/* =========================================================================
   云鲸归途 · CLOUDWHALE VOYAGE — 开始菜单样式
   结构：变量 → 基础 → 场景图层 → 标题 → 菜单 → 面板/设置 → 全屏画面 → 载入
         → 进场动画 → 减少动态 → 响应式
   ========================================================================= */

:root {
  --ink: #0b0818;
  --cream: #fbefdc;
  --gold: #f2c98a;
  --gold-soft: rgba(242, 201, 138, .38);
  --lantern: #ffbf66;
  --text: rgba(250, 238, 222, .86);
  --panel-bg-top: rgba(36, 25, 64, .93);
  --panel-bg-bot: rgba(19, 13, 38, .95);

  /* 系统字体栈（零外部字体） */
  --font-cn: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Noto Serif CJK SC",
             "Songti SC", "STSong", "STZhongsong", "SimSun", serif;
  --font-latin: "Palatino Linotype", "Book Antiqua", Palatino, "URW Palladio L", "Cambria", Georgia, serif;

  /* 进场时间轴（ms） */
  --t-title: 3000ms;
  --t-menu: 3900ms;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-cn);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.app {
  position: fixed;
  inset: 0;
  overflow: hidden;
  user-select: none;
}

/* =========================================================================
   场景
   ========================================================================= */
.scene {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: var(--ink);
  isolation: isolate;          /* screen 混合只在场景内部计算 */
}

.layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.9s ease var(--delay, 0ms);
}
.layer__move {                 /* JS：视差位移 */
  position: absolute;
  inset: 0;
  will-change: transform;
}
.layer__box {                  /* JS：位置与尺寸；CSS：自身动画 */
  position: absolute;
}
.layer__box > img {
  display: block;
  width: 100%;
  height: 100%;
  -webkit-user-drag: none;
}
.layer__strip {                /* 无缝横向循环的云带 */
  position: absolute;
  background-repeat: repeat-x;
  background-position: 0 0;
  will-change: transform;
}

/* 鲸：缓慢上下浮动 + 极轻微的旋转 + 微弱前后漂移（三个独立属性，周期互质） */
.layer--whale .layer__box {
  transform-origin: 46% 58%;
  animation:
    whale-bob 8.5s ease-in-out infinite alternate,
    whale-roll 12.5s ease-in-out infinite alternate,
    whale-drift 21s ease-in-out infinite alternate;
}
@keyframes whale-bob   { from { translate: 0 -1.9%; } to { translate: 0 2.1%; } }
@keyframes whale-roll  { from { rotate: -0.75deg; }  to { rotate: 0.65deg; } }
@keyframes whale-drift { from { transform: translateX(-0.7%); } to { transform: translateX(0.7%); } }

/* 光层：呼吸式明暗 */
.layer--light .layer__box { animation: breathe 7.5s ease-in-out infinite alternate; }
@keyframes breathe { from { opacity: .45; } to { opacity: 1; } }

/* 图层上的暖光点（旅人灯笼、鲸背窗灯），坐标见 scene-config.js 的 glows */
.glow {
  position: absolute;
  aspect-ratio: 1;
  translate: -50% -50%;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, rgba(255, 226, 160, .62) 0%, rgba(255, 178, 92, .26) 32%, rgba(255, 150, 80, 0) 70%);
  mix-blend-mode: screen;
}
.glow--lantern { animation: lantern-flicker 2.7s steps(1, end) infinite, lantern-breathe 5s ease-in-out infinite alternate; }
.glow--twinkle {
  background: radial-gradient(circle, rgba(255, 236, 180, .9) 0%, rgba(255, 190, 100, .35) 30%, rgba(255, 160, 80, 0) 70%);
  animation: twinkle var(--dur, 3.6s) ease-in-out var(--del, 0s) infinite alternate;
}
@keyframes lantern-flicker {
  0% { opacity: 1; } 12% { opacity: .86; } 19% { opacity: 1; } 47% { opacity: .92; }
  53% { opacity: 1; } 71% { opacity: .8; } 76% { opacity: .97; } 100% { opacity: 1; }
}
@keyframes lantern-breathe { from { scale: .92; } to { scale: 1.08; } }
@keyframes twinkle { from { opacity: .15; scale: .7; } to { opacity: 1; scale: 1.1; } }

.particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 20;
  pointer-events: none;
  opacity: 0;
  transition: opacity 2.5s ease 2600ms;
}

/* 轻微的色彩统一：顶部压暗一点、地平线带一点暖色 */
.scene-tint {
  position: absolute;
  inset: 0;
  z-index: 21;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(10, 8, 34, .28) 0%, rgba(10, 8, 34, 0) 30%),
    radial-gradient(ellipse 70% 30% at 30% 62%, rgba(255, 160, 100, .10), rgba(255, 160, 100, 0) 70%);
}
.vignette {
  position: absolute;
  inset: 0;
  z-index: 22;
  pointer-events: none;
  background: radial-gradient(ellipse 85% 85% at 45% 45%, rgba(8, 5, 20, 0) 55%, rgba(8, 5, 20, .55) 100%);
}

/* 右侧文字背后的柔和暗角 */
.ui-scrim {
  position: absolute;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background:
    radial-gradient(ellipse 22% 34% at 81% 72%, rgba(16, 10, 38, .42) 0%, rgba(16, 10, 38, 0) 100%),
    radial-gradient(ellipse 30% 62% at 80.5% 52%, rgba(14, 9, 34, .52) 0%, rgba(14, 9, 34, .24) 55%, rgba(14, 9, 34, 0) 100%);
  opacity: 0;
  transition: opacity 2s ease 2600ms;
}

/* =========================================================================
   UI 列：标题 + 菜单
   ========================================================================= */
.ui {
  position: absolute;
  inset: 0;
  z-index: 10;
}
.ui-column {
  position: absolute;
  top: 0;
  bottom: 0;
  right: clamp(16px, 3.6vw, 96px);
  width: clamp(300px, 31vw, 620px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 4.6vh, 64px);
  padding: 5vh 0 6vh;
}

/* ---------- 标题区 ---------- */
.title-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.emblem-wrap {
  display: block;
  animation: emblem-float 6.5s ease-in-out infinite alternate;
}
.emblem {
  display: block;
  height: clamp(92px, 21vh, 250px);
  width: auto;
  filter:
    drop-shadow(0 0 1.4vh rgba(255, 196, 120, .38))
    drop-shadow(0 .8vh 1.2vh rgba(10, 5, 25, .55));
  -webkit-user-drag: none;
}
@keyframes emblem-float { from { translate: 0 -0.5vh; } to { translate: 0 0.5vh; } }

.title {
  position: relative;
  margin: 1.4vh 0 0;
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(40px, min(10.4vh, 5.6vw), 132px);
  line-height: 1.12;
  letter-spacing: .16em;
  padding-left: .16em;              /* 抵消末字后的字距，使视觉居中 */
  white-space: nowrap;
}
.title > span { display: block; }
.title__glow,
.title__stroke,
.title__sheen {
  position: absolute;
  inset: 0;
  padding-left: inherit;
}
.title__glow {
  color: transparent;
  text-shadow:
    0 0 .3em rgba(255, 176, 96, .55),
    0 0 .9em rgba(255, 140, 100, .32);
}
.title__stroke {
  color: transparent;
  -webkit-text-stroke: .085em rgba(34, 18, 50, .78);
}
.title__fill {
  position: relative;
  color: transparent;
  background: linear-gradient(178deg, #fffbf2 6%, #ffeac0 36%, #f5bd76 66%, #da8c5c 94%);
  -webkit-background-clip: text;
  background-clip: text;
}
.title__sheen {
  color: transparent;
  background: linear-gradient(105deg, rgba(255, 255, 255, 0) 42%, rgba(255, 250, 235, .85) 50%, rgba(255, 255, 255, 0) 58%);
  background-size: 260% 100%;
  background-repeat: no-repeat;
  background-position: 160% 0;
  -webkit-background-clip: text;
  background-clip: text;
  animation: sheen 9s ease-in-out 6s infinite;
}
@keyframes sheen {
  0%   { background-position: 160% 0; }
  22%  { background-position: -60% 0; }
  100% { background-position: -60% 0; }
}

