/* 全局设计变量：颜色、间距、头部高度和动画曲线。 */
:root {
  --yellow: #ffc400;
  --black: #050505;
  --white: #ffffff;
  --header-height: 92px;
  --gap: 35px;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-page: cubic-bezier(0.16, 0.84, 0.18, 1);
}

/* 基础重置和页面级滚动行为。 */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
  scroll-snap-type: y mandatory;
  overscroll-behavior-y: contain;
}

html.is-snapping-instant {
  scroll-behavior: auto !important;
}

/* 受控整屏段落结束后关闭吸附，让后续内容恢复普通滚动。 */
html.is-after-controlled-scroll {
  scroll-snap-type: none;
}

html.is-after-controlled-scroll .brand-lockup {
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 420ms var(--ease-page),
    filter 420ms var(--ease-page);
}

body {
  margin: 0;
  background: var(--yellow);
  color: var(--black);
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  overflow-x: hidden;
  overscroll-behavior-y: contain;
  -webkit-user-select: none;
  user-select: none;
}

body.menu-open {
  overflow: hidden;
}

/* 常用元素的基础样式。 */
a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

img,
video {
  display: block;
  max-width: 100%;
}

/* 固定头部：排除在页面切换动画之外，让 Studio/menu 视觉上保持固定。 */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: var(--header-height);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--gap);
  pointer-events: none;
  view-transition-name: site-header;
}

.breadcrumb,
.menu-button {
  position: relative;
  z-index: 2;
  color: var(--black);
  font-size: clamp(22px, 2.4vw, 36px);
  line-height: 0.9;
  text-transform: uppercase;
  pointer-events: auto;
}

.site-header.is-dark .breadcrumb,
.site-header.is-dark .menu-button {
  color: var(--yellow);
}

/* 开屏 Logo 停靠后，根据当前背景切换黑色/黄色版本。 */
.theme-dark-logo .brand-lockup.is-docked .brand-logo-black {
  opacity: 0;
}

.theme-dark-logo .brand-lockup.is-docked .brand-logo-yellow {
  opacity: 1;
}

.theme-light-logo .brand-lockup.is-docked .brand-logo-black {
  opacity: 1;
}

.theme-light-logo .brand-lockup.is-docked .brand-logo-yellow {
  opacity: 0;
}

.breadcrumb {
  opacity: 0;
  transform: translateY(-12px);
  transition:
    opacity 300ms var(--ease),
    transform 300ms var(--ease);
}

.site-header.is-scrolled .breadcrumb {
  opacity: 1;
  transform: translateY(0);
}

.menu-button:hover,
.breadcrumb:hover {
  font-style: italic;
}

/* 全屏菜单面板：使用超大字号的作品集式导航。 */
.menu-panel,
.menu-detail-panel {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--gap);
  background: var(--black);
  color: var(--yellow);
  transform: translateY(115%);
  transition: transform 620ms var(--ease);
}

.menu-panel.is-open,
.menu-detail-panel.is-open {
  transform: translateY(0);
}

.menu-close {
  align-self: flex-end;
  color: var(--yellow);
}

.menu-panel nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 1160px;
  margin-top: auto;
  margin-bottom: auto;
  padding-right: 80px;
}

.menu-link {
  display: block;
  margin: 0;
  padding: 0;
  font-size: clamp(76px, 13vw, 180px);
  line-height: 0.86;
  text-align: left;
  text-transform: uppercase;
}

.menu-link:hover {
  font-style: italic;
}

.social-links {
  align-self: flex-end;
  display: flex;
  gap: 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
}

.social-links a:hover {
  font-style: italic;
}

/* 菜单二级页面：和主菜单使用同样的自下而上滑动动效。 */
.menu-detail-panel {
  z-index: 40;
}

.menu-back {
  align-self: flex-start;
  color: var(--yellow);
}

.menu-detail-content {
  width: min(100%, 1520px);
  max-height: calc(100vh - var(--header-height) - var(--gap));
  max-height: calc(100dvh - var(--header-height) - var(--gap));
  margin: auto auto 0;
  padding-top: clamp(18px, 3vw, 44px);
  padding-right: clamp(0px, 2vw, 28px);
  overflow-y: auto;
  outline: 0;
  color: var(--yellow);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  scrollbar-color: var(--yellow) transparent;
}

