/* ==========================================================================
   周村区齐景生物质颗粒 — 官网样式（Apple 风格 · 变体 D）
   设计语言：白底居中大字 + promo tile 网格 + 极细线分隔 + 胶囊按钮
   与 A（黑底居中 hero）/ B（浅色分栏 hero）/ C（全出血图 hero）区分
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root {
  /* 背景 */
  --bg-canvas: #ffffff;
  --bg-card: #ffffff;
  --bg-tile: #f5f5f7;
  --bg-warm-tint: #f5f5f7;
  --bg-warm-soft: #e8e8ed;
  --bar-dark: #1d1d1f;

  /* 文字 */
  --ink-primary: #1d1d1f;
  --ink-secondary: #6e6e73;
  --ink-muted: #86868b;
  --ink-on-dark: #f5f5f7;
  --ink-on-dark-soft: #a1a1a6;

  /* 品牌色 */
  --brick: #c7553f;
  --brick-dark: #a8432f;
  --wood: #6e6e73;
  --gold: #c7553f;
  --beige-numeral: #d2d2d7;

  /* 线条 */
  --line-subtle: #d2d2d7;
  --line-dark: #424245;

  /* 深色区块 */
  --panel-dark: #1d1d1f;
  --card-dark: #2d2d2f;

  /* 圆角 */
  --r-sm: 12px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-pill: 980px;

  /* 版心与栅格 */
  --page-max: 1440px;
  --page-pad: 64px;
  --shell: 1312px;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-num: "Inter", "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-primary);
  background: var(--bg-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p, figure, ul, ol {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

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

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

/* ---------- 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding-left: var(--page-pad);
  padding-right: var(--page-pad);
}

.section {
  padding: 96px var(--page-pad);
}

.section--tight {
  padding-top: 56px;
  padding-bottom: 56px;
}

.section--hero {
  padding-top: 72px;
  padding-bottom: 88px;
}

/* ==========================================================================
   导航栏（48px 磨砂玻璃细栏）
   ========================================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 56px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo__mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  display: block;
}

.logo__text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.logo__name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink-primary);
  letter-spacing: 0.2px;
}

.logo__sub {
  display: none;
}

/* 导航链接 */
.nav__links {
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav__link {
  position: relative;
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-primary);
  opacity: 0.82;
  white-space: nowrap;
  padding: 4px 0;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.nav__link:hover {
  color: var(--brick);
  opacity: 1;
}

.nav__link::after {
  display: none;
}

.nav__link.is-active {
  font-weight: 600;
  color: var(--brick);
  opacity: 1;
}

/* 电话按钮（胶囊） */
.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  border-radius: var(--r-pill);
  background: var(--brick);
  color: #fff;
  font-family: var(--font-num);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.2s ease;
}

.nav__cta:hover {
  background: var(--brick-dark);
}

.nav__cta svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* 汉堡菜单 */
.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  flex-shrink: 0;
}

.nav__toggle span {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink-primary);
  border-radius: 2px;
  transition: background 0.2s ease;
}

.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--ink-primary);
  border-radius: 2px;
  transition: transform 0.25s ease, top 0.25s ease;
}

.nav__toggle span::before { top: -6px; }
.nav__toggle span::after  { top: 6px; }

.nav.is-open .nav__toggle span { background: transparent; }
.nav.is-open .nav__toggle span::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav__toggle span::after  { top: 0; transform: rotate(-45deg); }

/* 移动端抽屉 */
.nav__drawer {
  display: none;
  border-top: 1px solid var(--line-subtle);
  background: #fff;
  padding: 8px var(--page-pad) 24px;
}

.nav.is-open .nav__drawer {
  display: block;
}

.nav__drawer a {
  display: block;
  padding: 14px 0;
  font-size: 16px;
  color: var(--ink-primary);
  border-bottom: 1px solid var(--line-subtle);
}

.nav__drawer a.is-active {
  color: var(--brick);
  font-weight: 600;
}

.nav__drawer .nav__cta {
  margin-top: 20px;
  width: 100%;
  justify-content: center;
}

