/* ============ 1. Token 与重置 ============ */
:root {
  --ink-950: #071320;
  --ink-900: #0C1A2B;
  --turf: #123D2B;
  --green: #17B45A;
  --green-soft: #7FD69B;
  --orange: #FF6A1F;
  --steel: #6C86A0;
  --steel-soft: #B9C7D4;
  --paper: #F4F7F5;
  --paper-line: #E6EDE9;
  --text: #1B2733;
  --white: #FFFFFF;
  --line-dark: rgba(185, 199, 212, 0.22);
  --line-dark-strong: rgba(185, 199, 212, 0.45);
  --rule-color: rgba(185, 199, 212, 0.28);
  --font-display: "Barlow Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --gutter: clamp(16px, 3vw, 40px);
  --header-h: 72px;
  --header-h-sm: 60px;
  --section-y: clamp(48px, 7vw, 96px);
  --radius: 2px;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
a { color: inherit; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(34px, 5.2vw, 72px); }
h2 { font-size: clamp(24px, 3vw, 44px); }
h3 { font-size: clamp(19px, 2vw, 28px); }
h4 { font-size: clamp(16px, 1.4vw, 20px); }

p {
  margin: 0 0 1em;
  max-width: 38em;
  word-break: break-word;
}
p:last-child { margin-bottom: 0; }

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

::selection {
  background: var(--green);
  color: var(--ink-950);
}

/* ============ 2. 通用工具类 ============ */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: var(--section-y) 0; }

.section--dark {
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(185, 199, 212, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(185, 199, 212, 0.08) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--white);
}

.section--turf {
  background-color: var(--turf);
  color: var(--white);
}

.grid { display: grid; gap: var(--gutter); }

.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.stack > * + * { margin-top: var(--stack, 16px); }

.eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}

.data-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.lead {
  max-width: 36em;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.72;
}

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--rule-color);
}
.rule--paper { --rule-color: var(--paper-line); }

/* ============ 3. 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn-accent {
  background: var(--orange);
  border-color: var(--orange);
  color: #1a0d05;
}
.btn-accent:hover { background: #ff8247; border-color: #ff8247; }

.btn-ghost {
  background: transparent;
  border-color: rgba(23, 180, 90, 0.5);
  color: var(--green-soft);
}
.btn-ghost:hover { background: rgba(23, 180, 90, 0.12); border-color: var(--green); color: var(--white); }

/* ============ 4. 头部命令栏 ============ */
.skip-link {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--green);
  color: #06210f;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 12px; }

.site-header {
  --h: var(--header-h);
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--ink-900);
  background-image: linear-gradient(to right, rgba(185, 199, 212, 0.10) 1px, transparent 1px);
  background-size: 64px 100%;
  border-bottom: 1px solid var(--line-dark);
  color: var(--white);
}
.site-header p { margin: 0; max-width: none; }

.site-header[data-condensed="true"] { --h: 52px; }

.header-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas: "brand nav rail";
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  width: 100%;
  max-width: 1360px;
  min-height: var(--h);
  margin: 0 auto;
  padding: 0 var(--gutter);
  transition: min-height 0.24s var(--ease);
}

.brand {
  grid-area: brand;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--green);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--green-soft);
  background: rgba(23, 180, 90, 0.10);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.25; }

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel);
  transition: opacity 0.2s var(--ease);
}
.site-header[data-condensed="true"] .brand-sub { opacity: 0; }

/* 导航 */
.site-nav {
  grid-area: nav;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.2vw, 18px);
  flex-wrap: nowrap;
}

.nav-item { display: block; }

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px 6px;
  border-bottom: 2px solid transparent;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--steel-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-link:hover { color: var(--white); border-bottom-color: var(--green); }
.nav-link[aria-current="page"] { color: var(--white); border-bottom-color: var(--orange); }

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.nav-link[aria-current="page"] .nav-index { color: var(--orange); }

.nav-foot { display: none; }

.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(23, 180, 90, 0.18);
}

/* 右侧状态与 CTA */
.header-rail {
  grid-area: rail;
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.status-label { color: var(--steel); }
.status-value { color: var(--green-soft); }

/* 移动抽屉按钮 */
.nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--line-dark-strong);
  border-radius: var(--radius);
  color: var(--steel-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--green); color: var(--white); }

