:root {
  --blue: #2358ed;
  --deep-blue: #123d8d;
  --ink: #15365f;
  --ice: #edf8ff;
  --white: #ffffff;
  --accent: #5fffc5;
  --progress: #2358ec;
  --chapter-active: #00f698;
  --page-gap: 32px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --z-chrome: 30;
  --z-dialog: 50;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

html::-webkit-scrollbar,
body::-webkit-scrollbar {
  width: 0;
  height: 0;
  display: none;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--ice);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
}

body.index-open {
  overflow: hidden;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

img {
  display: block;
}

.skip-link {
  position: fixed;
  z-index: calc(var(--z-dialog) + 1);
  top: 12px;
  left: 50%;
  padding: 10px 16px;
  color: var(--white);
  background: var(--deep-blue);
  text-decoration: none;
  transform: translate(-50%, -160%);
  transition: transform 180ms var(--ease-out);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.site-chrome {
  position: fixed;
  z-index: var(--z-chrome);
  top: 18px;
  right: 18px;
  left: 18px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  pointer-events: none;
}

.site-chrome,
.chapter-rail,
.reading-status {
  visibility: hidden;
  opacity: 0;
  transition: opacity 180ms ease, visibility 180ms ease;
}

body.case-deck-active .site-chrome,
body.case-deck-active .chapter-rail,
body.case-deck-active .reading-status {
  visibility: visible;
  opacity: 1;
}

.chrome-button {
  position: relative;
  display: flex;
  width: 48px;
  height: 48px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  align-items: center;
  gap: 12px;
  border: 0;
  border-radius: 24px;
  color: var(--deep-blue);
  background: transparent;
  box-shadow: none;
  cursor: pointer;
  pointer-events: auto;
  transition: width 300ms var(--ease-out), border-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.chrome-button:hover {
  width: 126px;
  color: var(--blue);
  background: transparent;
  border-color: var(--blue);
}

.chrome-button:active {
  transform: scale(0.96);
}

.chrome-button:focus-visible,
.chapter-link:focus-visible,
.index-jump:focus-visible,
.close-index:focus-visible,
.reading-status:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.menu-button {
  padding-left: 15px;
}

.menu-button > span:last-child,
.fullscreen-label,
.return-label {
  flex: none;
  color: currentColor;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 150ms ease 40ms;
}

.menu-button:hover > span:last-child,
.menu-button:focus-visible > span:last-child,
.fullscreen-button:hover .fullscreen-label,
.fullscreen-button:focus-visible .fullscreen-label {
  opacity: 1;
}

.menu-icon,
.fullscreen-icon,
.return-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
  flex: none;
}

.fullscreen-button {
  justify-content: flex-end;
  padding: 0 15px 0 0;
}

.menu-icon svg,
.fullscreen-icon svg,
.return-icon svg {
  display: block;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.site-signature {
  position: fixed;
  bottom: 48px;
  left: 30px;
  display: flex;
  margin: 0;
  padding: 12px 7px;
  align-items: center;
  gap: 12px;
  color: var(--deep-blue);
  background: transparent;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.045em;
  line-height: 1;
  pointer-events: auto;
  text-orientation: mixed;
  user-select: text;
  white-space: nowrap;
  writing-mode: vertical-rl;
  cursor: text;
}

.site-signature > span {
  font-size: 9px;
}

.site-signature small {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.chapter-rail {
  position: fixed;
  z-index: var(--z-chrome);
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
  pointer-events: none;
}

body.case-deck-active .chapter-rail {
  pointer-events: auto;
}

.chapter-rail ol {
  display: flex;
  margin: 0;
  padding: 0;
  flex-direction: column;
  gap: 34px;
  list-style: none;
}

.chapter-rail li {
  position: relative;
  width: 18px;
  height: 18px;
}

.chapter-link {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.chapter-link::before {
  position: absolute;
  top: 5px;
  left: 5px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgb(18 61 141 / 25%);
  content: "";
  transition: transform 220ms var(--ease-out), background-color 220ms ease;
}

.chapter-link:hover::before,
.chapter-link[aria-current="true"]::before {
  background: var(--chapter-active);
  transform: scale(1.55);
}

