/* ========================================
   STRL 2026 — Workshop Website Styles
   ======================================== */

/* --- Custom Properties --- */
:root {
  --color-primary: #1a3a5c;
  --color-primary-light: #2a5a8c;
  --color-primary-dark: #0f2440;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-text: #1e293b;
  --color-text-light: #475569;
  --color-text-muted: #94a3b8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-hero-bg: #0f2440;
  --color-hero-text: #ffffff;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --max-width: 960px;
  --nav-height: 56px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(15, 36, 64, 0.95);
  backdrop-filter: blur(8px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-hero-text);
  letter-spacing: 0.5px;
}

.nav-logo:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  color: rgba(255,255,255,0.8);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(255,255,255,0.12);
  text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: all var(--transition);
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-hero-bg) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  padding: calc(var(--nav-height) + 3rem) 1.5rem 4rem;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(59,130,246,0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(59,130,246,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: url('../images/backgrounds/bremen-rathaus.webp') center 68% / cover no-repeat;
  opacity: 0.22;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-edition {
  color: rgba(255,255,255,0.7);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hero-title {
  color: var(--color-hero-text);
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.hero-meta {
  color: rgba(255,255,255,0.85);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.hero-meta a {
  color: rgba(255,255,255,0.95);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.hero-sep {
  opacity: 0.5;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.65rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
  color: #fff;
}

/* --- Sections --- */
.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 2rem;
  position: relative;
  padding-bottom: 0.75rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.subsection-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 2.5rem 0 1rem;
}

/* --- Introduction --- */
.intro-content {
  font-size: 1.05rem;
  color: var(--color-text-light);
  max-width: 800px;
}

.intro-content p {
  margin-bottom: 1rem;
}

.intro-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.highlight-card {
  text-align: center;
  padding: 1.75rem 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.highlight-icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.highlight-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.highlight-card p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* --- Topics --- */
.topics-intro {
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.topics-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  list-style: none;
  margin-bottom: 1.5rem;
}

.topics-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--color-text);
  font-size: 0.95rem;
}

.topics-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
}

.topics-note {
  color: var(--color-text-light);
  font-size: 0.9rem;
  padding: 1rem;
  background: var(--color-bg-card);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* --- Submission --- */
.submission-info {
  color: var(--color-text-light);
}

.submission-info p {
  margin-bottom: 0.75rem;
}

.submission-info ul {
  margin: 0.75rem 0 0.75rem 1.5rem;
}

.submission-info li {
  margin-bottom: 0.5rem;
}

.tba-notice {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: 6px;
  color: var(--color-primary);
  font-weight: 500;
  font-size: 0.9rem;
}

/* --- Dates --- */
.dates-grid {
  display: grid;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-card);
}

.date-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.date-item:last-child {
  border-bottom: none;
}

.date-label {
  font-weight: 500;
  color: var(--color-text);
}

.date-value {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.95rem;
}

.date-struck {
  text-decoration: line-through;
  color: var(--color-text-muted);
  font-weight: 400;
}

.date-new {
  color: #dc2626;
  margin-left: 0.75rem;
}

.dates-note {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --- Speakers --- */
.speakers-grid {
  display: grid;
  gap: 1.5rem;
}

.speaker-card {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.speaker-photo {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  border-radius: var(--radius);
  overflow: hidden;
}

.speaker-photo img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transform: translate(
      calc(var(--profile-scale, 1) * (50% - var(--profile-center-x, 50%))),
      calc(var(--profile-scale, 1) * (50% - var(--profile-center-y, 50%)))
    )
    scale(var(--profile-scale, 1));
  transform-origin: center;
}

.speaker-photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-size: 2rem;
  font-weight: 700;
}

.speaker-info h4 {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.speaker-affiliation {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.speaker-talk {
  color: var(--color-primary);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.speaker-bio {
  color: var(--color-text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* --- Schedule --- */
.schedule-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-card);
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
}

.schedule-table thead {
  background: var(--color-primary);
  color: #fff;
}

.schedule-table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.schedule-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.schedule-table tr:last-child td {
  border-bottom: none;
}

.schedule-time {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  width: 130px;
}

.schedule-title {
  display: block;
  font-weight: 500;
  color: var(--color-text);
}

.schedule-speaker {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: 0.15rem;
}

.schedule-details {
  display: block;
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-top: 0.15rem;
}

.schedule-break {
  background: var(--color-bg-alt);
}

.schedule-break .schedule-title {
  color: var(--color-text-muted);
  font-weight: 400;
  font-style: italic;
}

.schedule-keynote {
  background: rgba(59,130,246,0.04);
}

.schedule-note {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-style: italic;
}

/* --- Organizers --- */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.organizer-card {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.organizer-photo {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
}

.organizer-photo img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transform: translate(
      calc(var(--profile-scale, 1) * (50% - var(--profile-center-x, 50%))),
      calc(var(--profile-scale, 1) * (50% - var(--profile-center-y, 50%)))
    )
    scale(var(--profile-scale, 1));
  transform-origin: center;
}

.organizer-photo-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  border-radius: 50%;
}

.organizer-info h4 {
  font-size: 1rem;
  margin-bottom: 0.15rem;
}

.organizer-role {
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.15rem;
}

.organizer-affiliation {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.organizer-bio {
  color: var(--color-text-light);
  font-size: 0.85rem;
  line-height: 1.5;
  margin-top: 0.5rem;
}

/* --- Program Committee --- */
.pc-list {
  columns: 2;
  column-gap: 2rem;
  list-style: none;
}

.pc-tba {
  color: var(--color-text-muted);
  font-style: italic;
}

.pc-list li {
  padding: 0.4rem 0;
  font-size: 0.925rem;
  break-inside: avoid;
  border-bottom: 1px solid var(--color-border);
}

.pc-affiliation {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* --- Venue --- */
.venue-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.venue-info p {
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.venue-map-link {
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

/* --- Previous Editions --- */
.editions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.edition-card {
  padding: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: box-shadow var(--transition);
}

.edition-card:hover {
  box-shadow: var(--shadow-md);
}

.edition-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.edition-card p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.edition-location {
  font-weight: 500;
  color: var(--color-text-light) !important;
}

/* --- Footer --- */
.site-footer {
  padding: 2rem 0;
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.6);
  text-align: center;
  font-size: 0.85rem;
}

.site-footer a {
  color: rgba(255,255,255,0.8);
}

.site-footer a:hover {
  color: #fff;
}

.site-footer p {
  margin-bottom: 0.25rem;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-primary-dark);
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 0.75rem 1.5rem;
    border-radius: 0;
  }

  .hero {
    min-height: 420px;
    padding-top: calc(var(--nav-height) + 2rem);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-meta {
    flex-direction: column;
    gap: 0.25rem;
  }

  .hero-sep {
    display: none;
  }

  .section {
    padding: 3rem 0;
  }

  .intro-highlights {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .venue-content {
    grid-template-columns: 1fr;
  }

  .editions-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .organizers-grid {
    grid-template-columns: 1fr;
  }

  .pc-list {
    columns: 1;
  }

  .date-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .speaker-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .editions-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}