:root {
  --c-bg: #FFFFFF;
  --c-panel: #F4F4F3;
  --c-ink-900: #0C0D0C;
  --c-border: #E2E2DF;
  --c-accent: #84F05E;
  --c-accent-dark: #2C7A14;
  --c-text: #121312;
  --c-text-muted: #5E615E;
  --c-success: #2E9E4A;
  --c-warn: #C98208;
  --c-error: #D2362B;
  --c-black: #000000;
  --c-transparent: transparent;

  --c-on-dark: #F4F4F3;
  --c-on-dark-soft: #C9CBC8;
  --c-on-dark-muted: #9A9E9A;
  --c-on-dark-dim: #5F635F;
  --c-line-dark-soft: rgba(244, 244, 243, 0.10);
  --c-line-dark-mid: rgba(244, 244, 243, 0.16);
  --c-line-dark-strong: rgba(244, 244, 243, 0.30);
  --c-fill-dark-soft: rgba(244, 244, 243, 0.05);
  --c-fill-dark-mid: rgba(244, 244, 243, 0.08);
  --c-ring: rgba(244, 244, 243, 0.085);
  --c-ring-dash: rgba(244, 244, 243, 0.12);

  --c-win-face: #161816;
  --c-win-plate-near: #242624;
  --c-win-plate-far: #1A1C1A;
  --c-win-line: #2E312E;
  --c-win-raise: #1D201D;
  --c-win-knob: #6E726E;
  --c-win-dot: #3A3D3A;

  --c-accent-glow-strong: rgba(132, 240, 94, 0.26);
  --c-accent-glow-mid: rgba(132, 240, 94, 0.09);
  --c-accent-glow-faint: rgba(132, 240, 94, 0.00);
  --c-accent-edge: rgba(132, 240, 94, 0.75);
  --c-accent-sheen: rgba(132, 240, 94, 0.14);
  --c-accent-veil: rgba(132, 240, 94, 0.00);

  --f-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-body: 16px;
  --fs-lead: 20px;
  --fs-h1: clamp(34px, 3.4vw, 48px);
  --fs-h2: clamp(24px, 2.5vw, 32px);
  --fs-h3: 22px;
  --fs-hero-note: 17px;
  --fs-brand: 17px;
  --fs-nav: 14.5px;
  --fs-small-ui: 12.5px;
  --fs-lang: 13.5px;
  --fs-window: 13px;
  --fs-micro: 11.5px;
  --fs-caret: 10px;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-bold: 700;
  --fw-heavy: 800;
  --fw-black: 900;
  --lh-body: 1.6;
  --lh-heading: 1.18;
  --tracking-heading: -0.02em;

  --r-pill: 999px;
  --r-btn: 14px;
  --r-win: 20px;
  --r-field: 8px;
  --r-focus: 6px;
  --r-card: 24px;
  --r-tray: 32px;
  --r-section: 40px;
  --r-circle: 50%;
  --r-square: 0;

  --gutter: 80px;
  --header-h: 84px;
  --content-w: 1200px;
  --reading-w: 800px;
  --header-w: 1280px;
  --space-section: 88px;
  --motion-short: 180ms;
  --motion-reveal: 500ms;
  --ease-out: cubic-bezier(0.2, 0.65, 0.3, 1);
  --focus-ring: 2px solid var(--c-accent-dark);
  --z-header: 30;
  --z-fab: 20;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a { -webkit-tap-highlight-color: var(--c-transparent); }
button { color: inherit; }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
svg, .icon, .status-dot { flex-shrink: 0; }
p, h1, h2, h3, h4, figure { margin: 0; }
h1, h2, h3 {
  font-family: var(--f-display);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--fs-h1); font-weight: var(--fw-black); }
h2 { font-size: var(--fs-h2); font-weight: var(--fw-heavy); }
h3 { font-size: var(--fs-h3); font-weight: var(--fw-bold); }
ul, ol { margin: 0; padding-left: 1.5em; }
pre, code, kbd, samp { font-family: var(--f-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 20px;
  margin: 20px 0 0;
  border: 1px solid var(--c-win-line);
  border-radius: var(--r-field);
  background: var(--c-ink-900);
  color: var(--c-on-dark);
  font-size: var(--fs-sm);
  line-height: 1.75;
  tab-size: 2;
}
pre code { overflow-wrap: normal; word-break: normal; white-space: pre; }
:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
  border-radius: var(--r-focus);
}
.stage :focus-visible,
.site-footer :focus-visible,
.masthead :focus-visible { outline-color: var(--c-accent); }
::selection { background: var(--c-accent); color: var(--c-ink-900); }

