/* ============================================================
   365游戏礼包 · 共享样式 /assets/site.css
   夜间数字航站楼体系：深墨蓝底 + 电光青/暖橙行动色 + 霓虹紫强调
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --ink-900: #0A1424;
  --ink-800: #0E1C31;
  --ink-700: #12233B;
  --ink-600: #172B45;
  --paper: #F3EADF;
  --paper-2: #E6D9C7;
  --cyan: #26E0E6;
  --cyan-dim: #1AA9B0;
  --amber: #FF8A3D;
  --violet: #A76BFF;
  --green: #38D996;
  --mist: #E9F0F8;
  --slate: #8EA3B8;
  --deep-ink: #101C2E;

  --line: rgba(142, 163, 184, 0.22);
  --line-strong: rgba(142, 163, 184, 0.42);

  --container: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 74px;
  --cut: 18px;
  --radius: 2px;

  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: var(--font-display);
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--mist);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 88% -12%, rgba(38, 224, 230, 0.10), transparent 62%),
    radial-gradient(860px 480px at 2% 4%, rgba(167, 107, 255, 0.09), transparent 64%),
    linear-gradient(180deg, #0A1424 0%, #0A1424 60%, #08111F 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.16;
}

p, ul, ol, figure, dl { margin: 0; }
ul, ol { padding: 0; list-style: none; }
figure { margin-inline: 0; }

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

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

img, svg, picture { display: block; max-width: 100%; }
img { height: auto; }

h1 { font-size: clamp(30px, 5vw, 58px); }
h2 { font-size: clamp(22px, 3vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 22px); }

/* ---------- 可访问焦点 ---------- */
:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 11px 22px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transform: translateY(-220%);
  transition: transform 0.24s var(--ease);
}
.skip-link:focus-visible,
.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid var(--ink-900);
  outline-offset: 2px;
}

/* ---------- 阅读进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 130;
  background: rgba(142, 163, 184, 0.14);
  pointer-events: none;
}
.scroll-progress > span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--violet) 52%, var(--amber) 100%);
}

/* ============================================================
   页头
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.28s var(--ease), border-color 0.28s var(--ease),
    box-shadow 0.28s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(10, 20, 36, 0.94);
  border-bottom-color: var(--line);
  box-shadow: 0 22px 46px -34px rgba(0, 0, 0, 0.95);
}

.hdr-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: var(--header-h);
}

/* 品牌 */
.hdr-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
}
.hdr-brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: none;
  background: linear-gradient(150deg, var(--cyan) 0%, #10939C 72%, #0E7A8A 100%);
  clip-path: polygon(0 0, 100% 0, 100% 66%, 66% 100%, 0 100%);
  transition: transform 0.24s var(--ease);
}
.hdr-brand:hover .hdr-brand-mark { transform: translateY(-2px); }
.hdr-brand-slash {
  width: 15px;
  height: 3px;
  background: var(--ink-900);
  transform: rotate(-42deg);
  box-shadow: 0 6px 0 var(--ink-900);
}
.hdr-brand-text {
  display: grid;
  gap: 1px;
  line-height: 1.15;
}
.hdr-brand-name {
  font-size: 16.5px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.hdr-brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

/* 导航 */
.hdr-nav-wrap {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
}
.hdr-nav { min-width: 0; max-width: 100%; }
.hdr-nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.9vw, 10px);
}
.hdr-nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--slate);
  white-space: nowrap;
  border-radius: var(--radius);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.hdr-nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s var(--ease);
}
.hdr-nav-link:hover,
.hdr-nav-link:focus-visible { color: var(--mist); }
.hdr-nav-link:hover::after,
.hdr-nav-link:focus-visible::after { transform: scaleX(1); }
.hdr-nav-link[aria-current="page"] {
  color: var(--ink-900);
  background: var(--cyan);
  font-weight: 700;
  padding-inline: 14px;
}
.hdr-nav-link[aria-current="page"]::after {
  left: 6px;
  right: 6px;
  bottom: 3px;
  height: 3px;
  background: var(--ink-900);
  opacity: 0.32;
  transform: scaleX(1) skewX(-24deg);
}

/* 动作区 */
.hdr-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: none;
}
.hdr-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink-900);
  background: var(--amber);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 11px 100%, 0 calc(100% - 11px));
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.hdr-cta::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--ink-900);
  transform: rotate(45deg);
  flex: none;
}
.hdr-cta:hover,
.hdr-cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -16px rgba(255, 138, 61, 0.9);
}
.hdr-cta:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--mist);
}

/* 移动菜单按钮 */
.hdr-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--mist);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.hdr-toggle:hover { border-color: var(--cyan); background: rgba(38, 224, 230, 0.09); }
.hdr-toggle:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--cyan); }
.hdr-toggle-bars { display: grid; gap: 4px; width: 16px; }
.hdr-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform 0.26s var(--ease), opacity 0.18s var(--ease);
}
.site-header[data-open="true"] .hdr-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open="true"] .hdr-toggle-bar:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .hdr-toggle-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.hdr-toggle-label { white-space: nowrap; }

