:root {
  --ink: #0A1B2A;
  --ink-deep: #071320;
  --ink-2: #102A43;
  --archive: #1F4E79;
  --green: #2EE6A6;
  --orange: #FF7A1A;
  --silver: #A8B3BD;
  --ice: #EAF0F3;
  --graphite: #2F3E4E;
  --mint: #7FE3C0;
  --amber: #D98B00;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-cond: "Barlow Condensed", "Oswald", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --wrap-max: 1320px;
  --gutter: clamp(16px, 3.6vw, 44px);
  --bw: 2px;
  --shadow-hard: 6px 6px 0 var(--graphite);
}

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

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 80% at 6% 0%, rgba(46, 230, 166, 0.10), transparent 58%),
    radial-gradient(100% 72% at 100% 3%, rgba(255, 122, 26, 0.10), transparent 52%),
    linear-gradient(180deg, #0A1B2A 0%, #0A1B2A 44%, #081522 100%);
  background-attachment: fixed;
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, picture, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--ice);
}

h1 { font-size: clamp(30px, 4.4vw, 58px); }
h2 { font-size: clamp(24px, 2.8vw, 36px); }
h3 { font-size: clamp(19px, 1.8vw, 25px); }
h4 { font-size: 18px; }

p { max-width: 74ch; }

:focus-visible {
  outline: 3px solid var(--green);
  outline-offset: 3px;
}

::selection {
  background: var(--green);
  color: var(--ink);
}

/* ---------- 布局容器 ---------- */
.wrap {
  width: min(var(--wrap-max), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.section {
  padding-block: clamp(34px, 4.6vw, 72px);
}

.grid {
  display: grid;
  gap: clamp(14px, 1.8vw, 26px);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 900;
  padding: 10px 18px;
  background: var(--green);
  color: var(--ink);
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--ink);
  transform: translateY(-140%);
  transition: transform 0.18s ease;
}

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

/* ---------- 头部骨架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--ink);
  border-bottom: var(--bw) solid var(--graphite);
  box-shadow: 0 18px 32px -26px rgba(0, 0, 0, 0.95);
}

.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  overflow: hidden;
  pointer-events: none;
  z-index: 3;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--green) 0%, var(--mint) 46%, var(--orange) 100%);
  transition: transform 0.12s linear;
}

/* ---------- 头部上层：品牌轨道 ---------- */
.header-upper {
  background: var(--ink);
  border-bottom: 1px solid var(--graphite);
}

.header-upper__inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 20px);
  min-height: 66px;
  padding-block: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--green);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 900;
  line-height: 1;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--orange);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.brand:hover .brand__mark,
.brand:focus-visible .brand__mark {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--orange);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.brand__line {
  margin-top: 3px;
  font-family: var(--font-cond);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--silver);
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--orange);
  background: rgba(255, 122, 26, 0.08);
  border: 1px solid rgba(255, 122, 26, 0.4);
}

.version-chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

.header-note {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--silver);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.utility {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
}

.utility__link {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--silver);
  border: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.utility__link:hover {
  color: var(--green);
  border-color: var(--graphite);
}

.utility__link--cta {
  background: var(--green);
  color: var(--ink);
  border: 2px solid var(--green);
  box-shadow: 3px 3px 0 rgba(255, 122, 26, 0.85);
}

.utility__link--cta:hover {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--ink);
}

.utility__copy {
  appearance: none;
  padding: 6px 10px;
  background: transparent;
  border: 1px solid var(--graphite);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.utility__copy:hover {
  color: var(--green);
  border-color: var(--green);
}

/* ---------- 头部下层：栏目导航 ---------- */
.header-lower {
  position: relative;
  background: var(--ink-2);
}

.header-lower::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 168px;
  background: linear-gradient(180deg, rgba(46, 230, 166, 0.16), rgba(46, 230, 166, 0));
  clip-path: polygon(0 0, 100% 0, 58% 100%, 0 100%);
  pointer-events: none;
}

.header-lower__inner {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}

.nav {
  display: flex;
  align-items: stretch;
}

.nav__list {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
}

.nav__item { display: flex; }

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px clamp(9px, 1.1vw, 19px);
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ice);
  border-right: 1px solid var(--graphite);
  transition: color 0.16s ease, background-color 0.16s ease;
}

.nav__item:first-child .nav__link {
  border-left: 1px solid var(--graphite);
}

.nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--archive);
  transition: color 0.16s ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.2s ease;
}

.nav__link:hover {
  color: var(--green);
  background: rgba(46, 230, 166, 0.07);
}

.nav__link:hover .nav__num { color: var(--mint); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__link[aria-current="page"] {
  color: var(--green);
  background: rgba(46, 230, 166, 0.10);
}

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

.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: transparent;
  border: 2px solid var(--graphite);
  color: var(--ice);
  font-family: var(--font-cond);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.nav-toggle:hover {
  color: var(--green);
  border-color: var(--green);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
}

.nav-toggle__bars span {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }

.site-header[data-open] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(46px, 7vw, 96px);
  background: linear-gradient(180deg, var(--ink-2) 0%, #081524 100%);
  border-top: var(--bw) solid var(--graphite);
  color: var(--ice);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: clamp(96px, 22%, 260px);
  height: 4px;
  background: var(--orange);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 0.9fr 1.25fr;
  gap: clamp(22px, 3vw, 48px);
  padding-block: clamp(36px, 5vw, 66px);
}

.footer__brand-name {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 900;
  letter-spacing: 0.14em;
  line-height: 1.1;
  color: var(--ice);
}

