/* ============================================================
   新普京游戏 · 共享外壳样式 / assets/site.css
   深海军蓝底 · 电光紫主调 · 霓虹青筛选 · 暖金代码
   ============================================================ */

/* 1. Reset ------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}
body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background: #070C1E;
  color: #EAF0FF;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* 2. 变量 -------------------------------------------------- */
:root {
  --bg: #070C1E;
  --panel: #101A38;
  --panel-2: #0C1430;
  --purple: #7C4DFF;
  --violet: #B79BFF;
  --cyan: #22D3EE;
  --gold: #F7C14B;
  --ink: #EAF0FF;
  --muted: #97A3C7;
  --line: #2A3763;
  --line-soft: rgba(42, 55, 99, .6);
  --pink: #FF5F8F;
  --open-cyan: #35E0FF;
  --legacy-purple: #5B3FA8;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --maxw: 1440px;
  --pad-x: clamp(16px, 3.2vw, 40px);
  --radius: 2px;

  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, .55);
  --shadow-neon: 0 0 0 1px rgba(124, 77, 255, .5), 0 14px 42px -22px rgba(124, 77, 255, .95);
  --shadow-cyan: 0 0 0 1px rgba(34, 211, 238, .45), 0 16px 44px -24px rgba(34, 211, 238, .9);
}

/* 3. 视口底纹：扫描线 + 霓虹辉光 ----------------------------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(70vw 55vw at 6% -14%, rgba(124, 77, 255, .20), transparent 62%),
    radial-gradient(52vw 44vw at 104% 2%, rgba(34, 211, 238, .13), transparent 60%),
    radial-gradient(64vw 60vw at 50% 118%, rgba(124, 77, 255, .11), transparent 66%),
    repeating-linear-gradient(to bottom, rgba(150, 175, 255, .028) 0 1px, transparent 1px 4px);
}
.xp-header, .xp-main, .xp-footer, .xp-backtop, .xp-skip { position: relative; z-index: 1; }

/* 4. 焦点态 ------------------------------------------------ */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* 5. 跳转链接 ---------------------------------------------- */
.xp-skip {
  position: absolute;
  left: 50%;
  top: -70px;
  z-index: 200;
  padding: 12px 22px;
  transform: translateX(-50%);
  background: var(--cyan);
  color: #04121A;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top .18s ease;
}
.xp-skip:focus { top: 0; }

/* 6. 头部 -------------------------------------------------- */
.xp-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(7, 12, 30, .97) 0%, rgba(9, 15, 36, .90) 100%);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px) saturate(1.25);
  backdrop-filter: blur(12px) saturate(1.25);
  transition: box-shadow .24s ease;
}
.xp-header[data-compact] { box-shadow: 0 18px 40px -28px rgba(0, 0, 0, .98); }

.xp-header__rail {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(14px, 2.4vw, 40px);
  width: 100%;
  max-width: var(--maxw);
  min-height: 78px;
  margin: 0 auto;
  padding: 16px var(--pad-x);
  transition: min-height .24s ease, padding .24s ease;
}
.xp-header[data-compact] .xp-header__rail { min-height: 56px; padding-block: 8px; }

.xp-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--purple), var(--cyan) 62%, var(--gold));
  box-shadow: 0 0 14px rgba(34, 211, 238, .8);
  will-change: transform;
}

/* 品牌 ------------------------------------------------------ */
.xp-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 4px 2px;
  line-height: 1;
  white-space: nowrap;
}
.xp-brand__mark {
  font-size: clamp(19px, 1.9vw, 23px);
  font-weight: 900;
  letter-spacing: .04em;
  color: var(--ink);
  text-shadow: 0 0 20px rgba(124, 77, 255, .6);
}
.xp-brand__tail {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: clamp(10px, .95vw, 12px);
  font-weight: 700;
  letter-spacing: .30em;
  color: var(--cyan);
}
.xp-brand__tail::before {
  content: "";
  width: 14px;
  height: 2px;
  background: var(--purple);
  box-shadow: 0 0 10px var(--purple);
}
.xp-brand__ver {
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--violet);
  background: rgba(124, 77, 255, .12);
  border: 1px solid rgba(124, 77, 255, .5);
  border-radius: var(--radius);
}
.xp-brand:hover .xp-brand__mark { color: #fff; text-shadow: 0 0 26px rgba(34, 211, 238, .75); }

