/* =====================================================================
   Portfolio styles — Suhyeon Jun
   Palette: strawberry milk (very pale pink) + neutral ink
   ===================================================================== */

:root {
  /* light theme (default) */
  --bg:            #ffffff;
  --bg-soft:       #fdf4f5;   /* strawberry milk tint, used on section accents */
  --bg-card:       #ffffff;
  --ink:           #1f1f1f;
  --ink-muted:     #6b6b6b;
  --ink-soft:      #9a9a9a;
  --border:        #eee2e5;
  --border-strong: #e2d2d6;
  --accent:        #e8a5ae;   /* hover, underline */
  --accent-strong: #d98a95;   /* active nav, badge */
  --topbar-bg:     rgba(255, 255, 255, 0.82);
  --shadow:        0 1px 0 rgba(0, 0, 0, 0.04);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-ko: 'Gowun Batang', 'Source Serif 4', serif;

  --max-w: 880px;
  --topbar-h: 56px;
}

html[data-theme='dark'] {
  --bg:            #141416;
  --bg-soft:       #1c1719;   /* very dim strawberry tint on dark */
  --bg-card:       #1a1a1c;
  --ink:           #ececec;
  --ink-muted:     #a8a8a8;
  --ink-soft:      #7a7a7a;
  --border:        #2c2628;
  --border-strong: #3a3033;
  --accent:        #e8a5ae;
  --accent-strong: #f0b9c2;
  --topbar-bg:     rgba(20, 20, 22, 0.82);
  --shadow:        0 1px 0 rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

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

/* =================== Topbar =================== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--topbar-bg);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  height: var(--topbar-h);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar-brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
  border-bottom: none;
  letter-spacing: 0.01em;
}

.topbar-brand:hover { color: var(--accent-strong); }

.topbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.topbar-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-muted);
  border-bottom: none;
  border-radius: 6px;
}

.topbar-nav a:hover {
  color: var(--accent-strong);
  background: var(--bg-soft);
}

.topbar-nav a.is-active {
  color: var(--accent-strong);
  background: var(--bg-soft);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-left: 4px;
  padding: 0;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--ink-muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  color: var(--accent-strong);
  background: var(--bg-soft);
  border-color: var(--border);
}

.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: inline-block; }

html[data-theme='dark'] .theme-toggle .icon-sun { display: none; }
html[data-theme='dark'] .theme-toggle .icon-moon { display: inline-block; }

/* =================== Page / Sections =================== */

.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}

.section:last-of-type { border-bottom: none; }

.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  margin: 0 0 28px;
  color: var(--ink);
  position: relative;
  padding-left: 14px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.45em;
  bottom: 0.3em;
  width: 4px;
  background: var(--accent);
  border-radius: 2px;
}

.section-body { color: var(--ink); }

/* =================== Hero =================== */

.section-hero {
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 36px;
  align-items: center;
}

.hero-photo img {
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--bg-soft);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
}

.hero-name {
  font-family: var(--font-serif);
  font-size: 2.1rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink);
  line-height: 1.15;
}

.hero-name-ko {
  font-family: var(--font-ko);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--ink-muted);
  margin-left: 10px;
  letter-spacing: 0.01em;
}

.hero-line {
  margin: 2px 0;
  color: var(--ink-muted);
  font-size: 0.98rem;
}

.hero-advisor { margin-top: 6px; }
.hero-advisor a { font-weight: 500; }

.hero-links {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.hero-links a:hover {
  color: var(--accent-strong);
  border-color: var(--accent);
  background: var(--bg-soft);
}

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

.bio {
  margin: 0 0 28px;
}

.bio p {
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--ink);
  margin: 0 0 14px;
}

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

.bio strong {
  color: var(--ink);
  font-weight: 600;
  background: linear-gradient(180deg, transparent 60%, var(--bg-soft) 60%);
  padding: 0 2px;
}

.subhead {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.interests-headline {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-strong);
  margin: 0 0 6px;
  letter-spacing: 0.005em;
}

