/* ============================================================
   诺蔓莉 NUOMANLI 官网 · 样式系统
   ------------------------------------------------------------
   设计令牌
     --ink-deep   #17382F  深林绿  深底 / 页脚 / Hero
     --ink        #2E5A4E  墨绿    品牌主色 / 导航 / 标题
     --ink-body   #37564C  正文墨绿
     --porcelain  #F7F9F6  冷瓷白  页面底色
     --amber      #FF6B00  爱马仕橙 唯一强调色（严格小面积）
     --sage       #A9C7B8  鼠尾草  辅助 / 标注
   铁律
     · 橙仅作强调，单屏不超过 3 处
     · 不使用灰色文字，弱化一律用墨绿降透明度
     · 不使用卡片阴影 / 立体效果，靠留白 + 细线分区
     · 全站零圆角或 2px 微圆角
   ============================================================ */

:root {
  /* —— 色板 —— */
  --ink-deep: #17382F;
  --ink: #2E5A4E;
  --ink-body: #37564C;
  --porcelain: #F7F9F6;
  --paper: #FFFFFF;
  --amber: #FF6B00;
  --amber-soft: #FF8A33;
  --sage: #A9C7B8;

  /* —— 弱化色（墨绿降透明度，禁用灰色）—— */
  --ink-70: rgba(46, 90, 78, .70);
  --ink-55: rgba(46, 90, 78, .55);
  --ink-40: rgba(46, 90, 78, .40);
  --ink-22: rgba(46, 90, 78, .22);
  --ink-12: rgba(46, 90, 78, .12);
  --ink-07: rgba(46, 90, 78, .07);
  --on-dark-70: rgba(247, 249, 246, .70);
  --on-dark-45: rgba(247, 249, 246, .45);
  --on-dark-18: rgba(247, 249, 246, .18);
  --on-dark-10: rgba(247, 249, 246, .10);

  /* —— 字体 —— */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;

  /* —— 栅格与节奏 —— */
  --max: 1240px;
  --gutter: clamp(20px, 5vw, 56px);
  --section-y: clamp(64px, 9vw, 132px);
  --rule: 1px solid var(--ink-12);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ========== 基础重置 ========== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--porcelain);
  color: var(--ink-body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p, figure, blockquote { margin: 0; }
table { border-collapse: collapse; width: 100%; }

::selection { background: var(--amber); color: #fff; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* ========== 排版 ========== */
.display {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.32;
  letter-spacing: .01em;
}
.d-hero   { font-size: clamp(34px, 5.4vw, 66px); line-height: 1.22; }
.d-1      { font-size: clamp(27px, 3.5vw, 44px); }
.d-2      { font-size: clamp(21px, 2.3vw, 29px); }
.d-3      { font-size: clamp(18px, 1.5vw, 21px); line-height: 1.5; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-55);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: var(--amber);
}
.eyebrow.on-dark { color: var(--on-dark-70); }

.lede { font-size: clamp(15px, 1.35vw, 18px); color: var(--ink-70); line-height: 2; }
.body-sm { font-size: 14px; color: var(--ink-55); line-height: 1.95; }
.amber { color: var(--amber); }

/* ========== 布局 ========== */
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.wrap-narrow { max-width: 860px; margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: var(--section-y) 0; }
.section--tight { padding: clamp(48px, 6vw, 88px) 0; }
.section--dark { background: var(--ink-deep); color: var(--porcelain); }
.section--dark .display { color: var(--porcelain); }
.section--dark .lede { color: var(--on-dark-70); }
.section--paper { background: var(--paper); }

.grid { display: grid; gap: clamp(28px, 4vw, 56px); }
.g-2 { grid-template-columns: repeat(2, 1fr); }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }

.sec-head { max-width: 720px; margin-bottom: clamp(40px, 5vw, 72px); }
.sec-head .d-1 { margin: 18px 0 20px; }

.rule { height: 1px; background: var(--ink-12); border: 0; margin: 0; }
.rule--dark { background: var(--on-dark-18); }