.wrap {
  width: 100%;
  max-width: calc(var(--content-w) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--reading { max-width: calc(var(--reading-w) + var(--gutter) * 2); }
.section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.section-heading { max-width: 44em; margin-bottom: 36px; }
.section-heading p { margin-top: 14px; color: var(--c-text-muted); }
.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid > *, .header-frame > *, .footer-grid > *, .prose > * { min-width: 0; }
.stack > * + * { margin-top: 20px; }
.mono { font-family: var(--f-mono); }
.muted { color: var(--c-text-muted); }
.keep-word { white-space: nowrap; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 8px;
  left: var(--gutter);
  z-index: 100;
  padding: 12px 18px;
  border-radius: var(--r-field);
  background: var(--c-accent);
  color: var(--c-ink-900);
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }
.prose { min-width: 0; }
.prose :where(p, ul, ol, blockquote, pre, figure, details) { margin-top: 20px; }
.prose h2 { margin-top: 56px; }
.prose h3 { margin-top: 32px; }
.prose a:not(.btn) { text-decoration: underline; text-underline-offset: 4px; }
.prose li + li { margin-top: 8px; }
.prose :not(pre) > code {
  padding: 2px 5px;
  border-radius: var(--r-focus);
  background: var(--c-panel);
  color: var(--c-text);
  font-size: 0.9em;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  min-height: 56px;
  padding: 12px 28px;
  border: 1px solid var(--c-transparent);
  border-radius: var(--r-btn);
  background: var(--c-transparent);
  color: var(--c-text);
  font-family: var(--f-body);
  font-size: var(--fs-body);
  font-weight: var(--fw-bold);
  letter-spacing: -0.005em;
  line-height: 1.4;
  text-align: center;
  transition: transform var(--motion-short) var(--ease-out), border-color var(--motion-short) var(--ease-out);
}
.btn:hover { transform: translateY(-1px); }
.btn:active, .btn.is-active { transform: translateY(1px); }
.btn svg { width: 18px; height: 18px; }
.btn--solid { background: var(--c-accent); color: var(--c-ink-900); }
.btn--outline { border-color: var(--c-border); background: var(--c-bg); color: var(--c-text); }
.btn--outline:hover { border-color: var(--c-text-muted); }
.btn--line {
  border-color: var(--c-line-dark-strong);
  background: var(--c-transparent);
  color: var(--c-on-dark);
}
.btn--line:hover { border-color: var(--c-on-dark-soft); }
.btn--dark { background: var(--c-ink-900); color: var(--c-on-dark); border-radius: var(--r-pill); }
.btn--small { min-height: 44px; padding: 10px 18px; font-size: var(--fs-sm); }
.btn:disabled, .btn[aria-disabled="true"] {
  border-color: var(--c-border);
  background: var(--c-panel);
  color: var(--c-text-muted);
  cursor: not-allowed;
  transform: none;
}
.btn.is-focus { outline: var(--focus-ring); outline-offset: 3px; }

