/* ========================================
   51视频 - 全局样式表
   ======================================== */
:root {
  --primary: #ff3d5a;
  --primary-dark: #e0284a;
  --primary-light: #ff6b82;
  --accent: #ffb020;
  --dark: #0d0e15;
  --dark-2: #14161f;
  --dark-3: #1c1f2b;
  --card: #1a1d29;
  --line: rgba(255, 255, 255, 0.08);
  --text: #eef0f6;
  --text-2: #a8adbd;
  --text-3: #6d7385;
  --gradient: linear-gradient(135deg, #ff3d5a 0%, #ff7a45 100%);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --radius-sm: 8px;
  --container: 1200px;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font);
  background: var(--dark);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease;
}

ul,
ol {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 通用动画 ---------- */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(36px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.06);
  }
}

@keyframes floatY {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-14px);
  }
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ---------- 头部导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(13, 14, 21, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
  background: rgba(13, 14, 21, 0.96);
  border-bottom-color: var(--line);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 61, 90, 0.4);
}

.brand span {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-menu a {
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  color: var(--text-2);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: #fff;
  background: rgba(255, 61, 90, 0.14);
}

.nav-cta {
  background: var(--gradient);
  color: #fff !important;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(255, 61, 90, 0.35);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(255, 61, 90, 0.45);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: 0.3s;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: 130px 0 80px;
  overflow: hidden;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(255, 61, 90, 0.22), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(255, 122, 69, 0.16), transparent 60%), var(--dark);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(255, 61, 90, 0.12);
  border: 1px solid rgba(255, 61, 90, 0.35);
  color: var(--primary-light);
  font-size: 13px;
  margin-bottom: 22px;
  animation: fadeUp 0.8s ease both;
}

.hero-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 1.8s infinite;
}

.hero h1 {
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.22;
  font-weight: 800;
  margin-bottom: 20px;
  animation: fadeUp 0.8s 0.1s ease both;
}

.hero h1 .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  color: var(--text-2);
  font-size: 17px;
  max-width: 560px;
  margin-bottom: 34px;
  animation: fadeUp 0.8s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  animation: fadeUp 0.8s 0.3s ease both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 10px 26px rgba(255, 61, 90, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(255, 61, 90, 0.5);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--text);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-3px);
}

.hero-stats {
  display: flex;
  gap: 44px;
  margin-top: 52px;
  animation: fadeUp 0.8s 0.45s ease both;
}

.hero-stats .num {
  font-size: 30px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-stats .label {
  font-size: 13px;
  color: var(--text-3);
}

.hero-media {
  position: relative;
  animation: fadeIn 1s 0.3s ease both;
}

.hero-media img {
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.hero-media .float-card {
  position: absolute;
  background: rgba(26, 29, 41, 0.92);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 18px;
  box-shadow: var(--shadow);
  animation: floatY 5s ease-in-out infinite;
}

.float-card.fc1 {
  top: 8%;
  left: -30px;
}

.float-card.fc2 {
  bottom: 10%;
  right: -24px;
  animation-delay: 1.4s;
}

.float-card .t {
  font-size: 13px;
  color: var(--text-3);
}

.float-card .v {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.play-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 78px;
  height: 78px;
  border-radius: 50%;
  background: rgba(255, 61, 90, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 14px rgba(255, 61, 90, 0.22);
  animation: pulse 2.2s infinite;
  cursor: pointer;
}

.play-badge::after {
  content: "";
  border-left: 22px solid #fff;
  border-top: 13px solid transparent;
  border-bottom: 13px solid transparent;
  margin-left: 5px;
}

/* ---------- 通用 Section ---------- */
.section {
  padding: 96px 0;
}

.section-dark {
  background: var(--dark-2);
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  background: rgba(255, 61, 90, 0.12);
  color: var(--primary-light);
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 800;
  margin-bottom: 14px;
}

.section-head p {
  color: var(--text-2);
  font-size: 16px;
}

/* ---------- 特性卡片 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 30px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 61, 90, 0.4);
  box-shadow: var(--shadow);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 58px;
  height: 58px;
  border-radius: 15px;
  background: rgba(255, 61, 90, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-2);
  font-size: 15px;
}

/* ---------- 服务 ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.service-item {
  display: flex;
  gap: 22px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.service-item:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 176, 32, 0.4);
}

.service-num {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 19px;
}

.service-item h3 {
  font-size: 19px;
  margin-bottom: 8px;
}

.service-item p {
  color: var(--text-2);
  font-size: 14px;
}

/* ---------- 视频卡片 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.video-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.video-thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
  transform: scale(1.08);
}