.title-divider {
  position: relative;
  width: 62%;
  height: 1px;
  margin: 1.5vh auto 0;
  background: linear-gradient(90deg, rgba(244, 206, 150, 0), rgba(244, 206, 150, .85) 28%, rgba(244, 206, 150, .85) 72%, rgba(244, 206, 150, 0));
}
.title-divider > i {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border: 1px solid #f4ce96;
  background: #2a1b3e;
  transform: translate(-50%, -50%) rotate(45deg);
  box-shadow: 0 0 8px rgba(255, 190, 110, .75);
}
.subtitle {
  margin: 1.3vh 0 0;
  font-family: var(--font-latin);
  font-size: clamp(11px, 2vh, 21px);
  letter-spacing: .62em;
  padding-left: .62em;
  color: #f4dcbc;
  white-space: nowrap;
  text-shadow: 0 0 10px rgba(255, 180, 110, .45), 0 1px 2px rgba(10, 5, 25, .85);
}

/* ---------- 菜单 ---------- */
.whale-slot { display: none; }

.menu {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  --menu-fs: clamp(17px, min(3.15vh, 2.1vw), 33px);
  font-size: var(--menu-fs);
}
.menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(0px, .5vh, 8px);
}
.menu-item {
  appearance: none;
  position: relative;
  display: block;
  margin: 0;
  padding: .42em 1.6em .52em;
  border: 0;
  background: none;
  cursor: pointer;
  outline: none;
  font-family: var(--font-cn);
  font-size: 1em;
  font-weight: 500;
  letter-spacing: .42em;
  text-indent: .42em;
  line-height: 1.3;
  color: var(--text);
  text-shadow: 0 1px 3px rgba(8, 4, 20, .9), 0 0 .7em rgba(22, 12, 48, .75);
  transition: color .35s ease, text-shadow .35s ease, transform .45s cubic-bezier(.2, .8, .2, 1);
}
.menu-item::before {           /* 选中光晕 */
  content: "";
  position: absolute;
  inset: 4% -14%;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(ellipse 50% 50% at 50% 50%, rgba(255, 190, 110, .30), rgba(255, 190, 110, 0) 72%);
  opacity: 0;
  transform: scaleX(.55);
  transition: opacity .45s ease, transform .55s cubic-bezier(.2, .8, .2, 1);
}
.menu-item__label { display: block; }
.menu-item__sub {              /* 选中时浮现的英文小字 */
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.12em;
  font-family: var(--font-latin);
  font-size: .34em;
  letter-spacing: .55em;
  text-indent: .55em;
  color: #f2cf98;
  opacity: 0;
  transform: translateY(-.3em);
  transition: opacity .35s ease, transform .45s ease;
  white-space: nowrap;
}
.menu-item__tag { display: none; }

.menu-item.is-selected {
  color: #fff5de;
  text-shadow: 0 0 .5em rgba(255, 190, 110, .8), 0 0 .08em rgba(255, 236, 200, .9), 0 1px 3px rgba(8, 4, 20, .6);
  transform: scale(1.07);
}
.menu-item.is-selected::before { opacity: 1; transform: scaleX(1); }
.menu-item.is-selected .menu-item__sub { opacity: .8; transform: none; }

.menu-item:disabled {
  cursor: not-allowed;
  color: rgba(222, 212, 204, .3);
  text-shadow: none;
}
.menu-item:disabled .menu-item__tag {
  display: inline-block;
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translate(-.6em, -50%);
  padding: .2em .7em;
  border: 1px solid rgba(240, 225, 210, .22);
  border-radius: 999px;
  font-size: .4em;
  letter-spacing: .2em;
  text-indent: .2em;
  color: rgba(240, 225, 210, .42);
  white-space: nowrap;
}

/* 选中指示：小灯笼，跟随选中项滑动并轻轻摇晃 */
.menu-indicator {
  position: absolute;
  left: 0;
  top: 0;
  width: .8em;
  height: 1.46em;
  opacity: 0;
  pointer-events: none;
  transition: transform .5s cubic-bezier(.3, .85, .3, 1), opacity .4s ease;
}
.menu.has-selection .menu-indicator { opacity: 1; }
.lantern-icon {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  transform-origin: 50% 0;
  animation: lantern-sway 3.4s ease-in-out infinite alternate;
  filter: drop-shadow(0 0 4px rgba(255, 196, 110, .95)) drop-shadow(0 0 12px rgba(255, 150, 80, .6));
}
@keyframes lantern-sway { from { rotate: -7deg; } to { rotate: 7deg; } }