/* 主导航 ---------------------------------------------------- */
.xp-nav { min-width: 0; }
.xp-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 2px;
}
.xp-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--muted);
  border-radius: var(--radius);
  transition: color .18s ease, background-color .18s ease;
}
.xp-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s ease;
}
.xp-nav__link:hover { color: var(--ink); background: rgba(124, 77, 255, .13); }
.xp-nav__link:hover::after { transform: scaleX(1); }
.xp-nav__link[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}
.xp-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}

/* 头部工具区 ------------------------------------------------ */
.xp-header__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-self: end;
}

/* 7. 按钮 -------------------------------------------------- */
.xp-btn {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-bd: var(--line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .02em;
  white-space: nowrap;
  transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease, color .16s ease, border-color .16s ease;
}
.xp-btn:hover { transform: translateY(-2px); }
.xp-btn:active { transform: translateY(0); }
.xp-btn--sm { padding: 7px 12px; font-size: 13px; }
.xp-btn--primary {
  --btn-bg: var(--purple);
  --btn-fg: #FFFFFF;
  --btn-bd: #9B7BFF;
  box-shadow: 4px 4px 0 rgba(34, 211, 238, .28);
}
.xp-btn--primary:hover { background: #8A60FF; box-shadow: 6px 6px 0 rgba(34, 211, 238, .45); }
.xp-btn--ghost {
  --btn-bg: rgba(16, 26, 56, .72);
  --btn-fg: var(--violet);
  --btn-bd: var(--line);
}
.xp-btn--ghost:hover { --btn-fg: var(--ink); --btn-bd: var(--violet); }
.xp-btn--gold {
  --btn-bg: rgba(247, 193, 75, .13);
  --btn-fg: var(--gold);
  --btn-bd: rgba(247, 193, 75, .5);
}
.xp-btn--gold:hover { background: rgba(247, 193, 75, .22); }
.xp-search::before {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(34, 211, 238, .7);
}

/* 移动导航按钮 ---------------------------------------------- */
.xp-navtoggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: rgba(16, 26, 56, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
}
.xp-navtoggle:hover { border-color: var(--violet); }
.xp-navtoggle__bars { display: grid; gap: 3px; width: 18px; }
.xp-navtoggle__bars i {
  display: block;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 6px rgba(34, 211, 238, .85);
  transition: transform .2s ease, opacity .2s ease;
}
.xp-navtoggle[aria-expanded="true"] .xp-navtoggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.xp-navtoggle[aria-expanded="true"] .xp-navtoggle__bars i:nth-child(2) { opacity: 0; }
.xp-navtoggle[aria-expanded="true"] .xp-navtoggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 8. 通用布局 ---------------------------------------------- */
.xp-main { display: block; }
.xp-shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}
.xp-section { padding-block: clamp(36px, 5vw, 72px); }
.xp-stack { display: flex; flex-direction: column; gap: clamp(12px, 1.6vw, 20px); }
.xp-stack--tight { gap: 8px; }
.xp-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }

.xp-row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 1.8vw, 26px);
}
.xp-col-3 { grid-column: span 3; }
.xp-col-4 { grid-column: span 4; }
.xp-col-5 { grid-column: span 5; }
.xp-col-6 { grid-column: span 6; }
.xp-col-7 { grid-column: span 7; }
.xp-col-8 { grid-column: span 8; }
.xp-col-9 { grid-column: span 9; }
.xp-col-12 { grid-column: span 12; }

