@charset "UTF-8";

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

html {
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: #1A1A2E;
  background: #F5F7FA;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.i-star::before,
.i-users::before,
.i-download::before,
.i-book::before,
.i-heart::before,
.i-cloud::before,
.i-chevron-down::before,
.i-devices::before,
.i-menu::before,
.i-check::before,
.i-speed::before,
.i-quote::before,
.i-close::before,
.i-arrow-right::before,
.i-shield::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 24px;
  vertical-align: middle;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.i-star::before { background-image: url("../icons/star.svg"); }
.i-users::before { background-image: url("../icons/users.svg"); }
.i-download::before { background-image: url("../icons/download.svg"); }
.i-book::before { background-image: url("../icons/book.svg"); }
.i-heart::before { background-image: url("../icons/heart.svg"); }
.i-cloud::before { background-image: url("../icons/cloud.svg"); }
.i-chevron-down::before { background-image: url("../icons/chevron-down.svg"); }
.i-devices::before { background-image: url("../icons/devices.svg"); }
.i-menu::before { background-image: url("../icons/menu.svg"); }
.i-check::before { background-image: url("../icons/check.svg"); }
.i-speed::before { background-image: url("../icons/speed.svg"); }
.i-quote::before { background-image: url("../icons/quote.svg"); }
.i-close::before { background-image: url("../icons/close.svg"); }
.i-arrow-right::before { background-image: url("../icons/arrow-right.svg"); }
.i-shield::before { background-image: url("../icons/shield.svg"); }

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(41, 121, 255, 0.1);
  transition: box-shadow 0.3s ease;
}

.header.scrolled {
  box-shadow: 0 2px 20px rgba(41, 121, 255, 0.12);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.header-logo span {
  font-size: 22px;
  font-weight: 700;
  color: #2979FF;
  letter-spacing: 1px;
}

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

.nav-menu li a {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: #555;
  border-radius: 20px;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  color: #2979FF;
  background: rgba(41, 121, 255, 0.08);
}

.nav-toggle {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  color: #1A1A2E;
}

.nav-toggle i::before {
  width: 28px;
  height: 28px;
}

.hero {
  padding: 140px 0 100px;
  background: linear-gradient(135deg, #2979FF 0%, #1565C0 50%, #0D47A1 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 50%;
}

.hero .container {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.hero-content h1 {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-content h1 span {
  color: #82B1FF;
}

.hero-content p {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-buttons a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-primary {
  background: #fff;
  color: #2979FF;
}

.btn-primary:hover {
  background: #E3F2FD;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

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

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
  transform: translateY(-2px);
}

.section {
  padding: 90px 0;
}

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

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  color: #1A1A2E;
  margin-bottom: 14px;
}

.section-header p {
  font-size: 16px;
  color: #888;
  max-width: 600px;
  margin: 0 auto;
}

.features {
  background: #fff;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: #F5F7FA;
  border-radius: 16px;
  padding: 36px 28px;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.feature-card:hover {
  background: #fff;
  border-color: rgba(41, 121, 255, 0.15);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(41, 121, 255, 0.08);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #2979FF, #1565C0);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: #fff;
}

.feature-icon i::before {
  width: 28px;
  height: 28px;
  filter: brightness(0) invert(1);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 600;
  margin-bottom: 10px;
  color: #1A1A2E;
}

.feature-card p {
  font-size: 14px;
  color: #777;
  line-height: 1.7;
}

.screenshots {
  background: #F0F4FF;
}

.screenshots-scroll {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  padding-bottom: 20px;
  scroll-behavior: smooth;
}

.screenshots-scroll::-webkit-scrollbar {
  height: 8px;
}

.screenshots-scroll::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.screenshots-scroll::-webkit-scrollbar-thumb {
  background: rgba(41, 121, 255, 0.4);
  border-radius: 4px;
}

.screenshots-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(41, 121, 255, 0.6);
}

.screenshot-item {
  flex: 0 0 260px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
}

