/* 太极首页视频叠层入口 + Playback
 *
 * 顶栏 / 页脚：保留站点壳；主区单栏视频 + 叠层文案。
 * 中栏：媒体 height 优先 + object-fit: contain；阴影锚定媒体真实边界。
 * 文案：叠在视频真实边界内 — 阴（书斋）左上，阳（工坊）右下。
 * 状态机：data-mode × data-phase（app.js 不改逻辑）
 */

#page-home.is-ink-home-full {
  --ink-paper-tone: #beb29d;
}

#page-home.is-ink-home-full.active-page {
  animation: none;
}

body:has(#page-home.is-ink-home-full.active-page:not([hidden])) {
  background-color: var(--ink-paper-tone);
}

body:has(#page-home.is-ink-home-full.active-page:not([hidden])) .app-wrapper {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

body:has(#page-home.is-ink-home-full.active-page:not([hidden])) .main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  max-width: none;
  margin: 0;
  padding: 0;
  background: transparent;
}

body:has(#page-home.is-ink-home-full.active-page:not([hidden])) .bottom-nav,
body:has(#page-home.is-ink-home-full.active-page:not([hidden])) .back-to-top {
  display: none;
}

#page-home.is-ink-home-full {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background-color: var(--ink-paper-tone);
}

#page-home.is-ink-home-full .ink-home {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: min(28rem, calc(100dvh - 11rem));
  margin: 0;
  padding: 0;
  width: 100%;
  box-sizing: border-box;
  background-color: var(--ink-paper-tone);
}

#page-home.is-ink-home-full .ink-taiji {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  min-height: 0;
  width: 100%;
  margin: 0;
}

/* —— 视频叠层：主标题 + 副标题（锚定 media inset）—— */
.ink-taiji__viewport .ink-home__lane {
  position: absolute;
  z-index: 5;
  display: flex;
  flex-direction: column;
  gap: clamp(0.65rem, 2vh, 1.15rem);
  padding: clamp(0.5rem, 1.4vh, 0.85rem);
  box-sizing: border-box;
  max-width: min(44%, 13rem);
  background: transparent;
  pointer-events: none;
}

.ink-taiji__viewport .ink-home__lane--yin {
  top: var(--ink-media-inset-top, 0);
  left: var(--ink-media-inset-left, 0);
  align-items: flex-start;
  justify-content: flex-start;
}

.ink-taiji__viewport .ink-home__lane--yang {
  bottom: var(--ink-media-inset-bottom, 0);
  right: var(--ink-media-inset-right, 0);
  align-items: flex-end;
  justify-content: flex-end;
}

@media (min-width: 721px) {
  .ink-taiji__viewport .ink-home__lane--yin {
    top: calc(var(--ink-media-inset-top, 0) + clamp(1.9rem, 8.5vh, 4.8rem) + 1em);
    left: calc(var(--ink-media-inset-left, 0) + clamp(1rem, 2.8vw, 2.2rem) + 2em);
  }

  .ink-taiji__viewport .ink-home__lane--yang {
    bottom: calc(var(--ink-media-inset-bottom, 0) + clamp(1.8rem, 8vh, 4.6rem) + 1em);
    right: calc(var(--ink-media-inset-right, 0) + clamp(1rem, 2.8vw, 2.2rem) + 2em);
  }
}

