/**
 * 数云数据官方网站 - 全局补充样式
 * 优先使用 Tailwind CSS，此处仅保留必要自定义样式
 */

/* ========== CSS 变量 ========== */
:root {
  --color-primary: #165dff;
  --color-footer-bg: #0b1c3d;
  --color-banner-bg: #071433;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-border-light: #e5e7eb;
  --max-content-width: 1200px;
  --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --transition-base: 0.3s ease;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text-primary);
  background-color: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-width: 320px;
}

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

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

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

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

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ========== 通用工具类 ========== */
.content-container {
  width: 100%;
  max-width: var(--max-content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media (min-width: 640px) {
  .content-container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

/* ========== 导航栏 ========== */
#navbar,
.site-header {
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

@media (min-width: 768px) {
  .site-header__bar {
    height: 4.5rem;
  }
}

#navbar.nav-transparent,
.site-header.nav-transparent {
  background-color: transparent;
  box-shadow: none;
}

#navbar.nav-transparent .nav-link,
.site-header.nav-transparent .nav-link {
  color: #ffffff;
}

#navbar.nav-transparent .nav-toggle-bar,
.site-header.nav-transparent .nav-toggle-bar {
  background-color: #ffffff;
}

#navbar.nav-scrolled,
.site-header.nav-scrolled {
  background-color: #ffffff;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

#navbar.nav-scrolled .nav-link,
.site-header.nav-scrolled .nav-link {
  color: #374151;
}

#navbar.nav-scrolled .nav-toggle-bar,
.site-header.nav-scrolled .nav-toggle-bar {
  background-color: #374151;
}

.site-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-logo__inner {
  position: relative;
  display: inline-block;
  height: 32px;
  line-height: 0;
}

.site-logo__img {
  height: 32px;
  width: auto;
  display: block;
  transition: opacity var(--transition-base);
}

.site-logo__img--white {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 1;
}

.site-logo__img--dark {
  opacity: 0;
}

.site-logo.site-logo--dark .site-logo__img--white {
  opacity: 0;
}

.site-logo.site-logo--dark .site-logo__img--dark {
  opacity: 1;
}

@media (min-width: 768px) {
  .site-logo__inner {
    height: 36px;
  }

  .site-logo__img {
    height: 36px;
  }
}

.site-nav {
  display: flex;
  align-items: center;
}

@media (min-width: 768px) {
  .site-nav {
    gap: 2.5rem;
  }
}

.nav-link {
  position: relative;
  display: block;
  padding-bottom: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-base);
  white-space: nowrap;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base), left var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
  left: 0;
}

.nav-link.active {
  color: var(--color-primary) !important;
}

.nav-link.active::after {
  background-color: var(--color-primary);
}

#navbar.nav-transparent .nav-link.active,
.site-header.nav-transparent .nav-link.active {
  color: var(--color-primary) !important;
}

#navbar.nav-scrolled .nav-link:hover,
.site-header.nav-scrolled .nav-link:hover {
  color: var(--color-primary) !important;
}

#navbar.nav-transparent .nav-link:hover:not(.active),
.site-header.nav-transparent .nav-link:hover:not(.active) {
  color: rgba(255, 255, 255, 0.88) !important;
}

#navbar.nav-transparent .nav-link:hover:not(.active)::after,
.site-header.nav-transparent .nav-link:hover:not(.active)::after {
  width: 100%;
  left: 0;
  background-color: rgba(255, 255, 255, 0.6);
}

.btn-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #ffffff !important;
  padding: 0.5rem 1.25rem;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.25;
  transition:
    background-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
  white-space: nowrap;
}

.btn-login:hover {
  background-color: #0e42d2;
  color: #ffffff !important;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(22, 93, 255, 0.35);
}

.nav-toggle {
  position: relative;
  z-index: 60;
  padding: 0.5rem;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle-active .bar1 {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle-active .bar2 {
  opacity: 0;
}

.nav-toggle-active .bar3 {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-overlay {
  position: fixed;
  inset: 0;
  top: 4rem;
  z-index: 40;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

