/* ==========================================================================
   东升国际 · 共享站点样式 /assets/site.css
   晨雾蓝铺底 / 东升橙点睛 / 等宽编号贯穿 / 极细边界
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
dl, dd, dt,
ul, ol { margin: 0; }

ul[class],
ol[class] { list-style: none; padding: 0; }

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --paper: #FFFFFF;
  --mist-50: #F5F8F9;
  --mist-100: #E7EEF0;
  --mist-200: #CFDCDF;
  --mist-500: #6C8A93;
  --ink-900: #0E1D23;
  --ink-700: #22383F;
  --orange: #E2571E;
  --orange-700: #A83C10;
  --bamboo: #4C7A5F;
  --bamboo-50: #E6EFE8;
  --warn: #8A5A22;

  --dark-surface: #0E1D23;
  --dark-text: #E7EEF0;
  --dark-muted: #93AEB6;
  --dark-line: rgba(207, 220, 223, .16);

  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --shell-pad: clamp(24px, 6vw, 96px);
  --shell-max: 1440px;
  --radius: 2px;
  --dur: 240ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow-soft: 0 1px 0 rgba(14, 29, 35, .06);
  --shadow-panel: 0 18px 40px rgba(14, 29, 35, .10);
}

/* ---------- 3. 中文排版底座 ---------- */
html { -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-900);
  background-color: var(--mist-50);
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.15;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

h1 { font-size: clamp(40px, 6.2vw, 96px); }
h2 { font-size: clamp(28px, 3.2vw, 40px); font-weight: 600; letter-spacing: -.01em; }
h3 { font-size: clamp(20px, 2vw, 24px); font-weight: 600; letter-spacing: 0; line-height: 1.3; }
h4 { font-size: 17px; font-weight: 600; letter-spacing: 0; line-height: 1.4; }

p { max-width: 74ch; }

a {
  color: var(--orange-700);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: rgba(168, 60, 16, .32);
  transition: color var(--dur) var(--ease), text-decoration-color var(--dur) var(--ease);
}

a:hover {
  color: var(--orange);
  text-decoration-color: currentColor;
}

.site-nav__link,
.brand,
.btn,
.skip-link,
.footer-brand,
.footer-col__link,
.footer-base__link,
.breadcrumb a { text-decoration: none; }

::selection {
  background: rgba(226, 87, 30, .18);
  color: var(--ink-900);
}

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

/* ---------- 4. 布局底座 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.page-body {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: var(--shell-pad);
  padding-block: clamp(36px, 5vw, 72px) clamp(64px, 8vw, 112px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
}

.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; }

.section { padding-block: clamp(40px, 6vw, 88px); }
.section--tint { background-color: var(--mist-100); }
.section--paper { background-color: var(--paper); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(24px, 3vw, 40px);
}

.divider {
  height: 1px;
  border: 0;
  margin: 0;
  background-color: var(--mist-200);
}

/* ---------- 5. 索引与等宽 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist-500);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  flex: none;
  background-color: var(--orange);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(20px, 3vw, 32px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist-500);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--mist-200);
}

.breadcrumb a { color: var(--mist-500); }
.breadcrumb a:hover { color: var(--orange-700); }
.breadcrumb [aria-current="page"] { color: var(--ink-900); }

/* ---------- 7. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  inset-block-start: 0;
  inset-inline-start: 16px;
  z-index: 200;
  padding: 12px 22px;
  background-color: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  border-radius: 0 0 var(--radius) var(--radius);
  transform: translateY(-130%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 8. 头部 ---------- */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 80;
  background-color: var(--paper);
  border-bottom: 1px solid var(--mist-200);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header[data-scrolled="true"] {
  box-shadow: 0 8px 24px rgba(14, 29, 35, .07);
}

/* 8.1 上层信息条 */
.header-utility {
  background-color: var(--ink-900);
  color: var(--mist-200);
}

.header-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 36px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
}

.header-utility__brand {
  display: inline-flex;
  align-items: center;
  max-width: none;
  color: #B9CBD0;
  white-space: nowrap;
}

