:root {
  --bg: #0f1419;
  --bg-alt: #151c25;
  --surface: #1a2332;
  --border: #2d3748;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #34d399;
  --accent-dim: #059669;
  --radius: 0;
  --font: "Fira Code", "JetBrains Mono", "Cascadia Code", "SF Mono", "Monaco", "Menlo", monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
header {
  margin-bottom: 3rem;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  flex-wrap: wrap;
}

.header-info h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--accent);
  margin-top: 0.25rem;
}

/* Language switcher */
.lang-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.lang-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 0.15rem 0.3rem;
  transition: color 0.15s;
}

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

.lang-btn.active {
  color: var(--accent);
  font-weight: 600;
}

.lang-sep {
  color: var(--border);
  font-size: 0.75rem;
}

/* Tab bar */
.tab-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  overflow-x: auto;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.6rem 1rem;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

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

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

/* Sections */
.section {
  margin-bottom: 2.5rem;
}

.section-body {
  padding-left: 1.5rem;
  border-left: 2px solid var(--border);
}

.section-body p {
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

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

/* Lists */
ul {
  list-style: none;
}

li {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
}

li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

li:last-child {
  margin-bottom: 0;
}

/* Projects */
.sub-section-label {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sub-section-label:first-of-type {
  margin-top: 0;
}

.project-list li {
  padding-left: 1.25rem;
}

.project-link {
  color: inherit;
  text-decoration: none;
  display: block;
  padding: 0.15rem 0;
  transition: color 0.15s;
}

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

.project-name {
  display: block;
  color: var(--text);
  font-weight: 500;
}

.project-desc {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.subpage-title {
  font-size: 1rem;
  color: var(--accent);
  margin-top: 1rem;
}

.subpage-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

/* Academic */
.academic-list li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 1.25rem;
}

.uni-name {
  color: var(--text);
  font-weight: 500;
}

.uni-detail {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Hobbies */
.hobby-list li {
  padding-left: 1.25rem;
}

.hobby-link {
  color: var(--text);
  text-decoration: none;
  display: block;
  padding: 0.15rem 0;
  transition: color 0.15s;
}

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

.back-link {
  color: var(--accent-dim);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.15s;
}

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

.hobby-title {
  font-size: 1rem;
  color: var(--accent);
  margin-top: 1rem;
}

/* Contact */
.contact-list li {
  padding-left: 1.25rem;
}

.contact-list a {
  color: var(--accent-dim);
  text-decoration: none;
  transition: color 0.15s;
}

.contact-list a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.contact-label {
  color: var(--text-dim);
}

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

footer p {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem 1rem;
  }

  .header-inner {
    flex-direction: column;
    gap: 1rem;
  }

  .lang-nav {
    align-self: flex-start;
  }

  .tab-bar {
    gap: 0.5rem;
  }

  .tab-btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
  }

  .section-body {
    padding-left: 1rem;
  }
}