.ink-taiji__viewport .ink-home__copy-main {
  pointer-events: none;
}

.ink-taiji__viewport .ink-home__entry {
  position: relative;
  z-index: 6;
}

.ink-home__copy-main {
  margin: 0;
  padding: 0.4rem 0.16rem;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.2rem, 1.35rem);
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink);
  text-align: center;
  --ink-corner-color: rgba(26, 20, 16, 0.34);
  --ink-corner-size-h: 0.9rem;
  --ink-corner-size-v: 0.56rem;
  --ink-corner-thickness: 2px;
  background:
    linear-gradient(var(--ink-corner-color), var(--ink-corner-color)) left top /
      var(--ink-corner-size-h) var(--ink-corner-thickness) no-repeat,
    linear-gradient(var(--ink-corner-color), var(--ink-corner-color)) left top /
      var(--ink-corner-thickness) var(--ink-corner-size-v) no-repeat,
    linear-gradient(var(--ink-corner-color), var(--ink-corner-color)) right bottom /
      var(--ink-corner-size-h) var(--ink-corner-thickness) no-repeat,
    linear-gradient(var(--ink-corner-color), var(--ink-corner-color)) right bottom /
      var(--ink-corner-thickness) var(--ink-corner-size-v) no-repeat;
}

.ink-home__entry {
  margin: 0;
  padding: 0.35rem 0.15rem;
  border: none;
  background: transparent;
  cursor: pointer;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: clamp(0.8rem, 0.9rem, 1rem);
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--ink-2);
  text-decoration: none;
  transition:
    color 0.2s ease,
    opacity 0.3s cubic-bezier(0.22, 0.76, 0.24, 1),
    transform 0.34s cubic-bezier(0.22, 0.76, 0.24, 1),
    filter 0.28s ease,
    visibility 0s linear 0.34s;
}

.ink-home__entry:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.ink-home__entry:focus-visible {
  outline: 2px solid rgba(26, 20, 16, 0.35);
  outline-offset: 3px;
}

/* —— 桌面端：半区悬停切换副标题（主标题常显）—— */
@media (min-width: 721px) {
  .ink-taiji__viewport .ink-home__lane--yang {
    flex-direction: column-reverse;
  }

  .ink-taiji .ink-home__entry {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    filter: blur(0.6px);
  }

  .ink-home__lane--yin .ink-home__entry {
    transform: translateY(-0.45rem) scale(0.985);
    transform-origin: 50% 100%;
  }

  .ink-home__lane--yang .ink-home__entry {
    transform: translateY(0.45rem) scale(0.985);
    transform-origin: 50% 0%;
  }

  /* 默认（none）与左侧命中：显示“进入书斋” */
  .ink-taiji[data-ink-hover="none"] .ink-home__lane--yin .ink-home__entry,
  .ink-taiji[data-ink-hover="yin"] .ink-home__lane--yin .ink-home__entry {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    filter: none;
    transform: translateY(0) scale(1);
    transition-delay: 40ms, 40ms, 40ms, 40ms, 0s;
  }

  /* 右侧命中：显示“进入工坊” */
  .ink-taiji[data-ink-hover="yang"] .ink-home__lane--yang .ink-home__entry {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    filter: none;
    transform: translateY(0) scale(1);
    transition-delay: 40ms, 40ms, 40ms, 40ms, 0s;
  }
}

/* —— 中栏：动画按高度 contain —— */
.ink-taiji__viewport {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  align-self: stretch;
  background-color: var(--ink-paper-tone);
  isolation: isolate;
}

.ink-taiji__viewport .ink-taiji__backdrop,
.ink-taiji__viewport .ink-taiji__playback,
.ink-taiji__viewport .ink-taiji__formed {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  pointer-events: none;
}

.ink-taiji__viewport .ink-taiji__backdrop {
  z-index: 0;
}

.ink-taiji__viewport .ink-taiji__playback {
  z-index: 1;
  display: block;
}

.ink-taiji__viewport .ink-taiji__formed {
  z-index: 2;
  user-select: none;
}

/* —— 半区命中 + 悬停叠层（INK-TAIJI-INTERACTION Step 2–3）—— */
.ink-taiji__hits {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: row;
  margin: 0;
  padding: 0;
  border: none;
  pointer-events: none;
  touch-action: manipulation;
}

.ink-taiji__hits[hidden] {
  display: none;
}

.ink-taiji__hit {
  flex: 0 0 50%;
  width: 50%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  /* 默认不展示 debug 轮廓；仅 focus-visible 时给出可访问描边 */
  outline: 1px solid transparent;
  outline-offset: -1px;
  touch-action: manipulation;
}

