/* ============================================================
   * StarCirclePortal · 深空粒子涡流门户 - 样式
   * 融合 Vortex(涡流引擎)× StarCirclePortal(门户场景)方案 A:
   * 涡流为"海"、光盘为"焦点";流星雨/闪光场/上升光束/光弦主光柱已移除
   * ============================================================ */

  /* ============ Design Tokens ============ */
  :root {
    /* 色彩(仅暗色,OLED 深空底) */
    --bg-deep:     #020617;
    --frost:       #F8FAFC;
    --accent:      #7AA8FF;
    --accent-soft: #CFE3FF;
    --base-deep:   #03050d;
    --hue-vortex:  220;   /* Vortex 粒子基础色相(蓝紫,与门户蓝白同族) */
    --ease-fall:   cubic-bezier(0.23, 0.62, 0.36, 0.98);  /* 流星光雨下落缓动 */

    /* z-index 刻度:0 涡流 / 1 空间 / 3 光盘 / 4 流星雨 / 10 内容 / 40 浮层 */
    --z-vortex: 0;
    --z-space:  1;
    --z-disc:   3;
    --z-rain:   4;
    --z-content: 10;
    --z-float:  40;
  }

  /* ============ Base ============ */
  *,*::before,*::after { box-sizing: border-box; }
  html, body { margin: 0; padding: 0; height: 100%; }
  body {
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
    color: var(--frost);
    background: var(--bg-deep);
    overflow: hidden;
  }
  a { color: inherit; text-decoration: none; }

  /* ============ Scene (background) ============ */
  .scene {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    background:
      radial-gradient(ellipse at 50% 110%, rgba(36, 64, 160, 0.45) 0%, rgba(8, 12, 30, 0) 55%),
      radial-gradient(ellipse at 50% 0%, rgba(80, 30, 180, 0.18) 0%, rgba(0,0,0,0) 60%),
      linear-gradient(180deg, #04060f 0%, #060a1c 60%, #03050d 100%);
  }

  /* ============ L0 氛围底:Vortex 粒子涡流场 ============ */
  .vortex-field {
    position: absolute;
    inset: 0;
    z-index: var(--z-vortex);
    width: 100%;
    height: 100%;
    pointer-events: none;          /* 指针交互由 window 级监听承接 */
  }

  /* ============ L1 空间:点阵 + 透视地面 ============ */
  .space-grid {
    position: absolute;
    inset: 0;
    z-index: var(--z-space);
    pointer-events: none;
    background-image: radial-gradient(circle at center, rgba(143, 180, 255, .10) 1px, transparent 1px);
    background-size: 42px 42px;
    -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,.5), transparent 76%);
            mask-image: linear-gradient(to bottom, rgba(0,0,0,.5), transparent 76%);
  }

  /* 地面：透视网格 + 顶部椭圆光晕(由 ::after 实现) */
  .floor {
    position: absolute;
    inset: auto 0 0 0;
    height: 45vh;
    transform: perspective(700px) rotateX(60deg);
    transform-origin: 50% 100%;
    background:
      linear-gradient(180deg, rgba(80,150,255,.18) 0%, rgba(20,40,90,.10) 60%, rgba(0,0,0,0) 100%),
      repeating-linear-gradient(90deg,
        rgba(120,180,255,.55) 0 1px,
        transparent 1px 80px),
      repeating-linear-gradient(0deg,
        rgba(120,180,255,.35) 0 1px,
        transparent 1px 60px);
    mask-image: linear-gradient(180deg, #000 0%, rgba(0,0,0,.9) 50%, transparent 100%);
    -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0,0,0,.9) 50%, transparent 100%);
  }
  .floor::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(80,160,255,.35) 0%, transparent 60%);
  }

