:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #111111;
  --text-muted: #6b6b6b;
  --accent: #7a9a8b;
  --accent-soft: #eef2f0;
  --border: #e6e6e3;

  --font-heading: "Newsreader", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 500;
  letter-spacing: 0.01em;
}

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

a:hover {
  text-decoration: underline;
}

/* Header + tabs */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: saturate(180%) blur(6px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 32px 0;
}

.site-name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.2rem;
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  flex: 0 0 auto;
  background: none;
  border: none;
  font: inherit;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  padding: 10px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-btn:hover {
  color: var(--text);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 500;
}

/* Content */
.content {
  max-width: 780px;
  margin: 0 auto;
  padding: 64px 32px 80px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

h2 {
  font-size: 1.5rem;
  margin: 0 0 32px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* Home */
.home-grid {
  display: flex;
  gap: 40px;
  align-items: stretch;
  flex-wrap: wrap;
}

.photo-col {
  flex: 0 0 auto;
  width: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}

.photo-placeholder {
  flex: 0 0 auto;
  width: 240px;
  height: 300px;
  border-radius: 6px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  overflow: hidden;
}

.photo-caption {
  margin: 0;
  font-size: 0.82rem;
  font-style: italic;
  color: var(--text-muted);
  line-height: 1.55;
}

.photo-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.home-text {
  flex: 1 1 320px;
  min-width: 280px;
}

.home-text h1 {
  margin: 0 0 10px;
  font-size: 2.4rem;
}

.chinese-name {
  font-family: "Noto Serif SC", "Songti SC", "STSong", serif;
  font-weight: 400;
  color: #5f7267;
  font-size: 1.9rem;
  margin-left: 8px;
}

.tagline {
  margin: 0 0 24px;
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.5;
}

.intent-callout {
  background: var(--accent-soft);
  border-left: 2px solid var(--accent);
  padding: 18px 20px;
  border-radius: 4px;
  margin-bottom: 28px;
}

.intent-callout p {
  margin: 0;
  font-size: 0.96rem;
  color: var(--text);
}

.contact-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.contact-row li {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
}

.icon {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

/* Entries (education, research, work, projects) */
.entry {
  margin-bottom: 36px;
}

.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
}

.entry-title {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.15rem;
}

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

.entry-sub {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px;
  font-style: italic;
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 4px;
}

.bullets {
  margin: 14px 0 0;
  padding-left: 20px;
}

.bullets li {
  margin-bottom: 8px;
  font-size: 0.94rem;
  color: var(--text);
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.skill-group h3 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.84rem;
}

/* Vault modal */
.vault-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(17, 17, 17, 0.55);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.vault-modal.active {
  display: flex;
}

.vault-box {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px;
  width: 90%;
  max-width: 420px;
}

.vault-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
}

.vault-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 0 0 6px;
}

.vault-cipher {
  font-family: monospace;
  font-size: 0.8rem;
  word-break: break-all;
  background: var(--accent-soft);
  padding: 10px 12px;
  border-radius: 4px;
  margin: 0 0 20px;
  color: var(--text);
}

.vault-input {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  margin-bottom: 12px;
}

.vault-btn {
  font: inherit;
  font-size: 0.9rem;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
}

.vault-btn:hover {
  background: var(--accent);
  color: var(--surface);
}

.vault-result {
  font-family: monospace;
  font-size: 0.85rem;
  word-break: break-all;
  color: var(--text);
  margin: 16px 0 0;
  min-height: 1.2em;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 32px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* Mobile */
@media (max-width: 600px) {
  .home-grid {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .contact-row {
    justify-content: center;
  }

  .entry-head,
  .entry-sub {
    flex-direction: column;
    gap: 2px;
  }

  .content {
    padding: 40px 20px 60px;
  }

  .home-text h1 {
    font-size: 2rem;
  }
}