@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;600;700&display=swap");

:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-color: #ec4899;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --border-radius: 12px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    "Noto Sans SC",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .section-container {
    padding: 0 16px;
  }
}

/* Header */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.app-header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

@media (max-width: 768px) {
  .header-container {
    padding: 12px 16px;
  }
}

.header-left {
  flex-shrink: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  transition: opacity var(--transition-fast);
}

.logo-link:hover {
  opacity: 0.8;
}

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

@media (max-width: 768px) {
  .logo-img {
    width: 32px;
    height: 32px;
  }
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .logo-text {
    font-size: 16px;
  }
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  background: var(--bg-secondary);
  border-radius: 6px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-normal);
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 768px) {
  .header-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }

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

.nav-item {
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

@media (max-width: 768px) {
  .nav-item {
    width: 100%;
    text-align: center;
    padding: 12px;
  }
}

.nav-item:hover {
  color: var(--primary-color);
  background: var(--bg-secondary);
}

.nav-cta {
  background: var(--gradient-primary);
  color: white !important;
  font-weight: 600;
}

.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Hero Section */
.hero-section {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #f0f4ff 0%, #fdf4ff 100%);
  overflow: hidden;
}

@media (max-width: 768px) {
  .hero-section {
    padding: 120px 0 60px;
  }
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .hero-container {
    padding: 0 16px;
  }
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
}

.hero-text {
  max-width: 560px;
}

@media (max-width: 968px) {
  .hero-text {
    max-width: 100%;
    margin: 0 auto;
  }
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 32px;
  }
}

.hero-tagline {
  font-size: 22px;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .hero-tagline {
    font-size: 18px;
  }
}

.hero-description {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  .hero-description {
    font-size: 16px;
  }
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

@media (max-width: 968px) {
  .hero-actions {
    align-items: center;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
}

.btn-version {
  font-size: 14px;
  opacity: 0.9;
}

.platform-support {
  font-size: 14px;
  color: var(--text-light);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-wrapper {
  position: relative;
  max-width: 500px;
  max-height: 500px;
}

.hero-image {
  max-width: 500px;
  max-height: 500px;
  object-fit: contain;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
}

/* Section Styles */
.features-section,
.gallery-section,
.articles-section,
.testimonials-section {
  padding: 100px 0;
}

@media (max-width: 768px) {
  .features-section,
  .gallery-section,
  .articles-section,
  .testimonials-section {
    padding: 60px 0;
  }
}

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

@media (max-width: 768px) {
  .section-header {
    margin-bottom: 40px;
  }
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .section-title {
    font-size: 28px;
  }
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .section-subtitle {
    font-size: 16px;
  }
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.feature-card {
  background: var(--bg-primary);
  padding: 40px 32px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

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

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: white;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
}

.feature-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .feature-title {
    font-size: 20px;
  }
}

.feature-description {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Gallery */
.gallery-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.gallery-main {
  flex: 1;
  max-width: 800px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-main-image {
  max-width: 500px;
  max-height: 500px;
  object-fit: contain;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
}

.gallery-arrow {
  width: 48px;
  height: 48px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.gallery-arrow:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.gallery-arrow svg {
  width: 24px;
  height: 24px;
}

.gallery-thumbnails {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.gallery-thumb {
  width: 120px;
  height: 90px;
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  border: 3px solid transparent;
  transition: all var(--transition-fast);
  opacity: 0.7;
}

@media (max-width: 768px) {
  .gallery-thumb {
    width: 100px;
    height: 75px;
  }
}

.gallery-thumb:hover {
  opacity: 1;
}

.gallery-thumb.active {
  border-color: var(--primary-color);
  opacity: 1;
}

.gallery-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Articles */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.article-card {
  background: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.article-content {
  padding: 32px;
}

.article-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--text-primary);
  transition: color var(--transition-fast);
}

.article-title a:hover {
  color: var(--primary-color);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.article-date {
  font-size: 14px;
  color: var(--text-light);
}

.article-excerpt {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.article-link {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-color);
  transition: color var(--transition-fast);
}

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

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

@media (max-width: 768px) {
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.testimonial-card {
  background: var(--bg-primary);
  padding: 40px 32px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.testimonial-rating {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
}

.testimonial-rating svg {
  width: 20px;
  height: 20px;
  color: #fbbf24;
}

.testimonial-text {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-style: italic;
}

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

.author-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

/* Footer */
.app-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  .footer-container {
    padding: 0 16px;
  }
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-copyright {
  font-size: 14px;
  color: var(--text-light);
}

/* Responsive */
@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .hero-tagline {
    font-size: 16px;
  }

  .hero-description {
    font-size: 15px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 15px;
  }

  .section-title {
    font-size: 24px;
  }

  .feature-card,
  .testimonial-card {
    padding: 32px 24px;
  }
}