/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary:   #f5c518;
  --color-secondary: #1a1a2e;
  --color-accent:    #40cd8b;
  --color-bg:        #0d0d1a;
  --color-surface:   #16213e;
  --color-text:      #e0e0e0;
  --color-text-muted:#a0a0b0;
  --color-border:    #2a2a4a;
  --color-primary-dim: rgba(245, 197, 24, 0.15);
  --color-accent-dim:  rgba(0, 180, 216, 0.15);
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  --max-width: 1200px;
  --nav-height: 60px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* ===== Navigation ===== */
.nav {
  background: var(--color-secondary);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  height: 100%;
  gap: 2rem;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  margin-left: auto;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 1rem;
  color: var(--color-text-muted);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

.nav-lang {
  display: flex;
  gap: 0.25rem;
  margin-left: 1rem;
  padding-left: 1rem;
  border-left: 1px solid var(--color-border);
}

.lang-btn {
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  border-radius: 4px;
  letter-spacing: 0.5px;
  transition: all 0.2s;
}

.lang-btn:hover,
.lang-btn.active {
  color: var(--color-bg);
  background: var(--color-primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: all 0.3s;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  left: 0;
  transition: all 0.3s;
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

/* ===== Main Content ===== */
.main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

.page {
  max-width: 800px;
  margin: 0 auto;
}

/* ===== Bio Page ===== */
.bio-header {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-bottom: 3rem;
}

.bio-avatar {
  flex-shrink: 0;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid var(--color-primary);
  background: var(--color-surface);
}

.bio-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bio-info h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.bio-headline {
  color: var(--color-accent);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.bio-nickname {
  display: inline-block;
  color: var(--color-primary);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.bio-company {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.bio-summary {
  color: var(--color-text-muted);
  font-size: 1rem;
  max-width: 600px;
}

.bio-section {
  margin-bottom: 2.5rem;
}

.bio-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.highlight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s;
}

.highlight-card:hover {
  border-color: var(--color-primary);
}

.highlight-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 0.75rem;
  color: var(--color-accent);
}

.highlight-icon svg {
  width: 100%;
  height: 100%;
}

.highlight-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.highlight-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.skill-category h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ===== Timeline (Education & Experience) ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.timeline-icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.timeline-icon svg {
  width: 100%;
  height: 100%;
}

.timeline-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s;
}

.timeline-content:hover {
  border-color: var(--color-primary);
}

.timeline-header {
  margin-bottom: 0.75rem;
}

.timeline-year {
  display: inline-block;
  background: var(--color-primary-dim);
  color: var(--color-primary);
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-company {
  display: inline-block;
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 500;
}

.timeline-company:hover {
  color: var(--color-primary);
}

.timeline-body {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.timeline-detail {
  margin-bottom: 0.5rem;
}

.timeline-detail strong {
  color: var(--color-text);
  font-weight: 500;
}

.timeline-description {
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-left: 0.5rem;
}

.badge-remote {
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.achievements-section,
.technologies-section {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

.achievements-section h4,
.technologies-section h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.achievements-section ul {
  list-style: none;
  padding: 0;
}

.achievements-section li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.35rem;
  color: var(--color-text-muted);
}

.achievements-section li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tech-tag {
  background: var(--color-primary-dim);
  color: var(--color-primary);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* ===== 404 Page ===== */
.page-404 {
  text-align: center;
  padding: 4rem 0;
}

.page-404 h1 {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.page-404 p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.page-404 a {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-bg);
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: opacity 0.2s;
}

.page-404 a:hover {
  opacity: 0.85;
  color: var(--color-bg);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-secondary);
  border-top: 1px solid var(--color-border);
  padding: 1.5rem;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.social-links {
  display: flex;
  gap: 1rem;
}

.social-links a {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.icon {
  width: 20px;
  height: 20px;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .media-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-toggle {
    display: block;
    order: 3;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-secondary);
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-link {
    width: 100%;
    text-align: center;
    padding: 0.75rem;
  }

  .nav-lang {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--color-border);
    padding-top: 0.75rem;
    width: 100%;
    justify-content: center;
  }

