/* AI-Debatten Microsite — Editorial newspaper theme */

:root {
  --color-bg: #faf9f6;
  --color-bg-sidebar: #f4f2ee;
  --color-bg-hover: #eceae4;
  --color-bg-active: #e4e1da;
  --color-ink: #1a1a1a;
  --color-ink-secondary: #444;
  --color-ink-muted: #777;
  --color-ink-faint: #aaa;
  --color-rule: #c8c4bc;
  --color-rule-light: #ddd9d2;
  --color-rule-heavy: #1a1a1a;
  --color-accent: #8b2500;
  --color-caution: #9a7b1a;
  --color-link: #8b2500;
  --sidebar-width: 220px;
  --content-width: 700px;
  --radius: 3px;
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 14px;
  --sp-lg: 20px;
  --sp-xl: 32px;
  --sp-2xl: 48px;
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  display: flex;
}

a { color: var(--color-link); text-decoration-color: color-mix(in oklch, var(--color-link), transparent 60%); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--color-link); }

/* ==========================================================================
   Sidebar — narrow table-of-contents
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100dvh;
  background: var(--color-bg-sidebar);
  border-right: 1px solid var(--color-rule);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: var(--sp-lg) var(--sp-md) var(--sp-md);
  border-bottom: 1px solid var(--color-rule);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  text-decoration: none;
  color: var(--color-ink);
}
.logo-link:hover { opacity: 0.75; }

.logo-mark {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

.logo-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.session-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-sm) 0;
}

.nav-label {
  font-family: var(--font-ui);
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  padding: var(--sp-sm) var(--sp-md) var(--sp-xs);
}

.nav-empty {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--color-ink-muted);
  padding: var(--sp-sm) var(--sp-md);
}

.nav-item {
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding: var(--sp-sm) var(--sp-md);
  text-decoration: none;
  color: var(--color-ink-secondary);
  border-left: 2px solid transparent;
  transition: background 0.1s;
}

.nav-item:hover {
  background: var(--color-bg-hover);
}

.nav-item.active {
  border-left-color: var(--color-accent);
  color: var(--color-ink);
  background: var(--color-bg-active);
}

.nav-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.35;
}

.nav-date {
  font-family: var(--font-ui);
  font-size: 10px;
  color: var(--color-ink-faint);
}

/* ==========================================================================
   Main content area
   ========================================================================== */

.content {
  flex: 1;
  height: 100dvh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

.session-frame {
  flex: 1;
  width: 100%;
  border: none;
}

/* ==========================================================================
   Landing page — newspaper front page
   ========================================================================== */

.landing {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--sp-2xl) var(--sp-xl) var(--sp-xl);
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

/* Masthead logo block */
.landing-logo-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-lg);
}

.landing-logo {
  width: 64px;
  height: 64px;
  object-fit: contain;
}

.landing-logo-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--color-ink);
  margin: 0;
}

.landing h1 {
  display: none; /* Title is in the masthead block */
}

.landing-description {
  font-size: 16px;
  color: var(--color-ink-secondary);
  text-align: center;
  line-height: 1.6;
  margin-bottom: var(--sp-xl);
  max-width: 480px;
  font-family: var(--font-ui);
}

.landing-description a {
  color: var(--color-link);
}

.landing-empty {
  color: var(--color-ink-muted);
  font-size: 15px;
  font-family: var(--font-ui);
}

/* --- Article list (replaces session cards) --- */

.article-list {
  width: 100%;
  border-top: 3px double var(--color-rule-heavy);
}

.article-item {
  display: block;
  padding: var(--sp-lg) 0;
  border-bottom: 1px solid var(--color-rule);
  text-decoration: none;
  color: var(--color-ink);
  transition: background 0.1s;
}

.article-item:hover {
  background: color-mix(in oklch, var(--color-bg-hover), transparent 50%);
}

.article-title {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-ink);
  margin-bottom: var(--sp-xs);
}

.article-deck {
  display: block;
  font-size: 15px;
  font-style: italic;
  color: var(--color-ink-secondary);
  line-height: 1.5;
  margin-bottom: var(--sp-sm);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-ink-muted);
}

.article-byline {
  font-weight: 500;
  color: var(--color-ink-secondary);
}

.article-date::before {
  content: '\2014\00a0';
  color: var(--color-ink-faint);
}

/* ==========================================================================
   About page
   ========================================================================== */