.menu-detail-heading {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(36px, 5vw, 72px);
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  text-transform: uppercase;
}

.menu-detail-heading span {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(15px, 1.6vw, 22px);
  text-transform: none;
}

.menu-detail-heading h1 {
  margin: 0;
  font-size: clamp(72px, 14vw, 210px);
  line-height: 0.78;
}

.content-quick-nav {
  display: grid;
  gap: 10px;
  max-width: 1180px;
  margin: calc(clamp(36px, 5vw, 72px) * -0.35) 0 clamp(34px, 4vw, 58px);
  padding-bottom: 18px;
  border-bottom: 2px solid currentColor;
  color: var(--yellow);
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
}

.content-quick-nav h2 {
  margin: 0 0 10px;
  font-size: clamp(42px, 7vw, 112px);
  line-height: 0.92;
  text-transform: uppercase;
}

.content-quick-nav button {
  padding: 0;
  font-size: clamp(21px, 2.5vw, 38px);
  line-height: 0.95;
  text-align: left;
  text-transform: uppercase;
}

.content-quick-nav button:hover {
  font-style: italic;
}

.menu-detail-body {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(70px, 9vw, 130px);
  font-size: clamp(16px, 1.55vw, 23px);
  font-weight: 700;
  line-height: 1.72;
}

.menu-detail-body h2,
.menu-detail-body h3,
.menu-detail-body h4 {
  max-width: 1280px;
  margin: clamp(26px, 4vw, 58px) 0 0;
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  line-height: 0.92;
  text-transform: uppercase;
}

.menu-detail-body h2 {
  font-size: clamp(42px, 7vw, 112px);
}

.menu-detail-body h3 {
  font-size: clamp(28px, 4vw, 58px);
}

.menu-detail-body h4 {
  font-size: clamp(22px, 3vw, 38px);
}

.menu-detail-body p,
.menu-detail-body li {
  max-width: 980px;
  margin: 0;
}

.menu-detail-body ul {
  display: grid;
  gap: 6px;
  max-width: 980px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.menu-detail-body li {
  font-weight: 500;
}

.menu-detail-body li::before {
  content: "";
}

.menu-detail-body li.is-list-title {
  margin-top: 12px;
  font-weight: 800;
}

.menu-detail-body li.is-list-title::before {
  content: "- ";
}

.menu-detail-body li.is-list-detail {
  font-weight: 500;
  padding-left: 0.8em;
}

.content-note {
  padding: 16px 20px;
  border: 2px solid currentColor;
}

.content-table {
  width: 100%;
  max-width: 1180px;
  margin: 10px 0 26px;
  overflow-x: auto;
}

.content-table table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: clamp(14px, 1.1vw, 17px);
  line-height: 1.48;
}

.content-table th,
.content-table td {
  border: 2px solid currentColor;
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.content-table th {
  font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
  font-size: 1.08em;
  text-transform: uppercase;
}

/* 开屏首屏和吸附滚动段落。 */
.hero {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--header-height) var(--gap);
  overflow: hidden;
}

.snap-section {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

/* 开屏两行大字：Logo 开始停靠后，两行文字分别从左右滑入。 */
.intro-word {
  position: absolute;
  z-index: 3;
  left: 50%;
  width: max-content;
  margin: 0;
  color: var(--black);
  font-size: clamp(88px, 17vw, 265px);
  font-weight: 900;
  line-height: 0.78;
  text-transform: uppercase;
  opacity: 0;
  pointer-events: none;
  letter-spacing: 0;
}

.intro-word-left {
  top: 39%;
  transform: translate(calc(-50% - 115vw), -50%) scale(0.92);
  animation: slide-in-left 1120ms var(--ease-page) 1280ms forwards;
}