.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.72);
  padding: 2px 8px;
  border-radius: 5px;
  font-size: 12px;
}

.video-cat {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.video-info {
  padding: 16px 18px;
}

.video-info h3 {
  font-size: 16px;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  justify-content: space-between;
  color: var(--text-3);
  font-size: 13px;
}

/* ---------- 步骤/数据 ---------- */
.stats-band {
  background: var(--gradient);
  border-radius: 20px;
  padding: 52px 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
  box-shadow: 0 18px 50px rgba(255, 61, 90, 0.32);
}

.stats-band .num {
  font-size: 38px;
  font-weight: 800;
}

.stats-band .label {
  font-size: 14px;
  opacity: 0.9;
}

/* ---------- 步骤流程 ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: step;
}

.step-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  position: relative;
  transition: transform 0.3s ease;
}

.step-card:hover {
  transform: translateY(-6px);
}

.step-card::after {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 34px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.06);
}

.step-icon {
  font-size: 34px;
  margin-bottom: 14px;
}

.step-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-card p {
  color: var(--text-2);
  font-size: 14px;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 26px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  font-family: var(--font);
}

.faq-q .arrow {
  transition: transform 0.3s ease;
  color: var(--primary);
  font-size: 20px;
}

.faq-item.open .faq-q .arrow {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-a p {
  padding: 0 26px 22px;
  color: var(--text-2);
  font-size: 15px;
}

/* ---------- 新闻 ---------- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.news-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.news-card img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
  width: 100%;
}

.news-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.news-date {
  color: var(--primary-light);
  font-size: 13px;
  margin-bottom: 8px;
}

.news-body h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.news-body p {
  color: var(--text-2);
  font-size: 14px;
  flex: 1;
  margin-bottom: 16px;
}

.news-link {
  color: var(--primary-light);
  font-size: 14px;
  font-weight: 600;
}

.news-link:hover {
  color: var(--primary);
}

/* ---------- CTA ---------- */
.cta-section {
  padding: 100px 0;
  background: radial-gradient(800px 400px at 50% 0%, rgba(255, 61, 90, 0.2), transparent 70%), var(--dark-2);
  text-align: center;
}

.cta-box h2 {
  font-size: clamp(26px, 3.4vw, 42px);
  margin-bottom: 18px;
}

.cta-box p {
  color: var(--text-2);
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 16px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--dark);
  border-top: 1px solid var(--line);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-col h4 {
  font-size: 16px;
  margin-bottom: 18px;
  color: #fff;
}

.footer-col p,
.footer-col li {
  color: var(--text-3);
  font-size: 14px;
  margin-bottom: 10px;
}

.footer-col a:hover {
  color: var(--primary-light);
}

.footer-desc {
  max-width: 320px;
}

.footer-bottom {
  border-top: 1px solid var(--line);
  padding: 22px 0;
  text-align: center;
  color: var(--text-3);
  font-size: 13px;
}

/* ---------- 子页面 Banner ---------- */
.page-banner {
  padding: 170px 0 90px;
  background: radial-gradient(900px 400px at 50% -20%, rgba(255, 61, 90, 0.22), transparent 65%), var(--dark-2);
  text-align: center;
}

.page-banner h1 {
  font-size: clamp(30px, 4vw, 46px);
  margin-bottom: 16px;
}

.page-banner p {
  color: var(--text-2);
  max-width: 680px;
  margin: 0 auto;
  font-size: 16px;
}

.breadcrumb {
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-3);
}

.breadcrumb a {
  color: var(--primary-light);
}

/* ---------- 关于我们 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about-grid img {
  border-radius: 20px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.about-text h2 {
  font-size: clamp(24px, 2.8vw, 34px);
  margin-bottom: 18px;
}

.about-text p {
  color: var(--text-2);
  margin-bottom: 16px;
  font-size: 15px;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
  transition: transform 0.3s ease;
}

.team-card:hover {
  transform: translateY(-6px);
}

.team-card img {
  aspect-ratio: 1;
  object-fit: cover;
  width: 100%;
}

.team-card .info {
  padding: 18px;
}

.team-card h3 {
  font-size: 17px;
}

.team-card .role {
  color: var(--primary-light);
  font-size: 13px;
  margin-top: 4px;
}

/* ---------- 联系 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 44px;
}

.contact-info-item {
  display: flex;
  gap: 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 18px;
  transition: transform 0.3s ease;
}

.contact-info-item:hover {
  transform: translateX(6px);
}

.contact-info-item .ico {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 13px;
  background: rgba(255, 61, 90, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.contact-info-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-info-item p {
  color: var(--text-2);
  font-size: 14px;
}

