/* ==================== CSS 变量 (统一主题) ==================== */
:root {
  --primary-color: #E60012;
  --primary-dark: #cc0010;
  --text-dark: #333;
  --text-light: #666;
  --border-light: #f0f0f0;
  --bg-light: #f8f9fa;
  --footer-bg: #F2F9FE;
  --header-height-pc: 80px;
  --header-height-mobile: 54px;
  --banner-min-height: 600px;
  --border-radius: 8px;
  --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

/* ==================== 基础重置 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.5;
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul,
ol {
  list-style: none;
}

.warp {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* ==================== 焦点可见性 ==================== */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}
:focus:not(:focus-visible) {
  outline: none;
}

/* ==================== 移动端优先样式 ==================== */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height-mobile);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: var(--box-shadow);
}

.mobile-header .header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  padding: 0 15px;
}

.mobile-logo img {
  height: 32px;
  width: auto;
}

.mobile-menu-btn {
  width: 24px;
  height: 24px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-dark);
  margin: 2px 0;
  transition: 0.3s;
  border-radius: 2px;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}
.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -4px);
}

.mobile-nav {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  background: white;
  z-index: 999;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.mobile-nav.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav ul {
  padding: 15px 0;
}
.mobile-nav li {
  border-bottom: 1px solid var(--border-light);
}
.mobile-nav a {
  display: block;
  padding: 15px 20px;
  font-size: 16px;
  color: var(--text-dark);
}
.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--primary-color);
  background: #fff5f5;
}

.mobile-tel {
  padding: 15px 20px;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 16px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  gap: 8px;
}
.mobile-tel::before {
  content: none;
}

/* ==================== PC端头部 ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height-pc);
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--box-shadow);
}
.header.scrolled .nav__link,
.header.scrolled .tel__link {
  color: var(--text-dark);
}
.header.scrolled .logo__img--white {
  display: none;
}
.header.scrolled .logo__img {
  display: block;
}

.header__box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header__hd {
  display: flex;
  align-items: center;
}

.logo {
  margin-right: 40px;
}
.logo img {
  height: 32px;
  width: auto;
}
.logo__img {
  display: none;
}

.nav__list {
  display: flex;
  gap: 30px;
}
.nav__link {
  color: white;
  font-size: 16px;
  padding: 5px 0;
  position: relative;
}
.nav__link:hover {
  color: var(--primary-color);
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
  transform: translateX(-50%);
}
.nav__link:hover::after {
  width: 100%;
}

.tel__link {
  color: white;
  font-size: 16px;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tel__link::before {
  content: none;
}

/* ==================== Banner轮播 ==================== */
.banner {
  position: relative;
  height: 100vh;
  min-height: var(--banner-min-height);
  margin-top: calc(-1 * var(--header-height-pc));
  overflow: hidden;
}
.banner__slider {
  position: relative;
  width: 100%;
  height: 100%;
}
.banner__slides {
  position: relative;
  width: 100%;
  height: 100%;
}
.banner__slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.8s ease;
}
.banner__slide.active {
  opacity: 1;
  z-index: 1;
}
.banner__video,
.banner__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.banner-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to right, rgba(0,0,0,0.6), rgba(0,0,0,0.3));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
  padding: 0 10%;
  z-index: 2;
  text-align: center;
}
.banner-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: bold;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
  transform: translateY(30px);
  opacity: 0;
  transition: all 0.8s ease 0.3s;
}
.banner__slide.active .banner-title {
  transform: translateY(0);
  opacity: 1;
}
.banner-subtitle {
  font-size: clamp(18px, 2.5vw, 24px);
  margin-bottom: 40px;
  max-width: 800px;
  opacity: 0.9;
  transform: translateY(30px);
  opacity: 0;
  transition: all 0.8s ease 0.5s;
  line-height: 1.6;
}
.banner__slide.active .banner-subtitle {
  transform: translateY(0);
  opacity: 1;
}
.banner-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  transform: translateY(30px);
  opacity: 0;
  transition: all 0.8s ease 0.7s;
  justify-content: center;
}
.banner__slide.active .banner-buttons {
  transform: translateY(0);
  opacity: 1;
}
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  min-width: 160px;
  text-align: center;
  gap: 8px;
}
.btn-primary {
  background: var(--primary-color);
  color: white;
  border: 2px solid var(--primary-color);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(230,0,18,0.3);
}
.btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid white;
}
.btn-secondary:hover {
  background: white;
  color: var(--primary-color);
  transform: translateY(-2px);
}
.banner-nav {
  position: absolute;
  bottom: 40px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  z-index: 3;
}
.banner-dots {
  display: flex;
  gap: 12px;
}
.banner-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  padding: 0;
}
.banner-dot.active {
  background: var(--primary-color);
  transform: scale(1.2);
}
.banner-dot:hover {
  background: rgba(255,255,255,0.8);
}
.banner-arrows {
  position: absolute;
  top: 50%;
  left: 20px;
  right: 20px;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  z-index: 3;
}
.banner-arrow {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.banner-arrow:hover {
  background: rgba(230,0,18,0.8);
  transform: scale(1.1);
}