.header-utility__brand::before {
  content: "";
  width: 5px;
  height: 5px;
  margin-inline-end: 10px;
  flex: none;
  border-radius: 50%;
  background-color: var(--orange);
}

.header-utility__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.header-utility__link {
  color: var(--mist-200);
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-utility__link:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.header-utility__sep {
  width: 1px;
  height: 11px;
  flex: none;
  background-color: rgba(207, 220, 223, .3);
}

.header-utility__icp {
  color: #7E9AA3;
  white-space: nowrap;
}

/* 8.2 主导航行 */
.header-main {
  position: relative;
  background-color: var(--paper);
}

.header-main__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 3vw, 40px);
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  flex: none;
  color: var(--ink-900);
}

.brand__mark {
  width: 16px;
  height: 16px;
  flex: none;
  background-color: var(--orange);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand__mark { transform: rotate(135deg); }

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.brand__tag {
  display: block;
  margin-block-start: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--mist-500);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 32px);
  min-width: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.8vw, 28px);
  counter-reset: navidx;
}

.site-nav__list > li { counter-increment: navidx; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 24px 0 22px;
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: .01em;
  color: var(--ink-700);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.site-nav__link::before {
  content: "0" counter(navidx);
  margin-inline-end: 7px;
  vertical-align: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--mist-500);
  transition: color var(--dur) var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  inset-block-end: 16px;
  height: 1.5px;
  background-color: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__link:hover { color: var(--ink-900); }
.site-nav__link:hover::before { color: var(--orange); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link:focus-visible::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] {
  color: var(--ink-900);
  font-weight: 600;
}

.site-nav__link[aria-current="page"]::before { color: var(--orange); }

.site-nav__link[aria-current="page"]::after {
  height: 2px;
  inset-block-end: 15px;
  transform: scaleX(1);
}

.site-nav__cta {
  margin-inline-start: 4px;
  white-space: nowrap;
}

/* 8.3 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--mist-200);
  border-radius: var(--radius);
  color: var(--ink-900);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--ink-900);
  background-color: var(--mist-50);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(2.75px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2) {
  transform: translateY(-2.75px) rotate(-45deg);
}

.site-header[data-open="true"] .nav-toggle {
  border-color: var(--orange);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1;
  text-align: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn--primary {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
}

.btn--primary:hover {
  background-color: var(--orange-700);
  border-color: var(--orange-700);
  color: var(--paper);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--mist-200);
  color: var(--ink-900);
}

.btn--ghost:hover {
  background-color: var(--mist-50);
  border-color: var(--ink-900);
}

.btn--dark {
  background-color: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper);
}

.btn--dark:hover {
  background-color: var(--ink-700);
  border-color: var(--ink-700);
  color: var(--paper);
}

/* ---------- 10. 标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.6;
  border: 1px solid var(--mist-200);
  border-radius: 999px;
  color: var(--ink-700);
  background-color: var(--paper);
}

.chip--orange {
  border-color: rgba(226, 87, 30, .45);
  color: var(--orange-700);
  background-color: rgba(226, 87, 30, .07);
}

.chip--bamboo {
  border-color: rgba(76, 122, 95, .45);
  color: var(--bamboo);
  background-color: var(--bamboo-50);
}

.chip--warn {
  border-color: rgba(138, 90, 34, .4);
  color: var(--warn);
  background-color: rgba(138, 90, 34, .06);
}

/* ---------- 11. 图片容器底座 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--mist-100);
  border: 1px solid var(--mist-200);
  border-radius: var(--radius);
}

.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 6; }
.media-frame--strip { aspect-ratio: 21 / 7; }
.media-frame--landscape { aspect-ratio: 4 / 3; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--placeholder {
  background-image: repeating-linear-gradient(
    135deg,
    var(--mist-100) 0 12px,
    var(--mist-50) 12px 24px
  );
}