.chapter-link span {
  position: absolute;
  top: 50%;
  right: 26px;
  width: max-content;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--white);
  background: #2358ec;
  font-size: 11px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translate(8px, -50%);
  transition: opacity 150ms ease, transform 220ms var(--ease-out);
}

.chapter-link span::after {
  position: absolute;
  top: 50%;
  right: -6px;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 7px solid #2358ec;
  content: "";
  transform: translateY(-50%);
}

.chapter-link:hover span,
.chapter-link:focus-visible span,
.chapter-link[aria-current="true"] span {
  opacity: 1;
  transform: translate(0, -50%);
}

.chapter-progress {
  position: absolute;
  top: 18px;
  left: 8px;
  width: 2px;
  height: 34px;
  overflow: hidden;
  border-radius: 999px;
  background: rgb(35 88 236 / 16%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.chapter-progress-value {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: var(--progress);
  transform: scaleY(0);
  transform-origin: center top;
  transition: transform 220ms var(--ease-out);
}

.chapter-link[aria-current="true"] + .chapter-progress {
  opacity: 1;
}

.case-deck {
  display: flex;
  width: 100%;
  margin: 0;
  padding: 0;
  flex-direction: column;
  gap: var(--page-gap);
  background-color: transparent;
  background-image:
    linear-gradient(90deg, #ffffff 0%, rgb(255 255 255 / 72%) 22%, rgb(255 255 255 / 66%) 100%),
    url("./assets/02-experience/bg.webp");
  background-position: top center, top center;
  background-repeat: no-repeat, repeat-y;
  background-size: 100% 100%, 100% auto;
}

.case-page {
  position: relative;
  display: grid;
  min-height: 100svh;
  overflow: clip;
  place-items: center;
  background: transparent;
  scroll-snap-align: center;
  scroll-snap-stop: normal;
}

.case-page:nth-child(even) {
  background: transparent;
}

.case-page--long {
  min-height: auto;
}

.case-page__frame {
  position: relative;
  width: min(100vw, calc(100svh * 1.6), 1600px);
  aspect-ratio: 8 / 5;
  margin: 0;
  overflow: hidden;
}

.case-page__frame--long {
  width: min(100vw, 1280px);
  aspect-ratio: 1280 / 6160;
}

.case-page__frame::after {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: rgb(18 61 141 / 35%);
  content: attr(data-page-label);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  transition: opacity 320ms ease;
}

.case-page__frame.is-loaded::after {
  opacity: 0;
  pointer-events: none;
}

.case-page__frame.is-error::after {
  color: var(--deep-blue);
  content: "图片加载失败，请刷新页面";
  opacity: 1;
}

.case-page img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.motion-showcase {
  position: absolute;
  z-index: 2;
  inset: 0;
  color: var(--ink);
}

.motion-showcase__title {
  position: absolute;
  top: 25.2%;
  left: 6.6%;
  margin: 0;
  color: #19345a;
  font-size: clamp(15px, 1.45vw, 24px);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.3;
}

.motion-showcase__main {
  position: absolute;
  top: 31%;
  left: 6.6%;
  width: 68.8%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #0d1420;
  box-shadow: 0 12px 34px rgb(21 54 95 / 12%);
}

.motion-showcase__main-video,
.motion-showcase__preview-video {
  display: block;
  width: 100%;
  height: 100%;
  background: #0d1420;
  object-fit: cover;
}

.motion-showcase__previews {
  position: absolute;
  top: 5.3%;
  right: 5.9%;
  bottom: 5.3%;
  display: flex;
  width: 13.5%;
  flex-direction: column;
  justify-content: space-between;
}

.motion-showcase__preview {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 0;
  background: transparent;
  box-shadow: 0 8px 22px rgb(21 54 95 / 9%);
  cursor: pointer;
  transition: box-shadow 220ms var(--ease-out), transform 220ms var(--ease-out);
}

.motion-showcase__preview:hover {
  box-shadow: 0 12px 30px rgb(21 54 95 / 18%);
  transform: translateX(-4px);
}

.motion-showcase__preview[aria-pressed="true"] {
  box-shadow: 0 0 0 2px var(--blue), 0 10px 26px rgb(21 54 95 / 16%);
}

