/* === Design tokens (per requirements §9) === */
:root {
  --color-bg: #0d0d0d;
  --color-surface: #161616;
  --color-border: #2a2a2a;
  --color-text: #e8e8e8;
  --color-text-muted: #888888;
  /* Dot typeface gets its own color: deliberately lower-contrast against
     the background than --color-text. Dim, never bright. */
  --color-dot-text: #6a6a6a;

  --font-sans: "Neue Haas Grotesk Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --font-size-base: 0.875rem;
  --font-size-sm: 0.75rem;
  --font-size-lg: 1rem;
  --font-weight-normal: 300;
  --font-weight-medium: 400;
  --line-height-base: 1.5;
  --letter-spacing-caps: 0.08em;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-6: 3rem;
  --space-8: 4rem;

  --content-max-width: 1400px;
  --nav-height: 3rem;
  --grid-gutter: 0.25rem;

  --transition-fast: 120ms ease;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #f5f5f5;
    --color-surface: #ffffff;
    --color-border: #e0e0e0;
    --color-text: #111111;
    --color-text-muted: #666666;
    --color-dot-text: #b8b8b8;   /* dim against light bg */
  }
}

[data-theme="dark"] {
  --color-bg: #0d0d0d;
  --color-surface: #161616;
  --color-border: #2a2a2a;
  --color-text: #e8e8e8;
  --color-text-muted: #888888;
  --color-dot-text: #6a6a6a;     /* dim against dark bg */
}

[data-theme="light"] {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-border: #e0e0e0;
  --color-text: #111111;
  --color-text-muted: #666666;
  --color-dot-text: #b8b8b8;     /* dim against light bg */
}

/* === Reset + base === */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-base);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

/* === Site nav === */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-3);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-nav .brand {
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-caps);
  color: var(--color-text);
}
.site-nav nav {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}
.site-nav nav a {
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-caps);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.site-nav nav a:hover,
.site-nav nav a[aria-current="page"] {
  color: var(--color-text);
}
#theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: var(--font-size-base);
  line-height: 1;
}

/* === Footer === */
.site-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  padding: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-8);
}

/* === Homepage full-bleed slideshow ===
   Fills the viewport minus nav. Image keeps native aspect ratio via
   object-fit: contain — never cropped, never letter-boxed by force. */
.home-slideshow {
  position: relative;
  width: 100%;
  height: calc(100vh - var(--nav-height) - var(--space-4));
  min-height: 320px;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
.home-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 800ms ease;
}
.home-slide.is-active {
  opacity: 1;
  pointer-events: auto;
}
.home-slide img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}
/* Hide main padding on the homepage — slideshow wants the full viewport. */
body:has(.home-slideshow) main { padding: 0; max-width: none; }

/* === Waterfall (masonry-style) galleries ===
   CSS columns let each image keep its native aspect ratio. Cards stay
   intact via break-inside: avoid. NO image cropping anywhere. */
.cover-grid,
.topic-grid,
.event-grid {
  column-count: 3;
  column-gap: var(--grid-gutter);
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-3);
}
@media (max-width: 900px) {
  .cover-grid, .topic-grid, .event-grid { column-count: 2; }
}
@media (max-width: 540px) {
  .cover-grid, .topic-grid, .event-grid { column-count: 1; }
}

.cover img,
.topic-card img,
.event-card img {
  width: 100%;
  height: auto;
  display: block;
}
.cover, .topic-card, .event-card {
  display: block;
  width: 100%;
  margin-bottom: var(--grid-gutter);
  break-inside: avoid;
  transition: opacity var(--transition-fast);
}
.cover:hover, .topic-card:hover, .event-card:hover { opacity: 0.85; }

.topic-card-meta,
.event-card-meta {
  display: flex;
  justify-content: space-between;
  padding: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
.topic-card-title, .event-card-title { color: var(--color-text); }

/* === Page chrome === */
main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-3);
}
h1 {
  font-weight: var(--font-weight-normal);
  font-size: var(--font-size-lg);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-caps);
  margin: var(--space-3) 0 var(--space-2);
}
.back-link {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  display: inline-block;
  margin-bottom: var(--space-2);
}
.back-link:hover { color: var(--color-text); }
.event-description {
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