.intro-word-right {
  top: 66%;
  transform: translate(calc(-50% + 115vw), -50%) scale(0.92);
  animation: slide-in-right 1120ms var(--ease-page) 1380ms forwards;
}

/* 开屏 Logo 外层：只负责垂直移动；缩放交给内层，避免横向漂移。 */
.brand-lockup {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 19;
  width: min(112vw, 1680px);
  display: grid;
  place-items: center;
  pointer-events: none;
  transform: translateX(-50%);
  translate: 0 calc(50vh - 50%);
  transform-origin: center;
  opacity: 0;
  filter: blur(18px);
  transition:
    opacity 420ms var(--ease-page),
    filter 420ms var(--ease-page);
  animation:
    brand-fade-in 900ms var(--ease-page) 80ms forwards,
    brand-move-dock 1320ms cubic-bezier(0.13, 0.92, 0.2, 1) 1000ms forwards;
  view-transition-name: hero-logo;
}

.brand-scale {
  width: 100%;
  aspect-ratio: 1672 / 941;
  position: relative;
  display: grid;
  place-items: center;
  transform-origin: top center;
  animation: brand-size-dock 1320ms var(--ease-page) 1000ms forwards;
}

/* 使用两张叠放 PNG 替代 CSS mask，提升本地文件预览的兼容性。 */
/* Logo 停靠完成后，把动画结果固化成普通状态，避免 forwards 动画继续覆盖 opacity。 */
.brand-lockup.is-docked {
  animation: none;
  filter: blur(0);
  opacity: 1;
  translate: 0 0;
}

.brand-lockup.is-docked .brand-scale {
  animation: none;
  transform: scale(0.1285);
}

.brand-logo {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  margin: 0;
  object-fit: contain;
  transition:
    opacity 520ms var(--ease-page),
    filter 520ms var(--ease-page);
}

.brand-logo-black {
  opacity: 1;
}

.brand-logo-yellow {
  opacity: 0;
}

/* 受控整屏故事段落：从首屏到 05 使用一次滚动切一屏的交互。 */
.story-section {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: var(--black);
  color: var(--yellow);
  isolation: isolate;
}

.story-section.is-inverse {
  background: var(--yellow);
  color: var(--black);
}

.story-section img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.18);
  opacity: 0;
  transform: scale(1.14);
  transition:
    opacity 505ms ease,
    transform 800ms var(--ease);
}

/* 背景遮罩：保证文字可读，同时保留强烈的黑黄视觉。 */
.story-section::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(0, 0, 0, 0.42);
  opacity: 0;
  transition: opacity 505ms ease;
}

.story-section.is-inverse::after {
  background: rgba(255, 196, 0, 0.44);
  mix-blend-mode: multiply;
}

/* 故事标题入场：延迟后使用从上到下的遮罩揭示，并向下移动到位。 */
.story-copy {
  width: min(100% - 40px, 1320px);
  text-align: center;
  transform: translateY(-88px);
  opacity: 1;
  clip-path: inset(0 0 100% 0);
  transition-delay: 0ms;
  transition:
    clip-path 820ms var(--ease-page),
    transform 820ms var(--ease-page);
}

.story-copy span {
  display: block;
  margin-bottom: 22px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(16px, 1.8vw, 24px);
}

.story-copy h2 {
  margin: 0;
  font-size: clamp(58px, 9vw, 150px);
  font-weight: 900;
  line-height: 0.86;
  text-transform: uppercase;
  white-space: nowrap;
}

.story-section.is-active img {
  opacity: 0.82;
  transform: scale(1);
}

.story-section.is-active::after {
  opacity: 1;
}

.story-section.is-active .story-copy {
  transform: translateY(0);
  clip-path: inset(0 0 0 0);
  transition-delay: 600ms;
}

