/* ==================== CSS Variables ==================== */
:root {
  --c-accent: #A9CD0B;        /* 主强调色 */
  --c-accent-hover: #8EAF09;  /* hover */
  --c-accent-active: #789407; /* active 按压 */
  --c-dark-bg: #272C30;       /* 导航/Banner/Footer深色 */
  --c-footer: #1F2327;        /* Footer 底色 */
  --c-title: #1F2327;         /* 标题深色 */
  --c-body: #4A4F53;          /* 正文 */
  --c-muted: #72777B;         /* 辅助浅文字 */
  --c-bg: #F6F7F8;            /* 页面全局背景 */
  --c-card: #FFFFFF;          /* 卡片底色 */
  --c-border: #E4E7EA;        /* 卡片边框/分割线 */
  --c-nav-text: #D1D5D8;      /* 导航默认文字 */

  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1200px;
}

/* ==================== Reset ==================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--c-bg);
  color: var(--c-body);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; height: auto; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

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

/* ==================== Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
}
.btn--primary {
  background: var(--c-accent);
  color: #1F2327;
}
.btn--primary:hover {
  background: var(--c-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(169, 205, 11, 0.3);
}
.btn--primary:active {
  background: var(--c-accent-active);
  transform: translateY(0);
}
.btn--ghost {
  background: transparent;
  color: #FFFFFF;
  border: 1.5px solid rgba(255,255,255,0.4);
}
.btn--ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}
.btn--lg { padding: 16px 40px; font-size: 16px; }
.btn--outline {
  background: transparent;
  color: var(--c-title);
  border: 1.5px solid var(--c-border);
}
.btn--outline:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* ==================== Header / Nav ==================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--c-dark-bg);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo__img {
  width: 80px;
  height: 60px;
  object-fit: contain;
  display: block;
  flex-shrink: 0;
}
.logo__text {
  font-size: 20px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.5px;
}
.logo__text span {
  color: var(--c-accent);
}

.nav { margin-left: auto; margin-right: 32px; }
.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__item { position: relative; }
.nav__link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-nav-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition);
  position: relative;
}
.nav__link:hover { color: #FFFFFF; }
.nav__link--active {
  color: #FFFFFF;
}
.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
}
.nav__arrow { transition: transform var(--transition); }
.nav__item--has-dropdown:hover .nav__arrow { transform: rotate(180deg); }

/* Dropdown */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background: var(--c-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--c-border);
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition);
  z-index: 10;
}
.nav__item--has-dropdown:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown li a {
  display: block;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--c-body);
  transition: all var(--transition);
}
.dropdown li a:hover {
  color: var(--c-accent);
  background: var(--c-bg);
  padding-left: 24px;
}

.header__cta { padding: 10px 22px; font-size: 14px; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  z-index: 1001;
}
.hamburger span {
  width: 26px;
  height: 2.5px;
  background: #FFFFFF;
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ==================== Banner ==================== */
.banner {
  position: relative;
  margin-top: 84px;
  height: 600px;
  overflow: hidden;
  background: var(--c-dark-bg);
}
.banner__track {
  position: relative;
  width: 100%;
  height: 100%;
}
.banner__slide {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}
.banner__slide--active {
  opacity: 1;
  visibility: visible;
}
.banner__content {
  max-width: 640px;
}
.banner__tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
  letter-spacing: 1px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease 0.1s both;
}
.banner__title {
  font-size: 52px;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease 0.2s both;
}
.banner__desc {
  font-size: 17px;
  color: rgba(255,255,255,0.8);
  line-height: 1.7;
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease 0.3s both;
}
.banner__actions {
  display: flex;
  gap: 16px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Banner dots */
.banner__dots {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 5;
}
.banner__dot {
  width: 36px;
  height: 4px;
  background: rgba(255,255,255,0.3);
  border-radius: 2px;
  transition: all var(--transition);
}
.banner__dot--active {
  background: var(--c-accent);
  width: 48px;
}

/* Banner arrows */
.banner__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  z-index: 5;
}
.banner__arrow:hover {
  background: var(--c-accent);
  color: #1F2327;
}
.banner__arrow--prev { left: 32px; }
.banner__arrow--next { right: 32px; }

