/* ==========================================================================
   NEXUS 聚。場 — splash.css（開場封面／布幕／遺留側翼）
   --------------------------------------------------------------------------
   參數勿寫死於此，請改 src/data/splash-curtain-config.json
   或調參表（?curtainTuner=1 / showTuner:true）。

   【檔案區塊】
     .splash-cover              開場全螢幕蓋層
     .splash-curtain--docked    開場後遺留側翼（左右 / \）← 上緣／長度在這
     .splash-curtain            開場布幕本體
     .curtain-tuner             參數預覽表單

   【遺留側翼／過場上方空白／缺塊常見原因】
     1) .hero__stage { overflow:hidden } 裁掉 blur／旋轉布邊 → 有側翼時改 visible
     2) 層級：側翼(body) fixed 4500 ＞ 窄選單 4000；燈光在選單下方完整露出
     3) dockTopVh＞0（含 localStorage 草稿）把盒子下移 → 調回 0
     4) 褶片 border-radius 圓頂＋rotation/skew 繞上角旋轉 → 內側褶片下沉露出缺塊
     5) docked/opening + filter:blur + body overflow 裁切 → 頂部透明軟邊（勿用 blur）
     6) .splash-cover 預設 overflow:hidden 裁掉上溢 → .is-opening 須 overflow:visible
        （對症：壓平上緣圓角、加大 inner 上溢、過場 sealTop 負 y、拿掉 blur）

   【上緣／長度參數鏈】
     JSON wings.dockTopVh / dockLengthVh
     → splash-curtain-config.js applyCurtainCssVars()
     → --wing-dock-top / --wing-dock-length
     → 下方 .splash-curtain--docked.is-wings 的 top / height
     詳見 doc/frontend-rules.md「布幕遺留側翼參數」
   ========================================================================== */

.splash-cover {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #050b1c;
  cursor: pointer;
  opacity: 1;
  transition: opacity 0.55s ease, background-color 0.8s ease;
  pointer-events: auto;
  overflow: hidden;
}

/* Logo 閃現：免點擊，不攔截後續操作 */
.splash-cover--logo {
  cursor: default;
  pointer-events: none;
}

/* 布幕自動開場：仍可點提前揭幕，預設不顯示提示 */
.splash-cover--auto-curtain {
  cursor: default;
}

/* ----- Logo 閃現層（splash-logo.js）----- */
.splash-logo {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.splash-logo__glow {
  position: absolute;
  width: min(42vw, 22rem);
  height: min(42vw, 22rem);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(56, 189, 248, 0.35) 0%,
    rgba(59, 130, 246, 0.12) 42%,
    transparent 70%
  );
  opacity: 0;
  transform: scale(0.72);
  transition:
    opacity 0.45s ease,
    transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

.splash-logo__mark {
  position: relative;
  z-index: 1;
  width: min(210px, 46vw);
  height: auto;
  opacity: 0;
  transform: scale(0.86);
  filter:
    drop-shadow(0 0 28px rgba(56, 189, 248, 0.35))
    drop-shadow(0 12px 28px rgba(0, 0, 0, 0.55));
  transition:
    opacity 0.45s ease,
    transform 0.55s cubic-bezier(0.22, 1, 0.36, 1),
    filter 0.45s ease;
}

.splash-logo.is-in .splash-logo__glow {
  opacity: 1;
  transform: scale(1);
}

.splash-logo.is-in .splash-logo__mark {
  opacity: 1;
  transform: scale(1);
}

.splash-logo.is-out .splash-logo__glow {
  opacity: 0;
  transform: scale(1.12);
  transition-duration: 0.65s;
}

.splash-logo.is-out .splash-logo__mark {
  opacity: 0;
  transform: scale(1.06);
  filter:
    drop-shadow(0 0 40px rgba(56, 189, 248, 0.55))
    drop-shadow(0 12px 28px rgba(0, 0, 0, 0.35));
  transition-duration: 0.65s;
}