/* ==================== 关于我们 ==================== */
.about {
  padding: 80px 0;
  position: relative;
  background: white;
}
.about__warp {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
}
@media (min-width: 992px) {
  .about__warp {
    grid-template-columns: 460px 1fr;
    gap: 10px;
  }
}
.about__title {
  font-size: 28px;
  color: var(--text-dark);
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.about__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--primary-color);
  margin-top: 8px;
}
.about__subtitle {
  font-size: 20px;
  color: var(--text-light);
  margin-bottom: 20px;
}
.about__desc {
  font-size: 16px;
  color: var(--text-light);
  line-height: 1.8;
  margin-bottom: 40px;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item {
  padding: 20px;
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  transition: var(--transition);
}
.stat-item:hover {
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(230,0,18,0.1);
  transform: translateY(-2px);
}
.stat-number {
  font-size: 36px;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  min-width: 100px;
}
.stat-number::after {
  content: '+';
  font-size: 24px;
  color: var(--primary-color);
}
.stat-label {
  font-size: 14px;
  color: var(--text-light);
}
.about__image {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: none;
}
.about__image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}
.about__image:hover img {
  transform: scale(1.05);
}

/* ==================== 解决方案 ==================== */
.solutions {
  padding: 80px 0;
  background: var(--bg-light);
}
.section-title {
  text-align: center;
  margin-bottom: 50px;
}
.section-title h2 {
  font-size: 28px;
  color: var(--text-dark);
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--primary-color);
}
.section-title p {
  color: var(--text-light);
  max-width: 600px;
  margin: 20px auto 0;
}

.solutions-container {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 20px;
}
.solution-content {
  flex: 1;
  min-width: 0;
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
}
.solution-categories {
  width: 180px;
  background: white;
  border-radius: var(--border-radius);
  padding: 20px 12px;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

/* ========= 解决方案条目显示控制 ========= */
.solution-item {
  display: none; /* 默认隐藏所有 */
}
.solution-item.active {
  display: block; /* 激活项显示 */
}
/* ===================================== */

.solution-video-container {
  padding: 20px 20px 0 20px;
  width: 100%;
}
.solution-video {
  position: relative;
  width: 100%;
  height: 560px;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: #1a1a1a;
  margin: 0 auto;
}
.solution-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  color: #999;
  font-size: 16px;
  gap: 15px;
  background: #f5f5f5;
}
.video-placeholder::before {
  content: '▶';
  font-size: 48px;
  color: var(--primary-color);
}

/* 自定义播放按钮 */
.solution-video .play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(230, 0, 18, 0.8);
  border: 2px solid rgba(255, 255, 255, 0.9);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  z-index: 10;
  padding: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.solution-video .play-btn:hover {
  background: var(--primary-color);
  transform: translate(-50%, -50%) scale(1.1);
  border-color: white;
}
.solution-video .play-btn svg {
  width: 30px;
  height: 30px;
  margin-left: 4px;
}
/* 播放状态：隐藏按钮 */
.solution-video.playing .play-btn {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s, visibility 0.25s;
}

.solution-header {
  padding: 18px 20px;
  border-top: none;
  background: #fff;
  text-align: left;
}
.solution-header h3 {
  font-size: 20px;
  color: var(--text-dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}
.solution-header p {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text-light);
  font-size: 15px;
  margin: 0;
  line-height: 1.7;
}

