/* Modern High-End Styling for App Official Landing Page */
:root {
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: #EEF2FF;
  --accent: #10B981;
  --accent-gold: #F59E0B;
  --dark-bg: #0F172A;
  --dark-card: #1E293B;
  --text-main: #0F172A;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  --border: #E2E8F0;
  --card-bg: #FFFFFF;
  --gradient-hero: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #EC4899 100%);
  --gradient-dark: linear-gradient(180deg, #0F172A 0%, #1E1B4B 100%);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 50px -10px rgba(79, 70, 229, 0.35);
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  color: var(--text-main);
  background-color: #FAFAFA;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
}

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

/* Header */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: all 0.3s ease;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  object-fit: cover;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.2s ease;
}

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

.btn-header {
  background: var(--primary);
  color: #fff;
  padding: 10px 22px;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-header:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

/* Hero Section */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
              radial-gradient(circle at 20% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 20px;
  border: 1px solid rgba(79, 70, 229, 0.2);
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -1.5px;
  color: var(--text-main);
  margin-bottom: 20px;
}

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

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  line-height: 1.7;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 28px;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  padding: 16px 32px;
  border-radius: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.4);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(79, 70, 229, 0.5);
}

.btn-secondary {
  background: #fff;
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 16px 28px;
  border-radius: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-secondary:hover {
  background: #F8FAFC;
  border-color: #CBD5E1;
  transform: translateY(-2px);
}

.meta-info {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.meta-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* Phone Mockup Frame */
.mockup-container {
  display: flex;
  justify-content: center;
  position: relative;
}

.mockup-glow {
  position: absolute;
  width: 320px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, rgba(236, 72, 153, 0.15) 50%, transparent 80%);
  filter: blur(50px);
  z-index: 0;
}

.phone-mockup {
  position: relative;
  width: 300px;
  height: 620px;
  background: #1E293B;
  border-radius: 44px;
  padding: 10px;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.3),
              0 0 0 1px rgba(255, 255, 255, 0.1) inset;
  z-index: 1;
  transition: transform 0.4s ease;
}

.phone-mockup:hover {
  transform: translateY(-6px) scale(1.01);
}

.phone-notch {
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 18px;
  background: #0F172A;
  border-radius: 12px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 36px;
  overflow: hidden;
  background: #000;
  position: relative;
}

.screen-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}

.screen-slide.active {
  opacity: 1;
}

.mockup-controls {
  position: absolute;
  bottom: -40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #CBD5E1;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mockup-dot.active {
  width: 28px;
  border-radius: 10px;
  background: var(--primary);
}

/* Stats Section */
.stats-section {
  padding: 40px 0;
  background: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -1px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* Features Grid */
.features-section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: #CBD5E1;
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 24px;
  background: var(--primary-light);
}

.feature-card:nth-child(2) .feature-icon-box {
  background: #ECFDF5;
}

.feature-card:nth-child(3) .feature-icon-box {
  background: #FFFBEB;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Interactive Tabs Section */
.interactive-section {
  padding: 80px 0 100px;
  background: #F8FAFC;
  border-top: 1px solid var(--border);
}

.tabs-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}

.tab-btn {
  padding: 12px 26px;
  border-radius: 9999px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
}

.tab-content {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.tab-content.active {
  display: grid;
}

.tab-info h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 18px;
  color: var(--text-main);
}

.tab-info p {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.tab-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tab-points li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--text-main);
}

.tab-check {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #DEF7EC;
  color: #03543F;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 900;
}

.tab-img-preview {
  display: flex;
  justify-content: center;
}

.tab-preview-card {
  width: 320px;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 4px solid #fff;
}

.tab-preview-card img {
  width: 100%;
  display: block;
}

/* Security Banner */
.security-banner {
  padding: 80px 0;
  background: var(--dark-bg);
  color: #fff;
  border-radius: var(--radius-xl);
  margin: 60px 24px;
  position: relative;
  overflow: hidden;
}

.security-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  padding: 0 40px;
}

.security-badge {
  color: #34D399;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}

.security-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 18px;
}

.security-text {
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.security-badges-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.security-pill {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 8px 18px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #E2E8F0;
}

/* FAQ Accordion */
.faq-section {
  padding: 80px 0 100px;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-header {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  user-select: none;
}

.faq-icon {
  font-size: 18px;
  transition: transform 0.3s ease;
}

.faq-body {
  padding: 0 24px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  display: none;
  line-height: 1.6;
}

.faq-item.open .faq-body {
  display: block;
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

/* CTA Download Footer */
.download-footer {
  padding: 100px 0 80px;
  background: var(--gradient-hero);
  color: #fff;
  text-align: center;
  position: relative;
}

.download-footer h2 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.download-footer p {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin: 0 auto 36px;
}

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

.btn-white {
  background: #fff;
  color: var(--primary);
  padding: 16px 36px;
  border-radius: 16px;
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

/* Footer Bottom */
.footer-bottom {
  background: #0B0F19;
  color: var(--text-light);
  padding: 30px 0;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* Modal Popup */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: #fff;
  border-radius: 24px;
  padding: 36px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: #F1F5F9;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 16px;
  cursor: pointer;
}

.qr-placeholder {
  width: 200px;
  height: 200px;
  margin: 20px auto;
  border-radius: 16px;
  background: #F8FAFC;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

.qr-placeholder img {
  width: 100%;
  height: 100%;
  border-radius: 8px;
}

/* Responsive */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-badge, .cta-group, .meta-info {
    justify-content: center;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .tab-content {
    grid-template-columns: 1fr;
  }
  .security-grid {
    grid-template-columns: 1fr;
    padding: 0 20px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-links {
    display: none;
  }
}