  /* ============ L3 焦点:旋转光盘 ============ */
  @property --orbit-a {
    syntax: "<angle>";
    inherits: false;
    initial-value: 0deg;
  }
  @keyframes disc-spin {
    from { transform: rotateX(82deg) rotateZ(0deg); }
    to   { transform: rotateX(82deg) rotateZ(360deg); }
  }
  /* 盘上流星轨道环流:--orbit-a 驱动粒子沿同心圆公转,内快外慢分层;
     相位由 animation-delay 错开;reduced-motion 时 --orbit-a 取内联随机值静态散布 */
  @keyframes orbit-revolve {
    from { --orbit-a: 0deg; }
    to   { --orbit-a: 360deg; }
  }
  /* 顶冠呼吸 */
  @keyframes halo-pulse {
    0%, 100% { opacity: .8; transform: translateX(-50%) scale(1); }
    50%      { opacity: 1;  transform: translateX(-50%) scale(1.06); }
  }
  /* 去彩虹:仅亮度呼吸 */
  @keyframes meteor-twinkle {
    0%, 100% { opacity: .4; filter: brightness(.85); }
    50%      { opacity: 1;  filter: brightness(1.35); }
  }
  @keyframes core-pulse {
    0%, 100% { transform: scale(1);    opacity: .85; }
    50%      { transform: scale(1.25); opacity: 1; }
  }

  .orbit {
    position: relative;
    width: 100%;
    height: clamp(340px, 50vh, 380px);
    overflow: visible;
    z-index: var(--z-disc);
  }

  /* 光盘组件整体放大 2.0× 并上移 30px(translateY 置于 scale 左侧,不被放大,精确平移):
     盘体 + 周边饰 + 盘上粒子/轨道/拖尾/发光/透视 同比例;
     scale 围绕盘心,平移让盘整体上抬避让文字 */
  .disc-assembly {
    position: absolute;
    inset: 0;
    transform: translateY(-30px) scale(2);
    transform-origin: 50% 80px;
    filter: brightness(1.5);
  }
  @media (min-width: 640px) {
    .disc-assembly { transform-origin: 50% 105px; }
  }
  @media (max-width: 640px) {
    .disc-assembly { transform-origin: 50% 75px; }
  }

  .orbit-halo,
  .orbit-ring-outer,
  .orbit-ring-inner,
  .projection-shadow {
    left: 50%;
    transform: translateX(-50%);
  }
  /* 顶冠光晕 */
  .orbit-halo {
    top: -140px;
    width: 460px;
    height: 460px;
    border-radius: 50%;
    background: radial-gradient(circle at center,
      rgba(255,255,255,.30) 0%,
      rgba(180,210,255,.20) 14%,
      rgba(120,170,255,.12) 30%,
      transparent 58%);
    filter: blur(10px);
    animation: halo-pulse 4s ease-in-out infinite;
    pointer-events: none;
  }
  .orbit-ring-outer {
    top: 13px;
    width: 520px;
    height: 280px;
    border-radius: 50%;
    border: 1px solid rgba(207, 227, 255, .14);
    filter: drop-shadow(0 0 14px rgba(122, 168, 255, .35));
    pointer-events: none;
  }
  .orbit-ring-inner {
    top: 36px;
    width: 420px;
    height: 230px;
    border-radius: 50%;
    border: 1px solid rgba(207, 227, 255, .12);
    pointer-events: none;
  }

  /* 光盘地面投影(叠加在 floor 上) */
  .projection-shadow {
    top: 124px;
    width: 680px;
    height: 220px;
    border-radius: 50%;
    opacity: .85;
    background: radial-gradient(ellipse at center,
      rgba(122,168,255,.30) 0%,
      rgba(80,140,255,.16) 28%,
      transparent 70%);
    filter: blur(22px) saturate(.8);
    transform: translateX(-50%) perspective(750px) rotateX(68deg);
    pointer-events: none;
  }

