/* ===== 基础样式 ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a56db;
  --primary-dark: #1240a8;
  --primary-light: #e8effc;
  --accent: #0891b2;
  --text: #1e293b;
  --text-light: #64748b;
  --bg: #ffffff;
  --bg-gray: #f8fafc;
  --border: #e2e8f0;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --header-h: 72px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* ===== 导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: box-shadow 0.3s, border-color 0.3s;
}

.header.scrolled {
  box-shadow: var(--shadow);
  border-bottom-color: var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
}

.logo-img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}

.nav {
  display: flex;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text-light);
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
}

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

.menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

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

.menu-btn.open span:nth-child(2) {
  opacity: 0;
}

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

/* ===== 首页横幅 ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1a56db 100%);
  z-index: 0;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(8, 145, 178, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(26, 86, 219, 0.4) 0%, transparent 40%);
}

.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  padding: 80px 24px;
}

.hero-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 12px;
  margin-bottom: 28px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  font-size: 0.875rem;
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin-bottom: 36px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn-outline {
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 4px;
}

/* ===== 通用区块 ===== */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text);
}

/* ===== 公司介绍 ===== */
.about {
  background: var(--bg-gray);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--text-light);
  font-size: 1.05rem;
}

.about-text strong {
  color: var(--text);
}

.about-highlight {
  font-size: 1.15rem !important;
  font-weight: 500;
  color: var(--primary) !important;
  border-left: 4px solid var(--primary);
  padding-left: 16px;
  margin-top: 24px !important;
}

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-card {
  background: #fff;
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

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

.about-card-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.about-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.about-card p {
  font-size: 0.925rem;
  color: var(--text-light);
}

/* ===== 软件著作权 ===== */
.copyrights {
  background: var(--bg);
}

.section-desc {
  max-width: 680px;
  margin: 16px auto 0;
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.8;
}

.section-desc strong {
  color: var(--primary);
}

.copyrights-summary {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.copyrights-stat {
  text-align: center;
}

.copyrights-stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.copyrights-stat-label {
  font-size: 0.875rem;
  color: var(--text-light);
}

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

.copyrights-item {
  background: var(--bg-gray);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: box-shadow 0.3s, transform 0.3s;
}

.copyrights-item:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.copyrights-item a {
  display: block;
  overflow: hidden;
}

.copyrights-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  object-position: top center;
  transition: transform 0.3s;
}

.copyrights-item:hover img {
  transform: scale(1.03);
}

.copyrights-item figcaption {
  padding: 14px 16px;
  font-size: 0.825rem;
  line-height: 1.5;
}

.copyrights-item figcaption strong {
  display: block;
  color: var(--text);
  font-weight: 500;
  margin-bottom: 4px;
}

.copyrights-item figcaption span {
  color: var(--text-light);
  font-size: 0.75rem;
}

/* ===== 产品介绍 ===== */
.products {
  background: var(--bg-gray);
}

.section-desc {
  margin-top: 16px;
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.product-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.product-pillar {
  display: block;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  cursor: pointer;
}

.product-pillar:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.product-pillar-books:hover { border-color: var(--primary); }
.product-pillar-edu:hover { border-color: var(--accent); }
.product-pillar-ai:hover { border-color: #7c3aed; }

.product-pillar-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 16px;
}

.product-pillar h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text);
}

.product-pillar p {
  font-size: 0.925rem;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.product-pillar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.product-pillar-tags span {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 50px;
  background: var(--bg-gray);
  color: var(--text-light);
}

.product-pillar-books .product-pillar-tags span { background: var(--primary-light); color: var(--primary); }
.product-pillar-edu .product-pillar-tags span { background: #ecfeff; color: var(--accent); }
.product-pillar-ai .product-pillar-tags span { background: #f3e8ff; color: #7c3aed; }

.product-category {
  margin-bottom: 72px;
}

.product-category:last-child {
  margin-bottom: 0;
}

.product-category-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--border);
}

.product-category-num {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  opacity: 0.15;
  flex-shrink: 0;
}

.product-category-header-books .product-category-num { color: var(--primary); opacity: 0.25; }
.product-category-header-edu .product-category-num { color: var(--accent); opacity: 0.25; }
.product-category-header-ai .product-category-num { color: #7c3aed; opacity: 0.25; }

.product-category-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.product-category-desc {
  font-size: 1rem;
  color: var(--text-light);
}

.product-grid {
  display: grid;
  gap: 24px;
}

.product-grid-4 {
  grid-template-columns: repeat(2, 1fr);
}

.product-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.product-edu-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.product-edu-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
  cursor: pointer;
  position: relative;
}

.product-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.product-card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.product-card h4 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text);
}

.product-card-summary {
  font-size: 0.925rem;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.7;
}

.product-card-features {
  list-style: none;
}

.product-card-features li {
  font-size: 0.875rem;
  color: var(--text-light);
  padding: 5px 0 5px 16px;
  position: relative;
}