/* ========== 顶栏 ========== */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(247, 249, 246, .86);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--ink-12); }
.nav.is-dark {
  background: rgba(14, 33, 29, .82);
  border-bottom-color: var(--on-dark-10);
  color: var(--porcelain);
}
.nav__inner {
  max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter);
  height: 74px; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: baseline; gap: 10px; flex-shrink: 0; }
.brand__mark {
  font-family: var(--font-display);
  font-size: 25px; font-weight: 700; letter-spacing: .06em;
  color: var(--ink);
}
.nav.is-dark .brand__mark { color: var(--porcelain); }
.brand__mark i { font-style: normal; color: var(--amber); }
.brand__latin {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: .3em;
  color: var(--ink-40); text-transform: uppercase;
}
.nav.is-dark .brand__latin { color: var(--on-dark-45); }

.nav__links { margin-left: auto; display: flex; gap: clamp(14px, 2vw, 34px); }
.nav__links a {
  font-size: 14.5px; color: var(--ink-70); padding: 6px 0;
  position: relative; white-space: nowrap;
  transition: color .25s var(--ease);
}
.nav.is-dark .nav__links a { color: var(--on-dark-70); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--amber); transition: width .3s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav.is-dark .nav__links a:hover { color: var(--porcelain); }
.nav__links a:hover::after,
.nav__links a.is-active::after { width: 100%; }
.nav__links a.is-active { color: var(--ink); }
.nav.is-dark .nav__links a.is-active { color: var(--porcelain); }

.nav__cta {
  flex-shrink: 0; display: inline-flex; align-items: center;
  background: var(--ink); color: var(--porcelain);
  padding: 10px 22px; font-size: 14px; letter-spacing: .04em;
  transition: background .25s var(--ease);
}
.nav.is-dark .nav__cta { background: var(--amber); color: #fff; }
.nav__cta:hover { background: var(--amber); color: #fff; }

.nav__toggle { display: none; margin-left: auto; width: 40px; height: 40px; position: relative; }
.nav__toggle span {
  position: absolute; left: 9px; width: 22px; height: 1.5px; background: var(--ink);
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav.is-dark .nav__toggle span { background: var(--porcelain); }
.nav__toggle span:nth-child(1) { top: 15px; }
.nav__toggle span:nth-child(2) { top: 21px; }
.nav__toggle span:nth-child(3) { top: 27px; }
.nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ========== 按钮 ========== */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 32px; font-size: 15px; letter-spacing: .04em;
  border: 1px solid var(--ink); color: var(--ink);
  transition: background .28s var(--ease), color .28s var(--ease), border-color .28s var(--ease);
}
.btn:hover { background: var(--ink); color: var(--porcelain); }
.btn__arrow { transition: transform .28s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(5px); }
.btn--solid { background: var(--ink); color: var(--porcelain); }
.btn--solid:hover { background: var(--amber); border-color: var(--amber); color: #fff; }
.btn--amber { background: var(--amber); border-color: var(--amber); color: #fff; }
.btn--amber:hover { background: #E85F00; border-color: #E85F00; color: #fff; }
.btn--on-dark { border-color: var(--on-dark-45); color: var(--porcelain); }
.btn--on-dark:hover { background: var(--amber); border-color: var(--amber); color: #fff; }

/* ========== Hero ========== */
.hero {
  position: relative; overflow: hidden;
  background: var(--ink-deep); color: var(--porcelain);
  padding: calc(74px + clamp(48px, 7vw, 96px)) 0 clamp(56px, 8vw, 104px);
}
.hero__glow {
  position: absolute; pointer-events: none;
  width: 900px; height: 900px; right: -240px; top: -320px;
  background: radial-gradient(circle, rgba(255,107,0,.16) 0%, rgba(255,107,0,0) 62%);
}
.hero__grid-lines {
  position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(to right, var(--on-dark-10) 1px, transparent 1px),
    linear-gradient(to bottom, var(--on-dark-10) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(ellipse 80% 60% at 70% 30%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 70% 30%, #000 0%, transparent 75%);
}
.hero__inner {
  position: relative;
  display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  gap: clamp(32px, 5vw, 72px); align-items: center;
}
.hero .display { color: var(--porcelain); }
.hero__title { margin: 22px 0 26px; }
.hero__title em {
  font-style: normal; color: var(--amber);
  position: relative; white-space: nowrap;
}
.hero__lede { color: var(--on-dark-70); max-width: 30em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; }
.hero__meta {
  display: flex; flex-wrap: wrap; gap: 28px; margin-top: 48px;
  padding-top: 30px; border-top: 1px solid var(--on-dark-18);
}
.hero__meta div { min-width: 84px; }
.hero__meta dt {
  font-family: var(--font-display); font-size: 26px; font-weight: 600;
  color: var(--porcelain); line-height: 1.2;
}
.hero__meta dd {
  margin: 6px 0 0; font-size: 12.5px; color: var(--on-dark-45);
  letter-spacing: .06em;
}