.splash-cover[hidden] {
  display: none !important;
}

.splash-cover.is-opening {
  background: transparent;
  /* 揭幕後勿擋住下方導覽／按鈕 */
  pointer-events: none;
  /* 允許布幕上溢，否則 rotation/skew 補償被裁成頂部空隙 */
  overflow: visible;
}

/* 手機：開場／過場期間封面保持實心底，避免揭幕圖淡出後「透出主頁再淡入」像重複播 */
@media (hover: none) and (pointer: coarse) {
  .splash-cover.is-opening,
  .splash-cover.is-parked {
    background: #050b1c;
  }

  .splash-cover.is-parked.is-leaving--fade {
    background: #050b1c;
    opacity: 0;
    transition: opacity 0.45s ease;
  }
}

/* 手機開場：關掉封面 transition（勿用 contain:strict，部分 WebView 會卡死子層） */
html.is-splash-mobile #splash-cover {
  transition: none !important;
  contain: paint;
  transform: translateZ(0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

html.is-splash-mobile.is-splash-holding .site-header,
html.is-splash-mobile.is-splash-holding main {
  content-visibility: hidden;
}

html.is-splash-mobile .splash-curtain__unit {
  will-change: auto;
  filter: none !important;
}

html.is-splash-mobile .splash-reveal__photo,
html.is-splash-mobile .splash-reveal__verse {
  will-change: opacity;
  filter: none !important;
}

/* 手機輕量開場：關掉高成本濾鏡／偽元素 */
.splash-cover--lite,
.splash-curtain--lite {
  --curtain-blur: 0;
}

.splash-curtain--lite .splash-curtain__grain,
.splash-curtain--lite .splash-curtain__veil {
  display: none !important;
}

/* 手機仍保留褶片造型；關掉高成本 blur 偽元素 */
.splash-curtain--lite .splash-curtain__unit::before,
.splash-curtain--lite .splash-curtain__unit::after {
  content: none !important;
  display: none !important;
  filter: none !important;
}

.splash-curtain--lite .splash-curtain__unit {
  margin: 0 -2vw;
  border-radius: 50% / 14%;
  box-shadow:
    inset 18px 0 28px rgba(0, 0, 0, 0.18),
    inset -18px 0 28px rgba(0, 0, 0, 0.18),
    0 12px 28px rgba(0, 0, 0, 0.14);
  background:
    linear-gradient(
      180deg,
      rgba(126, 200, 245, calc(var(--light) * 0.12)) 0%,
      transparent 34%,
      transparent 70%,
      rgba(0, 0, 0, 0.28) 100%
    ),
    linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.34) 0%,
      #0a1528 14%,
      #1a3a62 36%,
      #2a5a8a 48%,
      #3a78a8 50%,
      #2a5a8a 52%,
      #1a3a62 66%,
      #0a1528 86%,
      rgba(0, 0, 0, 0.36) 100%
    );
}

.splash-curtain--lite .splash-curtain__logo-plate {
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  background: rgba(5, 11, 28, 0.72);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

.splash-curtain--lite .splash-curtain__logo-mark {
  filter: drop-shadow(0 8px 14px rgba(0, 0, 0, 0.45));
}

.splash-reveal--lite .splash-reveal__photo {
  will-change: opacity;
  filter: none !important;
}

.splash-reveal--lite .splash-reveal__verse {
  will-change: opacity, transform;
}

.splash-cover.is-opening .splash-curtain {
  pointer-events: none;
}

.splash-cover.is-leaving {
  pointer-events: none;
}

.splash-cover.is-leaving--fade {
  opacity: 0;
  transition: opacity 1.35s ease;
}

.splash-cover--logo.is-leaving--fade {
  transition: opacity 0.55s ease;
}

/* 揭幕完成：左右布幕壓在 banner 上（不全退）；中央可互動 */
.splash-cover.is-wings {
  z-index: 50;
  background: transparent;
  pointer-events: none;
  cursor: default;
  overflow: visible;
}

/* 小螢幕停泊：保留節點但不擋互動、不露側翼 */
.splash-cover.is-parked {
  z-index: 50;
  background: transparent;
  pointer-events: none;
  cursor: default;
  overflow: visible;
}