.motion-showcase__preview:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.motion-showcase__preview-video {
  width: calc(100% + 2px);
  height: calc(100% + 2px);
  margin: -1px;
  background: transparent;
  pointer-events: none;
}

.splash-screen-video {
  position: absolute;
  z-index: 2;
  top: calc(21.4% + 20px);
  left: 14.2%;
  display: block;
  width: 20.4%;
  height: auto;
  aspect-ratio: 1080 / 2338;
  border: 0;
  background: transparent;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
}

.case-page .case-page__overlay-image {
  position: absolute;
  z-index: 3;
  pointer-events: none;
}

.case-page .case-page__overlay-media {
  position: absolute;
  z-index: 2;
  display: block;
  pointer-events: none;
}

.case-page .microcourse-device-overlay,
.case-page .microcourse-device-video {
  top: 9.63%;
  left: 68.87%;
  width: 25.46%;
  height: 85.37%;
}

.case-page .microcourse-device-overlay {
  object-fit: fill;
}

.case-page .microcourse-device-video {
  object-fit: cover;
  object-position: center;
  clip-path: inset(1.35% 3.5% 1.45% 3.5% round 10.5% / 5%);
  background: transparent;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.reading-status {
  position: fixed;
  z-index: var(--z-chrome);
  right: 24px;
  bottom: 24px;
  display: flex;
  width: 48px;
  min-width: 48px;
  height: 48px;
  margin: 0;
  padding: 0 15px 0 0;
  overflow: hidden;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  border: 0;
  border-radius: 24px;
  appearance: none;
  color: var(--deep-blue);
  background: transparent;
  box-shadow: none;
  cursor: pointer;
  transition: width 300ms var(--ease-out), color 180ms ease, transform 180ms var(--ease-out);
}

.reading-status:hover,
.reading-status:focus-visible {
  width: 126px;
  color: var(--blue);
  background: transparent;
  box-shadow: none;
}

.reading-status:hover .return-label,
.reading-status:focus-visible .return-label {
  opacity: 1;
}

.reading-status:active {
  transform: translateY(0) scale(0.96);
}

.work-index {
  position: fixed;
  z-index: var(--z-dialog);
  inset: 0 auto 0 0;
  width: 50vw;
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-right: 1px solid rgb(255 255 255 / 32%);
  color: var(--white);
  background: rgb(27 76 178 / 76%);
  backdrop-filter: blur(24px) saturate(1.18);
  -webkit-backdrop-filter: blur(24px) saturate(1.18);
}

.work-index::backdrop {
  background: rgb(13 40 97 / 22%);
}

.work-index[open] {
  animation: index-enter 360ms var(--ease-out) both;
}

.index-shell {
  display: grid;
  width: 100%;
  height: 100%;
  min-height: 0;
  margin: 0;
  padding: clamp(20px, 3.5vh, 34px) clamp(24px, 3vw, 46px) clamp(16px, 2.8vh, 28px);
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.index-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: clamp(14px, 2.5vh, 24px);
}

.index-header p {
  margin: 0 0 5px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0.62;
}

.index-header h1 {
  margin: 0;
  font-size: clamp(30px, 3.8vw, 52px);
  line-height: 0.95;
  letter-spacing: -0.035em;
}

.close-index {
  position: relative;
  width: 42px;
  height: 42px;
  margin: 0;
  padding: 0;
  flex: none;
  border: 1px solid rgb(255 255 255 / 45%);
  border-radius: 50%;
  color: var(--white);
  background: transparent;
  cursor: pointer;
  transition: color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.close-index::before,
.close-index::after {
  position: absolute;
  top: 19px;
  left: 11px;
  width: 19px;
  height: 2px;
  background: currentColor;
  content: "";
}

.close-index::before {
  transform: rotate(45deg);
}

.close-index::after {
  transform: rotate(-45deg);
}

.close-index:hover {
  color: var(--deep-blue);
  background: var(--accent);
  transform: rotate(6deg);
}

.index-list {
  display: grid;
  min-height: 0;
  margin: 0;
  padding: 0;
  grid-template-rows: repeat(5, minmax(0, 1fr));
  list-style: none;
  border-top: 1px solid rgb(255 255 255 / 35%);
}

