@import url("tokens.css");

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

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

body {
  font-family: var(--font-cn);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--lh-tight);
  letter-spacing: -.01em;
}

::selection {
  background: var(--brand-blue);
  color: #fff;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--sp-10);
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--sp-16);
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--brand-blue-mid);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

/* --- Typography helpers --- */
.display {
  font-size: var(--fs-display);
  font-weight: 800;
  line-height: var(--lh-tight);
  letter-spacing: -.02em;
}

.h1 {
  font-size: var(--fs-h1);
  font-weight: 800;
}

.h2 {
  font-size: var(--fs-h2);
  font-weight: 800;
}

.h3 {
  font-size: var(--fs-h3);
  font-weight: 700;
}

.lead {
  font-size: clamp(1rem, 1.6vw, 1.1875rem);
  line-height: var(--lh-normal);
  color: var(--text-secondary);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--brand-blue-mid);
}

.eyebrow::before {
  content: "";
  width: 2.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-blue-mid), var(--smart-blue));
  border-radius: 2px;
}

.eyebrow.on-dark {
  color: var(--smart-blue);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: .875rem 1.75rem;
  border-radius: var(--r-full);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: .01em;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px) scale(.99);
}

.btn-primary {
  background: var(--brand-blue);
  color: #fff;
  box-shadow: var(--shadow-brand);
}

.btn-primary:hover {
  background: var(--brand-blue-mid);
  transform: translateY(-2px);
  box-shadow: 0 20px 48px -12px rgba(0,43,147,.5);
}

.btn-ghost {
  background: rgba(255,255,255,.08);
  color: #fff;
  border: 1px solid rgba(255,255,255,.24);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: rgba(255,255,255,.16);
  border-color: rgba(255,255,255,.4);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--brand-blue);
  border: 1.5px solid var(--brand-blue);
}

.btn-outline:hover {
  background: var(--brand-blue);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline.on-dark {
  color: #fff;
  border-color: rgba(255,255,255,.4);
}

.btn-outline.on-dark:hover {
  background: #fff;
  color: var(--brand-blue);
}

.btn-lg {
  padding: 1.0625rem 2.25rem;
  font-size: 1rem;
}

.btn .icon {
  width: 1.125rem;
  height: 1.125rem;
  transition: transform var(--dur-fast) var(--ease-out);
}

.btn:hover .icon {
  transform: translateX(3px);
}

/* --- Section header --- */
.section-head {
  max-width: 48rem;
  margin-bottom: var(--sp-8);
}

.section-head.center {
  margin-inline: auto;
  text-align: center;
}

.section-head.center .eyebrow {
  justify-content: center;
}

.section-head.center .eyebrow::after {
  content: "";
  width: 2.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--smart-blue), var(--brand-blue-mid));
  border-radius: 2px;
}

.section-head h2 {
  margin-top: var(--sp-4);
  margin-bottom: var(--sp-4);
}

.section-head.on-dark h2 {
  color: #fff;
}

.section-head.on-dark .lead {
  color: var(--text-inverse-dim);
}

/* --- Grid utilities --- */
.grid {
  display: grid;
  gap: var(--sp-6);
}

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

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* --- Cards --- */
.card {
  background: var(--bg-white);
  border: 1px solid var(--line-light);
  border-radius: var(--r-lg);
  padding: var(--sp-6);
  transition: transform var(--dur-med) var(--ease-out),
              box-shadow var(--dur-med) var(--ease-out),
              border-color var(--dur-med) var(--ease-out);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0,43,147,.18);
}

/* --- Marquee --- */
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 32s linear infinite;
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

/* --- Grid background pattern (VI 辅助图形灵感) --- */
.pattern-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(148,189,233,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,189,233,.07) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 20%, #000 40%, transparent 100%);
}

.pattern-grid.on-dark {
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
}