.media-frame__caption {
  margin-block-start: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist-500);
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--dark-surface);
  color: var(--dark-text);
  padding-block: clamp(48px, 6vw, 84px) 28px;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: clamp(80px, 12vw, 160px);
  height: 2px;
  background-color: var(--orange);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 4vw, 64px);
  padding-block-end: clamp(32px, 4vw, 56px);
  border-bottom: 1px solid var(--dark-line);
}

.footer-intro { max-width: 36ch; }

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
}

.footer-brand__mark {
  width: 14px;
  height: 14px;
  flex: none;
  background-color: var(--orange);
  transform: rotate(45deg);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--paper);
}

.footer-intro__line {
  margin-block-start: 16px;
  max-width: none;
  font-size: 14px;
  line-height: 1.8;
  color: var(--dark-muted);
}

.footer-intro__note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-block-start: 14px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--dark-muted);
}

.footer-intro__note::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: none;
  border-radius: 50%;
  background-color: var(--bamboo);
}

.footer-col__title {
  margin-block-end: 16px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
}

.footer-col__list {
  display: grid;
  gap: 10px;
}

.footer-col__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.6;
  color: #C4D6DB;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-col__link:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.footer-base {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px 40px;
  padding-block-start: 26px;
}

.footer-base__info { min-width: 0; }

.footer-base__legal,
.footer-base__contact {
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.9;
  color: var(--dark-muted);
  word-break: break-word;
}

.footer-base__aside {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 16px 28px;
}

.footer-base__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-base__link {
  font-size: 12px;
  color: #C4D6DB;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-base__link:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.footer-base__copy {
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--dark-muted);
}

/* ---------- 13. 滚动显现 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.js-ready [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1024px) {
  html { scroll-padding-top: 76px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    inset-inline: 0;
    inset-block-start: 100%;
    display: block;
    padding: 6px var(--shell-pad) 24px;
    background-color: var(--paper);
    border-bottom: 1px solid var(--mist-200);
    box-shadow: var(--shadow-panel);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 280ms var(--ease),
                opacity var(--dur) var(--ease),
                visibility 0s linear 280ms;
  }

  .site-header[data-open="true"] .site-nav {
    max-height: min(78vh, 560px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transition: max-height 320ms var(--ease),
                opacity var(--dur) var(--ease),
                visibility 0s;
  }

  .site-nav__list { display: block; }

  .site-nav__list > li + li { border-top: 1px solid var(--mist-100); }

  .site-nav__link {
    display: block;
    padding: 16px 0 16px 14px;
    font-size: 16px;
    color: var(--ink-900);
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    color: var(--orange-700);
    box-shadow: inset 2px 0 0 var(--orange);
  }

  .site-nav__link[aria-current="page"]::before { color: var(--orange-700); }

  .site-nav__cta {
    width: 100%;
    margin-block-start: 18px;
    margin-inline-start: 0;
  }

  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-intro { grid-column: 1 / -1; max-width: none; }

  .grid-12 .col-4,
  .grid-12 .col-5,
  .grid-12 .col-6,
  .grid-12 .col-7,
  .grid-12 .col-8 { grid-column: span 12; }
}

@media (max-width: 780px) {
  .footer-base {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .footer-base__aside {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 24px; }
}

@media (max-width: 640px) {
  .header-utility__inner {
    min-height: 32px;
    gap: 12px;
    font-size: 10px;
    letter-spacing: .06em;
  }

  .header-utility__brand { display: none; }

  .header-utility__meta {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .header-utility__icp {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .header-main__inner { min-height: 64px; }

  .brand { gap: 14px; }
  .brand__name { font-size: 17px; }
  .brand__tag { font-size: 9px; letter-spacing: .14em; }

  .footer-base__legal,
  .footer-base__contact { font-size: 10px; letter-spacing: .04em; }
}

@media (max-width: 420px) {
  .brand__tag { display: none; }
  .nav-toggle__label { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- 15. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .skip-link { transition: none; }
  .brand:hover .brand__mark { transform: rotate(45deg); }
  .js-ready [data-reveal],
  .js-ready [data-reveal][data-revealed="true"] {
    opacity: 1 !important;
    transform: none !important;
  }
}