/* ==========================================================================
   页头横幅（内页）— 白底超大左对齐标题
   ========================================================================== */
.pagehead {
  background: #fff;
  padding: 88px var(--page-pad) 64px;
  border-bottom: 1px solid var(--line-subtle);
}

.pagehead__crumb {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 14px;
}

.pagehead__title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  color: var(--ink-primary);
  margin-bottom: 14px;
}

.pagehead__desc {
  font-size: 19px;
  color: var(--ink-secondary);
  max-width: 720px;
}

/* ==========================================================================
   通用标题组（居中）
   ========================================================================== */
.eyebrow {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brick);
}

.sec-title {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  color: var(--ink-primary);
}

.sec-desc {
  font-size: 18px;
  color: var(--ink-secondary);
}

.sec-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  margin-bottom: 48px;
}

.sec-head .sec-desc {
  max-width: 640px;
}

/* ==========================================================================
   按钮（胶囊）
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--r-pill);
  font-size: 16px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: var(--brick);
  color: #fff;
}

.btn--primary:hover {
  background: var(--brick-dark);
}

.btn--ghost {
  background: transparent;
  color: var(--brick);
  border: 0;
  padding-left: 12px;
  padding-right: 12px;
}

.btn--ghost::after {
  content: "›";
  font-size: 20px;
  line-height: 1;
  margin-left: 2px;
}

.btn--ghost:hover {
  text-decoration: underline;
}

.btn--dark {
  background: var(--bar-dark);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  padding: 12px 26px;
}

.btn--dark:hover {
  background: #000;
}

.btn--brick {
  background: var(--brick);
  color: #fff;
  font-size: 15px;
  font-weight: 500;
  padding: 13px 28px;
}

.btn--brick:hover {
  background: var(--brick-dark);
}

/* ==========================================================================
   首页 Hero — 白底居中大字 + 下方大圆角图 tile
   ========================================================================== */
.hero {
  display: block;
  text-align: center;
}

.hero__copy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  max-width: 860px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--r-pill);
  background: var(--bg-tile);
}

.badge__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brick);
  flex-shrink: 0;
}

.badge__text {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-secondary);
  letter-spacing: 0.5px;
}

.hero__title {
  font-size: 68px;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -2px;
  color: var(--ink-primary);
}

.hero__desc {
  font-size: 20px;
  line-height: 1.65;
  color: var(--ink-secondary);
  max-width: 680px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 6px;
}

.hero__trust {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 28px;
  margin-top: 10px;
}

.hero__trust li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-muted);
}

.hero__trust li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--brick);
}

.hero__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 620 / 470;
  background: var(--bg-warm-soft);
  max-width: 980px;
  margin: 56px auto 0;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   数据条 — 白底极简数字行（细线分隔）
   ========================================================================== */
.stats {
  background: #fff;
  padding: 0 var(--page-pad);
}

.stats__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: var(--page-max);
  margin: 0 auto;
  border-top: 1px solid var(--line-subtle);
  border-bottom: 1px solid var(--line-subtle);
  padding: 48px 0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  padding: 0 24px;
  border-left: 1px solid var(--line-subtle);
}

.stat:first-child {
  border-left: 0;
}

.stat__value {
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  color: var(--ink-primary);
}

.stat__label {
  font-size: 14px;
  color: var(--ink-muted);
}

/* ==========================================================================
   产品 tile — 灰底大圆角 tile，图上文下
   ========================================================================== */
.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-tile);
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 0;
  transition: transform 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
}

.card__media {
  height: 230px;
  overflow: hidden;
  background: var(--bg-warm-soft);
}

.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card__media img {
  transform: scale(1.04);
}

.card__body {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  padding: 22px 22px 26px;
  flex: 1;
}

.card__title {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-primary);
}

.card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-secondary);
  flex: 1;
}