.xp-grid { display: grid; gap: clamp(12px, 1.8vw, 22px); }
.xp-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.xp-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.xp-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.xp-grid--auto { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

/* 9. 文本层级 ---------------------------------------------- */
.xp-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.xp-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(247, 193, 75, .7);
}
.xp-display {
  font-size: clamp(30px, 5.4vw, 68px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--ink);
  transform: skewX(-2deg);
  text-shadow: 2px 2px 0 rgba(124, 77, 255, .45);
}
.xp-title {
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.005em;
  color: var(--ink);
}
.xp-subtitle { font-size: clamp(17px, 1.6vw, 21px); font-weight: 700; color: var(--ink); }
.xp-lede {
  max-width: 38em;
  font-size: clamp(15.5px, 1.25vw, 18px);
  line-height: 1.7;
  color: #C9D3F0;
}
.xp-note {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--muted);
}
.xp-mono { font-family: var(--font-mono); letter-spacing: .04em; font-variant-numeric: tabular-nums; }
.xp-prose { max-width: 38em; font-size: 16.5px; line-height: 1.75; color: #D3DAF2; }
.xp-prose p + p { margin-top: 1.1em; }
.xp-prose h3 { margin-top: 1.6em; font-size: 19px; font-weight: 800; color: var(--ink); }
.xp-prose ul { margin-top: 1em; padding-left: 1.1em; list-style: square; }
.xp-prose li + li { margin-top: .5em; }
.xp-prose strong { color: #FFFFFF; font-weight: 700; }
.xp-prose a { color: var(--cyan); border-bottom: 1px solid rgba(34, 211, 238, .42); }
.xp-prose a:hover { border-bottom-color: var(--cyan); }

.xp-rule { height: 1px; margin: 0; border: 0; background: var(--line); }
.xp-rule--neon { height: 2px; background: linear-gradient(90deg, transparent, var(--purple), var(--cyan), transparent); }

/* 10. 面包屑 ----------------------------------------------- */
.xp-crumb { padding-block: clamp(16px, 2vw, 26px) 0; }
.xp-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--muted);
}
.xp-crumb__list li { display: flex; align-items: center; gap: 8px; }
.xp-crumb__list li + li::before { content: "//"; color: var(--line); }
.xp-crumb__list a { color: var(--muted); transition: color .16s ease; }
.xp-crumb__list a:hover { color: var(--cyan); }
.xp-crumb__list [aria-current="page"] { color: var(--ink); }

/* 11. 面板 / 卡片 / 标签 / 代码 ---------------------------- */
.xp-panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(180deg, rgba(16, 26, 56, .93), rgba(12, 20, 48, .93));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.xp-panel--hard { border-color: #33417A; box-shadow: var(--shadow-hard); }

.xp-card {
  position: relative;
  display: block;
  padding: clamp(16px, 2vw, 22px);
  background: linear-gradient(180deg, rgba(16, 26, 56, .94), rgba(11, 17, 40, .94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
a.xp-card:hover {
  transform: translateY(-6px);
  border-color: var(--violet);
  box-shadow: var(--shadow-neon);
}

.xp-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: rgba(16, 26, 56, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--muted);
  transition: color .16s ease, border-color .16s ease, background-color .16s ease, box-shadow .16s ease;
}
.xp-tag:hover { color: var(--ink); border-color: var(--violet); }
.xp-tag[aria-pressed="true"],
.xp-tag--on {
  color: #04121A;
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
  box-shadow: 0 0 18px -4px rgba(34, 211, 238, .9);
}
.xp-tag--gold {
  color: var(--gold);
  background: rgba(247, 193, 75, .12);
  border-color: rgba(247, 193, 75, .55);
}

.xp-code {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(247, 193, 75, .10);
  border: 1px dashed rgba(247, 193, 75, .55);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--gold);
}

