/* ============ 亿兆中国官方主站 · 全站共享样式 /assets/site.css ============ */

/* ---------- 1. 变量与重置 ---------- */
:root {
  --c-bg-dark: #0A1C2E;
  --c-bg-main: #0F2D4A;
  --c-bg-mid: #1B4F72;
  --c-accent: #00FFA3;
  --c-alert: #FF7A1A;
  --c-bg-light: #F2F6FA;
  --c-line: #C8D3E0;
  --c-text-dark: #E8F0FF;
  --c-text-light: #33475B;
  --font-head: "Noto Sans SC", "Alibaba PuHuiTi", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --max-w: 1280px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  scrollbar-color: #1B4F72 #0A1C2E;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-light);
  background-color: var(--c-bg-light);
  background-image:
    linear-gradient(rgba(27, 79, 114, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 79, 114, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a {
  color: inherit;
}

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

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

:focus-visible {
  outline: 3px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

#main-content {
  width: 100%;
  flex: 1 0 auto;
}

#main-content:focus {
  outline: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--c-bg-main);
  line-height: 1.4;
}

/* ---------- 2. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -120%;
  left: 16px;
  z-index: 1300;
  padding: 10px 20px;
  background: var(--c-accent);
  color: var(--c-bg-dark);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  opacity: 0;
  transition: top var(--transition), opacity var(--transition);
}

.skip-link:focus-visible {
  top: 0;
  opacity: 1;
}

/* ---------- 3. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

.container--narrow {
  max-width: 860px;
}

.spacer {
  height: var(--space-4);
}

.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }

/* ---------- 4. 头部框架 ---------- */
.hdr {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--c-bg-dark);
  border-bottom: 1px solid rgba(232, 240, 255, 0.14);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.25);
}

.hdr-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 2;
  background: linear-gradient(90deg, var(--c-accent), var(--c-alert));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.hdr__frame {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 10px var(--space-3);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2);
}

.hdr__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-self: start;
  min-width: 0;
  padding: 4px 12px;
  border: 1px solid rgba(0, 255, 163, 0.28);
  border-radius: var(--radius-pill);
  background: rgba(10, 28, 46, 0.5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--c-text-dark);
  white-space: nowrap;
}

.hdr__status--right {
  justify-self: end;
  border-color: rgba(255, 122, 26, 0.35);
}

.hdr__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(0, 255, 163, 0.6);
}

.hdr__dot--warn {
  background: var(--c-alert);
  box-shadow: 0 0 8px rgba(255, 122, 26, 0.6);
}

.hdr__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-self: center;
  text-decoration: none;
  color: var(--c-text-dark);
  border-radius: var(--radius-sm);
}

.hdr__brand-badge {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  color: var(--c-bg-dark);
  background: var(--c-accent);
  border-radius: 14px;
  box-shadow: 0 0 0 1px rgba(0, 255, 163, 0.3), 0 0 18px rgba(0, 255, 163, 0.18);
}

.hdr__brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.hdr__brand-name {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.hdr__brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--c-accent);
  text-transform: uppercase;
}

.hdr__nav {
  background: rgba(15, 45, 74, 0.5);
  border-top: 1px solid rgba(232, 240, 255, 0.1);
  border-bottom: 1px solid rgba(232, 240, 255, 0.14);
}

.hdr__list {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
  padding: 6px var(--space-3);
}

.hdr__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-text-dark);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.hdr__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: rgba(232, 240, 255, 0.42);
}

.hdr__lbl {
  display: inline-block;
}

.hdr__link:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(0, 255, 163, 0.35);
  color: var(--c-accent);
}

.hdr__link:hover .hdr__idx {
  color: var(--c-accent);
}

.hdr__link[aria-current="page"] {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-bg-dark);
  box-shadow: 0 0 16px rgba(0, 255, 163, 0.25);
}

.hdr__link[aria-current="page"] .hdr__idx {
  color: var(--c-bg-dark);
}

.hdr__toggle {
  display: none;
}

/* ---------- 5. 页脚框架 ---------- */
.ftr {
  flex-shrink: 0;
  background: var(--c-bg-dark);
  color: var(--c-text-dark);
  border-top: 1px solid rgba(232, 240, 255, 0.12);
}

.ftr__strip {
  height: 4px;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-accent) 24%, transparent 24%, transparent 72%, var(--c-alert) 72%, var(--c-alert) 100%);
}