.interests-desc {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}

.interests-desc strong {
  font-weight: 600;
  color: var(--ink);
}

.tag-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 5px 12px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
}

/* =================== Timeline =================== */

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline-year-block {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 28px;
  padding: 18px 0;
  border-top: 1px dashed var(--border);
}

.timeline-year-block:first-child { border-top: none; padding-top: 0; }

.timeline-year {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent-strong);
  letter-spacing: 0.01em;
}

.timeline-events {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline-event {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 8px 0 14px;
}

.timeline-event + .timeline-event { border-top: 1px dotted var(--border); padding-top: 14px; }

.timeline-date {
  font-size: 0.86rem;
  color: var(--ink-soft);
  padding-top: 2px;
  font-variant-numeric: tabular-nums;
}

.timeline-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.timeline-where {
  font-size: 0.94rem;
  color: var(--ink-muted);
  margin-bottom: 4px;
}

.timeline-detail {
  font-size: 0.9rem;
  color: var(--ink-muted);
  line-height: 1.55;
}

.badge {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-strong);
  background: var(--bg-soft);
  border: 1px solid var(--accent);
  border-radius: 999px;
  vertical-align: 2px;
}

/* =================== Experience =================== */

/* Sub-section spacing inside Experience */
#experience .subhead {
  margin-top: 36px;
  margin-bottom: 14px;
}

#experience .subhead:first-of-type { margin-top: 0; }

.exp-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.exp-item {
  padding: 18px 0;
  border-top: 1px dashed var(--border);
}

.exp-item:first-child { border-top: none; padding-top: 0; }

.exp-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 8px;
}

.exp-head-left { min-width: 0; }

.exp-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
}

.exp-team {
  font-weight: 400;
  color: var(--ink-muted);
}

.exp-org {
  font-size: 0.94rem;
  color: var(--ink-muted);
  margin-top: 2px;
}

.exp-org a {
  color: var(--ink-muted);
  border-bottom-color: var(--border-strong);
}

.exp-org a:hover {
  color: var(--accent-strong);
  border-bottom-color: var(--accent);
}

.exp-location { color: var(--ink-soft); }

.exp-period {
  flex-shrink: 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
  text-align: right;
}

.exp-desc {
  margin: 6px 0 10px;
  font-size: 0.94rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

.exp-points {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}

.exp-points li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
  font-size: 0.92rem;
  color: var(--ink);
  line-height: 1.6;
}

.exp-points li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.cred-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.cred-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  border-top: 1px dotted var(--border);
}

.cred-item:first-child { border-top: none; padding-top: 0; }

.cred-name {
  font-size: 0.95rem;
  color: var(--ink);
}

.cred-date {
  flex-shrink: 0;
  font-size: 0.84rem;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

/* =================== Footer =================== */

.page-footer {
  border-top: 1px solid var(--border);
  margin-top: 32px;
  padding: 24px 0 40px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.footer-dot { margin: 0 8px; color: var(--border-strong); }

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

@media (max-width: 720px) {
  .topbar-inner { padding: 0 16px; }
  .topbar-nav a span { display: none; }
  .topbar-nav a { padding: 6px 10px; }

  .page { padding: 0 16px; }

  .section { padding: 40px 0; }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    text-align: center;
  }

  .hero-photo {
    justify-self: center;
  }

  .hero-photo img {
    width: 140px;
    height: 140px;
  }

  .hero-name { font-size: 1.7rem; }
  .hero-name-ko { display: block; margin-left: 0; margin-top: 4px; }

  .hero-links { justify-content: center; }

  .timeline-year-block {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .timeline-event {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .timeline-date {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-strong);
    font-weight: 600;
  }

  .exp-head {
    flex-direction: column;
    gap: 4px;
  }

  .exp-period { text-align: left; padding-top: 0; }

  .cred-item {
    flex-direction: column;
    gap: 2px;
    align-items: flex-start;
  }
}