.panel {
  padding: 36px;
  border-radius: var(--r-tray);
  background: var(--c-panel);
  color: var(--c-text);
}
.card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-bg);
  color: var(--c-text);
}
.card p { margin-top: 12px; color: var(--c-text-muted); }
.card__link { display: inline-block; margin-top: 20px; font-weight: var(--fw-bold); }
.card__link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* 页头使用独立宽版心，不复用阅读版心。 */
#site-header { position: relative; z-index: var(--z-header); }
.masthead {
  position: relative;
  z-index: var(--z-header);
  height: var(--header-h);
  background: var(--c-ink-900);
  color: var(--c-on-dark);
}
.stage > #site-header,
.stage > .masthead { position: absolute; inset: 0 0 auto; }
.header-frame {
  position: relative;
  display: flex;
  align-items: center;
  gap: 40px;
  width: 100%;
  height: var(--header-h);
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__mark { width: 30px; height: 30px; flex-shrink: 0; }
.brand__name {
  color: var(--c-on-dark);
  font-family: var(--f-display);
  font-weight: var(--fw-heavy);
  font-size: var(--fs-brand);
  letter-spacing: -0.01em;
}
.primary-nav { margin-left: auto; min-width: 0; }
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
}
.primary-nav__item { display: flex; align-items: center; }
.primary-nav__item + .primary-nav__item::before {
  content: "/";
  margin: 0 13px;
  color: var(--c-on-dark-dim);
  font-size: var(--fs-sm);
}
.primary-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 0;
  color: var(--c-on-dark-muted);
  font-size: var(--fs-nav);
  font-weight: var(--fw-medium);
  white-space: nowrap;
}
.primary-nav__link:hover,
.primary-nav__link[aria-current="page"] { color: var(--c-on-dark); }
.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 18px;
  height: 2px;
  margin-left: -9px;
  border-radius: var(--r-pill);
  background: var(--c-accent);
}
.header-tools { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.language-picker { position: relative; }
.lang-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 8px 15px 8px 13px;
  border: 1px solid var(--c-line-dark-mid);
  border-radius: var(--r-pill);
  background: var(--c-transparent);
  color: var(--c-on-dark-soft);
  font-family: var(--f-body);
  font-size: var(--fs-lang);
  font-weight: var(--fw-medium);
  white-space: nowrap;
}
.lang-switch:hover { border-color: var(--c-line-dark-strong); color: var(--c-on-dark); }
.lang-switch svg { width: 15px; height: 15px; }
.lang-switch__caret { font-size: var(--fs-caret); color: var(--c-on-dark-muted); }
.lang-switch__short { display: none; }
.language-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  z-index: 4;
  width: 190px;
  padding: 8px;
  border: 1px solid var(--c-win-line);
  border-radius: var(--r-btn);
  background: var(--c-win-face);
  color: var(--c-on-dark);
  list-style: none;
  margin: 0;
}
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: var(--r-field); }
.language-menu a:hover,
.language-menu a[aria-current="true"] { background: var(--c-fill-dark-mid); color: var(--c-on-dark); }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--c-line-dark-mid);
  border-radius: var(--r-field);
  background: var(--c-transparent);
  color: var(--c-on-dark);
}
.menu-toggle svg { width: 22px; height: 22px; }
.menu-drawer {
  position: absolute;
  inset: var(--header-h) 0 auto;
  z-index: 3;
  max-height: calc(100dvh - var(--header-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid var(--c-win-line);
  background: var(--c-ink-900);
  color: var(--c-on-dark);
}
.menu-drawer ul { margin: 0; padding: 0; list-style: none; }
.menu-drawer a {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 48px;
  padding: 12px 8px;
  border-bottom: 1px solid var(--c-line-dark-soft);
  color: var(--c-on-dark-soft);
}
.menu-drawer a[aria-current] { color: var(--c-accent); }
.menu-drawer__languages { margin-top: 20px !important; }
.menu-drawer__label { padding: 14px 8px 4px; font-size: var(--fs-xs); color: var(--c-on-dark-muted); }
.menu-veil {
  position: fixed;
  inset: var(--header-h) 0 0;
  z-index: 1;
  border: 0;
  background: var(--c-line-dark-strong);
  color: var(--c-on-dark);
}

