/* ==========================================================================
   开运KAIYUN — Site Kit 共享样式
   ========================================================================== */

/* ---------- CSS 变量 ---------- */
:root {
  --blue-900: #0A1F44;
  --blue-800: #122A54;
  --blue-700: #1A3A66;
  --blue-600: #2A4A78;
  --orange: #FF6B35;
  --yellow: #FFD700;
  --white: #FFFFFF;
  --slate: #B8C6D6;
  --green: #4CAF50;
  --red: #E53935;

  --font-heading: 'Oswald', 'Arial Narrow', 'Noto Sans SC', 'Microsoft Yahei', sans-serif;
  --font-body: 'Source Han Sans SC', 'Noto Sans SC', 'Microsoft Yahei', 'PingFang SC', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', 'Consolas', 'Courier New', monospace;

  --rail-width: clamp(248px, 22vw, 320px);
  --content-max: 1280px;
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-card: 6px 6px 0 rgba(0, 0, 0, 0.18);
  --shadow-hard: 10px 10px 0 rgba(0, 0, 0, 0.32);
}

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

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

body {
  margin: 0;
  background-color: var(--blue-900);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  margin: 0 0 1rem;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0 0 1.5rem;
  text-wrap: pretty;
}

a {
  color: var(--orange);
  text-underline-offset: 3px;
}

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

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

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

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
}

::selection {
  background: var(--orange);
  color: var(--blue-900);
}

:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

hr {
  margin: 2rem 0;
  border: none;
  border-top: 2px solid var(--blue-600);
}

/* ---------- 布局骨架 ---------- */
.main-content {
  margin-left: var(--rail-width);
  min-height: 70vh;
}

.site-footer {
  margin-left: var(--rail-width);
}

.content-wrap {
  width: min(100% - clamp(1.5rem, 6vw, 4rem), var(--content-max));
  margin-inline: auto;
}

[id] {
  scroll-margin-top: 5rem;
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: -100%;
  left: 0;
  z-index: 1100;
  padding: 0.75rem 1.5rem;
  background: var(--yellow);
  color: var(--blue-900);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
  transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  top: 0;
  color: var(--blue-900);
  outline: none;
}

/* ---------- 阅读进度 ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1000;
  pointer-events: none;
  background: rgba(10, 31, 68, 0.45);
}

.progress-fill {
  position: relative;
  display: block;
  height: 100%;
  width: 0;
  background: var(--orange);
  transition: width 60ms linear;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(6px, 1vw, 14px);
  height: 100%;
  background: var(--yellow);
}

/* ---------- 站点头部：侧边轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-width);
  z-index: 900;
  background-color: var(--blue-800);
  background-image:
    linear-gradient(rgba(42, 74, 120, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 120, 0.22) 1px, transparent 1px);
  background-size: 28px 28px;
  border-right: none;
  transition: box-shadow var(--duration-base) var(--ease-out);
}

.site-header::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background: repeating-linear-gradient(
    to bottom,
    var(--blue-600) 0px,
    var(--blue-600) 2px,
    transparent 2px,
    transparent 8px
  );
  pointer-events: none;
}

.header-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  padding: clamp(1.25rem, 2.5vw, 2rem);
  gap: clamp(1.25rem, 2vh, 2rem);
  overflow-y: auto;
  overflow-x: hidden;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  color: var(--white);
  text-decoration: none;
  padding-bottom: clamp(1rem, 2vh, 1.5rem);
  border-bottom: 1px solid var(--blue-600);
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  background: var(--orange);
  color: var(--blue-900);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.25);
}

.brand-copy {
  display: grid;
  gap: 0.125rem;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.15;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--slate);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.4;
}

/* 移动导航开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.625rem;
  margin-left: auto;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--blue-600);
  color: var(--white);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle-bars i {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--duration-fast) var(--ease-out), opacity var(--duration-fast) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 主导航 */
.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.nav-overline {
  display: block;
  margin-bottom: 0.875rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--blue-600);
  text-transform: uppercase;
}

.nav-list {
  display: grid;
  gap: 0.125rem;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  color: var(--slate);
  font-weight: 500;
  font-size: 0.9375rem;
  text-decoration: none;
  border-left: 3px solid transparent;
  background: transparent;
  transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), padding-left var(--duration-fast) var(--ease-out);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--blue-600);
  min-width: 1.5em;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav-label {
  letter-spacing: 0.03em;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--white);
  padding-left: 1rem;
}