/* ---------- 页头平板/手机 ---------- */
@media (max-width: 1080px) {
  .hdr-nav-link { padding-inline: 9px; font-size: 14px; }
  .hdr-brand-sub { display: none; }
}

@media (max-width: 900px) {
  .hdr-toggle { display: inline-flex; }
  .hdr-nav-wrap {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    background: rgba(10, 20, 36, 0.985);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 30px 50px -40px rgba(0, 0, 0, 1);
    transition: max-height 0.32s var(--ease);
  }
  .site-header[data-open="true"] .hdr-nav-wrap {
    max-height: min(62vh, 420px);
    overflow-y: auto;
  }
  .hdr-nav { padding: 12px var(--gutter) 16px; }
  .hdr-nav-list {
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    padding-bottom: 6px;
  }
  .hdr-nav-list::-webkit-scrollbar { height: 3px; }
  .hdr-nav-list::-webkit-scrollbar-thumb { background: var(--line-strong); }
  .hdr-nav-link {
    scroll-snap-align: start;
    padding: 10px 15px;
    font-size: 13.5px;
    color: var(--mist);
    background: rgba(233, 240, 248, 0.05);
    border: 1px solid var(--line);
  }
  .hdr-nav-link::after { display: none; }
  .hdr-nav-link[aria-current="page"] {
    background: var(--cyan);
    border-color: transparent;
    color: var(--ink-900);
  }
}

@media (max-width: 560px) {
  :root { --header-h: 64px; }
  .hdr-brand-name { font-size: 15px; }
  .hdr-brand-mark { width: 30px; height: 30px; }
  .hdr-brand-slash { width: 13px; height: 3px; box-shadow: 0 5px 0 var(--ink-900); }
  .hdr-cta { padding: 8px 12px; font-size: 12.5px; }
  .hdr-toggle-label { display: none; }
  .hdr-toggle { padding: 9px 11px; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  overflow: hidden;
  color: var(--mist);
  background: linear-gradient(180deg, #0C182A 0%, #08111F 100%);
  border-top: 1px solid var(--line);
}
.ft-slash {
  position: absolute;
  top: 0;
  right: 0;
  width: min(42%, 460px);
  height: 100%;
  background: linear-gradient(135deg, rgba(38, 224, 230, 0.12) 0%, rgba(167, 107, 255, 0.06) 44%, transparent 70%);
  clip-path: polygon(46% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.site-footer > .container { position: relative; z-index: 1; }

.ft-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(22px, 3.6vw, 54px);
  padding-block: clamp(36px, 5.6vw, 68px) clamp(24px, 3.6vw, 40px);
}

.ft-brand-name {
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 27px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.ft-brand-name::after {
  content: "";
  display: inline-block;
  width: 24px;
  height: 3px;
  margin-left: 12px;
  background: var(--cyan);
  vertical-align: middle;
  transform: skewX(-26deg);
}
.ft-brand-desc {
  margin-top: 12px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate);
}
.ft-note {
  margin-top: 16px;
  max-width: 38ch;
  padding-left: 11px;
  border-left: 2px solid var(--amber);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
}

.ft-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--cyan);
}
.ft-list { display: grid; gap: 10px; }

.ft-link {
  position: relative;
  display: inline-block;
  padding-left: 15px;
  font-size: 14.5px;
  color: var(--mist);
  opacity: 0.78;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease);
}
.ft-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-30deg);
  transition: width 0.2s var(--ease);
}
.ft-link:hover,
.ft-link:focus-visible { opacity: 1; color: var(--cyan); }
.ft-link:hover::before,
.ft-link:focus-visible::before { width: 11px; }

.ft-contact-row { display: grid; gap: 2px; }
.ft-contact-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--slate);
}
.ft-contact-value {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--mist);
  word-break: break-all;
}
.ft-contact-row--addr .ft-contact-value {
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.6;
  word-break: normal;
}

.ft-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-block: 18px 26px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--slate);
}
.ft-copy { color: var(--slate); }
.ft-legal { display: flex; flex-wrap: wrap; gap: 16px; }
.ft-legal-link {
  color: var(--slate);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.ft-legal-link:hover,
.ft-legal-link:focus-visible { color: var(--cyan); border-bottom-color: var(--cyan); }
.ft-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--slate);
}

@media (max-width: 960px) {
  .ft-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ft-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .ft-grid { grid-template-columns: minmax(0, 1fr); }
  .ft-brand { grid-column: auto; }
  .ft-icp { margin-left: 0; }
}

