:root {
  --bg: #0f1722;
  --bg-soft: #131d2a;
  --panel: rgba(23, 34, 49, 0.96);
  --text: #e9eff8;
  --muted: #a9bbcf;
  --line: #3f536b;
  --ink: #9fc0dd;
  --accent: #5d85aa;
  --highlight: #f3c46d;
  --shadow: rgba(3, 8, 14, 0.42);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: 'Sora', sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

.page-shell {
  position: relative;
  z-index: 1;
  width: min(1600px, 96vw);
  margin: 0 auto;
  padding: 44px 0 84px;
}

.hero {
  padding: 12px 0 30px;
}

.back-link {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid #375171;
  background: rgba(18, 30, 45, 0.65);
  padding: 9px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.back-link:hover {
  transform: translateY(-2px);
  background: rgba(27, 42, 62, 0.9);
  border-color: #4f739b;
}

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.84rem;
  color: var(--ink);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.11em;
}

.hero h1 {
  margin: 8px 0 12px;
  font-size: clamp(2.1rem, 5vw, 3.8rem);
  line-height: 1.06;
}

.hero-copy {
  max-width: 800px;
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.timeline-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: 8px 0 18px;
}

.timeline-pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 14px;
  margin: 0 0 14px;
  padding: 10px 14px;
  border: 1px solid #2e465f;
  border-radius: 14px;
  background: rgba(17, 28, 42, 0.92);
}

.timeline-pagination-status {
  margin: 0;
  color: #d8e3ef;
  font-size: 0.92rem;
}

.timeline-pagination-status span {
  color: var(--highlight);
  font-weight: 700;
  font-family: 'IBM Plex Mono', monospace;
}

.timeline-jump-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.timeline-jump-btn {
  border: 1px solid #456484;
  background: #162738;
  color: #d6e4f2;
  border-radius: 9px;
  min-width: 34px;
  height: 32px;
  padding: 0 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.timeline-jump-btn:hover {
  transform: translateY(-1px);
  border-color: #6f95bb;
  background: #213851;
}

.timeline-jump-btn.active {
  color: #111b27;
  background: var(--highlight);
  border-color: rgba(243, 196, 109, 0.84);
  font-weight: 700;
}

.timeline-hint {
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

.nav-btn {
  border: 1px solid #3e5d80;
  background: #18283b;
  color: var(--ink);
  border-radius: 12px;
  width: 42px;
  height: 42px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: transform 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.nav-btn:hover {
  transform: translateY(-1px);
  background: #213751;
  border-color: #5d85aa;
}

.nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
}

.timeline-section {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  border: 1px solid #2b3f56;
  background: #101a28;
  border-radius: 24px;
  padding: 20px 20px 18px;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
  scroll-padding-left: 22px;
  scroll-padding-right: 22px;
  touch-action: pan-x;
  overscroll-behavior-x: contain;
  cursor: grab;
  scrollbar-color: #6f98be #162536;
}

.timeline-section::-webkit-scrollbar {
  height: 12px;
}

.timeline-section::-webkit-scrollbar-track {
  background: #132131;
  border-radius: 999px;
  border: 1px solid #2a3f56;
}

.timeline-section::-webkit-scrollbar-thumb {
  background: #6f98be;
  border-radius: 999px;
  border: 2px solid #132131;
}

.timeline-section::-webkit-scrollbar-thumb:hover {
  background: #8cb2d5;
}

.timeline-section:active {
  cursor: grabbing;
}

.timeline-progress-rail {
  position: absolute;
  left: 14px;
  right: 14px;
  top: calc(50% + 2px);
  height: 6px;
  background: #1a2a3d;
  border: 1px solid #34506e;
  border-radius: 999px;
  z-index: 0;
}

.timeline-root {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 72px;
  width: max-content;
  min-width: calc(100% - 12px);
  padding: 10px 22px;
}

.timeline-item.first {
  margin-left: 2px;
}

.timeline-item.last {
  margin-right: 2px;
}

.timeline-line-progress {
  width: 0;
  height: 100%;
  background: #6f98be;
  border-radius: 999px;
  transition: width 0.16s linear;
}