.splash-cover.is-parked .splash-curtain__inner {
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

/* Dialog 開啟時暫藏側翼（勿用 hidden，關閉後需還原） */
.splash-cover.is-behind-dialog {
  visibility: hidden;
  pointer-events: none;
}

.splash-curtain.is-wings {
  overflow: visible;
}

.splash-curtain.is-wings .splash-curtain__stage,
.splash-curtain.is-wings .splash-curtain__grain,
.splash-curtain.is-wings .splash-curtain__veil,
.splash-curtain.is-wings .splash-curtain__logo-btn {
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

/* ==========================================================================
   遺留側翼 .splash-curtain--docked.is-wings（開場播完後左右 / \）
   --------------------------------------------------------------------------
   掛點：js/fx/splash-curtain.js → dockWingsToHero() → 塞进 .hero__stage

   層級：
     選單 .hero__nav-rail：fixed、z-index 4000（窄膠囊，不擋燈光）
     遺留側翼：掛 body + fixed、z-index 4500（壓在選單兩側）
   ========================================================================== */

/* 側翼已改掛 body；舞台維持可見以免開場裁切 */
.hero__stage:has(.splash-curtain.splash-curtain--docked.is-wings),
.hero__stage:has(+ .splash-curtain.splash-curtain--docked.is-wings) {
  overflow: visible;
}

html.wing-dock-clip .hero__stage {
  overflow: hidden;
}

.splash-curtain.splash-curtain--docked.is-wings {
  position: fixed;
  top: var(--wing-dock-top, 0vh);
  right: 0;
  left: 0;
  bottom: auto;
  height: var(--wing-dock-length, 100svh);
  max-height: 100svh;
  z-index: 4500;
  width: auto;
  pointer-events: none;
  overflow: visible;
  background: transparent;
}

.splash-curtain.splash-curtain--docked.is-wings .splash-curtain__unit {
  /* 壓平上緣：開場用的 50%/14% 橢圓頂會在貼頂時露出一排缺塊 */
  height: calc(100% + var(--sag) * 5%);
  margin-top: 0;
  border-radius: 0 0 42% 42% / 0 0 12% 12%;
}

/* 星空舞台捲出視窗後暫隱側翼，避免蓋住下方區塊 */
.splash-curtain.splash-curtain--docked.is-wings.is-stage-away .splash-curtain__inner {
  opacity: 0;
  visibility: hidden;
}

.splash-curtain.is-parked .splash-curtain__inner {
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

.splash-curtain.is-behind-dialog {
  visibility: hidden;
  pointer-events: none;
}

/* / \ 形：clip 百分比由 --wing-clip-* 控制（見 splash-curtain-config） */
.splash-curtain.is-opening .splash-curtain__inner--left,
.splash-curtain.is-wings .splash-curtain__inner--left {
  clip-path: polygon(
    0 0,
    var(--wing-clip-l-top, 48%) 0,
    var(--wing-clip-l-bot, 100%) 100%,
    0 100%
  );
  transition: clip-path 2.8s ease;
}

.splash-curtain.is-opening .splash-curtain__inner--right,
.splash-curtain.is-wings .splash-curtain__inner--right {
  clip-path: polygon(
    var(--wing-clip-r-top, 52%) 0,
    100% 0,
    100% 100%,
    var(--wing-clip-r-bot, 0%) 100%
  );
  transition: clip-path 2.8s ease;
}

.splash-curtain:not(.is-opening):not(.is-wings) .splash-curtain__inner--left,
.splash-curtain:not(.is-opening):not(.is-wings) .splash-curtain__inner--right {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.splash-curtain.is-opening .splash-curtain__inner--left,
.splash-curtain.is-wings .splash-curtain__inner--left {
  transform-origin: left top;
}

.splash-curtain.is-opening .splash-curtain__inner--right,
.splash-curtain.is-wings .splash-curtain__inner--right {
  transform-origin: right top;
}

