@charset "UTF-8";
/* ==========================================================================
   逐梦 · 倍速工具 — 官网样式表
   视觉体系：深空底色 / aurora 光晕 / 玻璃拟态 / 发丝描边 / 编辑级排版
   结构：01 tokens → 02 reset → 03 布局 → 04 氛围层 → 05 导航 → 06 按钮
        07 Hero → 08 跑马灯 → 09 数据条 → 10 区块标题 → 11 核心优势
        12 工作原理 → 13 机制面板 → 14 界面预览 → 15 热键/规格
        16 FAQ → 17 下载 → 18 页脚 → 19 浮层 → 20 揭示动画
        21 keyframes → 22 响应式 → 23 无障碍 / 降级
   ========================================================================== */

/* ==========================================================================
   01. 设计令牌
   ========================================================================== */
:root {
  /* 底色 */
  --bg-0: #04060c;
  --bg-1: #070c17;
  --bg-2: #0b1220;

  /* 文字 */
  --ink: #e9eefb;
  --ink-dim: #9db0cd;      /* 正文次级：对 --bg-0 约 9.2:1 */
  --ink-soft: #7d92b3;     /* 小号说明：对 --bg-0 约 6.4:1 */
  --ink-faint: #6b80a3;    /* 微标签 / 法务小字：对 --bg-0 约 5.0:1 */

  /* 品牌 */
  --cyan: #63d5ff;
  --blue: #2f5cff;
  --violet: #7c5cff;
  --green: #4ade9f;

  /* 描边 */
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  /* 渐变 */
  --grad: linear-gradient(120deg, #63d5ff 0%, #2f5cff 100%);
  /* 文字渐变主体保持青→蓝，紫色只在末端 12% 收一笔微光 */
  --grad-text: linear-gradient(
    104deg,
    #63d5ff 0%,
    #58b9ff 30%,
    #4a94ff 58%,
    #3f7bff 88%,
    #7c5cff 100%
  );
  /* 主按钮渐变刻意抬亮蓝端：末端 #5a86ff 对深色字 #04101f 实测 ≈5.7:1，整条渐变均 ≥ 5:1 */
  --grad-btn: linear-gradient(120deg, #63d5ff 0%, #4f8dff 55%, #5a86ff 100%);

  /* 玻璃 / 阴影 */
  --glass: rgba(10, 16, 29, 0.66);
  --shadow-card: 0 24px 60px -36px rgba(0, 0, 0, 0.9);
  --shadow-float: 0 30px 80px -40px rgba(0, 0, 0, 0.95);

  /* 字体 */
  --font-sans: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei UI",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Cascadia Mono", "Cascadia Code", ui-monospace, "SF Mono",
    Consolas, "Liberation Mono", monospace;

  /* 节奏 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-io: cubic-bezier(0.65, 0.05, 0.36, 1);
  --header-h: 74px;
  --container: min(1200px, 92vw);

  /* 安全区 */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

/* ==========================================================================
   02. Reset + 基础排版
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(157, 176, 205, 0.28) transparent;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-0);
  color: var(--ink);
  color-scheme: dark;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  font-weight: 400;
  letter-spacing: 0.005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

img,
svg {
  vertical-align: middle;
}

img {
  max-width: 100%;
  height: auto;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
}

b,
strong {
  font-weight: 600;
}

::selection {
  background: rgba(99, 213, 255, 0.28);
  color: #f4f9ff;
  text-shadow: none;
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 11px;
  height: 11px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border: 3px solid var(--bg-0);
  border-radius: 999px;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.22);
  background-clip: padding-box;
  border: 3px solid var(--bg-0);
}

/* ==========================================================================
   03. 布局骨架
   ========================================================================== */
.container {
  width: var(--container);
  margin-inline: auto;
}

main {
  position: relative;
  z-index: 1;
  display: block;
}

.section {
  position: relative;
  padding-block: clamp(88px, 10vw, 148px);
}

/* 区块之间的发丝分隔：中部实、两端淡出 */
.section + .section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  translate: -50% 0;
  width: var(--container);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--line) 12%,
    var(--line-strong) 50%,
    var(--line) 88%,
    transparent 100%
  );
  pointer-events: none;
}

section[id],
footer {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

/* 语义化区块钩子（锚点与节奏），同时也方便后续单独调节某个区块 */
.features,
.how,
.ui,
.hotkeys,
.faq,
.download {
  scroll-margin-top: calc(var(--header-h) + 18px);
}

/* ==========================================================================
   04. 氛围层：aurora / 网格 / 星尘 / 颗粒
   ========================================================================== */
.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  background:
    radial-gradient(ellipse 90% 55% at 50% -12%, rgba(47, 92, 255, 0.1), transparent 62%),
    linear-gradient(180deg, #05070d 0%, var(--bg-0) 42%, #04060b 100%);
}

.aurora {
  position: absolute;
  border-radius: 50%;
  /* 半径从 90px 收到 64px：视觉几乎无差，但首帧光栅化与合成开销明显下降 */
  filter: blur(64px);
  opacity: 0.85;
  will-change: transform;
}

.aurora--one {
  width: min(1120px, 86vw);
  height: min(1120px, 86vw);
  top: -40%;
  left: -20%;
  background: radial-gradient(
    circle at 42% 42%,
    rgba(47, 92, 255, 0.3) 0%,
    rgba(47, 92, 255, 0.08) 46%,
    transparent 68%
  );
  animation: aurora-one 26s var(--ease-io) infinite alternate;
}

.aurora--two {
  width: min(880px, 68vw);
  height: min(880px, 68vw);
  top: -22%;
  right: -22%;
  background: radial-gradient(
    circle at 52% 46%,
    rgba(99, 213, 255, 0.17) 0%,
    rgba(99, 213, 255, 0.05) 44%,
    transparent 66%
  );
  animation: aurora-two 34s var(--ease-io) infinite alternate;
}

.aurora--three {
  width: min(1020px, 82vw);
  height: min(1020px, 82vw);
  bottom: -44%;
  left: 20%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(124, 92, 255, 0.17) 0%,
    rgba(124, 92, 255, 0.04) 46%,
    transparent 68%
  );
  animation: aurora-three 40s var(--ease-io) infinite alternate;
}

/* 1px 网格，顶部亮、四周由 mask 淡出 */
.grid-veil {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.045) 0 1px, transparent 1px 72px);
  -webkit-mask-image: radial-gradient(ellipse 88% 62% at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse 88% 62% at 50% 0%, #000 0%, transparent 72%);
  opacity: 0.55;
}

/* 颗粒：用 96×96 的 PNG 噪点平铺（feTurbulence 在软件光栅化下要花 ~200ms 首帧） */
.grain {
  position: absolute;
  inset: 0;
  background-image: url("../img/noise.png");
  background-size: 96px 96px;
  opacity: 0.045;
  mix-blend-mode: overlay;
}

