/* ============================================================
   365平台 · 共享样式 /assets/site.css
   图纸式界面：细线、刻度、编号、纸白浮岛、标题栏页脚
   ============================================================ */

:root {
  --ink: #0A1A2F;
  --teal: #0E2E33;
  --wine: #4A1E2B;
  --indigo: #262A5C;
  --amber: #FF9F1C;
  --paper: #F4F1EA;
  --steel: #A9B4C2;
  --mist: #DCE3EA;
  --green: #3DDC97;
  --slate: #6F7C8C;

  --line-dark: rgba(169, 180, 194, 0.26);
  --line-darker: rgba(169, 180, 194, 0.16);
  --line-light: rgba(10, 26, 47, 0.16);

  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, "Courier New", monospace;

  --shell: 1180px;
  --gutter: clamp(18px, 5vw, 56px);
  --radius: 3px;
  --header-space: clamp(84px, 10vw, 106px);
  --shadow-float: 0 24px 48px -32px rgba(0, 0, 0, 0.85);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 124px;
}

body {
  margin: 0;
  padding-top: var(--header-space);
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.004em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
::selection { background: var(--amber); color: var(--ink); }

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}
.site-header :focus-visible,
.section--paper :focus-visible,
.frame--paper :focus-visible,
.footer-grid :focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}
.site-header :focus-visible { outline-color: var(--indigo); }
.section--paper :focus-visible,
.frame--paper :focus-visible { outline-color: var(--indigo); }

/* ---------- 跳过导航 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 300;
  transform: translate(-50%, -180%);
  padding: 11px 20px;
  background: var(--amber);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  border-radius: 2px;
  transition: transform 0.18s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 基础工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 0.82em;
  letter-spacing: 0.08em;
}

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

.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}
.section--ink { background: var(--ink); color: var(--paper); }
.section--paper { background: var(--paper); color: var(--ink); }
.section--teal { background: var(--teal); color: var(--paper); }
.section--wine { background: var(--wine); color: var(--paper); }
.section--indigo { background: var(--indigo); color: var(--paper); }

.section--paper .coord,
.section--paper .figure__cap { color: var(--slate); }
.section--paper .eyebrow { color: var(--wine); }
.section--paper .rule { color: var(--ink); }

/* ---------- 文字组件 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.04em;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.6vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.coord {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.rot-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  writing-mode: vertical-rl;
  color: var(--steel);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(20px, 3vw, 36px);
  background: currentColor;
  opacity: 0.22;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn--primary {
  background: var(--amber);
  color: var(--ink);
  border-color: var(--amber);
}
.btn--primary:hover { background: #ffb349; border-color: #ffb349; }
.btn--ink {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn--ink:hover { background: var(--indigo); border-color: var(--indigo); }
.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(244, 241, 234, 0.42);
}
.btn--ghost:hover { border-color: var(--paper); }
.btn--sm { padding: 9px 14px; font-size: 13px; }

/* ---------- 头部：悬浮纸白胶囊 ---------- */
.site-header {
  position: fixed;
  top: 16px;
  left: 0;
  right: 0;
  z-index: 100;
  padding-inline: clamp(12px, 3vw, 28px);
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 9px clamp(10px, 1.4vw, 16px) 11px clamp(12px, 1.6vw, 20px);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(10, 26, 47, 0.2);
  border-radius: 999px;
  box-shadow: var(--shadow-float);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  padding: 4px 6px;
  border-radius: 999px;
}
.brand__mark {
  position: relative;
  width: 26px;
  height: 26px;
  flex: 0 0 auto;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
}
.brand__mark::before {
  content: "";
  position: absolute;
  left: 3px;
  right: 3px;
  top: 50%;
  height: 1.5px;
  background: var(--ink);
  transform: translateY(-50%);
}
.brand__mark::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 9px;
  height: 9px;
  background: var(--amber);
  border: 1.5px solid var(--ink);
  border-radius: 50%;
}
.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.05;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--slate);
}

/* 导航 */
.nav {
  display: flex;
  margin-left: auto;
}
.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav__item { display: block; }
.nav__link {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 12px;
  border-radius: 999px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease;
}
.nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--slate);
  transition: color 0.18s ease;
}
.nav__label { display: inline-block; }
.nav__link:hover { background: rgba(10, 26, 47, 0.07); }
.nav__link[aria-current="page"] {
  background: var(--ink);
  color: var(--paper);
}
.nav__link[aria-current="page"] .nav__num { color: var(--amber); }