/* 開場／過場期間鎖捲動，結束後停在舞台頂 */
html.is-splash-holding,
html.is-splash-revealing {
  overflow: hidden;
}

html.is-splash-holding body,
html.is-splash-revealing body {
  overflow: hidden;
}

/* 揭幕時：頁面內容淡入出場 */
html.is-splash-holding .site-header,
html.is-splash-holding main {
  opacity: 0;
  pointer-events: none;
}

html.is-splash-revealing .site-header,
html.is-splash-revealing main {
  opacity: 1;
  pointer-events: auto;
  transition: opacity 1.8s ease;
}

/* 揭幕進行中：封面層不再攔截點擊（桌機）；手機維持蓋住直到 finish，避免透出主頁閃爍 */
html.is-splash-revealing #splash-cover {
  pointer-events: none;
}

@media (hover: none) and (pointer: coarse) {
  html.is-splash-holding #splash-cover {
    background: #050b1c;
  }

  /* 手機過場期間若尚未 beginPageReveal，維持 holding，不提前透出 main */
  html.is-splash-holding .site-header,
  html.is-splash-holding main {
    opacity: 0 !important;
    visibility: hidden;
    pointer-events: none !important;
  }

  html.is-splash-revealing .site-header,
  html.is-splash-revealing main {
    visibility: visible;
    transition: opacity 0.4s ease;
  }
}

@media (prefers-reduced-motion: reduce) {
  html.is-splash-revealing .site-header,
  html.is-splash-revealing main {
    transition: none;
  }
}

/* ----- 舞台布幕：更柔的天鵝絨布褶 ----- */
.splash-curtain {
  --curtain-navy: #050b1c;
  --curtain-deep: #0a1528;
  --curtain-mid: #10243f;
  --curtain-lit: #1a3f72;
  --curtain-glow: #3ba8e8;
  --curtain-hi: #7ec4ee;
  --side-units: 12;
  --total-units: 24;
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  overflow: hidden;
  background: transparent;
}

.splash-curtain__stage {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(
      ellipse 95% 80% at 74% -8%,
      rgba(59, 168, 232, 0.32) 0%,
      rgba(26, 74, 140, 0.14) 34%,
      transparent 64%
    ),
    radial-gradient(
      ellipse 65% 55% at 50% 118%,
      rgba(0, 0, 0, 0.7) 0%,
      transparent 72%
    ),
    linear-gradient(165deg, #0a1830 0%, #050b1c 45%, #03060f 100%);
  transition: opacity 0.9s ease;
}

.splash-curtain.is-opening .splash-curtain__stage {
  opacity: 0;
}

/* 細緻顆粒＋柔化織感 */
.splash-curtain__grain {
  position: absolute;
  inset: -4%;
  z-index: 3;
  pointer-events: none;
  opacity: 0.34;
  mix-blend-mode: soft-light;
  filter: blur(0.6px);
  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.55' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E"),
    repeating-linear-gradient(
      92deg,
      transparent 0 3px,
      rgba(255, 255, 255, 0.015) 3px 4px
    );
  background-size: 260px 260px, auto;
  transition: opacity 0.8s ease;
}

.splash-curtain.is-opening .splash-curtain__grain {
  opacity: 0;
}

/* 絨面薄紗：讓整片布更融、更軟 */
.splash-curtain__veil {
  position: absolute;
  inset: -2%;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(
    ellipse 70% 60% at 50% 40%,
    rgba(12, 28, 52, 0.18) 0%,
    transparent 70%
  );
  backdrop-filter: blur(1.2px);
  -webkit-backdrop-filter: blur(1.2px);
  opacity: 0.55;
  transition: opacity 0.7s ease;
}

.splash-curtain.is-opening .splash-curtain__veil {
  opacity: 0;
}

.splash-curtain__inner {
  position: absolute;
  top: -8%;
  bottom: -16%;
  width: 54%;
  z-index: 2;
  display: flex;
  margin: auto 0;
  will-change: transform;
  gap: 0;
  /* 強柔焦：消硬邊、像布料擴散 */
  filter: blur(1.15px) contrast(0.92) saturate(1.08) brightness(1.02);
}