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

body.nav-open {
  overflow: hidden;
}

@media (max-width: 767px) {
  .site-nav {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 50;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 0;
    padding: 2rem 1.5rem 2.5rem;
    background-color: #ffffff;
    overflow-y: auto;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  }

  .site-nav.nav-menu-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-nav .nav-link {
    width: 100%;
    text-align: center;
    padding: 1rem 0;
    font-size: 1rem;
    color: #374151 !important;
  }

  .site-nav .nav-link.active {
    color: var(--color-primary) !important;
  }

  .site-nav .btn-login {
    margin-top: 1.5rem;
    width: 100%;
    max-width: 240px;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }
}

/* ========== 卡片 / 按钮交互（全站统一 0.3s） ========== */
.card-hover,
.interactive-card {
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base),
    border-color var(--transition-base);
}

.card-hover:hover,
.interactive-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(22, 93, 255, 0.14);
}

/* ========== 滚动渐入动画 ========== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

/* ========== 通用动画关键帧 ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.animate-fade-in-up {
  animation: fadeInUp 0.7s ease forwards;
}

.animate-slide-in-right {
  animation: slideInRight 0.7s ease forwards;
}

/* ========== 区块标题 ========== */
.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title__main {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0 0 0.5rem;
}

.section-title__sub {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
}

@media (min-width: 768px) {
  .section-title__main {
    font-size: 2rem;
  }
}

/* ========== 页脚（设计稿两栏布局） ========== */
.site-footer {
  background-color: var(--color-footer-bg);
  color: rgba(255, 255, 255, 0.75);
  padding: 3rem 0 0;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
  text-align: center;
}

.site-footer__col--brand {
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1fr auto;
    gap: 2.5rem;
    text-align: left;
    align-items: start;
  }

  .site-footer__col--brand {
    align-items: flex-start;
  }

  .site-footer__col:not(.site-footer__col--brand) {
    justify-self: end;
  }
}

.site-footer__logo {
  height: 32px;
  width: auto;
  margin-bottom: 1.5rem;
}

.site-footer__social {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

@media (min-width: 768px) {
  .site-footer__social {
    justify-content: flex-start;
  }
}

.site-footer__social-link {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.85);
  transition:
    border-color var(--transition-base),
    color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.site-footer__social-link:hover {
  border-color: #ffffff;
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.2);
}

.site-footer__heading {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  font-size: 0.875rem;
  line-height: 1.6;
}

.site-footer__copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.25rem 0 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.45);
  line-height: 1.8;
}

.site-footer__icp-link {
  color: rgba(255, 255, 255, 0.65);
  text-decoration: none;
  transition: color var(--transition-base);
}

.site-footer__icp-link:hover {
  color: #ffffff;
  text-decoration: underline;
}

/* ========== 功能卡片矩阵（设计稿高亮态） ========== */
.feature-card {
  text-align: center;
  padding: 2.25rem 1.5rem;
  border-radius: 0.5rem;
  background: #ffffff;
  border: 1px solid #eef0f4;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base);
}

.feature-card--active {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 12px 28px rgba(22, 93, 255, 0.28);
}

.feature-card--active .feature-card__subtitle {
  color: rgba(255, 255, 255, 0.85);
}

.feature-card__icon {
  width: 80px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-card__icon img,
.feature-card__icon svg {
  height: 56px;
  width: auto;
  max-width: 80px;
  display: block;
  object-fit: contain;
  transition: filter var(--transition-base);
}

.feature-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  line-height: 1.5;
}

.feature-card__subtitle {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
  transition: color var(--transition-base);
}

/* ========== 内页 Banner ========== */
.page-banner {
  position: relative;
  overflow: hidden;
}

/* ========== 首页全屏视频 Banner ========== */
.hero-banner {
  position: relative;
  overflow: hidden;
}

.hero-video-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  pointer-events: none;
}

/* ========== 首页模块 ========== */
.home-features {
  padding: 4.5rem 0 5rem;
  background: #ffffff;
}

.home-features__heading {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 3.5rem;
}

.home-features__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0 0 1rem;
  line-height: 1.45;
}

.home-features__subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

.home-features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .home-features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .home-features__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }
}

.home-features .feature-card:not(.feature-card--active) {
  border: none;
  box-shadow: none;
}