.solution-category {
  padding: 12px 10px;
  margin-bottom: 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 3px solid transparent;
  text-align: left;
}
.category-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  margin-right: 8px;
}
.category-icon img {
  width: 20px;
  height: 20px;
  object-fit: contain;
}
.active-icon {
  display: none;
}
.solution-category.active .default-icon {
  display: none;
}
.solution-category.active .active-icon {
  display: inline-block;
}
.solution-category .category-name {
  flex: 1;
}
.category-arrow {
  font-size: 16px;
  color: #999;
  transition: var(--transition);
  margin-left: 5px;
}
.solution-category:hover {
  background: #fff5f5;
  color: var(--primary-color);
  border-left-color: var(--primary-color);
  transform: translateX(3px);
}
.solution-category:hover .category-arrow {
  color: var(--primary-color);
  transform: translateX(3px);
}
.solution-category.active {
  background: var(--primary-color);
  color: white;
  border-left-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(230,0,18,0.2);
}
.solution-category.active .category-arrow {
  color: white;
  transform: translateX(5px);
}

/* ==================== 合作伙伴 ==================== */
.partners {
  padding: 80px 0;
  background-image: url('https://hongfengvision.com/public/img/footerbg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  width: 100%;
}
.partners .section-title {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 15px;
}
.partners-container {
  position: relative;
  height: 300px;
  overflow: hidden;
  margin-top: 40px;
  width: 100%;
}
.marquee-track {
  display: flex;
  position: absolute;
  white-space: nowrap;
  will-change: transform;
}
.track-1 {
  animation: marqueeRight 15s linear infinite;
  top: 0;
  left: 0;
}
.track-2 {
  animation: marqueeLeft 10s linear infinite;
  top: 100px;
  left: 0;
}
.track-3 {
  animation: marqueeRight 15s linear infinite;
  top: 200px;
  left: 0;
}
@keyframes marqueeLeft {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
@keyframes marqueeRight {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

.partner-item {
  flex: 0 0 auto;
  margin: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 160px;
  height: 80px;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 10px;
  transition: var(--transition);
  position: relative;
}
.partner-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  transition: var(--transition);
}
.partner-item:hover::after {
  border-color: var(--primary-color);
}
.partner-item img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.partners-container:hover .marquee-track {
  animation-play-state: paused;
}

/* ==================== 联系我们 ==================== */
.contact-section {
  padding: 20px 0;
  background-image: url('https://hongfengvision.com/public/img/contact_bg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: white;
  position: relative;
}
.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 1;
}
.contact-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.contact-title {
  font-size: 18px;
  font-weight: 600;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  color: white;
  margin: 0;
}
.contact-phone {
  font-size: 20px;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 8px;
  color: white;
}
.contact-phone::before {
  content: none;
}
.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-color);
  color: white;
  padding: 8px 30px;
  border-radius: 40px;
  font-size: 16px;
  font-weight: bold;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.contact-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}
.contact-btn::after {
  content: '→';
  transition: transform 0.3s ease;
}
.contact-btn:hover::after {
  transform: translateX(5px);
}

/* ==================== 页脚 ==================== */
.footer {
  background: var(--footer-bg);
  color: var(--text-dark);
  padding: 50px 0 20px;
}
.footer-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 30px;
}
@media (min-width: 992px) {
  .footer-content {
    grid-template-columns: 1.5fr 2fr 1.2fr;
    gap: 30px;
    align-items: start;
  }
}
.company-info {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.company-info img {
  width: min-content;
  height: 45px;
  margin-bottom: 5px;
  filter: none;
}
.company-contact {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.company-contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-light);
  font-size: 14px;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}
.footer-nav-group {
  min-width: 120px;
}
.footer-nav-group h3 {
  font-size: 16px;
  color: var(--text-dark);
  margin-bottom: 15px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary-color);
  display: inline-block;
}
.footer-nav-group ul li {
  margin-bottom: 10px;
}
.footer-nav-group a {
  color: var(--text-light);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-nav-group a:hover {
  color: var(--primary-color);
}
.qrcode-wrapper {
  display: flex;
  gap: 25px;
  justify-content: flex-start;
}
.qrcode-item {
  text-align: center;
}
.qrcode-item img {
  max-width: 120px;
  max-height: 120px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--border-radius);
  border: 1px solid #ddd;
  padding: 5px;
  background: white;
}
.qrcode-item span {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-light);
}
.friend-links {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
}
.friend-links h4 {
  font-size: 16px;
  color: var(--text-dark);
  margin-bottom: 15px;
  font-weight: 600;
}
.friend-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
.friend-links-list a {
  color: var(--text-light);
  font-size: 13px;
}
.friend-links-list a:hover {
  color: var(--primary-color);
}
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid #ccc;
  color: var(--text-light);
  font-size: 12px;
  margin-top: 20px;
}
.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-links a {
  color: var(--text-light);
  font-size: 12px;
}
.footer-links a:hover {
  color: var(--primary-color);
}
.copyright-info {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

