/* ===== 安信登录 · 共享样式 /assets/site.css ===== */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 118px;
}

body,
h1, h2, h3, h4,
p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }
img, svg { max-width: 100%; display: block; }
button { background: none; border: 0; font: inherit; color: inherit; }
a { color: inherit; }

:root {
  --ax-paper: #F6F3EC;
  --ax-white: #FFFFFF;
  --ax-ink: #0F3A31;
  --ax-ink-deep: #14544A;
  --ax-ink-mid: #2F7A6B;
  --ax-slate: #3E5A6B;
  --ax-slate-mid: #7C96A6;
  --ax-slate-soft: #C7D4DB;
  --ax-amber: #E08A2C;
  --ax-text: #17201F;

  --ax-line: rgba(15, 58, 49, 0.20);
  --ax-line-soft: rgba(62, 90, 107, 0.22);
  --ax-grid-line: rgba(15, 58, 49, 0.055);
  --ax-grid: 32px;
  --ax-rail-w: 0px;
  --ax-shell: 1320px;
  --ax-gutter: clamp(18px, 3vw, 40px);

  --ax-radius-lg: 28px;
  --ax-radius-md: 18px;
  --ax-radius-sm: 12px;
  --ax-radius-pill: 999px;

  --ax-font-sans: "Source Han Sans SC", "思源黑体", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --ax-font-serif: "Source Han Serif SC", "思源宋体", "Songti SC", Georgia, serif;
  --ax-font-mono: "JetBrains Mono", "Source Han Mono", "思源等宽", ui-monospace, SFMono-Regular, Menlo, monospace;

  --ax-shadow-soft: 0 22px 56px -36px rgba(15, 58, 49, 0.50);
  --ax-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ===== 基础与中文排版 ===== */
body {
  font-family: var(--ax-font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ax-text);
  background-color: var(--ax-paper);
  background-image:
    linear-gradient(to right, var(--ax-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ax-grid-line) 1px, transparent 1px);
  background-size: var(--ax-grid) var(--ax-grid);
  padding-left: var(--ax-rail-w);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ax-text);
  word-break: keep-all;
}
h1 { font-size: clamp(34px, 5vw, 64px); line-height: 1.08; }
h2 { font-size: clamp(26px, 3vw, 40px); }
h3 { font-size: clamp(20px, 1.7vw, 26px); font-weight: 800; }
h4 { font-size: 18px; font-weight: 800; }

p { text-wrap: pretty; }

:focus-visible {
  outline: 2px solid var(--ax-ink-mid);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== 容器 / 栅格 ===== */
.ax-shell {
  width: 100%;
  max-width: var(--ax-shell);
  margin-inline: auto;
  padding-inline: var(--ax-gutter);
}

.ax-main { display: block; }

.ax-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}
.ax-span-3 { grid-column: span 3; }
.ax-span-4 { grid-column: span 4; }
.ax-span-6 { grid-column: span 6; }
.ax-span-8 { grid-column: span 8; }
.ax-span-9 { grid-column: span 9; }
.ax-span-12 { grid-column: span 12; }

.ax-aside {
  font-size: 14px;
  color: var(--ax-slate);
}

/* ===== 画布与区块 ===== */
.ax-canvas {
  background-color: var(--ax-paper);
  background-image:
    linear-gradient(to right, var(--ax-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ax-grid-line) 1px, transparent 1px);
  background-size: var(--ax-grid) var(--ax-grid);
}
.ax-canvas--dense {
  background-image:
    linear-gradient(to right, rgba(15, 58, 49, 0.075) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 58, 49, 0.075) 1px, transparent 1px);
  background-size: 16px 16px;
}
.ax-canvas--sparse {
  background-image:
    linear-gradient(to right, rgba(15, 58, 49, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 58, 49, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
}
.ax-canvas--white { background-color: var(--ax-white); }
.ax-canvas--ink {
  background-color: var(--ax-ink);
  background-image:
    linear-gradient(to right, rgba(246, 243, 236, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(246, 243, 236, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ax-paper);
}
.ax-canvas--ink h1,
.ax-canvas--ink h2,
.ax-canvas--ink h3 { color: var(--ax-paper); }