/* 12. 图片容器（供页面阶段放图） --------------------------- */
.xp-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 12% 8%, rgba(124, 77, 255, .34), transparent 58%),
    radial-gradient(100% 100% at 92% 96%, rgba(34, 211, 238, .24), transparent 60%),
    linear-gradient(135deg, #131C3C, #0B1130 60%, #1A1240);
}
.xp-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(150, 175, 255, .06) 0 1px, transparent 1px 4px);
}
.xp-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.9) contrast(1.06);
}
.xp-media--16x9 { aspect-ratio: 16 / 9; }
.xp-media--4x3 { aspect-ratio: 4 / 3; }
.xp-media--1x1 { aspect-ratio: 1 / 1; }
.xp-media--21x9 { aspect-ratio: 21 / 9; }
.xp-media--3x4 { aspect-ratio: 3 / 4; }

/* 13. 章节目录与渐显 --------------------------------------- */
.xp-toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 2px solid var(--line);
}
.xp-toc a {
  display: block;
  margin-left: -2px;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}
.xp-toc a:hover { color: var(--ink); background: rgba(124, 77, 255, .12); }
.xp-toc a.is-active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 211, 238, .08);
}

.xp-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}
.xp-js [data-reveal].is-in { opacity: 1; transform: none; }

/* 14. 页脚 ------------------------------------------------- */
.xp-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, #070C1E 0%, #0A1130 55%, #070C1E 100%);
  border-top: 3px solid var(--purple);
  box-shadow: 0 -22px 64px -44px rgba(124, 77, 255, .95);
}
.xp-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 260px;
  pointer-events: none;
  background: radial-gradient(60% 100% at 50% 100%, rgba(124, 77, 255, .16), transparent 70%);
}
.xp-footer__layer { position: relative; border-top: 1px solid var(--line); }
.xp-footer__layer:first-child { border-top: 0; }

.xp-footer__slogans {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 28px);
  padding-block: clamp(22px, 3vw, 34px);
}
.xp-footer__slogans li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}
.xp-footer__sn {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.xp-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 48px);
  padding-block: clamp(28px, 4vw, 52px);
}
.xp-footer__title {
  margin-bottom: 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.xp-footer__list li + li { margin-top: 9px; }
.xp-footer__list a {
  display: inline-block;
  font-size: 14.5px;
  color: #C3CCE8;
  transition: color .16s ease, transform .16s ease;
}
.xp-footer__list a:hover { color: var(--cyan); transform: translateX(4px); }

/* CN 导航折叠轨道 */
.xp-cnnav__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 11px 14px;
  background: rgba(91, 63, 168, .18);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  transition: border-color .18s ease, background-color .18s ease;
}
.xp-cnnav__toggle:hover { border-color: var(--violet); background: rgba(91, 63, 168, .30); }
.xp-cnnav__sign {
  flex: none;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--violet);
  transition: transform .22s ease, color .22s ease;
}
.xp-cnnav__toggle[aria-expanded="true"] .xp-cnnav__sign { transform: rotate(45deg); color: var(--cyan); }
.xp-cnnav__panel {
  margin-top: 10px;
  padding: 14px 16px;
  background: rgba(11, 17, 40, .88);
  border: 1px dashed rgba(91, 63, 168, .75);
  border-radius: var(--radius);
}
.xp-cnnav__hint {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--muted);
}
.xp-cnnav__steps li + li { margin-top: 8px; }
.xp-cnnav__steps a {
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--violet);
  transition: color .16s ease, border-color .16s ease;
}
.xp-cnnav__steps a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* 联系层 */
.xp-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 28px);
  padding-block: clamp(24px, 3.5vw, 40px);
}
.xp-contact__item {
  display: block;
  padding: 16px 18px;
  background: rgba(16, 26, 56, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
a.xp-contact__item:hover { transform: translateY(-3px); border-color: var(--violet); box-shadow: var(--shadow-hard); }
.xp-contact__k {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}
.xp-contact__v {
  display: block;
  font-size: 15px;
  color: var(--ink);
  word-break: break-all;
}
.xp-contact__note {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