.key-hints {
  position: absolute;
  right: clamp(16px, 3.6vw, 96px);
  width: clamp(300px, 31vw, 620px);
  bottom: 2.4vh;
  margin: 0;
  text-align: center;
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(240, 226, 210, .5);
  text-shadow: 0 1px 2px rgba(0, 0, 0, .6);
}
kbd {
  display: inline-block;
  min-width: 1.7em;
  margin: 0 .15em;
  padding: .05em .4em;
  border: 1px solid rgba(240, 220, 190, .3);
  border-radius: 4px;
  font-family: var(--font-latin);
  font-size: .95em;
  text-align: center;
  color: rgba(250, 236, 214, .72);
  background: rgba(20, 12, 40, .35);
}

/* =========================================================================
   面板（设置 / 制作人员 / 退出确认）
   ========================================================================= */
.panel {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 4vh 4vw;
  background: rgba(8, 5, 20, .5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity .35s ease;
}
.panel.is-open { opacity: 1; }
.panel__box {
  position: relative;
  width: min(560px, 100%);
  max-height: 92vh;
  overflow: auto;
  padding: 30px 38px 26px;
  border: 1px solid var(--gold-soft);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--panel-bg-top), var(--panel-bg-bot));
  box-shadow:
    0 30px 80px rgba(0, 0, 0, .55),
    inset 0 1px 0 rgba(255, 230, 190, .12),
    0 0 40px rgba(255, 170, 90, .08);
  transform: translateY(14px) scale(.98);
  transition: transform .45s cubic-bezier(.2, .8, .2, 1);
}
.panel__box::before {          /* 内描边 */
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(242, 201, 138, .12);
  border-radius: 13px;
  pointer-events: none;
}
.panel.is-open .panel__box { transform: none; }
.panel__box--small { width: min(440px, 100%); text-align: center; }
.panel__title {
  margin: 0 0 20px;
  text-align: center;
  font-size: 25px;
  font-weight: 700;
  letter-spacing: .32em;
  text-indent: .32em;
  color: #ffe7c0;
  text-shadow: 0 0 12px rgba(255, 180, 100, .35);
}
.panel__title small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-latin);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .5em;
  text-indent: .5em;
  color: rgba(240, 210, 170, .55);
}
.panel__note {
  margin: 16px 4px 0;
  font-size: 12.5px;
  line-height: 1.7;
  text-align: center;
  color: rgba(240, 225, 205, .5);
}
.panel__actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
}
.panel__actions--center { justify-content: center; }

.btn {
  appearance: none;
  padding: 10px 26px;
  border: 1px solid rgba(242, 201, 138, .55);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(246, 195, 122, .22), rgba(246, 195, 122, .07));
  color: #ffeccc;
  font-family: var(--font-cn);
  font-size: 16px;
  letter-spacing: .25em;
  text-indent: .25em;
  cursor: pointer;
  outline: none;
  transition: background .25s ease, box-shadow .25s ease, color .25s ease, border-color .25s ease;
}
.btn:hover,
.btn:focus-visible {
  background: linear-gradient(180deg, rgba(246, 195, 122, .42), rgba(246, 195, 122, .16));
  box-shadow: 0 0 18px rgba(255, 190, 110, .38);
}
.btn:focus-visible { box-shadow: 0 0 0 2px rgba(255, 220, 160, .55), 0 0 18px rgba(255, 190, 110, .4); }
.btn--ghost {
  border-color: rgba(240, 225, 210, .26);
  background: transparent;
  color: rgba(240, 225, 210, .78);
}
.btn:disabled { opacity: .35; cursor: default; box-shadow: none; }

