/* ------------------------------
   Global
------------------------------ */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: #0a0f1a;
  color: #fff;
}

a {
  text-decoration: none;
}

/* ------------------------------
   Navbar
------------------------------ */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 1000;
  background: transparent;
  transition: background 0.3s ease, box-shadow 0.3s ease;
}
.navbar.scrolled {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}
.nav-logo {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

/* nav-menu 容器 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* 基础样式：适配深色背景 */
.nav-menu a {
  position: relative;
  padding-bottom: 4px;
  color: #f0f0f0;             /* ★ 更亮的默认颜色（适合深蓝背景） */
  text-decoration: none;
  transition: color 0.25s ease;
}

/* 覆盖 visited 紫色 */
.nav-menu a:visited {
  color: #f0f0f0;
}

/* 悬停时文字颜色 */
.nav-menu a:hover {
  color: #4a90e2;
}

/* 下划线基础（hover & active 共用） */
.nav-menu a::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: #4a90e2;
  transform: translateX(-50%);
  transition: width 0.3s ease;
}

/* 悬停动画：从中间向两边展开 */
.nav-menu a:hover::after {
  width: 100%;
}

/* 当前页面高亮 */
.nav-menu a.active {
  color: #4a90e2;
  font-weight: 600;
}

/* 当前页面的下划线（从中间向两端展开） */
.nav-menu a.active::after {
  width: 100%;
}

.nav-btn {
  padding: 8px 16px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 6px;
  backdrop-filter: blur(4px);
  white-space: nowrap;
}
.lang-switch {
  margin-left: 20px;
  font-size: 0.9rem;
  opacity: 0.8;
}

.lang-switch a {
  color: #fff;
  margin: 0 4px;
  transition: 0.2s;
}

.lang-switch a:hover {
  opacity: 1;
}

/* ------------------------------
   Hero
------------------------------ */
.hero {
  position: relative;
  width: 100%;
  height: 90vh;
  background: url('/images/hero.png') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 45%;
  background: linear-gradient(to bottom, rgba(0,0,0,0.55), rgba(0,0,0,0));
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 800px;
  padding: 0 20px;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 0 2px 6px rgba(0,0,0,0.4);
}

.hero p {
  font-size: 1.3rem;
  opacity: 0.9;
  margin-bottom: 30px;
}

.hero-btn {
  display: inline-block;
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  backdrop-filter: blur(4px);
  transition: 0.25s;
}

.hero-btn:hover {
  background: rgba(0, 150, 255, 1);
}

/* ------------------------------
   Solutions
------------------------------ */
.solutions {
  padding: 120px 60px;
  background: #0a0f1a;
  text-align: center;
}

.solutions h2 {
  font-size: 2.6rem;
  margin-bottom: 60px;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.solution-card {
  background: rgba(255, 255, 255, 0.06);
  padding: 40px;
  border-radius: 14px;
  text-align: left;
  backdrop-filter: blur(6px);
  transition: 0.3s;
}

.solution-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.12);
}

.solution-card h3 {
  font-size: 1.6rem;
  margin-bottom: 16px;
}

.solution-card p {
  opacity: 0.85;
  margin-bottom: 20px;
}

.solution-card a {
  color: #00aaff;
  font-weight: 600;
}

/* ------------------------------
   Platform Section
------------------------------ */
.platform {
  padding: 120px 60px;
  background: #0d1320;
  text-align: center;
}

.platform h2 {
  font-size: 2.6rem;
  margin-bottom: 20px;
}

.platform-subtitle {
  font-size: 1.2rem;
  opacity: 0.85;
  max-width: 700px;
  margin: 0 auto 60px;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto 60px;
}

.platform-card {
  background: rgba(255, 255, 255, 0.06);
  padding: 32px;
  border-radius: 14px;
  text-align: left;
  backdrop-filter: blur(6px);
  transition: 0.3s;
}

.platform-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.12);
}

.platform-card h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.platform-card p {
  opacity: 0.85;
}

.platform-btn {
  display: inline-block;
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  backdrop-filter: blur(4px);
  transition: 0.25s;
}

.platform-btn:hover {
  background: rgba(0, 150, 255, 1);
}

/* Use Cases */
.usecases {
  padding: 120px 60px;
  background: #0b0f1a;
  text-align: center;
}

