/* ══════════════════════════════════════════════════════════
   Home page — editorial monochrome with a cobalt accent.
   Standalone: not loaded together with main.css.
   ══════════════════════════════════════════════════════════ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --text-primary: #000000;
  --text-secondary: #4b5563;
  --text-tertiary: #9ca3af;
  --border: #e5e7eb;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;

  --muted-bg: #f9fafb;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --surface: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-tertiary: #4b5563;
    --border: #1f2937;

    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-light: #172554;

    --muted-bg: #111827;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, .section-title, .vertical-nav a, .pub-venue, .badge, .news-date {
  font-family: 'Space Grotesk', sans-serif;
}

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

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

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

/* ── Layout ── */
.app-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 80px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 24px;
}

/* ── Sidebar ── */
.sidebar {
  position: sticky;
  top: 100px;
  height: calc(100vh - 200px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sidebar-top {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 12px;
  object-fit: cover;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.avatar:hover {
  transform: scale(1.03);
}

.sidebar h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.sidebar h1 .name-cn {
  display: block;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--text-tertiary);
  margin-top: 6px;
}

.sidebar-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 10px;
}

.sidebar-meta a {
  font-weight: 600;
}

.sidebar-email {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--muted-bg);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 20px;
  margin-top: 16px;
}

.status-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%   { transform: scale(0.9); opacity: 0.6; box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
  70%  { transform: scale(1.2); opacity: 1;   box-shadow: 0 0 0 6px rgba(37, 99, 235, 0); }
  100% { transform: scale(0.9); opacity: 0.6; box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .status-dot { animation: none; }
}

.vertical-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 40px 0;
}

.vertical-nav a {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  transition: var(--transition);
  padding-left: 0;
}

.vertical-nav a:hover,
.vertical-nav a.active {
  color: var(--accent);
  padding-left: 12px;
  border-left: 2px solid var(--accent);
}

.sidebar-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
  font-weight: 500;
}

.sidebar-footer a {
  color: var(--text-secondary);
}

.sidebar-footer a:hover {
  color: var(--accent);
}

/* ── Main content ── */
.content {
  max-width: 680px;
}

section {
  padding-top: 40px;
  margin-bottom: 80px;
}

section:first-of-type {
  padding-top: 0;
}

.section-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-primary);
  margin-bottom: 28px;
  border-bottom: 1px solid var(--text-primary);
  padding-bottom: 8px;
}

.about-text {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.about-text p + p {
  margin-top: 14px;
}

.about-text a {
  font-weight: 600;
}

.section-note {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

/* ── Scroll containers ── */
.scroll-container {
  overflow-y: auto;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.scroll-container::-webkit-scrollbar { width: 4px; }
.scroll-container::-webkit-scrollbar-track { background: transparent; }
.scroll-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.scroll-container::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── Publications ── */
.pub-scroll-container {
  max-height: 520px;
  padding: 4px 16px 4px 0;
}

.pub-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

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

.pub-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--text-primary);
}

.pub-title a { color: var(--text-primary); }
.pub-title a:hover { color: var(--accent); }

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.pub-authors b {
  font-weight: 700;
  color: var(--text-primary);
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.pub-venue {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.badge-highlight {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

.badge-link {
  background: var(--muted-bg);
  color: var(--text-primary);
  border-color: var(--border);
}

.badge-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Timeline (experiences & education) ── */
.timeline-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

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

.timeline-when {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-top: 2px;
}

.timeline-logo {
  height: 26px;
  max-width: 96px;
  object-fit: contain;
  object-position: left center;
  margin-top: 10px;
  display: block;
  opacity: 0.85;
}

/* Square marks carry far less visual mass than a wordmark of the same height,
   so they get a taller box; wide wordmarks get a shorter, narrower one. */
.timeline-logo--mark {
  height: 32px;
  max-width: 32px;
}

.timeline-logo--wide {
  height: 18px;
  max-width: 78px;
}

.timeline-body h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3px;
}

.timeline-where {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.timeline-body p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.timeline-body a {
  font-weight: 600;
}

/* ── News ── */
.news-scroll-container {
  max-height: 320px;
  padding: 4px 16px 4px 0;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border);
  align-items: baseline;
}

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

.news-date {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.news-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ── Services ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.services-card h3 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.services-list {
  list-style: none;
}

.services-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  line-height: 1.4;
}

.services-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}

/* ── Hobbies ── */
.hobbies-text {
  font-size: 0.92rem;
  line-height: 1.7;
}

.hobbies-text p + p {
  margin-top: 12px;
}

.hobbies-text strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* ── Footer with epigraph ── */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 56px 24px 48px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  text-align: center;
}

.epigraph {
  max-width: 460px;
  border-left: 2px solid var(--accent);
  padding-left: 20px;
  text-align: left;
}

.epigraph p {
  font-style: italic;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.epigraph .stelle {
  color: var(--accent);
  font-weight: 600;
}

.epigraph cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
}

.footer-text {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .app-container {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 56px 24px;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .vertical-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 18px;
    margin: 28px 0;
  }

  .vertical-nav a:hover,
  .vertical-nav a.active {
    padding-left: 0;
    border-left: none;
    border-bottom: 2px solid var(--accent);
  }

  .content {
    max-width: none;
  }

  section {
    padding-top: 24px;
    margin-bottom: 56px;
  }
}

@media (max-width: 560px) {
  .timeline-item,
  .news-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .timeline-logo {
    margin-top: 4px;
  }
}