.about-page {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--sp-2xl) var(--sp-xl) var(--sp-2xl);
  line-height: 1.8;
}

.about-logo-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-sm);
  margin: 0 auto var(--sp-2xl);
  padding-bottom: var(--sp-xl);
  border-bottom: 1px solid var(--color-rule);
}

.about-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

.about-logo-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--color-ink);
  margin: 0;
}

.about-page h1 {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--sp-lg);
  line-height: 1.25;
}

.about-page h2 {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: var(--sp-2xl);
  margin-bottom: var(--sp-md);
  padding-top: var(--sp-lg);
  border-top: 1px solid var(--color-rule-light);
}

.about-page p {
  margin-bottom: var(--sp-md);
  color: var(--color-ink);
}

.about-page em { color: var(--color-ink-secondary); }
.about-page strong { color: var(--color-ink); }

.about-page ul {
  padding-left: var(--sp-xl);
  margin-bottom: var(--sp-lg);
}

.about-page li {
  margin-bottom: var(--sp-sm);
}

.about-disclaimer {
  margin-top: var(--sp-2xl);
  padding: var(--sp-lg) var(--sp-xl);
  border-top: 1px solid var(--color-caution);
  border-bottom: 1px solid var(--color-caution);
  background: transparent;
}

.about-disclaimer h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
  color: var(--color-caution);
  font-size: 26px;
}

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

/* ==========================================================================
   Sidebar overlay & toggle (mobile)
   ========================================================================== */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 899;
  background: rgba(0, 0, 0, 0.2);
}
.sidebar-overlay.active { display: block; }

.sidebar-toggle {
  display: none;
  position: fixed;
  top: var(--sp-md);
  left: var(--sp-md);
  z-index: 1000;
  background: var(--color-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  color: var(--color-ink);
  padding: var(--sp-sm);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.sidebar-toggle:hover { background: var(--color-bg-sidebar); }

/* ==========================================================================
   Session content (article view)
   ========================================================================== */

.session-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--sp-xl) var(--sp-xl) var(--sp-2xl);
  width: 100%;
}

/* --- Article header --- */

.thread-header {
  padding-bottom: var(--sp-xl);
  border-bottom: 1px solid var(--color-rule);
}

.thread-dateline {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  margin-bottom: var(--sp-sm);
}

.thread-header h1 {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.2;
  margin-bottom: var(--sp-sm);
}

.thread-deck {
  font-size: 19px;
  font-style: italic;
  color: var(--color-ink-secondary);
  line-height: 1.5;
  margin-bottom: var(--sp-lg);
}

/* Byline with small contributor portraits */
.thread-byline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-md);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--color-rule-light);
}

.byline-contributor {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.byline-contributor img {
  width: 28px;
  height: 28px;
  border-radius: 3px;
  object-fit: cover;
}

.byline-placeholder {
  width: 28px;
  height: 28px;
  border-radius: 3px;
  background: var(--color-bg-sidebar);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-ink-muted);
}

.byline-name {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink-secondary);
}

.disclaimer {
  font-family: var(--font-ui);
  font-size: 13px;
  color: var(--color-ink-muted);
  padding: var(--sp-md) var(--sp-lg);
  margin-top: var(--sp-lg);
  line-height: 1.6;
  border-left: 2px solid var(--color-rule);
}

/* ==========================================================================
   Messages — conversation flow
   ========================================================================== */

.message-bubble {
  display: flex;
  gap: var(--sp-md);
  padding: var(--sp-md) 0;
}

.message-bubble + .message-bubble {
  border-top: 1px solid var(--color-rule-light);
  padding-top: var(--sp-lg);
}

.message-avatar {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
}

.message-avatar img {
  width: 32px;
  height: 32px;
  border-radius: 3px;
  object-fit: cover;
}

.avatar-placeholder {
  width: 32px;
  height: 32px;
  border-radius: 3px;
  background: var(--color-bg-sidebar);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-ink-muted);
}

.message-body { flex: 1; min-width: 0; }

.message-header {
  display: flex;
  align-items: baseline;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-xs);
}

.message-author {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 13px;
  color: var(--color-ink);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.message-time {
  font-family: var(--font-ui);
  font-size: 11px;
  color: var(--color-ink-faint);
}

.message-content {
  color: var(--color-ink);
  line-height: 1.75;
  word-break: break-word;
}

