/* ========================================
   Wilson Tang — Personal Site
   Minimal, text-focused layout
   ======================================== */

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

:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-secondary: #666666;
  --color-accent: #0969da;
  --color-border: #d1d5db;
  --color-surface: #f6f8fa;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 620px;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background-color: var(--color-accent);
  color: #fff;
}

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

a:hover {
  text-decoration: underline;
}

/* ========================================
   CONTAINER
   ======================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px 40px;
}

/* ========================================
   HEADER
   ======================================== */
header {
  margin-bottom: 32px;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.tagline {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 12px;
}

.social-links {
  display: flex;
  gap: 16px;
  font-size: 0.9rem;
}

.social-links a {
  color: var(--color-text-secondary);
}

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

/* ========================================
   TAB NAVIGATION
   ======================================== */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 8px 16px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

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

.tab.active {
  color: var(--color-text);
  border-bottom-color: var(--color-text);
}

/* ========================================
   TAB CONTENT
   ======================================== */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-content p {
  margin-bottom: 12px;
  color: var(--color-text);
}

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

/* ========================================
   HOME — DETAIL ROWS
   ======================================== */
.detail-row {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem;
  margin-top: 4px;
}

.detail-row:first-of-type {
  margin-top: 20px;
}

.label {
  color: var(--color-text-secondary);
  min-width: 90px;
  flex-shrink: 0;
}

.updated {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 20px;
  font-style: italic;
}

/* ========================================
   ABOUT — ENTRIES (Experience, Education, Awards)
   ======================================== */
.tab-content h2 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-top: 32px;
  margin-bottom: 16px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

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

.entry {
  margin-bottom: 20px;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.entry-date {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.entry-org {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

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

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

/* ========================================
   FLIGHTS — FLIGHTY & PHOTOS
   ======================================== */
.flight-map {
  margin-bottom: 32px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.flight-map iframe {
  width: 100%;
  height: 500px;
  border: none;
  display: block;
}

.flighty-stats {
  margin-bottom: 32px;
}

.flighty-stats img {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.photo-grid figure {
  margin: 0;
}

.photo-grid img {
  width: 100%;
  border-radius: 6px;
  object-fit: cover;
  aspect-ratio: 3/4;
}

.photo-grid figcaption {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 6px;
}

/* ========================================
   FOOTER
   ======================================== */
footer {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 480px) {
  .container {
    padding: 40px 16px 32px;
  }

  header h1 {
    font-size: 1.3rem;
  }

  .tab {
    padding: 8px 12px;
    font-size: 0.85rem;
  }

  .detail-row {
    flex-direction: column;
    gap: 2px;
  }

  .entry-header {
    flex-direction: column;
    gap: 2px;
  }

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