/* ============================================================
   壹号站 · site.css
   职责：全站共享样式 / 技术蓝图式数据档案视觉系统
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
  --color-bg: #0A192F;
  --color-bg-deep: #020C1B;
  --color-bg-panel: #0F2542;
  --color-accent: #00FF9D;
  --color-gold: #D4AF37;
  --color-cyan: #00E5FF;
  --color-violet: #8A2BE2;
  --color-text: #CCD6F6;
  --color-text-muted: #8892B0;
  --color-line: rgba(0, 229, 255, 0.16);
  --color-line-dim: rgba(136, 146, 176, 0.18);

  --font-title: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-body: 'JetBrains Mono', 'Fira Code', Consolas, 'Courier New', monospace;

  --container-w: 1200px;
  --container-narrow: 960px;
  --header-h: 72px;
  --header-top-h: 36px;

  --trans: 0.25s ease;
  --trans-slow: 0.4s ease;
  --clip: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    linear-gradient(90deg, rgba(0, 229, 255, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(0, 229, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-cyan);
  text-decoration: none;
  transition: color var(--trans), border-color var(--trans);
}

a:hover {
  color: var(--color-accent);
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-title);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  text-wrap: balance;
}

h1 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

h2 {
  font-size: clamp(1.375rem, 2.2vw, 1.75rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  text-wrap: pretty;
}

code,
pre {
  font-family: var(--font-body);
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg-deep);
}

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

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  text-align: center;
  border-radius: 0;
  border: 1px solid var(--color-line);
  clip-path: var(--clip);
  background: var(--color-bg-panel);
  color: var(--color-text);
  transition: color var(--trans), background var(--trans), border-color var(--trans), filter var(--trans);
}

.btn:hover {
  color: var(--color-cyan);
  border-color: var(--color-cyan);
  filter: drop-shadow(0 0 10px rgba(0, 229, 255, 0.25));
}

.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg-deep);
}

.btn--accent:hover {
  background: #00ffa8;
  border-color: #00ffa8;
  color: var(--color-bg-deep);
  filter: drop-shadow(0 0 12px rgba(0, 255, 157, 0.4));
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-cyan);
  color: var(--color-cyan);
}

.btn--ghost:hover {
  background: rgba(0, 229, 255, 0.08);
  border-color: var(--color-accent);
  color: var(--color-accent);
  filter: drop-shadow(0 0 10px rgba(0, 255, 157, 0.2));
}

.btn--outline {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-text-muted);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 0.8125rem;
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1rem;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: 16px 0;
}

.breadcrumbs a {
  color: var(--color-text-muted);
  transition: color var(--trans);
}

.breadcrumbs a:hover {
  color: var(--color-cyan);
}

.breadcrumbs__sep {
  color: var(--color-line);
}

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

/* ---------- 章节标题 ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.section-head__index {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--color-cyan);
  letter-spacing: 0.08em;
}

.section-head__title {
  font-family: var(--font-title);
  font-size: clamp(1.375rem, 2.2vw, 1.75rem);
  font-weight: 700;
  color: var(--color-text);
}

.section-head__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  width: 100%;
}

/* ---------- 响应式栅格 ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ---------- 档案资料卡 ---------- */
.data-card {
  position: relative;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-line);
  padding: 20px;
  transition: border-color var(--trans), box-shadow var(--trans), transform var(--trans);
}

.data-card:hover {
  border-color: var(--color-cyan);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.08), 0 8px 24px rgba(2, 12, 27, 0.4);
  transform: translateY(-2px);
}

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-panel);
  border: 1px solid var(--color-line);
}

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

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

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

.media-frame[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 6px 10px;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  color: var(--color-cyan);
  background: rgba(2, 12, 27, 0.8);
  border-top: 1px solid var(--color-line);
}

/* ---------- 数据标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  border: 1px solid var(--color-line);
  color: var(--color-text-muted);
  background: rgba(2, 12, 27, 0.4);
}

.tag--gold {
  color: var(--color-gold);
  border-color: rgba(212, 175, 55, 0.45);
}

.tag--violet {
  color: var(--color-violet);
  border-color: rgba(138, 43, 226, 0.45);
}

.tag--cyan {
  color: var(--color-cyan);
  border-color: rgba(0, 229, 255, 0.45);
}

.tag--green {
  color: var(--color-accent);
  border-color: rgba(0, 255, 157, 0.45);
}

/* ---------- 数据表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  background: var(--color-bg-panel);
}

.table-wrap table {
  min-width: 640px;
}

.table-wrap th {
  font-family: var(--font-title);
  font-size: 0.8125rem;
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  color: var(--color-cyan);
  border-bottom: 1px solid var(--color-line);
  background: rgba(2, 12, 27, 0.5);
  white-space: nowrap;
}

.table-wrap td {
  padding: 12px 16px;
  font-size: 0.8125rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-line-dim);
}

.table-wrap tr:last-child td {
  border-bottom: 0;
}

.table-wrap tr:hover td {
  background: rgba(0, 229, 255, 0.04);
}

/* ---------- 正文排版 ---------- */
.content {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text);
}

.content h2 {
  margin-top: 48px;
  margin-bottom: 16px;
}

.content h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}

.content p {
  margin-bottom: 16px;
}

.content ul {
  margin-bottom: 16px;
}

.content ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
}

.content ul li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.content a {
  color: var(--color-cyan);
  border-bottom: 1px solid rgba(0, 229, 255, 0.3);
}