.ax-section { padding-block: clamp(40px, 6vw, 88px); }

.ax-section__label {
  display: block;
  font-family: var(--ax-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ax-slate-mid);
}
.ax-section__title {
  margin: 0.28em 0 0.5em;
  max-width: 20em;
}
.ax-lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
  color: var(--ax-slate);
  max-width: 34em;
}
.ax-prose {
  font-size: 17px;
  line-height: 1.75;
  color: var(--ax-text);
  max-width: 38em;
}
.ax-prose p { margin-bottom: 1.2em; }
.ax-prose p:last-child { margin-bottom: 0; }

.ax-rule {
  height: 1px;
  border: 0;
  background: var(--ax-line-soft);
  margin: clamp(28px, 4vw, 56px) 0;
}

/* ===== 数字 / 标记 ===== */
.ax-num {
  font-family: var(--ax-font-mono);
  font-size: 0.94em;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}
.ax-code {
  font-family: var(--ax-font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
  background: rgba(15, 58, 49, 0.07);
  color: var(--ax-ink);
  padding: 2px 7px;
  border-radius: 6px;
}
.ax-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid transparent;
  background: var(--ax-white);
  color: var(--ax-slate);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background-color 160ms var(--ax-ease), color 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}
.ax-tag--outline { border-color: var(--ax-line); }
.ax-tag--outline:hover { border-color: var(--ax-ink); color: var(--ax-ink); background: rgba(15, 58, 49, 0.05); }
.ax-tag--amber {
  background: var(--ax-amber);
  border-color: var(--ax-amber);
  color: var(--ax-text);
  font-weight: 700;
}
.ax-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--ax-radius-pill);
  border: 1px dashed var(--ax-amber);
  background: rgba(224, 138, 44, 0.14);
  color: var(--ax-ink);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.ax-card {
  background: var(--ax-white);
  border-radius: var(--ax-radius-lg);
  padding: clamp(20px, 3vw, 32px);
  box-shadow: var(--ax-shadow-soft);
}
.ax-card--flat {
  background: transparent;
  border: 1px solid var(--ax-line-soft);
  border-radius: var(--ax-radius-md);
  box-shadow: none;
}
.ax-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ===== 按钮 ===== */
.ax-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 17px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid var(--ax-ink);
  background: transparent;
  color: var(--ax-ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 160ms var(--ax-ease), color 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}
.ax-btn--ghost:hover { background: var(--ax-ink); color: var(--ax-paper); }
.ax-btn--solid { background: var(--ax-ink); color: var(--ax-paper); }
.ax-btn--solid:hover { background: var(--ax-ink-deep); border-color: var(--ax-ink-deep); }
.ax-btn--amber {
  background: var(--ax-amber);
  border-color: var(--ax-amber);
  color: var(--ax-text);
  font-weight: 700;
}
.ax-btn--amber:hover { background: #cf7a1d; border-color: #cf7a1d; }

.ax-copy {
  font-family: var(--ax-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 3px 10px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid var(--ax-line);
  color: var(--ax-slate);
  cursor: pointer;
  transition: color 160ms var(--ax-ease), border-color 160ms var(--ax-ease), background-color 160ms var(--ax-ease);
}
.ax-copy:hover { color: var(--ax-ink); border-color: var(--ax-ink); background: rgba(15, 58, 49, 0.06); }

.ax-totop {
  font-family: var(--ax-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 6px 15px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid var(--ax-line);
  color: var(--ax-slate);
  cursor: pointer;
  transition: color 160ms var(--ax-ease), border-color 160ms var(--ax-ease), background-color 160ms var(--ax-ease);
}
.ax-totop:hover { color: var(--ax-paper); background: var(--ax-ink); border-color: var(--ax-ink); }