.nav-link:hover .nav-num {
  color: var(--orange);
}

.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 107, 53, 0.1), transparent 80%);
  border-left-color: var(--orange);
  color: var(--white);
  padding-left: 1rem;
}

.nav-link[aria-current="page"] .nav-num {
  color: var(--orange);
}

/* 导航底部命令块 */
.rail-bottom {
  margin-top: auto;
  padding-top: 1.25rem;
  border-top: 1px solid var(--blue-600);
  display: grid;
  gap: 1rem;
}

.rail-code {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--blue-600);
  text-transform: uppercase;
}

.rail-code span + span::before {
  content: '/';
  margin-right: 0.75rem;
  color: var(--blue-600);
}

.rail-status {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
  animation: status-pulse 2s ease-out infinite;
}

@keyframes status-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
  }

  50% {
    box-shadow: 0 0 0 6px rgba(76, 175, 80, 0.08);
  }
}

/* ---------- 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6875rem 1.25rem;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
  color: var(--white);
  background: transparent;
  border: 2px solid var(--blue-600);
  transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

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

.btn:active {
  transform: translateY(2px);
}

.btn-cta {
  color: var(--blue-900);
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.3);
}

.btn-cta::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 14px;
  height: 14px;
  background: var(--blue-900);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.btn-cta:hover {
  background: var(--yellow);
  border-color: var(--yellow);
  color: var(--blue-900);
}

.btn-label,
.btn-arrow {
  position: relative;
  z-index: 1;
}

.btn-arrow {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover .btn-arrow {
  transform: translate(2px, -2px);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--blue-800);
  border-top: 2px solid var(--blue-600);
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1.5rem, 5vw, 4.5rem) 2rem;
}

.footer-inner {
  max-width: calc(var(--content-max) + var(--rail-width));
  margin-inline: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

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

.footer-block-brand {
  grid-column: span 5;
}

.footer-block-contact {
  grid-column: span 4;
}

.footer-block-links {
  grid-column: span 3;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--white);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.625rem;
}

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

.footer-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--orange);
  color: var(--blue-900);
  font-size: 1rem;
  line-height: 1;
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 7px 100%, 0 calc(100% - 7px));
}

.footer-brand-name {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.footer-tagline {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 1.25rem;
}

.footer-about,
.footer-trust {
  color: var(--slate);
  font-size: 0.9375rem;
  max-width: 34em;
}

.footer-trust {
  position: relative;
  padding-top: 1rem;
  border-top: 1px solid var(--blue-600);
  font-size: 0.875rem;
  color: var(--blue-600);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--blue-600);
  position: relative;
}

.footer-heading::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 2.5rem;
  height: 2px;
  background: var(--orange);
}

.heading-index {
  display: inline-block;
  margin-right: 0.5rem;
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.footer-list {
  display: grid;
  gap: 0.875rem;
}

.footer-contact-item {
  display: grid;
  gap: 0.125rem;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--blue-600);
}

.footer-value {
  color: var(--white);
  font-size: 0.9375rem;
  word-break: break-all;
}

.footer-note {
  margin-top: 0.75rem;
  padding-top: 0.875rem;
  border-top: 1px dashed var(--blue-600);
  font-size: 0.8125rem;
  color: var(--slate);
  line-height: 1.6;
}

.footer-link-list {
  gap: 0.375rem;
}

.footer-link-list a {
  display: inline-block;
  padding: 0.375rem 0;
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--ease-out), border-bottom-color var(--duration-fast) var(--ease-out);
}

.footer-link-list a:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 2rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--blue-600);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--blue-600);
}

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

.footer-route {
  margin-left: auto;
  letter-spacing: 0.08em;
}

/* ---------- 栅格与面包屑 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2.5vw, 2rem);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 2rem;
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.875rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb li + li::before {
  content: '/';
  color: var(--blue-600);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--slate);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--orange);
}

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

/* ---------- 章节题头 ---------- */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 0.875rem;
  margin-bottom: 2rem;
}

