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

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

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}

h1, h2, h3, h4, p, ul, ol, dl, dd, figure, blockquote {
  margin: 0;
}

ul, ol {
  padding: 0;
}

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

a {
  color: var(--c-secondary);
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

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

button {
  font: inherit;
  cursor: pointer;
}

address {
  font-style: normal;
}

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

::selection {
  background: var(--c-primary);
  color: #fff;
}

:root {
  --c-primary: #E63946;
  --c-secondary: #2A9DF4;
  --c-highlight: #FFC940;
  --c-bg: #F5F6F8;
  --c-surface: #FFFFFF;
  --c-text: #1A1A1A;
  --c-muted: #6B7280;
  --c-border: #D1D5DB;
  --c-red-light: #FDECEC;
  --c-blue-light: #E8F4FD;
  --c-gold-light: #FFF6D6;
  --c-success: #10B981;
  --font-headline: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Open Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Consolas, monospace;
  --container: 1240px;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
}

#main-content {
  display: block;
  scroll-margin-top: 130px;
  outline: none;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--c-primary);
  color: #fff;
  padding: 10px 16px;
  font-weight: 700;
}

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

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.page-container {
  max-width: var(--container);
  margin-inline: auto;
  padding: 40px 24px 72px;
}

.section {
  margin-top: 64px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  border-left: 5px solid var(--c-primary);
  padding-left: 14px;
}

.section-sub {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
}

.divider {
  border: 0;
  border-top: 1px solid var(--c-border);
  margin: 32px 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--c-border);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.header-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 14px 24px 0;
}

.header-meta {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: end;
}

.header-meta__slogan {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--c-muted);
  letter-spacing: 0.08em;
  border-left: 3px solid var(--c-primary);
  padding-left: 10px;
  text-transform: uppercase;
}

.update-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  justify-self: end;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  background: var(--c-gold-light);
  color: #6B4B00;
  border: 1px solid var(--c-highlight);
  padding: 8px 12px;
  border-radius: 999px;
}

.update-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.12);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-text);
}

.brand-lockup:hover {
  color: var(--c-text);
}

.brand-lockup__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--c-primary);
  color: #fff;
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 22px;
  border-radius: 8px;
  transform: rotate(-4deg);
  box-shadow: 0 6px 16px rgba(230, 57, 70, 0.28);
}

.brand-lockup__name {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
}

.brand-lockup__tld {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-secondary);
  margin-top: 2px;
}

.brand-lockup--light {
  color: #fff;
}

.brand-lockup--light:hover {
  color: #fff;
}

.brand-lockup--light .brand-lockup__name {
  color: #fff;
}

.brand-lockup--light .brand-lockup__tld {
  color: var(--c-secondary);
}

.main-nav {
  border-top: 1px solid var(--c-border);
  margin-top: 12px;
}

.nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
}

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px 20px;
  color: var(--c-text);
  text-decoration: none;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  border-bottom: 3px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.nav-link__index {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  color: var(--c-secondary);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--c-primary);
}

.nav-link[aria-current="page"] {
  border-bottom-color: var(--c-primary);
}

.nav-link:hover .nav-link__index,
.nav-link[aria-current="page"] .nav-link__index {
  color: var(--c-primary);
}

.nav-toggle {
  display: none;
}

.nav-toggle__bars {
  display: inline-block;
  width: 16px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 5px 0 currentColor, 0 10px 0 currentColor;
  border-radius: 2px;
}

.nav-toggle[aria-expanded="true"] {
  background: var(--c-secondary);
  box-shadow: 0 4px 12px rgba(42, 157, 244, 0.25);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress__fill {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-highlight), var(--c-secondary));
  transition: width 0.2s ease-out;
}

.site-footer {
  background: #1A1A1A;
  color: #C7CAD1;
  border-top: 4px solid var(--c-primary);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 56px 24px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 40px;
}

.footer-description {
  margin-top: 16px;
  color: #9AA0A6;
  font-size: 14px;
  max-width: 520px;
  line-height: 1.8;
}

.footer-column .footer-title {
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--c-highlight);
  letter-spacing: 0.1em;
  margin: 0 0 16px;
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li + li {
  margin-top: 10px;
}

.footer-links a {
  color: #D1D5DB;
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--c-secondary);
}

.footer-contact {
  font-style: normal;
  margin-top: 16px;
  color: #9AA0A6;
}

.footer-contact__row {
  display: block;
  font-size: 14px;
  margin-top: 6px;
}

.footer-note {
  font-size: 13px;
  color: #6B7280;
  line-height: 1.7;
  margin-top: 16px;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  align-items: center;
  border-top: 1px solid #333;
  margin-top: 40px;
  padding-top: 24px;
  font-size: 14px;
  color: #9AA0A6;
}

.footer-legal {
  list-style: none;
  display: flex;
  gap: 16px;
  margin: 0 0 0 auto;
  padding: 0;
}