.card__spec {
  font-size: 13px;
  font-weight: 600;
  color: var(--brick);
}

/* ==========================================================================
   选型引导区（首页）— 极细线行式列表
   ========================================================================== */
.guide {
  background: var(--bg-tile);
}

.guide__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 20px;
}

.guide__head-left {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guide__head-left .sec-title {
  font-size: 40px;
}

.guide__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 64px;
}

.guide__item {
  display: flex;
  align-items: baseline;
  gap: 24px;
  padding: 26px 4px;
  background: transparent;
  border-radius: 0;
  border-bottom: 1px solid var(--line-subtle);
  transition: none;
}

.guide__item:hover {
  box-shadow: none;
  transform: none;
}

.guide__num {
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--brick);
  flex-shrink: 0;
  width: 34px;
}

.guide__content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.guide__scene {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink-primary);
}

.guide__pick {
  font-size: 15px;
  font-weight: 400;
  color: var(--ink-secondary);
}

/* ==========================================================================
   核心优势区 — 无卡片纯文字四列
   ========================================================================== */
.advantages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.adv {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  padding: 28px 12px 0;
  background: transparent;
  border-radius: 0;
  border: 0;
  border-top: 1px solid var(--line-subtle);
  transition: none;
}

.adv:hover {
  box-shadow: none;
  transform: none;
}

.adv__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--bg-tile);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.adv__icon svg {
  width: 24px;
  height: 24px;
}

.adv__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-primary);
}

.adv__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-secondary);
}

/* ==========================================================================
   常见问题 — 浅灰底白卡手风琴
   ========================================================================== */
.faq-block {
  background: var(--bg-tile);
  color: var(--ink-primary);
}

.faq-block .sec-title {
  color: var(--ink-primary);
}

.faq-block .eyebrow {
  color: var(--brick);
}

.faq-block .sec-desc {
  color: var(--ink-secondary);
}

.faq-block .sec-head {
  margin-bottom: 40px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border-radius: var(--r-md);
  overflow: hidden;
}

.faq-item__q {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 26px 30px;
  text-align: left;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-primary);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  margin-top: 4px;
  border-radius: 50%;
  border: 1.5px solid var(--line-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.28s ease, background 0.2s ease, border-color 0.2s ease;
}

.faq-item__icon svg {
  width: 12px;
  height: 12px;
  stroke: var(--ink-primary);
}

.faq-item.is-open .faq-item__icon {
  transform: rotate(180deg);
  background: var(--brick);
  border-color: var(--brick);
}

.faq-item.is-open .faq-item__icon svg {
  stroke: #fff;
}

.faq-item__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}

.faq-item.is-open .faq-item__panel {
  grid-template-rows: 1fr;
}

.faq-item__panel-inner {
  overflow: hidden;
}

.faq-item__a {
  padding: 0 30px 28px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-secondary);
}

/* 浅色底 FAQ（常见问题内页） */
.faq-list--light .faq-item {
  background: var(--bg-tile);
  border: 0;
}

.faq-list--light .faq-item__q {
  color: var(--ink-primary);
}

.faq-list--light .faq-item__a {
  color: var(--ink-secondary);
}

.faq-list--light .faq-item__icon {
  border-color: var(--line-subtle);
}

.faq-list--light .faq-item__icon svg {
  stroke: var(--ink-primary);
}

/* ==========================================================================
   联系横幅 — 浅灰底居中 + 砖红胶囊电话
   ========================================================================== */
.cta-banner {
  background: #fff;
  border-top: 1px solid var(--line-subtle);
  padding: 96px var(--page-pad);
}

.cta-banner__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 28px;
  max-width: 760px;
  margin: 0 auto;
}

.cta-banner__copy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.cta-banner__title {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -1px;
  color: var(--ink-primary);
}

.cta-banner__desc {
  font-size: 18px;
  color: var(--ink-secondary);
}

.cta-banner__phone {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 34px;
  border-radius: var(--r-pill);
  background: var(--brick);
  flex-shrink: 0;
  transition: background 0.2s ease;
}