/* ==================== 弹窗 ==================== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  justify-content: center;
  align-items: center;
  padding: 20px;
}
.modal-content {
  background: white;
  border-radius: var(--border-radius);
  padding: 40px;
  max-width: 500px;
  width: 100%;
  position: relative;
  animation: modalSlideIn 0.3s ease;
}
@keyframes modalSlideIn {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
.modal-close {
  position: absolute;
  width: 46px;
  height: 46px;
  top: 8px;
  right: 8px;
  font-size: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f0f0f0;
  border: 0 solid #f0f0f0;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
  -webkit-tap-highlight-color: transparent;
}
.modal-close:hover {
  background: rgba(230,0,18,0.1);
  color: var(--primary-color);
}
.modal-title {
  font-size: 24px;
  color: var(--text-dark);
  margin-bottom: 20px;
  text-align: center;
  position: relative;
  padding-bottom: 15px;
}
.modal-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 2px;
  background: var(--primary-color);
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-dark);
  font-weight: 500;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
  transition: var(--transition);
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(230,0,18,0.1);
}
.form-group textarea {
  height: 120px;
  resize: vertical;
}
.submit-btn {
  width: 100%;
  padding: 12px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.submit-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(230,0,18,0.3);
}

/* ==================== 响应式调整 ==================== */
@media (max-width: 991px) {
  .header { display: none; }
  .mobile-header { display: block; }
  .banner {
    height: 70vh;
    min-height: 500px;
    margin-top: calc(-1 * var(--header-height-mobile));
  }
  .banner-arrow { width: 40px; height: 40px; font-size: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-video { height: 400px; }
  .footer-content { grid-template-columns: 1fr; }
  .footer-nav { flex-direction: column; gap: 30px; }
  .qrcode-wrapper { justify-content: center; }
  .contact-content { flex-direction: column; gap: 10px; text-align: center; }
}

@media (max-width: 767px) {
  .warp { padding: 0 15px; }
  .banner {
    height: 60vh;
    min-height: 400px;
  }
  .banner-arrows { display: none; }
  .banner-nav { bottom: 20px; }
  .banner-overlay {
    justify-content: flex-end;
    padding-bottom: 30%;
  }
  .about, .solutions, .partners, .contact-section, .footer { padding: 40px 0; }
  .banner-title { font-size: 32px; }
  .banner-subtitle { font-size: 18px; }
  .banner-buttons { flex-direction: column; align-items: center; width: 100%; }
  .btn-primary, .btn-secondary { width: 100%; max-width: 300px; }
  .stats-grid { grid-template-columns: 1fr; }
  .solutions-container { flex-direction: column; }
  .solution-content { width: 100%; }
  .solution-categories {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    padding: 20px 15px;
  }
  .solution-category { margin-bottom: 0; padding: 12px 8px; font-size: 14px; }
  .solution-video { height: 250px; }
  .solution-header h3 { font-size: 18px; }
  .solution-video .play-btn {
    width: 48px;
    height: 48px;
  }
  .solution-video .play-btn svg {
    width: 24px;
    height: 24px;
  }
  .partners-container { height: 240px; }
  .track-2 { top: 80px; }
  .track-3 { top: 160px; }
  .partner-item { height: 60px; min-width: 120px; margin: 0 10px; }
  .footer-nav { flex-direction: row; flex-wrap: wrap; justify-content: space-between; gap: 20px; }
  .footer-nav-group { width: calc(30% - 10px); min-width: auto; }
  .qrcode-wrapper { flex-direction: row; justify-content: center; gap: 30px; }
  .company-info { align-items: center; text-align: left; }
  .company-info img { max-height: 45px; width: auto; margin-left: 0; margin-right: auto; }
  .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
  .copyright-info { justify-content: center; }
  .footer-links { justify-content: center; }
}

@media (max-width: 480px) {
  .banner-title { font-size: 28px; }
  .banner-subtitle { font-size: 16px; }
  .about__title { font-size: 24px; }
  .section-title h2 { font-size: 24px; }
  .stat-number { font-size: 28px; }
  .solution-header h3 { font-size: 18px; }
  .solution-video { height: 200px; }
  .modal-content { padding: 40px 20px; }
}