.home-features .feature-card:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(22, 93, 255, 0.28);
}

.home-features .feature-card:hover .feature-card__subtitle {
  color: rgba(255, 255, 255, 0.88);
}

.home-features .feature-card:hover .feature-card__icon img {
  filter: brightness(0) invert(1);
}

.home-features .feature-card:not(.feature-card--active):hover {
  box-shadow: 0 12px 28px rgba(22, 93, 255, 0.28);
}

.feature-card:not(.feature-card--active):hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(22, 93, 255, 0.14);
}

.feature-card--active:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(22, 93, 255, 0.32);
}

.feature-card--active .feature-card__subtitle {
  color: rgba(255, 255, 255, 0.88);
}

.feature-card--active .feature-card__icon svg {
  stroke: #ffffff;
}

.feature-card--active .feature-card__icon img {
  filter: brightness(0) invert(1);
}

.feature-card__icon svg {
  stroke: var(--color-primary);
}

/* 关于我们简介 */
.home-about__banner {
  position: relative;
  overflow: hidden;
  padding: 4rem 1rem;
  text-align: center;
  color: #ffffff;
  background-color: #0a2463;
  background-image: url("../images/about-section-bg.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.home-about__banner-inner {
  position: relative;
  z-index: 1;
}

.home-about__banner-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 0.35rem;
}

.home-about__banner-subtitle {
  font-size: 1rem;
  opacity: 0.9;
  margin: 0;
  letter-spacing: 0.04em;
}

.home-about__body {
  background: #ffffff;
  padding: 3.5rem 0 4rem;
}

.home-about__text {
  max-width: 920px;
  margin: 0 auto;
  text-align: center;
}

.home-about__text p {
  font-size: 0.9375rem;
  line-height: 2;
  color: var(--color-text-secondary);
  margin: 0 0 1.5rem;
}

.home-about__text p:last-of-type {
  margin-bottom: 2.5rem;
}

.btn-more {
  display: inline-block;
  min-width: 140px;
  padding: 0.625rem 2.5rem;
  border: 1px solid #d1d5db;
  background: #f5f5f5;
  color: #666666;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-align: center;
  border-radius: 0.25rem;
  transition:
    background-color var(--transition-base),
    border-color var(--transition-base),
    color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.btn-more:hover {
  background: #ebebeb;
  border-color: #c4c4c4;
  color: #333333;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.btn-more--wide {
  min-width: 200px;
  letter-spacing: 0.08em;
}

.home-products__more-bar .btn-more--wide {
  background: transparent;
  border: none;
  color: #666666;
  min-width: auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

.home-products__more-bar .btn-more--wide:hover {
  background: transparent;
  box-shadow: none;
  color: #333333;
  transform: none;
}

/* 产品特色预览 */
.home-products {
  padding: 4.5rem 0 0;
  background: #ffffff;
}

.home-products__header {
  margin-bottom: 3rem;
  text-align: center;
}

.home-products__title {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--color-text-primary);
  margin: 0 0 0.35rem;
}

.home-products__title-zh {
  font-weight: 700;
}

.home-products__title-en {
  font-weight: 400;
  color: var(--color-text-secondary);
}

.home-products__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  font-weight: 300;
}

.home-products__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .home-products__layout {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.home-products__illustration {
  display: flex;
  justify-content: center;
}

.home-products__illustration img {
  width: 100%;
  max-width: 2126.25px;
}

.home-product-item {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem 0;
  border-bottom: 1px solid #eef0f4;
  border-radius: 0.375rem;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.home-product-item:hover {
  transform: translateY(-2px);
}

.home-product-item:last-child {
  border-bottom: none;
}

.home-product-item__icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border: 1.5px solid #d1d5db;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.home-product-item__icon img,
.home-product-item__icon svg {
  width: 24px;
  height: 24px;
  display: block;
  object-fit: contain;
}

.home-product-item__icon svg {
  stroke: currentColor;
}

.home-product-item__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0 0 0.5rem;
}

.home-product-item__desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin: 0;
}

.home-products__more-bar {
  margin-top: 3rem;
  padding: 2rem 1rem;
  background: #f5f7fa;
  text-align: center;
}

