/* ============================================================
   Darmstädter Ontologenkreis — modernisiertes Stylesheet
   Basiert auf dem Farb- und Schriftkonzept von do.css, neu
   aufgebaut mit CSS Grid, Custom Properties und einem
   CSS-only Hamburger-Menü (kein JavaScript nötig).
   ============================================================ */

:root {
  --c-bg: #c0c0c0;       /* Seitenhintergrund außerhalb der Karte */
  --c-panel: #caba9b;    /* Header / Nav / Footer */
  --c-surface: #ebe5d9;  /* Content-Hintergrund */
  --c-card: #ffffff;     /* Karten (section/article) */
  --c-accent: #7d5a4f;   /* Buttons, Akzente */
  --c-text: #4f4f4f;     /* Überschriften, Nav, Rahmen */

  --font-serif: "Times New Roman", Times, FreeSerif, serif;
  --font-sans: "Arial", "Verdana", "Helvetica", sans-serif;

  --radius: 1em;
  --radius-card: 0.7em;
  --shadow-card: 0.1em 0.2em 0.25em #4f4f4f;
}

* {
  box-sizing: border-box;
}

html {
  background-color: var(--c-bg);
  scroll-padding-top: 6.5em;
  overflow-x: hidden; /* kein horizontales Scrollen mehr auf schmalen Screens */
}

body {
  margin: 0;
  font-family: var(--font-serif);
  background-color: var(--c-surface);
  max-width: 75em;
  margin-inline: auto;
  border-radius: var(--radius);
}

h1, h2, h3, h4,
.titel, .untertitel, nav {
  font-family: var(--font-sans);
}

p {
  font-size: clamp(1rem, 0.94rem + 0.25vw, 1.15rem);
  line-height: 1.5;
  margin: 0 0 0.7em 0;
  hyphens: auto;
  word-break: normal;
  quotes: "\201E" "\201D";
}

h1, h2, h3 {
  font-weight: bold;
  color: var(--c-text);
}

h1 {
  font-size: clamp(1.3rem, 1.15rem + 0.6vw, 1.6rem);
  margin: 0.8em 1em 0.6em 1em;
}

h2 {
  font-size: clamp(1.15rem, 1.05rem + 0.4vw, 1.3rem);
  margin: 1.4em 0 0.7em 0;
}

section h2:first-child,
article h2:first-child {
  margin-top: 0;
}

h3 {
  font-size: 1.05rem;
  margin: 0.6em 0 0.3em 0;
}

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

figure {
  margin: 0.5em 0;
}

hr {
  width: 50%;
  margin: 1em auto;
  border: none;
  border-top: 1px solid var(--c-text);
}

/* -------- Termine / Vorträge (Archiv & Ausblick) -------- */

time,
.termin {
  display: block;
  font-style: normal;
  font-weight: bold;
  margin-bottom: 0.3em;
}

.referent,
.institut {
  display: block;
  font-style: italic;
  font-weight: normal;
  margin: 0.2em 0 0.5em 0;
}

.referent a {
  text-decoration: none;
}

.referent a:hover,
.referent a:focus {
  background-color: var(--c-bg);
}

.vortrag {
  background-color: var(--c-card);
  margin: 0.5em 0 1em 1em;
}

/* Im Archiv werden Termine dezenter dargestellt als im Ausblick */
#archive time,
#archive .termin {
  font-weight: normal;
  text-align: right;
}

/* -------- Layout-Rahmen -------- */

.page {
  padding: 0 0.75em;
}

/* -------- Kopf + Menü: gemeinsam fixiert -------- */

.site-top {
  position: sticky;
  top: 0;
  z-index: 100;
  border-radius: var(--radius) var(--radius) 0 0;
  box-shadow: 0 0.15em 0.3em rgba(0, 0, 0, 0.25);
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1em;
  justify-content: space-between;
  background-color: var(--c-panel);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.6em 0.8em;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8em;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.brand .logo {
  height: 3.4em;
  width: 3.4em;
  flex: none;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.titel {
  font-weight: bold;
  font-size: clamp(1.15rem, 1rem + 0.7vw, 1.5rem);
}