.starfield {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0.6;
}

/* 全局光标光晕
   JS 约定：main.js 会接管 left/top/margin，并检查本元素的 computed transform。
   这里用 transform 居中自身，JS 便走「自己接管 transform」分支，用
   translate3d(calc(x - 50%), calc(y - 50%)) 移动；无 JS 时整层直接隐藏。 */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 60;
  width: 560px;
  height: 560px;
  margin: 0;
  border-radius: 50%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(99, 213, 255, 0.09) 0%,
    rgba(47, 92, 255, 0.05) 36%,
    transparent 68%
  );
  transform: translate(-50%, -50%);
  pointer-events: none;
  will-change: transform;
}

html.js .cursor-glow {
  opacity: 1;
}

html:not(.js) .cursor-glow {
  display: none;
}

/* 顶部阅读进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 80;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--blue) 58%, var(--violet) 100%);
  box-shadow: 0 0 14px rgba(99, 213, 255, 0.45);
  border-radius: 0 2px 2px 0;
  pointer-events: none;
  transition: width 0.1s linear;
}

/* 跳转链接：仅键盘聚焦时出现 */
.skip-link {
  position: fixed;
  top: max(14px, var(--safe-top));
  left: max(14px, var(--safe-left));
  z-index: 100;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border-radius: 10px;
  background: var(--cyan);
  color: #04101f;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 12px 32px -12px rgba(99, 213, 255, 0.6);
  transform: translateY(-180%);
  transition: transform 0.26s var(--ease-out);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 3px;
}

/* ==========================================================================
   05. 顶部导航
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  padding-top: var(--safe-top);
  /* 注意：模糊背景放在 ::before 上，避免 header 自身因 filter/backdrop-filter
     成为 fixed 子元素（移动端抽屉）的包含块 */
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: transparent;
  border-bottom: 1px solid transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transition: background-color 0.36s ease, border-color 0.36s ease,
    backdrop-filter 0.36s ease, -webkit-backdrop-filter 0.36s ease;
}

.site-header.is-scrolled::before {
  background: rgba(4, 7, 13, 0.72);
  border-bottom-color: var(--line);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  box-shadow: 0 18px 44px -30px rgba(0, 0, 0, 0.9);
}

.header-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(16px, 2.4vw, 30px);
  height: var(--header-h);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
  border-radius: 10px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1), 0 8px 22px -10px rgba(47, 92, 255, 0.75);
  transition: box-shadow 0.35s var(--ease-out);
}

.brand-mark img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand:hover .brand-mark {
  box-shadow: 0 0 0 1px rgba(99, 213, 255, 0.4), 0 10px 28px -10px rgba(99, 213, 255, 0.7);
}

.brand-text {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  white-space: nowrap;
}

.brand-text strong {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.brand-sub {
  padding-left: 9px;
  border-left: 1px solid var(--line-strong);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}

/* 桌面横排导航 */
.site-nav {
  display: flex;
  justify-self: center;
  align-items: center;
  gap: 2px;
}

.site-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-dim);
  white-space: nowrap;
  transition: color 0.3s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 30%, var(--cyan) 70%, transparent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.36s var(--ease-out);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  justify-self: end;
  gap: 10px;
}

/* 移动端汉堡 */
.nav-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 11px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.035);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.36s var(--ease-out), opacity 0.26s ease;
}

.nav-toggle:hover {
  border-color: rgba(255, 255, 255, 0.26);
  background: rgba(255, 255, 255, 0.06);
}

.site-header.nav-open .nav-toggle span:nth-child(1) {
  transform: translateY(3.25px) rotate(45deg);
}

.site-header.nav-open .nav-toggle span:nth-child(2) {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* ==========================================================================
   06. 按钮体系
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: translate 0.32s var(--ease-out), background-color 0.32s ease,
    border-color 0.32s ease, box-shadow 0.42s var(--ease-out), color 0.32s ease;
}

.btn .ico {
  width: 19px;
  height: 19px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn:hover {
  translate: 0 -1px;
}

.btn:active {
  translate: 0 0;
}

.btn-primary {
  color: #04101f;
  background: var(--grad-btn);
  box-shadow: 0 12px 32px -14px rgba(47, 92, 255, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.42);
}

.btn-primary:hover {
  box-shadow: 0 18px 42px -16px rgba(99, 213, 255, 0.42),
    0 10px 30px -14px rgba(47, 92, 255, 0.7),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.btn-primary .btn-meta {
  /* 不透明深色：小字也需要 ≥4.5:1，半透明会让它在渐变末端掉到 3.8:1 */
  color: #04101f;
}

.btn-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.035);
  border-color: var(--line-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.24);
  box-shadow: 0 14px 36px -24px rgba(0, 0, 0, 0.9);
}

.btn-sm {
  min-height: 38px;
  padding: 8px 15px;
  gap: 7px;
  font-size: 13.5px;
}

.btn-sm .ico {
  width: 16px;
  height: 16px;
}

.btn-lg {
  min-height: 54px;
  padding: 14px 24px;
  font-size: 16px;
}

.btn-lg .ico {
  width: 20px;
  height: 20px;
}

.btn-xl {
  min-height: 62px;
  padding: 0 30px;
  gap: 12px;
  font-size: 17.5px;
}

.btn-xl .ico {
  width: 21px;
  height: 21px;
}

.btn-meta {
  font-size: 0.78em;
  font-weight: 600;
  letter-spacing: 0.02em;
  opacity: 1;
  padding-left: 2px;
}

/* ==========================================================================
   07. Hero
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: min(92vh, 900px);
  padding-top: calc(var(--header-h) + var(--safe-top) + clamp(24px, 3.6vw, 48px));
  padding-bottom: clamp(30px, 4vw, 48px);
}

.hero-halo {
  position: absolute;
  top: -16%;
  left: 50%;
  translate: -50% 0;
  width: min(1180px, 108vw);
  height: min(760px, 74vw);
  background: radial-gradient(
    ellipse at 50% 46%,
    rgba(47, 92, 255, 0.24) 0%,
    rgba(99, 213, 255, 0.08) 38%,
    transparent 68%
  );
  filter: blur(44px);
  opacity: 0.9;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: clamp(48px, 6vw, 88px);
}

.hero-copy {
  min-width: 0;
  max-width: 620px;
}

/* 小胶囊 eyebrow */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 7px 15px 7px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
  white-space: nowrap;
}

.pulse-dot {
  position: relative;
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse-dot 2.8s ease-out infinite;
}

.hero-title {
  margin-top: clamp(20px, 2.4vw, 28px);
  font-size: clamp(2.5rem, 5.6vw, 4.9rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
}

.grad-text {
  color: var(--cyan);
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  padding-right: 0.04em;
}

@supports not ((background-clip: text) or (-webkit-background-clip: text)) {
  .grad-text {
    color: var(--cyan);
    -webkit-text-fill-color: currentColor;
    background: none;
  }
}

.hero-lead {
  margin-top: clamp(20px, 2.4vw, 26px);
  max-width: 54ch;
  font-size: clamp(16px, 1.15vw, 17.5px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.hero-lead strong {
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(28px, 3.4vw, 40px);
}

/* Hero 底部三列事实 */
.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(28px, 3.4vw, 42px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.hero-facts li {
  min-width: 0;
  padding-inline: clamp(14px, 2vw, 26px);
}

.hero-facts li:first-child {
  padding-left: 0;
}

.hero-facts li + li {
  border-left: 1px solid var(--line);
}

.fact-k {
  display: block;
  font-size: clamp(14px, 1.1vw, 15px);
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.fact-v {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--ink-dim);
  /* 1024 档避免 ".NET Framework 4.x" 在 4.x 前折行导致三列基线不齐 */
  white-space: nowrap;
}

