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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

:root {
  --ink-0: #040c18;
  --ink-1: #081729;
  --ink-2: #102a47;
  --cyan: #2fe0ce;
  --cyan-dim: rgba(47, 224, 206, 0.14);
  --amber: #f0b45a;
  --mist: #7e97bc;
  --warm: #b9b4a8;
  --paper: #edf5fa;
  --teal-deep: #0d6e72;
  --sand: #ddd8cd;
  --line: rgba(126, 151, 188, 0.24);
  --line-strong: rgba(126, 151, 188, 0.46);
  --font-heading: "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", sans-serif;
  --font-body: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", monospace;
  --font-serif: "Noto Serif SC", "Songti SC", serif;
  --wrap: 1320px;
  --gutter: clamp(18px, 4vw, 48px);
  --cut: 16px;
  --pill: 999px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink-1);
  background-image:
    linear-gradient(to right, rgba(126, 151, 188, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(126, 151, 188, 0.07) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  -webkit-font-smoothing: antialiased;
}

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

img {
  display: block;
}

figure {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

button {
  font: inherit;
}

::selection {
  background: var(--cyan);
  color: var(--ink-0);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* 2. 布局与通用排版 */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(48px, 7vw, 104px);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.coord {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

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

.lede {
  max-width: 46ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.8;
  color: rgba(237, 245, 250, 0.78);
}

/* 3. 切角面板 */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 36px);
  background: linear-gradient(158deg, rgba(16, 42, 71, 0.96), rgba(8, 23, 41, 0.94));
  border: 1px solid var(--line);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}

.panel--flat {
  background: rgba(16, 42, 71, 0.5);
}

/* 4. 按钮 */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: var(--line-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.3em;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-bd);
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

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

.btn--primary {
  --btn-bg: var(--cyan);
  --btn-fg: var(--ink-0);
  --btn-bd: var(--cyan);
  font-weight: 700;
}

.btn--primary:hover {
  --btn-bg: #6df0e2;
  --btn-bd: #6df0e2;
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: var(--line-strong);
}

.btn--ghost:hover {
  --btn-fg: var(--cyan);
  --btn-bd: var(--cyan);
  --btn-bg: rgba(47, 224, 206, 0.08);
}

.btn--amber {
  --btn-bg: var(--amber);
  --btn-fg: var(--ink-0);
  --btn-bd: var(--amber);
  font-weight: 700;
}

.btn--sm {
  padding: 0.52em 0.95em;
  font-size: 13.5px;
}

/* 5. 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  background: rgba(126, 151, 188, 0.12);
  border: 1px solid var(--line);
  clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
}

.tag--cyan {
  color: var(--cyan);
  border-color: rgba(47, 224, 206, 0.42);
  background: rgba(47, 224, 206, 0.1);
}

.tag--amber {
  color: var(--amber);
  border-color: rgba(240, 180, 90, 0.42);
  background: rgba(240, 180, 90, 0.1);
}

/* 6. 面包屑 */
.breadcrumbs {
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.breadcrumbs__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.breadcrumbs__sep {
  color: rgba(126, 151, 188, 0.5);
}

/* 7. 图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(16, 42, 71, 0.92), rgba(4, 12, 24, 0.94));
  border: 1px solid var(--line);
  clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
}

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

.media-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.media-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.media-frame--1x1 {
  aspect-ratio: 1 / 1;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(4, 12, 24, 0.92), rgba(4, 12, 24, 0));
}

/* 8. 分段切换 */
.tabbar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 26px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.tabbar__btn {
  appearance: none;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: rgba(126, 151, 188, 0.1);
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.tabbar__btn:hover {
  color: var(--paper);
  background: rgba(47, 224, 206, 0.14);
}

.tabbar__btn[aria-selected="true"] {
  color: var(--ink-0);
  background: var(--cyan);
  font-weight: 700;
}

/* 9. 显现动效协议 */
[data-reveal].is-hidden {
  opacity: 0;
  transform: translateY(14px);
}

[data-reveal].is-shown {
  opacity: 1;
  transform: none;
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

/* 10. 跳转链接 */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  font-weight: 700;
  color: var(--ink-0);
  background: var(--cyan);
  text-decoration: none;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: top 0.18s var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* 11. 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(4, 12, 24, 0.97) 0%, rgba(4, 12, 24, 0.86) 62%, rgba(4, 12, 24, 0) 100%);
  padding-bottom: 8px;
}

.status-strip {
  overflow: hidden;
  max-height: 64px;
  background: var(--ink-0);
  border-bottom: 1px solid rgba(126, 151, 188, 0.18);
  transition: max-height 0.3s var(--ease), opacity 0.22s var(--ease);
}

.site-header[data-scrolled="true"] .status-strip {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.status-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.status-strip__dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(47, 224, 206, 0.16);
}