/* ==================== Stats Bar ==================== */
.stats-bar {
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
}
.stats-bar__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 40px 24px;
}
.stat-item {
  text-align: center;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: var(--c-border);
}
.stat-item__num {
  font-size: 38px;
  font-weight: 800;
  color: var(--c-title);
  line-height: 1;
}
.stat-item__num::after {
  content: '+';
  color: var(--c-accent);
}
.stat-item__label {
  font-size: 14px;
  color: var(--c-muted);
  margin-top: 8px;
}

/* ==================== Section Common ==================== */
.section {
  padding: 80px 0;
}
.section__head {
  text-align: center;
  margin-bottom: 48px;
}
.section__head--row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  text-align: left;
}
.section__tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
  letter-spacing: 1px;
  margin-bottom: 12px;
}
.section__title {
  font-size: 32px;
  font-weight: 700;
  color: var(--c-title);
  letter-spacing: -0.5px;
}
.section__desc {
  font-size: 16px;
  color: var(--c-muted);
  margin-top: 12px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-accent);
  transition: gap var(--transition);
}
.link-more:hover { gap: 10px; }

/* ==================== Products ==================== */
.products__filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}
.filter-btn {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-body);
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  transition: all var(--transition);
}
.filter-btn:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}
.filter-btn--active {
  background: var(--c-accent);
  color: #1F2327;
  border-color: var(--c-accent);
}

.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
  transform: translateY(-6px);
}
.product-card__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--c-bg);
}
.product-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.product-card:hover .product-card__media img {
  transform: scale(1.08);
}
.product-card__tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: #1F2327;
  background: var(--c-accent);
  border-radius: 100px;
}
.product-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-card__title {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-title);
  margin-bottom: 8px;
  transition: color var(--transition);
}
.product-card:hover .product-card__title {
  color: var(--c-accent);
}
.product-card__desc {
  font-size: 14px;
  color: var(--c-body);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}
.product-card__specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
.product-card__spec {
  padding: 4px 10px;
  font-size: 12px;
  color: var(--c-muted);
  background: var(--c-bg);
  border-radius: var(--radius-sm);
}
.product-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
  transition: gap var(--transition);
}
.product-card__link:hover { gap: 10px; }

/* ==================== About ==================== */
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about__media {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.about__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.about__badge {
  position: absolute;
  bottom: 24px;
  right: 24px;
  background: var(--c-card);
  border-radius: var(--radius);
  padding: 20px 28px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.about__badge-num {
  display: block;
  font-size: 36px;
  font-weight: 800;
  color: var(--c-accent);
  line-height: 1;
}
.about__badge-text {
  display: block;
  font-size: 13px;
  color: var(--c-muted);
  margin-top: 4px;
}
.about__content .section__tag { margin-bottom: 12px; }
.about__content .section__title { text-align: left; margin-bottom: 20px; }
.about__text {
  font-size: 16px;
  color: var(--c-body);
  line-height: 1.8;
  margin-bottom: 24px;
}
.about__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 24px;
  margin-bottom: 32px;
}
.about__features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--c-title);
  font-weight: 500;
}

/* ==================== Operations ==================== */
.operations { background: var(--c-card); }
.operations__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ops-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 3 / 4;
  cursor: pointer;
}
.ops-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.ops-card:hover img { transform: scale(1.08); }
.ops-card__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 28px 24px;
  background: linear-gradient(to top, rgba(39,44,48,0.95), transparent);
}
.ops-card__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: #1F2327;
  background: var(--c-accent);
  border-radius: 100px;
  margin-bottom: 12px;
}
.ops-card__overlay h3 {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}
.ops-card__overlay p {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
}

/* ==================== News ==================== */
.news__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.news-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
  transform: translateY(-4px);
}
.news-card__media {
  overflow: hidden;
  aspect-ratio: 16 / 10;
}
.news-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.news-card:hover .news-card__media img { transform: scale(1.06); }
.news-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.news-card__date {
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 8px;
}
.news-card__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
  margin-bottom: 12px;
  transition: color var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card:hover .news-card__title { color: var(--c-accent); }
.news-card__meta {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.news-card__views {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-muted);
}
.news-card__views svg { color: var(--c-muted); }
.news-card__category {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-accent);
  padding: 3px 10px;
  background: rgba(169, 205, 11, 0.1);
  border-radius: 100px;
}

/* ==================== CTA Band ==================== */
.cta-band {
  background: var(--c-dark-bg);
  padding: 56px 0;
}
.cta-band__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.cta-band__text h2 {
  font-size: 28px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}
.cta-band__text p {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
}