/* ========== 皮肤断层可视化（全站 signature） ========== */
.skindiag {
  position: relative;
  background: rgba(255, 255, 255, .022);
  border: 1px solid var(--on-dark-18);
  padding: clamp(16px, 2.4vw, 28px);
}
.skindiag__head {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 16px; margin-bottom: 14px; padding-bottom: 12px;
  border-bottom: 1px solid var(--on-dark-18);
}
.skindiag__title {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--on-dark-70);
}
.skindiag__scale { font-family: var(--font-mono); font-size: 10.5px; color: var(--amber); }
.skindiag svg { width: 100%; height: auto; overflow: visible; }
.skindiag__labels { margin-top: 16px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.skindiag__labels div { border-top: 1px solid var(--on-dark-18); padding-top: 9px; }
.skindiag__labels b {
  display: block; font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .14em; color: var(--amber); margin-bottom: 3px;
}
.skindiag__labels span { font-size: 12px; color: var(--on-dark-45); line-height: 1.6; }
.skindiag__foot {
  margin-top: 16px; font-size: 12.5px; color: var(--on-dark-45); line-height: 1.8;
  padding-top: 12px; border-top: 1px solid var(--on-dark-18);
}
.skindiag__foot strong { color: var(--porcelain); font-weight: 500; }

.layer-label { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .1em; fill: var(--on-dark-45); }
.layer-depth { font-family: var(--font-mono); font-size: 9px; fill: rgba(245,246,243,.3); }
.layer-name { font-size: 11px; fill: rgba(245,246,243,.72); }
.layer-rule { stroke: rgba(245,246,243,.14); stroke-width: 1; }
.particle { fill: var(--amber); }
.keratino { fill: rgba(155,179,168,.22); }

/* ========== 数据条 ========== */
.stats { background: var(--paper); border-top: var(--rule); border-bottom: var(--rule); }
.stats__grid { display: grid; grid-template-columns: repeat(5, 1fr); }
.stats__item { padding: clamp(28px, 3.6vw, 44px) clamp(14px, 2vw, 30px); border-left: var(--rule); }
.stats__item:first-child { border-left: 0; }
.stats__num {
  font-family: var(--font-display); font-size: clamp(24px, 2.9vw, 38px);
  font-weight: 600; color: var(--ink); line-height: 1.1;
  display: flex; align-items: baseline; gap: 2px;
}
.stats__num small { font-size: .42em; font-weight: 500; color: var(--ink-55); }
.stats__label { margin-top: 10px; font-size: 12.5px; color: var(--ink-55); line-height: 1.7; }

/* ========== 通用列表块 ========== */
.feature { border-top: 1px solid var(--ink-22); padding-top: 22px; }
.feature__no {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em;
  color: var(--amber); margin-bottom: 12px;
}
.feature__title {
  font-family: var(--font-display); font-size: clamp(17px, 1.55vw, 20px);
  font-weight: 600; color: var(--ink); margin-bottom: 10px; line-height: 1.5;
}
.feature__text { font-size: 14.5px; color: var(--ink-70); line-height: 1.95; }
.section--dark .feature { border-top-color: var(--on-dark-18); }
.section--dark .feature__title { color: var(--porcelain); }
.section--dark .feature__text { color: var(--on-dark-70); }

.tag {
  display: inline-block; font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: .12em; color: var(--ink-55); border: 1px solid var(--ink-22);
  padding: 4px 11px; margin: 0 6px 6px 0;
}
.tag--amber { color: var(--amber); border-color: rgba(255,107,0,.4); }
.section--dark .tag { color: var(--on-dark-70); border-color: var(--on-dark-18); }
.section--dark .tag--amber { color: var(--amber); border-color: rgba(255,107,0,.45); }