.contact-form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 38px;
}

.contact-form h2 {
  font-size: 24px;
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text-2);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  background: var(--dark-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 15px;
  font-family: var(--font);
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.form-tip {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-3);
}

/* ---------- 产品 ---------- */
.product-hero-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.product-card img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  width: 100%;
}

.product-body {
  padding: 26px;
}

.product-body h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.product-body p {
  color: var(--text-2);
  font-size: 14px;
  margin-bottom: 18px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-list span {
  background: rgba(255, 61, 90, 0.12);
  color: var(--primary-light);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
}

/* 价格表 */
.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.price-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 38px 32px;
  text-align: center;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
}

.price-card:hover {
  transform: translateY(-8px);
}

.price-card.hot {
  border-color: var(--primary);
  box-shadow: 0 16px 46px rgba(255, 61, 90, 0.22);
}

.price-card .hot-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  padding: 4px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.price-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.price-num {
  font-size: 40px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 4px;
}

.price-per {
  color: var(--text-3);
  font-size: 13px;
  margin-bottom: 24px;
}

.price-card ul {
  text-align: left;
  flex: 1;
  margin-bottom: 26px;
}

.price-card li {
  padding: 9px 0;
  color: var(--text-2);
  font-size: 14px;
  border-bottom: 1px dashed var(--line);
}

.price-card li::before {
  content: "✓";
  color: var(--primary);
  font-weight: 700;
  margin-right: 8px;
}

/* ---------- 新闻详情 ---------- */
.article-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.article-meta {
  display: flex;
  gap: 22px;
  color: var(--text-3);
  font-size: 14px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.article-cover {
  border-radius: 18px;
  border: 1px solid var(--line);
  margin-bottom: 36px;
  box-shadow: var(--shadow);
}

.article-content h2 {
  font-size: 26px;
  margin: 36px 0 16px;
}

.article-content h3 {
  font-size: 20px;
  margin: 28px 0 12px;
}

.article-content p {
  color: var(--text-2);
  margin-bottom: 16px;
  font-size: 15.5px;
}

.article-content ul {
  margin: 0 0 20px 22px;
  color: var(--text-2);
}

.article-content ul li {
  list-style: disc;
  margin-bottom: 8px;
  font-size: 15px;
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--card);
  padding: 18px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-2);
  margin: 24px 0;
  font-size: 15px;
}

.article-tags {
  display: flex;
  gap: 10px;
  margin: 36px 0;
  flex-wrap: wrap;
}

.article-tags span {
  background: rgba(255, 61, 90, 0.12);
  color: var(--primary-light);
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 13px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient);
  color: #fff;
  border: none;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 900;
  box-shadow: 0 8px 24px rgba(255, 61, 90, 0.4);
}

.back-top.show {
  opacity: 1;
  pointer-events: auto;
}

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

/* ---------- 横幅跑马灯 ---------- */
.marquee-band {
  background: var(--dark-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  padding: 18px 0;
}

.marquee-track {
  display: flex;
  gap: 56px;
  white-space: nowrap;
  animation: marquee 28s linear infinite;
  width: max-content;
}

.marquee-track span {
  color: var(--text-3);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.marquee-track span::before {
  content: "▶";
  color: var(--primary);
  font-size: 11px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .features-grid,
  .news-grid,
  .product-hero-grid,
  .price-grid,
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .video-grid,
  .steps-grid,
  .stats-band,
  .value-grid,
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero-media {
    max-width: 640px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(13, 14, 21, 0.98);
    flex-direction: column;
    align-items: stretch;
    padding: 18px 24px 28px;
    gap: 4px;
    border-bottom: 1px solid var(--line);
    transform: translateY(-130%);
    transition: transform 0.35s ease;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .nav-menu a {
    padding: 13px 16px;
    border-radius: 10px;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: 118px;
  }

  .hero-stats {
    gap: 26px;
    flex-wrap: wrap;
  }

  .features-grid,
  .services-grid,
  .news-grid,
  .video-grid,
  .steps-grid,
  .stats-band,
  .about-grid,
  .contact-grid,
  .value-grid,
  .team-grid,
  .product-hero-grid,
  .price-grid,
  .related-grid,
  .form-row {
    grid-template-columns: 1fr;
  }

  .stats-band {
    padding: 38px 24px;
    gap: 22px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .float-card.fc1 {
    left: 6px;
  }

  .float-card.fc2 {
    right: 6px;
  }

  .contact-form {
    padding: 26px;
  }
}