/* ---------- 设置项 ---------- */
.settings-list { display: flex; flex-direction: column; gap: 4px; }
.setting {
  display: grid;
  grid-template-columns: 5.6em 1fr 2.6em;
  align-items: center;
  gap: 18px;
  padding: 11px 14px;
  border-radius: 10px;
  transition: background .25s ease, box-shadow .25s ease;
}
.setting:focus-within {
  background: rgba(255, 200, 130, .08);
  box-shadow: inset 0 0 0 1px rgba(255, 200, 130, .24);
}
.setting__label { font-size: 17px; letter-spacing: .2em; color: #f5e6d0; }
.setting__value {
  text-align: right;
  font-family: var(--font-latin);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  color: rgba(245, 225, 200, .75);
}
.setting--toggle .setting__value { font-family: var(--font-cn); }

.slider {
  --p: 50%;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 24px;
  margin: 0;
  background: transparent;
  cursor: pointer;
  outline: none;
}
.slider::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, #f6c37a 0, #ef9a6a var(--p), rgba(255, 255, 255, .14) var(--p));
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin-top: -7px;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #fff8e6, #f6c37a 55%, #c9773f);
  box-shadow: 0 0 0 3px rgba(255, 200, 130, .18), 0 0 12px rgba(255, 180, 100, .6);
  transition: box-shadow .2s ease;
}
.slider:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 5px rgba(255, 214, 150, .4), 0 0 16px rgba(255, 180, 100, .85); }
.slider::-moz-range-track { height: 4px; border-radius: 4px; background: rgba(255, 255, 255, .14); }
.slider::-moz-range-progress { height: 4px; border-radius: 4px; background: linear-gradient(90deg, #f6c37a, #ef9a6a); }
.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #fff8e6, #f6c37a 55%, #c9773f);
  box-shadow: 0 0 0 3px rgba(255, 200, 130, .18), 0 0 12px rgba(255, 180, 100, .6);
}

.switch {
  position: relative;
  justify-self: start;
  width: 52px;
  height: 28px;
  padding: 0;
  border: 1px solid rgba(242, 201, 138, .4);
  border-radius: 999px;
  background: rgba(255, 255, 255, .08);
  cursor: pointer;
  outline: none;
  transition: background .3s ease, box-shadow .25s ease;
}
.switch__knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #d9ccbd;
  transition: transform .3s cubic-bezier(.3, .8, .3, 1), background .3s ease, box-shadow .3s ease;
}
.switch[aria-checked="true"] { background: linear-gradient(90deg, #ee9f68, #f6c37a); }
.switch[aria-checked="true"] .switch__knob {
  transform: translateX(24px);
  background: #fff8ea;
  box-shadow: 0 0 10px rgba(255, 200, 120, .85);
}
.switch:focus-visible { box-shadow: 0 0 0 3px rgba(255, 214, 150, .45); }

/* ---------- 制作人员滚动字幕 ---------- */
.panel__box--credits { width: min(520px, 100%); }
.credits-viewport {
  position: relative;
  height: min(48vh, 400px);
  overflow: hidden;
  outline: none;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 16%, #000 84%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0, #000 16%, #000 84%, transparent 100%);
}
.credits-roll {
  --roll-from: min(48vh, 400px);
  text-align: center;
  animation: credits-roll 30s linear infinite;
}
.credits-viewport:hover .credits-roll { animation-play-state: paused; }
@keyframes credits-roll {
  from { transform: translateY(var(--roll-from)); }
  to   { transform: translateY(-100%); }
}
.credits-head {
  margin: 0;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: .25em;
  text-indent: .25em;
  color: #ffe2b0;
  text-shadow: 0 0 14px rgba(255, 180, 100, .5);
}
.credits-en {
  margin: 6px 0 18px;
  font-family: var(--font-latin);
  font-size: 12px;
  letter-spacing: .5em;
  text-indent: .5em;
  color: rgba(240, 210, 170, .6);
}
.credits-roll dl { margin: 0; }
.credits-roll dt {
  margin-top: 24px;
  font-size: 12.5px;
  letter-spacing: .32em;
  text-indent: .32em;
  color: rgba(240, 205, 160, .62);
}
.credits-roll dd {
  margin: 7px 0 0;
  font-size: 18px;
  letter-spacing: .12em;
  color: #fbeedc;
}
.credits-end {
  margin: 44px 0 10px;
  font-size: 15px;
  letter-spacing: .25em;
  color: #f6cf98;
}