.nav-toggle-bars { display: block; width: 18px; }
.nav-toggle-bars span {
  display: block;
  height: 1px;
  width: 18px;
  margin: 4px 0;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 进度线 */
.progress-rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(23, 180, 90, 0.14);
  overflow: hidden;
}
.progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(to right, var(--green), var(--green-soft));
  transition: width 0.12s linear;
}

/* ============ 5. 页脚 ============ */
.site-footer {
  background-color: var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(185, 199, 212, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(185, 199, 212, 0.09) 1px, transparent 1px);
  background-size: 64px 64px;
  border-top: 1px solid var(--line-dark);
  color: var(--steel-soft);
  padding: clamp(40px, 5vw, 72px) 0 28px;
}
.site-footer p { margin: 0; max-width: none; }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 44px);
}

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

.footer-mark {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.footer-tagline {
  margin-top: 6px;
  font-size: 13px;
  color: var(--steel);
}

.footer-meta {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(23, 180, 90, 0.9);
}

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

.footer-title {
  margin: 0 0 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-soft);
}

.footer-list { display: flex; flex-direction: column; gap: 6px; }

.footer-list li {
  font-size: 14px;
  line-height: 1.5;
  color: var(--steel-soft);
  word-break: break-word;
}

.footer-link {
  display: inline-block;
  padding: 2px 0;
  color: inherit;
  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(--green-soft); border-bottom-color: rgba(23, 180, 90, 0.6); }

.footer-contact li { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.02em; }

.footer-note {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.footer-copy { color: var(--steel); }

.footer-legal { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-legal li { font-size: 11px; }

.footer-icp {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ============ 6. 面包屑 ============ */
.breadcrumbs {
  padding: 14px 0;
  border-bottom: 1px solid var(--paper-line);
}
.breadcrumbs .breadcrumb-list { max-width: none; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
}

.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb-item + .breadcrumb-item::before { content: "/"; color: var(--steel-soft); }

.breadcrumb-link { color: inherit; text-decoration: none; border-bottom: 1px solid transparent; }
.breadcrumb-link:hover { color: var(--turf); border-bottom-color: var(--green); }

/* ============ 7. 图片容器 ============ */
.media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background-color: var(--ink-950);
  background-image:
    linear-gradient(to right, rgba(185, 199, 212, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(185, 199, 212, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(23, 180, 90, 0.35);
  pointer-events: none;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel);
}

/* ============ 8. 主题筛选 ============ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.filter-chip {
  appearance: none;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(23, 180, 90, 0.45);
  border-radius: var(--radius);
  color: var(--green-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.filter-chip:hover { border-color: var(--green); color: var(--white); }
.filter-chip[aria-pressed="true"] {
  background: var(--green);
  border-color: var(--green);
  color: #06210f;
}

.filter-item[hidden] { display: none; }

.filter-status {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

/* ============ 9. 显影 ============ */
[data-reveal] {
  opacity: 0;
  transition: opacity 0.5s var(--ease);
}
[data-reveal].is-in { opacity: 1; }

/* ============ 10. 响应式 ============ */
@media (max-width: 1080px) {
  .header-status { display: none; }
  .nav-link { font-size: 13px; }
}

@media (max-width: 960px) {
  .site-header { --h: var(--header-h-sm); }
  .site-header[data-condensed="true"] { --h: var(--header-h-sm); }

  .header-grid {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas: "brand toggle";
    min-height: var(--h);
  }

  .header-rail { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    padding: 12px var(--gutter) 24px;
    background-color: var(--ink-950);
    background-image:
      linear-gradient(to right, rgba(185, 199, 212, 0.08) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(185, 199, 212, 0.08) 1px, transparent 1px);
    background-size: 48px 48px;
    border-bottom: 1px solid var(--line-dark);
    box-shadow: 0 16px 32px rgba(3, 9, 16, 0.5);
  }

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

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }

  .nav-item + .nav-item { border-top: 1px solid var(--line-dark); }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 14px 2px;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding-left: 10px;
    font-size: 15px;
    white-space: normal;
  }
  .nav-link:hover { border-bottom-color: transparent; border-left-color: var(--green); }
  .nav-link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--orange);
    background: rgba(255, 106, 31, 0.08);
  }

  .nav-foot {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--line-dark);
  }

  .grid--split,
  .grid--thirds { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  body { font-size: 15px; }
  .brand-sub { display: none; }
  .nav-toggle-label { display: none; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
}

/* ============ 11. 无障碍偏好 ============ */
@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;
  }
  [data-reveal] { opacity: 1; }
  .progress-bar { transition: none; }
}