/* 法务层 */
.xp-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding-block: 20px 30px;
}
.xp-footer__reg {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--muted);
}
.xp-footer__legallist { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.xp-footer__legallist a {
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px dashed transparent;
  transition: color .16s ease, border-color .16s ease;
}
.xp-footer__legallist a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* 15. 返回顶部 --------------------------------------------- */
.xp-backtop {
  position: fixed;
  right: clamp(14px, 2vw, 28px);
  bottom: clamp(14px, 2vw, 28px);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: rgba(16, 26, 56, .94);
  border: 1px solid var(--violet);
  border-radius: var(--radius);
  color: var(--cyan);
  box-shadow: 4px 4px 0 rgba(124, 77, 255, .35);
  opacity: 0;
  transform: translateX(20px);
  pointer-events: none;
  transition: opacity .24s ease, transform .24s ease, border-color .16s ease, color .16s ease;
}
.xp-backtop::before {
  content: "";
  width: 11px;
  height: 11px;
  margin-top: 4px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg);
}
.xp-backtop[data-visible] { opacity: 1; transform: translateX(0); pointer-events: auto; }
.xp-backtop:hover { border-color: var(--cyan); color: var(--gold); transform: translateY(-3px); }

/* 16. 断点 ------------------------------------------------- */
@media (max-width: 1024px) {
  .xp-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-row { gap: 14px; }
  .xp-col-3, .xp-col-4, .xp-col-5 { grid-column: span 6; }
}

@media (max-width: 1000px) {
  .xp-header__rail { grid-template-columns: minmax(0, 1fr) auto; }
  .xp-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    padding: 8px var(--pad-x) 20px;
    background: linear-gradient(180deg, #0C1430, #101A38);
    border-top: 1px solid var(--line);
    border-bottom: 3px solid var(--purple);
  }
  .xp-nav[data-open] { display: block; animation: xp-drop .22s ease-out; }
  .xp-nav__list { flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 0; }
  .xp-nav__item { border-bottom: 1px solid var(--line-soft); }
  .xp-nav__item:last-child { border-bottom: 0; }
  .xp-nav__link { display: block; padding: 15px 4px; font-size: 16px; }
  .xp-nav__link::after { left: 4px; right: auto; bottom: 10px; width: 18px; }
  .xp-nav__link:hover::after { transform: scaleX(1); }
  .xp-navtoggle { display: inline-flex; }
  .xp-brand__ver { display: none; }
}

@keyframes xp-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .xp-footer__slogans { grid-template-columns: 1fr; }
  .xp-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .xp-footer__col:last-child { grid-column: 1 / -1; }
  .xp-contact { grid-template-columns: 1fr; }
  .xp-row { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .xp-grid--2, .xp-grid--3, .xp-grid--4, .xp-grid--auto { grid-template-columns: 1fr; }
  .xp-row { grid-template-columns: 1fr; }
  .xp-col-3, .xp-col-4, .xp-col-5, .xp-col-6, .xp-col-7, .xp-col-8, .xp-col-9, .xp-col-12 { grid-column: 1 / -1; }
  .xp-footer__grid { grid-template-columns: 1fr; }
  .xp-footer__legal { justify-content: flex-start; }
  .xp-display { transform: skewX(-1.5deg); }
}

@media (max-width: 560px) {
  .xp-header__tools .xp-btn--ghost { display: none; }
}

@media (max-width: 480px) {
  .xp-navtoggle__text { display: none; }
  .xp-navtoggle { padding: 9px 10px; }
  .xp-footer__slogans li { font-size: 13.5px; }
}

/* 17. 减少动效 --------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .xp-js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .xp-backtop { transform: none; }
}