.timeline-item {
  --reveal-delay: 0ms;
  min-width: 470px;
  max-width: 470px;
  display: grid;
  grid-template-rows: minmax(0, auto) 82px minmax(0, auto);
  gap: 18px;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  scroll-snap-align: start;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline-item.top .timeline-card {
  grid-row: 1;
  align-self: end;
}

.timeline-item.bottom .timeline-card {
  grid-row: 3;
  align-self: start;
}

.timeline-item.top .timeline-date-panel {
  grid-row: 3;
}

.timeline-item.bottom .timeline-date-panel {
  grid-row: 1;
  align-self: end;
}

.timeline-spine {
  grid-row: 2;
  position: relative;
}

.timeline-spine::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -32px;
  right: -32px;
  height: 3px;
  background: var(--line);
  transform: translateY(-50%);
}

.timeline-item.first .timeline-spine::before {
  left: 50%;
}

.timeline-item.last .timeline-spine::before {
  right: 50%;
}

.timeline-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 3px solid var(--highlight);
  background: #172435;
  z-index: 1;
  animation: dotPulse 2.8s ease-in-out infinite;
}

.timeline-card,
.timeline-date-panel {
  opacity: 0;
  transform: translateY(16px) scale(0.985);
}

.timeline-item.visible .timeline-card {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: var(--reveal-delay);
}

.timeline-item.visible .timeline-date-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: calc(var(--reveal-delay) + 90ms);
}

.timeline-card {
  position: relative;
  background: var(--panel);
  border: 1px solid #30465f;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 42px var(--shadow);
  transition: transform 0.32s cubic-bezier(0.2, 0.7, 0.1, 1), box-shadow 0.32s ease, border-color 0.32s ease;
}

.timeline-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 54px rgba(2, 8, 14, 0.6);
  border-color: #4d7094;
}

.timeline-date-panel {
  margin: 0;
  border-radius: 14px;
  background: #1b2b3f;
  border: 1px solid rgba(243, 196, 109, 0.55);
  box-shadow: 0 10px 24px rgba(3, 8, 14, 0.35);
  padding: 12px 14px;
}

.timeline-side-date {
  margin: 0;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--highlight);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.timeline-side-date-note {
  margin: 7px 0 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: #d3deea;
}

.timeline-title {
  margin: 0 0 10px;
  font-size: 1.58rem;
  line-height: 1.18;
}

.timeline-description {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.72;
  font-size: 0.98rem;
}

.timeline-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid #36506c;
  margin-bottom: 14px;
}

.timeline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.timeline-tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: #d7e3ef;
  border: 1px solid #3f5874;
  border-radius: 999px;
  padding: 4px 8px;
  background: rgba(24, 38, 56, 0.88);
}

.timeline-link {
  display: inline-block;
  color: #0e1722;
  text-decoration: none;
  font-weight: 700;
  background: #a9bfd2;
  padding: 10px 14px;
  border-radius: 10px;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.timeline-link:hover {
  transform: translateY(-2px);
  filter: brightness(1.07);
}

@media (max-width: 1200px) {
  .timeline-root {
    gap: 50px;
  }

  .timeline-item {
    min-width: 420px;
    max-width: 420px;
    grid-template-rows: minmax(0, auto) 78px minmax(0, auto);
  }

  .timeline-image {
    height: 230px;
  }
}

@media (max-width: 900px) {
  .page-shell {
    width: min(100%, 94vw);
    padding: 30px 0 54px;
  }

  .hero {
    padding: 8px 0 20px;
  }

  .hero h1 {
    margin: 7px 0 10px;
    line-height: 1.1;
  }

  .hero-copy {
    line-height: 1.65;
  }

  .timeline-toolbar {
    justify-content: center;
    gap: 0;
    margin-bottom: 10px;
  }

  .nav-btn {
    display: none;
  }

  .timeline-hint {
    display: none;
  }

  .timeline-pagination {
    padding: 10px 12px;
    margin-bottom: 10px;
    border-radius: 12px;
  }

