:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #121722;
  --bg-card: rgba(22, 28, 42, 0.7);
  --bg-card-hover: rgba(30, 38, 58, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 229, 255, 0.3);
  
  --accent-cyan: #00E5FF;
  --accent-cyan-glow: rgba(0, 229, 255, 0.35);
  --accent-red: #FF3B30;
  --accent-red-glow: rgba(255, 59, 48, 0.35);
  
  --text-primary: #FFFFFF;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

body {
  overflow-x: hidden;
  line-height: 1.6;
  position: relative;
  background: radial-gradient(circle at 15% 15%, rgba(0, 229, 255, 0.08) 0%, transparent 40%),
              radial-gradient(circle at 85% 35%, rgba(255, 59, 48, 0.08) 0%, transparent 45%),
              radial-gradient(circle at 50% 80%, rgba(30, 58, 138, 0.1) 0%, transparent 50%),
              var(--bg-primary);
  min-height: 100vh;
}

/* Background grid line effect */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header & Navigation */
.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 13, 20, 0.75);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.3);
}

.brand-text {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #FFFFFF 30%, #94A3B8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 20px;
  background: rgba(0, 229, 255, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.3);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0097B2 0%, #00E5FF 100%);
  color: #0A0D14;
  box-shadow: 0 4px 18px rgba(0, 229, 255, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 229, 255, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-hero {
  padding: 14px 30px;
  font-size: 16px;
  border-radius: var(--radius-lg);
}

/* Hero Section */
.hero {
  padding: 70px 0 90px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-pill-tag {
  background: var(--accent-red);
  color: #FFF;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 10px;
}

.hero-title {
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.gradient-text {
  background: linear-gradient(135deg, #FFFFFF 0%, #00E5FF 50%, #FF3B30 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 720px;
  margin: 0 auto 36px;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* Handheld Mockup Display */
.hero-mockup-wrapper {
  margin-top: 50px;
  position: relative;
}

.hero-mockup-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 70%;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.25) 0%, rgba(255, 59, 48, 0.15) 50%, transparent 75%);
  filter: blur(60px);
  z-index: 0;
  pointer-events: none;
}

.handheld-device {
  position: relative;
  z-index: 1;
  background: #11141B;
  border-radius: var(--radius-xl);
  padding: 14px;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.8),
              0 0 0 1px rgba(255, 255, 255, 0.12),
              inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  max-width: 1040px;
  margin: 0 auto;
}

/* Joy-Con inspired grips */
.grip-left, .grip-right {
  width: 48px;
  height: 280px;
  border-radius: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  padding: 16px 0;
}

.grip-left {
  background: linear-gradient(180deg, #00819B 0%, #00B5CC 100%);
  margin-right: 12px;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.3);
}

.grip-right {
  background: linear-gradient(180deg, #D62828 0%, #FF3B30 100%);
  margin-left: 12px;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.3);
}

.stick {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #1E232E;
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.4);
}

.dpad-cross {
  width: 22px;
  height: 22px;
  position: relative;
}
.dpad-cross::before, .dpad-cross::after {
  content: "";
  position: absolute;
  background: #1E232E;
  border-radius: 3px;
}
.dpad-cross::before { width: 100%; height: 8px; top: 7px; left: 0; }
.dpad-cross::after { width: 8px; height: 100%; top: 0; left: 7px; }

.abxy-cluster {
  width: 22px;
  height: 22px;
  position: relative;
}
.abxy-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #1E232E;
  position: absolute;
}
.abxy-dot.top { top: 0; left: 8px; }
.abxy-dot.bottom { bottom: 0; left: 8px; }
.abxy-dot.left { left: 0; top: 8px; }
.abxy-dot.right { right: 0; top: 8px; }

.screen-container {
  flex: 1;
  background: #000;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16 / 10;
  box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.9);
}

.screen-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Features Section */
.section {
  padding: 100px 0;
}

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

.section-tag {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  display: inline-block;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.6), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 25px rgba(0, 229, 255, 0.1);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 22px;
}

.icon-cyan {
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.25);
}

.icon-red {
  background: rgba(255, 59, 48, 0.12);
  color: var(--accent-red);
  border: 1px solid rgba(255, 59, 48, 0.25);
}

.icon-purple {
  background: rgba(168, 85, 247, 0.12);
  color: #C084FC;
  border: 1px solid rgba(168, 85, 247, 0.25);
}

.icon-blue {
  background: rgba(59, 130, 246, 0.12);
  color: #60A5FA;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Interactive Showcase Tabs */
.showcase-wrapper {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  padding: 40px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.showcase-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active, .tab-btn:hover {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--accent-cyan);
  color: #FFF;
}

.showcase-screen {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  aspect-ratio: 16 / 10;
  background: #000;
}

.showcase-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Tech Specs Table */
.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.spec-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.spec-label {
  font-size: 14px;
  color: var(--text-secondary);
}

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

/* Download Section */
.download-card {
  background: linear-gradient(135deg, rgba(18, 23, 34, 0.9) 0%, rgba(26, 32, 48, 0.9) 100%);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6), 0 0 50px rgba(0, 229, 255, 0.1);
}

.download-card::after {
  content: "";
  position: absolute;
  bottom: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 59, 48, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.download-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.download-desc {
  max-width: 600px;
  margin: 0 auto 36px;
  color: var(--text-secondary);
  font-size: 16px;
}

/* Modal for Agreements & Policies */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

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

.modal-content {
  background: #121722;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 820px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.8);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 24px;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

.modal-close:hover {
  color: #FFF;
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  font-size: 14.5px;
  color: #CBD5E1;
  line-height: 1.8;
}

.modal-body h4 {
  color: #FFF;
  margin: 20px 0 8px;
  font-size: 16px;
}

.modal-body p {
  margin-bottom: 12px;
}

/* Footer */
.footer {
  background: #080A0F;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
  font-size: 14px;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  max-width: 320px;
  margin-top: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.footer-col h4 {
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-beian a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-beian a:hover {
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 900px) {
  .grip-left, .grip-right {
    display: none;
  }
  .handheld-device {
    padding: 8px;
  }
  .nav-links {
    display: none;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}