:root {
  --c-deep: #0A2540;
  --c-deep-2: #0B3B6E;
  --c-orange: #FF5A00;
  --c-orange-light: #FFE8D9;
  --c-white: #FFFFFF;
  --c-pale: #F9FAFB;
  --c-graphite: #2D3748;
  --c-fog: #A0AEC0;
  --c-line: #E2E8F0;
  --c-teal: #00A3A3;
  --font-heading: 'Rajdhani', 'PingFang SC', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', sans-serif;
  --container: 1320px;
  --side-width: 320px;
  --header-height: 76px;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 10px 24px rgba(10, 37, 64, 0.08);
  --shadow-md: 0 18px 40px rgba(10, 37, 64, 0.12);
  --ease-out: 0.2s ease-out;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-graphite);
  background: var(--c-pale);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-deep);
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-deep);
  text-decoration: none;
  transition: color var(--ease-out);
}

a:hover,
a:focus-visible {
  color: var(--c-orange);
}

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

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

::selection {
  background: var(--c-orange);
  color: var(--c-deep);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 3000;
  background: var(--c-orange);
  color: var(--c-deep);
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-height) + 16px);
}

/* ----- 头部 ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  min-height: var(--header-height);
  background: linear-gradient(105deg, rgba(255, 90, 0, 0.24) 0%, rgba(255, 90, 0, 0) 200px), var(--c-deep);
  color: #fff;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(104deg, var(--c-orange) 0 32%, #fff 32.2% 32.6%, transparent 32.8%);
  pointer-events: none;
}

.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 4;
  background: rgba(255, 255, 255, 0.16);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.header-inner {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
  min-height: var(--header-height);
}

.header-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  padding: 12px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: #fff;
}

.brand:hover {
  color: #fff;
}

.brand-mark {
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.03em;
  color: #fff;
}

.brand-sub {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.2;
  white-space: nowrap;
}

.header-nav-area {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-item {
  margin: 0;
}

.nav-link {
  position: relative;
  display: block;
  padding: 10px 12px;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  line-height: 1.4;
  border-radius: 4px;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: var(--c-orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ease-out);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #fff;
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: #fff;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
}

.nav-toggle-icon {
  display: block;
  width: 18px;
  height: 14px;
  position: relative;
}

.nav-toggle-icon span {
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--ease-out), opacity var(--ease-out), top var(--ease-out);
}

.nav-toggle-icon span:nth-child(1) {
  top: 0;
}

.nav-toggle-icon span:nth-child(2) {
  top: 6px;
}

.nav-toggle-icon span:nth-child(3) {
  top: 12px;
}

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

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

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

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.03em;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  padding: 14px 24px;
  transition: background var(--ease-out), color var(--ease-out), border-color var(--ease-out), transform var(--ease-out);
}

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

.btn-cta {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: var(--c-deep);
}

.btn-cta:hover,
.btn-cta:focus-visible {
  background: var(--c-white);
  border-color: var(--c-white);
  color: var(--c-deep);
  transform: translateY(-2px);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--c-deep);
  border-color: var(--c-deep);
  color: #fff;
}

.btn-cta-nav {
  padding: 10px 18px;
  font-size: 15px;
  white-space: nowrap;
}

/* ----- 页脚 ----- */
.site-footer {
  position: relative;
  background: linear-gradient(285deg, rgba(255, 90, 0, 0.14) 0%, rgba(255, 90, 0, 0) 240px), var(--c-deep);
  color: rgba(255, 255, 255, 0.85);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  height: 4px;
  width: 100%;
  background: linear-gradient(104deg, var(--c-orange) 0 24%, rgba(255, 255, 255, 0.55) 24.2% 24.6%, transparent 24.8%);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px 32px 32px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.5fr 1.1fr 0.8fr;
  gap: 56px;
}

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

.footer-brand-link {
  display: flex;
  align-items: center;
  gap: 14px;
  color: #fff;
  margin-bottom: 20px;
}

.footer-brand-svg {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
}

.footer-brand-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
  color: #fff;
}

.footer-brand-sub {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(255, 255, 255, 0.6);
}

.footer-trust {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 12px;
  max-width: 46ch;
}

.footer-note {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  max-width: 48ch;
  margin: 0;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 4px 0 18px;
}

.footer-address {
  display: grid;
  gap: 8px;
  font-style: normal;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
}

.footer-service {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
}

.footer-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.footer-link-list a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  padding: 4px 0;
  display: inline-block;
}

.footer-link-list a:hover,
.footer-link-list a:focus-visible {
  color: var(--c-orange);
}

.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  text-align: center;
}

.footer-copy {
  margin: 0;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

/* ----- 通用布局 ----- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 80px 0;
}

.section-kicker {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-orange);
  margin: 0 0 8px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  margin: 0 0 16px;
}

.section-description {
  max-width: 64ch;
  color: var(--c-graphite);
  margin: 0;
}

.grid-2,
.grid-3,
.grid-12 {
  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-12 {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--side-width)) minmax(0, 1fr);
  gap: 0;
  align-items: start;
}

.split-aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  align-self: start;
  background: var(--c-deep);
  color: #fff;
  padding: 32px;
  border-radius: var(--radius);
}