.product-card-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 13px;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

.product-card-featured {
  border-color: var(--accent);
  background: linear-gradient(135deg, #fff 0%, #ecfeff 100%);
}

.product-card-featured:hover {
  border-color: var(--accent);
}

.product-card-featured .product-card-features li::before {
  background: var(--accent);
}

.product-card-platform {
  padding: 40px 32px;
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 100%);
  border-color: rgba(26, 86, 219, 0.2);
}

.product-card-platform:hover {
  border-color: var(--primary);
}

.product-card-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  transition: transform 0.2s;
}

.product-card:hover .product-card-more {
  transform: translateX(4px);
}

/* ===== 产品扁平展示 ===== */
.product-showcase-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.product-showcase {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
}

.product-showcase-featured {
  border-color: rgba(8, 145, 178, 0.25);
  background: linear-gradient(135deg, #fff 0%, #ecfeff 100%);
}

.product-showcase-platform {
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 100%);
  border-color: rgba(26, 86, 219, 0.2);
}

.product-showcase-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 28px;
}

.product-showcase-icon {
  font-size: 2.25rem;
  flex-shrink: 0;
  line-height: 1;
}

.product-showcase-head h4 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text);
}

.product-showcase-lead {
  font-size: 1rem;
  color: var(--text-light);
  line-height: 1.8;
  max-width: 720px;
}

.product-showcase-head-main {
  flex: 1;
  min-width: 0;
}

.product-showcase-head-main .product-showcase-lead {
  max-width: none;
}

.product-showcase-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.product-showcase-top h4 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}

.product-showcase-intro-row {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  margin-bottom: 28px;
}

.product-showcase-intro-row .product-showcase-lead {
  flex: 1;
  min-width: 0;
  max-width: none;
  margin: 0;
}

.product-showcase-intro-row .product-showcase-arch {
  flex: 0 0 46%;
  max-width: 500px;
  min-width: 0;
  margin: 0;
}

.product-showcase-arch img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  border: 1px solid rgba(26, 86, 219, 0.12);
  box-shadow: 0 8px 24px rgba(26, 86, 219, 0.08);
}

.product-showcase-arch figcaption {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
  text-align: center;
}

.product-showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.product-showcase-block {
  background: var(--bg-gray);
  border-radius: calc(var(--radius) - 4px);
  padding: 20px;
}

.product-showcase-featured .product-showcase-block {
  background: rgba(255, 255, 255, 0.75);
}

.product-showcase-platform .product-showcase-block {
  background: rgba(255, 255, 255, 0.7);
}

.product-showcase-block h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.product-showcase-block p {
  font-size: 0.875rem;
  color: var(--text-light);
  line-height: 1.65;
}

.product-showcase-scene {
  font-size: 0.925rem;
  color: var(--text-light);
  line-height: 1.7;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.product-showcase-scene strong {
  color: var(--text);
  font-weight: 600;
}

.product-screenshots {
  margin-bottom: 24px;
}

.product-screenshots-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
}

.product-screenshots-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.product-screenshots-grid--single {
  grid-template-columns: 1fr;
}

.product-screenshot {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  overflow: hidden;
  background: #fff;
}

.product-screenshot img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.product-screenshot figcaption {
  padding: 10px 14px;
  font-size: 0.8rem;
  color: var(--text-light);
  background: var(--bg-gray);
  border-top: 1px solid var(--border);
  text-align: center;
}

.product-capabilities {
  margin-bottom: 28px;
}

.product-capability {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
  padding: 24px;
  margin-bottom: 16px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(26, 86, 219, 0.15);
  border-radius: calc(var(--radius) - 4px);
}

.product-capability:last-child {
  margin-bottom: 0;
}

.product-capability-body h5 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 10px;
}

.product-capability-body p {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.75;
}

.product-capability .product-screenshot {
  margin: 0;
}

.product-capability--solo {
  grid-template-columns: 1fr;
}

.product-capability-body code {
  font-size: 0.85em;
  padding: 1px 5px;
  background: rgba(26, 86, 219, 0.08);
  border-radius: 3px;
}

/* ===== 基本资料 ===== */
.profile {
  background: var(--bg-gray);
}

.profile-table-wrap {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.profile-table {
  width: 100%;
  border-collapse: collapse;
}

.profile-table th,
.profile-table td {
  padding: 20px 28px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.profile-table th {
  width: 140px;
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  white-space: nowrap;
}

.profile-table td {
  color: var(--text-light);
  line-height: 1.8;
}

.profile-table tr:last-child th,
.profile-table tr:last-child td {
  border-bottom: none;
}

.profile-note {
  font-size: 0.875rem;
  color: #94a3b8;
}

/* ===== 联系我们 ===== */
.contact-box {
  background: linear-gradient(135deg, var(--primary) 0%, #1e3a5f 100%);
  border-radius: var(--radius);
  padding: 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  color: #fff;
}