/* --- Hero 右侧舞台 --- */
.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
}

.orb-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: min(440px, 100%);
  aspect-ratio: 1 / 1;
  transform-style: preserve-3d;
  transition: transform 0.5s var(--ease-out);
}

.orb-stage::before {
  content: "";
  position: absolute;
  inset: 2%;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.055);
  pointer-events: none;
}

.orb-stage::after {
  content: "";
  position: absolute;
  inset: 10%;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 48%, rgba(47, 92, 255, 0.2), transparent 64%);
  filter: blur(30px);
  pointer-events: none;
}

.orb {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 76%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(99, 213, 255, 0.18);
  background: radial-gradient(
    circle at 34% 26%,
    rgba(99, 213, 255, 0.24) 0%,
    rgba(47, 92, 255, 0.16) 42%,
    rgba(10, 17, 31, 0.72) 76%
  );
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.28), 0 34px 100px -24px rgba(47, 92, 255, 0.65),
    0 0 70px -12px rgba(99, 213, 255, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -24px 64px rgba(4, 8, 16, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  animation: orb-float 8s ease-in-out infinite;
  will-change: transform;
}

.orb::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(circle at 32% 20%, rgba(255, 255, 255, 0.16), transparent 46%);
  pointer-events: none;
}

/* 图标：缩到 64%，用青色 hairline + 外发光把「方块」融进能量球 */
.orb img {
  position: relative;
  z-index: 1;
  display: block;
  width: 64%;
  height: auto;
  border-radius: 28%;
  border: 1px solid rgba(99, 213, 255, 0.34);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.5), 0 26px 64px -20px rgba(0, 0, 0, 0.95),
    0 0 70px rgba(99, 213, 255, 0.26);
}

/* 两圈 conic 细环：外圈 20s 顺时针，内圈 34s 逆时针 */
.orb-ring {
  position: absolute;
  z-index: 1;
  border-radius: 50%;
  pointer-events: none;
  background: conic-gradient(
    from 0deg,
    transparent 0deg,
    rgba(99, 213, 255, 0.9) 52deg,
    rgba(99, 213, 255, 0.12) 108deg,
    transparent 150deg,
    transparent 224deg,
    rgba(124, 92, 255, 0.75) 282deg,
    rgba(124, 92, 255, 0.1) 322deg,
    transparent 360deg
  );
  -webkit-mask-image: radial-gradient(
    farthest-side,
    transparent calc(100% - 1.5px),
    #000 calc(100% - 1.4px)
  );
  mask-image: radial-gradient(
    farthest-side,
    transparent calc(100% - 1.5px),
    #000 calc(100% - 1.4px)
  );
}

.orb-ring--outer {
  inset: 0;
  animation: spin 20s linear infinite;
  opacity: 0.8;
}

.orb-ring--inner {
  inset: 9%;
  animation: spin 34s linear infinite reverse;
  opacity: 0.5;
}

.orb-beam {
  position: absolute;
  z-index: 1;
  top: 30%;
  left: -12%;
  width: 124%;
  height: 46%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(99, 213, 255, 0.2) 34%,
    rgba(255, 255, 255, 0.16) 52%,
    rgba(47, 92, 255, 0.18) 70%,
    transparent 100%
  );
  filter: blur(18px);
  transform: rotate(-24deg);
  mix-blend-mode: screen;
  opacity: 0;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 16%, transparent 72%);
  mask-image: radial-gradient(ellipse at center, #000 16%, transparent 72%);
  animation: beam-sweep 9s ease-in-out infinite;
}

/* 悬浮玻璃小卡 */
.float-card {
  position: absolute;
  z-index: 3;
  padding: 13px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  background: linear-gradient(160deg, rgba(16, 24, 40, 0.74), rgba(8, 13, 24, 0.64));
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow: var(--shadow-float), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  animation: card-float 7s ease-in-out infinite;
  will-change: transform;
}

.float-card--speed {
  right: -3%;
  bottom: 5%;
  width: 172px;
  animation-delay: -2s;
}

.float-card--hook {
  left: -7%;
  top: 13%;
  width: 198px;
  animation: card-float 9s ease-in-out infinite -4s reverse;
}

.float-card-top {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.09em;
  color: var(--ink-dim);
  white-space: nowrap;
}

.dot {
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
}

.dot--live {
  background: var(--cyan);
  animation: pulse-dot 2.4s ease-out infinite;
}

.dot--ok {
  background: var(--green);
  box-shadow: 0 0 8px rgba(74, 222, 159, 0.8);
}

.speed-readout {
  display: flex;
  align-items: baseline;
  gap: 3px;
  margin-top: 5px;
}

.speed-num {
  font-size: 38px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.speed-x {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
}

.speed-meter {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 18px;
  margin-top: 10px;
}

.speed-meter span {
  flex: 1;
  height: 30%;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.1);
  transition: background-color 0.35s ease, box-shadow 0.35s ease, height 0.35s ease;
}

.speed-meter span:nth-child(1) { height: 30%; }
.speed-meter span:nth-child(2) { height: 46%; }
.speed-meter span:nth-child(3) { height: 64%; }
.speed-meter span:nth-child(4) { height: 40%; }
.speed-meter span:nth-child(5) { height: 78%; }
.speed-meter span:nth-child(6) { height: 56%; }
.speed-meter span:nth-child(7) { height: 92%; }
.speed-meter span:nth-child(8) { height: 68%; }

.speed-meter span.is-on {
  background: linear-gradient(180deg, var(--cyan) 0%, var(--blue) 100%);
  box-shadow: 0 0 10px rgba(99, 213, 255, 0.55);
}

.hook-list {
  display: grid;
  gap: 5px;
  margin-top: 9px;
}

.hook-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--ink-dim);
  white-space: nowrap;
}

.hook-list li::before {
  content: "";
  width: 4px;
  height: 4px;
  flex: none;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 7px rgba(74, 222, 159, 0.75);
}

/* ==========================================================================
   08. Hero 底部跑马灯
   ========================================================================== */
.hero-strip {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 36px);
  margin-top: clamp(30px, 4.4vw, 56px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.strip-label {
  flex: none;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  white-space: nowrap;
}

.marquee {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  /* 两端软化：左侧 fragment 不会以硬边突然出现 */
  -webkit-mask-image: linear-gradient(
    90deg,
    transparent 0%,
    #000 8%,
    #000 92%,
    transparent 100%
  );
  mask-image: linear-gradient(
    90deg,
    transparent 0%,
    #000 8%,
    #000 92%,
    transparent 100%
  );
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 30px);
  width: max-content;
  animation: marquee 40s linear infinite;
  will-change: transform;
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

.marquee-track span {
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
  white-space: nowrap;
}

.marquee-track i {
  font-style: normal;
  font-size: 13px;
  color: rgba(99, 213, 255, 0.55);
}

/* ==========================================================================
   09. 数据条
   ========================================================================== */
.stats {
  position: relative;
  z-index: 1;
  padding-block: clamp(38px, 4.6vw, 54px);
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.016), transparent 78%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat {
  min-width: 0;
  padding-inline: clamp(16px, 2.6vw, 38px);
}