/* ===== 头部 ===== */
.ax-skip {
  position: absolute;
  left: 50%;
  top: 10px;
  z-index: 220;
  transform: translate(-50%, -180%);
  padding: 10px 20px;
  border-radius: var(--ax-radius-pill);
  background: var(--ax-ink);
  color: var(--ax-paper);
  font-size: 14px;
  text-decoration: none;
  transition: transform 160ms var(--ax-ease);
}
.ax-skip:focus { transform: translate(-50%, 0); }

.ax-rail { display: none; }

.ax-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 243, 236, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--ax-line);
}
.ax-header::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--ax-ink) 0 22%, var(--ax-ink-mid) 22% 26%, transparent 26%);
}

.ax-header__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas: "brand nav utility";
  align-items: center;
  gap: clamp(14px, 2vw, 34px);
  width: 100%;
  max-width: var(--ax-shell);
  margin-inline: auto;
  padding: 12px var(--ax-gutter);
  min-height: 78px;
}

.ax-brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.ax-brand__mark {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: var(--ax-ink);
  color: var(--ax-paper);
  font-family: var(--ax-font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
}
.ax-brand__text { display: block; }
.ax-brand__name {
  display: block;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--ax-text);
}
.ax-brand__line {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ax-slate);
  line-height: 1.4;
}

.ax-nav { grid-area: nav; }
.ax-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.ax-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 13px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid transparent;
  color: var(--ax-slate);
  font-size: 14.5px;
  text-decoration: none;
  transition: color 160ms var(--ax-ease), background-color 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}
.ax-nav__link::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 4px;
  height: 1px;
  border-bottom: 1px dashed rgba(15, 58, 49, 0.5);
  opacity: 0;
  transition: opacity 140ms var(--ax-ease);
}
.ax-nav__link:hover { color: var(--ax-ink); background: rgba(15, 58, 49, 0.05); border-color: rgba(15, 58, 49, 0.18); }
.ax-nav__link:hover::after { opacity: 1; border-bottom-style: solid; }
.ax-nav__link[aria-current="page"] {
  background: var(--ax-ink);
  border-color: var(--ax-ink);
  color: var(--ax-paper);
}
.ax-nav__link[aria-current="page"]::after { opacity: 0; }

.ax-header__utility {
  grid-area: utility;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.ax-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--ax-radius-pill);
  border: 1px solid var(--ax-line);
  background: var(--ax-white);
  color: var(--ax-slate);
  font-size: 12.5px;
  text-decoration: none;
  transition: border-color 160ms var(--ax-ease), color 160ms var(--ax-ease);
}
.ax-status:hover { border-color: var(--ax-ink); color: var(--ax-ink); }
.ax-status__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ax-ink-mid);
  box-shadow: 0 0 0 3px rgba(47, 122, 107, 0.16);
}
.ax-status__label { letter-spacing: 0.04em; }
.ax-status__ver {
  font-family: var(--ax-font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ax-ink);
}
.ax-status__stamp {
  padding: 3px 9px;
  border-radius: var(--ax-radius-pill);
  background: var(--ax-amber);
  color: var(--ax-text);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ax-nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 44px;
  border-radius: 14px;
  border: 1px solid var(--ax-line);
  background: var(--ax-white);
  cursor: pointer;
}
.ax-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}
.ax-nav-toggle__bar {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--ax-ink);
  transition: transform 160ms var(--ax-ease), opacity 140ms linear;
}
.ax-nav-toggle__bar--a { top: 1px; }
.ax-nav-toggle__bar--b { bottom: 1px; }
.ax-nav-toggle[aria-expanded="true"] .ax-nav-toggle__bar--a { transform: translateY(4px) rotate(45deg); }
.ax-nav-toggle[aria-expanded="true"] .ax-nav-toggle__bar--b { transform: translateY(-4px) rotate(-45deg); }
.ax-nav-toggle__label {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.ax-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--ax-amber);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ===== 页脚 ===== */
.ax-footer {
  margin-top: clamp(56px, 8vw, 120px);
  border-top: 1px solid var(--ax-line);
  background-color: var(--ax-paper);
  background-image:
    linear-gradient(to right, rgba(15, 58, 49, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 58, 49, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--ax-slate);
  font-size: 15px;
}
.ax-footer__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.4fr;
  gap: clamp(24px, 4vw, 64px);
  padding-block: clamp(40px, 6vw, 76px) clamp(24px, 3vw, 40px);
}
.ax-footer__col { min-width: 0; }
.ax-footer__brand {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ax-text);
}
.ax-footer__tag {
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ax-slate-mid);
}
.ax-footer__legal { margin-top: 18px; }
.ax-icp {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--ax-radius-pill);
  border: 1px dashed var(--ax-line);
  font-family: var(--ax-font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ax-slate);
}
.ax-footer__copy {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--ax-slate-mid);
}
.ax-footer__title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  color: var(--ax-slate-mid);
  text-transform: uppercase;
  font-family: var(--ax-font-mono);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ax-line-soft);
  margin-bottom: 6px;
}
.ax-footer__list { display: block; }
.ax-footer__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(62, 90, 107, 0.16);
}
.ax-footer__item:last-child { border-bottom: 0; }
.ax-footer__link {
  color: var(--ax-slate);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}
.ax-footer__link:hover { color: var(--ax-ink); border-bottom-color: var(--ax-ink); }
.ax-footer__key {
  flex: 0 0 auto;
  min-width: 4.6em;
  font-size: 12.5px;
  color: var(--ax-slate-mid);
}
.ax-footer__val {
  color: var(--ax-text);
  font-size: 14px;
  word-break: break-all;
}
.ax-footer__note {
  margin: 16px 0 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ax-slate-mid);
  max-width: 40ch;
}
.ax-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 18px 30px;
  border-top: 1px dashed var(--ax-line-soft);
}
.ax-footer__meta {
  font-size: 13px;
  color: var(--ax-slate-mid);
  max-width: 72ch;
}