/* ==================== Page Hero（子页面标题区） ==================== */
.page-hero {
  margin-top: 84px;
  background: var(--c-dark-bg);
  padding: 56px 0 48px;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute;
  right: -60px;
  bottom: -60px;
  width: 220px;
  height: 220px;
  border: 30px solid rgba(169, 205, 11, 0.12);
  border-radius: 50%;
  pointer-events: none;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  margin-bottom: 18px;
}
.breadcrumb a {
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span { color: rgba(255,255,255,0.35); }
.breadcrumb em {
  font-style: normal;
  color: var(--c-accent);
  font-weight: 500;
}
.page-hero__title {
  font-size: 40px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 12px;
}
.page-hero__desc {
  font-size: 16px;
  color: rgba(255,255,255,0.7);
}

/* ==================== 联系我们：公司信息卡 ==================== */
.contact-info { padding-bottom: 0; }
.contact-info__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 24px;
}
.info-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}
.info-card:hover {
  border-color: var(--c-accent);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
  transform: translateY(-6px);
}
.info-card__icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: rgba(169, 205, 11, 0.12);
  color: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.info-card:hover .info-card__icon {
  background: var(--c-accent);
  color: #1F2327;
}
.info-card__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-muted);
  margin-bottom: 8px;
}
.info-card__value {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
  word-break: break-all;
}
.info-card__value a { color: inherit; transition: color var(--transition); }
.info-card__value a:hover { color: var(--c-accent); }
.info-card__sub {
  font-size: 13px;
  color: var(--c-muted);
  margin-top: 8px;
}

/* ==================== 获取报价表单 ==================== */
.quote { padding-top: 64px; }
.quote__panel {
  max-width: 820px;
  margin: 0 auto;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 48px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.04);
}
.quote-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-field { margin-bottom: 20px; }
.form-field__label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 8px;
}
.form-field__label .required { color: var(--c-accent); }
.form-field__input {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: inherit;
  color: var(--c-title);
  background: var(--c-bg);
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition);
}
.form-field__input::placeholder { color: var(--c-muted); opacity: 0.8; }
.form-field__input:focus {
  border-color: var(--c-accent);
  background: var(--c-card);
  box-shadow: 0 0 0 3px rgba(169, 205, 11, 0.15);
}
.form-field__input--area {
  resize: vertical;
  min-height: 140px;
  line-height: 1.6;
}
.form-field__error {
  display: none;
  font-size: 13px;
  color: #D64545;
  margin-top: 6px;
}
.form-field--error .form-field__input {
  border-color: #D64545;
  background: #FDF6F6;
}
.form-field--error .form-field__error { display: block; }
.quote-form__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 8px;
}
.quote-form__tip {
  font-size: 13px;
  color: var(--c-muted);
}

/* 提交成功面板 */
.quote-success {
  text-align: center;
  padding: 24px 0;
}
.quote-success__icon { margin-bottom: 20px; }
.quote-success h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-title);
  margin-bottom: 12px;
}
.quote-success p {
  font-size: 15px;
  color: var(--c-body);
  line-height: 1.7;
  max-width: 460px;
  margin: 0 auto 28px;
}

/* ==================== Footer ==================== */
.footer {
  background: var(--c-footer);
  padding: 64px 0 0;
}
.footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer__col--brand { max-width: 360px; }
.logo--footer { margin-bottom: 20px; }
.logo__img--footer { width: 48px; height: 36px; }
.footer__desc {
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
.footer__social {
  display: flex;
  gap: 12px;
}
.footer__social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-muted);
  transition: all var(--transition);
}
.footer__social a:hover {
  background: var(--c-accent);
  color: #1F2327;
}
.footer__title {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
}
.footer__links li { margin-bottom: 12px; }
.footer__links a {
  font-size: 14px;
  color: var(--c-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--c-accent); }
.footer__contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--c-muted);
}
.footer__contact a { color: var(--c-muted); transition: color var(--transition); }
.footer__contact a:hover { color: var(--c-accent); }
.footer__contact svg { flex-shrink: 0; margin-top: 2px; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer__bottom p {
  font-size: 13px;
  color: var(--c-muted);
}
.footer__bottom a {
  color: var(--c-muted);
  transition: color var(--transition);
}
.footer__bottom a:hover { color: var(--c-accent); }