.footer__brand-line {
  margin-top: 10px;
  font-family: var(--font-cond);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--green);
}

.footer__summary {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--silver);
}

.footer__title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--ice);
  border-bottom: 1px solid var(--graphite);
}

.footer__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.footer__links {
  display: grid;
  gap: 9px;
}

.footer__links a {
  display: inline-block;
  font-size: 14px;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer__links a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

.footer__contact {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
}

.contact-btn {
  display: block;
  width: 100%;
  padding: 8px 10px;
  text-align: left;
  background: rgba(31, 78, 121, 0.3);
  border: 1px solid var(--graphite);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.55;
  overflow-wrap: anywhere;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.contact-btn:hover {
  color: var(--green);
  border-color: var(--green);
  background: rgba(46, 230, 166, 0.1);
}

.contact-btn__label {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 5px;
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--orange);
  border: 1px solid rgba(255, 122, 26, 0.45);
}

.footer__address {
  padding: 8px 10px;
  border: 1px dashed var(--graphite);
  font-size: 12px;
  line-height: 1.65;
  color: var(--silver);
  overflow-wrap: anywhere;
}

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

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-block: 20px 28px;
  border-top: 1px solid var(--graphite);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--silver);
}

.footer__meta { color: var(--ice); }
.footer__legal { color: var(--silver); }

.footer__top {
  margin-left: auto;
  padding: 7px 14px;
  background: transparent;
  border: 1px solid var(--graphite);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer__top:hover {
  color: var(--green);
  border-color: var(--green);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  background: transparent;
  border: var(--bw) solid var(--graphite);
  color: var(--ice);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn--primary {
  background: var(--green);
  color: var(--ink);
  border-color: var(--green);
  box-shadow: 4px 4px 0 var(--orange);
}

.btn--primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--orange);
}

.btn--ghost {
  border-color: var(--silver);
  color: var(--ice);
}

.btn--ghost:hover {
  border-color: var(--green);
  color: var(--green);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.breadcrumb a {
  transition: color 0.16s ease;
}

.breadcrumb a:hover { color: var(--green); }

.breadcrumb__sep { color: var(--archive); }

.breadcrumb [aria-current="page"] { color: var(--ice); }

/* ---------- 文本工具 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-cond);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--green);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mint);
  background: rgba(46, 230, 166, 0.1);
  border: 1px solid rgba(46, 230, 166, 0.4);
}

/* ---------- 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: var(--bw) solid var(--graphite);
  background:
    repeating-linear-gradient(135deg, rgba(31, 78, 121, 0.3) 0 8px, rgba(10, 27, 42, 0.55) 8px 16px);
  box-shadow: var(--shadow-hard);
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(6, 16, 26, 0.24) 0 1px, transparent 1px 4px);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.media__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--silver);
  text-align: center;
}

/* ---------- 提示气泡 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 500;
  max-width: min(90vw, 440px);
  padding: 11px 20px;
  background: var(--green);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  overflow-wrap: anywhere;
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--orange);
  opacity: 0;
  transform: translate(-50%, 16px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast[data-visible] {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- 滚动显现 ---------- */
.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 平板 ---------- */
@media (max-width: 1180px) {
  .header-note { display: none; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__col--contact { grid-column: span 3; }
}

@media (max-width: 1000px) {
  .utility__copy { display: none; }
}

@media (max-width: 940px) {
  .nav-toggle {
    display: inline-flex;
    order: 1;
    margin-left: auto;
    margin-block: 8px;
  }

  .nav {
    order: 2;
    flex-basis: 100%;
    display: none;
    border-top: 1px solid var(--graphite);
  }

  .site-header[data-open] .nav {
    display: block;
  }

  .nav__list { flex-direction: column; }
  .nav__item { display: block; }

  .nav__link {
    display: flex;
    justify-content: flex-start;
    padding: 14px 14px 14px 16px;
    border-left: 0;
    border-right: 0;
    border-bottom: 1px solid var(--graphite);
  }

  .nav__item:first-child .nav__link { border-left: 0; }

  .nav__link::after {
    left: 0;
    right: auto;
    bottom: 0;
    width: 4px;
    height: 100%;
    transform: scaleY(0);
    transform-origin: 50% 0;
  }

  .nav__link:hover::after,
  .nav__link[aria-current="page"]::after {
    transform: scaleY(1);
  }

  .header-lower::before { width: 96px; }
}

/* ---------- 手机 ---------- */
@media (max-width: 720px) {
  body { font-size: 15.5px; }

  .header-upper__inner { min-height: 58px; gap: 8px; }
  .brand { gap: 9px; }
  .brand__mark { width: 34px; height: 34px; font-size: 18px; }
  .brand__name { font-size: 18px; }
  .brand__line { font-size: 9.5px; letter-spacing: 0.18em; }
  .utility__link { padding: 6px 11px; font-size: 12px; }

  .footer__grid { grid-template-columns: 1fr 1fr; gap: 26px 22px; }
  .footer__brand { grid-column: span 2; }
  .footer__col--contact { grid-column: span 2; }

  .footer__base { font-size: 11px; gap: 8px 18px; }
  .footer__top { margin-left: 0; }

  .toast { bottom: 16px; font-size: 12px; }
}

@media (max-width: 560px) {
  .version-chip { display: none; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__brand,
  .footer__col--contact { grid-column: auto; }
  .toast { width: calc(100vw - 32px); }
}

/* ---------- 动效偏好 ---------- */
@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;
  }

  .progress__bar { transition: none; }

  .reveal-ready [data-reveal],
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .brand:hover .brand__mark { transform: none; }
  .btn--primary:hover { transform: none; }
}