  /* 光盘旋转容器 */
  .disc-perspective {
    position: absolute;
    top: -75px;
    left: 50%;
    transform: translateX(-50%);
    width: 310px;
    height: 310px;
    perspective: 1000px;
  }
  @media (min-width: 640px) {
    .disc-perspective { width: 360px; height: 360px; }
  }
  .disc-plane {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    transform-style: preserve-3d;
    animation: disc-spin 26s linear infinite;
    will-change: transform;
  }
  /* 盘上流星轨道层:与盘同倾角(rotateX),不继承盘的 rotateZ 自转 -> 粒子独立环流 */
  .disc-orbit-field {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transform: rotateX(82deg);
    pointer-events: none;
  }

  /* 刻度环 */
  .disc-ticks {
    position: absolute;
    inset: 0;
    pointer-events: none;
    --tick-r: 118px;
  }
  @media (min-width: 640px) {
    .disc-ticks { --tick-r: 138px; }
  }
  .disc-tick {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 1px;
    height: 6px;
    margin-left: -0.5px;
    margin-top: -3px;
    background: rgba(143, 180, 255, .18);
    transform: rotate(var(--a)) translateY(calc(-1 * var(--tick-r)));
    transform-origin: center;
  }
  .disc-tick--major {
    height: 10px;
    margin-top: -5px;
    background: rgba(207, 227, 255, .36);
  }

  .disc-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(207, 227, 255, .22);
    box-shadow:
      inset 0 0 28px rgba(122, 168, 255, .10),
      0 0 30px rgba(122, 168, 255, .14);
  }
  .disc-ring--outer { inset: 7%; }
  .disc-ring--inner {
    inset: 22%;
    border-style: dashed;
    border-color: rgba(207, 227, 255, .16);
    opacity: .6;
  }
  .disc-core {
    position: absolute;
    left: 50%; top: 50%;
    width: 48px; height: 48px;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    border: 1px solid rgba(207, 227, 255, .3);
    background: var(--base-deep);
    box-shadow:
      0 0 18px rgba(122, 168, 255, .7),
      0 0 42px rgba(80, 140, 255, .4);
    display: flex; align-items: center; justify-content: center;
  }
  .disc-core-pulse {
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--frost);
    box-shadow:
      0 0 10px rgba(255,255,255,.9),
      0 0 22px 5px rgba(207, 227, 255, .7);
    animation: core-pulse 2s ease-in-out infinite;
  }

  /* ============ 盘上流星粒子 ============ */
  .disc-meteor {
    position: absolute;
    left: 50%;
    top: 50%;
    width: var(--size);
    height: var(--size);
    margin-left: calc(var(--size) / -2);
    margin-top:  calc(var(--size) / -2);
    border-radius: 999px;
    background: var(--color);
    box-shadow:
      0 0 4px  #ffffff,
      0 0 10px var(--color),
      0 0 22px color-mix(in srgb, var(--color) 70%, transparent),
      0 0 42px color-mix(in srgb, var(--color) 45%, transparent);
    transform: rotate(var(--orbit-a)) translateY(calc(-1 * var(--orbit-r))) rotate(180deg);
    animation: orbit-revolve var(--orbit-speed) linear infinite,
               meteor-twinkle var(--blink) ease-in-out infinite;
    animation-delay: var(--orbit-delay), var(--delay);
    will-change: transform, opacity, filter;
  }
  .disc-meteor::after {
    content: "";
    position: absolute;
    right: calc(var(--tail) * -1);
    top: 50%;
    width: var(--tail);
    height: 1px;
    transform: translateY(-50%);
    transform-origin: left;
    background: linear-gradient(90deg, var(--color), transparent);
    opacity: .6;
    pointer-events: none;
  }

  /* ============ 光点洒落(蓝白流星雨,3 层;自 StarCirclePortal 恢复) ============ */
  @keyframes rain-fall {
    0%   { transform: translate3d(0, -16px, 0) rotate(var(--tilt)) scale(.3); opacity: 0; }
    8%   { opacity: 1; }
    72%  { opacity: .8; }
    100% { transform: translate3d(var(--drift), 105vh, 0) rotate(var(--tilt)) scale(.4); opacity: 0; }
  }

