30%,#ff5a6b 0%,var(--heid-red) 45%,var(--heid-russet) 100%);box-shadow:inset 0 2px 5px rgba(255,255,255,.25)}
.brand h1{font-size:18px;line-height:1.1;margin:0;font-weight:800;letter-spacing:.3px}

.nav ul{list-style:none;margin:0;margin-left:auto;display:flex;gap:6px;padding:0}
.nav a{display:inline-block;padding:10px 14px;border-radius:999px;color:var(--white);text-decoration:none;font-weight:600;opacity:.95}
.nav a:hover,.nav a:focus{background:rgba(255,255,255,.14);opacity:1}

/* Hero */
.hero{
  background:linear-gradient(120deg, rgba(198,24,38,.05), rgba(89,13,8,.05)), url('Images/Banner.jpg');
  background-size:cover;background-position:center;color:var(--white)
}
.hero-inner{max-width:var(--maxw);margin:0 auto;padding:96px 20px 72px;display:grid;grid-template-columns:1.2fr .8fr;gap:28px}
.kicker{display:inline-block;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.15);backdrop-filter:blur(6px);font-weight:700;letter-spacing:.25px}
.hero h2{font-size:56px;line-height:1.02;margin:14px 0 12px;font-weight:900}
.hero p{font-size:18px;line-height:1.6;margin:0 0 22px;opacity:.95}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 18px;border-radius:12px;font-weight:700;text-decoration:none}
.btn-primary{background:var(--white);color:var(--heid-russet)}
.btn-ghost{border:2px solid rgba(255,255,255,.35);color:var(--white)}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 18px rgba(0,0,0,.2)}

.hero-card{align-self:start;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:18px;backdrop-filter:blur(8px)}
.hero-card h3{margin:4px 0 10px;font-size:18px}
.hero-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.tile{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:14px}
.tile .t-k{font-size:12px;opacity:.85;letter-spacing:.2px}
.tile .t-v{font-size:18px;font-weight:800}

/* Section wrapper */
section{max-width:var(--maxw);margin:0 auto;padding:56px 20px}

/* Cards */
.card{background:var(--white);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid #e6e0db}
.card-inner{padding:26px}
.section-title{font-size:32px;margin:0 0 18px}
.muted{color:var(--muted)}

/* Organized & Hosted by */
.org{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:center}
.org .badge{display:inline-block;padding:6px 12px;border-radius:999px;background:var(--heid-sand);color:var(--heid-russet);border:1px dashed var(--heid-russet);font-weight:700}

/* Sponsors */
.sponsors{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.sponsor{background:#faf8f6;border:1px dashed #d7cfc8;border-radius:12px;display:flex;align-items:center;justify-content:center;min-height:84px;font-weight:700;color:#937b6f}

/* Coming Soon page (in-page destination) */
#coming-soon .cs{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px}
#coming-soon h3{font-size:40px;margin:0 0 12px}
.pill{display:inline-block;padding:8px 12px;border-radius:999px;background:var(--heid-red);color:#fff;font-weight:800}

/* Footer */
footer{background:var(--heid-russet);color:#f8eae7}
.foot{max-width:var(--maxw);margin:0 auto;padding:28px 20px;display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.foot a{color:#fff;text-decoration:none;opacity:.9}
.foot a:hover{opacity:1;text-decoration:underline}

/* Responsive */
@media (max-width: 980px){
  .hero-inner{grid-template-columns:1fr}
  .org{grid-template-columns:1fr}
  .sponsors{grid-template-columns:repeat(2,1fr)}
}

/* Slight translucent backdrop under hero text */
.hero-text{background:rgba(0,0,0,.08);border-radius:14px;padding:12px 16px;display:inline-block;backdrop-filter:saturate(110%) blur(1px)}

/* Black outline around white hero text */
.hero h2, .hero p{
  color:#fff; /* ensure white text */
  -webkit-text-stroke: 1px rgba(0,0,0,.85);
  text-shadow:
    1px 0 0 rgba(0,0,0,.9),
    -1px 0 0 rgba(0,0,0,.9),
    0 1px 0 rgba(0,0,0,.9),
    0 -1px 0 rgba(0,0,0,.9),
    1px 1px 0 rgba(0,0,0,.9),
    -1px 1px 0 rgba(0,0,0,.9),
    1px -1px 0 rgba(0,0,0,.9),
    -1px -1px 0 rgba(0,0,0,.9);
}

/* Inverted hero CTAs (white bg, red text, thick red outline) */
.hero .btn-primary, .hero .btn-ghost{
  background:#fff;
  color: var(--heid-red);
  border: 3px solid var(--heid-red);
}
.hero .btn-primary:hover, .hero .btn-ghost:hover{
  background:#fff;
  border-color: var(--heid-russet);
}

