/* ============================================================
   AGE·免费进入 — /assets/site.css
   夜间路线图系统：深夜蓝底 + 72px 精密网格 + 通行绿信号
   ============================================================ */

:root {
  --night: #06121F;
  --teal: #0A2230;
  --pass: #2BE08A;
  --cyan: #45D9FF;
  --amber: #FF8A3D;
  --indigo: #34265F;
  --wine: #521B30;
  --mist: #E9F3F7;
  --slate: #91A8B6;
  --grid: #163244;
  --mint: #B9FFD9;

  --shell: 1280px;
  --pad: 48px;
  --head-h: 64px;

  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (max-width: 767px) {
  :root { --pad: 20px; --head-h: 56px; }
}

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--head-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--mist);
  background-color: var(--night);
  background-image:
    linear-gradient(to right, rgba(22, 50, 68, .55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(22, 50, 68, .55) 1px, transparent 1px),
    radial-gradient(1200px 620px at 12% -10%, rgba(52, 38, 95, .38), transparent 70%),
    radial-gradient(900px 520px at 96% 4%, rgba(10, 34, 48, .85), transparent 68%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  background-attachment: fixed, fixed, fixed, fixed;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .5em;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--mist);
}

p { margin: 0 0 1em; }

a { color: var(--cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--pass); }

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

ul, ol { margin: 0; padding: 0; }

button { font: inherit; color: inherit; }

hr { border: 0; border-top: 1px solid var(--grid); margin: 32px 0; }

::selection { background: var(--pass); color: var(--night); }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 0;
}

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

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  z-index: 200;
  transform: translateY(-160%);
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  background: var(--pass);
  color: var(--night);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-decoration: none;
  border: 1px solid var(--mint);
  transition: transform .18s var(--ease);
}
.skip-link:focus-visible,
.skip-link:focus { transform: translateY(0); color: var(--night); }

/* ============================================================
   HEADER — 紧凑命令栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6, 18, 31, .93);
  border-bottom: 1px solid var(--grid);
  -webkit-backdrop-filter: blur(9px);
  backdrop-filter: blur(9px);
  transition: background .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.site-header[data-scrolled="true"] {
  background: rgba(6, 18, 31, .995);
  border-bottom-color: #1f4459;
  box-shadow: 0 1px 0 rgba(69, 217, 255, .2), 0 10px 30px rgba(0, 0, 0, .38);
}

.cmdbar {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad);
  min-height: var(--head-h);
  display: flex;
  align-items: center;
  gap: 22px;
}

/* 品牌 */
.brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--mist);
}
.brand:hover { color: var(--mist); }
.brand__mark {
  width: 16px; height: 16px;
  display: grid;
  place-items: center;
  border: 1px solid var(--pass);
  background: rgba(43, 224, 138, .08);
  transition: box-shadow .2s var(--ease), background .2s var(--ease);
}
.brand__dot {
  width: 6px; height: 6px;
  background: var(--pass);
  display: block;
}
.brand:hover .brand__mark,
.brand:focus-visible .brand__mark {
  background: rgba(43, 224, 138, .22);
  box-shadow: 0 0 16px rgba(43, 224, 138, .45);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-weight: 900;
  font-size: 16px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand__tagline {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--slate);
  white-space: nowrap;
}

/* 栏目索引 */
.nav {
  flex: 1 1 auto;
  display: flex;
  align-items: stretch;
  justify-content: center;
  min-width: 0;
}
.nav__list {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
}
.nav__item {
  display: flex;
  border-left: 1px solid var(--grid);
}
.nav__item:last-child { border-right: 1px solid var(--grid); }

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 13px;
  text-decoration: none;
  color: var(--mist);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: color .18s var(--ease), background .18s var(--ease), box-shadow .18s var(--ease);
}
.nav__link:hover { color: var(--pass); background: rgba(43, 224, 138, .07); }
.nav__link:focus-visible { outline: 2px solid var(--cyan); outline-offset: -3px; }
.nav__idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--slate);
  transition: color .18s var(--ease);
}
.nav__link:hover .nav__idx { color: var(--cyan); }
.nav__link[aria-current="page"] {
  color: var(--pass);
  background: rgba(43, 224, 138, .1);
  box-shadow: inset 0 -2px 0 var(--pass);
}
.nav__link[aria-current="page"] .nav__idx { color: var(--pass); }

.nav__link::after {
  content: attr(data-hint);
  position: absolute;
  left: -1px;
  top: 100%;
  z-index: 6;
  padding: 7px 11px;
  background: var(--teal);
  border: 1px solid var(--grid);
  border-top: 1px solid var(--cyan);
  color: var(--slate);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .05em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(-5px);
  pointer-events: none;
  transition: opacity .18s var(--ease), transform .18s var(--ease);
}
@media (min-width: 1100px) {
  .nav__link:hover::after,
  .nav__link:focus-visible::after { opacity: 1; transform: translateY(0); }
}