.splash-curtain.is-opening {
  overflow: visible;
}

/*
 * 過場即將遺留側翼：長度／上溢與定稿 docked 一致
 * （--wing-dock-length / inner top-bottom 同最終狀態）
 */
.splash-curtain.is-opening.is-settling-wings {
  top: var(--wing-dock-top, 0vh);
  right: 0;
  left: 0;
  bottom: auto;
  height: var(--wing-dock-length, 100%);
  max-height: 100svh;
  overflow: visible;
}

.splash-curtain.is-opening .splash-curtain__inner {
  /*
   * 過場上緣密封：rotation/skew（origin 在上角）會讓內側下沉。
   * 加大上溢蓋住視窗頂；勿用 blur（與 body overflow-x 交會會出頂部透明軟邊）。
   */
  top: -18%;
  bottom: -8%;
  filter: contrast(0.92) saturate(1.08) brightness(1.02);
}

.splash-curtain.is-opening.is-settling-wings .splash-curtain__inner,
.splash-curtain.splash-curtain--docked.is-wings .splash-curtain__inner {
  /*
   * 上溢補償：rotation/skew 讓內側下沉；蓋住選單列兩側。
   * 勿對 docked／settling inner 使用 blur。
   */
  top: -14%;
  bottom: -2.5%;
  height: auto;
  margin: 0;
  filter: contrast(0.96) saturate(1.06) brightness(1.02);
  opacity: 1;
  visibility: visible;
  transition: clip-path 2.8s ease, filter 0.45s ease, opacity 0.2s ease;
}

.splash-curtain.is-opening .splash-curtain__unit {
  will-change: transform, opacity;
  /* 壓平上緣：開場橢圓頂在旋轉時會露出一排缺塊 */
  border-radius: 0 0 42% 42% / 0 0 12% 12%;
  margin-top: 0;
  height: calc(100% + var(--sag) * 5%);
}

.splash-curtain__inner--left {
  left: -2%;
  transform-origin: left top;
  justify-content: flex-end;
}

.splash-curtain__inner--right {
  left: 48%;
  transform-origin: right top;
  justify-content: flex-start;
}

/* 單褶：低對比、大重疊、圓潤垂墜 */
.splash-curtain__unit {
  --light: 0.4;
  --sag: 0.5;
  --fat: 1;
  position: relative;
  flex: var(--fat) 1 0;
  height: calc(100% + var(--sag) * 5%);
  margin: 0 -2.4vw;
  border-radius: 50% / 14%;
  transform-origin: center top;
  overflow: hidden;
  opacity: 0.94;
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--curtain-glow) calc(var(--light) * 22%), transparent) 0%,
      transparent 32%,
      transparent 68%,
      rgba(0, 0, 0, 0.3) 100%
    ),
    radial-gradient(
      ellipse 90% 140% at 50% 45%,
      color-mix(in srgb, var(--curtain-hi) calc(var(--light) * 14%), transparent) 0%,
      transparent 68%
    ),
    linear-gradient(
      90deg,
      rgba(0, 0, 0, 0.32) 0%,
      color-mix(in srgb, var(--curtain-deep) 55%, transparent) 16%,
      color-mix(in srgb, var(--curtain-mid) 90%, var(--curtain-lit)) 34%,
      color-mix(in srgb, var(--curtain-lit) calc(var(--light) * 42%), var(--curtain-mid)) 47%,
      color-mix(in srgb, var(--curtain-hi) calc(var(--light) * 16%), var(--curtain-lit)) 50%,
      color-mix(in srgb, var(--curtain-lit) calc(var(--light) * 42%), var(--curtain-mid)) 53%,
      color-mix(in srgb, var(--curtain-mid) 90%, var(--curtain-lit)) 66%,
      color-mix(in srgb, var(--curtain-deep) 55%, transparent) 84%,
      rgba(0, 0, 0, 0.34) 100%
    );
  box-shadow:
    inset 28px 0 48px rgba(0, 0, 0, 0.14),
    inset -28px 0 48px rgba(0, 0, 0, 0.14),
    0 18px 40px rgba(0, 0, 0, 0.12);
}