  .timeline-pagination-status {
    width: 100%;
    text-align: left;
    margin-bottom: 2px;
  }

  .timeline-jump-buttons {
    width: 100%;
    justify-content: flex-start;
  }

  .timeline-section {
    overflow: visible;
    cursor: default;
    touch-action: pan-y;
    padding: 8px 0 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    scroll-snap-type: none;
    scroll-padding-left: 0;
    scroll-padding-right: 0;
  }

  .timeline-progress-rail {
    display: none;
  }

  .timeline-root {
    width: 100%;
    min-width: 0;
    display: grid;
    gap: 20px;
    padding: 0;
  }

  .timeline-item {
    min-width: 0;
    max-width: none;
    width: 100%;
    display: grid;
    grid-template-columns: 48px 1fr;
    grid-template-rows: auto auto;
    gap: 8px 12px;
    scroll-snap-align: none;
  }

  .timeline-item.first,
  .timeline-item.last {
    margin: 0;
  }

  .timeline-item .timeline-date-panel {
    grid-column: 2;
    grid-row: 1;
  }

  .timeline-item .timeline-card {
    grid-column: 2;
    grid-row: 2;
    align-self: stretch;
  }

  .timeline-item.top .timeline-card,
  .timeline-item.bottom .timeline-card,
  .timeline-item.top .timeline-date-panel,
  .timeline-item.bottom .timeline-date-panel {
    grid-column: 2;
    align-self: stretch;
  }

  .timeline-spine {
    grid-column: 1;
    grid-row: 1 / span 2;
    position: relative;
    min-height: 100%;
  }

  .timeline-spine::before {
    left: 50%;
    right: auto;
    top: -12px;
    bottom: -12px;
    width: 3px;
    height: auto;
    transform: translateX(-50%);
  }

  .timeline-item.first .timeline-spine::before,
  .timeline-item.last .timeline-spine::before {
    left: 50%;
    right: auto;
  }

  .timeline-dot {
    top: 22px;
    left: 50%;
    transform: translate(-50%, 0);
  }

  .timeline-image {
    height: 186px;
  }

  .timeline-side-date-note {
    font-size: 0.76rem;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100%, 94vw);
    padding: 22px 0 44px;
  }

  .hero {
    padding: 4px 0 14px;
  }

  .back-link {
    margin-bottom: 14px;
    padding: 8px 12px;
  }

  .timeline-toolbar {
    margin-top: 2px;
    margin-bottom: 8px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .timeline-hint {
    font-size: 0.78rem;
    width: 100%;
  }

  .timeline-section {
    padding-top: 4px;
  }

  .timeline-pagination {
    padding: 8px 10px;
    margin-bottom: 8px;
    gap: 6px;
  }

  .timeline-pagination-status {
    font-size: 0.8rem;
  }

  .timeline-jump-btn {
    min-width: 28px;
    height: 28px;
    font-size: 0.68rem;
    padding: 0 6px;
  }

  .timeline-root {
    gap: 14px;
  }

  .timeline-item {
    grid-template-columns: 34px 1fr;
    gap: 6px 9px;
  }

  .timeline-card {
    padding: 12px;
    border-radius: 14px;
  }

  .timeline-date-panel {
    padding: 8px 10px;
    border-radius: 10px;
  }

  .timeline-title {
    font-size: 1.12rem;
    margin-bottom: 8px;
  }

  .timeline-description {
    margin-bottom: 10px;
    line-height: 1.55;
    font-size: 0.9rem;
  }

  .timeline-image {
    height: 148px;
    margin-bottom: 10px;
    border-radius: 10px;
  }

  .timeline-side-date {
    font-size: 0.76rem;
  }

  .timeline-side-date-note {
    margin-top: 5px;
    font-size: 0.66rem;
  }
}

@keyframes dotPulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(243, 196, 109, 0.22);
  }
  50% {
    box-shadow: 0 0 0 7px rgba(243, 196, 109, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .timeline-item,
  .timeline-card,
  .timeline-date-panel,
  .timeline-link,
  .back-link,
  .nav-btn,
  .timeline-dot {
    transition: none;
    animation: none;
  }
}