/* ===== 通用内容组件 ===== */
.ax-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--ax-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--ax-slate-mid);
}
.ax-crumbs__link {
  color: var(--ax-slate);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 160ms var(--ax-ease), border-color 160ms var(--ax-ease);
}
.ax-crumbs__link:hover { color: var(--ax-ink); border-bottom-color: var(--ax-ink); }
.ax-crumbs__sep { color: var(--ax-slate-soft); }

.ax-index { position: sticky; top: 118px; }
.ax-index__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--ax-line);
}
.ax-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  color: var(--ax-slate-mid);
  text-decoration: none;
  transition: color 160ms var(--ax-ease), border-color 160ms var(--ax-ease), background-color 160ms var(--ax-ease);
}
.ax-index__link:hover { color: var(--ax-ink); background: rgba(15, 58, 49, 0.045); }
.ax-index__link[aria-current="true"] {
  color: var(--ax-ink);
  font-weight: 700;
  border-left-color: var(--ax-amber);
}
.ax-index__num {
  font-family: var(--ax-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ax-slate-mid);
}

.ax-media { margin: 0; }
.ax-media__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--ax-radius-lg);
  border: 1px solid var(--ax-line-soft);
  background-color: var(--ax-white);
  background-image:
    linear-gradient(to right, rgba(15, 58, 49, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 58, 49, 0.05) 1px, transparent 1px);
  background-size: 16px 16px;
}
.ax-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ax-media__cap {
  margin-top: 10px;
  font-size: 13px;
  color: var(--ax-slate-mid);
}
.ax-media--wide .ax-media__frame { aspect-ratio: 21 / 9; }
.ax-media--tall .ax-media__frame { aspect-ratio: 4 / 5; }

.ax-fold {
  border-top: 1px solid var(--ax-line-soft);
  padding: 2px 0;
}
.ax-fold:last-child { border-bottom: 1px solid var(--ax-line-soft); }
.ax-fold__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
  list-style: none;
  font-size: 17px;
  font-weight: 700;
  color: var(--ax-text);
}
.ax-fold__summary::-webkit-details-marker { display: none; }
.ax-fold__summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--ax-font-mono);
  color: var(--ax-ink-mid);
  transition: transform 200ms var(--ax-ease);
}
.ax-fold[open] .ax-fold__summary::after { content: "－"; }
.ax-fold__body {
  padding: 0 0 18px;
  color: var(--ax-slate);
  max-width: 42em;
}