.splash-curtain__unit::before {
  content: "";
  position: absolute;
  inset: -6% -14%;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, calc(0.015 + var(--light) * 0.03)) 30%,
    rgba(200, 230, 255, calc(0.04 + var(--light) * 0.08)) 50%,
    rgba(255, 255, 255, calc(0.015 + var(--light) * 0.03)) 70%,
    transparent 100%
  );
  filter: blur(12px);
  opacity: 0.75;
}

.splash-curtain__unit::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(
      ellipse 120% 42% at 50% -10%,
      rgba(126, 200, 245, calc(var(--light) * 0.18)) 0%,
      transparent 75%
    ),
    linear-gradient(
      180deg,
      transparent 48%,
      rgba(0, 0, 0, 0.22) 100%
    );
}

/* ----- 立體 Logo 按鈕（浮在布幕上） ----- */
.splash-curtain__logo-btn {
  position: absolute;
  left: 50%;
  top: 46%;
  z-index: 8;
  transform: translate(-50%, -50%);
  pointer-events: auto;
  cursor: pointer;
  border: none;
  padding: clamp(1.1rem, 2.8vw, 1.75rem) clamp(1.35rem, 3.2vw, 2.1rem);
  border-radius: 1.35rem;
  background: transparent;
  isolation: isolate;
  animation: splash-logo-float 4.2s ease-in-out infinite;
  transition:
    transform 0.25s ease,
    filter 0.25s ease,
    opacity 0.35s ease;
}

/*
 * 自動開場：
 * 1) 布幕＋Logo 進站即在（is-intro-present）
 * 2) Logo 淡出（is-intro-fade-out）
 * 3) 布幕拉開，後方已是 lalaport2
 */
.splash-curtain.is-intro-black .splash-curtain__stage,
.splash-curtain.is-intro-black .splash-curtain__inner,
.splash-curtain.is-intro-black .splash-curtain__veil,
.splash-curtain.is-intro-black .splash-curtain__grain {
  opacity: 0;
  visibility: hidden;
}

/* 進站：布幕上的 Logo */
.splash-curtain__logo-btn.is-intro-present {
  animation: none;
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
  filter: none;
  transition: none;
}

/* Logo 自動淡出（布幕仍留著） */
.splash-curtain__logo-btn.is-intro-fade-out {
  animation: none;
  opacity: 0;
  transform: translate(-50%, -50%) scale(1);
  pointer-events: none;
  transition: opacity 0.75s ease;
}

.splash-curtain__logo-btn.is-intro-wait {
  animation: none;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.88);
  filter: brightness(0.75);
}

.splash-curtain__logo-btn.is-intro-flash {
  animation: splash-logo-intro-flash 1.1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.splash-curtain__logo-btn.is-intro-gone {
  animation: none;
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

.splash-curtain__logo-btn.is-intro-soft {
  animation: splash-logo-intro-soft 0.55s ease forwards;
}

@keyframes splash-logo-intro-soft {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

@media (hover: none) and (pointer: coarse) {
  .splash-curtain__logo-btn {
    animation: none;
  }

  html.is-splash-revealing .site-header,
  html.is-splash-revealing main {
    transition: opacity 0.45s ease;
  }

  .splash-reveal,
  .splash-reveal__photo {
    background-color: #050b1c;
  }
}

@keyframes splash-logo-intro-flash {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.86);
    filter: brightness(0.7) drop-shadow(0 0 0 transparent);
  }
  30% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.06);
    filter:
      brightness(1.45)
      drop-shadow(0 0 28px rgba(56, 189, 248, 0.65))
      drop-shadow(0 12px 28px rgba(0, 0, 0, 0.45));
  }
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
    filter:
      brightness(1.12)
      drop-shadow(0 0 18px rgba(56, 189, 248, 0.35))
      drop-shadow(0 10px 22px rgba(0, 0, 0, 0.4));
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.96);
    filter:
      brightness(1)
      drop-shadow(0 0 0 transparent);
  }
}