/* 分类跑马灯：连接受控整屏段落和后续普通内容。 */
.marquee-strip {
  overflow: hidden;
  border-top: 2px solid var(--black);
  border-bottom: 2px solid var(--black);
  background: var(--black);
  color: var(--yellow);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 22s linear infinite;
}

.marquee-group {
  display: flex;
  flex: 0 0 auto;
}

.marquee-group span {
  padding: 12px 28px 10px;
  font-size: clamp(32px, 5vw, 74px);
  line-height: 0.9;
  text-transform: uppercase;
  white-space: nowrap;
}

/* 05 之后的普通网页内容区。 */
.work-section,
.about-section,
.contact-section {
  padding: clamp(70px, 9vw, 130px) var(--gap);
}

.work-section {
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: clamp(49px, 6.3vw, 91px);
  padding-bottom: clamp(35px, 4.5vw, 65px);
}

.work-section h2 {
  margin: 0 0 84px;
  font-size: clamp(82px, 16vw, 240px);
  font-weight: 900;
  line-height: 0.78;
  text-align: center;
  text-transform: uppercase;
}

.work-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

/* 作品卡片：悬停时图片缩放，并从边缘向内生成黑色边框。 */
.work-card {
  position: relative;
  min-height: 500px;
  overflow: hidden;
  background: var(--black);
  color: var(--yellow);
}

.work-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  box-shadow: inset 0 0 0 0 var(--black);
  opacity: 0;
  pointer-events: none;
  transition:
    box-shadow 420ms var(--ease-page),
    opacity 180ms ease;
}

.work-card:hover::before {
  box-shadow: inset 0 0 0 8px var(--black);
  opacity: 1;
}

.work-card img {
  width: 100%;
  height: 100%;
  min-height: inherit;
  object-fit: cover;
  filter: grayscale(1) contrast(1.1);
  mix-blend-mode: luminosity;
  opacity: 0.82;
  transition:
    transform 350ms var(--ease),
    opacity 300ms ease;
}

.work-card:hover img {
  transform: scale(1.06);
  opacity: 1;
}

.work-card div {
  position: absolute;
  inset: auto 18px 16px;
  z-index: 4;
}

.work-card span {
  display: block;
  margin-bottom: 6px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
}

.work-card h3 {
  margin: 0;
  font-size: clamp(42px, 5vw, 76px);
  line-height: 0.86;
  text-transform: uppercase;
}

.about-section {
  display: grid;
  place-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--black);
  color: var(--yellow);
}

.about-section p {
  max-width: 1320px;
  margin: 0 auto;
  font-size: clamp(58px, 9vw, 155px);
  line-height: 0.86;
  text-align: center;
  text-transform: uppercase;
}

.contact-section {
  display: grid;
  place-items: center;
  min-height: 35vh;
  padding-top: clamp(35px, 4.5vw, 65px);
  padding-bottom: clamp(35px, 4.5vw, 65px);
}

.contact-section a {
  font-size: clamp(46px, 10vw, 150px);
  line-height: 0.86;
  text-transform: uppercase;
}

.contact-section a:hover {
  font-style: italic;
}

/* 普通滚动区的通用入场效果。 */
[data-reveal] {
  opacity: 0;
  transform: translateY(72px);
  transition:
    opacity 560ms ease,
    transform 760ms var(--ease-page);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* 跑马灯循环移动动画。 */
@keyframes marquee {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-50%);
  }
}

/* 开屏左右文字滑入动画。 */
@keyframes slide-in-left {
  to {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

@keyframes slide-in-right {
  to {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

/* Logo 开屏动画：淡入、缩放、垂直移动分离，运动更稳定。 */
@keyframes brand-fade-in {
  to {
    opacity: 1;
    filter: blur(0);
  }
}

@keyframes brand-size-dock {
  from {
    transform: scale(1);
    filter: blur(0);
  }

  to {
    transform: scale(0.1285);
    filter: blur(0);
    opacity: 1;
  }
}

@keyframes brand-move-dock {
  68% {
    translate: 0 2px;
  }

  to {
    translate: 0 0px;
  }
}

/* 浏览器 View Transition：控制整屏切换时的新旧页面运动。 */
::view-transition-old(root),
::view-transition-new(root) {
  animation-timing-function: var(--ease-page);
  animation-fill-mode: both;
}