/* 头部右侧动作区 */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* 复制邮箱 */
.copy-mail {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(10, 26, 47, 0.28);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.copy-mail:hover {
  border-color: var(--ink);
  background: rgba(10, 26, 47, 0.05);
}
.copy-mail__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(61, 220, 151, 0.18);
}
.copy-mail__text { white-space: nowrap; }
.copy-mail.is-copied {
  border-color: var(--green);
  background: rgba(61, 220, 151, 0.14);
  color: var(--ink);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1;
  cursor: pointer;
}
.nav-toggle__label { white-space: nowrap; }
.nav-toggle__glyph {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle__glyph::before,
.nav-toggle__glyph::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease;
}
.nav-toggle__glyph::before { top: 0; }
.nav-toggle__glyph::after { bottom: 0; }
.site-header[data-open="true"] .nav-toggle__glyph::before { transform: translateY(4px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__glyph::after { transform: translateY(-4px) rotate(-45deg); }

/* 校准线进度 */
.progress-rail {
  position: absolute;
  left: clamp(22px, 3vw, 38px);
  right: clamp(22px, 3vw, 38px);
  bottom: 4px;
  height: 2px;
  overflow: hidden;
  border-radius: 2px;
  background-color: rgba(10, 26, 47, 0.08);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(10, 26, 47, 0.22) 0 1px,
    transparent 1px 14px
  );
}
.progress-rail__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--amber);
  border-radius: 2px;
}

/* ---------- 页脚：工程图标题栏 ---------- */
.site-footer {
  position: relative;
  background: var(--teal);
  color: var(--paper);
  border-top: 1px solid var(--line-dark);
}
.site-footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 84px) var(--gutter) 0;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(20px, 4vw, 60px);
  align-items: end;
  padding-bottom: clamp(24px, 4vw, 40px);
}
.footer-brand { display: flex; flex-direction: column; gap: 10px; }
.footer-brand__word {
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 6vw, 4.4rem);
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.04em;
}
.footer-brand__coord {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: rgba(169, 180, 194, 0.7);
}
.footer-brand__summary {
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.45fr);
  gap: 1px;
  background: var(--line-darker);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}
.footer-col {
  padding: clamp(20px, 2.6vw, 32px) clamp(14px, 1.8vw, 24px);
  background: var(--teal);
}
.footer-col--contact { align-content: start; }
.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}
.footer-col__num { color: var(--amber); }
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-col__item { line-height: 1.4; }
.footer-col__link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-size: 15px;
  color: var(--paper);
  transition: color 0.18s ease, border-color 0.18s ease;
}
.footer-col__link:hover { color: var(--amber); border-color: var(--amber); }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact__row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  line-height: 1.65;
  color: var(--steel);
}
.footer-contact__label {
  flex: 0 0 auto;
  min-width: 34px;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(169, 180, 194, 0.7);
}
.footer-contact__value {
  color: var(--paper);
  word-break: break-word;
}
.footer-note {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--line-darker);
  font-size: 12.5px;
  line-height: 1.75;
  color: rgba(169, 180, 194, 0.8);
}

.copy-mail--wide {
  align-self: flex-start;
  border-color: rgba(169, 180, 194, 0.45);
  color: var(--paper);
  font-size: 11.5px;
  letter-spacing: 0.05em;
}
.copy-mail--wide:hover {
  border-color: var(--amber);
  color: var(--amber);
  background: rgba(255, 159, 28, 0.08);
}
.copy-mail--wide.is-copied {
  border-color: var(--green);
  background: rgba(61, 220, 151, 0.12);
  color: var(--green);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  padding: 22px 0 40px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(169, 180, 194, 0.75);
}
.footer-base__icp { color: rgba(169, 180, 194, 0.9); }
.footer-base__meta { color: rgba(169, 180, 194, 0.75); }
.footer-base__note {
  flex-basis: 100%;
  max-width: 74ch;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.01em;
  line-height: 1.7;
  color: rgba(169, 180, 194, 0.7);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); }
.grid--poster { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.stack > * + * { margin-top: clamp(16px, 2.2vw, 28px); }
.stack--tight > * + * { margin-top: 10px; }

/* ---------- 细线档案框 ---------- */
.frame {
  position: relative;
  padding: clamp(18px, 2.5vw, 30px);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: transparent;
}
.frame--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line-light);
}
.frame__label {
  position: absolute;
  top: -9px;
  left: 14px;
  padding: 0 8px;
  background: var(--ink);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  line-height: 18px;
  text-transform: uppercase;
}
.frame--paper .frame__label { background: var(--paper); color: var(--slate); }
.section--teal .frame__label,
.section--wine .frame__label,
.section--indigo .frame__label { background: inherit; }

