:root {
  --navy: #0A1F44;
  --navy-deep: #060F2A;
  --orange: #FF6B00;
  --rock: #8A95A5;
  --moss: #5B8C5A;
  --terracotta: #C2571A;
  --cream: #F5F0E6;
  --obsidian: #111111;
  --white: #FFFFFF;

  --font-heading: 'Arial Black', Impact, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --container-width: 1280px;

  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 20px;
  --text-xl: 24px;
  --text-2xl: 28px;
  --text-3xl: 36px;
  --text-4xl: 48px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 80px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--navy);
  background: var(--cream);
  min-height: 100vh;
}

main {
  display: block;
}

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

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

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

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

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: var(--space-2xl) 0;
}

.section--tight {
  padding: var(--space-xl) 0;
}

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

.section-header {
  margin-bottom: var(--space-xl);
}

.section-title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: var(--text-3xl);
  line-height: 1.1;
  letter-spacing: -0.5px;
  color: var(--navy);
  margin-bottom: var(--space-sm);
}

.section--dark .section-title {
  color: var(--white);
}

.section-desc {
  font-size: var(--text-base);
  color: var(--rock);
  max-width: 640px;
}

.page-header {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--white);
  padding: var(--space-xl) 0 var(--space-xl);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
  margin-bottom: var(--space-xl);
}

.page-title {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: var(--text-3xl);
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--white);
}

.content-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.content-grid--reverse {
  grid-template-columns: 1fr 280px;
}

@media (max-width: 900px) {
  .content-grid,
  .content-grid--reverse {
    grid-template-columns: 1fr;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 24px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--white);
  background: var(--navy);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

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

.btn-primary:hover {
  background: #E85E00;
  border-color: #E85E00;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--navy);
  color: var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: var(--white);
}

.btn-quick {
  padding: 9px 18px;
  font-size: var(--text-sm);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-md);
}

.breadcrumb li {
  display: flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--rock);
}

.breadcrumb li + li::before {
  content: "›";
  margin: 0 8px;
  color: var(--rock);
  font-weight: 700;
}

.breadcrumb a {
  color: var(--rock);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

.tag-label {
  display: inline-flex;
  align-items: center;
  background: var(--orange);
  color: var(--white);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  padding: 6px 16px 6px 14px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.tag-label--muted {
  background: var(--rock);
}

.panel-cut {
  background: var(--white);
  border: 1px solid rgba(10, 31, 68, 0.08);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  padding: var(--space-xl);
}

.panel-cut--slash {
  background: var(--navy);
  color: var(--white);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 100%, 30px 100%);
  padding: var(--space-xl);
}

.img-wrap {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--rock);
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0,
    transparent 10px,
    rgba(255, 255, 255, 0.12) 10px,
    rgba(255, 255, 255, 0.12) 12px
  );
}

.img-wrap::before {
  content: "";
  display: block;
}

.img-wrap--16-9::before {
  padding-top: 56.25%;
}

.img-wrap--4-3::before {
  padding-top: 75%;
}

.img-wrap--portrait::before {
  padding-top: 133.3%;
}

.img-wrap > img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.data-highlight {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: var(--text-3xl);
  line-height: 1;
  color: var(--orange);
}

.text-muted {
  color: var(--rock);
}

.text-accent {
  color: var(--orange);
}

.lead {
  font-size: var(--text-lg);
  color: var(--navy);
  line-height: 1.7;
}

.bg-diagonal {
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.02) 0,
    rgba(255, 255, 255, 0.02) 1px,
    transparent 1px,
    transparent 14px
  );
}

.skip-link {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 9999;
  background: var(--orange);
  color: var(--white);
  padding: 10px 20px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  transform: translateY(-100%);
  transition: transform var(--transition-fast);
}

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

.site-header {
  background: var(--navy);
  color: var(--white);
  position: relative;
  z-index: 1000;
  border-bottom: 3px solid var(--orange);
}

.header-top {
  background: var(--navy-deep);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 8px 0;
}

.header-top-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.header-top-text {
  font-size: var(--text-xs);
  color: var(--cream);
  letter-spacing: 0.06em;
  margin: 0;
}