::view-transition-old(root) {
  z-index: 2;
  animation-duration: 410ms;
}

::view-transition-new(root) {
  z-index: 1;
  animation-delay: 230ms;
  animation-duration: 1050ms;
}

::view-transition-group(site-header) {
  z-index: 10;
  animation: none;
}

::view-transition-old(site-header),
::view-transition-new(site-header) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(site-header) {
  opacity: 0;
}

::view-transition-group(hero-logo) {
  z-index: 9;
  animation: none;
}

::view-transition-old(hero-logo),
::view-transition-new(hero-logo) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(hero-logo) {
  opacity: 0;
}

/* 向下切换：当前页向上退出，下一页从下方进入。 */
html.page-next::view-transition-old(root) {
  animation-name: page-old-up;
}

html.page-next::view-transition-new(root) {
  animation-name: page-new-up;
}

html.page-prev::view-transition-old(root) {
  animation-name: page-old-down;
}

html.page-prev::view-transition-new(root) {
  animation-name: page-new-down;
}

/* 向下切换时，当前页的退出动画。 */
@keyframes page-old-up {
  from {
    transform: translateY(0) scale(1);
    opacity: 1;
  }

  45% {
    transform: translateY(-28vh) scale(0.86);
    opacity: 1;
  }

  to {
    transform: translateY(-112vh) scale(0.86);
    opacity: 1;
  }
}

/* 向下切换时，下一页先到达中央，再放大填满屏幕。 */
@keyframes page-new-up {
  from {
    transform: translateY(112vh) scale(0.86);
    opacity: 1;
  }

  39% {
    transform: translateY(0) scale(0.915);
    opacity: 1;
  }

  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

/* 向上切换时，当前页的退出动画。 */
@keyframes page-old-down {
  from {
    transform: translateY(0) scale(1);
    opacity: 1;
  }

  45% {
    transform: translateY(28vh) scale(0.86);
    opacity: 1;
  }

  to {
    transform: translateY(112vh) scale(0.86);
    opacity: 1;
  }
}

/* 向上切换时，下一页的进入动画。 */
@keyframes page-new-down {
  from {
    transform: translateY(-112vh) scale(0.86);
    opacity: 1;
  }

  39% {
    transform: translateY(0) scale(0.915);
    opacity: 1;
  }

  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

/* 动效安全：尊重用户系统中的减少动态效果设置。 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
    scroll-snap-type: none;
  }

  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation: none !important;
  }

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

/* 平板和窄桌面布局适配。 */
@media (max-width: 900px) {
  :root {
    --header-height: 70px;
    --gap: 20px;
  }

  .menu-panel nav {
    padding-right: 0;
  }

  .menu-link {
    font-size: clamp(62px, 20vw, 104px);
  }

  .brand-lockup {
    width: min(120vw, 920px);
  }

  .brand-scale {
    aspect-ratio: 1672 / 941;
  }

  .brand-logo {
    height: 100%;
  }

  .intro-word {
    font-size: clamp(68px, 18vw, 156px);
  }

  .intro-word-left {
    top: 40%;
  }

  .intro-word-right {
    top: 64%;
  }

  .story-copy h2 {
    font-size: clamp(52px, 16vw, 96px);
  }

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

  .work-card {
    min-height: 380px;
  }
}

/* 手机端：调整头部和开屏文字尺寸。 */
@media (max-width: 520px) {
  .breadcrumb,
  .menu-button {
    font-size: 22px;
  }

  .social-links {
    align-self: flex-start;
  }

  .brand-logo {
    height: 100%;
  }

  .intro-word {
    font-size: clamp(54px, 17vw, 92px);
  }

  .intro-word-left {
    top: 41%;
  }

  .intro-word-right {
    top: 63%;
  }
}