/* ---------- 图片容器基础 ---------- */
.figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}
.figure__media {
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-dark);
  border-radius: 2px;
  background-color: rgba(169, 180, 194, 0.08);
  background-image:
    linear-gradient(rgba(169, 180, 194, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 180, 194, 0.16) 1px, transparent 1px);
  background-size: 32px 32px;
}
.figure--wide .figure__media { aspect-ratio: 21 / 9; }
.figure--tall .figure__media { aspect-ratio: 3 / 4; }
.figure--square .figure__media { aspect-ratio: 1 / 1; }
.figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure__cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.6;
  color: var(--steel);
}
.section--paper .figure__media { border-color: var(--line-light); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--steel);
}
.tag--amber { color: var(--amber); }
.tag--wine { color: #E4A9B8; }
.tag--steel { color: var(--steel); }

/* ---------- 清单 ---------- */
.data-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line-dark);
}
.data-list__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-darker);
}
.data-list__k { font-size: 15px; line-height: 1.6; }
.data-list__v {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}
.section--paper .data-list { border-top-color: var(--line-light); }
.section--paper .data-list__row { border-bottom-color: var(--line-light); }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-block: 4px clamp(16px, 2.4vw, 28px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__link { color: var(--steel); transition: color 0.18s ease; }
.breadcrumb__link:hover { color: var(--amber); }
.breadcrumb__sep { color: rgba(169, 180, 194, 0.5); }
.breadcrumb__current { color: var(--paper); }

/* ---------- 长文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17.5px;
  line-height: 1.8;
}
.prose > p { margin-bottom: 1.2em; }
.prose h2 {
  margin: 1.6em 0 0.6em;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.prose h3 {
  margin: 1.4em 0 0.5em;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
}
.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.3em;
  list-style: disc;
}
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.5em; }
.prose a {
  border-bottom: 1px solid var(--amber);
  transition: color 0.18s ease;
}
.prose a:hover { color: var(--amber); }
.prose strong { font-weight: 700; }
.prose blockquote {
  margin: 0 0 1.2em;
  padding-left: 18px;
  border-left: 2px solid var(--amber);
  color: var(--steel);
}

/* ---------- 平板 ---------- */
@media (max-width: 1080px) {
  .site-header__inner { gap: 10px; padding: 8px 10px 10px 14px; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    z-index: 5;
    display: none;
    flex-direction: column;
    margin-left: 0;
    padding: 8px;
    background: var(--paper);
    color: var(--ink);
    border: 1px solid rgba(10, 26, 47, 0.2);
    border-radius: 20px;
    box-shadow: var(--shadow-float);
  }
  .site-header[data-open="true"] .nav { display: flex; }

  .nav__list { flex-direction: column; width: 100%; gap: 0; }
  .nav__item + .nav__item { border-top: 1px solid rgba(10, 26, 47, 0.1); }
  .nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 12px;
    border-radius: 12px;
    font-size: 16px;
  }
  .nav__num { color: var(--slate); }

  .nav-toggle { display: inline-flex; }
  .site-header__actions { margin-left: auto; }

  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--split,
  .grid--poster { grid-template-columns: minmax(0, 1fr); }
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 手机 ---------- */
@media (max-width: 860px) {
  .grid--2 { grid-template-columns: minmax(0, 1fr); }
  .footer-top { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .footer-brand__summary { max-width: none; }
}

@media (max-width: 720px) {
  .site-header__actions .copy-mail { display: none; }
  .site-header__actions .btn--sm { font-size: 12px; padding: 9px 12px; }
  .footer-base { padding-bottom: 32px; }
}

@media (max-width: 600px) {
  body { font-size: 16.5px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-col { padding: 18px clamp(12px, 4vw, 20px); }
  .brand__sub { display: none; }
  .nav-toggle__label { display: none; }
  .nav-toggle { padding: 10px; }
  .data-list__row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
}

@media (max-width: 420px) {
  .brand__name { font-size: 15px; }
  .brand__mark { width: 22px; height: 22px; }
  .site-header__inner { gap: 6px; }
  .site-header__actions .btn--sm { font-size: 11px; padding: 8px 10px; }
}

/* ---------- 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;
    scroll-behavior: auto !important;
  }
}