.content a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 辅助实用类 ---------- */
.u-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1000;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan));
  transform: scaleX(0);
  transform-origin: left;
  pointer-events: none;
  box-shadow: 0 0 8px rgba(0, 255, 157, 0.4);
}

/* ---------- 辅助跳转 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-bg-deep);
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 0.875rem;
  line-height: 1.2;
  clip-path: var(--clip);
  transition: top var(--trans);
}

.skip-link:focus {
  top: 16px;
  color: var(--color-bg-deep);
}

/* ---------- 头部整体 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 25, 47, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}

/* 头部上层状态条 */
.header-top {
  background: rgba(2, 12, 27, 0.88);
  border-bottom: 1px solid rgba(0, 229, 255, 0.08);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-top-h);
  gap: 16px;
}

.header-top__claim {
  color: var(--color-text-muted);
  font-family: var(--font-body);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-top__status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  flex-shrink: 0;
}

.header-top__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
  animation: status-pulse 2.4s infinite ease-in-out;
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

/* 头部主栏 */
.header-main {
  position: relative;
}

.header-main__inner {
  position: relative;
  display: flex;
  align-items: center;
  min-height: var(--header-h);
  gap: 16px;
}

/* 品牌标识 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  flex-shrink: 0;
}

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

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  background: var(--color-accent);
  color: var(--color-bg-deep);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.125rem;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  filter: drop-shadow(0 0 8px rgba(0, 255, 157, 0.3));
}

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

.brand__name {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--color-text);
  letter-spacing: 0.06em;
}

.brand__sub {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  margin-top: 3px;
}

/* 主导航 */
.site-nav {
  margin-left: auto;
  min-width: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav__item {
  list-style: none;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 14px;
  font-family: var(--font-title);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.2;
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color var(--trans);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--trans), background var(--trans);
}

.site-nav__link:hover {
  color: var(--color-text);
}

.site-nav__link:hover::after {
  transform: scaleX(1);
  background: var(--color-cyan);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-cyan);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.35);
}

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

/* 头部操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: 1px solid var(--color-line);
  background: rgba(2, 12, 27, 0.6);
  transition: border-color var(--trans), background var(--trans);
}

.nav-toggle:hover {
  border-color: var(--color-cyan);
  background: rgba(0, 229, 255, 0.06);
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  width: 16px;
  height: 2px;
  background: var(--color-cyan);
  transition: transform var(--trans), opacity var(--trans), background var(--trans);
}

.nav-toggle__bar:nth-child(1) {
  top: 12px;
}

.nav-toggle__bar:nth-child(2) {
  top: 19px;
}

.nav-toggle__bar:nth-child(3) {
  top: 26px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-line);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan) 45%, var(--color-violet));
  opacity: 0.8;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding: 56px 0 40px;
}

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

.footer-brand__mark {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.06em;
  color: var(--color-text);
}

.footer-brand__mark span {
  color: var(--color-accent);
}

.footer-brand__about {
  margin-top: 14px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 300px;
}

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

.footer-nav__title,
.footer-contact__title {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-cyan);
  margin-bottom: 14px;
}

.footer-nav__list li + li {
  margin-top: 8px;
}

.footer-nav__list a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  transition: color var(--trans), text-shadow var(--trans);
}

.footer-nav__list a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 10px rgba(0, 255, 157, 0.3);
}

.footer-nav__list a[aria-current="page"] {
  color: var(--color-accent);
}

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

.footer-contact__item {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.footer-contact__note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-line-dim);
  font-size: 0.75rem;
  color: var(--color-gold);
  letter-spacing: 0.04em;
}

.footer-trust-strip {
  border-top: 1px solid var(--color-line-dim);
  padding: 14px 0;
  text-align: center;
}

.footer-trust-strip p {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--color-gold);
}

.footer-bottom {
  border-top: 1px solid var(--color-line-dim);
  padding: 18px 0;
}

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

.footer-bottom__inner p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.footer-icp {
  letter-spacing: 0.04em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background: rgba(10, 25, 47, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 2px solid var(--color-accent);
    box-shadow: 0 20px 40px rgba(2, 12, 27, 0.6);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity var(--trans), transform var(--trans), visibility 0s linear var(--trans);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
    transition: opacity var(--trans), transform var(--trans);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 6px 0;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 14px 24px;
    font-size: 1rem;
    border-bottom: 1px solid var(--color-line-dim);
    color: var(--color-text);
  }

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

  .site-nav__link:hover,
  .site-nav__link[aria-current="page"] {
    background: rgba(0, 229, 255, 0.06);
    color: var(--color-cyan);
    text-shadow: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-h: 60px;
    --header-top-h: 28px;
  }

  .container {
    padding-inline: 16px;
  }

  .btn {
    padding: 10px 18px;
    font-size: 0.875rem;
  }

  .brand__sub {
    display: none;
  }

  .brand__mark {
    width: 34px;
    height: 34px;
    font-size: 1rem;
  }

  .brand__name {
    font-size: 1.125rem;
  }

  .header-top__claim {
    display: none;
  }

  .header-top__inner {
    justify-content: flex-end;
  }

  .header-actions {
    gap: 8px;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .footer-bottom__inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 360px) {
  .header-cta {
    display: none;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}