.dialog-text {
  margin: 4px 0 6px;
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .08em;
  color: rgba(248, 234, 214, .85);
}

/* =========================================================================
   全屏画面（旅程即将开始 / 感谢游玩）
   ========================================================================= */
.screen {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  background: #04030a;
  opacity: 0;
  transition: opacity 1.3s ease;
}
.screen.is-open { opacity: 1; }
.screen--thanks { background: radial-gradient(ellipse 70% 60% at 50% 58%, #1e1438 0%, #0a0716 55%, #04030a 100%); }
.screen__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 6vw;
}
.screen__lantern,
.loader__lantern {
  width: 16px;
  height: 21px;
  margin-bottom: 30px;
  border-radius: 45% 45% 42% 42%;
  background: radial-gradient(circle at 50% 55%, #fff4cf 0%, #ffc066 45%, #d8662f 100%);
  box-shadow: 0 0 14px 4px rgba(255, 180, 90, .55), 0 0 60px 18px rgba(255, 150, 70, .2);
  animation: orb-pulse 2.6s ease-in-out infinite alternate;
}
@keyframes orb-pulse {
  from { opacity: .75; scale: .94; }
  to   { opacity: 1;   scale: 1.06; }
}
.screen__text {
  margin: 0;
  font-size: clamp(24px, 4.6vh, 46px);
  font-weight: 600;
  letter-spacing: .42em;
  text-indent: .42em;
  color: #f8e6c8;
  text-shadow: 0 0 18px rgba(255, 180, 100, .45);
}
.screen__text .ch {
  display: inline-block;
  opacity: 0;
  filter: blur(6px);
  animation: ch-in 1.1s ease forwards;
  animation-delay: calc(var(--i) * 110ms + 900ms);
}
@keyframes ch-in { to { opacity: 1; filter: blur(0); } }
.screen__text .ch--group { letter-spacing: 0; margin-right: .42em; }
.screen__sub {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 2;
  letter-spacing: .2em;
  color: rgba(240, 220, 195, .62);
  opacity: 0;
  animation: fade-in 1.2s ease 2.2s forwards;
}
.screen__tiny { font-size: 12px; letter-spacing: .1em; opacity: .75; }
.screen__back {
  margin-top: 46px;
  opacity: 0;
  animation: fade-in 1.2s ease 2.8s forwards;
}
@keyframes fade-in { to { opacity: 1; } }

/* =========================================================================
   载入
   ========================================================================= */
.loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-content: center;
  justify-items: center;
  background: #07050f;
  transition: opacity 1s ease, visibility 0s linear 1s;
}
.loader__text {
  margin: 0;
  font-size: 13px;
  letter-spacing: .45em;
  text-indent: .45em;
  color: rgba(240, 220, 195, .6);
}
.app:not(.is-loading) .loader { opacity: 0; visibility: hidden; }

.noscript { position: fixed; inset: auto 0 40%; text-align: center; color: #f3e2c8; }

/* =========================================================================
   进场动画：天空 → 远景 → 鲸 → 前景（图层的 --delay 由 scene-config.js 提供）
            → 徽记与标题 → 菜单项逐个滑入
   ========================================================================= */
.app.is-intro .layer { opacity: var(--op, 1); }
.app.is-intro .particles,
.app.is-intro .ui-scrim { opacity: 1; }

.title-block > *,
.title-block > .title {
  opacity: 0;
  transition: opacity 1.6s ease, transform 1.8s cubic-bezier(.2, .8, .2, 1), filter 1.6s ease;
}
.title-block > .emblem-wrap { transform: translateY(1.2vh) scale(.94); filter: blur(4px); transition-delay: var(--t-title); }
.title-block > .title { transform: translateY(1.2vh); filter: blur(6px); transition-delay: calc(var(--t-title) + 250ms); }
.title-block > .title-divider { transform: scaleX(.2); transition-delay: calc(var(--t-title) + 550ms); }
.title-block > .subtitle { transform: translateY(.8vh); transition-delay: calc(var(--t-title) + 700ms); }
.app.is-intro .title-block > * { opacity: 1; transform: none; filter: none; }