/* ========== 产品特色页 ========== */
.product-banner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 40vh;
  min-height: 280px;
  padding: 4.5rem 1rem 2rem;
  overflow: hidden;
  background-color: #05112b;
  background-image: url("../images/banner-product.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  color: #ffffff;
  text-align: center;
}

.product-banner__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(5, 17, 43, 0.32);
  pointer-events: none;
}

.product-banner__content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.product-banner__title {
  font-size: 36pt;
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  color: #ffffff;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.product-banner__subtitle {
  font-size: 18pt;
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: 0.08em;
}

.product-overview {
  padding: 4.5rem 0 5rem;
  background: #ffffff;
}

.product-overview__header {
  text-align: center;
  margin-bottom: 3rem;
}

.product-overview__title {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--color-text-primary);
  margin: 0 0 0.35rem;
}

.product-overview__title-zh {
  font-weight: 700;
}

.product-overview__title-en {
  font-weight: 400;
  color: var(--color-text-secondary);
}

.product-overview__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  font-weight: 300;
}

.product-overview__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .product-overview__layout {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

.product-overview__illustration {
  display: flex;
  justify-content: center;
}

.product-overview__illustration img {
  width: 100%;
  max-width: 6720px;
}

.product-overview__intro {
  font-size: 0.9375rem;
  line-height: 2;
  color: var(--color-text-secondary);
  margin: 0 0 1.75rem;
}

.product-advantages {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem 2rem;
}

@media (min-width: 768px) {
  .product-advantages {
    grid-template-columns: repeat(2, 1fr);
  }
}

.product-advantages__item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-primary);
}

.product-advantages__bullet {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  margin-top: 0.45rem;
  background: var(--color-primary);
  border-radius: 1px;
}

.product-modules {
  padding: 4.5rem 0 5.5rem;
  background: #ffffff;
}

.product-modules__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem 3rem;
}

@media (min-width: 768px) {
  .product-modules__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem 4rem;
  }
}

.product-module-card {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.product-module-card:hover {
  transform: translateY(-2px);
  box-shadow: none;
}

.product-module-card__icon {
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  border: 1.5px solid #d1d5db;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
}

.product-module-card__icon img,
.product-module-card__icon svg {
  width: 28px;
  height: 28px;
  display: block;
  object-fit: contain;
}

.product-module-card__icon svg {
  stroke: currentColor;
}

.product-module-card__title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0 0 0.75rem;
}

.product-module-card__desc {
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ========== 关于我们页 ========== */
.about-banner {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  height: 40vh;
  min-height: 280px;
  padding: 4.5rem 0 2rem;
  overflow: hidden;
  background-color: #0a0a1a;
  background-image: url("../images/banner-about.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  color: #ffffff;
}

.about-banner__content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--max-content-width);
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}

.about-banner__content > * {
  max-width: 480px;
}

.about-banner__label {
  font-size: calc(0.875rem + 2pt);
  color: rgba(255, 255, 255, 0.88);
  margin: 0 0 0.75rem;
  letter-spacing: 0.04em;
}

.about-banner__title {
  font-size: 31pt;
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: 0.03em;
  line-height: 1.2;
  color: #ffffff;
}

.about-banner__line {
  width: 48px;
  height: 2px;
  background: rgba(255, 255, 255, 0.85);
  margin: 0 0 1rem;
}

.about-banner__brand {
  font-size: calc(0.9375rem + 2pt);
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
  letter-spacing: 0.06em;
}

.about-intro {
  padding: 4.5rem 0 5rem;
  background: #ffffff;
}

.about-intro__header {
  text-align: center;
  margin-bottom: 3rem;
}

.about-intro__title {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--color-text-primary);
  margin: 0 0 0.35rem;
}

.about-intro__title-zh {
  font-weight: 700;
}

.about-intro__title-en {
  font-weight: 400;
  color: var(--color-text-secondary);
}

.about-intro__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  font-weight: 300;
}

.about-intro__blocks {
  width: 100%;
  margin: 0;
}

.about-block {
  margin-bottom: 2.5rem;
}

.about-block:last-child {
  margin-bottom: 0;
}

.about-block__heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0 0 1rem;
  line-height: 1.5;
}