.cta-banner__phone:hover {
  background: var(--brick-dark);
}

.cta-banner__phone svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.cta-banner__phone svg path {
  stroke: #fff;
}

.cta-banner__num {
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #fff;
  white-space: nowrap;
}

/* ==========================================================================
   页脚 — 浅灰极简 fine print
   ========================================================================== */
.footer {
  background: var(--bg-tile);
  padding: 48px var(--page-pad) 32px;
  color: var(--ink-primary);
  border-top: 1px solid var(--line-subtle);
}

.footer__inner {
  max-width: var(--page-max);
  margin: 0 auto;
}

.footer__top {
  display: grid;
  grid-template-columns: 420px 1fr 360px;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line-subtle);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer__logo svg {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.footer__logo-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-primary);
}

.footer__intro {
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-muted);
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer__col-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-primary);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__links a,
.footer__contact {
  font-size: 13px;
  color: var(--ink-muted);
  transition: color 0.2s ease;
}

.footer__links a:hover {
  color: var(--brick);
}

.footer__bottom {
  display: flex;
  justify-content: flex-start;
  padding-top: 22px;
}

.footer__icp {
  font-size: 12px;
  color: var(--ink-muted);
}

.footer__icp:hover {
  color: var(--ink-secondary);
  text-decoration: underline;
}

/* ==========================================================================
   关于我们
   ========================================================================== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 560px;
  gap: 64px;
  align-items: center;
}

.about-copy {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.about-copy .sec-title {
  font-size: 38px;
}

.about-copy p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-secondary);
}

.about-points {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 4px;
}

.about-points li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--ink-secondary);
}

.about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--brick);
  border-bottom: 2px solid var(--brick);
  transform: rotate(-45deg);
}

.about-media {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 560 / 420;
  background: var(--bg-warm-soft);
}

.about-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 实力数据 — 灰底 tile */
.strength {
  background: #fff;
}

.strength__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.strength__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 32px 28px;
  border-radius: var(--r-lg);
  background: var(--bg-tile);
}

.strength__value {
  font-family: var(--font-num);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
  color: var(--brick);
}

.strength__label {
  font-size: 14px;
  color: var(--ink-secondary);
}

/* 发展历程 — 细线行式 */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.tl {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 4px 0;
  border-radius: 0;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--line-subtle);
}

.tl__year {
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 700;
  color: var(--brick);
}

.tl__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-primary);
}

.tl__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-secondary);
}

/* ==========================================================================
   产品中心 — 极简线表
   ========================================================================== */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.spec-table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  border-radius: 0;
  overflow: visible;
}

.spec-table th {
  padding: 14px 20px;
  text-align: left;
  background: transparent;
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 1px solid var(--ink-primary);
}

.spec-table td {
  padding: 16px 20px;
  font-size: 15px;
  color: var(--ink-secondary);
  vertical-align: middle;
  border-bottom: 1px solid var(--line-subtle);
  background: transparent;
}

.spec-table tbody tr:nth-child(odd),
.spec-table tbody tr:nth-child(even) {
  background: transparent;
}

.spec-table tbody tr td:first-child {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink-primary);
}

/* 设备区 */
.equip {
  display: grid;
  grid-template-columns: 560px 1fr;
  gap: 64px;
  align-items: center;
}

.equip__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 560 / 400;
  background: var(--bg-warm-soft);
}

.equip__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.equip__copy {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.equip__title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.8px;
  color: var(--ink-primary);
}

.equip__desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-secondary);
}

.equip__points {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.equip__points li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink-primary);
}

.equip__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--brick);
  border-bottom: 2px solid var(--brick);
  transform: rotate(-45deg);
}

/* ==========================================================================
   颗粒选型 — 灰底 tile
   ========================================================================== */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.scene {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 36px;
  border-radius: var(--r-lg);
  background: var(--bg-tile);
  border: 0;
  transition: transform 0.25s ease;
}

.scene:hover {
  transform: translateY(-3px);
  box-shadow: none;
}

.scene__num {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  line-height: 1;
  color: var(--brick);
}