.splash-curtain__logo-plate {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  z-index: 0;
  background:
    linear-gradient(
      155deg,
      rgba(40, 90, 150, 0.35) 0%,
      rgba(8, 18, 36, 0.72) 42%,
      rgba(3, 8, 18, 0.88) 100%
    );
  border: 1px solid rgba(180, 220, 255, 0.22);
  box-shadow:
    0 28px 60px rgba(0, 0, 0, 0.55),
    0 10px 28px rgba(10, 40, 90, 0.45),
    0 0 40px rgba(59, 168, 232, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.28),
    inset 0 -10px 22px rgba(0, 0, 0, 0.45),
    inset 0 0 0 1px rgba(59, 168, 232, 0.12);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
}

.splash-curtain__logo-plate::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  top: 0;
  height: 42%;
  border-radius: 1.2rem 1.2rem 50% 50%;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.22) 0%,
    transparent 100%
  );
  opacity: 0.55;
  pointer-events: none;
}

.splash-curtain__logo-mark {
  position: relative;
  z-index: 1;
  display: block;
  width: min(210px, 46vw);
  height: auto;
  max-height: min(52vh, 280px);
  object-fit: contain;
  background: transparent;
  user-select: none;
  filter:
    drop-shadow(0 1px 0 rgba(255, 255, 255, 0.25))
    drop-shadow(0 2px 0 rgba(0, 0, 0, 0.35))
    drop-shadow(0 10px 18px rgba(0, 0, 0, 0.5));
}

.splash-curtain__logo-btn:hover {
  animation-play-state: paused;
  transform: translate(-50%, -50%) translateY(-4px) scale(1.03);
  filter: brightness(1.06);
}

.splash-curtain__logo-btn:hover .splash-curtain__logo-plate {
  box-shadow:
    0 34px 70px rgba(0, 0, 0, 0.6),
    0 12px 32px rgba(20, 70, 140, 0.5),
    0 0 52px rgba(59, 168, 232, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.34),
    inset 0 -10px 22px rgba(0, 0, 0, 0.4),
    inset 0 0 0 1px rgba(126, 200, 245, 0.22);
}

.splash-curtain__logo-btn:active {
  transform: translate(-50%, -50%) translateY(1px) scale(0.98);
  filter: brightness(0.96);
}

.splash-curtain.is-opening .splash-curtain__logo-btn,
.splash-curtain__logo-btn.is-intro-gone {
  animation: none;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
  z-index: 0;
}

@keyframes splash-logo-float {
  0%, 100% { transform: translate(-50%, -50%) translateY(0); }
  50% { transform: translate(-50%, -50%) translateY(-6px); }
}

@media (prefers-reduced-motion: reduce) {
  .splash-curtain__logo-btn {
    animation: none;
  }
}

/* ----- 布幕參數預覽表單 ----- */
.curtain-tuner {
  position: fixed;
  top: 4.5rem;
  right: 0.75rem;
  z-index: 10050;
  width: min(22rem, calc(100vw - 1.5rem));
  max-height: calc(100svh - 5.5rem);
  display: flex;
  flex-direction: column;
  gap: 0;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 215, 122, 0.35);
  background: rgba(8, 14, 28, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.55);
  color: #e8eef8;
  font-family: "Noto Sans TC", sans-serif;
  font-size: 0.78rem;
  pointer-events: auto;
  overflow: hidden;
}

.curtain-tuner.is-minimized .curtain-tuner__body,
.curtain-tuner.is-minimized .curtain-tuner__foot {
  display: none;
}

.curtain-tuner__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(90deg, rgba(255, 215, 122, 0.12), transparent);
}

.curtain-tuner__icon {
  border: 0;
  background: rgba(255, 255, 255, 0.08);
  color: inherit;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 0.35rem;
  cursor: pointer;
}