.menu-list > li {
  opacity: 0;
  transform: translateX(2.2em);
  transition: opacity .8s ease, transform 1s cubic-bezier(.2, .8, .2, 1);
  transition-delay: calc(var(--t-menu) + var(--i, 0) * 130ms);
}
.app.is-intro .menu-list > li { opacity: 1; transform: none; }
.menu-indicator { transition-delay: 0s; }
.app:not(.is-ready) .menu-indicator { opacity: 0 !important; }
.key-hints { opacity: 0; transition: opacity 1.2s ease 4900ms; }
.app.is-intro .key-hints { opacity: 1; }

/* 跳过进场（任意键 / 点击 / ?nointro） */
.app.intro-skip .layer,
.app.intro-skip .particles,
.app.intro-skip .ui-scrim,
.app.intro-skip .title-block > *,
.app.intro-skip .menu-list > li,
.app.intro-skip .key-hints {
  transition-delay: 0s !important;
  transition-duration: .5s !important;
}

/* =========================================================================
   减少动态（设置开关；首次访问时跟随系统 prefers-reduced-motion）
   ========================================================================= */
.reduce-motion .layer--whale .layer__box,
.reduce-motion .layer--light .layer__box,
.reduce-motion .emblem-wrap,
.reduce-motion .lantern-icon,
.reduce-motion .title__sheen,
.reduce-motion .glow,
.reduce-motion .screen__lantern,
.reduce-motion .loader__lantern {
  animation: none !important;
}
.reduce-motion .layer { transition-duration: .8s; transition-delay: calc(var(--delay, 0ms) * .2); }
.reduce-motion .particles,
.reduce-motion .ui-scrim { transition-delay: .4s; }
.reduce-motion .title-block > * { transform: none !important; filter: none !important; transition-duration: .8s; }
.reduce-motion .title-block > .emblem-wrap { transition-delay: .5s; }
.reduce-motion .title-block > .title,
.reduce-motion .title-block > .title-divider,
.reduce-motion .title-block > .subtitle { transition-delay: .7s; }
.reduce-motion .menu-list > li { transform: none; transition-duration: .6s; transition-delay: calc(.9s + var(--i, 0) * 60ms); }
.reduce-motion .key-hints { transition-delay: 1.2s; }
.reduce-motion .menu-item,
.reduce-motion .menu-indicator { transition-duration: .15s; }
.reduce-motion .menu-item.is-selected { transform: none; }
.reduce-motion .credits-roll { animation: none; }
.reduce-motion .credits-viewport { overflow-y: auto; -webkit-mask-image: none; mask-image: none; }
.reduce-motion .screen__text .ch { animation-duration: .01s; animation-delay: .3s; filter: none; }
.reduce-motion .screen__sub,
.reduce-motion .screen__back { animation-delay: .4s; animation-duration: .3s; }

/* =========================================================================
   响应式：竖屏 / 窄屏 —— 标题在上、菜单在下，场景居中
   ========================================================================= */
@media (max-aspect-ratio: 1/1), (max-width: 760px) {
  .ui-column {
    left: 0;
    right: 0;
    width: auto;
    justify-content: flex-start;
    gap: 1.5vh;
    padding: 4.5vh 5vw 4vh;
  }
  .whale-slot { display: block; flex: 1 1 auto; width: 100%; min-height: 16vh; }
  .emblem { height: clamp(56px, 11vh, 150px); }
  .title { font-size: clamp(30px, min(7vh, 11vw), 96px); }
  .subtitle { font-size: clamp(10px, min(1.8vh, 3vw), 18px); letter-spacing: .42em; padding-left: .42em; }
  .menu { --menu-fs: clamp(15px, min(2.7vh, 5vw), 28px); }
  .menu-item { padding-top: .32em; padding-bottom: .42em; }
  .ui-scrim {
    background:
      linear-gradient(180deg, rgba(12, 8, 30, .5) 0%, rgba(12, 8, 30, 0) 32%),
      linear-gradient(0deg, rgba(12, 8, 30, .62) 0%, rgba(12, 8, 30, 0) 38%);
  }
  .key-hints { display: none; }
}
@media (max-height: 460px) and (min-aspect-ratio: 1/1) {
  .emblem { height: 15vh; }
  .ui-column { gap: 2vh; }
  .key-hints { display: none; }
}