:root {
  --header-h: 72px;
  --header-height: 72px;
  --paper: #f7f1ed;
  --canvas: #f7f1ed;
  --canvas-media: #f7f1ed;
  --ink: #171513;
  --ink-primary: #1b1a18;
  --body: #625d5a;
  --muted: #8a817d;
  --quiet: #8a817d;
  --accent: #76577f;
  --line: rgba(50, 42, 39, 0.14);
  --page-x: clamp(34px, 4.4vw, 84px);
  --media-pan-x: 3vw;
}

* { box-sizing: border-box; }
html { min-width: 320px; overflow-x: clip; scroll-behavior: auto; background: var(--paper); }
body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  color: var(--ink);
  background: var(--paper);
  font-family: "Helvetica Neue", "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; color: inherit; }

.site-header {
  position: fixed;
  z-index: 60;
  inset: 0 0 auto;
  height: var(--header-h);
  padding: 0 var(--page-x);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid rgba(56, 48, 47, 0.09);
  background: rgba(247, 241, 237, 0.94);
  backdrop-filter: blur(12px);
  font-size: 13px;
  font-weight: 700;
}
.site-header a { text-decoration: none; }
.wordmark { justify-self: start; font-size: 16px; letter-spacing: -0.02em; }
.site-header nav { display: flex; gap: clamp(26px, 3vw, 48px); }
.site-header nav a { color: var(--quiet); }
.site-header nav a.is-current { color: var(--ink); }
.contact-link {
  justify-self: end;
  padding: 5px 0 7px;
  border-bottom: 1px solid var(--ink);
}

.story-shell { position: relative; }
.shared-media {
  position: sticky;
  z-index: 0;
  top: var(--header-h);
  width: 100%;
  height: calc(100svh - var(--header-h));
  overflow: hidden;
  background: var(--paper);
  pointer-events: none;
}
.shared-video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
  background: var(--paper);
  transform: translate3d(var(--media-pan-x), 0, 0);
  transform-origin: center;
  will-change: transform;
}
.media-fade {
  position: absolute;
  inset-block: 0;
  width: 58%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 260ms ease;
}
.shared-video-poster { position: absolute; inset: 0; }
video.shared-video { visibility: hidden; }
.shared-media[data-video-ready] video.shared-video { visibility: visible; }
.shared-media[data-video-ready] .shared-video-poster { visibility: hidden; }
.case-card-link {
  position: absolute;
  inset: 0;
  z-index: 2;
  border-radius: inherit;
  pointer-events: none;
}
.project-sheet.is-current-progress .case-card-link { pointer-events: auto; }
.case-card-link:focus-visible { outline: 3px solid var(--accent); outline-offset: -4px; }
@media (max-width: 760px), (prefers-reduced-motion: reduce) {
  .case-card-link { pointer-events: auto; }
}
.media-fade-left {
  left: 0;
  background: linear-gradient(90deg, var(--paper) 0 48%, rgba(247, 241, 237, 0.94) 61%, rgba(247, 241, 237, 0.34) 79%, transparent 100%);
}
.media-fade-right {
  right: 0;
  background: linear-gradient(270deg, var(--paper) 0 48%, rgba(247, 241, 237, 0.94) 61%, rgba(247, 241, 237, 0.34) 79%, transparent 100%);
}
body[data-active-frame="profile"] .media-fade-left,
body[data-active-frame="ability"] .media-fade-left,
body[data-active-frame="experience"] .media-fade-right { opacity: 1; }

.story-main {
  position: relative;
  z-index: 3;
  margin-top: calc(-100svh + var(--header-h));
  overflow: visible;
}
.story-frame {
  position: relative;
  min-height: 100svh;
  scroll-margin-top: var(--header-h);
  isolation: isolate;
}
/* 第一帧：保留 profile-frame-a-v0.1 的内容几何，只由共享媒体替代原独立视频。 */
.profile-frame {
  min-height: 100svh;
  overflow: hidden;
  background: transparent;
}
.profile-copy { z-index: 4; }
.scroll-cue { z-index: 4; }

/* 第二帧：直接沿用 ability-frame-a-v0.10 模块，不压缩为摘要板。 */
.ability-frame {
  min-height: 100svh;
  background: transparent;
}
.ability-frame .ability-stage {
  position: relative;
  z-index: 4;
}
.ability-frame #ability-groups::before {
  background: linear-gradient(108deg, rgba(255, 253, 251, 0.88) 0%, rgba(255, 253, 251, 0.80) 62%, rgba(250, 244, 240, 0.72) 82%, rgba(247, 241, 237, 0.12) 100%);
}
.ability-frame .ability-family:last-child .ability-entry:last-child {
  padding-bottom: 28px;
}

/* 第三帧：完整沿用 experience-frame-a-v0.8 的七段 disclosure。 */
.experience-frame {
  min-height: 100svh;
  background: transparent;
}
.experience-frame .experience-stage {
  position: relative;
  z-index: 4;
}
.experience-frame .experience-list { overflow: visible; }
.experience-frame .experience-item.is-open {
  background: rgba(250, 246, 243, 0.94);
}

/* 第四帧：沿用 case-frame-a-v0.3 的尺寸、间距与卡片内部结构。 */
.cases-frame {
  min-height: 100svh;
  overflow: visible;
  background: transparent;
}
.cases-frame .cases-intro,
.cases-frame .stack-track { position: relative; z-index: 4; }
.cases-frame .stack-viewport { overflow: visible; }
.project-sheet--ai .case-visual { overflow: hidden; }
.project-sheet--ai .case-visual img {
  width: 102.1%;
  max-width: none;
  transform: translateX(-1.03%);
}
@media (min-width: 1181px) {
  :root { --deck-w: min(60vw, 900px); }
}
.cases-frame .stack-end {
  width: 100%;
  /* 与 stack-viewport 的 24dvh 底边合成半屏退场，让 sticky 媒体在 pinEnd 附近自然释放。 */
  height: 26svh;
}

.site-footer {
  position: relative;
  z-index: 10;
  min-height: 112px;
  padding: 18px var(--page-x);
  display: grid;
  place-content: center;
  gap: 7px;
  border-top: 1px solid var(--line);
  color: var(--quiet);
  background: var(--paper);
  text-align: center;
  font-size: 13px;
}
.site-footer p { margin: 0; }
.filing-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px 20px; }
.filing-links a { color: inherit; text-decoration: none; }
.filing-links a:hover { color: var(--accent); }

@media (max-width: 760px) {
  :root { --header-h: 60px; --header-height: 60px; --page-x: 20px; }
  .site-header { grid-template-columns: 1fr auto; }
  .site-header nav { display: none; }
  .shared-media {
    position: absolute;
    top: var(--header-h);
    height: min(54dvh, 480px);
  }
  .shared-video { object-position: center top; opacity: 0.46; }
  .media-fade { width: 100%; opacity: 1 !important; background: linear-gradient(180deg, transparent 34%, var(--paper) 94%); }
  .story-main { margin-top: 0; }
  .profile-frame { padding-top: var(--header-h); overflow: visible; }
  .profile-copy { padding-top: 34px; }
  .ability-frame .ability-stage,
  .experience-frame .experience-stage { position: relative; }
  .cases-frame .stack-viewport { padding-bottom: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  .shared-media, .shared-video { will-change: auto; }
  .media-fade { transition: none; }
}

@media print {
  .shared-media, .site-header { display: none; }
  .story-main { margin-top: 0; }
  .story-frame { min-height: auto; }
}