.stat:first-child {
  padding-left: 0;
}

.stat + .stat {
  border-left: 1px solid var(--line);
}

.stat-num {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-size: clamp(3rem, 4.2vw, 3.75rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.unit {
  font-size: 0.34em;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--cyan);
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@supports not ((background-clip: text) or (-webkit-background-clip: text)) {
  .unit {
    color: var(--cyan);
    -webkit-text-fill-color: currentColor;
    background: none;
  }
}

.stat-label {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--ink-dim);
}

/* ==========================================================================
   10. 区块标题
   ========================================================================== */
.section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  max-width: 840px;
  margin-bottom: clamp(44px, 5.5vw, 72px);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
  white-space: nowrap;
}

.section-kicker span {
  margin-right: 12px;
  padding-right: 12px;
  border-right: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.section-title {
  font-size: clamp(1.85rem, 3.3vw, 2.9rem);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-wrap: balance;
}

.section-lead {
  max-width: 62ch;
  font-size: clamp(16px, 1.15vw, 17.5px);
  line-height: 1.85;
  color: var(--ink-dim);
}

.section-lead--tight {
  max-width: 42ch;
  padding-bottom: 4px;
  font-size: clamp(15px, 1.05vw, 16.5px);
}

/* 标题分栏：左标题 + 右导语 */
.section-head--split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: end;
  gap: clamp(24px, 4vw, 64px);
  max-width: none;
  margin-bottom: clamp(40px, 4.6vw, 64px);
}

.section-head--split > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.section-head--left {
  max-width: 580px;
  margin-bottom: clamp(28px, 3.2vw, 38px);
}

/* ==========================================================================
   11. 核心优势
   ========================================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 1.6vw, 22px);
}

.card {
  position: relative;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018));
  overflow: hidden;
  transition: translate 0.45s var(--ease-out), border-color 0.45s ease,
    background-color 0.45s ease, box-shadow 0.45s var(--ease-out);
}

/* 静态径向高光放右上角，悬停时点亮 */
.card--feature::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(
    620px circle at 84% -8%,
    rgba(99, 213, 255, 0.14) 0%,
    rgba(47, 92, 255, 0.06) 34%,
    transparent 64%
  );
  opacity: 0.55;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.card--feature {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: clamp(24px, 2.3vw, 32px);
}

.card--feature:hover {
  translate: 0 -4px;
  border-color: rgba(99, 213, 255, 0.26);
  box-shadow: 0 26px 60px -42px rgba(0, 0, 0, 0.95),
    0 0 0 1px rgba(99, 213, 255, 0.05) inset;
}

.card--feature:hover::before {
  opacity: 1;
}

.card-ico {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: none;
  margin-bottom: clamp(18px, 2vw, 24px);
  border: 1px solid rgba(99, 213, 255, 0.22);
  border-radius: 13px;
  background: linear-gradient(160deg, rgba(99, 213, 255, 0.14), rgba(47, 92, 255, 0.08));
  color: #9de6ff;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.card-ico svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card--feature:hover .card-ico {
  color: var(--cyan);
  border-color: rgba(99, 213, 255, 0.4);
  box-shadow: 0 0 26px -6px rgba(99, 213, 255, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.card--feature h3 {
  font-size: 19.5px;
  font-weight: 650;
  line-height: 1.35;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.card--feature p {
  margin-top: 10px;
  font-size: 14.8px;
  line-height: 1.82;
  color: var(--ink-dim);
}

/* 横跨整行的宽卡（3 列网格里占满一行，避免右侧留空洞） */
.card--wide {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: clamp(18px, 2vw, 28px);
}

.card--wide .card-ico {
  margin-bottom: 0;
}

.card-wide-body {
  min-width: 0;
  max-width: 100ch;
}

.card-wide-body p {
  margin-top: 10px;
  max-width: 92ch;
}

.tag {
  position: relative;
  top: -1px;
  display: inline-flex;
  align-items: center;
  height: 20px;
  margin-left: 8px;
  padding: 0 8px;
  border: 1px solid rgba(99, 213, 255, 0.3);
  border-radius: 999px;
  background: rgba(99, 213, 255, 0.08);
  color: #9de6ff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  vertical-align: middle;
}

/* ==========================================================================
   12. 工作原理 / 三步
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 40px);
  margin-bottom: clamp(48px, 6vw, 88px);
}

.step {
  position: relative;
  min-width: 0;
  padding-top: 28px;
  border-top: 1px solid var(--line-strong);
}

/* 连接节点 + 顶部一段渐亮连线 */
.step::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(99, 213, 255, 0.1), 0 0 14px rgba(99, 213, 255, 0.5);
  transition: box-shadow 0.4s ease;
}

.step::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(99, 213, 255, 0.5), transparent 72%);
  opacity: 0.35;
  transition: opacity 0.4s ease;
}

.step:hover::after {
  opacity: 1;
}

.step:hover::before {
  box-shadow: 0 0 0 5px rgba(99, 213, 255, 0.14), 0 0 20px rgba(99, 213, 255, 0.7);
}

.step-index {
  font-family: var(--font-mono);
  font-size: clamp(48px, 4.6vw, 64px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(157, 176, 205, 0.18);
  font-variant-numeric: tabular-nums;
  background: linear-gradient(
    180deg,
    rgba(207, 233, 255, 0.9) 0%,
    rgba(99, 213, 255, 0.5) 58%,
    rgba(47, 92, 255, 0.12) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0.68;
  transition: opacity 0.4s ease;
}

.step:hover .step-index {
  opacity: 1;
}

@supports not ((background-clip: text) or (-webkit-background-clip: text)) {
  .step-index {
    color: rgba(157, 176, 205, 0.3);
    -webkit-text-fill-color: currentColor;
    background: none;
  }
}

.step h3 {
  margin-top: 20px;
  font-size: 20px;
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.step p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

/* ==========================================================================
   13. 机制玻璃面板
   ========================================================================== */
.mech {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 5vw, 72px);
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.012));
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.mech::before {
  content: "";
  position: absolute;
  top: -60%;
  left: -10%;
  width: 60%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 92, 255, 0.16), transparent 66%);
  filter: blur(28px);
  pointer-events: none;
}

.mech-head {
  position: relative;
  min-width: 0;
}

.mech-head h3 {
  font-size: clamp(1.3rem, 1.9vw, 1.65rem);
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.mech-head p {
  margin-top: 14px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-dim);
}

.mech-list {
  position: relative;
  min-width: 0;
  border-top: 1px solid var(--line);
}

.mech-list li {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.mech-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.mech-list code {
  justify-self: start;
  max-width: 100%;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(4, 8, 16, 0.55);
  font-size: 12.5px;
  letter-spacing: 0;
  color: #a8d9ff;
  /* 1024 档列宽较窄：允许折行，保证函数名完整可读（不再用省略号吞字） */
  white-space: normal;
  overflow-wrap: anywhere;
}

.mech-list span {
  min-width: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ==========================================================================
   14. 界面预览
   ========================================================================== */
.ui-showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr);
  align-items: center;
  gap: clamp(36px, 4vw, 60px);
}

.ui-frame {
  position: relative;
  z-index: 1;
  margin: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  background: linear-gradient(160deg, #0d1524, #070c16);
  box-shadow: 0 40px 100px -44px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(0, 0, 0, 0.45),
    0 0 80px -26px rgba(47, 92, 255, 0.32);
  overflow: hidden;
  isolation: isolate;
}