.ftr__body {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-4) var(--space-5);
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}

.ftr__brand {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.ftr__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-accent);
  margin-bottom: var(--space-3);
}

.ftr__note {
  max-width: 460px;
  font-size: 13px;
  line-height: 1.9;
  color: rgba(232, 240, 255, 0.72);
}

.ftr__conn {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2;
  letter-spacing: 0.03em;
  color: rgba(232, 240, 255, 0.85);
}

.ftr__col {
  min-width: 0;
}

.ftr__title {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--c-accent);
  padding-bottom: 6px;
  margin-bottom: var(--space-2);
  border-bottom: 1px solid rgba(0, 255, 163, 0.22);
}

.ftr__links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ftr__links a {
  display: inline-block;
  padding: 4px 0;
  color: rgba(232, 240, 255, 0.82);
  text-decoration: none;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), padding-left var(--transition), border-bottom-color var(--transition);
}

.ftr__links a:hover {
  color: var(--c-accent);
  padding-left: 6px;
  border-bottom-color: var(--c-accent);
}

.ftr__meta {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px var(--space-3);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 6px 16px;
  border-top: 1px solid rgba(232, 240, 255, 0.12);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(232, 240, 255, 0.5);
}

/* ---------- 6. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 980;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(0, 255, 163, 0.45);
  border-radius: var(--radius-pill);
  background: rgba(10, 28, 46, 0.92);
  color: var(--c-accent);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), background-color var(--transition), color var(--transition);
}

.back-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--c-accent);
  color: var(--c-bg-dark);
}

.back-top__txt {
  display: inline-block;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition), transform 0.1s ease;
}

.btn--primary {
  background: var(--c-accent);
  color: var(--c-bg-dark);
}

.btn--primary:hover {
  background: #7dffd0;
  box-shadow: 0 0 24px rgba(0, 255, 163, 0.35);
}

.btn--ghost {
  background: transparent;
  color: var(--c-text-dark);
  border-color: rgba(232, 240, 255, 0.3);
}

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

.btn--alert {
  background: var(--c-alert);
  color: var(--c-bg-dark);
}

.btn--alert:hover {
  background: #ff8b3d;
  box-shadow: 0 0 20px rgba(255, 122, 26, 0.4);
}

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

/* ---------- 8. 标签与状态行 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  background: var(--c-alert);
  color: var(--c-bg-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.tag--green {
  background: var(--c-accent);
}

.tag--outline {
  background: transparent;
  border: 1px solid var(--c-alert);
  color: var(--c-alert);
}

.statusline {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  padding: 8px 16px;
  border: 1px solid rgba(232, 240, 255, 0.16);
  border-radius: var(--radius-pill);
  background: rgba(10, 28, 46, 0.55);
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(232, 240, 255, 0.75);
}

.statusline__dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  display: inline-block;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(0, 255, 163, 0.6);
}

.statusline__dot--warn {
  background: var(--c-alert);
  box-shadow: 0 0 8px rgba(255, 122, 26, 0.6);
}

.statusline b {
  color: var(--c-accent);
  font-weight: 700;
}

.statusline--light {
  background: #ffffff;
  border-color: var(--c-line);
  color: var(--c-text-light);
}

.statusline--light b {
  color: var(--c-bg-mid);
}

/* ---------- 9. 面包屑 ---------- */
.crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
}

.crumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  align-items: center;
}

.crumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(232, 240, 255, 0.5);
}

.crumb__item + .crumb__item::before {
  content: "/";
  color: rgba(232, 240, 255, 0.35);
}

.crumb__link {
  color: rgba(232, 240, 255, 0.85);
  text-decoration: none;
}

.crumb__link:hover {
  color: var(--c-accent);
}

.crumb__item[aria-current="page"] {
  color: var(--c-accent);
}

.crumb--light .crumb__item {
  color: var(--c-text-light);
}

.crumb--light .crumb__item + .crumb__item::before {
  color: var(--c-line);
}

.crumb--light .crumb__link {
  color: var(--c-text-light);
}

.crumb--light .crumb__link:hover {
  color: var(--c-bg-mid);
}

.crumb--light .crumb__item[aria-current="page"] {
  color: var(--c-bg-mid);
}

/* ---------- 10. 封面首屏 ---------- */
.hero {
  position: relative;
  background: var(--c-bg-dark);
  color: var(--c-text-dark);
  padding: var(--space-6) 0;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(0, 255, 163, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 163, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(90deg, transparent 10%, #000 55%, transparent 90%);
  mask-image: linear-gradient(90deg, transparent 10%, #000 55%, transparent 90%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  right: -140px;
  top: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 255, 163, 0.16) 0%, rgba(27, 79, 114, 0.08) 40%, transparent 68%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.18;
  letter-spacing: 0.02em;
  color: var(--c-text-dark);
  margin-bottom: var(--space-2);
}