  .rain-meteor {
    position: absolute;
    width: var(--dot-size);
    height: var(--dot-size);
    border-radius: 999px;
    background: var(--color);
    box-shadow:
      0 0 5px  var(--color),
      0 0 12px var(--color),
      0 0 24px color-mix(in srgb, var(--color) 55%, transparent);
    animation: rain-fall var(--duration) var(--ease-fall) infinite;
    animation-delay: var(--delay);
    will-change: transform, opacity;
  }
  .rain-meteor::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 50%;
    width: 2px;
    height: var(--tail-length);
    margin-left: -1px;
    background: linear-gradient(0deg, var(--color), transparent);
    filter: blur(.3px);
    opacity: var(--tail-opacity, .6);
    pointer-events: none;
  }
  /* 3 层:核心(中心区,最亮最白)/ 主(蓝白)/ 远(暗蓝) */
  .rain-meteor.tier-core { opacity: 1; }
  .rain-meteor.tier-main { opacity: .9; }
  .rain-meteor.tier-far  { opacity: .55; }

  .meteor-rain {
    position: absolute;
    top: 146px;
    left: 50%;
    width: 100%;
    height: calc(100vh - 146px);
    transform: translateX(-50%);
    overflow: visible;
    pointer-events: none;
    z-index: var(--z-rain);   /* 高于盘组件(--z-disc)、低于内容层(--z-content) */
    filter: brightness(1.5);
  }

  /* ============ Disc Responsive ============ */
  @media (max-width: 640px) {
    .orbit-halo       { width: 320px; height: 320px; top: -90px; }
    .orbit-ring-outer { width: 380px; height: 200px; }
    .orbit-ring-inner { width: 320px; height: 170px; }
    .projection-shadow{ width: 520px; height: 170px; top: 96px; }
    .disc-perspective { width: 260px; height: 260px; top: -55px; }
  }

  /* ============ L4 内容 ============ */
  .content-wrapper {
    position: relative;
    z-index: var(--z-content);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
  }

  .hero-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 24px;
    padding: clamp(140px, 20vh, 260px) 24px 64px;
  }
  .hero-section h1 {
    margin: 0;
    font-size: clamp(32px, 5.2vw, 62px);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.05;
    background: linear-gradient(180deg, #ffffff 0%, #b9cdf2 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .hero-section .brand-taglines {
    margin: 0;
    font-style: italic;
    letter-spacing: 0.05em;
    font-size: clamp(11px, 1.25vw, 14px);
    line-height: 1.7;
  }
  .hero-section .brand-taglines em {
    display: block;
    width: fit-content;
    margin: 0 auto;
    font-style: italic;
    /* 渐变蓝端提亮(#7aa8ff -> #9fc3ff):12-14px 小字悬于涡流蓝紫亮带,
       原蓝端对比随时跌破 4.5:1 */
    background: linear-gradient(90deg, #e8f1ff, #9fc3ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  /* 入场编排:涡流先就位(750ms),标题/标语/ASCENT 依次 60ms stagger */
  .enter {
    opacity: 0;
    animation: enter-rise 700ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }
  .hero-section h1             { animation-delay: 150ms; }
  .hero-section .brand-taglines{ animation-delay: 210ms; }
  .hero-section .dropdown      { animation-delay: 270ms; }
  @keyframes enter-rise {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  /* ============ Shiny CTA (ASCENT 触发钮) ============ */
  /* 载体适配:原纯黑底在 Vortex 纯黑背景上无对比,改为深蓝黑半透明玻璃底,
     流光边框机制不变;内衬线改蓝白以配合玻璃载体 */
  @property --gradient-angle {
    syntax: "<angle>";
    initial-value: 0deg;
    inherits: false;
  }
  @property --gradient-angle-offset {
    syntax: "<angle>";
    initial-value: 0deg;
    inherits: false;
  }
  @property --gradient-percent {
    syntax: "<percentage>";
    initial-value: 5%;
    inherits: false;
  }
  @property --gradient-shine {
    syntax: "<color>";
    initial-value: white;
    inherits: false;
  }