.scene__title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-primary);
}

.scene__desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-secondary);
  flex: 1;
}

.scene__tags {
  font-size: 14px;
  font-weight: 600;
  color: var(--brick);
}

/* 三步走 — 深色 tile */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 32px 30px;
  border-radius: var(--r-lg);
  background: var(--bar-dark);
}

.step__num {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: #a1a1a6;
}

.step__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: #f5f5f7;
}

.step__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-on-dark-soft);
}

/* 家用场景 */
.home-scene {
  display: grid;
  grid-template-columns: 600px 1fr;
  gap: 64px;
  align-items: center;
}

.home-scene__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  aspect-ratio: 600 / 400;
  background: var(--bg-warm-soft);
}

.home-scene__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.home-scene__copy {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.home-scene__title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.8px;
  color: var(--ink-primary);
}

.home-scene__desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-secondary);
}

/* ==========================================================================
   联系我们 — 灰底 tile 卡
   ========================================================================== */
.contact-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.ccard {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 44px 40px;
  border-radius: var(--r-lg);
}

.ccard--phone {
  background: var(--bg-tile);
}

.ccard--addr {
  background: var(--bg-tile);
}

.ccard__icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: #fff;
}

.ccard--phone .ccard__icon {
  background: #fff;
}

.ccard--addr .ccard__icon {
  background: #fff;
}

.ccard__icon svg {
  width: 26px;
  height: 26px;
}

.ccard__label {
  font-size: 15px;
}

.ccard--phone .ccard__label {
  color: var(--ink-secondary);
}

.ccard--addr .ccard__label {
  color: var(--ink-secondary);
}

.ccard__value {
  font-family: var(--font-num);
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
}

.ccard--phone .ccard__value {
  color: var(--brick);
}

.ccard--addr .ccard__value {
  font-family: var(--font-sans);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
  color: var(--ink-primary);
}

.ccard__note {
  font-size: 14px;
}

.ccard--phone .ccard__note {
  color: var(--ink-muted);
}

.ccard--addr .ccard__note {
  color: var(--ink-muted);
}

/* 到访提示 */
.visit-tip {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px 32px;
  border-radius: var(--r-lg);
  background: var(--bg-tile);
  border: 0;
}

.visit-tip__icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.visit-tip__icon svg {
  width: 24px;
  height: 24px;
}

.visit-tip__text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.visit-tip__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-primary);
}

.visit-tip__desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-secondary);
}

/* ==========================================================================
   响应式 — 1180px 以下
   ========================================================================== */
@media (max-width: 1180px) {
  :root {
    --page-pad: 40px;
  }

  .nav__links { gap: 24px; }

  .hero__title { font-size: 52px; }
  .hero__media { max-width: 720px; }

  .cards,
  .advantages,
  .strength__grid,
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .advantages { gap: 20px; }

  .about-intro,
  .equip,
  .home-scene {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .about-media,
  .equip__media,
  .home-scene__media {
    max-width: 640px;
    order: -1;
  }

  .steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer__brand { grid-column: 1 / -1; }
}

/* ==========================================================================
   响应式 — 900px 以下（导航折叠）
   ========================================================================== */
@media (max-width: 900px) {
  :root {
    --page-pad: 28px;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__toggle { display: flex; }

  .section { padding: 64px var(--page-pad); }
  .section--tight { padding-top: 40px; padding-bottom: 40px; }
  .section--hero { padding-top: 48px; padding-bottom: 64px; }

  .pagehead { padding: 56px var(--page-pad) 44px; }
  .pagehead__title { font-size: 40px; }

  .hero__title { font-size: 40px; letter-spacing: -1px; }
  .hero__desc { font-size: 17px; }
  .hero__actions .btn { flex: 1; min-width: 160px; }

  .sec-title { font-size: 32px; }
  .guide__head-left .sec-title { font-size: 32px; }
  .equip__title,
  .home-scene__title { font-size: 28px; }
  .cta-banner__title { font-size: 30px; }
  .cta-banner { padding: 64px var(--page-pad); }