/* 已确认首屏：轨道作为远景，设置窗作为唯一实体道具。 */
.stage {
  position: relative;
  height: clamp(780px, 100vh, 960px);
  background: var(--c-ink-900);
  color: var(--c-on-dark);
  overflow: hidden;
  overflow-x: clip;
  isolation: isolate;
}
.hero-visual { position: absolute; inset: 0; pointer-events: none; }
.orbit {
  position: absolute;
  top: 0;
  right: -190px;
  z-index: 0;
  width: 900px;
  height: 900px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, var(--c-transparent) 0, var(--c-black) 15%, var(--c-black) 84%, var(--c-transparent) 100%);
  mask-image: linear-gradient(to bottom, var(--c-transparent) 0, var(--c-black) 15%, var(--c-black) 84%, var(--c-transparent) 100%);
}
.orbit__ring { position: absolute; border-radius: var(--r-circle); }
.orbit__ring--outer { inset: 0; border: 1px solid var(--c-ring); }
.orbit__ring--inner { inset: 130px; border: 1px dashed var(--c-ring-dash); }
.orbit__tag {
  position: absolute;
  left: 50%;
  top: 50%;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 11px 4px 9px;
  border: 1px solid var(--c-line-dark-soft);
  border-radius: var(--r-pill);
  background: var(--c-ink-900);
  color: var(--c-on-dark-muted);
  font-family: var(--f-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.02em;
  white-space: nowrap;
  transform: rotate(var(--a)) translateX(var(--r)) rotate(calc(-1 * var(--a))) translate(-50%, -50%);
}
.orbit__tag::before {
  content: "";
  width: 5px;
  height: 5px;
  flex-shrink: 0;
  border-radius: var(--r-circle);
  background: var(--c-on-dark-dim);
}
.orbit__tag--vmess { --a: -158deg; --r: 450px; }
.orbit__tag--vless { --a: -136deg; --r: 450px; }
.orbit__tag--reality { --a: -90deg; --r: 320px; }
.orbit__tag--trojan { --a: 90deg; --r: 320px; }
.orbit__tag--ss { --a: 140deg; --r: 450px; }
.side-light {
  position: absolute;
  top: -330px;
  right: -390px;
  z-index: 1;
  width: 900px;
  height: 900px;
  border-radius: var(--r-circle);
  background: radial-gradient(circle at 50% 50%, var(--c-accent-glow-strong) 0%, var(--c-accent-glow-mid) 30%, var(--c-accent-glow-faint) 62%);
}
.rig {
  position: absolute;
  top: 212px;
  right: -56px;
  z-index: 2;
  width: 620px;
  height: 440px;
  perspective: 1800px;
}
.rig__body {
  position: relative;
  width: 100%;
  height: 100%;
  transform: rotateY(-12deg) rotateZ(-3deg);
  transform-origin: 40% 50%;
}
.rig__plate { position: absolute; inset: 0; border-radius: var(--r-win); }
.rig__plate--far { background: var(--c-win-plate-far); color: var(--c-on-dark); transform: translate(-22px, 26px); }
.rig__plate--near { background: var(--c-win-plate-near); color: var(--c-on-dark); transform: translate(-11px, 13px); }
.win {
  position: relative;
  display: grid;
  grid-template-rows: 42px 1fr;
  width: 100%;
  height: 100%;
  border: 1px solid var(--c-win-line);
  border-radius: var(--r-win);
  background: var(--c-win-face);
  color: var(--c-on-dark-soft);
  overflow: hidden;
  font-size: var(--fs-window);
}
.win::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  border-radius: inherit;
  background: linear-gradient(208deg, var(--c-accent-sheen) 0%, var(--c-accent-veil) 30%);
}
.win::after {
  content: "";
  position: absolute;
  top: 0;
  left: 34%;
  right: 6%;
  z-index: 4;
  height: 1px;
  background: linear-gradient(90deg, var(--c-accent-veil), var(--c-accent-edge));
}
.win__chrome { display: flex; align-items: center; gap: 8px; padding: 0 18px; border-bottom: 1px solid var(--c-win-line); }
.win__dot { width: 11px; height: 11px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--c-win-dot); }
.win__title { margin-left: 12px; font-size: var(--fs-small-ui); font-weight: var(--fw-medium); color: var(--c-on-dark-muted); letter-spacing: 0.01em; }
.win__frame { display: grid; grid-template-columns: 146px minmax(0, 1fr); min-height: 0; }
.win__side { padding: 16px 0; border-right: 1px solid var(--c-win-line); }
.win__side-item { position: relative; padding: 9px 18px 9px 20px; color: var(--c-on-dark-muted); font-weight: var(--fw-medium); }
.win__side-item.is-current { color: var(--c-on-dark); background: var(--c-fill-dark-soft); }
.win__side-item.is-current::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: var(--r-square) var(--r-pill) var(--r-pill) var(--r-square);
  background: var(--c-accent);
}
.win__main { display: flex; flex-direction: column; padding: 16px 22px; min-width: 0; }
.win__head { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 10px; }