  .shiny-cta {
    --shiny-cta-bg: rgba(10, 14, 30, .65);
    --shiny-cta-bg-subtle: rgba(122, 168, 255, .28);
    --shiny-cta-fg: var(--frost);
    --shiny-cta-highlight: var(--accent);
    --shiny-cta-highlight-subtle: #8484ff;
    --animation: gradient-angle linear infinite;
    --duration: 3s;
    --shadow-size: 2px;
    --transition: 800ms cubic-bezier(0.25, 1, 0.5, 1);

    isolation: isolate;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    outline-offset: 4px;
    padding: 0.5rem 1.2rem;
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    font-size: 0.9375rem;
    line-height: 1.2;
    font-weight: 500;
    letter-spacing: 0.04em;
    border: 1px solid transparent;
    border-radius: 360px;
    color: var(--shiny-cta-fg);
    background:
      linear-gradient(var(--shiny-cta-bg), var(--shiny-cta-bg)) padding-box,
      conic-gradient(
        from calc(var(--gradient-angle) - var(--gradient-angle-offset)),
        transparent,
        var(--shiny-cta-highlight) var(--gradient-percent),
        var(--gradient-shine) calc(var(--gradient-percent) * 2),
        var(--shiny-cta-highlight) calc(var(--gradient-percent) * 3),
        transparent calc(var(--gradient-percent) * 4)
      ) border-box;
    box-shadow: inset 0 0 0 1px var(--shiny-cta-bg-subtle);
    transition: var(--transition);
    transition-property: --gradient-angle-offset, --gradient-percent, --gradient-shine;
  }
  .shiny-cta::before,
  .shiny-cta::after,
  .shiny-cta span::before {
    content: "";
    pointer-events: none;
    position: absolute;
    inset-inline-start: 50%;
    inset-block-start: 50%;
    translate: -50% -50%;
    z-index: -1;
  }
  .shiny-cta:active { translate: 0 1px; }

  .shiny-cta::before {
    --size: calc(100% - var(--shadow-size) * 3);
    --position: 2px;
    --space: calc(var(--position) * 2);
    width: var(--size);
    height: var(--size);
    background: radial-gradient(
      circle at var(--position) var(--position),
      white calc(var(--position) / 4),
      transparent 0
    ) padding-box;
    background-size: var(--space) var(--space);
    background-repeat: space;
    -webkit-mask-image: conic-gradient(
      from calc(var(--gradient-angle) + 45deg),
      black, transparent 10% 90%, black
    );
            mask-image: conic-gradient(
      from calc(var(--gradient-angle) + 45deg),
      black, transparent 10% 90%, black
    );
    border-radius: inherit;
    opacity: 0.4;
    z-index: -1;
  }

  .shiny-cta::after {
    --animation: shimmer linear infinite;
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(-50deg, transparent, var(--shiny-cta-highlight), transparent);
    -webkit-mask-image: radial-gradient(circle at bottom, transparent 40%, black);
            mask-image: radial-gradient(circle at bottom, transparent 40%, black);
    opacity: 0.6;
  }
  .shiny-cta span { z-index: 1; }

  .shiny-cta span::before {
    --size: calc(100% + 1rem);
    width: var(--size);
    height: var(--size);
    box-shadow: inset 0 -1ex 2rem 4px var(--shiny-cta-highlight);
    opacity: 0;
    transition: opacity var(--transition);
    animation: calc(var(--duration) * 1.5) breathe linear infinite;
  }

  .shiny-cta,
  .shiny-cta::before,
  .shiny-cta::after {
    animation:
      var(--animation) var(--duration),
      var(--animation) calc(var(--duration) / 0.4) reverse paused;
    animation-composition: add;
  }