/* ==================== Back to Top ==================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-accent);
  color: #1F2327;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(169, 205, 11, 0.4);
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--c-accent-hover);
  transform: translateY(-4px);
}

/* ==================== Responsive: Tablet ==================== */
@media (max-width: 1024px) {
  .container { padding: 0 20px; }
  .banner__title { font-size: 42px; }
  .products__grid,
  .news__grid,
  .operations__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer__top {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
  .footer__col--brand { grid-column: 1 / -1; max-width: 100%; }
  .about__inner { gap: 40px; }
  .section__title { font-size: 28px; }
  .page-hero__title { font-size: 32px; }
  .quote__panel { padding: 32px; }
}

/* ==================== Responsive: Mobile ==================== */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .logo__img { width: 80px; height: 60px; }
  .logo__text { font-size: 18px; }
  .header__inner { height: 84px; }
  .banner { margin-top: 84px; }

  /* Nav → Hamburger */
  .header__cta { display: none; }
  .hamburger { display: flex; }
  .nav {
    position: fixed;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--c-dark-bg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    margin: 0;
  }
  .nav.open { max-height: 500px; }
  .nav__list {
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 0;
  }
  .nav__item { width: 100%; }
  .nav__link {
    padding: 14px 16px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    border-radius: 0;
  }
  .nav__link--active::after { display: none; }
  .nav__link--active { color: var(--c-accent); }
  .dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background: rgba(255,255,255,0.03);
    padding: 0 0 0 24px;
  }
  .nav__item--has-dropdown:hover .dropdown { display: block; }
  .dropdown li a { color: var(--c-nav-text); font-size: 15px; }

  /* Banner */
  .banner { height: 480px; }
  .banner__title { font-size: 30px; }
  .banner__desc { font-size: 15px; }
  .banner__actions { flex-direction: column; gap: 12px; }
  .banner__arrow { display: none; }

  /* Stats */
  .stats-bar__inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 0;
    padding: 32px 24px;
  }
  .stat-item:nth-child(2)::after { display: none; }
  .stat-item__num { font-size: 30px; }

  /* Section */
  .section { padding: 56px 0; }
  .section__title { font-size: 24px; }
  .section__head { margin-bottom: 32px; }
  .section__head--row { flex-direction: column; gap: 16px; align-items: flex-start; }

  /* Products */
  .products__grid,
  .news__grid,
  .operations__grid {
    grid-template-columns: 1fr;
  }
  .products__filter { gap: 8px; }
  .filter-btn { padding: 6px 16px; font-size: 13px; }

  /* About */
  .about__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .about__features { grid-template-columns: 1fr; }

  /* CTA */
  .cta-band__inner {
    flex-direction: column;
    text-align: center;
    gap: 24px;
  }
  .cta-band__text h2 { font-size: 22px; }

  /* Page Hero */
  .page-hero { padding: 40px 0 36px; }
  .page-hero__title { font-size: 28px; }

  /* 联系我们 */
  .contact-info__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .info-card { padding: 22px 16px; }
  .info-card__value { font-size: 14px; }

  /* 报价表单 */
  .quote__panel { padding: 24px 20px; }
  .quote-form__row { grid-template-columns: 1fr; gap: 0; }
  .quote-form__footer {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  /* Footer */
  .footer__top {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer__bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .back-to-top { bottom: 20px; right: 20px; }
}

/* ==================== Responsive: Small Mobile ==================== */
@media (max-width: 380px) {
  .banner__title { font-size: 26px; }
  .stats-bar__inner { grid-template-columns: 1fr; gap: 24px; }
  .stat-item::after { display: none !important; }
  .btn { padding: 10px 22px; font-size: 14px; }
}

/* ==================== 子页面：面包屑 & 页头 ==================== */
.page-hero {
  margin-top: 84px;
  background: var(--c-dark-bg);
  padding: 56px 0 48px;
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  margin-bottom: 20px;
}
.page-hero .breadcrumb { color: rgba(255,255,255,0.55); }
.breadcrumb a { color: rgba(255,255,255,0.75); transition: color var(--transition); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span { color: rgba(255,255,255,0.35); }
.breadcrumb em { font-style: normal; color: var(--c-accent); }
.page-hero__title {
  font-size: 40px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.5px;
}
.page-hero__desc {
  font-size: 16px;
  color: rgba(255,255,255,0.65);
  margin-top: 12px;
}