/* ============================================================
   通用布局与组件
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(40px, 6vw, 88px);
}
.section--tight { padding-block: clamp(22px, 3vw, 42px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 15px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-30deg);
  flex: none;
}

.stack { display: grid; gap: clamp(12px, 1.6vw, 20px); }

.grid-2 {
  display: grid;
  gap: clamp(14px, 1.8vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
}
.grid-3 {
  display: grid;
  gap: clamp(14px, 1.8vw, 24px);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}

/* Bento 底板：12 栏非对称模数 */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 1.5vw, 20px);
}
.bento > * { min-width: 0; }
@media (max-width: 700px) {
  .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* 切角面板 */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(158deg, var(--ink-700) 0%, #0C1A2D 72%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.panel--paper {
  background: var(--paper);
  color: var(--deep-ink);
  border-color: rgba(16, 28, 46, 0.14);
}
.panel--accent {
  background: linear-gradient(158deg, rgba(38, 224, 230, 0.17) 0%, rgba(12, 26, 45, 0.92) 64%);
  border-color: rgba(38, 224, 230, 0.42);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease),
    color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--mist); }
.btn--primary { background: var(--cyan); color: var(--ink-900); }
.btn--primary:hover { background: #56ECEF; }
.btn--primary:focus-visible { box-shadow: inset 0 0 0 2px var(--ink-900); }
.btn--amber { background: var(--amber); color: var(--ink-900); }
.btn--amber:hover { background: #FFA063; }
.btn--amber:focus-visible { box-shadow: inset 0 0 0 2px var(--ink-900); }
.btn--ghost { background: transparent; color: var(--mist); border-color: var(--line-strong); }
.btn--ghost:hover { color: var(--cyan); border-color: var(--cyan); }
.btn--paper { background: var(--paper); color: var(--deep-ink); }
.btn--paper:hover { background: var(--paper-2); }
.btn--paper:focus-visible { box-shadow: inset 0 0 0 2px var(--deep-ink); }

/* 分类标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--slate);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  white-space: nowrap;
}
.tag--cyan { color: var(--cyan); border-color: rgba(38, 224, 230, 0.5); background: rgba(38, 224, 230, 0.09); }
.tag--amber { color: var(--amber); border-color: rgba(255, 138, 61, 0.5); background: rgba(255, 138, 61, 0.09); }
.tag--violet { color: var(--violet); border-color: rgba(167, 107, 255, 0.5); background: rgba(167, 107, 255, 0.09); }
.tag--green { color: var(--green); border-color: rgba(56, 217, 150, 0.5); background: rgba(56, 217, 150, 0.09); }

/* 面包屑 */
.breadcrumb { padding-block: 16px 0; }
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--slate);
}
.breadcrumb-list > li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-list > li + li::before {
  content: "";
  width: 7px;
  height: 1px;
  background: var(--slate);
  transform: skewX(-30deg);
}
.breadcrumb-link { color: var(--slate); transition: color 0.2s var(--ease); }
.breadcrumb-link:hover,
.breadcrumb-link:focus-visible { color: var(--cyan); }
.breadcrumb-current { color: var(--mist); }

/* 长文阅读面 */
.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}
.prose p + p { margin-top: 1em; }
.prose h2 { margin-top: 1.7em; margin-bottom: 0.5em; }
.prose h3 { margin-top: 1.4em; margin-bottom: 0.4em; }
.prose strong { color: var(--cyan); font-weight: 700; }
.prose ul, .prose ol { margin-top: 0.8em; display: grid; gap: 0.5em; }
.prose ul > li, .prose ol > li { position: relative; padding-left: 18px; }
.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
  transform: skewX(-30deg);
}
.prose ol { counter-reset: prose-li; }
.prose ol > li::before {
  counter-increment: prose-li;
  content: counter(prose-li);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}
.panel--paper .prose,
.panel--paper .prose h2,
.panel--paper .prose h3 { color: var(--deep-ink); }
.panel--paper .prose strong { color: #0B7C86; }

/* 图片容器基础（页面阶段放置图片或占位） */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(142deg, var(--ink-700) 0%, #0A1626 100%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}
.media-frame > img,
.media-frame > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}
.media-frame--tall > img,
.media-frame--tall > picture > img { aspect-ratio: 4 / 5; }
.media-frame--square > img,
.media-frame--square > picture > img { aspect-ratio: 1 / 1; }
.media-frame--placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(135deg, rgba(38, 224, 230, 0.10) 0 2px, transparent 2px 11px),
    radial-gradient(120% 90% at 100% 0%, rgba(255, 138, 61, 0.14), transparent 62%);
  pointer-events: none;
}

/* 等宽参数标注 */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

/* ============================================================
   减少动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .btn:hover,
  .hdr-cta:hover,
  .hdr-brand:hover .hdr-brand-mark { transform: none; }
}