  .shiny-cta:is(:hover, :focus-visible) {
    --gradient-percent: 20%;
    --gradient-angle-offset: 95deg;
    --gradient-shine: var(--shiny-cta-highlight-subtle);
    outline: none;
    backdrop-filter: blur(10px) saturate(140%);
    -webkit-backdrop-filter: blur(10px) saturate(140%);
  }
  .shiny-cta:is(:hover, :focus-visible),
  .shiny-cta:is(:hover, :focus-visible)::before,
  .shiny-cta:is(:hover, :focus-visible)::after {
    animation-play-state: running;
  }
  .shiny-cta:is(:hover, :focus-visible) span::before { opacity: 1; }

  @keyframes gradient-angle { to { --gradient-angle: 360deg; } }
  @keyframes shimmer { to { rotate: 360deg; } }
  @keyframes breathe {
    from, to { scale: 1; }
    50%      { scale: 1.2; }
  }

  .variant-blue   { --shiny-cta-highlight: #3b82f6; --shiny-cta-highlight-subtle: #93c5fd; }

  /* ============ ASCENT Dropdown ============ */
  .ascent-trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }
  .ascent-trigger .chev {
    width: 14px; height: 14px;
    opacity: .8;
    transition: transform 200ms cubic-bezier(0.16, 1, 0.3, 1), opacity 160ms ease;
  }
  .ascent-trigger[aria-expanded="true"] .chev {
    transform: rotate(180deg);
    opacity: 1;
  }

  .dropdown {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 24px;
  }

  /* 顶部细线把按钮和面板视觉连接 */
  .dropdown::before {
    content: "";
    position: absolute;
    left: 50%;
    top: calc(100% - 6px);
    width: 1px; height: 8px;
    background: linear-gradient(180deg, rgba(120,170,255,.45), transparent);
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 220ms cubic-bezier(0.16, 1, 0.3, 1) 80ms;
  }
  .dropdown.is-open::before { opacity: 1; }

  .dropdown-panel {
    position: relative;
    margin-top: 8px;
    width: max-content;
    min-width: 160px;
    background: rgba(10, 14, 30, .72);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border: 1px solid rgba(120, 170, 255, .22);
    border-radius: 14px;
    box-shadow:
      0 12px 36px rgba(0, 0, 0, .5),
      0 0 0 1px rgba(120, 170, 255, .04) inset,
      0 1px 0 rgba(255, 255, 255, .04) inset;
    padding: 6px;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    pointer-events: none;
    transition:
      opacity 200ms cubic-bezier(0.16, 1, 0.3, 1),
      max-height 260ms cubic-bezier(0.16, 1, 0.3, 1),
      transform 200ms cubic-bezier(0.16, 1, 0.3, 1);
    z-index: var(--z-float);
  }
  .dropdown-panel.is-open {
    opacity: 1;
    max-height: 320px;
    transform: translateY(0) scale(1);
    pointer-events: auto;
  }

  .dropdown-panel ul { list-style: none; margin: 0; padding: 0; }
  .dropdown-panel li + li { margin-top: 1px; }

  .dropdown-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 7px 11px;
    border-radius: 8px;
    color: rgba(220, 230, 250, .78);
    font-size: 12px;
    font-weight: 500;
    line-height: 1.3;
    letter-spacing: 0.02em;
    cursor: pointer;
    text-decoration: none;
    transition:
      background 140ms ease,
      color 140ms ease,
      transform 180ms cubic-bezier(0.16, 1, 0.3, 1);
    outline-offset: -2px;
    white-space: nowrap;
  }
  .dropdown-item:hover,
  .dropdown-item:focus-visible {
    background: rgba(80, 140, 255, .14);
    color: #ffffff;
  }
  .dropdown-item:focus-visible {
    box-shadow: 0 0 0 1px rgba(147, 197, 253, .55) inset;
  }
  .dropdown-item .arrow {
    width: 12px; height: 12px;
    color: rgba(150, 180, 220, .45);
    transition: transform 200ms cubic-bezier(0.16, 1, 0.3, 1), color 140ms ease;
    flex-shrink: 0;
  }
  .dropdown-item:hover .arrow,
  .dropdown-item:focus-visible .arrow {
    transform: translateX(3px);
    color: #cfe3ff;
  }