.hero__lead {
  max-width: 620px;
  font-size: 16px;
  color: rgba(232, 240, 255, 0.78);
  margin-bottom: var(--space-4);
}

.hero--light {
  background: var(--c-bg-light);
  color: var(--c-text-light);
  border-bottom: 1px solid var(--c-line);
}

.hero--light .hero__title {
  color: var(--c-bg-main);
}

.hero--light .hero__lead {
  color: var(--c-text-light);
}

/* ---------- 11. 章节标题 ---------- */
.section-title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 24px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--c-bg-main);
  margin-bottom: var(--space-3);
}

.section-title__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--c-alert);
}

.section-title__en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-bg-mid);
}

.section-title--light {
  color: var(--c-text-dark);
}

.section-title--light .section-title__en {
  color: rgba(232, 240, 255, 0.5);
}

/* ---------- 12. 面板与索引列表 ---------- */
.panel {
  background: var(--c-bg-light);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.panel--dark {
  background: var(--c-bg-main);
  border-color: rgba(232, 240, 255, 0.12);
  color: var(--c-text-dark);
}

.panel--inset {
  background: var(--c-bg-dark);
  border-color: rgba(232, 240, 255, 0.1);
  color: var(--c-text-dark);
}

.panel__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 8px;
}

.index-list {
  border-top: 1px solid var(--c-line);
}

.index-list__item {
  border-bottom: 1px solid var(--c-line);
}

.index-list__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 6px;
  position: relative;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text-light);
  text-decoration: none;
  transition: padding-left var(--transition), background-color var(--transition);
}

.index-list__link::before {
  content: "";
  position: absolute;
  left: -1px;
  width: 3px;
  height: 18px;
  border-radius: 3px;
  background: var(--c-alert);
  opacity: 0;
  transform: scaleY(0.5);
  transition: opacity var(--transition), transform var(--transition);
}

.index-list__link:hover {
  padding-left: 12px;
  background: rgba(27, 79, 114, 0.06);
}

.index-list__link:hover::before {
  opacity: 1;
  transform: scaleY(1);
}

.index-list__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-bg-mid);
}

.index-list__meta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-line);
}

.index-list--dark {
  border-top-color: rgba(232, 240, 255, 0.14);
}

.index-list--dark .index-list__item {
  border-bottom-color: rgba(232, 240, 255, 0.14);
}

.index-list--dark .index-list__link {
  color: var(--c-text-dark);
}

.index-list--dark .index-list__link:hover {
  background: rgba(0, 255, 163, 0.08);
}

.index-list--dark .index-list__idx {
  color: var(--c-accent);
}

.index-list--dark .index-list__meta {
  color: rgba(232, 240, 255, 0.45);
}

/* ---------- 13. 栅格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.g-col-3 { grid-column: span 3; }
.g-col-4 { grid-column: span 4; }
.g-col-5 { grid-column: span 5; }
.g-col-6 { grid-column: span 6; }
.g-col-7 { grid-column: span 7; }
.g-col-8 { grid-column: span 8; }
.g-col-9 { grid-column: span 9; }
.g-col-12 { grid-column: 1 / -1; }

/* ---------- 14. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  min-height: 140px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(0, 255, 163, 0.1), transparent 42%),
    linear-gradient(135deg, var(--c-bg-dark), var(--c-bg-mid));
  border: 1px solid rgba(232, 240, 255, 0.14);
}

.media::after {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

.media--banner::after {
  padding-bottom: 26%;
}

.media--square::after {
  padding-bottom: 100%;
}

.media--portrait::after {
  padding-bottom: 125%;
}

.media--no-ratio::after {
  content: none;
}

.media--no-ratio {
  min-height: 220px;
}

.media__object {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media__label {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 1;
  padding: 3px 12px;
  border: 1px solid rgba(0, 255, 163, 0.35);
  border-radius: var(--radius-pill);
  background: rgba(10, 28, 46, 0.72);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-accent);
}