/* 顶部 1px 高光，压住浅色截图外沿 */
.ui-frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  z-index: 2;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.38), transparent);
  pointer-events: none;
}

.ui-frame-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  height: 38px;
  padding-inline: 14px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018));
}

.ui-dots {
  position: absolute;
  left: 14px;
  top: 50%;
  translate: 0 -50%;
  display: flex;
  gap: 6px;
}

.ui-dots i {
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.ui-frame-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding-inline: 64px;
}

.ui-frame-body {
  background: #071020;
  line-height: 0;
}

.ui-frame-body img {
  display: block;
  width: 100%;
  height: auto;
}

.ui-frame-caption {
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-align: center;
}

.ui-points {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.ui-point {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
}

.ui-point:first-child {
  padding-top: 0;
}

.ui-point:last-child {
  padding-bottom: 0;
}

.ui-point + .ui-point {
  border-top: 1px solid var(--line);
}

.ui-point-idx {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.85;
}

.ui-point h3 {
  font-size: 16.5px;
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.ui-point p {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ==========================================================================
   15. 热键 + 系统规格
   ========================================================================== */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  align-items: start;
  gap: clamp(40px, 4.5vw, 56px);
}

.split-main,
.split-side {
  min-width: 0;
}

.hotkey-table {
  border-top: 1px solid var(--line-strong);
}

.hotkey-row {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.35s ease;
}

.hotkey-row--head {
  padding: 11px 0;
  border-bottom-color: var(--line-strong);
}

.hotkey-row--head span {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.hotkey-row [role="cell"]:first-child {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.hotkey-row [role="cell"]:last-child {
  font-size: 14px;
  letter-spacing: 0.01em;
  color: var(--ink-dim);
}

.hotkey-row:hover {
  border-bottom-color: var(--line-strong);
}

/* 键帽 */
kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  padding: 2px 8px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-bottom-color: rgba(255, 255, 255, 0.26);
  border-radius: 7px;
  background: linear-gradient(180deg, #151d2e, #0b1220);
  color: #dbe6fa;
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 2px 0 rgba(0, 0, 0, 0.35);
  transition: border-color 0.3s ease, color 0.3s ease;
}

.hotkey-row:hover kbd {
  border-color: rgba(99, 213, 255, 0.28);
  color: #f2f8ff;
}

.plus {
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
}

/* 规格玻璃卡 */
.spec-card {
  padding: clamp(22px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.015));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
}

.spec-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.spec-card h3::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(99, 213, 255, 0.6);
}

.spec-list > div {
  display: grid;
  grid-template-columns: 5.2em minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
}

.spec-list dt {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.spec-list dd {
  min-width: 0;
  color: var(--ink-dim);
  overflow-wrap: break-word;
}

.spec-list code {
  display: inline-block;
  max-width: 100%;
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(4, 8, 16, 0.5);
  color: #9ddcf7;
  font-size: 11.5px;
  line-height: 1.6;
  word-break: break-all;
}

/* ==========================================================================
   16. FAQ
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 920px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.022);
  overflow: hidden;
  transition: border-color 0.35s ease, background-color 0.35s ease;
}

.faq-item:hover {
  border-color: var(--line-strong);
}

.faq-item[open] {
  border-color: rgba(255, 255, 255, 0.11);
  background: rgba(255, 255, 255, 0.032);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 19px clamp(18px, 2.2vw, 26px);
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--ink);
  transition: color 0.3s ease;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::marker {
  content: "";
}

.faq-item:hover summary {
  color: #ffffff;
}

.faq-q {
  min-width: 0;
}

/* 两条线组成 + / − */
.faq-ico {
  position: relative;
  width: 18px;
  height: 18px;
  flex: none;
  color: var(--ink-dim);
  transition: transform 0.38s var(--ease-out), color 0.3s ease;
}

.faq-ico::before,
.faq-ico::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.38s var(--ease-out), opacity 0.28s ease;
}

.faq-ico::before {
  transform: translate(-50%, -50%);
}

.faq-ico::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item[open] .faq-ico {
  transform: rotate(180deg);
  color: var(--cyan);
}

.faq-item[open] .faq-ico::after {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(90deg) scaleX(0.2);
}

.faq-a {
  padding: 0 clamp(18px, 2.2vw, 26px) 22px;
  max-width: 80ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-dim);
}

.faq-a p + p,
.faq-a p + ul,
.faq-a ul + p {
  margin-top: 12px;
}

.faq-a code {
  padding: 1px 6px;
  border: 1px solid rgba(99, 213, 255, 0.16);
  border-radius: 5px;
  background: rgba(99, 213, 255, 0.06);
  color: #9ddcf7;
  font-size: 12.5px;
  overflow-wrap: anywhere;
}

.faq-a b {
  color: var(--ink);
  font-weight: 600;
}

/* 青色小勾列表 */
.tick-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 12px;
}

.tick-list li {
  position: relative;
  padding-left: 21px;
  font-size: 14.5px;
  line-height: 1.85;
}

.tick-list li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 2px;
  width: 7px;
  height: 4px;
  border-left: 1.5px solid var(--cyan);
  border-bottom: 1.5px solid var(--cyan);
  border-radius: 0.5px;
  transform: rotate(-45deg);
  opacity: 0.8;
}

/* details 原生开合动画：渐进增强，不支持时保持原生切换 */
@supports (interpolate-size: allow-keywords) {
  :root {
    interpolate-size: allow-keywords;
  }

  .faq-item::details-content {
    block-size: 0;
    overflow: clip;
    transition: block-size 0.42s var(--ease-out), content-visibility 0.42s;
    transition-behavior: allow-discrete;
  }

  .faq-item[open]::details-content {
    block-size: auto;
  }
}

/* ==========================================================================
   17. 下载
   ========================================================================== */
.download-card {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
  gap: clamp(32px, 5vw, 64px);
  padding: clamp(26px, 4vw, 52px);
  border: 1px solid var(--line);
  border-radius: 26px;
  background: linear-gradient(155deg, rgba(15, 23, 40, 0.88), rgba(8, 13, 24, 0.92));
  box-shadow: 0 50px 130px -70px rgba(47, 92, 255, 0.55),
    0 0 0 1px rgba(0, 0, 0, 0.35) inset;
  overflow: hidden;
}

/* 渐变描边（mask 挖空中心，只留 1px 环） */
.download-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  padding: 1px;
  border-radius: inherit;
  background: linear-gradient(
    140deg,
    rgba(99, 213, 255, 0.55) 0%,
    rgba(255, 255, 255, 0.07) 30%,
    rgba(47, 92, 255, 0.3) 64%,
    rgba(124, 92, 255, 0.4) 100%
  );
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0.85;
  pointer-events: none;
}

.download-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 12%;
  right: 12%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.32), transparent);
  opacity: 0.5;
  pointer-events: none;
}

.download-glow {
  position: absolute;
  z-index: 0;
  top: -45%;
  right: -12%;
  width: 64%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(
    circle at 50% 50%,
    rgba(47, 92, 255, 0.34) 0%,
    rgba(99, 213, 255, 0.1) 42%,
    transparent 68%
  );
  filter: blur(40px);
  pointer-events: none;
}