/* ========== 方案矩阵表 ========== */
.matrix { width: 100%; border-top: 1px solid var(--ink-22); }
.matrix th, .matrix td {
  text-align: left; padding: 20px 18px; vertical-align: top;
  border-bottom: 1px solid var(--ink-12); font-size: 14.5px;
}
.matrix th {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-55); font-weight: 400;
  border-bottom: 1px solid var(--ink-22); padding-bottom: 14px;
}
.matrix tbody tr { transition: background .25s var(--ease); }
.matrix tbody tr:hover { background: rgba(46, 90, 78, .035); }
.matrix td:first-child {
  font-family: var(--font-display); font-weight: 600; color: var(--ink);
  font-size: 16px; white-space: nowrap;
}
.matrix td:nth-child(2) { color: var(--ink-70); }
.matrix td:last-child { color: var(--ink-70); }
.matrix__arrow { color: var(--amber); padding: 0 8px; }

/* ========== 产品 ========== */
.products-filter {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: clamp(32px, 4vw, 52px);
  padding-bottom: 20px; border-bottom: var(--rule);
}
.filter-btn {
  font-size: 14px; color: var(--ink-55); padding: 8px 18px;
  border: 1px solid var(--ink-12); transition: all .25s var(--ease);
}
.filter-btn:hover { color: var(--ink); border-color: var(--ink-22); }
.filter-btn.is-active { background: var(--ink); border-color: var(--ink); color: var(--porcelain); }

.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--ink-12); }
.product {
  background: var(--porcelain); padding: clamp(24px, 3vw, 40px) clamp(20px, 2.4vw, 34px);
  display: flex; flex-direction: column;
  transition: background .35s var(--ease);
  position: relative;
}
.product:hover { background: var(--paper); }
.product__figure {
  height: 230px; display: flex; align-items: center; justify-content: center;
  margin-bottom: 26px; position: relative;
}
.product__figure img {
  max-height: 100%; width: auto; object-fit: contain;
  transition: transform .5s var(--ease);
  filter: drop-shadow(0 18px 26px rgba(14, 33, 29, .07));
}
.product:hover .product__figure img { transform: translateY(-6px) scale(1.03); }
.product__line {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em;
  color: var(--amber); margin-bottom: 10px;
}
.product__name {
  font-family: var(--font-display); font-size: 20px; font-weight: 600;
  color: var(--ink); line-height: 1.45; margin-bottom: 6px;
}
.product__spec { font-size: 12.5px; color: var(--ink-40); margin-bottom: 14px; }
.product__desc { font-size: 14px; color: var(--ink-70); line-height: 1.9; }
.product__tech {
  margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--ink-12);
  font-size: 13px; color: var(--ink-55); line-height: 1.85;
}
.product__tech b { color: var(--ink); font-weight: 500; }
.product__price {
  margin-top: auto; padding-top: 20px;
  font-family: var(--font-display); font-size: 17px; color: var(--ink);
  display: flex; align-items: baseline; gap: 8px;
}
.product__price small { font-family: var(--font-body); font-size: 11.5px; color: var(--ink-40); }
.product__badge {
  position: absolute; top: 0; right: 0;
  background: var(--amber); color: #fff;
  font-size: 11px; letter-spacing: .08em; padding: 5px 12px;
}

/* ========== 橙光计划 · 四套系统 ========== */
.engine {
  display: grid; grid-template-columns: 92px 1fr; gap: clamp(18px, 2.6vw, 34px);
  padding: clamp(28px, 3.4vw, 42px) 0; border-top: 1px solid var(--on-dark-18);
}
.engine:last-child { border-bottom: 1px solid var(--on-dark-18); }
.engine__no {
  font-family: var(--font-display); font-size: clamp(38px, 5vw, 62px);
  font-weight: 600; color: rgba(255,107,0,.32); line-height: 1;
}
.engine__title {
  font-family: var(--font-display); font-size: clamp(19px, 1.9vw, 25px);
  font-weight: 600; color: var(--porcelain); margin-bottom: 6px;
}
.engine__fix {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  color: var(--amber); margin-bottom: 14px;
}
.engine__text { color: var(--on-dark-70); font-size: 14.5px; line-height: 2; max-width: 52em; }
.engine__list { margin-top: 16px; display: grid; gap: 9px; }
.engine__list li {
  position: relative; padding-left: 18px; font-size: 14px; color: var(--on-dark-70);
}
.engine__list li::before {
  content: ""; position: absolute; left: 0; top: 12px;
  width: 6px; height: 1px; background: var(--amber);
}

