:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --text: #000000;
  --muted: #4f4f4f;
  --border: #d9d9d9;
  --tile: #efefef;
  --shadow: rgba(17, 17, 20, 0.06);
}

:root[data-theme="dark"] {
  --bg: #000000;
  --panel: #000000;
  --text: #ffffff;
  --muted: #b8b8b8;
  --border: #2b2b2b;
  --tile: #1a1a1a;
  --shadow: rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
  font-family: inherit;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  font-weight: 400;
  font-size: 14px;
  line-height: 1.5;
  position: relative;
  overflow-x: hidden;
}

h1,
h2,
h3,
.event-title,
.brand {
  font-family: "Montserrat", "Segoe UI", Arial, sans-serif;
  font-weight: 700;
}

.site-header {
  height: 72px;
  padding: 0 22px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 2.2rem;
  letter-spacing: -0.03em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
  margin-right: 18px;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 200ms ease;
}

.main-nav a:hover {
  color: var(--text);
}

.theme-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  position: relative;
  transition: transform 160ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.icon-sun,
.icon-moon {
  position: absolute;
  line-height: 1;
  font-size: 1rem;
  transition: opacity 220ms ease, transform 220ms ease;
}

:root .icon-sun {
  opacity: 0;
  transform: translateY(4px) scale(0.8);
}

:root .icon-moon {
  opacity: 1;
  transform: translateY(0) scale(1);
}

:root[data-theme="dark"] .icon-sun {
  opacity: 1;
  transform: translateY(0) scale(1);
}

:root[data-theme="dark"] .icon-moon {
  opacity: 0;
  transform: translateY(-4px) scale(0.8);
}

main {
  width: min(1200px, 100% - 44px);
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: clamp(34px, 5vw, 90px);
  align-items: start;
  padding: 38px 0 48px;
}

.left-panel {
  position: sticky;
  top: 108px;
}

.portrait-frame {
  width: min(340px, 100%);
  aspect-ratio: 3 / 4;
  margin: 0;
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--tile);
  display: grid;
  place-items: center;
  position: relative;
}

.portrait-placeholder {
  width: 100%;
  height: 100%;
  background: var(--tile);
  display: block;
  object-fit: cover;
}

.portrait-frame figcaption {
  position: absolute;
  inset: auto 0 16px;
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 500;
  background: color-mix(in srgb, var(--panel) 58%, transparent);
  padding: 8px 12px;
  border-top: 1px solid var(--border);
}

.photo-note {
  margin: 10px 0 0;
  font-family: inherit;
  color: var(--muted);
  font-size: 0.9rem;
}

h1 {
  font-size: clamp(2.3rem, 4.8vw, 3.7rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin: 26px 0 12px;
}

.about-text {
  margin: 0;
  max-width: 26ch;
  color: var(--muted);
  font-size: 1em;
  font-weight: 100;
  line-height: 1.35;
}

.social-links {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

.social-link {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  background: var(--panel);
  transition: color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.social-link:hover {
  color: var(--text);
  border-color: var(--text);
  transform: translateY(-1px);
}

.social-link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.right-panel h2,
.timeline-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.85rem, 2.8vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.project-card {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.project-top-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.project-card h3 {
  margin: 0;
  font-size: clamp(1.3rem, 1.9vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.project-card time {
  color: var(--muted);
  font-size: 1rem;
  white-space: nowrap;
}

.project-card p {
  margin: 8px 0 14px;
  color: var(--muted);
  max-width: 55ch;
  font-size: 1rem;
}

.project-card a {
  color: var(--text);
  text-underline-offset: 5px;
  font-size: 1.03rem;
}

.timeline-section {
  border-top: 0;
  padding: 42px 0 64px;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.footer-inner {
  width: min(1200px, 100% - 44px);
  margin: 0 auto;
  padding: 24px 0 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-inner p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.footer-inner .social-links {
  margin-top: 0;
}

.section-intro {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: clamp(1rem, 1.25vw, 1.2rem);
  max-width: 55ch;
}

.milestone-split {
  display: grid;
  gap: 44px;
}

.milestone-main {
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: clamp(20px, 2.8vw, 36px);
  background: transparent;
}

.milestone-main--mirrored .milestone-preview {
  order: 1;
}

.milestone-main--mirrored .milestone-left {
  order: 2;
}

.milestone-main--mirrored .banner-arrow {
  display: inline-block;
  transform: rotate(180deg);
}

.milestone-left h2 {
  margin: 0 0 14px;
  font-size: clamp(1.85rem, 2.8vw, 2.5rem);
  letter-spacing: -0.02em;
}