/* === Event page: contact sheet (default) ===
   Waterfall layout — each thumbnail keeps its native aspect ratio. */
.event-page .contactsheet-view {
  column-count: 3;
  column-gap: var(--grid-gutter);
}
@media (max-width: 900px) { .event-page .contactsheet-view { column-count: 2; } }
@media (max-width: 540px) { .event-page .contactsheet-view { column-count: 1; } }
.event-page .slide-thumb {
  display: block;
  width: 100%;
  margin-bottom: var(--grid-gutter);
  break-inside: avoid;
}
.event-page .slide-thumb img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity var(--transition-fast);
}
.event-page .slide-thumb:hover img { opacity: 0.85; }
.event-page .slideshow-view { display: none; }

/* === Event page: slideshow (any slide targeted) === */
.event-page:has(.slide-full:target) .contactsheet-view { display: none; }
.event-page:has(.slide-full:target) .slideshow-view { display: block; }

.slide-full { display: none; margin: 0; }
.slide-full:target { display: block; }
.slide-full img { max-height: 85vh; margin: 0 auto; object-fit: contain; }
.slide-full figcaption {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  align-items: center;
  padding: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}
.slide-full figcaption a { color: var(--color-text); }
.slide-full figcaption a:hover { color: var(--color-text-muted); }
.slide-full .counter { font-variant-numeric: tabular-nums; }

/* === Forms === */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 32rem;
}
.contact-form input,
.contact-form textarea {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-2);
  font-family: inherit;
  font-size: var(--font-size-base);
}
.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-text-muted);
}
.contact-form textarea { min-height: 8rem; resize: vertical; }

/* Send: not a button-button — just a clickable dot-text link. */
.form-send {
  background: transparent;
  border: 0;
  padding: 0;
  margin-top: var(--space-1);
  cursor: pointer;
  align-self: flex-start;
  color: var(--color-text);
}
.form-send .dot-text { color: var(--color-text); transition: opacity var(--transition-fast); }
.form-send:hover .dot-text { opacity: 0.7; }
.form-send:disabled { cursor: not-allowed; }
.form-send:disabled .dot-text { opacity: 0.5; }

.form-error { color: var(--color-text-muted); margin-top: var(--space-1); }

/* === Dot matrix === */
.dotmatrix-container {
  width: 900px;
  max-width: 100%;
  overflow-x: auto;
  margin: var(--space-2) auto;
}
/* Dot SVGs (paragraph blocks AND inline typeface) inherit dim dot color. */
.dotmatrix-container svg,
.dot-text {
  color: var(--color-dot-text);
}
/* Where punch is wanted (page heading, brand), restore full contrast. */
h1 .dot-text,
.brand .dot-text {
  color: var(--color-text);
}

/* Typography lab page (imprint = size lab; dsgvo = font lab) */
.typeface-lab .lab-intro {
  max-width: 900px;
  margin: 0 auto var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}
.typeface-lab .lab-case {
  max-width: 900px;
  margin: 0 auto var(--space-4);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-2);
  position: relative;
}
.typeface-lab .lab-case header {
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
/* Approved fonts: subtle accent strip on the left + checkmark badge. */
.typeface-lab .lab-case--approved {
  border-left: 2px solid var(--color-text-muted);
  padding-left: var(--space-2);
}
.lab-badge {
  display: inline-block;
  font-size: var(--font-size-sm);
  letter-spacing: var(--letter-spacing-caps);
  padding: 2px 6px;
  color: var(--color-text-muted);
}
.lab-case--approved .lab-badge { color: var(--color-text); }
.lab-case--rejected .lab-badge { color: var(--color-text-muted); opacity: 0.6; }

/* Slideshow toast (Cmd+C feedback) */
#slideshow-toast {
  position: fixed;
  bottom: var(--space-3);
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-1) var(--space-3);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: var(--font-size-sm);
  letter-spacing: var(--letter-spacing-caps);
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 200ms ease;
  pointer-events: none;
  z-index: 100;
}
#slideshow-toast.visible { opacity: 1; }

/* Inline dot-text typeface — used in nav, headings, captions, counts.
   Inherits color from the parent element so :hover and aria-current work. */
.dot-text {
  display: inline-block;
  vertical-align: middle;
  color: inherit;
}
h1 .dot-text { color: var(--color-text); }

/* Honeypot — visually offscreen so bots see it, humans don't. */
.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}