.section-head-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--orange);
}

.section-head h1,
.section-head h2,
.section-head h3 {
  margin: 0;
}

/* ---------- 数据卡片 ---------- */
.data-card {
  background: var(--blue-700);
  border: 2px solid var(--blue-600);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
  transition: border-color var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}

.data-card:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.data-card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.data-card-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--orange);
  line-height: 1.2;
}

.data-card-meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--slate);
}

/* ---------- 图片框 ---------- */
.img-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--blue-700);
  background-image:
    linear-gradient(rgba(42, 74, 120, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 120, 0.3) 1px, transparent 1px);
  background-size: 20px 20px;
  border: 2px solid var(--blue-600);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

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

.img-frame[data-count]::before {
  content: attr(data-count);
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  z-index: 2;
  padding: 0.25rem 0.625rem;
  background: var(--blue-900);
  border: 2px solid var(--orange);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
}

.img-frame[data-caption]::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  max-width: 80%;
  padding: 0.25rem 0.75rem;
  background: var(--orange);
  color: var(--blue-900);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- 选项卡 ---------- */
[data-tabs] {
  margin-bottom: 2rem;
}

.tabs-nav {
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  border-bottom: 2px solid var(--blue-600);
}

.tabs-nav button {
  appearance: none;
  -webkit-appearance: none;
  padding: 0.625rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}

.tabs-nav button:hover {
  color: var(--white);
  background: rgba(255, 255, 255, 0.04);
}

.tabs-nav button[aria-selected="true"] {
  color: var(--orange);
  border-bottom-color: var(--orange);
  background: linear-gradient(0deg, rgba(255, 107, 53, 0.08), transparent 70%);
}

.tabs-panel {
  padding: 1.5rem;
  background: var(--blue-800);
  border: 2px solid var(--blue-600);
  border-top: none;
}

.tabs-panel[hidden] {
  display: none;
}

/* ---------- 章节高亮导航 ---------- */
.spy-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}

.spy-nav a {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--blue-600);
  background: var(--blue-800);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  transition: color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.spy-nav a:hover {
  color: var(--white);
  border-color: var(--orange);
}

.spy-nav a.is-spy-active,
.spy-nav a[aria-current="location"] {
  color: var(--blue-900);
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.3);
}

/* ---------- 滚动显现 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.js-ready [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式：1024px 以下（移动 / 平板竖屏） ---------- */
@media (min-width: 1024px) {
  .skip-link {
    left: var(--rail-width);
  }

  .reading-progress {
    left: var(--rail-width);
  }
}

@media (max-width: 1023px) {
  .site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 2px solid var(--blue-600);
    background-color: var(--blue-800);
  }

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

  .site-header[data-scrolled] {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
  }

  .header-inner {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    height: auto;
    padding: 0.75rem 1.25rem;
    gap: 0;
    overflow: visible;
  }

  .brand {
    padding-bottom: 0;
    border-bottom: none;
  }

  .brand-mark {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-tag {
    display: none;
  }

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

  .site-nav {
    display: none;
    flex: 0 1 100%;
    order: 5;
    flex-direction: column;
    gap: 1rem;
    margin: 0.75rem -1.25rem -0.75rem;
    padding: 1.25rem;
    background-color: var(--blue-800);
    border-top: 1px solid var(--blue-600);
  }

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

  .nav-overline {
    margin-bottom: 0.5rem;
  }

  .nav-list {
    gap: 0.25rem;
  }

  .nav-link {
    padding: 0.75rem;
  }

  .rail-bottom {
    margin-top: 0.25rem;
  }

  .main-content,
  .site-footer {
    margin-left: 0;
  }

  .site-footer {
    padding: 2.5rem 1.25rem 1.5rem;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-block-contact,
  .footer-block-links {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-block-brand,
  .footer-block-contact,
  .footer-block-links {
    grid-column: 1 / -1;
  }

  .footer-route {
    width: 100%;
    margin-left: 0;
  }
}

@media (max-width: 360px) {
  .nav-toggle-text {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }
}

/* ---------- 减少动态偏好 ---------- */
@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;
  }

  .js-ready [data-reveal],
  .js-ready [data-reveal][data-revealed] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .data-card:hover,
  .btn:active,
  .btn:hover .btn-arrow {
    transform: none;
  }
}