.status-strip__item {
  color: var(--mist);
}

.status-strip__sep {
  color: rgba(126, 151, 188, 0.4);
}

.status-strip__meta {
  margin-left: auto;
  color: rgba(126, 151, 188, 0.72);
}

.header-rail {
  padding-top: 12px;
  position: relative;
}

.header-capsule {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  padding: 9px 12px 9px 18px;
  background: rgba(4, 12, 24, 0.86);
  border: 1px solid rgba(126, 151, 188, 0.28);
  border-radius: var(--pill);
  box-shadow: 0 20px 44px -28px rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(14px);
  transition: padding 0.24s var(--ease), background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.site-header[data-scrolled="true"] .header-capsule {
  padding-block: 5px;
  background: rgba(4, 12, 24, 0.95);
  border-color: rgba(126, 151, 188, 0.4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--paper);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-0);
  background: linear-gradient(135deg, var(--cyan), #7ff3e6);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

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

.brand__name {
  font-family: var(--font-heading);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.brand:hover .brand__name {
  color: var(--cyan);
}

.site-nav {
  margin-inline: auto;
}

.site-nav__list {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--mist);
  text-decoration: none;
  border-radius: var(--pill);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.site-nav__link:hover {
  color: var(--paper);
  background: rgba(47, 224, 206, 0.1);
}

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

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 1px;
  height: 2px;
  background: var(--cyan);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 7px 13px;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  cursor: pointer;
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

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

.nav-toggle__text {
  font-size: 13.5px;
  letter-spacing: 0.04em;
}

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

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

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

.scroll-progress {
  height: 2px;
  margin-top: 8px;
  background: rgba(126, 151, 188, 0.14);
  overflow: hidden;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: transform 0.1s linear;
}

/* 12. 页脚 */
.site-footer {
  margin-top: clamp(48px, 7vw, 104px);
  color: var(--paper);
  background: var(--ink-0);
  border-top: 1px solid rgba(47, 224, 206, 0.28);
}

.footer-entry {
  background: linear-gradient(90deg, rgba(47, 224, 206, 0.14), rgba(16, 42, 71, 0.6) 55%, rgba(4, 12, 24, 0.9));
  border-bottom: 1px solid var(--line);
}

.footer-entry__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 16px;
}

.footer-entry__label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--paper);
}

.footer-entry__dot {
  width: 6px;
  height: 6px;
  background: var(--amber);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(240, 180, 90, 0.16);
}

.footer-body {
  padding-block: clamp(36px, 5vw, 64px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.7fr 0.85fr 0.85fr 0.85fr 1.6fr;
  gap: clamp(20px, 3vw, 40px);
}

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

.brand--footer .brand__mark {
  width: 30px;
  height: 30px;
  font-size: 13px;
}

.brand--footer .brand__name {
  font-size: 15.5px;
}

.footer-brand__line {
  margin: 14px 0 8px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.footer-desc {
  margin: 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.footer-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-link {
  font-size: 14.5px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.footer-rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
}

.footer-row__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(126, 151, 188, 0.8);
}

.footer-row__value {
  color: var(--paper);
  word-break: break-all;
}

.copy-btn {
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  clip-path: polygon(5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%, 0 5px);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.copy-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.copy-btn[data-copied="true"] {
  color: var(--ink-0);
  background: var(--cyan);
  border-color: var(--cyan);
}

.footer-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(126, 151, 188, 0.9);
}

.footer-bottom {
  border-top: 1px solid rgba(126, 151, 188, 0.18);
  background: rgba(8, 23, 41, 0.7);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer-copy,
.footer-icp {
  margin: 0;
}

.footer-icp {
  color: rgba(126, 151, 188, 0.85);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.footer-legal__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer-legal__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 13. 响应式 */
@media (max-width: 1139px) {
  .header-actions .btn--ghost {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
  }

  .footer-contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 1023px) {
  html {
    scroll-padding-top: 96px;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    margin: 0;
    display: none;
    padding: 12px;
    background: rgba(4, 12, 24, 0.98);
    border: 1px solid rgba(126, 151, 188, 0.32);
    box-shadow: 0 28px 52px -32px #000;
    clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
  }

  .site-nav[data-open="true"] {
    display: block;
    animation: navDrop 0.2s var(--ease);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    display: block;
    padding: 12px 14px;
    font-size: 16px;
    border-radius: 0;
    clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  }

  .site-nav__link[aria-current="page"] {
    color: var(--paper);
    background: rgba(47, 224, 206, 0.14);
  }

  .site-nav__link[aria-current="page"]::after {
    display: none;
  }

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

  .header-actions {
    margin-left: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-desc {
    max-width: 46ch;
  }
}

@keyframes navDrop {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 767px) {
  body {
    font-size: 16px;
    line-height: 1.7;
    background-size: 64px 64px, 64px 64px;
  }

  .status-strip__meta {
    margin-left: 0;
    width: 100%;
  }

  .footer-entry__inner {
    align-items: flex-start;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-legal {
    margin-left: 0;
  }
}

@media (max-width: 599px) {
  .brand__sub {
    display: none;
  }

  .brand__mark {
    width: 30px;
    height: 30px;
    font-size: 13px;
  }

  .brand__name {
    font-size: 15px;
  }

  .header-capsule {
    padding: 8px 10px 8px 12px;
    gap: 8px;
  }

  .header-actions .btn--primary {
    padding: 0.45em 0.7em;
    font-size: 12.5px;
  }

  .nav-toggle {
    padding: 6px 10px;
  }

  .nav-toggle__text {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* 14. 可访问性：减少动效 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal].is-hidden {
    opacity: 1;
    transform: none;
  }
}