/* ========== 步骤流程 ========== */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--ink-12); }
.step { background: var(--porcelain); padding: clamp(24px, 3vw, 38px) clamp(18px, 2vw, 30px); }
.step__no {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em;
  color: var(--amber); margin-bottom: 16px;
}
.step__title {
  font-family: var(--font-display); font-size: 17.5px; font-weight: 600;
  color: var(--ink); margin-bottom: 10px; line-height: 1.5;
}
.step__text { font-size: 14px; color: var(--ink-70); line-height: 1.9; }

/* ========== 资质墙 ========== */
.certs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--ink-12); border: 1px solid var(--ink-12); }
.cert { background: var(--porcelain); padding: clamp(22px, 2.6vw, 34px); }
.cert__no {
  font-family: var(--font-mono); font-size: 12px; color: var(--amber);
  letter-spacing: .1em; margin-bottom: 10px;
}
.cert__name { font-size: 15px; color: var(--ink); line-height: 1.65; margin-bottom: 6px; }
.cert__note { font-size: 12.5px; color: var(--ink-40); line-height: 1.75; }

.patents { display: grid; gap: 0; border-top: 1px solid var(--ink-22); }
.patent {
  display: grid; grid-template-columns: 1fr 200px 130px; gap: 20px; align-items: center;
  padding: 18px 0; border-bottom: 1px solid var(--ink-12);
}
.patent__name { font-size: 14.5px; color: var(--ink); }
.patent__no { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-55); }
.patent__use { font-size: 12.5px; color: var(--ink-40); text-align: right; }

/* ========== 背书条 ========== */
.endorse {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--on-dark-18);
  border: 1px solid var(--on-dark-18);
}
.endorse div { background: var(--ink-deep); padding: clamp(22px, 2.8vw, 34px) clamp(14px, 1.8vw, 26px); }
.endorse dt {
  font-family: var(--font-display); font-size: 16px; color: var(--porcelain);
  margin-bottom: 8px; line-height: 1.5;
}
.endorse dd { margin: 0; font-size: 12.5px; color: var(--on-dark-45); line-height: 1.8; }

/* ========== CTA ========== */
.cta { background: var(--ink-deep); color: var(--porcelain); padding: clamp(60px, 8vw, 104px) 0; }
.cta__inner { display: grid; grid-template-columns: 1.3fr auto; gap: 40px; align-items: center; }
.cta .display { color: var(--porcelain); }
.cta__text { color: var(--on-dark-70); margin-top: 16px; max-width: 34em; }

/* ========== 页脚 ========== */
.footer { background: var(--ink-deep); color: var(--on-dark-70); padding: clamp(48px, 6vw, 80px) 0 32px; border-top: 1px solid var(--on-dark-10); }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: clamp(24px, 3vw, 48px); }
.footer__brand .brand__mark { color: var(--porcelain); }
.footer__slogan {
  font-family: var(--font-display); font-size: 15px; color: var(--porcelain);
  margin: 18px 0 12px; letter-spacing: .04em;
}
.footer__text { font-size: 13px; color: var(--on-dark-45); line-height: 2; }
.footer h4 {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--on-dark-45); margin-bottom: 18px; font-weight: 400;
}
.footer li { margin-bottom: 11px; }
.footer li a { font-size: 13.5px; color: var(--on-dark-70); transition: color .25s var(--ease); }
.footer li a:hover { color: var(--amber); }
.footer__bottom {
  margin-top: clamp(36px, 4vw, 56px); padding-top: 24px;
  border-top: 1px solid var(--on-dark-18);
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12px; color: var(--on-dark-45);
}

/* ========== 内页头部 ========== */
.pagehead {
  background: var(--ink-deep); color: var(--porcelain);
  padding: calc(74px + clamp(40px, 6vw, 82px)) 0 clamp(48px, 6vw, 88px);
  position: relative; overflow: hidden;
}
.pagehead::after {
  content: ""; position: absolute; pointer-events: none;
  width: 700px; height: 700px; right: -220px; top: -300px;
  background: radial-gradient(circle, rgba(255,107,0,.13) 0%, rgba(255,107,0,0) 60%);
}
.pagehead .display { color: var(--porcelain); position: relative; }
.pagehead h1 { margin: 20px 0 0; }
.pagehead__lede {
  position: relative; margin-top: 22px; max-width: 40em;
  color: var(--on-dark-70); font-size: clamp(14.5px, 1.3vw, 17.5px); line-height: 2;
}

