/* ==================================================
   AI场上 全站共享样式 /assets/site.css
================================================== */

:root {
  /* 色彩系统 */
  --color-space-blue: #0B1D3A;
  --color-deep-blue: #14325C;
  --color-neon-green: #00FF88;
  --color-turquoise: #0AF0D0;
  --color-white: #FFFFFF;
  --color-light-gray: #E8EDF2;
  --color-mid-gray: #A0AABB;
  --color-dark-gray: #1A2438;
  --color-light-blue: #B5CDFF;
  --color-warning-orange: #FF6B35;

  /* 字体系统 */
  --font-heading: "Oswald", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-data: "Roboto Mono", "SFMono-Regular", Consolas, monospace;

  /* 布局系统 */
  --container-width: 1200px;
  --nav-height: 64px;
  --radius-pill: 999px;
  --radius-sharp: 0;

  /* 动效 */
  --transition-fast: 180ms ease;
  --transition-base: 300ms cubic-bezier(0.25, 0.1, 0.15, 1);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-white);
  background: var(--color-space-blue);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
}

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

a {
  color: var(--color-light-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

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

::selection {
  background: var(--color-neon-green);
  color: var(--color-space-blue);
}

:focus-visible {
  outline: 2px solid var(--color-neon-green);
  outline-offset: 3px;
}

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--color-space-blue);
}
::-webkit-scrollbar-thumb {
  background: var(--color-deep-blue);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-neon-green);
}

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

#main-content {
  display: block;
}

/* ---------- 章节与编号 ---------- */
.section {
  padding: 72px 0;
}

.section-heading {
  font-family: var(--font-heading);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-white);
}

.section-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-neon-green);
  margin-bottom: 10px;
}

.section-index::before {
  content: "/";
  color: var(--color-turquoise);
  font-weight: 700;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid transparent;
  border-radius: var(--radius-sharp);
  cursor: pointer;
  color: inherit;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-base);
}

.btn-primary {
  background: var(--color-neon-green);
  border-color: var(--color-neon-green);
  color: var(--color-space-blue);
}

.btn-primary:hover {
  background: var(--color-turquoise);
  border-color: var(--color-turquoise);
  color: var(--color-space-blue);
  box-shadow: 0 0 28px rgba(0, 255, 136, 0.3);
}

.btn-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

.btn-outline:hover {
  border-color: var(--color-neon-green);
  color: var(--color-neon-green);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.12);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
}

.breadcrumbs a {
  color: var(--color-mid-gray);
}

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

.breadcrumbs-sep {
  color: var(--color-neon-green);
}

.breadcrumbs-current {
  color: var(--color-white);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.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));
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-deep-blue);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sharp);
  padding: 24px;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-neon-green);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

/* ---------- 数据标签 ---------- */
.data-label {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
}

.data-value {
  font-family: var(--font-data);
  font-size: 1.2em;
  font-weight: 700;
  color: var(--color-neon-green);
}

/* ---------- 图片帧 ---------- */
.image-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background:
    linear-gradient(rgba(0, 255, 136, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.12) 1px, transparent 1px),
    linear-gradient(135deg, transparent 48%, rgba(0, 255, 136, 0.7) 48%, rgba(0, 255, 136, 0.7) 52%, transparent 52%),
    var(--color-dark-gray);
  background-size: 24px 24px, 24px 24px, 100% 100%, auto;
}

.image-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.timeline {
  position: relative;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 0;
  left: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-neon-green), var(--color-turquoise), transparent);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--color-space-blue);
  border: 2px solid var(--color-neon-green);
  border-radius: 50%;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

/* ---------- 斜切装饰 ---------- */
.diagonal-accent {
  display: block;
  height: 6px;
  border: 0;
  background: repeating-linear-gradient(135deg, var(--color-neon-green) 0 10px, transparent 10px 20px);
  opacity: 0.85;
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9999;
  padding: 10px 18px;
  background: var(--color-neon-green);
  color: var(--color-space-blue);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sharp);
  transform: translateY(-250%);
  transition: transform var(--transition-fast);
}

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

/* ---------- 滚动进度条 ---------- */
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 2000;
  width: 100%;
  height: 3px;
  pointer-events: none;
}

.site-progress::after {
  content: "";
  display: block;
  width: var(--scroll-pct, 0%);
  height: 100%;
  background: linear-gradient(90deg, var(--color-neon-green), var(--color-turquoise));
  transition: width 160ms linear;
}

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 14px 20px;
  background: transparent;
}

.site-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  overflow: hidden;
  background: rgba(11, 29, 58, 0.88);
  border: 1px solid rgba(0, 255, 136, 0.28);
  border-radius: var(--radius-pill);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

@supports not ((backdrop-filter: blur(14px)) or (-webkit-backdrop-filter: blur(14px))) {
  .site-nav {
    background: rgba(11, 29, 58, 0.97);
  }
}

