:root {
  --color-primary: #0A1F44;
  --color-secondary-teal: #0F4C5C;
  --color-accent-orange: #FF6B35;
  --color-orange-light: #FFD9C7;
  --color-metal-gray: #C0C0C0;
  --color-paper: #F5F7FA;
  --color-white: #FFFFFF;
  --color-ink: #111827;
  --color-muted: #6B7280;
  --color-wine: #722F37;

  --font-title: 'Archivo Black', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --font-data: 'Roboto Mono', 'SFMono-Regular', monospace;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --shadow-sm: 0 2px 8px rgba(10, 31, 68, 0.08);
  --shadow-md: 0 8px 24px rgba(10, 31, 68, 0.12);
  --shadow-lg: 0 16px 40px rgba(10, 31, 68, 0.18);
  --shadow-orange: 0 8px 24px rgba(255, 107, 53, 0.24);

  --transition-fast: 200ms ease-out;
  --transition-base: 300ms ease-out;
  --transition-slow: 600ms ease-out;

  --site-max-width: 1200px;
  --header-height: 132px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-paper);
  overflow-x: hidden;
}

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

img {
  height: auto;
}

a {
  color: var(--color-accent-orange);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

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

::selection {
  background: var(--color-accent-orange);
  color: var(--color-white);
}

.wrap {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 9999;
  background: var(--color-accent-orange);
  color: var(--color-white);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.875rem;
  transform: translateY(-200%);
  transition: transform var(--transition-base);
}

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

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-orange) 0%, #ffb347 100%);
  z-index: 1001;
  border-radius: 0 4px 4px 0;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  color: var(--color-white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px rgba(10, 31, 68, 0.3);
}

.site-header__spacer {
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-orange) 0%, var(--color-secondary-teal) 50%, var(--color-wine) 100%);
}

.site-header__inner {
  padding-top: 14px;
  padding-bottom: 14px;
  transition: padding var(--transition-base);
}

.site-header__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.site-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  color: var(--color-white);
  min-width: 0;
}

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

.site-logo {
  font-family: var(--font-title);
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  color: var(--color-white);
  background: linear-gradient(90deg, #ff8a5c 0%, var(--color-accent-orange) 80%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  position: relative;
}

.site-title {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-metal-gray);
  letter-spacing: 0.1em;
  white-space: nowrap;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  padding-left: 14px;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-orange);
  color: var(--color-white) !important;
  font-weight: 700;
  font-size: 0.9375rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-orange);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  line-height: 1.4;
}

.cta-button:hover {
  transform: translateY(-2px);
  background: #ff5420;
  box-shadow: 0 12px 28px rgba(255, 107, 53, 0.35);
  color: var(--color-white) !important;
}

.cta-button--compact {
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  padding: 10px;
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.16);
}

.nav-toggle__line {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[data-open="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[data-open="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[data-open="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.site-nav a {
  color: rgba(255, 255, 255, 0.78);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  border: 1px solid transparent;
  letter-spacing: 0.01em;
}

.site-nav a:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.site-nav a[aria-current="page"] {
  color: var(--color-primary);
  background: var(--color-orange-light);
  border-color: var(--color-accent-orange);
  font-weight: 600;
}

.site-nav .site-nav__cta {
  margin-left: auto;
  color: var(--color-white);
  background: rgba(255, 107, 53, 0.2);
  border-color: rgba(255, 107, 53, 0.6);
}

.site-nav .site-nav__cta:hover {
  background: var(--color-accent-orange);
  border-color: var(--color-accent-orange);
  color: var(--color-white);
}

.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.9375rem;
  margin-top: auto;
  border-top: 4px solid var(--color-accent-orange);
}

.site-footer__content {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 48px;
  padding-top: 56px;
  padding-bottom: 48px;
}

.site-footer__brand {
  max-width: 380px;
}

.site-footer__logo {
  font-family: var(--font-title);
  font-size: 1.6rem;
  letter-spacing: 0.05em;
  background: linear-gradient(90deg, #ff8a5c, var(--color-accent-orange));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.site-footer__slogan {
  margin-top: 14px;
  font-size: 1.1rem;
  color: var(--color-white);
  font-weight: 600;
  border-left: 3px solid var(--color-accent-orange);
  padding-left: 14px;
}

.site-footer__trust {
  margin-top: 18px;
  color: var(--color-metal-gray);
  line-height: 1.7;
  font-size: 0.875rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.site-footer__heading {
  font-family: var(--font-title);
  color: var(--color-white);
  font-size: 1rem;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.9rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  padding-left: 0;
}

.footer-links a:hover {
  color: var(--color-accent-orange);
  padding-left: 6px;
}

.footer-contact {
  color: rgba(255, 255, 255, 0.74);
  line-height: 1.8;
  font-size: 0.875rem;
  word-break: break-word;
}

.site-footer__meta {
  background: rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 22px;
  padding-bottom: 22px;
}

.site-footer__meta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.8125rem;
}

.site-footer__disclaimer {
  flex-basis: 100%;
  color: var(--color-metal-gray);
  border-top: 1px dashed rgba(255, 255, 255, 0.18);
  padding-top: 14px;
  margin-top: 6px;
  font-size: 0.8125rem;
}

