/* ============================================================
   雅瓷 YACI · 展示主站样式（浅色青瓷主题）
   ============================================================ */
:root {
  /* 色彩 */
  --celadon-50:  #F1F6F3;
  --celadon-100: #E2EEE8;
  --celadon-200: #C7DDD3;
  --celadon-300: #9CC7B8;
  --celadon-400: #7BA99C;
  --celadon-500: #5C8C7E;
  --celadon-600: #3F6F63;
  --celadon-700: #2E544B;

  --ivory:   #FBFAF7;
  --paper:   #F2F1EC;
  --white:   #FFFFFF;
  --ink:     #1F2A28;
  --ink-2:   #4A5854;
  --ink-3:   #7A8884;

  --bg:      var(--ivory);
  --accent:  var(--celadon-600);
  --accent-soft: var(--celadon-300);

  /* 排版 */
  --font-cjk: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-en:  "Inter", system-ui, sans-serif;
  --font-display: "Sora", "Noto Sans SC", system-ui, sans-serif;

  /* 尺寸 */
  --container: 1200px;
  --radius:   20px;
  --radius-sm: 14px;
  --shadow-sm: 0 2px 10px rgba(46, 84, 75, 0.06);
  --shadow:    0 12px 36px rgba(46, 84, 75, 0.10);
  --shadow-lg: 0 24px 60px rgba(46, 84, 75, 0.16);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cjk);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* 焦点可见性（无障碍） */
:focus-visible {
  outline: 3px solid var(--celadon-400);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
  font-size: 15px;
  min-height: 48px;
}
.btn--sm { padding: 9px 18px; min-height: 40px; font-size: 14px; }
.btn--block { width: 100%; }
.btn--primary {
  background: linear-gradient(135deg, var(--celadon-500), var(--celadon-600));
  color: var(--ivory);
  box-shadow: 0 10px 24px rgba(63, 111, 99, 0.28);
}
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 32px rgba(63, 111, 99, 0.34); }
.btn--ghost {
  background: rgba(255,255,255,0.6);
  border-color: var(--celadon-200);
  color: var(--celadon-700);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { transform: translateY(-3px); background: var(--white); box-shadow: var(--shadow); }

/* ============ 通用区块 ============ */
.section { padding: 110px 0; position: relative; }
.section__head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent);
  background: var(--celadon-100);
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 18px;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.section__sub { color: var(--ink-2); font-size: 17px; margin-top: 16px; }
.lead { font-size: 19px; color: var(--ink); font-weight: 500; margin: 18px 0 14px; }
.pill {
  display: inline-flex; align-items: center;
  font-family: var(--font-display); font-weight: 600;
  font-size: 13px; letter-spacing: .08em;
  color: var(--celadon-700);
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--celadon-200);
  padding: 8px 16px; border-radius: 999px;
  backdrop-filter: blur(8px);
}

/* ============ 导航 ============ */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background .3s var(--ease), box-shadow .3s var(--ease), backdrop-filter .3s;
}
.nav.is-scrolled {
  background: rgba(251, 250, 247, 0.82);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid rgba(199, 221, 211, 0.5);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__mark { display: inline-flex; }
.brand__name { font-family: var(--font-display); font-weight: 700; font-size: 19px; color: var(--ink); }
.brand__name i { font-style: normal; font-weight: 600; color: var(--accent); font-size: 14px; letter-spacing: .1em; }
.brand__name--light { color: var(--ivory); }
.brand__name--light i { color: var(--celadon-300); }

.nav__links { display: flex; gap: 30px; }
.nav__links a {
  font-size: 15px; color: var(--ink-2); font-weight: 500;
  position: relative; padding: 4px 0;
  transition: color .2s;
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); transition: right .3s var(--ease);
}
.nav__links a:hover { color: var(--accent); }
.nav__links a:hover::after { right: 0; }

.nav__actions { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  width: 42px; height: 40px; border-radius: 999px;
  border: 1px solid var(--celadon-200);
  background: rgba(255,255,255,0.6); color: var(--celadon-700);
  cursor: pointer; transition: background .2s, transform .2s;
}
.lang-toggle:hover { background: var(--white); transform: translateY(-2px); }