.curtain-tuner__body {
  overflow: auto;
  padding: 0.5rem 0.75rem 0.25rem;
  flex: 1;
}

.curtain-tuner__group {
  margin-bottom: 0.75rem;
}

.curtain-tuner__group h3 {
  margin: 0 0 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: rgba(255, 215, 122, 0.9);
  text-transform: uppercase;
}

.curtain-tuner__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  margin-bottom: 0.55rem;
}

.curtain-tuner__label {
  color: rgba(220, 230, 245, 0.82);
}

.curtain-tuner__row input[type="range"] {
  width: 100%;
  accent-color: #e0b85a;
}

.curtain-tuner__row input[type="number"] {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 0.35rem;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  padding: 0.25rem 0.4rem;
}

.curtain-tuner__foot {
  padding: 0.55rem 0.75rem 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.curtain-tuner__check--block {
  margin-bottom: 0.55rem;
}

.curtain-tuner__color {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.4rem;
  align-items: center;
}

.curtain-tuner__color input[type="color"] {
  width: 2.4rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.35rem;
  background: transparent;
  cursor: pointer;
}

.curtain-tuner__color input[type="text"] {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 0.35rem;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  padding: 0.25rem 0.4rem;
  font-family: ui-monospace, Consolas, monospace;
}

.curtain-tuner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.curtain-tuner__actions button {
  border: 1px solid rgba(255, 215, 122, 0.35);
  background: rgba(255, 215, 122, 0.1);
  color: #f5e6b8;
  border-radius: 999px;
  padding: 0.28rem 0.65rem;
  font-size: 0.72rem;
  cursor: pointer;
}

.curtain-tuner__actions button:hover {
  background: rgba(255, 215, 122, 0.22);
}

.curtain-tuner__hint {
  margin: 0;
  color: rgba(200, 214, 235, 0.7);
  line-height: 1.4;
}

.curtain-tuner__hint code {
  color: #f5e6b8;
  font-size: 0.7rem;
}

.curtain-tuner__export {
  width: 100%;
  box-sizing: border-box;
  border-radius: 0.4rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.45);
  color: #cfe0f5;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.65rem;
  padding: 0.4rem;
  resize: vertical;
}

@media (max-width: 720px) {
  .curtain-tuner {
    top: auto;
    right: 0.5rem;
    left: 0.5rem;
    bottom: calc(0.5rem + env(safe-area-inset-bottom, 0px));
    width: auto;
    max-height: min(52svh, 28rem);
  }
}

/* ----- 揭幕中場：滿版 LaLaport 漸暗＋三句標語 ----- */
.splash-reveal {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: none;
  pointer-events: none;
  opacity: 0;
  overflow: hidden;
  background: #050b1c;
}

.splash-reveal__photo {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  border: none;
  border-radius: 0;
  box-shadow: none;
  background-color: #050b1c;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0;
  transform-origin: center center;
  will-change: opacity, transform, filter;
}

.splash-reveal__dim {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(
    180deg,
    rgba(2, 6, 18, 0.15) 0%,
    rgba(2, 6, 18, 0.55) 45%,
    rgba(2, 6, 18, 0.88) 100%
  );
  opacity: 0;
}

.splash-reveal__verses {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(0.65rem, 2.2vw, 1.15rem);
  padding: 1.25rem 1.5rem;
  text-align: center;
  perspective: 900px;
}

.splash-reveal__verse {
  margin: 0;
  max-width: 18ch;
  font-family: "Noto Sans TC", "Source Han Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-size: clamp(1.15rem, 3.8vw, 2.05rem);
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.35;
  color: rgba(255, 252, 245, 0.96);
  text-shadow:
    0 1px 0 rgba(0, 0, 0, 0.35),
    0 10px 28px rgba(0, 0, 0, 0.55);
  will-change: transform, opacity;
  transform-origin: center center;
}

@media (max-width: 720px) {
  .splash-reveal__photo {
    background-size: cover;
    background-position: center 40%;
  }

  .splash-reveal__verse {
    letter-spacing: 0.16em;
  }
}