/* ========== 分层深度图 ========== */
.depth { background: var(--paper); border: 1px solid var(--ink-12); padding: clamp(18px, 2.6vw, 34px); }
.depth svg { width: 100%; height: auto; }

/* ========== 时间线 ========== */
.timeline { border-top: 1px solid var(--ink-22); }
.timeline__item {
  display: grid; grid-template-columns: 150px 1fr; gap: clamp(20px, 3vw, 48px);
  padding: clamp(24px, 3vw, 38px) 0; border-bottom: 1px solid var(--ink-12);
}
.timeline__year {
  font-family: var(--font-display); font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 600; color: var(--ink); line-height: 1.1;
}
.timeline__year span { font-size: .5em; margin-left: 4px; color: var(--amber); }
.timeline__title {
  font-family: var(--font-display); font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 600; color: var(--ink); margin-bottom: 10px;
}
.timeline__text { font-size: 14.5px; color: var(--ink-70); line-height: 1.95; max-width: 46em; }

/* ========== 收益测算 ========== */
.calc { margin-top: clamp(40px, 5vw, 64px); border: 1px solid var(--ink-12); background: var(--paper); }
.calc__head {
  padding: 16px clamp(20px, 2.4vw, 32px); border-bottom: 1px solid var(--ink-22);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em;
  color: var(--amber); text-transform: uppercase;
}
.calc__row {
  display: grid; grid-template-columns: 1fr auto auto; gap: 20px; align-items: baseline;
  padding: 16px clamp(20px, 2.4vw, 32px); border-bottom: 1px solid var(--ink-12);
  font-size: 14.5px; color: var(--ink-body);
}
.calc__note { font-size: 12.5px; color: var(--ink-40); }
.calc__row b { font-family: var(--font-display); font-size: 18px; color: var(--ink); }
.calc__row--total { background: rgba(46, 90, 78, .04); border-bottom: 0; padding: 20px clamp(20px, 2.4vw, 32px) 22px; }
.calc__row--total b { font-size: 26px; color: var(--amber); }

/* ========== 表单 ========== */
.form { display: grid; gap: 22px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.field { display: grid; gap: 9px; }
.field__label { font-size: 13px; color: var(--ink-70); letter-spacing: .04em; }
.field__label i { font-style: normal; color: var(--amber); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 15px; color: var(--ink-body);
  background: var(--paper); border: 1px solid var(--ink-22);
  padding: 14px 16px; width: 100%; line-height: 1.7;
  transition: border-color .25s var(--ease);
  -webkit-appearance: none; appearance: none; border-radius: 0;
}
.field select {
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-55) 50%),
                    linear-gradient(135deg, var(--ink-55) 50%, transparent 50%);
  background-position: calc(100% - 20px) 22px, calc(100% - 14px) 22px;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--ink);
}
.field input.is-error, .field select.is-error { border-color: var(--amber); }
.field ::placeholder { color: var(--ink-40); }

.form__actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 6px; }
.form__result {
  border: 1px solid var(--ink-22); background: var(--paper);
  padding: clamp(20px, 2.6vw, 30px); display: grid; gap: 16px;
}
.form__result-head {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .14em;
  color: var(--amber);
}
.form__result textarea {
  font-family: var(--font-mono); font-size: 13px; line-height: 1.85;
  color: var(--ink-body); background: var(--porcelain);
  border: 1px solid var(--ink-12); padding: 14px 16px; width: 100%; resize: vertical;
}
.form__result-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ========== FAQ ========== */
.faq { border-top: 1px solid var(--ink-22); }
.faq__item { border-bottom: 1px solid var(--ink-12); }
.faq__item summary {
  list-style: none; cursor: pointer; padding: 22px 34px 22px 0; position: relative;
  font-family: var(--font-display); font-size: clamp(16px, 1.5vw, 18.5px);
  font-weight: 600; color: var(--ink); line-height: 1.6;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: ""; position: absolute; right: 6px; top: 34px;
  width: 12px; height: 1.5px; background: var(--amber);
  transition: transform .3s var(--ease);
}
.faq__item summary::before {
  content: ""; position: absolute; right: 11px; top: 29px;
  width: 1.5px; height: 12px; background: var(--amber);
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.faq__item[open] summary::before { transform: rotate(90deg); opacity: 0; }
.faq__item p {
  padding: 0 34px 26px 0; font-size: 14.5px; color: var(--ink-70); line-height: 2;
}