.ax-flow {
  display: flex;
  flex-wrap: wrap;
  border-top: 1px solid var(--ax-line);
  border-bottom: 1px solid var(--ax-line);
}
.ax-flow__step {
  flex: 1 1 200px;
  padding: 20px 22px;
  border-right: 1px dashed var(--ax-line-soft);
}
.ax-flow__step:last-child { border-right: 0; }

.ax-toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  z-index: 240;
  transform: translate(-50%, 14px);
  padding: 11px 20px;
  border-radius: var(--ax-radius-pill);
  background: var(--ax-ink);
  color: var(--ax-paper);
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ax-ease), transform 200ms var(--ax-ease);
}
.ax-toast.is-on { opacity: 1; transform: translate(-50%, 0); }

/* ===== 宽屏：蓝图竖轨 ===== */
@media (min-width: 1180px) {
  :root { --ax-rail-w: 34px; }
  .ax-rail {
    display: block;
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--ax-rail-w);
    z-index: 60;
    pointer-events: none;
    border-right: 1px solid var(--ax-line);
    background-color: rgba(246, 243, 236, 0.72);
  }
  .ax-rail__ticks {
    position: absolute;
    inset: 96px 0 120px 0;
    background-image: repeating-linear-gradient(
      to bottom,
      var(--ax-line-soft) 0 1px,
      transparent 1px 32px
    );
    background-size: 12px 100%;
    background-position: right top;
    background-repeat: no-repeat;
  }
  .ax-rail__label {
    position: absolute;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    writing-mode: vertical-rl;
    font-family: var(--ax-font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--ax-slate-mid);
  }
}

/* ===== 平板 ===== */
@media (max-width: 1200px) {
  .ax-nav__link { padding: 7px 10px; font-size: 14px; }
  .ax-status__label { display: none; }
}

/* ===== 移动端 ===== */
@media (max-width: 900px) {
  html { scroll-padding-top: 150px; }

  .ax-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "nav nav"
      "utility utility";
    gap: 0;
    padding: 12px var(--ax-gutter) 0;
    min-height: 0;
  }
  .ax-nav-toggle { display: inline-flex; }

  .ax-nav {
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transition: max-height 200ms var(--ax-ease), visibility 200ms linear;
  }
  .ax-nav[data-open],
  .ax-header[data-open] .ax-nav {
    visibility: visible;
    max-height: 520px;
  }
  .ax-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px 0 12px;
    border-top: 1px dashed var(--ax-line-soft);
  }
  .ax-nav__link {
    display: block;
    padding: 12px 14px;
    border-radius: var(--ax-radius-sm);
    font-size: 16px;
  }
  .ax-nav__link::after { left: 14px; right: auto; width: 22px; bottom: 8px; }

  .ax-header__utility {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 10px 0 12px;
    border-top: 1px dashed var(--ax-line-soft);
    scrollbar-width: thin;
  }
  .ax-header__utility .ax-btn { flex: 0 0 auto; }

  .ax-grid { grid-template-columns: minmax(0, 1fr); }
  [class*="ax-span-"] { grid-column: 1 / -1; }

  .ax-index { position: static; }
  .ax-index__list { flex-direction: row; flex-wrap: wrap; border-left: 0; }
  .ax-index__link { border-left: 0; border-bottom: 2px solid transparent; }
  .ax-index__link[aria-current="true"] { border-left: 0; border-bottom-color: var(--ax-amber); }

  .ax-flow__step { flex: 1 1 100%; border-right: 0; border-bottom: 1px dashed var(--ax-line-soft); }
  .ax-flow__step:last-child { border-bottom: 0; }
}

@media (max-width: 1024px) {
  .ax-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .ax-footer__grid { grid-template-columns: 1fr; }
  .ax-footer__bottom { flex-direction: column; align-items: flex-start; }
  .ax-media__frame { border-radius: var(--ax-radius-md); }
}

/* ===== 动效降级 ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .ax-skip { transition: none; }
}