/* 通用布局与章节 */
.page-hero-ready {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px 40px;
  border-radius: var(--radius-lg);
  background: var(--color-white);
  box-shadow: var(--shadow-md);
  min-height: 280px;
  margin-bottom: 48px;
  position: relative;
  overflow: hidden;
}

.page-hero-ready::before {
  content: "";
  position: absolute;
  right: -80px;
  top: -80px;
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, var(--color-orange-light), transparent);
  border-radius: 50%;
  opacity: 0.5;
}

.section-depth {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  margin: 40px 0;
}

.section-depth--teal {
  background: var(--color-secondary-teal);
}

.section-depth--wine {
  background: var(--color-wine);
}

.section-paper {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
}

.content-column {
  max-width: 70ch;
  margin: 0 auto;
  padding: 0 24px;
}

.content-column p {
  margin-bottom: 1.2em;
}

.giant-index {
  font-family: var(--font-data);
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 700;
  color: var(--color-accent-orange);
  line-height: 1;
  opacity: 0.8;
  letter-spacing: -0.04em;
}

.giant-index--static {
  font-size: clamp(2.4rem, 6vw, 5rem);
}

.data-line {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-metal-gray);
}

.data-line__label {
  font-family: var(--font-data);
  font-size: 0.875rem;
  color: var(--color-muted);
  min-width: 80px;
}

.data-line__value {
  font-family: var(--font-data);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
  margin: 24px 0;
}

.card-item {
  background: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-orange);
}

.card-item__title {
  font-family: var(--font-title);
  color: var(--color-primary);
  margin-bottom: 12px;
  font-size: 1.125rem;
}

.card-item__content {
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.num-data {
  font-family: var(--font-data);
  color: var(--color-accent-orange);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

/* 通用按钮 / 链接 */
.text-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-primary);
  font-weight: 600;
}

.text-button::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.text-button:hover::after {
  transform: translateX(4px);
}

/* 图片容器基础规则 */
.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  aspect-ratio: 16 / 10;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
}

.image-frame .image-frame__placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary-teal) 50%, var(--color-accent-orange) 100%);
  opacity: 0.6;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-family: var(--font-data);
  font-size: 0.875rem;
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-frame--tall {
  aspect-ratio: 4 / 5;
}

/* 表格、标签、引用可复用 */
.simple-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.simple-table th,
.simple-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-paper);
}

.simple-table th {
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  font-family: var(--font-data);
  font-size: 0.875rem;
}

.simple-table td {
  color: var(--color-ink);
  font-family: var(--font-data);
  font-size: 0.875rem;
}

.tag-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-orange-light);
  color: var(--color-primary);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
}

.tag-line::before {
  content: "●";
  color: var(--color-accent-orange);
  font-size: 0.625rem;
}

@media (max-width: 900px) {
  .site-footer__content {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
    padding-bottom: 36px;
  }

  .site-footer__grid {
    gap: 24px;
  }

  .site-header__inner {
    padding-top: 10px;
    padding-bottom: 10px;
    overflow-y: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: grid;
    position: fixed;
    top: var(--header-stop, 84px);
    left: 0;
    right: 0;
    background: var(--color-primary);
    padding: 20px 24px 28px;
    gap: 8px;
    border-radius: 0 0 24px 24px;
    box-shadow: 0 24px 64px rgba(10, 31, 68, 0.45);
    margin-top: 0;
    border-top: none;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base);
    z-index: 999;
    max-height: calc(100vh - 90px);
    overflow-y: auto;
  }

  .site-nav[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav .site-nav__cta {
    margin-left: 0;
  }

  .site-nav a {
    padding: 12px 16px;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
  }

  .site-header::after {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(10, 31, 68, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 998;
  }

  .site-header[data-nav-open="true"]::after {
    opacity: 1;
    pointer-events: auto;
  }
}

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

  .site-title {
    display: none;
  }

  .site-logo {
    font-size: 1.2rem;
  }

  .site-header__actions {
    gap: 8px;
  }

  .cta-button--compact {
    padding: 0.4rem 0.8rem;
    font-size: 0.8125rem;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .site-footer__content {
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 32px;
  }

  .site-footer__heading {
    margin-bottom: 10px;
  }

  .page-hero-ready {
    min-height: 220px;
    padding: 24px;
  }

  .section-paper,
  .section-depth {
    padding: 24px 20px;
    border-radius: 16px;
  }

  :root {
    --header-height: 58px;
  }
}

@media (min-width: 640px) {
  .site-nav a[aria-current="page"] {
    background: var(--color-orange-light);
  }
}

@media (max-width: 640px) {
  .site-nav a[aria-current="page"] {
    color: var(--color-orange-light);
    background: transparent;
    border-left: 3px solid var(--color-orange-light);
  }
}

@media (max-width: 640px) {
  .site-header {
    position: fixed;
    width: 100%;
  }

  body {
    padding-top: 58px;
  }
}

@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;
  }

  .progress-bar {
    display: none;
  }

  .site-nav,
  .nav-toggle__line {
    transition: none;
  }
}