.contact-text .section-tag {
  color: rgba(255, 255, 255, 0.7);
}

.contact-text .section-title {
  color: #fff;
  text-align: left;
  margin-bottom: 16px;
}

.contact-text p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.05rem;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
  justify-content: center;
}

.contact-item {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 20px 24px;
}

.contact-label {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.contact-value {
  font-size: 1.05rem;
  font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
  background: #0f172a;
  color: rgba(255, 255, 255, 0.6);
  padding: 32px 0;
  text-align: center;
}

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

.footer-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 8px;
  margin-bottom: 4px;
}

.footer-beian {
  font-size: 0.85rem;
  opacity: 0.7;
}

.footer-contact a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s;
}

.footer-contact a:hover {
  color: #fff;
}

.footer-beian a {
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s;
}

.footer-beian a:hover {
  color: #fff;
}

.footer-beian-sep {
  margin: 0 10px;
  opacity: 0.4;
}

/* ===== 回到顶部 ===== */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.2s;
  z-index: 999;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  transform: translateY(-3px);
  background: var(--primary-dark);
}

/* ===== 滚动动画 ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .product-pillars {
    grid-template-columns: 1fr;
  }

  .product-grid-4,
  .product-grid-2,
  .product-edu-row {
    grid-template-columns: 1fr;
  }

  .product-showcase-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-screenshots-grid:not(.product-screenshots-grid--single) {
    grid-template-columns: repeat(2, 1fr);
  }

  .product-capability {
    grid-template-columns: 1fr;
  }

  .product-showcase-intro-row {
    flex-direction: column;
    gap: 20px;
  }

  .product-showcase-intro-row .product-showcase-arch {
    flex: none;
    max-width: 100%;
    width: 100%;
  }

  .contact-box {
    grid-template-columns: 1fr;
    padding: 40px;
  }

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

@media (max-width: 768px) {
  :root {
    --header-h: 60px;
  }

  .container {
    padding: 0 16px;
  }

  .menu-btn {
    display: flex;
    z-index: 1001;
  }

  .logo-text {
    display: none;
  }

  .logo-img {
    width: 36px;
    height: 36px;
  }

  .nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px;
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    pointer-events: none;
    z-index: 1000;
  }

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

  .nav-link {
    padding: 14px 16px;
    font-size: 1rem;
  }

  .hero-content {
    padding: 48px 16px;
  }

  .hero-logo {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
  }

  .hero-tag {
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    padding: 5px 12px;
    line-height: 1.5;
  }

  .hero-desc {
    font-size: 1rem;
    margin-bottom: 28px;
  }

  .hero-btns {
    margin-bottom: 40px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
    flex: 1 1 auto;
    text-align: center;
    min-width: 140px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-num {
    font-size: 1.5rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .product-pillars {
    margin-bottom: 48px;
    gap: 16px;
  }

  .product-pillar {
    padding: 24px 20px;
  }

  .product-category {
    margin-bottom: 48px;
  }

  .product-showcase-grid {
    grid-template-columns: 1fr;
  }

  .product-screenshots-grid:not(.product-screenshots-grid--single) {
    grid-template-columns: 1fr;
  }

  .copyrights-gallery {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .copyrights-summary {
    gap: 32px;
    margin-bottom: 32px;
  }

  .product-category-header {
    flex-direction: column;
    gap: 8px;
  }

  .product-category-num {
    font-size: 1.75rem;
  }

  .product-category-title {
    font-size: 1.25rem;
  }

  .product-showcase {
    padding: 24px 16px;
  }

  .product-showcase-head {
    flex-direction: column;
    gap: 12px;
  }

  .product-showcase-head h4 {
    font-size: 1.15rem;
  }

  .product-showcase-lead {
    font-size: 0.925rem;
  }

  .product-showcase-block {
    padding: 16px;
  }

  .product-capability {
    padding: 16px;
    gap: 16px;
  }

  .contact-box {
    padding: 32px 20px;
    gap: 32px;
  }

  .contact-text .section-title {
    font-size: 1.5rem;
  }

  .contact-text p {
    font-size: 0.95rem;
  }

  .profile-table th {
    width: 100px;
    font-size: 0.875rem;
    padding: 16px;
  }

  .profile-table td {
    padding: 16px;
    font-size: 0.9rem;
  }

  .footer {
    padding: 24px 0;
  }

  .footer-inner p {
    font-size: 0.875rem;
    padding: 0 8px;
  }

  .footer-contact {
    line-height: 1.8;
    word-break: break-all;
  }

  .footer-beian {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    line-height: 1.6;
  }

  .footer-beian-sep {
    display: none;
  }

  .back-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .hero-btns {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    min-width: unset;
  }

  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .stat-num {
    font-size: 1.25rem;
  }

  .stat-label {
    font-size: 0.75rem;
  }

  .product-pillar-tags span {
    font-size: 0.7rem;
    padding: 3px 8px;
  }
}