/* ==========================================================================
   Ina Schieferdecker – Website Stylesheet
   Eigenbau-Template basierend auf Keynote-Farbpalette
   Stand: 2026-10-20
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens (CSS Custom Properties)
   -------------------------------------------------------------------------- */

:root {
  /* Primärfarben (aus Keynote KB:13-19) */
  --color-primary: #2B5580;
  --color-primary-dark: #1d3d5e;
  --color-primary-light: #1565c0;
  --color-secondary: #1F90CC;

  /* Grautöne (kontrastkorrigiert, D4) */
  --color-text: #000000;
  --color-text-muted: #3a4a5c;
  --color-gray: #717171;

  /* Flächen */
  --color-bg: #ffffff;
  --color-surface: #f5f5f5;
  --color-surface-blue: #eef4fb;
  --color-surface-blue-mid: #dce8f6;

  /* Links */
  --color-link: #1565c0;
  --color-link-hover: #1d3d5e;
  --color-link-visited: #2B5580;

  /* Akzentfarben (kontrastkorrigiert) */
  --color-accent-green: #2e7d32;
  --color-accent-orange: #c14400;
  --color-accent-yellow: #8b7108;
  --color-accent-red: #c50e1f;
  --color-accent-fazit: #B3134F;

  /* Rahmen */
  --color-border: #dcdcdc;
  --color-border-blue: #9db8d9;

  /* Typografie – System Stack (D1) */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "DejaVu Sans Mono", Menlo, Consolas, monospace;

  /* Fluid Typography Scale */
  --text-xs: 0.875rem;
  --text-sm: 0.9375rem;
  --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --text-2xl: clamp(1.375rem, 1.2rem + 0.9vw, 1.625rem);
  --text-3xl: clamp(1.75rem, 1.4rem + 1.8vw, 2.25rem);

  --line-height: 1.6;
  --line-height-tight: 1.3;

  /* Abstände (4px-Raster) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout */
  --max-width: 72rem;
  --content-width: 68ch;
  --gutter: clamp(1rem, 4vw, 2rem);

  /* Formen */
  --radius-sm: 2px;
  --radius: 4px;
  --radius-lg: 8px;

  /* Fokus */
  --focus-ring: 3px solid var(--color-link);
  --focus-offset: 2px;

  /* Transitions */
  --transition-fast: 150ms ease;
}

/* --------------------------------------------------------------------------
   2. Dark Mode (D3: optional)
   -------------------------------------------------------------------------- */

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #adc8e7;
    --color-primary-dark: #c6d9ef;
    --color-primary-light: #4fc3f7;

    --color-text: #eef4fb;
    --color-text-muted: #c6d9ef;

    --color-bg: #0d1b3e;
    --color-surface: #1d3d5e;
    --color-surface-blue: #1d3d5e;
    --color-surface-blue-mid: #2B5580;

    --color-link: #4fc3f7;
    --color-link-hover: #adc8e7;
    --color-link-visited: #c6d9ef;

    --color-border: #2B5580;
    --color-border-blue: #4fc3f7;
  }
}

/* --------------------------------------------------------------------------
   3. Reset & Base
   -------------------------------------------------------------------------- */

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

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* --------------------------------------------------------------------------
   4. Typography
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--space-4);
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-primary);
}

h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-12);
}

h3 {
  font-size: var(--text-xl);
  margin-top: var(--space-8);
}

h4 {
  font-size: var(--text-lg);
}

p {
  margin-top: 0;
  margin-bottom: var(--space-4);
  max-width: var(--content-width);
}

/* Links – immer unterstrichen (WCAG 1.4.1) */
a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-link-hover);
}

a:visited {
  color: var(--color-link-visited);
}

a:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

/* --------------------------------------------------------------------------
   5. Layout
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.content {
  max-width: var(--content-width);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 48em) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-sidebar {
    grid-template-columns: 2fr 1fr;
  }
}

/* --------------------------------------------------------------------------
   6. Header & Navigation
   -------------------------------------------------------------------------- */

.site-header {
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.brand:hover {
  color: var(--color-primary);
}

.brand-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 1px var(--color-primary);
}

@media (min-width: 48em) {
  .brand-avatar {
    width: 48px;
    height: 48px;
  }
}

.brand-name {
  font-weight: 600;
  font-size: var(--text-base);
  line-height: 1.2;
}

/* Navigation
   Mobile: brand and controls share the first row; the links of both lists
   flow together below them, so no link ends up alone on a line.
   Desktop: two rows, one per list. */
.site-nav-rows {
  order: 3;
  flex-basis: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-3);
}

.site-nav {
  display: contents;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav li {
  margin-bottom: 0;
}

.site-nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  padding: 0.375rem 0;
}

@media (min-width: 48em) {
  .site-nav-rows {
    order: 0;
    flex-basis: auto;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: var(--space-2);
  }

  .site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
  }

  .site-nav li {
    margin-bottom: var(--space-2);
  }

  .site-nav a {
    display: inline;
    font-size: inherit;
    padding: var(--space-1) 0;
  }
}

.site-nav a:hover {
  color: var(--color-link);
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 600;
  border-bottom: 2px solid var(--color-primary);
}

/* Back to navigation link */
.back-to-nav {
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--color-link);
  text-decoration: none;
  margin-left: var(--space-2);
}

.back-to-nav:hover {
  text-decoration: underline;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-bg);
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: var(--space-2);
}