.download-main,
.download-side {
  position: relative;
  z-index: 2;
  min-width: 0;
}

.download-head {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.2vw, 22px);
}

.download-icon {
  display: block;
  width: 72px;
  height: 72px;
  flex: none;
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  box-shadow: 0 18px 44px -18px rgba(0, 0, 0, 0.95),
    0 0 40px -10px rgba(47, 92, 255, 0.35);
}

.download-title {
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.download-sub {
  margin-top: 7px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

.download-actions .btn-ghost {
  min-height: 54px;
  padding-inline: 22px;
}

/* 校验值 */
.download-checksum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  min-width: 0;
  margin-top: 18px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(4, 8, 16, 0.45);
  font-size: 11px;
  color: var(--ink-faint);
}

.download-checksum > span {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.download-checksum code {
  min-width: 0;
  /* 校验值是下载信任链核心：任何宽度下都完整可读，宁可折行也不省略 */
  white-space: normal;
  overflow-wrap: anywhere;
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
}

/* 四项小字说明 */
.download-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  margin-top: clamp(20px, 2.6vw, 26px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  overflow-wrap: anywhere;
}

.download-facts li {
  min-width: 0;
}

.download-facts b {
  margin-right: 6px;
  font-weight: 600;
  color: var(--ink-dim);
}

/* 右侧步骤 / 免责声明 */
.download-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-left: clamp(24px, 3vw, 36px);
  border-left: 1px solid var(--line);
}

.download-side h3 {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.mini-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mini-steps li {
  position: relative;
  padding-left: 35px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-dim);
}

.mini-steps li > span {
  position: absolute;
  top: 1px;
  left: 0;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border: 1px solid rgba(99, 213, 255, 0.24);
  border-radius: 50%;
  background: rgba(99, 213, 255, 0.06);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--cyan);
}

.mini-steps code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(4, 8, 16, 0.5);
  color: #a8d9ff;
  font-size: 11.5px;
}

.mini-steps kbd {
  min-width: 0;
  padding: 1px 6px;
  font-size: 10.5px;
  border-radius: 6px;
}

.download-note {
  margin-top: 2px;
  padding: 10px 12px 10px 14px;
  border-left: 2px solid rgba(99, 213, 255, 0.5);
  border-radius: 0 8px 8px 0;
  background: linear-gradient(90deg, rgba(99, 213, 255, 0.05), transparent 72%);
  font-size: 12px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.download-note strong {
  color: var(--ink-dim);
  font-weight: 600;
}

/* ==========================================================================
   18. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.012), transparent 46%);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  padding-top: clamp(48px, 5vw, 64px);
  padding-bottom: 34px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  min-width: 0;
}

.footer-brand .brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.footer-nav a {
  padding: 6px 11px;
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--ink-dim);
  transition: color 0.28s ease, background-color 0.28s ease;
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.045);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 24px 30px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

.footer-legal {
  color: var(--ink-faint);
  text-align: right;
}

/* ==========================================================================
   19. 浮层：toast / 回到顶部
   ========================================================================== */
.toast {
  position: fixed;
  left: 50%;
  bottom: max(28px, calc(20px + var(--safe-bottom)));
  z-index: 90;
  max-width: min(92vw, 480px);
  padding: 12px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: rgba(12, 19, 33, 0.88);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.92);
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink);
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 20px);
  pointer-events: none;
  transition: opacity 0.35s var(--ease-out), transform 0.35s var(--ease-out),
    visibility 0.35s ease;
}

.toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.to-top {
  position: fixed;
  right: max(20px, calc(16px + var(--safe-right)));
  bottom: max(20px, calc(16px + var(--safe-bottom)));
  z-index: 70;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(12, 19, 33, 0.8);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  color: var(--ink-dim);
  box-shadow: 0 16px 36px -20px rgba(0, 0, 0, 0.9);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.32s var(--ease-out), transform 0.32s var(--ease-out),
    visibility 0.32s ease, border-color 0.3s ease, color 0.3s ease;
}

.to-top svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover {
  color: var(--ink);
  border-color: rgba(99, 213, 255, 0.32);
  transform: translateY(-2px);
}

/* ==========================================================================
   20. 滚动揭示动画（JS 只添加 .is-visible，错峰由下方选择器负责）
   ========================================================================== */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

html.js [data-reveal][data-reveal-delay="1"] {
  transition-delay: 0.08s;
}

html.js [data-reveal][data-reveal-delay="2"] {
  transition-delay: 0.16s;
}

html.js [data-reveal][data-reveal-delay="3"] {
  transition-delay: 0.24s;
}

html.js [data-reveal][data-reveal-delay="4"] {
  transition-delay: 0.32s;
}

/* ---------------------------------------------------------------------------
   首屏入场：不依赖 JS / IntersectionObserver，直接用 CSS 动画。
   目的：首帧就有可见文字（FCP 前移），并避免「JS 跑完 + 进入视口 + 0.7s 过渡」
   造成的 1s 以上空白期。下方规则让首屏元素保持可见，动画只负责入场位移。
   --------------------------------------------------------------------------- */
html.js .hero [data-reveal] {
  opacity: 1;
  transform: none;
}

.hero-copy > *,
.hero-visual {
  animation: hero-enter 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-copy > *:nth-child(1) {
  animation-delay: 0.03s;
}

.hero-copy > *:nth-child(2) {
  animation-delay: 0.08s;
}

.hero-copy > *:nth-child(3) {
  animation-delay: 0.14s;
}

.hero-copy > *:nth-child(4) {
  animation-delay: 0.2s;
}

.hero-copy > *:nth-child(5) {
  animation-delay: 0.26s;
}

.hero-visual {
  animation-duration: 0.78s;
  animation-delay: 0.1s;
}

@keyframes hero-enter {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   21. Keyframes
   ========================================================================== */
@keyframes aurora-one {
  0% {
    transform: translate3d(-3%, -2%, 0) scale(1);
  }
  50% {
    transform: translate3d(4%, 3%, 0) scale(1.07);
  }
  100% {
    transform: translate3d(-1%, 5%, 0) scale(1.03);
  }
}

@keyframes aurora-two {
  0% {
    transform: translate3d(2%, -3%, 0) scale(1.02);
  }
  50% {
    transform: translate3d(-5%, 4%, 0) scale(1);
  }
  100% {
    transform: translate3d(3%, 6%, 0) scale(1.06);
  }
}

@keyframes aurora-three {
  0% {
    transform: translate3d(-4%, 3%, 0) scale(1.04);
  }
  50% {
    transform: translate3d(5%, -2%, 0) scale(1);
  }
  100% {
    transform: translate3d(-2%, -5%, 0) scale(1.05);
  }
}

@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 rgba(99, 213, 255, 0.45);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(99, 213, 255, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(99, 213, 255, 0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes orb-float {
  0%,
  100% {
    transform: translateY(-6px);
  }
  50% {
    transform: translateY(9px);
  }
}

@keyframes card-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-9px);
  }
}

@keyframes beam-sweep {
  0% {
    transform: translateX(-26%) rotate(-24deg);
    opacity: 0;
  }
  18% {
    opacity: 0.55;
  }
  52% {
    opacity: 0.32;
  }
  100% {
    transform: translateX(26%) rotate(-24deg);
    opacity: 0;
  }
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* ==========================================================================
   22. 响应式
   ========================================================================== */