  /* 暂未开放(soon):禁用态--暗淡、不可点击、无 hover,避免误导 */
  .dropdown-item[data-status="soon"] {
    opacity: .4;
    cursor: default;
    pointer-events: none;
  }

  /* ============ Responsive ============ */
  @media (max-width: 720px) {
    .dropdown-panel { min-width: 180px; }
    .dropdown-item { font-size: 13px; padding: 8px 12px; }
  }

  /* ============ Mobile 竖屏:居中截取窗口 ============ */
  /* 设计为横屏构图;竖屏移动端不重排,而是把整幅横屏场景铺满视口高度、水平居中,
     两侧超出部分由 overflow 裁切 -> 中央列(光盘/光弦/标题/ASCENT)完整可见,
     两侧(远端光柱/网格边)作为氛围被裁掉;前景文字限定可视宽度,防被左右裁切。 */
  @media (max-width: 820px) and (orientation: portrait) {
    .scene,
    .content-wrapper {
      position: fixed;
      top: 0;
      left: 50%;
      right: auto;
      bottom: auto;
      width: calc(100vh * 16 / 9);
      height: 100vh;
      transform: translateX(-50%);
    }
    .hero-section h1,
    .hero-section .brand-taglines { max-width: 86vw; }
  }

  /* ============ Portal Switcher 静态兜底(平台规范 §5.1) ============
     file:// 或共享 JS 加载失败时,.portal-switcher 静态块降级渲染;
     共享 JS 加载后会以 .ha-dock 三层玻璃覆盖本块(自身 class 切换)。 */
  .portal-switcher {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    z-index: var(--z-float);
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 4px;
    border-radius: 999px;
    border: 1px solid rgba(120, 160, 220, .28);
    background: rgba(8, 12, 28, .55);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
  }
  .switch-opt {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: none;
    border-radius: 999px;
    background: transparent;
    color: rgba(207, 227, 255, .4);
    cursor: pointer;
    transition: color .25s ease, background .25s ease, box-shadow .25s ease;
  }
  .switch-opt svg { width: 20px; height: 20px; }
  .switch-opt:not(.on):hover,
  .switch-opt:not(.on):focus-visible {
    color: rgba(207, 227, 255, .85);
    outline: none;
  }
  .switch-opt.on {
    color: #ffffff;
    background: rgba(122, 168, 255, .16);
    box-shadow: 0 0 16px rgba(122, 168, 255, .35);
  }
  @media (max-width: 560px) {
    .portal-switcher { right: 12px; }
  }

  /* ============ Portal Dock 调色板(平台规范 §5.1) ============
     共享 dock 由 /platform-assets/portal-switcher.css 提供,本门户仅覆盖 --dock-*
     令牌:蓝白冷调与门户自身配色同族(--accent #7AA8FF / --accent-soft #CFE3FF)。 */
  body[data-portal="starcircle"] .ha-dock {
    --dock-glow: rgba(180, 210, 255, .55);
    --dock-tint: rgba(180, 210, 255, .14);
    --dock-edge: rgba(180, 210, 255, .40);
    --dock-icon: rgba(220, 235, 255, .92);
  }

  /* ============ Reduced Motion ============ */
  @media (prefers-reduced-motion: reduce) {
    .vortex-field { animation: none; }        /* JS 侧单帧渲染 */
    .enter        { animation: none; opacity: 1; }
    .disc-plane,
    .disc-core-pulse,
    .orbit-halo,
    .disc-meteor,
    .rain-meteor { animation: none !important; }
    .disc-meteor  { opacity: .55; }
    .rain-meteor  { opacity: .4; }
    .orbit-halo   { opacity: .2; }
    .shiny-cta, .shiny-cta::before, .shiny-cta::after,
    .shiny-cta span::before { animation: none !important; }
    .dropdown-panel { transition: none; }
    .ascent-trigger .chev,
    .dropdown-item .arrow { transition: none; }
  }