.win__head-title { font-size: var(--fs-sm); font-weight: var(--fw-bold); color: var(--c-on-dark); }
.win__head-note { font-size: var(--fs-micro); color: var(--c-on-dark-muted); }
.win__row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 43px; border-top: 1px solid var(--c-win-line); }
.win__label { white-space: nowrap; }
.win__field,
.win__select {
  min-width: 82px;
  padding: 5px 10px;
  border: 1px solid var(--c-win-line);
  border-radius: var(--r-field);
  background: var(--c-win-raise);
  color: var(--c-on-dark);
  font-size: var(--fs-small-ui);
}
.win__field { text-align: right; }
.win__select { display: inline-flex; align-items: center; justify-content: space-between; gap: 18px; min-width: 108px; }
.win__select-caret { color: var(--c-on-dark-muted); font-size: var(--fs-caret); }
.switch { position: relative; width: 34px; height: 20px; flex-shrink: 0; border-radius: var(--r-pill); background: var(--c-win-line); }
.switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: var(--r-circle); background: var(--c-win-knob); }
.switch.is-on { background: var(--c-accent); }
.switch.is-on::after { left: 17px; background: var(--c-ink-900); }
.radios { display: flex; gap: 14px; font-size: var(--fs-xs); }
.radio { display: inline-flex; align-items: center; gap: 6px; color: var(--c-on-dark-muted); white-space: nowrap; }
.radio::before { content: ""; width: 13px; height: 13px; flex-shrink: 0; border: 1px solid var(--c-win-knob); border-radius: var(--r-circle); }
.radio.is-on { color: var(--c-on-dark); }
.radio.is-on::before { border: 4px solid var(--c-accent); background: var(--c-ink-900); }
.win__foot { display: flex; justify-content: flex-end; gap: 8px; margin-top: auto; padding-top: 12px; border-top: 1px solid var(--c-win-line); }
.win__btn { padding: 5px 16px; border: 1px solid var(--c-win-line); border-radius: var(--r-field); color: var(--c-on-dark-muted); font-size: var(--fs-xs); }
.win__btn--confirm { color: var(--c-on-dark); background: var(--c-win-raise); }
.lede { position: relative; z-index: 3; max-width: calc(620px + var(--gutter)); padding: 204px 0 0 var(--gutter); }
.badge {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  min-height: 30px;
  max-width: 100%;
  padding: 4px 14px 4px 12px;
  border: 1px solid var(--c-line-dark-soft);
  border-radius: var(--r-pill);
  background: var(--c-fill-dark-soft);
  color: var(--c-on-dark-soft);
  font-size: var(--fs-small-ui);
  font-weight: var(--fw-medium);
}
.badge__dot { width: 7px; height: 7px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--c-accent); }
.badge__sep { color: var(--c-on-dark-dim); }
.headline {
  margin-top: 26px;
  font-family: var(--f-display);
  font-size: var(--fs-h1);
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--c-on-dark);
}
.headline__strong { display: block; font-weight: var(--fw-black); }
.headline__soft { display: block; font-weight: var(--fw-regular); color: var(--c-on-dark-soft); }
.lede__text { max-width: 31em; margin-top: 22px; font-size: var(--fs-hero-note); line-height: 1.72; color: var(--c-on-dark-muted); }
.lede__text strong { font-weight: var(--fw-bold); color: var(--c-on-dark); }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.chip { max-width: 100%; padding: 5px 12px; border: 1px solid var(--c-line-dark-soft); border-radius: var(--r-pill); color: var(--c-on-dark-muted); font-size: var(--fs-small-ui); line-height: 1.5; overflow-wrap: anywhere; }
.platforms { display: flex; align-items: center; gap: 26px; margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--c-line-dark-soft); max-width: 560px; }
.platforms__cap { font-size: var(--fs-xs); font-weight: var(--fw-medium); letter-spacing: 0.06em; color: var(--c-on-dark-muted); white-space: nowrap; }
.platforms__list { display: flex; flex-wrap: wrap; align-items: center; gap: 24px; }
.platform { display: inline-flex; align-items: center; gap: 8px; color: var(--c-on-dark-soft); font-size: var(--fs-sm); font-weight: var(--fw-medium); }
.platform:hover { color: var(--c-on-dark); }
.platform svg { width: 17px; height: 17px; }
.next { position: relative; z-index: 6; margin-top: calc(-1 * var(--r-section)); padding: 88px var(--gutter) 96px; border-radius: var(--r-section) var(--r-section) var(--r-square) var(--r-square); background: var(--c-bg); color: var(--c-text); text-align: center; }
.next__title { font-size: 30px; font-weight: var(--fw-heavy); letter-spacing: -0.025em; }
.next__text { max-width: 34em; margin: 14px auto 0; color: var(--c-text-muted); }