/* --------------------------------------------------------------------------
   7. Main Content
   -------------------------------------------------------------------------- */

main {
  padding-block: var(--space-12);
}

section {
  margin-bottom: var(--space-16);
}

/* --------------------------------------------------------------------------
   8. Components
   -------------------------------------------------------------------------- */

/* Card */
.card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.card-blue {
  background: var(--color-surface-blue);
  border-color: var(--color-border-blue);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.card-link:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

/* Fazit / Highlight Box (D5: sparsam) */
.fazit {
  padding: var(--space-4) var(--space-6);
  background: color-mix(in srgb, var(--color-accent-fazit) 10%, var(--color-bg));
  border-left: 5px solid var(--color-accent-fazit);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.fazit p:last-child {
  margin-bottom: 0;
}

/* Profile Portrait */
.portrait {
  aspect-ratio: 3/4;
  object-fit: cover;
  object-position: 50% 30%;
  border-radius: var(--radius-lg);
  width: 160px;
}

@media (min-width: 48em) {
  .portrait {
    width: 240px;
  }
}

/* Lead Text */
.lead {
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-style: italic;
}

/* Lists */
ul, ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-4);
}

li {
  margin-bottom: var(--space-2);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-6);
}

th, td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-primary);
  color: var(--color-bg);
  font-weight: 600;
}

tr:nth-child(even) {
  background: var(--color-surface-blue);
}

/* Timeline (E3: behalten) */
.timeline {
  list-style: none;
  padding: 0;
}

.timeline-item {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 48em) {
  .timeline-item {
    grid-template-columns: 200px 1fr;
  }
}

.timeline-year {
  font-weight: 600;
  color: var(--color-primary);
}

/* Publication List */
.pub-list {
  list-style: none;
  padding: 0;
}

.pub-item {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.pub-title {
  font-weight: 600;
}

.pub-venue {
  color: var(--color-text-muted);
  font-style: italic;
}

.pub-links {
  margin-top: var(--space-2);
  display: flex;
  gap: var(--space-4);
}

/* BibTeX inline view (assets/js/bibtex.js) */
.bib-preview {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.bib-preview pre {
  margin: 0;
  max-width: 100%;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.bib-actions {
  margin-top: var(--space-2);
}

/* Abstract of a publication, collapsed by default */
.pub-abstract {
  margin-top: var(--space-2);
  max-width: var(--content-width);
}

.pub-abstract summary {
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-link);
}

.pub-abstract summary:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.pub-abstract p {
  margin: var(--space-2) 0 0;
}

/* List search (assets/js/list-search.js) */
.list-search {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-6);
}

.list-search[hidden] {
  display: none;
}

.list-search input,
.list-search select {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border-blue);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  font-size: var(--text-sm);
}

.list-search input {
  flex: 1 1 14rem;
  min-width: 0;
}

.list-search input:focus-visible,
.list-search select:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.search-status {
  flex-basis: 100%;
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.search-status:empty {
  display: none;
}

/* --------------------------------------------------------------------------
   9. Footer
   -------------------------------------------------------------------------- */

.site-footer {
  padding-block: var(--space-8);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Icons */
.icon {
  width: 1.25em;
  height: 1.25em;
  fill: currentColor;
  vertical-align: middle;
  flex-shrink: 0;
}

/* Contact Email */
.contact-email {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
}

/* Social Icons */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface-blue);
  color: var(--color-primary);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.social-links a:hover {
  background: var(--color-primary);
  color: var(--color-bg);
}

.social-links .icon {
  width: 1.5em;
  height: 1.5em;
}

/* --------------------------------------------------------------------------
   10. Utilities
   -------------------------------------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

/* --------------------------------------------------------------------------
   11. Dark Mode Toggle & Language Switcher
   -------------------------------------------------------------------------- */

.site-controls {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  margin-left: auto;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-icon:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.btn-icon .icon {
  width: 1.25em;
  height: 1.25em;
}

.lang-switch {
  font-size: var(--text-sm);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text-muted);
  text-decoration: none;
}

.lang-switch:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

/* Dark mode manual toggle */
[data-theme="dark"] {
  --color-primary: #adc8e7;
  --color-primary-dark: #c6d9ef;
  --color-primary-light: #4fc3f7;
  --color-text: #eef4fb;
  --color-text-muted: #c6d9ef;
  --color-bg: #0d1b3e;
  --color-surface: #1d3d5e;
  --color-surface-blue: #1d3d5e;
  --color-surface-blue-mid: #2B5580;
  --color-link: #4fc3f7;
  --color-link-hover: #adc8e7;
  --color-link-visited: #c6d9ef;
  --color-border: #2B5580;
  --color-border-blue: #4fc3f7;
}

/* --------------------------------------------------------------------------
   12. Timeline
   -------------------------------------------------------------------------- */

.timeline-grid {
  display: grid;
  gap: var(--space-6);
}

.timeline-item {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-surface);
  border-radius: var(--radius);
}

@media (min-width: 48em) {
  .timeline-item {
    grid-template-columns: 120px 1fr;
    align-items: start;
  }
}

.timeline-image {
  width: 100px;
  height: auto;
  border-radius: var(--radius);
}

.timeline-content h3 {
  font-size: var(--text-lg);
  margin-top: 0;
  margin-bottom: var(--space-2);
}

.timeline-content p {
  margin-bottom: 0;
}