.footer-legal a {
  color: #C7CAD1;
  text-decoration: none;
}

.footer-legal a:hover {
  color: var(--c-primary);
}

.grid {
  display: grid;
  gap: 20px;
}

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

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

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 6px 14px rgba(230, 57, 70, 0.22);
}

.btn--primary:hover {
  background: #C92A36;
  color: #fff;
}

.btn--secondary {
  background: var(--c-secondary);
  color: #fff;
  box-shadow: 0 6px 14px rgba(42, 157, 244, 0.22);
}

.btn--secondary:hover {
  background: #1F8BDF;
  color: #fff;
}

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

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  color: var(--c-muted);
}

.tag--red {
  background: var(--c-red-light);
  border-color: #F3C1C6;
  color: #A82B35;
}

.tag--blue {
  background: var(--c-blue-light);
  border-color: #B9DCF7;
  color: #1B6FA8;
}

.tag--gold {
  background: var(--c-gold-light);
  border-color: #F1D88C;
  color: #6B4B00;
}

.callout {
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-border);
  border-radius: 8px;
  background: var(--c-surface);
  padding: 16px 20px;
  margin: 24px 0;
}

.callout--red {
  border-left-color: var(--c-primary);
  background: var(--c-red-light);
}

.callout--blue {
  border-left-color: var(--c-secondary);
  background: var(--c-blue-light);
}

.callout--gold {
  border-left-color: var(--c-highlight);
  background: var(--c-gold-light);
}

.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card--stat {
  border-top: 4px solid var(--c-secondary);
}

.card__number {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 36px;
  color: var(--c-primary);
  line-height: 1.1;
}

.card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  text-transform: uppercase;
}

.card__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 18px;
  margin-top: 8px;
}

.card__body {
  font-size: 14px;
  color: var(--c-text);
  margin-top: 8px;
  line-height: 1.7;
}

.panel {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

.panel--paper {
  background: linear-gradient(180deg, #FFFFFF 0%, #FBFBFC 100%);
  box-shadow: 0 6px 0 rgba(26, 26, 26, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--c-border);
  background: #FAFAFA;
}

.panel__body {
  padding: 20px;
}

.panel__foot {
  padding: 14px 20px;
  border-top: 1px solid var(--c-border);
  background: var(--c-bg);
  font-size: 14px;
  color: var(--c-muted);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  background: var(--c-surface);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}

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

.table thead th {
  font-family: var(--font-headline);
  font-weight: 700;
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.table tbody tr:hover {
  background: var(--c-blue-light);
}

.table--striped tbody tr:nth-child(even) {
  background: #FAFAFB;
}

.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-blue-light), var(--c-red-light));
  border: 1px solid var(--c-border);
  aspect-ratio: 16 / 9;
}

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

.image-frame--card {
  aspect-ratio: 4 / 3;
}

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

.toc {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.toc__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 14px;
  color: var(--c-primary);
  margin-bottom: 10px;
}

.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc__link {
  display: block;
  padding: 8px 10px;
  border-left: 3px solid transparent;
  color: var(--c-text);
  text-decoration: none;
  font-size: 14px;
}

.toc__link:hover {
  border-left-color: var(--c-secondary);
  color: var(--c-secondary);
}

.mono {
  font-family: var(--font-mono);
}

.breadcrumb {
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 8px;
}

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

.breadcrumb__link {
  color: var(--c-secondary);
  text-decoration: none;
}

.breadcrumb__current {
  color: var(--c-muted);
}

h1, h2, h3, h4 {
  font-family: var(--font-headline);
  color: var(--c-text);
  line-height: 1.2;
}

h1 {
  font-size: 48px;
  font-weight: 900;
}

h2 {
  font-size: 36px;
  font-weight: 900;
}

h3 {
  font-size: 24px;
  font-weight: 700;
}

@media (max-width: 1024px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 860px) {
  .header-meta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .header-meta__slogan {
    display: none;
  }

  .update-badge {
    display: none;
  }

  .brand-lockup__mark {
    width: 32px;
    height: 32px;
    font-size: 18px;
  }

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

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--c-primary);
    color: #fff;
    border: 0;
    border-radius: 6px;
    padding: 10px 14px;
    font-family: var(--font-headline);
    font-weight: 700;
    font-size: 14px;
    line-height: 1;
    box-shadow: 0 4px 10px rgba(230, 57, 70, 0.2);
  }

  .nav-toggle:hover {
    background: #C92A36;
  }

  .main-nav {
    display: none;
    border-top: 1px solid var(--c-border);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0;
  }

  .nav-link {
    padding: 14px 10px;
    border-bottom: 1px solid var(--c-border);
    border-left: 3px solid transparent;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--c-border);
    border-left-color: var(--c-primary);
  }
}

@media (max-width: 760px) {
  .page-container {
    padding: 28px 16px 64px;
  }

  .section-title {
    font-size: 26px;
  }

  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .footer-inner {
    padding: 40px 20px 24px;
  }

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

  .footer-legal {
    margin-left: 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;
  }

  .scroll-progress__fill {
    transition: none;
  }
}