.site-nav-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
}

.site-nav-strip-tag {
  padding: 1px 8px;
  background: rgba(0, 255, 136, 0.12);
  color: var(--color-neon-green);
  font-weight: 700;
}

.site-nav-strip-desc {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--color-light-gray);
}

.site-nav-strip-mark {
  width: 6px;
  height: 6px;
  margin-left: auto;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-neon-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.2);
  animation: nav-pulse 2.4s ease-in-out infinite;
}

@keyframes nav-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.75); }
}

.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--nav-height);
  padding: 10px 12px 10px 20px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-white);
  flex-shrink: 0;
}

.site-brand:hover .brand-name {
  color: var(--color-neon-green);
}

.brand-mark {
  position: relative;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  background:
    linear-gradient(rgba(0, 255, 136, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 136, 0.22) 1px, transparent 1px),
    var(--color-deep-blue);
  background-size: 9px 9px;
  border: 1px solid var(--color-neon-green);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 46%, var(--color-neon-green) 46%, var(--color-neon-green) 54%, transparent 54%);
}

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
  transition: color var(--transition-fast);
}

.brand-sub {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-neon-green);
}

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

.nav-link {
  padding: 9px 15px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-white);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-space-blue);
  background: var(--color-neon-green);
  border-color: var(--color-neon-green);
}

.nav-link[aria-current="page"] {
  color: var(--color-space-blue);
  background: var(--color-neon-green);
  border-color: var(--color-neon-green);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius-pill);
  color: var(--color-white);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

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

.nav-toggle-label {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-toggle-icon {
  position: relative;
  width: 16px;
  height: 12px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-neon-green);
  transition: transform var(--transition-fast), top var(--transition-fast);
}

.nav-toggle-icon::before {
  top: 0;
}

.nav-toggle-icon::after {
  top: 10px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  top: 5px;
  transform: rotate(-45deg);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 80px;
  background: var(--color-space-blue);
  border-top: 3px solid var(--color-neon-green);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 32px 32px;
}

.site-footer .container {
  position: relative;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.9fr 1.1fr;
  gap: 40px;
  padding: 56px 0 40px;
}

.footer-brand-col {
  max-width: 460px;
}

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

.footer-brand:hover {
  color: var(--color-neon-green);
}

.footer-brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--color-neon-green);
  color: var(--color-space-blue);
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-brand-name small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: none;
  color: var(--color-mid-gray);
}

.footer-tagline {
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-neon-green);
}

.footer-statement {
  margin-top: 6px;
  color: var(--color-mid-gray);
  font-size: 14px;
  line-height: 1.6;
}

.footer-trust {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 3px solid var(--color-neon-green);
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-mid-gray);
  font-size: 13px;
  line-height: 1.7;
}

.footer-col {
  padding-left: 28px;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-white);
}

.footer-index {
  padding: 2px 7px;
  background: rgba(0, 255, 136, 0.12);
  color: var(--color-neon-green);
  font-family: var(--font-data);
  font-size: 13px;
}

.footer-list li + li {
  margin-top: 10px;
}

.footer-link {
  color: var(--color-light-blue);
  font-size: 15px;
}

.footer-link:hover {
  color: var(--color-neon-green);
}

.footer-contact-item {
  display: flex;
  gap: 10px;
  color: var(--color-light-gray);
  font-size: 14px;
  line-height: 1.6;
}

.footer-contact-label {
  flex-shrink: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 20px 0 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-copyright {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-mid-gray);
}

.footer-icp {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--color-mid-gray);
}

/* ---------- 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 600ms ease var(--reveal-delay, 0ms),
    transform 700ms cubic-bezier(0.25, 0.1, 0.15, 1) var(--reveal-delay, 0ms);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 880px) {
  .section {
    padding: 56px 0;
  }

  .site-nav-inner {
    flex-wrap: wrap;
    padding: 12px 16px 12px 20px;
  }

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

  .site-nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 6px 0 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }

  .site-nav[data-open="true"] .site-nav-links {
    display: flex;
  }

  .nav-link {
    border: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    padding: 12px 10px;
    white-space: normal;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    background: rgba(0, 255, 136, 0.1);
    border-left-color: var(--color-neon-green);
    color: var(--color-neon-green);
    font-weight: 600;
  }
}

@media (max-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
    max-width: none;
  }

  .footer-col {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 560px) {
  .site-header {
    padding: 10px;
  }

  .site-nav-strip {
    padding: 6px 16px;
  }

  .site-nav-inner {
    padding: 10px 12px 10px 14px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-sub {
    font-size: 9px;
  }

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

/* ---------- 减少动效 ---------- */
@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;
    transition-delay: 0ms !important;
  }

  .card:hover {
    transform: none;
  }

  html.js [data-reveal] {
    opacity: 0;
    transform: none;
    transition: opacity 120ms ease !important;
  }

  html.js [data-reveal].is-revealed {
    opacity: 1;
  }
}