.nav__cta { display: none; }

/* 状态区 */
.cmdbar__status {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}
.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--slate);
  text-transform: uppercase;
}
.status__dot {
  width: 7px; height: 7px;
  background: var(--pass);
  box-shadow: 0 0 0 3px rgba(43, 224, 138, .16);
  animation: agePulse 2.8s ease-in-out infinite;
}
@keyframes agePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .32; }
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--pass);
  background: transparent;
  color: var(--pass);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .04em;
  text-decoration: none;
  border-radius: 0;
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), box-shadow .18s var(--ease);
}
.btn:hover,
.btn:focus-visible {
  background: var(--pass);
  color: var(--night);
  box-shadow: 0 0 0 1px var(--pass), 0 0 22px rgba(43, 224, 138, .38);
}
.btn:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.btn--gate { background: rgba(43, 224, 138, .1); }
.btn--bar { display: inline-flex; }

/* 移动索引按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--grid);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  cursor: pointer;
  border-radius: 0;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--pass); color: var(--pass); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px; height: 9px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: var(--pass);
  transition: transform .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.site-header[data-open="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }

/* 进度轨 */
.progress {
  height: 2px;
  background: var(--grid);
  overflow: hidden;
}
.progress__bar {
  display: block;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, var(--pass), var(--cyan));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .12s linear;
}

/* ---------- 头部响应式 ---------- */
@media (max-width: 1199px) {
  .status__text { display: none; }
  .cmdbar { gap: 14px; }
  .nav__link { padding: 10px 10px; font-size: 13px; }
}

@media (max-width: 1023px) {
  .cmdbar { justify-content: space-between; gap: 12px; }
  .btn--bar { display: none; }
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    background: #071825;
    border-bottom: 1px solid var(--grid);
    box-shadow: 0 22px 44px rgba(0, 0, 0, .55);
    max-height: calc(100vh - var(--head-h));
    overflow-y: auto;
  }
  .site-header[data-open="true"] .nav { display: flex; }

  .nav__list { flex-direction: column; align-items: stretch; }
  .nav__item {
    border-left: 0;
    border-top: 1px solid var(--grid);
  }
  .nav__item:last-child { border-right: 0; border-bottom: 0; }
  .nav__link {
    padding: 15px var(--pad);
    font-size: 15px;
    justify-content: flex-start;
    gap: 12px;
  }
  .nav__link::after { display: none; }
  .nav__link[aria-current="page"] { box-shadow: inset 3px 0 0 var(--pass); }

  .nav__cta { display: block; padding: 18px var(--pad) 22px; }
  .nav__cta .btn { width: 100%; padding: 13px 18px; }
}

@media (max-width: 480px) {
  .brand__tagline { display: none; }
  .nav-toggle__text { display: none; }
}

/* ============================================================
   FOOTER — 路线终点站
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: 0;
  background: linear-gradient(180deg, var(--teal) 0%, #071825 78%, var(--night) 100%);
  border-top: 1px solid var(--grid);
  color: var(--mist);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 240px; height: 2px;
  background: linear-gradient(90deg, var(--pass), rgba(43, 224, 138, 0));
}

.footer__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--pad) 44px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.35fr;
  gap: 44px 34px;
  align-items: start;
}

.footer__brand { min-width: 0; }
.footer__name {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--mist);
}
.footer__tagline {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--pass);
  text-transform: uppercase;
}
.footer__scope {
  margin: 0;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--slate);
}

.footer__col { min-width: 0; }
.footer__head {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--grid);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.footer__link {
  position: relative;
  display: inline-block;
  padding-left: 12px;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color .16s var(--ease), padding-left .16s var(--ease);
}
.footer__link::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 4px; height: 1px;
  background: var(--slate);
  transition: background .16s var(--ease), width .16s var(--ease);
}
.footer__link:hover { color: var(--pass); padding-left: 16px; }
.footer__link:hover::before { background: var(--pass); width: 8px; }
.footer__link:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.contact-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.contact-list__item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2px 10px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(22, 50, 68, .9);
}
.contact-list__label {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--slate);
  text-transform: uppercase;
}
.contact-list__value {
  font-size: 13.5px;
  color: var(--mist);
  word-break: break-word;
}
.copy {
  align-self: center;
  padding: 4px 9px;
  background: transparent;
  border: 1px solid var(--grid);
  color: var(--slate);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  cursor: pointer;
  border-radius: 0;
  transition: color .16s var(--ease), border-color .16s var(--ease), background .16s var(--ease);
}
.copy:hover { color: var(--night); background: var(--cyan); border-color: var(--cyan); }
.copy[data-copied="true"] { color: var(--night); background: var(--pass); border-color: var(--pass); }