.split-aside .split-title {
  color: #fff;
}

.split-content {
  min-width: 0;
}

/* ----- 卡片与面板 ----- */
.card {
  position: relative;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease-out), box-shadow var(--ease-out);
}

.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-orange);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform var(--ease-out);
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card:hover::before,
.card:focus-within::before {
  transform: scaleY(1);
}

.card-heading {
  font-size: 20px;
  margin-bottom: 8px;
}

.card-body {
  margin: 0;
  font-size: 15px;
  color: var(--c-graphite);
  line-height: 1.7;
}

.glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 20px 50px rgba(10, 37, 64, 0.15);
}

.panel {
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--c-pale);
  color: var(--c-deep);
  border: 1px solid transparent;
  white-space: nowrap;
}

.tag-orange {
  background: var(--c-orange-light);
  color: #B34700;
}

.tag-navy {
  background: var(--c-deep);
  color: #fff;
}

.tag-green {
  background: #E0F2F2;
  color: #006F6F;
}

/* ----- 数据组件 ----- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
  color: var(--c-deep);
}

.stat-label {
  font-size: 13px;
  color: var(--c-fog);
  letter-spacing: 0.06em;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--c-white);
  font-size: 15px;
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
}

.data-table th {
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-deep);
  background: var(--c-pale);
}

.data-table tr:hover td {
  background: var(--c-orange-light);
}

/* ----- 常见页面工具 ----- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  margin: 0 0 24px;
  list-style: none;
  font-size: 14px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--c-fog);
  margin-right: 8px;
}

.breadcrumbs a {
  color: var(--c-deep);
}

.breadcrumbs [aria-current="page"] {
  color: var(--c-orange);
  font-weight: 600;
}

.page-header {
  padding: 56px 0 24px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 48px;
}

.page-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  margin: 0 0 8px;
}

.page-description {
  max-width: 65ch;
  color: var(--c-graphite);
  font-size: 18px;
  margin: 0;
}

.prose {
  max-width: 76ch;
}

.prose h2 {
  font-size: 28px;
  margin-top: 2em;
}

.prose h3 {
  font-size: 20px;
}

.prose p {
  margin-bottom: 1.2em;
}

.prose a {
  color: var(--c-orange);
  text-decoration: underline;
}

/* ----- FAQ ----- */
.faq-item {
  border-bottom: 1px solid var(--c-line);
}

.faq-item[open] .faq-summary {
  color: var(--c-orange);
}

.faq-summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  cursor: pointer;
  padding: 18px 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--c-deep);
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "+";
  font-size: 22px;
  line-height: 1;
  flex: 0 0 auto;
  color: var(--c-orange);
}

.faq-item[open] .faq-summary::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 0 20px;
  color: var(--c-graphite);
  line-height: 1.8;
}

/* ----- 纯 CSS 图片容器 ----- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius);
  background-color: var(--c-deep-2);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.18) 0, transparent 45%),
    linear-gradient(135deg, transparent 0 68%, rgba(255, 90, 0, 0.22) 68% 80%, transparent 80%);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.media-frame::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.media-frame-4-3::before {
  padding-top: 75%;
}

.media-frame-1-1::before {
  padding-top: 100%;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 4px;
  width: 100%;
  background: var(--c-orange);
  transform: scaleX(0.25);
  transform-origin: left;
  transition: transform 0.25s ease-out;
}

.media-frame:hover::after {
  transform: scaleX(1);
}

/* ----- 响应式 ----- */
@media (max-width: 1100px) {
  .header-nav-area {
    gap: 16px;
  }

  .nav-link {
    padding: 10px 8px;
  }

  .nav-link::after {
    left: 8px;
    right: 8px;
  }

  .footer-cols {
    gap: 32px;
  }
}

@media (max-width: 960px) {
  :root {
    --header-height: 64px;
  }

  .site-header {
    min-height: var(--header-height);
  }

  .header-inner {
    min-height: var(--header-height);
    padding: 0 20px;
  }

  .header-nav-area {
    gap: 12px;
  }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: linear-gradient(105deg, rgba(255, 90, 0, 0.2), transparent 180px), var(--c-deep);
    padding: 0 24px 24px;
    box-shadow: 0 24px 40px rgba(10, 37, 64, 0.35);
    max-height: calc(100vh - var(--header-height));
    overflow: auto;
  }

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

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

  .nav-link {
    padding: 14px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.88);
    font-size: 16px;
  }

  .nav-link::after {
    bottom: 8px;
  }

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

  .split-layout {
    grid-template-columns: 1fr;
  }

  .split-aside {
    position: static;
  }

  .section {
    padding: 56px 0;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  .brand {
    gap: 10px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand-name {
    font-size: 22px;
  }

  .brand-sub {
    display: none;
  }

  .btn-cta-nav {
    padding: 9px 14px;
    font-size: 14px;
  }

  .nav-toggle {
    width: 42px;
    height: 42px;
  }

  .container {
    padding: 0 20px;
  }

  .footer-inner {
    padding: 48px 20px 24px;
  }

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

  .footer-bottom {
    margin-top: 32px;
  }

  .grid-2,
  .grid-3,
  .grid-12 {
    grid-template-columns: 1fr;
  }

  .page-header {
    padding: 40px 0 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .card:hover,
  .btn:hover,
  .btn-cta:hover {
    transform: none;
  }
}