.about-block__heading-en {
  font-weight: 600;
  color: #444444;
}

.about-block__text {
  font-size: 0.9375rem;
  line-height: 2;
  color: var(--color-text-secondary);
  margin: 0;
  text-align: justify;
}

.about-features {
  padding-top: 4.5rem;
  padding-bottom: 5rem;
  background: #ffffff;
}

.about-features .home-features__grid {
  margin-top: 0;
}

/* ========== 联系我们页 ========== */
.contact-banner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 40vh;
  min-height: 280px;
  padding: 4.5rem 1rem 2rem;
  overflow: hidden;
  background-color: #051a45;
  background-image: url("../images/banner-contact.jpg");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  color: #ffffff;
  text-align: center;
}

.contact-banner__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.contact-banner__title {
  font-size: 36pt;
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  color: #ffffff;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45), 0 1px 4px rgba(0, 0, 0, 0.35);
}

.contact-banner__subtitle {
  font-size: 18pt;
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: 0.08em;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.4);
}

.contact-section {
  padding: 4.5rem 0 6rem;
  background: #ffffff;
}

.contact-section__header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.contact-section__title {
  font-size: clamp(1.375rem, 2.5vw, 1.75rem);
  font-weight: 400;
  color: var(--color-text-primary);
  margin: 0 0 0.35rem;
}

.contact-section__title-zh {
  font-weight: 700;
}

.contact-section__title-en {
  font-weight: 400;
  color: var(--color-text-secondary);
}

.contact-section__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
  font-weight: 300;
}

.contact-section__body {
  display: flex;
  justify-content: center;
}

.contact-list {
  border-left: 3px solid var(--color-primary);
  padding-left: 1.75rem;
  max-width: 520px;
  width: fit-content;
  margin: 0 auto;
}

.contact-list__item {
  margin: 0 0 1.5rem;
}

.contact-list__item:last-child {
  margin-bottom: 0;
}

.contact-list__line {
  display: block;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.contact-list__item--primary .contact-list__line {
  color: var(--color-text-primary);
  font-weight: 500;
}

.contact-list__line:hover {
  color: var(--color-primary);
}

/* ========== 阶段7：全站响应式与交互增强 ========== */

/* 移动端 Banner / 区块间距压缩 */
@media (max-width: 767px) {
  .hero-banner {
    min-height: 480px;
    height: 100svh;
  }

  .home-features,
  .home-products,
  .product-overview,
  .product-modules,
  .about-intro,
  .about-features,
  .contact-section {
    padding-top: 3rem;
    padding-bottom: 3.5rem;
  }

  .about-banner {
    height: 40vh;
    min-height: 240px;
    padding-top: 5rem;
    padding-bottom: 1.5rem;
  }

  .about-banner__content > * {
    max-width: 100%;
  }

  .contact-banner,
  .product-banner {
    height: 40vh;
    min-height: 240px;
    padding-top: 5rem;
    padding-bottom: 1.5rem;
  }

  .home-features__title,
  .section-title__main {
    font-size: 1.375rem;
  }

  .feature-card {
    padding: 1.75rem 1.25rem;
  }

  .product-module-card {
    padding: 0;
    flex-direction: row;
    align-items: flex-start;
    text-align: left;
  }

  .contact-list {
    padding-left: 1.25rem;
    max-width: 100%;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
  }

  .contact-list__line {
    word-break: break-all;
  }

  .content-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* 平板端（768px ~ 1023px）间距与字号微调 */
@media (min-width: 768px) and (max-width: 1023px) {
  .home-features__grid,
  .product-modules__grid {
    gap: 1.5rem;
  }

  .home-products__layout,
  .product-overview__layout {
    gap: 2.5rem;
  }
}

/* 菜单展开时导航栏强制白底，避免透明态可读性问题 */
body.nav-open #navbar,
body.nav-open .site-header {
  background-color: #ffffff;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

body.nav-open #navbar .nav-toggle-bar,
body.nav-open .site-header .nav-toggle-bar {
  background-color: #374151;
}

/* 社交图标 hover 微动效 — 样式见 .site-footer__social-link */

/* 减少动画偏好：无障碍降级 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}