.header-top-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-xs);
  color: var(--rock);
  margin: 0;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--moss);
  flex-shrink: 0;
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(91, 140, 90, 0.6);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(91, 140, 90, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(91, 140, 90, 0);
  }
}

.header-main {
  position: relative;
  padding: 16px 0;
}

.header-main-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  background: var(--orange);
  color: var(--white);
  font-family: var(--font-heading);
  font-weight: 900;
  font-style: italic;
  font-size: 18px;
  line-height: 1;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  flex-shrink: 0;
}

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

.brand-name {
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: -0.5px;
  color: var(--white);
}

.brand-slogan {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--rock);
}

.header-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 200;
  display: none;
  padding: 8px 24px 16px;
  background: var(--navy-deep);
  border-top: 2px solid var(--orange);
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.35);
}

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

.nav-list {
  display: flex;
  flex-direction: column;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 14px 0;
  color: var(--white);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: color var(--transition-fast);
}

.nav-list li:last-child .nav-link {
  border-bottom: none;
}

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

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

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  transition: transform var(--transition-base), opacity var(--transition-fast), background var(--transition-fast);
}

.nav-toggle:hover .nav-toggle-bar {
  background: var(--orange);
}

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

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

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

@media (min-width: 1025px) {
  .header-nav {
    position: static;
    display: block;
    margin-left: auto;
    padding: 0;
    background: transparent;
    border: none;
    box-shadow: none;
  }

  .nav-list {
    flex-direction: row;
    gap: 28px;
  }

  .nav-link {
    position: relative;
    padding: 8px 0;
    border: none;
    font-size: 15px;
  }

  .nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 3px;
    background: var(--orange);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
  }

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

  .header-actions {
    margin-left: 16px;
  }

  .nav-toggle {
    display: none;
  }
}

.site-footer {
  background: var(--obsidian);
  color: var(--rock);
  border-top: 4px solid var(--orange);
  padding-top: 56px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand-col,
.footer-links-col,
.footer-contact-col {
  min-width: 0;
}

.footer-brand {
  display: inline-block;
  font-family: var(--font-heading);
  font-style: italic;
  font-weight: 900;
  font-size: var(--text-2xl);
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.5px;
  padding-bottom: 6px;
  border-bottom: 3px solid var(--orange);
  margin-bottom: 16px;
}

.footer-desc {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--rock);
  margin-top: 16px;
}

.footer-heading {
  font-family: var(--font-heading);
  font-style: italic;
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: var(--rock);
  font-size: var(--text-sm);
  text-decoration: none;
  display: inline-block;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 4px;
}

.footer-contact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: var(--text-sm);
  color: var(--rock);
  margin-bottom: 12px;
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--rock);
  opacity: 0.8;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: var(--rock);
}

.footer-icp {
  letter-spacing: 0.05em;
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .header-main {
    padding: 12px 0;
  }

  .header-main-inner {
    gap: 10px;
  }

  .brand {
    gap: 8px;
  }

  .brand-mark {
    width: 42px;
    height: 42px;
    font-size: 15px;
  }

  .brand-name {
    font-size: 20px;
  }

  .brand-slogan {
    display: none;
  }

  .btn-quick {
    padding: 8px 12px;
    font-size: 13px;
  }

  .header-actions {
    gap: 8px;
  }

  .header-top-status {
    display: none;
  }
}

.tabs {
  margin-top: var(--space-lg);
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 2px solid rgba(10, 31, 68, 0.12);
}

.tab-btn {
  appearance: none;
  background: transparent;
  border: none;
  padding: 12px 24px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  font-style: italic;
  color: var(--navy);
  cursor: pointer;
  position: relative;
  border-radius: 0;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.tab-btn::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

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

.tab-btn[aria-selected="true"],
.tab-btn[data-active] {
  color: var(--navy);
  background: rgba(10, 31, 68, 0.04);
}

.tab-btn[aria-selected="true"]::after,
.tab-btn[data-active]::after {
  transform: scaleX(1);
}

.tab-panel {
  padding-top: var(--space-lg);
}

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

.tab-panel[data-active] {
  animation: tabFade 250ms ease;
}

@keyframes tabFade {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@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;
  }

  .status-dot {
    animation: none;
  }

  .tab-panel[data-active] {
    animation: none;
  }

  .btn:hover {
    transform: none;
  }
}