.ink-taiji__hit:focus-visible {
  outline: 2px solid rgba(26, 20, 16, 0.4);
  outline-offset: 2px;
}

.ink-taiji[data-mode="play"][data-phase="idle"] .ink-taiji__hits:not([hidden]),
.ink-taiji[data-mode="static"] .ink-taiji__hits:not([hidden]) {
  pointer-events: auto;
}

/* 分半明暗：viewport 叠层，不用全层 blur */
.ink-taiji__viewport::before,
.ink-taiji__viewport::after {
  content: "";
  position: absolute;
  inset:
    var(--ink-media-inset-top, 0)
    var(--ink-media-inset-right, 0)
    var(--ink-media-inset-bottom, 0)
    var(--ink-media-inset-left, 0);
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.22s ease;
}

.ink-taiji__viewport[data-ink-hover="yin"]::before,
.ink-taiji__viewport[data-ink-hover="yang"]::before {
  opacity: 1;
}

.ink-taiji__viewport[data-ink-hover="yin"]::before {
  background: linear-gradient(
    to right,
    rgba(255, 252, 245, 0.11) 0%,
    rgba(255, 252, 245, 0.11) 50%,
    rgba(12, 10, 8, 0.13) 50%,
    rgba(12, 10, 8, 0.13) 100%
  );
}

.ink-taiji__viewport[data-ink-hover="yang"]::before {
  background: linear-gradient(
    to right,
    rgba(12, 10, 8, 0.13) 0%,
    rgba(12, 10, 8, 0.13) 50%,
    rgba(255, 252, 245, 0.11) 50%,
    rgba(255, 252, 245, 0.11) 100%
  );
}

/* 克制墨韵：仅悬停半区（mask 分半） */
.ink-taiji__viewport[data-ink-hover="yin"]::after,
.ink-taiji__viewport[data-ink-hover="yang"]::after {
  opacity: 1;
  background: linear-gradient(
    108deg,
    transparent 0%,
    rgba(26, 20, 16, 0.05) 38%,
    rgba(26, 20, 16, 0.09) 50%,
    rgba(26, 20, 16, 0.05) 62%,
    transparent 100%
  );
  background-size: 220% 220%;
  animation: inkVeilDrift 5.5s ease-in-out infinite;
}

.ink-taiji__viewport[data-ink-hover="yin"]::after {
  -webkit-mask-image: linear-gradient(to right, #000 0%, #000 50%, transparent 50%);
  mask-image: linear-gradient(to right, #000 0%, #000 50%, transparent 50%);
}

.ink-taiji__viewport[data-ink-hover="yang"]::after {
  -webkit-mask-image: linear-gradient(to right, transparent 50%, #000 50%, #000 100%);
  mask-image: linear-gradient(to right, transparent 50%, #000 50%, #000 100%);
}

@keyframes inkVeilDrift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* —— play · intro —— */
.ink-taiji[data-mode="play"][data-phase="intro"] .ink-taiji__backdrop {
  visibility: visible;
  opacity: 1;
}

.ink-taiji[data-mode="play"][data-phase="intro"] .ink-taiji__playback {
  visibility: visible;
  opacity: 1;
}

.ink-taiji[data-mode="play"][data-phase="intro"] .ink-taiji__formed {
  visibility: visible;
  opacity: 0;
}

/* —— play · handoff —— */
.ink-taiji[data-mode="play"][data-phase="handoff"] .ink-taiji__backdrop {
  visibility: visible;
  opacity: 1;
}

.ink-taiji[data-mode="play"][data-phase="handoff"] .ink-taiji__playback {
  visibility: visible;
  opacity: 0;
  transition: opacity 0.35s ease-out;
}

.ink-taiji[data-mode="play"][data-phase="handoff"] .ink-taiji__formed {
  visibility: visible;
  opacity: 1;
  transition: opacity 0.35s ease-out;
}

/* —— play · idle —— */
.ink-taiji[data-mode="play"][data-phase="idle"] .ink-taiji__backdrop {
  visibility: hidden;
  opacity: 0;
}

.ink-taiji[data-mode="play"][data-phase="idle"] .ink-taiji__playback {
  visibility: hidden;
  opacity: 0;
}

.ink-taiji[data-mode="play"][data-phase="idle"] .ink-taiji__formed {
  visibility: visible;
  opacity: 1;
  animation: inkBreathe 7s ease-in-out infinite;
}

/* —— static —— */
.ink-taiji[data-mode="static"] .ink-taiji__backdrop {
  visibility: hidden;
  opacity: 0;
}

.ink-taiji[data-mode="static"] .ink-taiji__playback {
  visibility: hidden;
  opacity: 0;
}

.ink-taiji[data-mode="static"] .ink-taiji__formed {
  visibility: visible;
  opacity: 1;
  animation: none;
  filter: none;
}

@keyframes inkBreathe {
  0%,
  100% {
    filter: brightness(1);
  }
  50% {
    filter: brightness(0.97);
  }
}

@media (max-width: 720px) {
  #page-home.is-ink-home-full .ink-home {
    flex: 1;
    min-height: 0;
  }

  #page-home.is-ink-home-full .ink-taiji {
    flex: 1;
    min-height: 0;
    width: 100%;
  }

  .ink-taiji__viewport {
    flex: 1 1 auto;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    min-height: 0;
  }

  .ink-taiji__viewport .ink-taiji__backdrop,
  .ink-taiji__viewport .ink-taiji__playback,
  .ink-taiji__viewport .ink-taiji__formed {
    object-fit: cover;
    object-position: center;
  }

  .ink-taiji__viewport .ink-home__lane {
    max-width: min(52%, 11.5rem);
    padding: 0.4rem 0.55rem;
    gap: 0.4rem;
  }

  .ink-taiji__viewport .ink-home__lane--yin {
    flex-direction: column;
    align-items: flex-start;
  }

  .ink-taiji__viewport .ink-home__lane--yang {
    flex-direction: column-reverse;
    align-items: flex-end;
  }

  .ink-home__copy-main {
    margin: 0;
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: clamp(0.9rem, 0.98rem, 1rem);
    letter-spacing: 0.14em;
    writing-mode: horizontal-tb;
    text-orientation: initial;
    padding: 0.32rem 0.6rem;
    --ink-corner-size-h: 0.76rem;
    --ink-corner-size-v: 0.5rem;
    --ink-corner-thickness: 1.8px;
  }

  /* 移动端：主副标题常显，两套入口都可点（不受桌面 hover 规则影响） */
  .ink-taiji .ink-home__entry {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    filter: none;
    transform: none;
    flex: 0 0 auto;
    white-space: nowrap;
    font-size: clamp(0.76rem, 0.82rem, 0.88rem);
    writing-mode: horizontal-tb;
    text-orientation: initial;
    padding: 0.35rem 0.75rem;
    transition: color 0.2s ease;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ink-home__entry {
    transition: color 0.2s ease !important;
    transform: none !important;
    filter: none !important;
  }

  .ink-taiji__playback,
  .ink-taiji__formed {
    transition: none !important;
  }

  .ink-taiji[data-mode="play"][data-phase="idle"] .ink-taiji__formed {
    animation: none;
  }

  .ink-taiji .ink-taiji__backdrop,
  .ink-taiji .ink-taiji__playback {
    visibility: hidden;
    opacity: 0;
  }

  .ink-taiji .ink-taiji__formed {
    visibility: visible;
    opacity: 1;
  }

  .ink-taiji__viewport[data-ink-hover="yin"]::after,
  .ink-taiji__viewport[data-ink-hover="yang"]::after {
    animation: none;
    background-position: 50% 50%;
  }
}