.milestone-banners {
  display: grid;
  gap: 12px;
}

.milestone-banner {
  border: 0;
  background: color-mix(in srgb, var(--panel) 98%, var(--text) 2%);
  color: var(--text);
  width: 100%;
  min-height: 74px;
  padding: 14px 16px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  text-align: left;
  cursor: pointer;
  font-size: clamp(1.85rem, 2.8vw, 2.5rem);
  line-height: 1.05;
  font-weight: 700;
  letter-spacing: -0.03em;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), box-shadow 220ms ease, opacity 220ms ease;
}

.milestone-banner span:first-child {
  display: block;
}

.milestone-banner .banner-arrow {
  font-family: "Montserrat", "Segoe UI", Arial, sans-serif;
  font-size: 1em;
  line-height: 1;
}

.milestone-banner:hover,
.milestone-banner:focus-visible,
.milestone-banner.is-active {
  transform: translateY(-6px);
  box-shadow: 0 10px 20px var(--shadow);
}

.milestone-preview {
  display: grid;
  align-content: start;
  gap: 12px;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 260ms ease, transform 260ms ease;
}

.milestone-main.is-in-view .milestone-preview.has-selection {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.milestone-preview.is-fading {
  opacity: 0;
}

.preview-description {
  margin: 0;
  color: var(--muted);
  min-height: 64px;
  font-size: 0.98rem;
  transition: opacity 200ms ease, transform 200ms ease;
}

.preview-frame {
  margin: 0;
  border: 0;
  background: color-mix(in srgb, var(--panel) 92%, var(--text) 8%);
  aspect-ratio: 4 / 3;
  overflow: hidden;
  position: relative;
}

.preview-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 320ms ease, transform 320ms ease;
}

.preview-image--current {
  opacity: 1;
  z-index: 1;
}

.preview-image--next {
  opacity: 0;
  z-index: 0;
}

.milestone-preview.is-fading .preview-image {
  opacity: 0;
  transform: scale(1.02) translateX(8px);
}

.milestone-preview.is-entering .preview-image {
  opacity: 0;
  transform: scale(0.985) translateX(-8px);
}

.milestone-preview.is-exiting .preview-image {
  opacity: 0;
  transform: scale(1.02) translateX(8px);
}

.milestone-preview.is-animating .preview-image--current {
  opacity: 0;
  transform: scale(0.985) translateX(-10px);
}

.milestone-preview.is-animating .preview-image--next {
  opacity: 1;
  transform: scale(1) translateX(0);
}

.gallery-controls {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
}

.gallery-arrow {
  width: 30px;
  height: 30px;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel) 90%, var(--text) 10%);
  color: var(--text);
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: transform 180ms ease;
}

.gallery-arrow:hover,
.gallery-arrow:focus-visible {
  transform: scale(1.06);
}

.gallery-dots {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.gallery-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text) 30%, transparent 70%);
  border: 0;
  padding: 0;
}

.gallery-dot.is-active {
  background: var(--text);
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: rise 700ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.stagger-1 {
  animation-delay: 70ms;
}

.stagger-2 {
  animation-delay: 140ms;
}

.stagger-3 {
  animation-delay: 210ms;
}

.stagger-4 {
  animation-delay: 280ms;
}

.stagger-5 {
  animation-delay: 350ms;
}

.stagger-6 {
  animation-delay: 420ms;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .left-panel {
    position: static;
  }

  .two-column {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .portrait-frame {
    width: min(360px, 100%);
  }
}

@media (max-width: 860px) {
  .milestone-main {
    grid-template-columns: 1fr;
  }

  .milestone-left h2,
  .milestone-banner {
    font-size: clamp(1.55rem, 4vw, 2rem);
  }

  .preview-description {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .site-header {
    height: 66px;
    padding: 0 14px;
  }

  .brand {
    font-size: 1.8rem;
  }

  .main-nav {
    gap: 16px;
    margin-right: 10px;
  }

  .main-nav a {
    font-size: 0.9rem;
  }

  main {
    width: calc(100% - 24px);
  }

  .footer-inner {
    width: calc(100% - 24px);
    flex-direction: column;
    align-items: flex-start;
  }

  .about-text {
    max-width: 100%;
  }

  .milestone-main {
    padding: 0;
  }

  .milestone-banner {
    min-height: 66px;
    font-size: clamp(1.3rem, 6vw, 1.55rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .stagger-1,
  .stagger-2,
  .stagger-3,
  .stagger-4,
  .stagger-5,
  .stagger-6 {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .theme-toggle {
    transition: none;
  }

  .milestone-banner,
  .gallery-arrow {
    transition: none;
  }
}