/* --- ≤1200px：整体微调 --- */
@media (max-width: 1200px) {
  .hero-inner {
    gap: clamp(40px, 5vw, 72px);
  }

  .float-card--hook {
    left: -4%;
  }

  .float-card--speed {
    right: -1%;
  }
}

/* --- ≤1080px：优势网格 3 → 2 列 --- */
@media (max-width: 1080px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-title {
    font-size: clamp(2.5rem, 5.2vw, 4.4rem);
  }

  .orb-stage {
    width: min(400px, 100%);
  }

  .float-card--speed {
    width: 160px;
  }

  .float-card--hook {
    width: 184px;
  }

  .hotkey-row {
    gap: 14px;
  }
}

/* --- ≤1000px：界面预览单列 --- */
@media (max-width: 1000px) {
  .ui-showcase {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(32px, 5vw, 44px);
  }

  .ui-frame {
    max-width: 780px;
    margin-inline: auto;
    width: 100%;
  }

  .ui-points {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(24px, 4vw, 40px);
  }

  .ui-point {
    padding: 18px 0;
  }

  .ui-point:first-child {
    padding-top: 18px;
  }

  .ui-point + .ui-point {
    border-top: 0;
  }

  .ui-point:nth-child(even) {
    border-left: 1px solid var(--line);
    padding-left: clamp(24px, 4vw, 40px);
  }

  .ui-point:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }
}

/* --- ≤980px：热键/下载两栏 → 单列 --- */
@media (max-width: 980px) {
  .split {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(32px, 5vw, 44px);
  }

  .spec-card {
    max-width: 640px;
  }

  .download-card {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(28px, 4vw, 36px);
  }

  .download-side {
    padding-left: 0;
    padding-top: clamp(24px, 4vw, 30px);
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .download-glow {
    top: -30%;
    right: -20%;
    width: 82%;
  }
}

/* --- ≤900px：移动端导航 + Hero 单列 + 标题分栏单列 --- */
@media (max-width: 900px) {
  :root {
    --header-h: 66px;
  }

  .header-inner {
    display: flex;
    justify-content: space-between;
    gap: 14px;
  }

  .brand {
    position: relative;
    z-index: 3;
  }

  .header-actions {
    position: relative;
    z-index: 3;
    margin-left: auto;
  }

  .nav-toggle {
    display: inline-flex;
  }

  /* 抽屉：从顶部滑出 */
  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-self: auto;
    gap: 0;
    padding: calc(var(--header-h) + var(--safe-top) + 18px) clamp(20px, 6vw, 34px)
      calc(24px + var(--safe-bottom));
    border-bottom: 1px solid var(--line);
    border-radius: 0 0 24px 24px;
    background: linear-gradient(180deg, rgba(9, 15, 27, 0.97), rgba(6, 10, 19, 0.95));
    backdrop-filter: blur(24px) saturate(150%);
    -webkit-backdrop-filter: blur(24px) saturate(150%);
    box-shadow: 0 44px 90px -36px rgba(0, 0, 0, 0.95);
    transform: translateY(-110%);
    visibility: hidden;
    transition: transform 0.46s var(--ease-out), visibility 0.46s ease;
  }

  .site-nav.is-open,
  .site-header.nav-open .site-nav {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav a {
    padding: 14px 4px;
    border-radius: 0;
    border-bottom: 1px solid var(--line);
    font-size: 16.5px;
    color: var(--ink-dim);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .site-nav a:hover,
  .site-nav a:focus-visible {
    color: var(--ink);
  }

  /* 抽屉打开时给 header 补一层底色 */
  .site-header.nav-open::before {
    background: rgba(4, 7, 13, 0.72);
    border-bottom-color: var(--line);
  }

  .hero {
    min-height: 0;
    padding-top: calc(var(--header-h) + var(--safe-top) + clamp(36px, 7vw, 60px));
    padding-bottom: clamp(44px, 7vw, 72px);
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(40px, 7vw, 64px);
  }

  .hero-copy {
    max-width: 680px;
  }

  .hero-visual {
    order: 0;
  }

  .orb-stage {
    width: min(420px, 88vw);
    margin-inline: auto;
  }

  .hero-halo {
    height: min(680px, 100vw);
    opacity: 0.8;
  }

  .section-head--split {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
    gap: 18px;
  }

  .section-lead--tight {
    padding-bottom: 0;
  }

  .steps {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(24px, 4vw, 32px);
  }

  .step {
    padding-top: 24px;
  }

  .step p {
    max-width: 66ch;
  }
}

/* --- ≤860px：数据条 2 列 --- */
@media (max-width: 860px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat {
    padding: 22px clamp(18px, 4vw, 30px);
  }

  .stat:first-child {
    padding-left: clamp(18px, 4vw, 30px);
  }

  .stat:nth-child(odd) {
    border-left: 0;
    padding-left: 0;
  }

  .stat:nth-child(n + 3) {
    border-top: 1px solid var(--line);
  }

  .mech {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(26px, 4vw, 34px);
  }
}

/* --- ≤720px：优势单列、隐藏悬浮卡、收紧节奏 --- */
@media (max-width: 720px) {
  .section {
    padding-block: clamp(66px, 13vw, 88px);
  }

  .section + .section::before {
    width: var(--container);
  }

  .feature-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .card--wide {
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: flex-start;
  }

  .card--wide .card-ico {
    margin-bottom: clamp(18px, 2vw, 24px);
  }

  .float-card {
    display: none;
  }

  .orb-stage {
    width: min(360px, 86vw);
  }

  .hero-strip {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-top: clamp(36px, 8vw, 48px);
  }

  .marquee {
    width: 100%;
    flex: none;
  }

  .section-head {
    gap: 14px;
    margin-bottom: clamp(36px, 7vw, 48px);
  }

  .section-title {
    font-size: clamp(1.7rem, 6.4vw, 2.2rem);
  }

  .ui-points {
    grid-template-columns: minmax(0, 1fr);
  }

  .ui-point:nth-child(even) {
    border-left: 0;
    padding-left: 0;
  }

  .ui-point:nth-child(n + 2) {
    border-top: 1px solid var(--line);
  }

  .footer-inner {
    flex-direction: column;
    gap: 24px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .footer-legal {
    text-align: left;
  }
}

/* --- ≤560px：手机紧凑版 --- */
@media (max-width: 560px) {
  .brand-text {
    gap: 7px;
  }

  .brand-text strong {
    font-size: 15px;
  }

  .brand-sub {
    font-size: 10px;
    letter-spacing: 0.12em;
    padding-left: 7px;
  }

  .header-actions .btn-sm {
    min-height: 36px;
    padding: 7px 12px;
    font-size: 12.5px;
  }

  .header-actions .btn-sm .ico {
    width: 15px;
    height: 15px;
  }

  .hero-title {
    font-size: clamp(2.35rem, 10.4vw, 3rem);
    letter-spacing: -0.025em;
  }

  .eyebrow {
    padding: 6px 12px 6px 10px;
    font-size: 11.5px;
    letter-spacing: 0.035em;
    white-space: normal;
  }