/* 非深色页头下的面包屑 */
.news-detail .breadcrumb {
  color: var(--c-muted);
  margin-bottom: 28px;
}
.news-detail .breadcrumb a { color: var(--c-body); }
.news-detail .breadcrumb a:hover { color: var(--c-accent); }
.news-detail .breadcrumb span { color: var(--c-border); }

/* ==================== 新闻栏目页 ==================== */
.news-page { padding-top: 56px; }
.news-page__layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
}

/* 左侧分类 */
.news-sidebar {
  position: sticky;
  top: 108px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.news-sidebar__card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
}
.news-sidebar__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-title);
  padding-bottom: 16px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.news-sidebar__title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 40px;
  height: 2px;
  background: var(--c-accent);
}
.news-sidebar__list li { margin: 2px 0; }
.news-sidebar__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-body);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.news-sidebar__link:hover {
  color: var(--c-accent);
  background: var(--c-bg);
}
.news-sidebar__link--active,
.news-sidebar__link--active:hover {
  color: #1F2327;
  background: var(--c-accent);
  font-weight: 600;
}
.news-sidebar__num {
  font-size: 12px;
  color: var(--c-muted);
  background: var(--c-bg);
  border-radius: 100px;
  padding: 2px 9px;
  transition: all var(--transition);
}
.news-sidebar__link--active .news-sidebar__num {
  color: #1F2327;
  background: rgba(255,255,255,0.35);
}
.news-sidebar__card--cta h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
  margin-bottom: 8px;
}
.news-sidebar__card--cta p {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.news-sidebar__card--cta .btn { width: 100%; }

/* 右侧新闻列表 */
.news-list__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.news-list__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-title);
}
.news-list__count {
  font-size: 13px;
  color: var(--c-muted);
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  padding: 4px 12px;
}
.news-list__items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.news-list__empty {
  padding: 64px 0;
  text-align: center;
  color: var(--c-muted);
  font-size: 15px;
}

/* 列表项：左图右文 */
.news-item {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.news-item:hover {
  border-color: var(--c-accent);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
  transform: translateY(-3px);
}
.news-item__media {
  overflow: hidden;
  aspect-ratio: 16 / 10;
  height: 100%;
  background: var(--c-bg);
}
.news-item__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.news-item:hover .news-item__media img { transform: scale(1.06); }
.news-item__body {
  padding: 24px 24px 20px 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.news-item__title {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
  margin: 10px 0 8px;
  transition: color var(--transition);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-item:hover .news-item__title { color: var(--c-accent); }
.news-item__summary {
  font-size: 14px;
  color: var(--c-body);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-item__meta {
  margin-top: auto;
  padding-top: 14px;
  display: flex;
  align-items: center;
  gap: 20px;
  width: 100%;
}
.news-item__date {
  font-size: 13px;
  color: var(--c-muted);
}
.news-item__more {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-accent);
  transition: gap var(--transition);
}
.news-item:hover .news-item__more { gap: 9px; }

/* ==================== 新闻详细页 ==================== */
.news-detail { padding-top: 40px; }
.detail-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.detail-card__head { padding: 40px 48px 28px; }
.detail-card__title {
  font-size: 30px;
  font-weight: 800;
  color: var(--c-title);
  line-height: 1.35;
  letter-spacing: -0.5px;
  margin: 14px 0 18px;
}
.detail-card__meta {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--c-border);
}
.detail-card__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  color: var(--c-muted);
}
.detail-card__meta-item svg { color: var(--c-muted); }
.detail-card__cover {
  aspect-ratio: 16 / 7;
  background: var(--c-bg);
}
.detail-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.detail-card__body {
  padding: 36px 48px 44px;
}
.detail-card__body p {
  font-size: 16px;
  color: var(--c-body);
  line-height: 1.9;
  text-align: justify;
  margin-bottom: 20px;
}
.detail-card__body p:last-child { margin-bottom: 0; }
.detail-card__body p:first-letter { margin-right: 0; }

/* 上一篇 / 下一篇 */
.detail-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}
.detail-nav__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: all var(--transition);
}
.detail-nav__item:hover {
  border-color: var(--c-accent);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.detail-nav__item--prev { align-items: flex-start; text-align: left; }
.detail-nav__item--next { align-items: flex-end; text-align: right; }
.detail-nav__label {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-muted);
  letter-spacing: 1px;
}
.detail-nav__text {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-title);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}
.detail-nav__item:hover .detail-nav__text { color: var(--c-accent); }
.detail-nav__item--disabled { opacity: 0.45; pointer-events: none; }