.message-content p { margin-bottom: var(--sp-sm); }
.message-content p:last-child { margin-bottom: 0; }

.message-content h1, .message-content h2, .message-content h3,
.message-content h4, .message-content h5, .message-content h6 {
  font-family: var(--font-display);
  color: var(--color-ink);
  margin-top: var(--sp-lg);
  margin-bottom: var(--sp-sm);
  line-height: 1.3;
}
.message-content h1 { font-size: 1.4em; }
.message-content h2 { font-size: 1.25em; }
.message-content h2:first-child { font-size: 1.85em; }
.message-content h3 { font-size: 1.1em; }

.message-content code {
  font-family: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.88em;
  background: var(--color-bg-sidebar);
  padding: 2px 5px;
  border-radius: 2px;
}

.message-content pre {
  background: var(--color-bg-sidebar);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--radius);
  padding: var(--sp-md);
  overflow-x: auto;
  margin: var(--sp-sm) 0;
}

.message-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
  line-height: 1.5;
}

.message-content blockquote {
  border-left: 2px solid var(--color-rule);
  padding-left: var(--sp-md);
  margin: var(--sp-sm) 0;
  color: var(--color-ink-secondary);
  font-style: italic;
}

.message-content ul, .message-content ol {
  padding-left: var(--sp-xl);
  margin: var(--sp-sm) 0;
}

.message-content li { margin-bottom: var(--sp-xs); }

.message-content hr {
  border: none;
  border-top: 1px solid var(--color-rule);
  margin: var(--sp-xl) 0;
}

.message-content table {
  border-collapse: collapse;
  width: 100%;
  margin: var(--sp-sm) 0;
  font-size: 15px;
}

.message-content th, .message-content td {
  border: 1px solid var(--color-rule);
  padding: var(--sp-xs) var(--sp-sm);
  text-align: left;
}

.message-content th {
  background: var(--color-bg-sidebar);
  font-weight: 600;
}

.message-content strong { color: var(--color-ink); }

.message-footer { margin-top: var(--sp-xs); }

.message-model {
  font-family: var(--font-ui);
  font-size: 10px;
  color: var(--color-ink-faint);
}

/* System messages */
.message-bubble.system {
  justify-content: center;
  padding: var(--sp-md) 0;
}

.system-message {
  text-align: center;
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-ink-muted);
  font-style: italic;
  padding: var(--sp-sm) var(--sp-lg);
  max-width: 560px;
}

/* Summary messages */
.message-bubble.summary {
  justify-content: center;
  padding: var(--sp-lg) 0;
}

.summary-message {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--sp-lg) var(--sp-xl);
  border-top: 2px solid var(--color-ink);
  border-bottom: 1px solid var(--color-rule);
  background: transparent;
}

.summary-message .message-content h2:first-child { margin-top: 0; }

/* Moderator messages */
.message-bubble.user .message-author { color: var(--color-accent); }
.message-bubble.user .avatar-placeholder {
  background: color-mix(in oklch, var(--color-accent), transparent 90%);
  color: var(--color-accent);
}

/* ==========================================================================
   Session footer
   ========================================================================== */

.session-footer {
  padding-top: var(--sp-lg);
}

.credit {
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-ink-muted);
  text-align: center;
}

.participants {
  font-family: var(--font-ui);
  font-size: 12px;
  color: var(--color-ink-muted);
  margin-top: var(--sp-md);
  line-height: 1.6;
}

.participants ul { list-style: none; padding: 0; margin: var(--sp-sm) 0 0; }
.participants li { padding: 2px 0; }
.participant-model { opacity: 0.6; }

/* ==========================================================================
   Mobile
   ========================================================================== */

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 900;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
  }

  .sidebar.open ~ .sidebar-toggle { display: none; }

  .sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .content { width: 100%; }

  .landing {
    padding: 72px var(--sp-lg) var(--sp-lg);
  }

  .landing-logo-title { font-size: 22px; }

  .session-content {
    padding: 48px var(--sp-md) var(--sp-md);
  }

  .thread-header h1 { font-size: 26px; }
  .thread-deck { font-size: 16px; }

  .article-title { font-size: 19px; }

  .message-avatar { width: 26px; height: 26px; }
  .message-avatar img { width: 26px; height: 26px; }
  .message-bubble .avatar-placeholder { width: 26px; height: 26px; font-size: 10px; }
  .message-bubble { gap: var(--sp-sm); }
}