.index-list li {
  min-height: 0;
  border-bottom: 1px solid rgb(255 255 255 / 35%);
}

.index-jump {
  display: grid;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 8px 0;
  align-items: center;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 12px;
  border: 0;
  color: var(--white);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: color 220ms ease, padding 260ms var(--ease-out);
}

.index-jump:hover {
  padding-left: 10px;
  color: var(--accent);
}

.index-number {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
  opacity: 0.7;
}

.index-title {
  font-size: clamp(18px, 1.85vw, 32px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.index-meta {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0.7;
}

.index-footer {
  display: flex;
  padding-top: clamp(10px, 2vh, 18px);
  flex-wrap: wrap;
  gap: 14px 32px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.06em;
  opacity: 0.66;
}

.index-plane-follower {
  position: fixed;
  z-index: 2;
  top: 0;
  left: 0;
  display: block;
  width: 46px;
  height: 25px;
  color: #b7d5e9;
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  will-change: transform, opacity;
}

.index-plane-follower svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.index-plane-follower__trail {
  stroke-width: 1;
}

.index-plane-follower__plane {
  fill: url(#index-plane-fill);
  stroke-width: 1.25;
}

.index-plane-follower__fold {
  stroke-width: 1.05;
}

.noscript-message {
  position: fixed;
  z-index: var(--z-dialog);
  inset: 0;
  display: grid;
  margin: 0;
  place-items: center;
  color: var(--white);
  background: var(--deep-blue);
}

@keyframes loading-sheen {
  from { background-position: 100% 0; }
  to { background-position: -100% 0; }
}

@keyframes index-enter {
  from { opacity: 0; transform: translateX(-32px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 899px) {
  .work-index {
    width: min(84vw, 560px);
  }
}

@media (max-height: 520px) {
  .index-shell {
    padding-top: 12px;
    padding-bottom: 10px;
  }

  .index-header {
    padding-bottom: 8px;
  }

  .index-header p,
  .index-footer {
    display: none;
  }

  .index-header h1 {
    font-size: 28px;
  }

  .index-jump {
    padding-top: 4px;
    padding-bottom: 4px;
  }

  .index-title {
    font-size: clamp(17px, 1.5vw, 25px);
  }
}

@media (max-width: 899px), (orientation: portrait) {
  :root {
    --page-gap: 16px;
  }

  .chapter-rail {
    display: none;
  }

  .case-page {
    min-height: auto;
  }

  .case-page__frame {
    width: 100vw;
  }

  .motion-showcase__title {
    font-size: clamp(10px, 1.45vw, 16px);
  }
}

@media (max-width: 640px) {
  .site-chrome {
    top: 12px;
    right: 12px;
    left: 12px;
  }

  .chrome-button,
  .chrome-button:hover {
    width: 44px;
    height: 44px;
    border-radius: 22px;
  }

  .menu-button:hover > span:last-child,
  .menu-button:focus-visible > span:last-child,
  .fullscreen-button:hover .fullscreen-label,
  .fullscreen-button:focus-visible .fullscreen-label {
    opacity: 0;
  }

  .menu-button {
    padding-left: 13px;
  }

  .fullscreen-button {
    padding: 0 13px 0 0;
  }

  .site-signature {
    bottom: 48px;
    left: 22px;
    padding: 10px 6px;
    gap: 10px;
    font-size: 11px;
  }

  .site-signature small {
    font-size: 8px;
  }

  .reading-status,
  .reading-status:hover,
  .reading-status:focus-visible {
    right: 12px;
    bottom: 14px;
    width: 44px;
    min-width: 44px;
    height: 44px;
    padding: 0 13px 0 0;
  }

  .reading-status:hover .return-label,
  .reading-status:focus-visible .return-label {
    opacity: 0;
  }

  .index-shell {
    width: 100%;
    padding: 20px 18px 16px;
  }

  .index-header {
    padding-bottom: 14px;
  }

  .index-jump {
    min-height: 0;
    padding: 7px 0;
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 8px;
  }

  .index-meta {
    display: none;
  }

  .index-title {
    font-size: clamp(18px, 6vw, 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .index-plane-follower {
    display: none;
  }
}

@media (pointer: coarse) {
  .index-plane-follower {
    display: none;
  }
}