/* =========================================================
   base.css — 重置、氛围层（波点 + 糖果光斑）、排版基线、可访问性
   ========================================================= */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + var(--space-5));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-weight: 400;
  line-height: var(--lh-body);
  letter-spacing: var(--track-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: var(--track-title);
  line-height: var(--lh-title);
  text-wrap: balance;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }
button, input, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--candy-lemon); color: var(--color-ink); }

/* 焦点：可爱也要看得清楚 —— 3px 珊瑚描边 + 3px 偏移 */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 200;
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-label);
  font-weight: 800;
  font-size: var(--step--1);
  border: var(--stroke) solid var(--color-border);
  border-radius: var(--radius-pill);
  box-shadow: var(--pop-sm);
  transform: translateY(-180%);
  transition: transform var(--dur-fast) var(--ease-pop);
}
.skip-link:focus-visible { transform: translateY(0); }

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

/* ---------- 氛围层 1：波点（母题「点点」） ---------- */
.dots-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(42, 27, 20, 0.13) 1.5px, transparent 1.5px);
  background-size: 26px 26px;
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 55%, transparent 100%);
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 55%, transparent 100%);
}

/* ---------- 氛围层 2：糖果光斑（大面积柔和径向，替代平涂） ---------- */
.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(30rem 30rem at 6% 4%, rgba(255, 215, 94, 0.42), transparent 62%),
    radial-gradient(26rem 26rem at 96% 12%, rgba(192, 169, 255, 0.34), transparent 62%),
    radial-gradient(34rem 30rem at 70% 96%, rgba(127, 216, 190, 0.32), transparent 64%),
    radial-gradient(24rem 24rem at 14% 88%, rgba(255, 179, 138, 0.30), transparent 64%);
}

/* ---------- 氛围层 3：纸纹颗粒（极低透明度） ---------- */
.grain {
  position: fixed;
  inset: 0;
  z-index: 90;
  pointer-events: none;
  opacity: 0.05;
  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='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.bar, main, .site-footer { position: relative; z-index: 2; }

/* ---------- 排版件 ---------- */

/* 圆润胶囊标签 —— 可爱版"元数据口音" */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px 6px 10px;
  background: var(--color-surface);
  border: var(--stroke) solid var(--color-border);
  border-radius: var(--radius-pill);
  box-shadow: var(--pop-sm);
  font-family: var(--font-label);
  font-size: var(--step--1);
  font-weight: 800;
  letter-spacing: var(--track-label);
  color: var(--color-ink);
}
.eyebrow::before {
  content: "";
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 92, 119, 0.22);
  flex: none;
}

.section-title {
  font-family: var(--font-cn-display);
  font-size: clamp(1.8rem, 4.4vw, var(--step-5));
  font-weight: 400;              /* ZCOOL KuaiLe 只有 400 */
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.lead {
  font-size: clamp(1rem, 1.3vw, 1.12rem);
  line-height: 1.95;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.section { padding-block: clamp(64px, 10vw, var(--space-8)); }

/* ---------- 入场：CSS 负责过渡与回弹，JS 只加 .is-in ---------- */
.reveal {
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-pop);
  transition-delay: var(--reveal-delay, 0ms);
}
html.js .reveal { opacity: 0; transform: translateY(30px) scale(0.97); }
html.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 降级：系统的减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html.js .reveal { opacity: 1; transform: none; }
  .marquee__track { animation: none !important; }
  .meter__fill { width: var(--lvl) !important; }
}