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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  color: var(--color-text);
  background: var(--color-surface);
  font-family: var(--font-sans);
  font-size: var(--font-size-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

h1,
h2,
h3,
p {
  margin-block: 0;
}

h1,
h2,
h3 {
  color: var(--color-ink);
  font-family: var(--font-display);
  letter-spacing: -0.035em;
  line-height: 1.16;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-accent) 75%, white);
  outline-offset: 4px;
}

[hidden] {
  display: none !important;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 650;
  line-height: 1;
  transition: transform var(--duration-fast) var(--ease-standard),
    background-color var(--duration-fast) ease,
    border-color var(--duration-fast) ease;
}

.button::after {
  content: "↗";
  font-size: 1rem;
  transition: transform var(--duration-fast) var(--ease-standard);
}

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

.button:hover::after {
  transform: translate(2px, -2px);
}

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

.button--primary:hover {
  background: var(--color-primary-strong);
}

.button--light {
  color: var(--color-navy);
  background: var(--color-white);
}

.button--outline-light {
  color: var(--color-white);
  border-color: rgb(255 255 255 / 0.48);
  background: rgb(255 255 255 / 0.06);
}

.button--outline-light:hover {
  border-color: var(--color-white);
  background: rgb(255 255 255 / 0.12);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  line-height: 1.2;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 28px;
  height: 2px;
  content: "";
  background: currentColor;
}

.section-title {
  max-width: 15em;
  font-size: var(--font-size-h2);
  font-weight: 650;
}

.section-summary {
  max-width: 36rem;
  margin-top: 1.25rem;
  color: var(--color-muted);
  font-size: var(--font-size-body-lg);
  line-height: 1.85;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--color-primary);
  font-size: 0.9375rem;
  font-weight: 700;
}

.section-link::after {
  content: "→";
  transition: transform var(--duration-fast) var(--ease-standard);
}

.section-link:hover::after {
  transform: translateX(4px);
}

.image-missing {
  background: linear-gradient(135deg, #dfeaf1, #f7fafc);
}

.image-missing::after {
  position: absolute;
  inset: 50% auto auto 50%;
  content: "图片待补充";
  color: var(--color-muted);
  font-size: var(--font-size-small);
  transform: translate(-50%, -50%);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--duration-normal) var(--ease-standard),
    transform var(--duration-normal) var(--ease-standard);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}