/* ========================================================================
   base.css — reset + 排版 + 容器
   ======================================================================== */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--brand); text-decoration: none; transition: color var(--t); }
a:hover { color: var(--brand-dark); }

h1, h2, h3, h4, h5 { margin: 0 0 .5em; line-height: 1.25; font-weight: 700; color: var(--c-gray-800); }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }
p  { margin: 0 0 1em; }

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

button { font-family: inherit; cursor: pointer; }

/* 布局工具 */
.container { max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section--soft { background: var(--bg-soft); }
.section--tight { padding: 40px 0; }
.text-center { text-align: center; }
.muted { color: var(--muted); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* 区块标题 */
.section-head { text-align: center; max-width: 720px; margin: 0 auto 40px; }
.section-head .eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--brand); margin-bottom: 8px;
}
.section-head h2 { margin: 0; }
.section-head p { color: var(--muted); margin: 12px 0 0; }

/* 网格 */
.grid { display: grid; gap: 24px; }
.grid--cat { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.grid--prod { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }