/* ==========================================================================
   TEA14888 — 主样式表（桌面基准）
   茶主题配色：深茶绿 + 茶汤金 + 米白
   ========================================================================== */

:root {
  --c-green-900: #12281f;
  --c-green-800: #1b4332;
  --c-green-700: #2d6a4f;
  --c-green-600: #40916c;
  --c-green-300: #95d5b2;
  --c-green-100: #eaf0eb;
  --c-gold: #c9a227;
  --c-gold-light: #e0c35c;
  --c-cream: #faf8f3;
  --c-white: #ffffff;
  --c-ink: #22252a;
  --c-ink-soft: #5a6270;
  --c-line: rgba(27, 67, 50, 0.12);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 2px 10px rgba(18, 40, 31, 0.06);
  --shadow: 0 8px 30px rgba(18, 40, 31, 0.10);
  --shadow-lg: 0 20px 60px rgba(18, 40, 31, 0.16);

  --container: 1200px;
  --header-h: 78px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-ink);
  background: var(--c-cream);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

h1, h2, h3, h4 { margin: 0 0 0.5em; line-height: 1.25; font-weight: 700; letter-spacing: -0.01em; }

p { margin: 0 0 1em; }

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(250, 248, 243, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(250, 248, 243, 0.96);
  border-bottom-color: var(--c-line);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  color: var(--c-white);
  background: linear-gradient(145deg, var(--c-green-700), var(--c-green-800));
  box-shadow: 0 4px 14px rgba(27, 67, 50, 0.28);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }

.brand-text strong {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--c-green-800);
}

.brand-text em {
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--c-ink-soft);
  text-transform: uppercase;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 30px; }

.main-nav ul { display: flex; align-items: center; gap: 4px; }

.main-nav a {
  position: relative;
  display: block;
  padding: 9px 15px;
  font-size: 15px;
  color: var(--c-ink);
  border-radius: 999px;
  transition: color .22s var(--ease), background .22s var(--ease);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 4px;
  height: 2px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s var(--ease);
}

.main-nav a:hover { color: var(--c-green-700); }

.main-nav a.active { color: var(--c-green-800); font-weight: 600; }

.main-nav a.active::after { transform: scaleX(1); }

/* 语言切换 */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: var(--c-white);
  transition: border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.lang-toggle:hover { border-color: var(--c-green-600); box-shadow: var(--shadow-sm); }

.lang-opt { color: var(--c-ink-soft); transition: color .2s var(--ease); }

.lang-opt.active { color: var(--c-green-800); font-weight: 700; }

.lang-sep { color: var(--c-line); }

/* 汉堡菜单 */
.menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 11px;
  border-radius: 10px;
}

.menu-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--c-green-800);
  border-radius: 2px;
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}

.menu-btn.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-btn.is-open span:nth-child(2) { opacity: 0; }
.menu-btn.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 890;
  background: rgba(18, 40, 31, 0.42);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s var(--ease), visibility .3s var(--ease);
}

.nav-overlay.is-visible { opacity: 1; visibility: visible; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: calc(var(--header-h) + 92px) 0 96px;
  overflow: hidden;
  background: linear-gradient(165deg, #f5f7f2 0%, var(--c-cream) 55%, #f2efe6 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 18%, rgba(64, 145, 108, 0.16), transparent 46%),
    radial-gradient(circle at 12% 78%, rgba(201, 162, 39, 0.13), transparent 50%);
}

.hero-inner { position: relative; max-width: 760px; }

.hero-tag {
  display: inline-block;
  margin-bottom: 20px;
  padding: 7px 16px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-green-700);
  background: rgba(64, 145, 108, 0.10);
  border: 1px solid rgba(64, 145, 108, 0.22);
  border-radius: 999px;
}

.hero-title {
  font-size: 60px;
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  color: var(--c-green-900);
}

.hero-title span {
  display: block;
  background: linear-gradient(100deg, var(--c-green-800) 8%, var(--c-green-600) 52%, var(--c-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  max-width: 620px;
  font-size: 17.5px;
  color: var(--c-ink-soft);
  margin-bottom: 34px;
}

.hero-btns { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 44px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15.5px;
  font-weight: 600;
  border-radius: 999px;
  transition: transform .24s var(--ease), box-shadow .24s var(--ease),
              background .24s var(--ease), color .24s var(--ease);
}

.btn-primary {
  color: var(--c-white);
  background: linear-gradient(135deg, var(--c-green-700), var(--c-green-800));
  box-shadow: 0 8px 24px rgba(27, 67, 50, 0.26);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(27, 67, 50, 0.32);
}

.btn-ghost {
  color: var(--c-green-800);
  border: 1.5px solid rgba(27, 67, 50, 0.24);
  background: transparent;
}

.btn-ghost:hover {
  background: var(--c-white);
  border-color: var(--c-green-600);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }

.hero-points { display: flex; flex-wrap: wrap; gap: 30px; }

.hero-points li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  color: var(--c-ink-soft);
}

.hero-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.18);
}

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }

.section-alt { background: var(--c-white); }

.section-dark {
  color: #e8efe9;
  background: linear-gradient(160deg, var(--c-green-900), #1a3a2c 62%, #17342a);
}

.section-head { max-width: 680px; margin: 0 auto 56px; text-align: center; }

.section-head h2 {
  font-size: 38px;
  color: var(--c-green-900);
  margin-bottom: 14px;
}

.section-head p { font-size: 16.5px; color: var(--c-ink-soft); margin: 0; }

.section-head-light h2 { color: #f2f7f3; }
.section-head-light p { color: rgba(232, 239, 233, 0.72); }

.section-note {
  margin: 42px 0 0;
  text-align: center;
  font-size: 14px;
  color: var(--c-ink-soft);
}

/* ---------- 产品网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.product-card {
  position: relative;
  padding: 26px 26px 30px;
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
  overflow: hidden;
}

.product-card::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-green-600), var(--c-gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .38s var(--ease);
}

.product-card:hover {
  transform: translateY(-6px);
  border-color: rgba(64, 145, 108, 0.28);
  box-shadow: var(--shadow);
}

.product-card:hover::after { transform: scaleX(1); }

.product-thumb {
  height: 132px;
  margin-bottom: 20px;
  border-radius: var(--radius);
  background: linear-gradient(150deg, var(--c-green-100), #dfeae2);
  position: relative;
  overflow: hidden;
}

.product-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 32% 40%, rgba(64, 145, 108, 0.30) 0 26%, transparent 27%),
    radial-gradient(circle at 62% 62%, rgba(201, 162, 39, 0.22) 0 20%, transparent 21%);
}

.product-thumb[data-cat="black"]::before {
  background-image:
    radial-gradient(circle at 30% 44%, rgba(122, 62, 30, 0.28) 0 26%, transparent 27%),
    radial-gradient(circle at 64% 60%, rgba(201, 162, 39, 0.24) 0 18%, transparent 19%);
}

.product-thumb[data-cat="oolong"]::before {
  background-image:
    radial-gradient(circle at 34% 42%, rgba(71, 122, 74, 0.30) 0 24%, transparent 25%),
    radial-gradient(circle at 60% 64%, rgba(156, 138, 52, 0.24) 0 20%, transparent 21%);
}

.product-thumb[data-cat="puer"]::before {
  background-image:
    radial-gradient(circle at 32% 46%, rgba(74, 45, 30, 0.34) 0 26%, transparent 27%),
    radial-gradient(circle at 62% 58%, rgba(140, 92, 45, 0.28) 0 18%, transparent 19%);
}

.product-thumb[data-cat="white"]::before {
  background-image:
    radial-gradient(circle at 34% 40%, rgba(150, 178, 158, 0.34) 0 26%, transparent 27%),
    radial-gradient(circle at 62% 62%, rgba(214, 206, 176, 0.30) 0 20%, transparent 21%);
}

.product-thumb[data-cat="herbal"]::before {
  background-image:
    radial-gradient(circle at 30% 42%, rgba(190, 128, 150, 0.26) 0 24%, transparent 25%),
    radial-gradient(circle at 64% 60%, rgba(201, 162, 39, 0.22) 0 20%, transparent 21%);
}

.product-card h3 { font-size: 21px; color: var(--c-green-800); margin-bottom: 6px; }

.product-card p { font-size: 14.5px; color: var(--c-ink-soft); margin-bottom: 14px; }

.product-more {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--c-green-600);
  transition: color .22s var(--ease);
}

.product-card:hover .product-more { color: var(--c-gold); }

/* ---------- 优势 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature {
  padding: 32px 26px;
  background: var(--c-cream);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: background .3s var(--ease), border-color .3s var(--ease), transform .3s var(--ease);
}

.feature:hover {
  background: var(--c-white);
  border-color: var(--c-line);
  transform: translateY(-4px);
}

.feature-no {
  display: block;
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-gold);
}

.feature h3 { font-size: 19px; color: var(--c-green-800); margin-bottom: 8px; }

.feature p { font-size: 14.5px; color: var(--c-ink-soft); margin: 0; }

/* ---------- 关于 ---------- */
.about-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 64px;
  align-items: center;
}

.about-text h2 { font-size: 38px; color: var(--c-green-900); margin-bottom: 20px; }

.about-text p { font-size: 16.5px; color: var(--c-ink-soft); }

.about-actions { margin-top: 30px; }

.about-visual { display: grid; place-items: center; min-height: 320px; }

.about-orb {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 30%, rgba(255,255,255,0.9), transparent 46%),
    linear-gradient(145deg, var(--c-green-600), var(--c-green-800) 66%, #123328);
  box-shadow: 0 30px 70px rgba(27, 67, 50, 0.30), inset 0 -20px 50px rgba(0,0,0,0.18);
  position: relative;
}

.about-orb::after {
  content: "";
  position: absolute;
  inset: 18%;
  border-radius: 50%;
  border: 1px dashed rgba(255, 255, 255, 0.28);
}

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 46px;
  align-items: start;
}

.contact-form {
  padding: 34px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(6px);
}

.field { margin-bottom: 18px; }

.field label {
  display: block;
  margin-bottom: 8px;
  font-size: 13.5px;
  letter-spacing: 0.02em;
  color: rgba(232, 239, 233, 0.82);
}

.field input,
.field textarea {
  width: 100%;
  padding: 13px 16px;
  font: inherit;
  font-size: 15px;
  color: #f2f7f3;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color .22s var(--ease), background .22s var(--ease);
}

.field textarea { resize: vertical; min-height: 110px; }

.field input::placeholder,
.field textarea::placeholder { color: rgba(232, 239, 233, 0.38); }

.field input:focus,
.field textarea:focus {
  border-color: var(--c-green-300);
  background: rgba(255, 255, 255, 0.12);
}

.form-hint { margin: 14px 0 0; font-size: 13.5px; min-height: 20px; }
.form-hint.is-ok { color: var(--c-green-300); }
.form-hint.is-err { color: #ffb4a2; }

.contact-info h3 { font-size: 20px; color: #f2f7f3; margin-bottom: 22px; }

.contact-info ul { display: grid; gap: 20px; }

.contact-info li {
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
}

.ci-label {
  display: block;
  margin-bottom: 5px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(232, 239, 233, 0.55);
}

.ci-value { font-size: 16px; color: #f2f7f3; }

.ci-value.placeholder {
  display: inline-block;
  padding: 3px 12px;
  font-size: 14px;
  color: var(--c-gold-light);
  background: rgba(201, 162, 39, 0.12);
  border: 1px dashed rgba(201, 162, 39, 0.42);
  border-radius: 999px;
}

.ci-note { margin-top: 22px; font-size: 12.5px; color: rgba(232, 239, 233, 0.5); }

/* ---------- 页脚 ---------- */
.site-footer {
  padding: 46px 0 34px;
  background: var(--c-green-900);
  color: rgba(232, 239, 233, 0.72);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner { display: grid; gap: 24px; text-align: center; }

.footer-brand strong {
  display: block;
  font-size: 19px;
  letter-spacing: 0.04em;
  color: #f2f7f3;
}

.footer-brand p { margin: 6px 0 0; font-size: 13.5px; }

.footer-nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 26px; }

.footer-nav a { font-size: 14px; transition: color .22s var(--ease); }

.footer-nav a:hover { color: var(--c-gold-light); }

.copyright { margin: 0; font-size: 13px; color: rgba(232, 239, 233, 0.48); }

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 880;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  font-size: 18px;
  color: var(--c-white);
  background: linear-gradient(135deg, var(--c-green-700), var(--c-green-800));
  border-radius: 50%;
  box-shadow: 0 8px 24px rgba(27, 67, 50, 0.30);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), visibility .3s var(--ease), transform .3s var(--ease);
}

.back-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- 进场动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}