/* ============================================================
   基础层：重置 / 排版 / 可访问性 / 动效降级
   ============================================================ */

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

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.75;
  letter-spacing: 0.015em;
  color: var(--ct-text);
  background: var(--ct-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 全局氛围（浅色）：左上品牌红微光 / 右上靛蓝微光 / 底部金属冷光 + 纸感噪点 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(52rem 34rem at 8% -12%, rgba(255, 36, 0, 0.05), transparent 62%),
    radial-gradient(48rem 36rem at 105% -5%, rgba(66, 33, 183, 0.06), transparent 58%),
    radial-gradient(40rem 30rem at 50% 115%, rgba(2, 132, 199, 0.04), transparent 60%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select, textarea { font: inherit; color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

p { text-wrap: pretty; }

::selection { background: var(--ct-red-deep); color: #fff; }

/* 焦点可见性：键盘可达 */
:focus-visible {
  outline: 2px solid var(--ct-red-soft);
  outline-offset: 3px;
  border-radius: 2px;
}

/* 数字统一等宽，体现工业精确感 */
.num, [data-count] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
  position: relative;
  z-index: 2;
}

/* ---- 入场动效：滚动触发渐显上浮 ---- */
.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, 0ms);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

/* ---- 降级：减少动态偏好 ---- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
}