/* 底部操作 */
.detail-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

/* ==================== 关于我们子页面 ==================== */

/* 本页栏目导航 */
.subnav {
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 84px;
  z-index: 900;
}
.subnav__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.subnav__link {
  display: block;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-body);
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.subnav__link:hover {
  color: var(--c-accent-hover);
  border-bottom-color: var(--c-border);
}

/* 公司介绍：复用首页 .about 布局，仅微调段落间距 */
.about-page .about__text + .about__text { margin-top: 14px; }
.about-page .about__features { margin: 24px 0 28px; }

/* 创始人 */
.founder-section { padding-bottom: 0; }
.founder {
  display: grid;
  grid-template-columns: 340px 1fr;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.founder__media {
  background: linear-gradient(160deg, #272C30, #1F2327);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 48px 32px;
  text-align: center;
}
.founder__photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  border: 4px solid rgba(169, 205, 11, 0.25);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}
.founder__avatar {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  background: var(--c-accent);
  color: #1F2327;
  font-size: 48px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 4px solid rgba(169, 205, 11, 0.25);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}
.founder__name {
  font-size: 24px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: 2px;
}
.founder__role {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-accent);
}
.founder__body { padding: 44px 48px; }
.founder__quote {
  border-left: 3px solid var(--c-accent);
  padding: 4px 0 4px 20px;
  font-size: 18px;
  font-weight: 600;
  color: var(--c-title);
  line-height: 1.7;
}
.founder__bio {
  margin-top: 20px;
  font-size: 15px;
  color: var(--c-body);
  line-height: 1.8;
}
.founder__tags {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.founder__tag {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--c-body);
}

/* 团队 */
.team-section { padding-top: 0; }
.team__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.team-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  transition: all var(--transition);
}
.team-card:hover {
  transform: translateY(-6px);
  border-color: rgba(169, 205, 11, 0.5);
  box-shadow: 0 16px 32px rgba(31, 35, 39, 0.08);
}
.team-card__photo {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto 20px;
  border: 3px solid rgba(169, 205, 11, 0.35);
}
.team-card__avatar {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  margin: 0 auto 20px;
  background: linear-gradient(160deg, #272C30, #3A4045);
  color: var(--c-accent);
  font-size: 30px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.team-card__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
}
.team-card__role {
  margin-top: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-accent-hover);
}
.team-card__desc {
  margin-top: 12px;
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.7;
}

/* 企业文化 */
.culture-section { padding-top: 0; }
.culture__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.culture-card {
  position: relative;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  overflow: hidden;
  transition: all var(--transition);
}
.culture-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.culture-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(31, 35, 39, 0.08);
}
.culture-card:hover::before { transform: scaleX(1); }
.culture-card__num {
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  color: rgba(169, 205, 11, 0.28);
}
.culture-card__title {
  margin-top: 14px;
  font-size: 20px;
  font-weight: 700;
  color: var(--c-title);
}
.culture-card__text {
  margin-top: 12px;
  font-size: 14px;
  color: var(--c-body);
  line-height: 1.8;
}
.values {
  margin-top: 48px;
  background: var(--c-dark-bg);
  border-radius: var(--radius);
  padding: 48px;
}
.values__title {
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
}
.values__grid {
  margin-top: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.value-item {
  text-align: center;
  padding: 24px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.value-item:hover {
  border-color: var(--c-accent);
  background: rgba(169, 205, 11, 0.06);
}
.value-item__word {
  font-size: 20px;
  font-weight: 800;
  color: var(--c-accent);
  letter-spacing: 4px;
}
.value-item__desc {
  margin-top: 10px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.7;
}

/* ==================== 子页面响应式 ==================== */
@media (max-width: 1024px) {
  .news-page__layout {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }
  .news-item {
    grid-template-columns: 220px 1fr;
    gap: 20px;
  }
  .detail-card__head { padding: 32px 32px 24px; }
  .detail-card__body { padding: 28px 32px 36px; }
  .detail-card__title { font-size: 26px; }

  /* 关于我们页 */
  .team__grid { grid-template-columns: repeat(2, 1fr); }
  .values__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .page-hero { margin-top: 84px; padding: 40px 0 36px; }
  .page-hero__title { font-size: 28px; }
  .news-page { padding-top: 40px; }