/* ========== 免责说明 ========== */
.disclaimer {
  margin-top: clamp(32px, 4vw, 48px); padding-top: 20px;
  border-top: 1px solid var(--on-dark-18);
  font-size: 12.5px; color: var(--on-dark-45); line-height: 2; max-width: 62em;
}
.section:not(.section--dark) .disclaimer { border-top-color: var(--ink-12); color: var(--ink-40); }

/* ========== 滚动动效 ========== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
/* ============================================================
   GEO 组件 · 面向 AI 检索与引用优化
   keypoints 要点速览 / qa 问答块 / defbox 定义框 / qaindex 索引
   ============================================================ */

/* ---------- 要点速览（摘要块，AI 摘录率最高） ---------- */
.keypoints {
  background: var(--paper);
  border-left: 3px solid var(--amber);
  padding: clamp(22px, 2.6vw, 34px) clamp(22px, 3vw, 40px);
  margin: clamp(26px, 3vw, 42px) 0;
}
.keypoints__title {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--amber); margin-bottom: 16px;
}
.keypoints ul li {
  position: relative; padding-left: 20px; margin-bottom: 12px;
  line-height: 1.9; font-size: 15px; color: var(--ink-body);
}
.keypoints ul li:last-child { margin-bottom: 0; }
.keypoints ul li::before {
  content: ""; position: absolute; left: 0; top: .78em;
  width: 7px; height: 7px; background: var(--amber);
}
.section--dark .keypoints { background: rgba(247, 249, 246, .05); border-left-color: var(--amber); }
.section--dark .keypoints ul li { color: var(--on-dark-70); }

/* ---------- 定义框（术语定义，AI 优先引用） ---------- */
.defbox {
  background: rgba(46, 90, 78, .045);
  border: 1px solid var(--ink-12);
  padding: clamp(24px, 2.8vw, 38px);
  margin: clamp(24px, 3vw, 38px) 0;
}
.defbox__term {
  font-family: var(--font-display); font-size: clamp(17px, 2.1vw, 23px);
  font-weight: 600; color: var(--ink); margin: 0 0 14px; line-height: 1.5;
}
.defbox__term span {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em;
  color: var(--amber); display: block; margin-bottom: 10px; text-transform: uppercase;
}
.defbox p { font-size: 15.5px; line-height: 2; color: var(--ink-body); margin-bottom: 14px; }
.defbox p:last-child { margin-bottom: 0; }

/* ---------- 问答块 ---------- */
.qa {
  border-top: 1px solid var(--ink-22);
  margin-top: clamp(30px, 4vw, 48px);
}
.qa__item {
  border-bottom: 1px solid var(--ink-12);
  padding: clamp(26px, 3.2vw, 40px) 0;
}
.qa__item:last-child { border-bottom: 0; }
.qa__q {
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px); font-weight: 600;
  color: var(--ink); margin: 0 0 16px; line-height: 1.6;
}
.qa__q::before {
  content: "Q"; font-family: var(--font-mono); font-size: 12px;
  color: var(--amber); margin-right: 12px; letter-spacing: .1em;
  vertical-align: 2px;
}
.qa__a { max-width: 64em; }
.qa__a p { font-size: 15.5px; line-height: 2; margin-bottom: 14px; color: var(--ink-body); }
.qa__a p:last-child { margin-bottom: 0; }
.qa__a strong { color: var(--ink); font-weight: 600; }
.qa__a ul { margin: 14px 0; }
.qa__a ul li {
  position: relative; padding-left: 20px; margin-bottom: 10px;
  font-size: 15px; line-height: 1.9;
}
.qa__a ul li::before {
  content: ""; position: absolute; left: 0; top: .8em;
  width: 6px; height: 1px; background: var(--sage);
}

