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

:root {
  --color-red: #E63946;
  --color-blue: #1D3557;
  --color-silver: #CAD2C5;
  --color-cream: #F5F0E8;
  --color-warm-gray: #D4C9B8;
  --color-amber: #FFB347;
  --color-deep-gray: #2D2D2D;
  --color-mid-gray: #4A4A4A;
  --color-light-gray: #B0B0B0;
  --color-white: #FFFFFF;
  --font-heading: Georgia, "Times New Roman", serif;
  --font-body: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-data: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --space-unit: 1rem;
  --space-xs: calc(0.25 * var(--space-unit));
  --space-sm: calc(0.5 * var(--space-unit));
  --space-md: var(--space-unit);
  --space-lg: calc(2 * var(--space-unit));
  --space-xl: calc(4 * var(--space-unit));
  --max-width: 1200px;
  --header-height: 64px;
  --border-radius: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --transition-base: 0.25s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-mid-gray);
  background-color: var(--color-cream);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-blue);
  letter-spacing: -0.01em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
  color: var(--color-red);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

a:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 2px;
  border-radius: 2px;
}

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

ul, ol {
  list-style: none;
}

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

input, textarea {
  font: inherit;
  color: inherit;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.5rem 1rem;
  background: var(--color-blue);
  color: var(--color-white);
  border-radius: 0 0 4px 4px;
  font-size: 0.875rem;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
  outline: none;
}

[data-header] {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9000;
  height: var(--header-height);
  background: transparent;
  transition: background var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
}

[data-header].scrolled {
  background: var(--color-blue);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  position: relative;
}

.header__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-blue);
  transition: color var(--transition-base);
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
}

[data-header].scrolled .header__logo {
  color: var(--color-white);
}

.header__logo-mark {
  color: var(--color-red);
}

[data-header].scrolled .header__logo-mark {
  color: var(--color-red);
}

.header__logo-cn {
  font-weight: 300;
  font-size: 0.9em;
  margin-left: 0.1em;
  opacity: 0.8;
}

[data-header].scrolled .header__logo-cn {
  opacity: 0.9;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  padding: 4px;
  background: transparent;
  border-radius: 4px;
  transition: background var(--transition-base);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-red);
  outline-offset: 2px;
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-blue);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base), background var(--transition-base);
}

[data-header].scrolled .nav-toggle__bar {
  background: var(--color-white);
}

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

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

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

.header__nav {
  display: flex;
  align-items: center;
}

.nav__list {
  display: flex;
  gap: 0.25rem;
}

.nav__link {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-blue);
  padding: 0.4rem 0.85rem;
  border-radius: 4px;
  transition: color var(--transition-base), background var(--transition-base);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-red);
  background: rgba(230, 57, 70, 0.06);
}

.nav__link[aria-current="page"] {
  color: var(--color-red);
  background: rgba(230, 57, 70, 0.10);
  font-weight: 600;
}

[data-header].scrolled .nav__link {
  color: var(--color-white);
}

[data-header].scrolled .nav__link:hover {
  color: var(--color-amber);
  background: rgba(255, 255, 255, 0.10);
}

[data-header].scrolled .nav__link[aria-current="page"] {
  color: var(--color-amber);
  background: rgba(255, 179, 71, 0.15);
}

.header__search {
  display: flex;
  align-items: center;
  position: relative;
  margin-left: 1rem;
}

.header__search-input {
  width: 140px;
  padding: 0.35rem 0.75rem 0.35rem 2rem;
  border: 1px solid var(--color-light-gray);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.8rem;
  transition: width var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

.header__search-input:focus {
  width: 200px;
  border-color: var(--color-red);
  background: var(--color-white);
  outline: none;
}

[data-header].scrolled .header__search-input {
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.10);
  color: var(--color-white);
}

[data-header].scrolled .header__search-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

[data-header].scrolled .header__search-input:focus {
  border-color: var(--color-amber);
  background: rgba(255, 255, 255, 0.18);
}

.header__search-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  line-height: 1;
  color: var(--color-light-gray);
  pointer-events: none;
}

[data-header].scrolled .header__search-icon {
  color: rgba(255, 255, 255, 0.5);
}

.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--color-red);
  transition: width 0.1s linear;
  z-index: 1;
}

.scroll-progress[style*="width: 100"] {
  background: var(--color-amber);
}

[data-header].scrolled .scroll-progress {
  opacity: 0.9;
}

[data-footer] {
  background: var(--color-deep-gray);
  color: var(--color-silver);
  padding: var(--space-xl) 0 0;
  font-size: 0.875rem;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1.5fr 1fr;
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.footer__logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-white);
  display: inline-block;
  margin-bottom: var(--space-sm);
}