.nav__burger { display: none; flex-direction: column; gap: 5px; width: 44px; height: 44px; background: none; border: 0; cursor: pointer; align-items: center; justify-content: center; }
.nav__burger span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .3s var(--ease), opacity .3s; }
.nav__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Hero ============ */
.hero { position: relative; min-height: 100vh; min-height: 100dvh; display: flex; align-items: center; overflow: hidden; }
.hero__bg { position: absolute; inset: 0; z-index: -2; }
.hero__bg img { width: 100%; height: 120%; object-fit: cover; object-position: center; }
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(251,250,247,0.92) 0%, rgba(251,250,247,0.6) 42%, rgba(251,250,247,0.15) 100%);
}
.hero__glow {
  position: absolute; z-index: -1; width: 60vw; height: 60vw; max-width: 720px; max-height: 720px;
  right: -10%; top: 10%; border-radius: 50%;
  background: radial-gradient(circle, rgba(156,199,184,0.5), transparent 65%);
  filter: blur(20px);
}
.hero__content { position: relative; max-width: 760px; }
.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 6.4vw, 72px);
  line-height: 1.08; letter-spacing: -0.02em;
  margin: 22px 0 24px; color: var(--ink);
}
.hero__subtitle { font-size: clamp(16px, 2vw, 20px); color: var(--ink-2); max-width: 600px; }
.hero__cta { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.hero__scroll {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3);
}
.hero__scroll-line { width: 1px; height: 42px; background: linear-gradient(var(--celadon-400), transparent); }

/* ============ 关于 ============ */
.about { background: linear-gradient(180deg, var(--ivory), var(--celadon-50)); }
.about__grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 64px; align-items: center; }
.about__media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); }
.about__media img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 38px; }
.stat { background: var(--white); border-radius: var(--radius-sm); padding: 22px 16px; text-align: center; box-shadow: var(--shadow-sm); border: 1px solid var(--celadon-100); }
.stat__num { display: block; font-family: var(--font-display); font-weight: 700; font-size: clamp(26px, 3.4vw, 38px); color: var(--accent); line-height: 1; }
.stat__label { display: block; font-size: 13px; color: var(--ink-2); margin-top: 8px; }

/* ============ 产品卡片 ============ */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card {
  background: var(--white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-sm); border: 1px solid var(--celadon-100);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.card__media { overflow: hidden; aspect-ratio: 4/3; }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s var(--ease); }
.card:hover .card__media img { transform: scale(1.06); }
.card__body { padding: 22px; }
.card__title { font-family: var(--font-display); font-size: 19px; font-weight: 600; margin-bottom: 8px; }
.card__desc { font-size: 14.5px; color: var(--ink-2); }

/* ============ 技术能力 / 预留服务 ============ */
.tech { background: linear-gradient(180deg, var(--celadon-50), var(--ivory)); }
.tech-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; max-width: 920px; margin: 0 auto; }
.tech-card {
  position: relative; background: var(--white); border-radius: var(--radius);
  padding: 38px 34px; box-shadow: var(--shadow-sm); border: 1px solid var(--celadon-100);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
  overflow: hidden;
}
.tech-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--celadon-300), var(--celadon-600));
}
.tech-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.tech-card__badge {
  position: absolute; top: 20px; right: 20px;
  font-family: var(--font-display); font-size: 12px; font-weight: 600;
  color: var(--celadon-700); background: var(--celadon-100);
  padding: 5px 12px; border-radius: 999px;
}
.tech-card__icon {
  width: 58px; height: 58px; border-radius: 16px; display: inline-flex; align-items: center; justify-content: center;
  background: var(--celadon-100); color: var(--accent); margin-bottom: 20px;
}
.tech-card__title { font-family: var(--font-display); font-size: 21px; font-weight: 600; margin-bottom: 10px; }
.tech-card__desc { color: var(--ink-2); font-size: 15px; }