/* ---------- 问答索引 ---------- */
.qaindex {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr));
  gap: 12px 28px; padding: clamp(24px, 3vw, 36px);
  background: var(--paper); border: 1px solid var(--ink-12);
  margin-top: clamp(24px, 3vw, 36px);
}
.qaindex a {
  font-size: 14.5px; color: var(--ink-70); line-height: 1.7;
  border-bottom: 1px solid transparent; padding-bottom: 1px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.qaindex a:hover { color: var(--amber); border-bottom-color: var(--amber); }

/* ---------- 段落首句强调（答案优先） ---------- */
.answer-first {
  font-size: 16.5px; line-height: 2; color: var(--ink);
  font-weight: 500; margin-bottom: 18px;
}

/* ---------- 锚点偏移（固定导航） ---------- */
[id] { scroll-margin-top: 90px; }

/* ---------- 响应式 ---------- */
@media (max-width: 680px) {
  .qaindex { grid-template-columns: 1fr; }
  .keypoints { padding: 20px 18px; }
}

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

/* ========== 响应式 ========== */
@media (max-width: 1080px) {
  .stats__grid { grid-template-columns: repeat(3, 1fr); }
  .stats__item:nth-child(4) { border-left: 0; }
  .stats__item:nth-child(n+4) { border-top: var(--rule); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .certs { grid-template-columns: repeat(2, 1fr); }
  .patent { grid-template-columns: 1fr 170px; }
  .patent__use { grid-column: 1 / -1; text-align: left; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav__links {
    position: fixed; inset: 74px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--porcelain); border-bottom: 1px solid var(--ink-12);
    padding: 8px var(--gutter) 24px;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity .28s var(--ease), transform .28s var(--ease);
  }
  .nav.is-dark .nav__links { background: var(--ink-deep); }
  .nav.is-open .nav__links { opacity: 1; transform: none; pointer-events: auto; }
  .nav__links a { padding: 15px 0; font-size: 16px; border-bottom: 1px solid var(--ink-12); }
  .nav.is-dark .nav__links a { border-bottom-color: var(--on-dark-10); }
  .nav__links a::after { display: none; }
  .nav__toggle { display: block; }
  .nav__cta { display: none; }

  .hero__inner { grid-template-columns: 1fr; }
  .hero__glow { right: -400px; }
  .g-2, .g-3, .g-4 { grid-template-columns: 1fr; }
  .cta__inner { grid-template-columns: 1fr; }
  .section--dark .g-2, .section--dark .g-3, .section--dark .g-4 { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  body { font-size: 15.5px; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stats__item { border-left: 0; }
  .stats__item:nth-child(even) { border-left: var(--rule); }
  .stats__item:nth-child(n+3) { border-top: var(--rule); }
  .products-grid { grid-template-columns: 1fr; }
  .steps, .certs, .endorse { grid-template-columns: 1fr; }
  .skindiag__labels { grid-template-columns: 1fr; }
  .engine { grid-template-columns: 1fr; gap: 10px; }
  .engine__no { font-size: 40px; }
  .footer__grid { grid-template-columns: 1fr; }
  .matrix { display: block; }
  .matrix thead { display: none; }
  .matrix tbody, .matrix tr, .matrix td { display: block; width: 100%; }
  .matrix tr { border-bottom: 1px solid var(--ink-22); padding: 18px 0; }
  .matrix td { padding: 4px 0; border: 0; }
  .matrix td:first-child { margin-bottom: 6px; }
  .matrix td:last-child::before { content: "核心产品："; color: var(--ink-40); }
  .hero__actions .btn { flex: 1 1 100%; justify-content: center; }
  .form__row { grid-template-columns: 1fr; }
  .timeline__item { grid-template-columns: 1fr; gap: 10px; }
  .calc__row { grid-template-columns: 1fr; gap: 6px; }
  .calc__row b { font-size: 20px; }
  .calc__row--total b { font-size: 24px; }
  .calc__note { order: 3; }
  .faq__item summary { padding-right: 30px; }
}

@media (max-width: 980px) {
  .steps[style*="repeat(3"] { grid-template-columns: repeat(2, 1fr) !important; }
}
@media (max-width: 680px) {
  .steps[style*="repeat(3"] { grid-template-columns: 1fr !important; }
}