.footer__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--slate);
}

.footer__base {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--pad) 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--grid);
}
.footer__legal,
.footer__addr {
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .07em;
  color: var(--slate);
}
.footer__addr { color: var(--grid); }
.footer__addr:hover { color: var(--slate); }

@media (max-width: 1023px) {
  .footer__inner { grid-template-columns: 1fr 1fr; padding-top: 48px; gap: 36px 28px; }
  .footer__brand { grid-column: 1 / -1; }
  .footer__scope { max-width: 52ch; }
}
@media (max-width: 600px) {
  .footer__inner { grid-template-columns: 1fr; padding: 40px var(--pad) 32px; gap: 30px; }
  .footer__base { flex-direction: column; align-items: flex-start; }
  .footer__name { font-size: 21px; }
}

/* ============================================================
   通用容器与排版
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--mist);
}
.prose > * + * { margin-top: 1.05em; }
.prose p { margin: 0; }
.prose h2 { font-size: clamp(24px, 3vw, 32px); margin: 1.6em 0 .4em; }
.prose h3 { font-size: 20px; margin: 1.4em 0 .3em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .35em 0; }

.measure { max-width: 68ch; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--cyan);
}

.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0 0 .35em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--grid);
  background: rgba(69, 217, 255, .06);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.tag--pass {
  border-color: rgba(43, 224, 138, .5);
  background: rgba(43, 224, 138, .1);
  color: var(--pass);
}
.tag--amber {
  border-color: rgba(255, 138, 61, .5);
  background: rgba(255, 138, 61, .11);
  color: var(--amber);
}

.rule {
  height: 1px;
  width: 100%;
  border: 0;
  background: var(--grid);
  margin: 40px 0;
}

.panel {
  background: var(--teal);
  border: 1px solid var(--grid);
  padding: 26px;
}
.panel--amber { border-color: rgba(255, 138, 61, .45); background: rgba(82, 27, 48, .28); }
.panel--indigo { border-color: rgba(52, 38, 95, .9); background: rgba(52, 38, 95, .32); }

.split {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 900px) {
  .split { grid-template-columns: 1fr; gap: 28px; }
}

.stack { display: grid; gap: 18px; }
.stack--tight { gap: 10px; }
.stack--wide { gap: 32px; }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .09em;
  color: var(--slate);
}
.breadcrumb__item { color: var(--slate); text-decoration: none; }
.breadcrumb__item:hover { color: var(--cyan); }
.breadcrumb__sep { color: var(--grid); }
.breadcrumb [aria-current="page"] { color: var(--pass); }

/* 表格 */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--grid);
  background: rgba(10, 34, 48, .55);
  -webkit-overflow-scrolling: touch;
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 620px;
}
.data-table caption {
  padding: 12px 16px;
  text-align: left;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--slate);
  border-bottom: 1px solid var(--grid);
}
.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--grid);
  vertical-align: top;
}
.data-table thead th {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--cyan);
  text-transform: uppercase;
  background: rgba(6, 18, 31, .7);
  white-space: nowrap;
}
.data-table tbody tr:hover { background: rgba(43, 224, 138, .06); }
.data-table .is-num { font-family: var(--mono); text-align: right; white-space: nowrap; }
.data-table .is-highlight { background: rgba(255, 138, 61, .1); box-shadow: inset 0 0 0 1px rgba(255, 138, 61, .32); }

/* 图片容器基础规则 */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--grid);
  background:
    radial-gradient(120% 120% at 12% 0%, rgba(69, 217, 255, .16), transparent 58%),
    linear-gradient(160deg, #0B2637 0%, #071A27 58%, #0A2230 100%);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(69, 217, 255, .12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(69, 217, 255, .12) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: .55;
}
.media img,
.media video,
.media svg {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media__caption {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .07em;
  color: var(--slate);
}

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: rgba(10, 34, 48, .96);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  cursor: pointer;
  border-radius: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease), background .18s var(--ease), color .18s var(--ease);
}
.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { background: var(--cyan); color: var(--night); }
.to-top:focus-visible { outline: 2px solid var(--pass); outline-offset: 3px; }

@media (max-width: 600px) {
  .to-top { right: 14px; bottom: 14px; padding: 9px 12px; }
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .status__dot { animation: none; }
  .progress__bar { transition: none; }
  .to-top { transform: none; }
}