.site-footer { padding-top: 64px; padding-bottom: 30px; background: var(--c-ink-900); color: var(--c-on-dark); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 0.8fr 1.4fr; gap: 48px; }
.footer-brand p { max-width: 26em; margin-top: 18px; color: var(--c-on-dark-muted); font-size: var(--fs-sm); }
.footer-heading { margin-bottom: 16px; font-size: var(--fs-sm); font-weight: var(--fw-bold); letter-spacing: 0; }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 20px; list-style: none; margin: 0; padding: 0; }
.footer-links a { display: inline-block; padding-block: 4px; color: var(--c-on-dark-muted); font-size: var(--fs-sm); overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--c-on-dark); text-decoration: underline; text-underline-offset: 4px; }
.footer-languages { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--c-line-dark-soft); }
.footer-languages a { padding-block: 8px; color: var(--c-on-dark-muted); font-size: var(--fs-sm); }
.footer-languages a[aria-current="true"] { color: var(--c-on-dark); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-top: 24px; color: var(--c-on-dark-muted); font-size: var(--fs-xs); }
.footer-bottom a { text-decoration: underline; text-underline-offset: 3px; }

/* 默认可见，只有观察器成功启用后才进入淡入初态。 */
.reveal { opacity: 1; }
.reveal-ready .reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--motion-reveal) var(--ease-out), transform var(--motion-reveal) var(--ease-out); }
.reveal-ready .reveal.shown { opacity: 1; transform: none; }

@media (max-width: 1360px) {
  .header-frame { gap: 24px; }
  .primary-nav__item + .primary-nav__item::before { margin: 0 9px; }
  .primary-nav__link { font-size: var(--fs-lang); }
}
@media (max-width: 1279px) {
  .primary-nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
}
@media (min-width: 1280px) {
  .menu-drawer, .menu-veil { display: none !important; }
}
@media (max-width: 1100px) {
  :root { --gutter: 32px; }
  .stage { height: auto; padding-bottom: 120px; }
  .lede { padding-top: 132px; max-width: none; padding-right: var(--gutter); }
  .hero-visual { position: relative; height: 504px; }
  .orbit { display: none; }
  .side-light { top: auto; bottom: -420px; right: -460px; }
  .rig { top: 64px; right: auto; left: var(--gutter); width: min(620px, calc(100% - 2 * var(--gutter))); height: 440px; }
  .rig__body { transform: rotateY(-6deg) rotateZ(-2deg); }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  :root { --fs-h1: clamp(24px, 5vw, 30px); }
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; --space-section: 56px; --fs-brand: 15px; --fs-hero-note: 15.5px; }
  .header-frame { gap: 12px; }
  .header-frame > .brand { flex-shrink: 1; }
  .header-frame .brand__name { min-width: 0; overflow-wrap: anywhere; }
  .header-tools { margin-left: auto; gap: 8px; }
  .lang-switch__full { display: none; }
  .lang-switch__short { display: inline; }
  .lang-switch { min-height: 44px; padding-inline: 12px; }
  .lang-switch svg { display: none; }
  .headline { font-size: clamp(24px, 7vw, 30px); }
  .headline__soft { white-space: normal; }
  .btn { min-height: 52px; padding: 12px 22px; font-size: 15px; }
  .platforms { flex-wrap: wrap; gap: 14px; }
  .platforms__list { flex-wrap: wrap; gap: 16px; }
  .rig { height: 400px; }
  .hero-visual { height: 464px; }
  .rig__body, .tilt, [data-tilt] { transform: none !important; }
  .win__frame { grid-template-columns: minmax(0, 1fr); }
  .win__side { display: none; }
  .win__main { padding-inline: 14px; }
  .win__row { gap: 10px; }
  .win__label { white-space: normal; }
  .radios { flex-direction: column; gap: 4px; }
  .next__title { font-size: 24px; }
  .grid--2, .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { grid-column: auto; }
  .footer-grid { gap: 32px; }
  .card, .panel { padding: 24px; }
  .chips { flex-direction: row; flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal-ready .reveal { opacity: 1; transform: none; }
}