/* ============ 案例（横向滚动） ============ */
.cases { padding-bottom: 130px; overflow: hidden; }
.cases__viewport { margin-top: 10px; }
.cases__track { display: flex; gap: 26px; padding: 0 24px; will-change: transform; }
.case-card {
  position: relative; flex: 0 0 clamp(280px, 40vw, 460px);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  aspect-ratio: 4/3;
}
.case-card img { width: 100%; height: 100%; object-fit: cover; }
.case-card__info {
  position: absolute; inset: auto 0 0 0; padding: 26px 24px 22px;
  background: linear-gradient(transparent, rgba(31,42,40,0.78));
  color: var(--ivory);
}
.case-card__info h3 { font-family: var(--font-display); font-size: 20px; font-weight: 600; }
.case-card__info p { font-size: 14px; opacity: .9; margin-top: 4px; }

/* ============ 联系 ============ */
.contact { background: linear-gradient(180deg, var(--ivory), var(--celadon-50)); }
.contact__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.contact__info { list-style: none; margin-top: 28px; display: grid; gap: 10px; color: var(--ink-2); font-size: 15.5px; }
.contact__info strong { color: var(--ink); font-size: 18px; font-family: var(--font-display); }
.contact__form { background: var(--white); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); border: 1px solid var(--celadon-100); }
.field { display: block; margin-bottom: 18px; }
.field > span { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 8px; }
.field input, .field textarea {
  width: 100%; font: inherit; font-size: 15px; color: var(--ink);
  padding: 13px 16px; border-radius: var(--radius-sm);
  border: 1px solid var(--celadon-200); background: var(--ivory);
  transition: border-color .2s, box-shadow .2s, background .2s;
  resize: vertical;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--celadon-400); background: var(--white); box-shadow: 0 0 0 4px rgba(156,199,184,0.25); }
.field__note { font-size: 13px; color: var(--ink-3); margin-top: 12px; text-align: center; }

/* ============ 页脚 ============ */
.footer { background: var(--celadon-700); color: rgba(251,250,247,0.86); padding-top: 64px; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 48px; }
.footer__slogan { font-family: var(--font-display); color: var(--celadon-300); margin: 16px 0 10px; font-weight: 600; }
.footer__desc { font-size: 14px; max-width: 360px; color: rgba(251,250,247,0.7); }
.footer__col h4 { font-family: var(--font-display); font-size: 15px; color: var(--ivory); margin-bottom: 16px; }
.footer__col a, .footer__col span { display: block; font-size: 14px; color: rgba(251,250,247,0.7); margin-bottom: 10px; transition: color .2s; }
.footer__col a:hover { color: var(--celadon-300); }
.footer__bar { border-top: 1px solid rgba(251,250,247,0.14); padding: 20px 0; }
.footer__bar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: rgba(251,250,247,0.6); }
.footer__beian a { color: rgba(251,250,247,0.6); transition: color .2s; }
.footer__beian a:hover { color: var(--celadon-300); }

/* ============ 进场动画初始态（仅在 JS 启用时隐藏，避免无 JS 时空白） ============ */
.has-js .reveal { opacity: 0; transform: translateY(28px); }

/* ============ 响应式 ============ */
@media (max-width: 980px) {
  .about__grid, .contact__grid { grid-template-columns: 1fr; gap: 40px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .section { padding: 80px 0; }
  .nav__links { display: none; }
  .nav__burger { display: inline-flex; }
  .nav__links.is-open {
    display: flex; flex-direction: column; gap: 4px;
    position: absolute; top: 76px; left: 0; right: 0;
    background: rgba(251,250,247,0.97); backdrop-filter: blur(14px);
    padding: 16px 24px 24px; box-shadow: var(--shadow);
    border-bottom: 1px solid var(--celadon-200);
  }
  .nav__links.is-open a { padding: 12px 0; font-size: 17px; border-bottom: 1px solid var(--celadon-100); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .tech-cards { grid-template-columns: 1fr; }
  .nav__actions .btn--sm { display: none; }
}
@media (max-width: 460px) {
  .cards { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
}

/* ============ 减少动效偏好 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .has-js .reveal { opacity: 1 !important; transform: none !important; }
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}