/* ==========================================================================
   components.css — v4.0 WELCOME 启动条 / 顶栏(含进度线) / 按钮 / 十字光标
   ========================================================================== */

/* --------------------------------------------------------------------------
   WELCOME 启动条：词随进度左→右显影（clip-path 由 preloader 逐帧驱动）
   + 进度线同步 + 词尾光标块硬闪；JS 全挂时 CSS 7s 兜底隐没
   -------------------------------------------------------------------------- */
.splash {
  position: fixed;
  inset: 0;
  z-index: 520;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: splashFailsafe 0.4s var(--ease-out) 7s forwards;
}
@keyframes splashFailsafe {
  to { opacity: 0; visibility: hidden; }
}
.splash__stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.splash.is-open .splash__stage {
  opacity: 0;
  transform: translateY(-14px);
}
.splash__word {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 9vw, 5.6rem);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
  clip-path: inset(0 100% 0 0);
}
.splash__caret {
  width: 0.5em;
  height: 0.78em;
  margin-left: 0.08em;
  background: var(--accent);
  align-self: center;
  animation: caretBlink 1s step-end infinite;
}
@keyframes caretBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
.splash__bar {
  width: clamp(140px, 36vw, 200px);
  height: 4px;
  background: var(--line-soft);
  overflow: hidden;
}
.splash__bar i {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
}
.splash.is-gone {
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease-out), visibility 0s linear 0.4s;
}

/* --------------------------------------------------------------------------
   DOCK 栏：滚动 morph 的固定顶条（原顶栏位置）
   透明起步；--dock 驱动玻璃底浮现；槽位是克隆的着床目标（本身不可见）
   -------------------------------------------------------------------------- */
.dockbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 240;
  height: var(--nav-h);
  pointer-events: none;
}
.dockbar.is-active {
  background: color-mix(in srgb, var(--bg) calc(var(--dock) * 86%), transparent);
  -webkit-backdrop-filter: blur(calc(var(--dock) * 16px)) saturate(1.3);
  backdrop-filter: blur(calc(var(--dock) * 16px)) saturate(1.3);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--ink) calc(var(--dock) * 12%), transparent);
}
.dockbar.is-static.is-docked {
  background: var(--glass);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  backdrop-filter: blur(16px) saturate(1.3);
  box-shadow: 0 1px 0 var(--line-soft);
}
.dockbar__slot {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}
.dockbar__slot--l {
  left: var(--gutter);
  width: 44px;
  height: 44px;
}
.dockbar__slot--r {
  right: calc(var(--gutter) - 8px);
  display: flex;
  align-items: center;
}
.dockbar__ghost-name {
  visibility: hidden;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.9rem;
  letter-spacing: -0.03em;
  line-height: 1;
  white-space: nowrap;
  /* 光学校准旋钮：变换后的克隆字形盒比 em 盒偏上偏左，按实测补偿 */
  transform: translate(10px, 7px);
}
.dockbar__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* 原件退场：DOCK 激活时克隆同位接管，原件 0.25s 淡出（无交叉闪烁） */
.portrait,
.hero__title {
  transition: opacity 0.25s var(--ease-out);
}
.portrait.is-docking,
.hero__title.is-docking {
  opacity: 0;
}

/* 克隆：fixed 位姿由 effects 逐帧驱动；bootline/tag 在小尺寸下隐藏 */
.dockbar .dock-clone {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 242;
  transform-origin: 0 0;
  opacity: 0;
  pointer-events: none;
  will-change: transform;
  cursor: pointer;
}
.dockbar .dock-clone .portrait__tag {
  display: none;
}
.dockbar .dock-clone--p {
  border: 1px solid var(--line);
  background: var(--bg-2);
  overflow: hidden;
}
.dockbar .dock-clone--n {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.9rem;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
}

/* --------------------------------------------------------------------------
   章节头
   -------------------------------------------------------------------------- */
.sec-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-5);
}
.sec-head__left {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.sec-head__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  border: 1px solid var(--line);
  padding: 6px 8px;
  line-height: 1;
  transform: translateY(8px);
  transition: transform var(--dur-2) var(--spring), background-color var(--dur-1),
    color var(--dur-1);
}
.sec-head:hover .sec-head__num {
  transform: translateY(8px) rotate(-4deg);
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.sec-head__title {
  font-size: var(--step-3);
  font-weight: 800;
}
.sec-head__title .serif-italic {
  color: var(--accent);
}
.sec-head__en {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 0.6em;
  text-align: right;
}

/* --------------------------------------------------------------------------
   侧轨（桌面）
   -------------------------------------------------------------------------- */
.rail {
  display: none;
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.rail__track {
  width: 1px;
  height: 34vh;
  background: var(--line);
  position: relative;
}
.rail__thumb {
  position: absolute;
  left: -1px;
  width: 3px;
  height: 15%;
  background: var(--accent);
}
.rail__chapter {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--ink-3);
  writing-mode: vertical-rl;
}
.rail__chapter b {
  color: var(--accent);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   B 类显现：blur-rise（IO 触发后按自定速度播完，--d 级联）
   -------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(6px);
  transition: opacity var(--dur-2) var(--spring), transform var(--dur-2) var(--spring),
    filter var(--dur-2) var(--spring);
  transition-delay: var(--reveal-delay, 0s);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
  filter: blur(0);
}
[data-reveal="left"] {
  transform: translateX(-64px);
}
[data-reveal="right"] {
  transform: translateX(64px);
}

/* --------------------------------------------------------------------------
   十字光标 + 语境标签（RUN / OPEN / VISIT / TOP / BOOT / HELLO）
   仅 pointer:fine 时由 JS 挂载，触屏节点直接移除
   -------------------------------------------------------------------------- */
.cursor {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 420;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-1) linear;
}
.cursor.is-on { opacity: 1; }
.cursor__ring {
  position: absolute;
  width: 38px;
  height: 38px;
  transform: translate(-50%, -50%);
  transition: width var(--dur-1) var(--spring), height var(--dur-1) var(--spring);
}
.cursor__ring::before,
.cursor__ring::after {
  content: "";
  position: absolute;
  background: var(--accent);
}
.cursor__ring::before {
  left: 50%;
  top: -6px;
  width: 1px;
  height: 8px;
}
.cursor__ring::after {
  top: 50%;
  left: -6px;
  height: 1px;
  width: 8px;
}
.cursor__dot {
  position: absolute;
  width: 5px;
  height: 5px;
  background: var(--accent);
  transform: translate(-50%, -50%);
}
.cursor__label {
  position: absolute;
  top: 26px;
  left: 26px;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.22em;
  color: var(--accent-ink);
  background: var(--accent);
  padding: 3px 8px;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--dur-1) var(--ease-out), transform var(--dur-1) var(--spring);
}
.cursor.has-label .cursor__label {
  opacity: 1;
  transform: none;
}
.cursor.is-link .cursor__ring {
  width: 62px;
  height: 62px;
}
.cursor.is-link .cursor__ring::before {
  height: 12px;
}
.cursor.is-link .cursor__ring::after {
  width: 12px;
}