:root {
  --bg: #ffffff;
  --text: #111111;
  --text-secondary: #333333;
  --text-muted: #666666;
  --border: #e6e6e6;
  --border-light: #f0f0f0;
  --accent: #ff8800;
  --accent-hover: #e07600;
  --accent-soft: rgba(255, 136, 0, 0.1);
  --font-main: 'Lato', Verdana, Helvetica, sans-serif;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

/* ================= HERO / BIO ================= */
.hero {
  padding-bottom: 36px;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 215px 1fr;
  gap: 36px;
  align-items: center;
}

.hero-avatar-wrap {
  width: 215px;
  height: 215px;
  border-radius: 50%;
  overflow: hidden;
  background: #ffffff;
  flex-shrink: 0;
}

.hero-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-name {
  font-family: var(--font-main);
  font-size: 34px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 12px;
}

.hero-bio {
  font-family: var(--font-main);
  font-size: 16.5px;
  font-weight: 400;
  color: var(--text-secondary);
  line-height: 1.62;
  margin-bottom: 18px;
}

.hero-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  color: var(--accent);
  background: transparent;
  border: none;
  transition: transform 0.15s ease, color 0.15s ease, opacity 0.15s ease;
  text-decoration: none !important;
}

.icon-link:hover {
  color: var(--accent-hover);
  transform: translateY(-1px) scale(1.06);
}

.icon-link .icon {
  width: 27px;
  height: 27px;
}

.icon-link .icon-img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  display: block;
}

/* ================= SECTIONS ================= */
.section {
  padding-top: 36px;
}

.section + .section {
  margin-top: 36px;
  border-top: 1px solid var(--border);
}

.section-title {
  font-family: var(--font-main);
  font-size: 23px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 22px;
}

/* ================= TIMELINE (KARPATHY-STYLE) ================= */
.timeline {
  display: flex;
  flex-direction: column;
}

.tl-item {
  display: grid;
  grid-template-columns: 152px 60px 1fr;
  gap: 0 14px;
  position: relative;
}

.tl-time {
  text-align: right;
  padding-top: 12px;
}

.tl-date {
  font-family: var(--font-main);
  font-size: 13.5px;
  font-weight: 400;
  color: var(--text-muted);
  white-space: nowrap;
}

.tl-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tl-logo {
  width: 52px;
  height: 48px;
  background: #ffffff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 2;
  padding: 2px;
  overflow: hidden;
}

.tl-logo-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.tl-line {
  width: 2px;
  background: var(--border);
  flex-grow: 1;
  margin: 4px 0;
}

.tl-body {
  padding-top: 4px;
  padding-bottom: 34px;
  min-width: 0;
}

.tl-item:last-child .tl-body {
  padding-bottom: 8px;
}

.tl-header {
  margin-bottom: 6px;
}

.tl-role {
  font-size: 17.5px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.tl-role em {
  font-weight: 400;
  font-style: italic;
}

.tl-org {
  font-size: 14.5px;
  font-weight: 400;
  color: var(--accent);
  margin-top: 1px;
}

.tl-desc {
  font-size: 15.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.tl-desc + .tl-desc {
  margin-top: 8px;
}

/* Embedded Projects inside Timeline */
.tl-projects {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-card {
  display: grid;
  grid-template-columns: 128px 1fr;
  gap: 14px;
  padding: 10px;
  border-radius: 8px;
  background: #ffffff;
  border: 1px solid var(--border);
  align-items: center;
  transition: border-color 0.15s ease;
}

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

.project-thumb-wrap {
  width: 128px;
  height: 82px;
  border-radius: 5px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--border-light);
  cursor: zoom-in;
  flex-shrink: 0;
}

.project-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.project-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 3px;
  line-height: 1.35;
}

.project-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 5px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.project-links a {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent);
}

/* ================= TEACHING & SPEAKING + VIDEOS ================= */
.teaching-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 18px;
}

.teach-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
}

.teach-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.35;
}

.teach-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.videos-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.video-card {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none !important;
  color: inherit;
  transition: border-color 0.15s ease;
}

.video-card:hover {
  border-color: var(--accent);
}

.video-thumb-wrap {
  position: relative;
  width: 100%;
  height: 210px;
  background: #000;
  overflow: hidden;
}

.video-thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.video-play-Btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.video-body {
  padding: 14px 18px 16px;
}

.video-title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.35;
}

.video-card:hover .video-title {
  color: var(--accent);
}

.video-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ================= HOBBIES & CAROUSEL ================= */
.hobbies-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.hobby-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.carousel {
  position: relative;
  width: 100%;
  height: 290px;
  background: #fafafa;
  border-bottom: 1px solid var(--border-light);
  overflow: hidden;
  user-select: none;
}

.carousel-track {
  width: 100%;
  height: 100%;
  position: relative;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  cursor: zoom-in;
}

.carousel-slide.active {
  opacity: 1;
  pointer-events: auto;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.88);
  color: #111111;
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 5;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.18);
  transition: background 0.15s ease, color 0.15s ease;
}

.carousel-btn:hover {
  background: var(--accent);
  color: #ffffff;
}

.carousel-btn.prev {
  left: 10px;
}

.carousel-btn.next {
  right: 10px;
}

.carousel-dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 5;
  background: rgba(0, 0, 0, 0.3);
  padding: 4px 8px;
  border-radius: 12px;
}

.carousel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  padding: 0;
  transition: background 0.15s ease, transform 0.15s ease;
}

.carousel-dot.active {
  background: var(--accent);
  transform: scale(1.2);
}

.hobby-body {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.hobby-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.hobby-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* ================= LIGHTBOX ================= */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.lightbox.open {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-img {
  max-width: min(960px, 92vw);
  max-height: 80vh;
  border-radius: 6px;
  object-fit: contain;
  background: #ffffff;
}

.lightbox-caption {
  margin-top: 12px;
  color: #f0f0f0;
  font-size: 14px;
  text-align: center;
  max-width: 680px;
}

.lightbox-close {
  position: absolute;
  top: 18px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
}

.lightbox-close:hover {
  background: var(--accent);
}

/* ================= RESPONSIVE ================= */
@media (max-width: 760px) {
  .container {
    padding: 32px 18px 60px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 18px;
  }

  .hero-avatar-wrap {
    margin: 0 auto;
    width: 175px;
    height: 175px;
  }

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

  .tl-item {
    grid-template-columns: 48px 1fr;
    gap: 0 12px;
  }

  .tl-time {
    grid-column: 2;
    text-align: left;
    padding-top: 0;
    margin-bottom: 2px;
  }

  .tl-marker {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .tl-logo {
    width: 44px;
    height: 44px;
  }

  .tl-body {
    grid-column: 2;
    padding-top: 0;
  }

  .project-card {
    grid-template-columns: 1fr;
  }

  .project-thumb-wrap {
    width: 100%;
    height: 150px;
  }

  .teaching-grid,
  .videos-grid,
  .hobbies-grid {
    grid-template-columns: 1fr;
  }
}