  /* 布局：分类横向排列 */
  .news-page__layout { grid-template-columns: 1fr; }
  .news-sidebar {
    position: static;
    flex-direction: column;
  }
  .news-sidebar__list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .news-sidebar__list li { margin: 0; }
  .news-sidebar__link {
    padding: 8px 14px;
    border: 1px solid var(--c-border);
    border-radius: 100px;
    gap: 6px;
  }
  .news-sidebar__link--active,
  .news-sidebar__link--active:hover {
    border-color: var(--c-accent);
  }

  /* 列表项：上图下文 */
  .news-item {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .news-item__media { aspect-ratio: 16 / 9; }
  .news-item__body { padding: 20px; }
  .news-item__title { font-size: 17px; }

  /* 详情页 */
  .detail-card__head { padding: 24px 20px 20px; }
  .detail-card__title { font-size: 22px; }
  .detail-card__meta { flex-wrap: wrap; gap: 12px 20px; }
  .detail-card__cover { aspect-ratio: 16 / 10; }
  .detail-card__body { padding: 24px 20px 28px; }
  .detail-card__body p { font-size: 15px; }
  .detail-nav { grid-template-columns: 1fr; }
  .detail-nav__item--next { align-items: flex-start; text-align: left; }
  .detail-actions { flex-direction: column; align-items: stretch; }

  /* 关于我们页 */
  .subnav__inner { gap: 4px; overflow-x: auto; justify-content: flex-start; }
  .subnav__link { padding: 10px 14px; white-space: nowrap; }
  .founder { grid-template-columns: 1fr; }
  .founder__media { padding: 40px 24px; }
  .founder__body { padding: 28px 24px; }
  .team__grid { grid-template-columns: 1fr; }
  .culture__grid { grid-template-columns: 1fr; }
  .values { padding: 32px 20px; }
  .values__grid { grid-template-columns: 1fr; }
}

/* ==================== 产品中心（目录页） ==================== */
.pdt-page { padding-top: 56px; }
.pdt-page__layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
}

/* 左侧多级分类树 */
.pdt-sidebar {
  position: sticky;
  top: 108px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.pdt-sidebar__card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
}
.pdt-sidebar__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-title);
  padding-bottom: 16px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.pdt-sidebar__title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 40px;
  height: 2px;
  background: var(--c-accent);
}
.pdt-sidebar__card--cta h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
  margin-bottom: 8px;
}
.pdt-sidebar__card--cta p {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.pdt-sidebar__card--cta .btn { width: 100%; }

.cat-tree li { margin: 2px 0; }
.cat-tree__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-body);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.cat-tree__link:hover {
  color: var(--c-accent);
  background: var(--c-bg);
}
.cat-tree__link--active,
.cat-tree__link--active:hover {
  color: #1F2327;
  background: var(--c-accent);
  font-weight: 600;
}
.cat-tree__num {
  font-size: 12px;
  color: var(--c-muted);
  background: var(--c-bg);
  border-radius: 100px;
  padding: 2px 9px;
  transition: all var(--transition);
}
.cat-tree__link--active .cat-tree__num {
  color: #1F2327;
  background: rgba(255,255,255,0.35);
}

/* 一级行：标题 + 展开按钮 */
.cat-tree__row {
  display: flex;
  align-items: center;
  gap: 4px;
}
.cat-tree__row .cat-tree__link { flex: 1; }
.cat-tree__toggle {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.cat-tree__toggle:hover {
  color: var(--c-accent);
  background: var(--c-bg);
}
.cat-tree__toggle svg { transition: transform var(--transition); }
.cat-tree__group--open > .cat-tree__row .cat-tree__toggle svg {
  transform: rotate(180deg);
}

/* 二级子分类（默认收起，展开时显示） */
.cat-tree__sub {
  display: none;
  padding-left: 14px;
  border-left: 2px solid var(--c-border);
  margin: 2px 0 6px 18px;
}
.cat-tree__group--open > .cat-tree__sub { display: block; }
.cat-tree__link--sub {
  padding: 9px 12px;
  font-size: 13.5px;
  font-weight: 400;
}

/* 右侧产品列表 */
.pdt-list__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.pdt-list__title {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-title);
}
.pdt-list__count {
  font-size: 13px;
  color: var(--c-muted);
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: 100px;
  padding: 4px 12px;
}
.pdt-list__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.pdt-list__empty {
  padding: 64px 0;
  text-align: center;
  color: var(--c-muted);
  font-size: 15px;
}