.screenshot-item:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 36px rgba(41, 121, 255, 0.15);
}

.screenshot-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.advantages {
  background: #fff;
}

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

.advantage-item {
  padding: 32px 20px;
  border-radius: 16px;
  transition: all 0.3s ease;
}

.advantage-item:hover {
  background: #F5F7FA;
}

.advantage-number {
  font-size: 42px;
  font-weight: 800;
  color: #2979FF;
  margin-bottom: 8px;
}

.advantage-label {
  font-size: 15px;
  color: #666;
  font-weight: 500;
}

.download {
  background: linear-gradient(135deg, #1A1A2E 0%, #16213E 100%);
}

.download .section-header h2 {
  color: #fff;
}

.download .section-header p {
  color: rgba(255, 255, 255, 0.65);
}

.download-cards {
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

.download-card {
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 40px 48px;
  text-align: center;
  flex: 0 0 340px;
  transition: all 0.3s ease;
}

.download-card:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.download-card-icon {
  margin-bottom: 20px;
}

.download-card-icon img {
  width: 64px;
  height: 64px;
  margin: 0 auto;
  border-radius: 16px;
}

.download-card h3 {
  font-size: 22px;
  color: #fff;
  margin-bottom: 8px;
}

.download-card .version {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 24px;
}

.download-card .btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 40px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #2979FF, #1565C0);
  transition: all 0.3s ease;
}

.download-card .btn-download:hover {
  background: linear-gradient(135deg, #448AFF, #2979FF);
  box-shadow: 0 8px 30px rgba(41, 121, 255, 0.4);
  transform: translateY(-2px);
}

.btn-download i::before {
  width: 20px;
  height: 20px;
  filter: brightness(0) invert(1);
}

.reviews {
  background: #F5F7FA;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #fff;
  border-radius: 16px;
  padding: 28px;
  transition: all 0.3s ease;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.review-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
  transform: translateY(-3px);
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  color: #FFB300;
}

.review-stars i::before {
  width: 18px;
  height: 18px;
}

.review-text {
  font-size: 14px;
  color: #555;
  line-height: 1.8;
  margin-bottom: 18px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #82B1FF, #2979FF);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}

.review-author-info h4 {
  font-size: 15px;
  font-weight: 600;
  color: #1A1A2E;
}

.review-author-info span {
  font-size: 12px;
  color: #999;
}

.faq {
  background: #fff;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid #eee;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 17px;
  font-weight: 500;
  color: #1A1A2E;
  text-align: left;
  transition: color 0.3s ease;
}

.faq-question:hover {
  color: #2979FF;
}

.faq-question i::before {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question i::before {
  transform: rotate(180deg);
}

.faq-item.active .faq-question {
  color: #2979FF;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 15px;
  color: #666;
  line-height: 1.8;
}

.footer {
  background: #0D1B2A;
  padding: 50px 0 30px;
  color: rgba(255, 255, 255, 0.6);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-brand span {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: #82B1FF;
}

.footer-bottom {
  text-align: center;
  font-size: 13px;
}

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .hero-content h1 {
    font-size: 36px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 16px 20px;
    gap: 4px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.3s ease;
    border-bottom: 2px solid #2979FF;
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-menu li a {
    padding: 12px 16px;
    font-size: 16px;
    border-radius: 10px;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero-content h1 {
    font-size: 30px;
  }

  .hero-content p {
    font-size: 15px;
  }

  .hero-buttons {
    justify-content: center;
  }

  .section {
    padding: 60px 0;
  }

  .section-header h2 {
    font-size: 28px;
  }

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

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

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

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

  .download-cards {
    flex-direction: column;
    align-items: center;
  }

  .download-card {
    flex: 0 0 auto;
    width: 100%;
    max-width: 340px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 26px;
  }

  .hero-buttons a {
    padding: 12px 24px;
    font-size: 14px;
  }

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

  .advantage-number {
    font-size: 32px;
  }

  .screenshot-item {
    flex: 0 0 200px;
  }
}