.untertitel {
  font-style: italic;
  font-size: clamp(0.85rem, 0.78rem + 0.35vw, 1.05rem);
}

/* -------- Hamburger-Menü (nur CSS) -------- */

.menu-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.hamburger {
  display: none;
  flex: none;
  width: 2.4em;
  height: 2.4em;
  border-radius: 0.4em;
  border: 1px solid var(--c-text);
  background: transparent;
  cursor: pointer;
  padding: 0;
  position: relative;
}

.hamburger span,
.hamburger span::before,
.hamburger span::after {
  content: "";
  position: absolute;
  left: 0.5em;
  right: 0.5em;
  height: 2px;
  background: var(--c-text);
}

.hamburger span {
  top: 50%;
  transform: translateY(-50%);
}

.hamburger span::before {
  top: -0.5em;
}

.hamburger span::after {
  top: 0.5em;
}

/* -------- Menü-Leiste -------- */

.site-nav {
  background-color: var(--c-panel);
  font-weight: bold;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0 0.4em;
  display: flex;
  flex-wrap: wrap;
}

.site-nav li {
  margin: 0.3em 0.2em;
}

.site-nav li > a,
.site-nav li > span {
  display: block;
  padding: 0.5em 0.7em;
  border-radius: 0.5em 0.5em 0 0;
  border: 1px solid var(--c-text);
  border-bottom: none;
  color: var(--c-text);
  text-decoration: none;
}

.site-nav li.self span,
.site-nav li a:hover,
.site-nav li a:focus {
  background-color: var(--c-surface);
}

/* -------- Hauptspalten und Nebenspalten -------- */

.content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-bottom: 0.5em;
}

main, aside {
  min-width: 0;
}

main {
  padding: 0 1em;
}

aside {
  padding: 0 1em;
}

section, article {
  background-color: var(--c-card);
  border: 1px solid var(--c-text);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 0.9em;
  margin: 0.7em 0 1em 0;
  scroll-margin-top: 6.5em;
}

/* -------- Bilder in der Seitenspalte (z.B. QR-Codes auf Anreise) -------- */

aside img {
  display: block;
  margin: 0.5em auto 0 auto;
}

/* -------- Karten-Ausschnitt -------- */

#map {
  padding: 0 1em;
  margin-top: 0.5em;
}

#map iframe {
  width: 100%;
  height: 320px;
  border: 1px solid var(--c-text);
  border-radius: 0.5em;
  display: block;
}

/* -------- Footer -------- */

.site-footer {
  margin-top: 1em;
  padding: 0.8em;
  background-color: var(--c-panel);
  border-top: 0.2em solid var(--c-text);
  border-radius: 0 0 var(--radius) var(--radius);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--c-text);
}

/* -------- Button -------- */

.button {
  display: inline-block;
  padding: 0.5em 1em;
  border-radius: 0.5em;
  text-decoration: none;
  background-color: var(--c-accent);
  border: 2px solid white;
  background-clip: padding-box;
  font-weight: bold;
  color: white;
}

.button:hover,
.button:focus {
  filter: brightness(90%);
}

/* ============================================================
   Ab hier: Desktop / breitere Bildschirme
   ============================================================ */

@media (min-width: 50em) {
  .page {
    padding: 0 1.5em;
  }

  .hamburger {
    display: none;
  }

  .site-nav ul {
    flex-wrap: nowrap;
  }

  .content {
    grid-template-columns: 65% 35%;
    align-items: start;
  }
}

/* ============================================================
   Ab hier: Schmale Bildschirme — Hamburger aktiv
   ============================================================ */

@media (max-width: 49.99em) {
  .hamburger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .site-nav ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.35em;
    padding: 0.4em;
  }

  .site-nav li {
    margin: 0;
  }

  .site-nav li a,
  .site-nav li span {
    padding: 0.35em 0.4em;
    border-radius: 0.4em;
    font-size: 0.85rem;
    line-height: 1.2;
    text-align: center;
  }

  .menu-toggle:checked ~ .site-nav {
    max-height: min(70vh, 22em);
    overflow-y: auto;
  }
}