/* ==================== 产品详情页 ==================== */
.pdt-detail-page { padding-top: 40px; }
.breadcrumb--light {
  color: var(--c-muted);
  margin-bottom: 28px;
}
.breadcrumb--light a { color: var(--c-body); }
.breadcrumb--light a:hover { color: var(--c-accent); }
.breadcrumb--light span { color: var(--c-border); }

/* 产品主信息区 */
.pdt-hero {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 40px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 32px;
}
.pdt-gallery__main {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--c-bg);
  margin-bottom: 14px;
}
.pdt-gallery__main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pdt-gallery__thumbs {
  display: flex;
  gap: 12px;
}
.pdt-gallery__thumb {
  width: 84px;
  height: 62px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--c-border);
  padding: 0;
  opacity: 0.65;
  transition: all var(--transition);
}
.pdt-gallery__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pdt-gallery__thumb:hover { opacity: 1; }
.pdt-gallery__thumb--active {
  border-color: var(--c-accent);
  opacity: 1;
}

.pdt-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.pdt-info__tag { position: static; margin-bottom: 14px; }
.pdt-info__title {
  font-size: 28px;
  font-weight: 800;
  color: var(--c-title);
  line-height: 1.35;
  letter-spacing: -0.3px;
}
.pdt-info__category {
  margin-top: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-accent-hover);
}
.pdt-info__desc {
  margin-top: 16px;
  font-size: 15px;
  color: var(--c-body);
  line-height: 1.8;
}
.pdt-info__specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.pdt-info__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}
.pdt-info__promise {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px dashed var(--c-border);
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pdt-info__promise li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--c-muted);
}
.pdt-info__promise li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-accent);
}

/* 信息区块 */
.pdt-block {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 36px 40px;
  margin-bottom: 24px;
}
.pdt-block__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-title);
  padding-bottom: 14px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.pdt-block__title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 48px;
  height: 2px;
  background: var(--c-accent);
}
.pdt-block__body p {
  font-size: 15px;
  color: var(--c-body);
  line-height: 1.9;
  text-align: justify;
  margin-bottom: 16px;
}
.pdt-block__body p:last-child { margin-bottom: 0; }

/* 技术参数表 */
.pdt-params__table {
  width: 100%;
  border-collapse: collapse;
}
.pdt-params__table tr {
  border-bottom: 1px solid var(--c-border);
}
.pdt-params__table tr:last-child { border-bottom: none; }
.pdt-params__table th {
  width: 40%;
  text-align: left;
  padding: 13px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-muted);
  background: var(--c-bg);
}
.pdt-params__table tr:nth-child(even) th { background: transparent; }
.pdt-params__table td {
  padding: 13px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-title);
}

/* 产品特点 */
.pdt-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 24px;
}
.pdt-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  color: var(--c-body);
  line-height: 1.7;
}
.pdt-features li svg { flex-shrink: 0; margin-top: 3px; }

/* 相关产品 */
.pdt-related {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* 未找到 */
.pdt-notfound {
  padding: 80px 0;
  text-align: center;
}
.pdt-notfound h2 {
  font-size: 24px;
  color: var(--c-title);
  margin-bottom: 12px;
}
.pdt-notfound a { color: var(--c-accent); font-weight: 600; }

/* ==================== 产品页响应式 ==================== */
@media (max-width: 1024px) {
  .pdt-page__layout {
    grid-template-columns: 220px 1fr;
    gap: 24px;
  }
  .pdt-list__grid { gap: 20px; }
  .pdt-hero {
    grid-template-columns: 1fr;
    padding: 24px;
  }
  .pdt-related { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .pdt-page { padding-top: 40px; }
  .pdt-page__layout { grid-template-columns: 1fr; }
  .pdt-sidebar { position: static; }
  .pdt-list__grid { grid-template-columns: 1fr; }
  .pdt-hero { padding: 20px; }
  .pdt-info__title { font-size: 23px; }
  .pdt-block { padding: 24px 20px; }
  .pdt-params__table th,
  .pdt-params__table td { padding: 10px 10px; }
  .pdt-params__table th { font-size: 13px; }
  .pdt-features { grid-template-columns: 1fr; }
  .pdt-related { grid-template-columns: 1fr; }
  .pdt-info__actions { width: 100%; }
  .pdt-info__actions .btn { flex: 1; }
}