  .stats__inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 28px 0;
    padding: 36px 0;
  }

  .stat:nth-child(odd) {
    border-left: 0;
  }

  .stat:nth-child(n + 3) {
    padding-top: 24px;
    border-top: 1px solid var(--line-subtle);
  }

  .stat__value { font-size: 34px; }

  .guide__head {
    flex-direction: column;
    align-items: flex-start;
  }

  .guide__grid { grid-template-columns: 1fr; gap: 0; }
  .scene-grid { grid-template-columns: 1fr; }
  .contact-cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }

  .cta-banner__phone { width: 100%; justify-content: center; }

  .ccard { padding: 32px 28px; }
  .ccard__value { font-size: 34px; }
  .ccard--addr .ccard__value { font-size: 24px; }

  .faq-item__q { padding: 22px; font-size: 17px; }
  .faq-item__a { padding: 0 22px 22px; }

  .footer__top { grid-template-columns: 1fr; }
  .footer__bottom { justify-content: flex-start; }
}

/* ==========================================================================
   响应式 — 620px 以下（手机）
   ========================================================================== */
@media (max-width: 620px) {
  :root {
    --page-pad: 20px;
  }

  .nav__inner { height: 52px; }
  .logo__mark { width: 26px; height: 26px; }
  .logo__name { font-size: 15px; }

  .section { padding: 48px var(--page-pad); }
  .section--tight { padding-top: 32px; padding-bottom: 32px; }
  .section--hero { padding-top: 36px; padding-bottom: 48px; }

  .pagehead { padding: 40px var(--page-pad) 32px; }
  .pagehead__title { font-size: 30px; }

  .hero__title { font-size: 32px; line-height: 1.25; letter-spacing: -0.5px; }
  .hero__copy { gap: 16px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
  .hero__trust { gap: 16px; }
  .hero__media { margin-top: 36px; aspect-ratio: 4 / 3; }

  .sec-title { font-size: 26px; }
  .guide__head-left .sec-title { font-size: 26px; }
  .sec-head { margin-bottom: 28px; }

  .badge { padding: 7px 14px; }
  .badge__text { font-size: 12px; }

  .cards,
  .advantages,
  .strength__grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .stats { padding: 0 var(--page-pad); }
  .stats__inner { padding: 28px 0; }
  .stat__value { font-size: 28px; }

  .guide__item { padding: 20px 4px; gap: 16px; }
  .guide__num { font-size: 15px; width: 28px; }
  .guide__scene { font-size: 17px; }
  .guide__pick { font-size: 14px; }

  .scene { padding: 26px; }
  .scene__title { font-size: 20px; }

  .adv { padding: 20px 4px 0; }
  .strength__value { font-size: 30px; }

  .equip__title,
  .home-scene__title { font-size: 23px; }
  .cta-banner__title { font-size: 24px; line-height: 1.45; }
  .cta-banner__desc { font-size: 15px; }

  .cta-banner__phone {
    padding: 14px 20px;
    gap: 10px;
  }

  .cta-banner__phone svg { width: 20px; height: 20px; }
  .cta-banner__num { font-size: 21px; }

  .ccard__value { font-size: 30px; }
  .ccard--addr .ccard__value { font-size: 21px; }
  .ccard__icon { width: 48px; height: 48px; }

  .visit-tip {
    flex-direction: column;
    align-items: flex-start;
    padding: 22px;
  }

  .faq-item__q { padding: 18px; font-size: 16px; gap: 14px; }
  .faq-item__a { padding: 0 18px 18px; font-size: 14px; }

  .footer { padding: 36px var(--page-pad) 24px; }
  .footer__top { padding-bottom: 24px; }

  .tl__year { font-size: 21px; }
}

/* ==========================================================================
   打印
   ========================================================================== */
@media print {
  .nav,
  .nav__drawer,
  .cta-banner {
    display: none;
  }

  body {
    background: #fff;
  }
}