.usecases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 40px auto 0;
}

.usecase-card {
  background: rgba(255, 255, 255, 0.06);
  padding: 32px;
  border-radius: 14px;
  text-align: left;
  transition: 0.3s;
}

.usecase-card:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.12);
}

/* About */
.about {
  padding: 120px 60px;
  text-align: center;
}

.about-desc {
  max-width: 800px;
  margin: 20px auto 0;
  opacity: 0.85;
}

/* Contact */
.contact {
  padding: 120px 60px;
  background: #0d1320;
  text-align: center;
}

.contact-desc {
  max-width: 700px;
  margin: 20px auto 40px;
  opacity: 0.85;
}

.contact-btn {
  display: inline-block;
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  transition: 0.25s;
}

.contact-btn:hover {
  background: rgba(0, 150, 255, 1);
}

/* For All Pages */

.page-hero {
  padding: 120px 60px;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.6rem;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.2rem;
  opacity: 0.85;
  max-width: 700px;
  margin: 0 auto;
}


.section-desc {
  max-width: 700px;
  margin: 20px auto 40px;
  opacity: 0.85;
}






/* ------------------------------
   Products Page — List Container
------------------------------ */
.product-list {
  padding: 100px 60px;
  max-width: 900px;
  margin: 0 auto;
}

/* ------------------------------
   Products Page — Each Product Item
------------------------------ */
.product-item {
  margin-bottom: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.product-item h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.product-item p {
  opacity: 0.85;
  line-height: 1.7;
}


/* Solutions Page */
.solutions-page {
  padding: 100px 60px;
  max-width: 900px;
  margin: 0 auto;
}

.solution-item {
  margin-bottom: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.solution-item h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.solution-item p {
  opacity: 0.85;
  line-height: 1.7;
}

.solutions-btn {
  display: inline-block;
  margin-top: 40px;
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  transition: 0.25s;
}

.solutions-btn:hover {
  background: rgba(0, 150, 255, 1);
}



/* ------------------------------
   Platform Page — Hero复用
------------------------------ */

/* ------------------------------
   Platform Page — Sections
------------------------------ */
.platform-section {
  padding: 100px 60px;
  text-align: center;
}

/* ------------------------------
   Platform Page — Grid Cards
   (复用首页的 platform-grid / platform-card)
------------------------------ */

/* ------------------------------
   Platform Page — List Items
------------------------------ */
.platform-list {
  max-width: 700px;
  margin: 0 auto;
  text-align: left;
  line-height: 1.8;
  opacity: 0.9;
}

.platform-list li {
  margin-bottom: 12px;
}


/* ------------------------------
   Use Cases Page
------------------------------ */
.usecases-page {
  padding: 100px 60px;
  max-width: 900px;
  margin: 0 auto;
}

.usecase-item {
  margin-bottom: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.usecase-item h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.usecase-item p {
  opacity: 0.85;
  line-height: 1.7;
}

.usecases-btn {
  display: inline-block;
  margin-top: 40px;
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  transition: 0.25s;
}

.usecases-btn:hover {
  background: rgba(0, 150, 255, 1);
}

/* ------------------------------
   About Page
------------------------------ */
.about-section {
  padding: 80px 60px;
  text-align: center;
}

.about-values {
  max-width: 700px;
  margin: 20px auto 0;
  text-align: left;
  line-height: 1.8;
  opacity: 0.9;
}

.about-values li {
  margin-bottom: 12px;
}

/* ------------------------------
   Contact Page
------------------------------ */
.contact-page {
  padding: 100px 60px;
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 60px;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: 8px;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 1rem;
}

.contact-form textarea {
  height: 160px;
  resize: vertical;
}

.contact-form button {
  padding: 14px 32px;
  background: rgba(0, 150, 255, 0.85);
  border-radius: 8px;
  color: #fff;
  font-size: 1.1rem;
  border: none;
  cursor: pointer;
  transition: 0.25s;
}

.contact-form button:hover {
  background: rgba(0, 150, 255, 1);
}

/* Contact Info */
.contact-info {
  text-align: left;
  opacity: 0.9;
}

.contact-info h2 {
  margin-bottom: 16px;
}

.contact-info p {
  margin-bottom: 8px;
}