  .hero-lead {
    font-size: 15.5px;
    line-height: 1.85;
  }

  .hero-lead strong {
    white-space: normal;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .hero-cta .btn {
    width: 100%;
  }

  .hero-cta .btn-lg {
    min-height: 54px;
    font-size: 15.5px;
  }

  .hero-facts {
    display: flex;
    flex-direction: column;
    border-top: 0;
    padding-top: 0;
  }

  .hero-facts li {
    padding: 12px 0;
  }

  .hero-facts li:first-child {
    padding-top: 0;
  }

  .hero-facts li + li {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .hero-facts li:first-child {
    border-top: 1px solid var(--line);
  }

  .orb-stage {
    width: min(320px, 84vw);
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .stat {
    padding: 18px clamp(12px, 3vw, 18px);
  }

  .stat-num {
    font-size: clamp(2.35rem, 10vw, 2.9rem);
  }

  .stat-label {
    margin-top: 9px;
    font-size: 12.5px;
  }

  .section-kicker {
    font-size: 11.5px;
    letter-spacing: 0.14em;
  }

  .card--feature {
    padding: 22px;
    border-radius: 18px;
  }

  .card--feature h3 {
    font-size: 18px;
  }

  .card--feature p {
    font-size: 14.2px;
  }

  .mech {
    padding: 22px;
    border-radius: 20px;
  }

  .mech-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    align-items: start;
    padding: 12px 0;
  }

  .mech-list code {
    font-size: 11.5px;
  }

  .mech-list span {
    font-size: 12.5px;
  }

  .ui-frame {
    border-radius: 14px;
  }

  .ui-frame-bar {
    height: 32px;
  }

  .ui-frame-title {
    font-size: 10px;
    padding-inline: 52px;
  }

  .hotkey-row {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 10px;
    padding: 14px 0;
  }

  .hotkey-row [role="cell"]:last-child {
    font-size: 13px;
  }

  .hotkey-row [role="cell"]:first-child {
    gap: 4px;
  }

  kbd {
    min-width: 24px;
    padding: 2px 7px;
    font-size: 10.5px;
  }

  .plus {
    font-size: 10px;
  }

  .spec-card {
    padding: 20px;
    border-radius: 18px;
  }

  .spec-list > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 10px 0;
  }

  .faq-item summary {
    padding: 16px 18px;
    font-size: 15px;
    gap: 14px;
  }

  .faq-a {
    padding: 0 18px 18px;
    font-size: 14.2px;
  }

  .tick-list li {
    font-size: 14px;
  }

  .download-card {
    padding: 22px;
    border-radius: 20px;
  }

  .download-head {
    gap: 14px;
  }

  .download-icon {
    width: 58px;
    height: 58px;
    border-radius: 15px;
  }

  .download-title {
    font-size: 1.35rem;
  }

  .download-sub {
    font-size: 12px;
  }

  .download-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .download-actions .btn {
    width: 100%;
  }

  .download-actions .btn-xl {
    min-height: 58px;
    padding-inline: 20px;
    font-size: 16px;
  }

  .download-actions .btn-ghost {
    min-height: 50px;
  }

  .download-checksum {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }

  .download-checksum code {
    white-space: normal;
    overflow-wrap: anywhere;
    text-overflow: clip;
  }

  .download-facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .download-side {
    padding-top: 20px;
  }

  .to-top {
    width: 40px;
    height: 40px;
    right: max(14px, calc(10px + var(--safe-right)));
    bottom: max(14px, calc(10px + var(--safe-bottom)));
  }

  .toast {
    width: calc(100vw - 32px);
    max-width: none;
    padding: 11px 14px;
  }
}

/* ==========================================================================
   23. 无障碍 / 降级
   ========================================================================== */

/* 减少动态效果：关掉所有动画与位移动画，但保留可见性 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }

  .aurora,
  .orb,
  .orb-ring,
  .orb-beam,
  .float-card,
  .marquee-track,
  .pulse-dot,
  .dot--live {
    animation: none !important;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .orb-beam {
    display: none;
  }
}

/* 触屏设备不显示光标光晕 */
@media (hover: none), (pointer: coarse) {
  .cursor-glow {
    display: none;
  }
}

/* 无 JS 时内容始终可读（渐进增强） */
html:not(.js) [data-reveal] {
  opacity: 1;
  transform: none;
}

/* 无 JS 时汉堡按钮没有行为，隐藏它并把导航直接铺开，避免「死按钮」 */
html:not(.js) .nav-toggle {
  display: none;
}

@media (max-width: 900px) {
  html:not(.js) .header-inner {
    flex-wrap: wrap;
  }

  html:not(.js) .site-nav {
    order: 3;
    width: 100%;
    position: static;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 2px 18px;
    margin: 0;
    padding: 8px 0;
    border-bottom: 0;
    border-radius: 0;
    background: none;
    box-shadow: none;
    transform: none;
    visibility: visible;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  html:not(.js) .site-nav a {
    padding: 6px 0;
    border-bottom: 0;
    font-size: 14px;
  }
}

/* ==========================================================================
   24. 运行时性能（放在最后：覆盖优先级最高）：移动端/触屏降负 + 滚出首屏后暂停氛围动画
   ========================================================================== */

/* 触屏 / 窄屏：拿掉最贵的合成开销，保观感不保「逐帧炫技」 */
@media (max-width: 900px), (hover: none) and (pointer: coarse) {
  /* 1) 全屏叠加的颗粒层：feTurbulence + overlay 混合，移动端每帧都要重新混合 */
  .grain {
    display: none;
  }

  /* 2) 大光晕停掉逐帧动画，只留静态光（视觉几乎无差，功耗/帧率差别很大） */
  .aurora {
    animation: none;
    filter: blur(46px);
  }

  /* 3) backdrop-filter 在滚动时每帧重新模糊背景，是移动端最大开销来源，成片关掉 */
  .site-header.is-scrolled::before,
  .nav-toggle,
  .btn-ghost,
  .eyebrow,
  .orb,
  .float-card,
  .mech,
  .spec-card,
  .toast,
  .to-top {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  /* 去掉模糊后补足底色（0.985）：模糊能吃掉背后文字，不透明底色同样能 */
  .site-header.is-scrolled::before,
  .site-header.nav-open::before {
    background: rgba(4, 7, 13, 0.985);
  }

  .float-card {
    background: linear-gradient(160deg, rgba(13, 20, 34, 0.95), rgba(8, 13, 24, 0.92));
  }

  .toast {
    background: rgba(9, 14, 25, 0.96);
  }

  /* 4) 扫光条：blur + screen 混合 + 无限动画，窄屏收益极低 */
  .orb-beam {
    display: none;
  }

  /* 5) 首屏浮动卡片在窄屏已隐藏，这里再兜一层 */
  .float-card {
    will-change: auto;
  }
}

/* 滚出首屏后暂停所有氛围类动画：把 GPU 让给正文滚动 */
body.is-past-hero .aurora,
body.is-past-hero .orb,
body.is-past-hero .orb-ring,
body.is-past-hero .orb-beam,
body.is-past-hero .float-card,
body.is-past-hero .marquee-track,
body.is-past-hero .dot--live,
body.is-past-hero .pulse-dot {
  animation-play-state: paused;
}