  .bio-header {
    flex-direction: column;
    text-align: center;
  }

  .bio-avatar {
    width: 120px;
    height: 120px;
  }

  .bio-info h1 {
    font-size: 1.5rem;
  }

  .bio-summary {
    max-width: 100%;
  }

  .highlights-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .main {
    padding: 1.5rem 1rem;
  }

  .bio-avatar {
    width: 100px;
    height: 100px;
  }

  .page-404 h1 {
    font-size: 3rem;
  }

  .media-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Media Page ===== */
.media-page {
  max-width: 1200px;
  margin: 0 auto;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.media-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}

.media-card:hover {
  border-color: var(--color-primary);
}

.media-card img,
.video-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  cursor: pointer;
}

.video-placeholder {
  position: relative;
  background: var(--color-bg);
}

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

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  background: rgba(245, 197, 24, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s, background 0.2s;
}

.play-button svg {
  width: 24px;
  height: 24px;
  color: var(--color-bg);
  margin-left: 3px;
}

.media-card:hover .play-button {
  transform: translate(-50%, -50%) scale(1.1);
  background: var(--color-primary);
}

.media-card-body {
  padding: 1rem;
}

.media-card-body h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.media-card-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.6rem;
}

.media-tag {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
}

.media-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.media-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.media-links a:hover {
  color: var(--color-primary);
}

.media-links .icon {
  width: 14px;
  height: 14px;
}

/* Video Lightbox */
.video-lightbox,
.image-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.video-lightbox.active,
.image-lightbox.active {
  display: flex;
}

.video-lightbox-content,
.image-lightbox-content {
  position: relative;
  width: 90%;
  max-width: 900px;
}

.video-lightbox-iframe {
  aspect-ratio: 16 / 9;
  width: 100%;
}

.video-lightbox-iframe iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.image-lightbox-content img {
  max-width: 100%;
  max-height: 85vh;
  border-radius: var(--radius);
}

.video-lightbox-close,
.image-lightbox-close {
  position: absolute;
  top: -12px;
  right: -12px;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-bg);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 201;
  transition: opacity 0.2s;
}

.video-lightbox-close:hover,
.image-lightbox-close:hover {
  opacity: 0.85;
}

/* ===== Placeholder Pages ===== */
.page-placeholder {
  text-align: center;
  padding: 4rem 0;
}

.page-placeholder h1 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.placeholder-msg {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* ===== Articles Page ===== */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 2rem;
}

/* Part (section) wrapper */
.article-part {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}

.article-part:hover {
  border-color: var(--color-primary-dim);
}

/* Part header (button for both single and multi articles) */
.part-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: none;
  cursor: pointer;
  text-align: left;
  color: inherit;
  font: inherit;
  text-decoration: none;
  transition: background 0.2s;
}

.part-header:hover {
  background: var(--color-primary-dim);
}

.part-header[href] {
  cursor: pointer;
}



.part-heading {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.part-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.part-description {
  font-size: 0.85rem;
  line-height: 1.45;
  color: var(--color-text-muted);
  font-weight: 400;
}

.part-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.part-chevron {
  color: var(--color-text-muted);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.article-part.open .part-chevron {
  transform: rotate(180deg);
}

/* Part articles container */
.part-articles {
  padding: 0.75rem 1.25rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.article-part.open .part-articles {
  max-height: 4000px;
  padding: 0.75rem 1.25rem 1rem;
}

/* Article items list */
.article-items {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-item {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

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

.article-item .article-date {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  white-space: nowrap;
  flex-shrink: 0;
}

.article-body {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  flex: 1;
  min-width: 0;
}

.article-item .article-link {
  color: var(--color-text);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.2s;
}

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

.article-summary {
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--color-text-muted);
}

/* Empty state */
.part-articles-empty {
  padding: 0.5rem 0;
}

.empty-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  opacity: 0.7;
}

@media (max-width: 480px) {
  .part-header {
    padding: 0.85rem 1rem;
    gap: 0.5rem;
  }

  .part-date {
    display: none;
  }

  .part-articles,
  .article-part.open .part-articles {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}