/* Venue layout: keep three equal boxes in one row */
.venue-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:stretch}
.venue-card{position:relative;overflow:hidden;border-radius:14px;border:1px solid #e6e0db;background:#fff;box-shadow:0 6px 20px rgba(0,0,0,.08);height:240px}
.venue-card img{display:block;width:100%;height:100%;object-fit:cover}
.venue-caption{position:absolute;left:8px;bottom:8px;padding:6px 10px;border-radius:999px;background:rgba(198,24,38,.9);color:#fff;font-weight:700;font-size:12px}
/* Remove hero info box and collapse hero to single column */
.hero-card{display:none !important}
.hero-inner{grid-template-columns:1fr}

/* Hero headline: remove outline, add subtle shadow */
.hero h2{
  -webkit-text-stroke: 0 !important;
  text-shadow: 0 2px 4px rgba(0,0,0,.25) !important;
}

/* Date line: theme red + bold */
.banner-date{font-size:14px;line-height:1.4;display:block;margin-top:6px;opacity:.95;color:var(--heid-red);font-weight:800}

/* Kicker styling override: black + bold */
.hero .kicker{color:#000;font-weight:800}


/* Stronger backdrop under the date line in the banner */
.banner-date{
  font-size:14px;
  line-height:1.4;
  display:inline-block;
  margin-top:6px;
  padding:4px 10px;
  border-radius:10px;
  color:var(--heid-red);
  font-weight:800;
  background:#fff;              /* white background */
  border:2px solid var(--heid-red); /* red outline matching text */
  backdrop-filter:none;
}

/* Kicker: white text on red pill with white outline */
.hero .kicker{
  display:inline-block;
  background: var(--heid-red);
  color: #fff !important;
  font-weight: 800;
  padding: 6px 12px;
  border-radius: 999px;
  border: 2px solid #fff; /* white outline around the background */
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

/* Kicker: white text on red pill with white outline */
.hero .kicker{
  display:inline-block;
  background: var(--heid-red);
  color: #fff !important;
  font-weight: 800;
  padding: 6px 12px;
  border-radius: 999px;
  border: 2px solid #fff; /* white outline around the background */
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

/* Responsive navigation (hamburger) and layout tweaks */
#nav-toggle{ display:none; }
.nav-toggle{ display:none; cursor:pointer; align-items:center; justify-content:center; gap:6px; padding:8px; border-radius:10px; border:1px solid rgba(255,255,255,.35); }
.nav-toggle span{ display:block; width:22px; height:2px; background:#fff; }

@media (max-width: 860px){
  .nav-inner{ flex-wrap:wrap; }
  .nav-toggle{ display:inline-flex; margin-left:auto; }
  .nav .menu{ display:none; width:100%; flex-direction:column; padding:8px 0; }
  #nav-toggle:checked + label + .menu{ display:flex; }
  .nav a{ padding:12px 14px; }
  .hero-inner{ padding:72px 16px 48px; }
  .hero h2{ font-size:42px; }
}

@media (max-width: 560px){
  .hero h2{ font-size:32px; }
  .banner-date{ font-size:13px; }
  .foot{ flex-direction:column; align-items:flex-start; gap:8px; }
  .sponsors{ grid-template-columns:1fr !important; }
  .contact-grid{ grid-template-columns:1fr !important; }
}

/* Venue responsive layout: 3→2→1 columns */
@media (max-width: 860px){
  .venue-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .venue-card{height:200px}
}
@media (max-width: 560px){
  .venue-grid{grid-template-columns:1fr}
  .venue-card{height:200px}
}

/* Accessible hiding for nav checkbox */
#nav-toggle{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;border:0;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}

/* Desktop defaults: keep horizontal menu, hide the MENU toggle */
@media (min-width: 861px){
  .nav .menu{display:flex !important;flex-direction:row;width:auto}
  .nav-toggle{display:none}
}

/* Hide the checkbox accessibly */
#nav-toggle{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}

/* Mobile-first slide-down menu */
@media (max-width: 860px){
  .nav-inner{flex-wrap:wrap}
  .nav-toggle{display:inline-flex;margin-left:auto}

  /* Menu is present but collapsed */
  .nav .menu{
    display:flex;
    width:100%;
    flex-direction:column;
    padding:8px 0;
    overflow:hidden;
    max-height:0;            /* collapsed */
    opacity:0;               /* fade in */
    transform:translateY(-6px); /* slide from top */
    transition:max-height .35s ease, opacity .25s ease, transform .35s ease;
    pointer-events:none;
  }

  /* When toggled, slide down */
  #nav-toggle:checked + .nav-toggle + .menu{
    max-height:420px;        /* large enough to fit all items */
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
  }

  .nav .menu a{padding:12px 14px}
}

/* Desktop/tablet: horizontal menu, no toggle button */
@media (min-width: 861px){
  .nav .menu{display:flex !important;flex-direction:row;width:auto;max-height:none;opacity:1;transform:none;pointer-events:auto}
  .nav-toggle{display:none}
}