/* ---------- 15. 富文本与表格 ---------- */
.rtext {
  font-size: 16px;
  line-height: 1.95;
}

.rtext h2,
.rtext h3,
.rtext h4 {
  font-family: var(--font-head);
  color: var(--c-bg-main);
  line-height: 1.4;
  margin: 1.8em 0 0.6em;
}

.rtext h2 { font-size: 22px; }
.rtext h3 { font-size: 18px; }
.rtext h4 { font-size: 16px; }

.rtext p {
  margin-bottom: 1em;
}

.rtext ul,
.rtext ol {
  margin: 0 0 1.2em 1.4em;
  padding: 0;
}

.rtext ul { list-style: disc; }
.rtext ol { list-style: decimal; }

.rtext li {
  margin-bottom: 0.4em;
}

.rtext a {
  color: var(--c-bg-mid);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-color: rgba(0, 255, 163, 0.55);
  text-underline-offset: 4px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

.rtext a:hover {
  color: var(--c-accent);
  text-decoration-color: var(--c-accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--c-line);
}

th {
  font-family: var(--font-head);
  background: rgba(27, 79, 114, 0.08);
}

/* ---------- 16. 响应式 ---------- */
@media (max-width: 960px) {
  .grid {
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-3);
  }

  .g-col-12 { grid-column: 1 / -1; }
  .g-col-3,
  .g-col-4,
  .g-col-6 { grid-column: span 3; }
  .g-col-5,
  .g-col-7,
  .g-col-8,
  .g-col-9 { grid-column: span 6; }

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

@media (max-width: 900px) {
  .hdr__frame {
    padding: 8px 12px;
  }

  .hdr__nav {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 4px 12px 8px;
    background: transparent;
    border-top: none;
    border-bottom: none;
  }

  .hdr__toggle {
    align-self: flex-start;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border: 1px solid rgba(232, 240, 255, 0.25);
    border-radius: var(--radius-pill);
    background: rgba(232, 240, 255, 0.03);
    font-family: var(--font-head);
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-dark);
  }

  .hdr__toggle:hover {
    border-color: var(--c-accent);
    color: var(--c-accent);
  }

  .hdr__toggle-box {
    position: relative;
    display: block;
    width: 16px;
    height: 16px;
  }

  .hdr__toggle-line {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    background: currentColor;
    transition: transform var(--transition), opacity var(--transition);
  }

  .hdr__toggle-line:nth-child(1) { top: 3px; }
  .hdr__toggle-line:nth-child(2) { top: 7px; }
  .hdr__toggle-line:nth-child(3) { top: 11px; }

  .hdr__toggle[aria-expanded="true"] .hdr__toggle-line:nth-child(1) {
    transform: translateY(4px) rotate(45deg);
  }

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

  .hdr__toggle[aria-expanded="true"] .hdr__toggle-line:nth-child(3) {
    transform: translateY(-4px) rotate(-45deg);
  }

  .hdr__toggle-txt {
    display: inline-block;
  }

  .hdr__list {
    display: none;
    flex-direction: column;
    justify-content: flex-start;
    gap: 4px;
    padding: 4px 0 6px;
  }

  .hdr__nav[data-open="true"] {
    background: rgba(15, 45, 74, 0.85);
    border-bottom: 1px solid rgba(232, 240, 255, 0.14);
  }

  .hdr__nav[data-open="true"] .hdr__list {
    display: flex;
  }

  .hdr__link {
    width: 100%;
    border-radius: 12px;
  }
}

@media (max-width: 640px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hdr__status {
    padding: 5px;
    border-radius: 50%;
  }

  .hdr__status-txt {
    display: none;
  }

  .hdr__brand-badge {
    width: 32px;
    height: 32px;
    border-radius: 11px;
    font-size: 16px;
  }

  .hdr__brand-name {
    font-size: 14px;
  }

  .hdr__brand-sub {
    display: none;
  }

  .ftr__body {
    grid-template-columns: 1fr;
    padding-top: var(--space-4);
    padding-bottom: var(--space-4);
  }

  .ftr__meta {
    justify-content: center;
    text-align: center;
  }

  .ftr__conn {
    word-break: break-word;
  }

  .hero {
    padding: var(--space-4) 0;
  }

  .panel {
    padding: var(--space-3);
  }

  .back-top {
    right: 14px;
    bottom: 14px;
    padding: 8px 14px;
  }
}

/* ---------- 17. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}