.footer__logo:hover {
  color: var(--color-amber);
}

.footer__tagline {
  font-size: 0.8rem;
  color: var(--color-light-gray);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
}

.footer__trust {
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--color-warm-gray);
  opacity: 0.75;
  max-width: 32em;
}

.footer__info-item {
  margin-bottom: var(--space-xs);
  line-height: 1.5;
}

.footer__info-item.note {
  font-style: italic;
  opacity: 0.7;
  margin-top: var(--space-sm);
  font-size: 0.8rem;
}

.footer__link {
  color: var(--color-silver);
  transition: color var(--transition-base);
}

.footer__link:hover {
  color: var(--color-amber);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links .footer__link {
  font-weight: 500;
  border-left: 2px solid var(--color-red);
  padding-left: var(--space-sm);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-md) 0;
  text-align: center;
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-light-gray);
  opacity: 0.6;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 4px;
  transition: background var(--transition-base), color var(--transition-base), box-shadow var(--transition-base);
  text-align: center;
  line-height: 1.2;
}

.btn--primary {
  background: var(--color-red);
  color: var(--color-white);
}

.btn--primary:hover {
  background: #c62e3a;
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background: var(--color-blue);
  color: var(--color-white);
}

.btn--secondary:hover {
  background: #15283f;
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.card {
  background: var(--color-silver);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-blue);
  margin-bottom: var(--space-sm);
}

.card__body {
  font-size: 0.9rem;
  color: var(--color-mid-gray);
  line-height: 1.5;
}

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

.section__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-blue);
  margin-bottom: var(--space-md);
  position: relative;
  padding-bottom: var(--space-sm);
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--color-red);
  border-radius: 2px;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--color-amber);
  color: var(--color-deep-gray);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 3px;
  letter-spacing: 0.02em;
}

.data-value {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-red);
  line-height: 1.1;
}

.data-label {
  font-family: var(--font-data);
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--color-light-gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.divider {
  width: 100%;
  height: 1px;
  background: var(--color-light-gray);
  opacity: 0.35;
  margin: var(--space-md) 0;
}

.tilt-line {
  position: relative;
  overflow: hidden;
}

.tilt-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: -10%;
  width: 120%;
  height: 2px;
  background: var(--color-red);
  opacity: 0.3;
  transform: skew(-12deg);
  pointer-events: none;
}

@media (max-width: 1024px) {
  .header__search-input {
    width: 100px;
  }
  .header__search-input:focus {
    width: 140px;
  }
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: flex;
  }
  .header__nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
    padding: 0 1.5rem;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
  }
  [data-header].scrolled .header__nav {
    background: var(--color-blue);
  }
  [data-nav][data-open] {
    max-height: 360px;
    padding: var(--space-md) 1.5rem;
  }
  .nav__list {
    flex-direction: column;
    gap: 0.15rem;
  }
  .nav__link {
    padding: 0.6rem 0.75rem;
    font-size: 1rem;
  }
  [data-header].scrolled .nav__link {
    color: var(--color-white);
  }
  [data-header].scrolled .nav__link:hover {
    color: var(--color-amber);
  }
  .header__search {
    margin-left: auto;
    margin-right: 0.5rem;
  }
  .header__search-input {
    width: 90px;
    padding-left: 1.6rem;
    font-size: 0.75rem;
  }
  .header__search-input:focus {
    width: 130px;
  }
  .header__search-icon {
    left: 0.4rem;
    font-size: 0.85rem;
  }
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    text-align: center;
  }
  .footer__links {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm) var(--space-md);
  }
  .footer__links .footer__link {
    border-left: none;
    padding-left: 0;
    border-bottom: 2px solid var(--color-red);
    padding-bottom: 0.15rem;
  }
  .footer__trust {
    margin-left: auto;
    margin-right: auto;
  }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.65rem; }
  h3 { font-size: 1.3rem; }
  .section__title { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  :root {
    --header-height: 56px;
  }
  .header__logo {
    font-size: 1.25rem;
  }
  .header__search-input {
    width: 70px;
    padding-left: 1.4rem;
  }
  .header__search-input:focus {
    width: 100px;
  }
  .header__search-icon {
    left: 0.3rem;
    font-size: 0.75rem;
  }
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  .section {
    padding: var(--space-lg) 0;
  }
  .data-value {
    font-size: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress {
    transition: none;
  }
  .card:hover {
    transform: none;
  }
}

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

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