/* Modern REO SEO Landing Page Stylesheet for TiSonic C83Pro Bluetooth 5.4 Adapter (Shopee Redirection) */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Noto+Sans+TC:wght@400;500;700;900&display=swap');

:root {
  --bg-dark: #080c14;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --primary-shopee: #ee4d2d;
  --primary-shopee-hover: #d73211;
  --cyan-glow: #00f0ff;
  --blue-accent: #3b82f6;
  --accent-green: #10b981;
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-sub: #d1d5db;
  --border-color: rgba(255, 255, 255, 0.1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-main: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
  --font-family: 'Plus Jakarta Sans', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

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

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

/* Announcement Top Bar */
.announcement-bar {
  background: linear-gradient(90deg, #9a1c06, #ee4d2d, #9a1c06);
  color: #ffffff;
  text-align: center;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.countdown-box {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  background: rgba(0, 0, 0, 0.4);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-family: monospace;
  font-weight: 700;
  color: #fbbf24;
}

/* Navigation Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 12, 20, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 24px;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 1.4rem;
  font-weight: 800;
}

.brand-badge {
  background: linear-gradient(135deg, #ee4d2d, #ff7355);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
  list-style: none;
}

.nav-links a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #00f0ff;
}

.btn-nav-buy {
  background: linear-gradient(135deg, #ee4d2d, #f53d2d);
  color: white;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 800;
  font-size: 0.92rem;
  box-shadow: 0 4px 14px rgba(238, 77, 45, 0.45);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-nav-buy:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(238, 77, 45, 0.65);
  color: white;
}

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

.section {
  padding: 80px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 240, 255, 0.1);
  color: #00f0ff;
  border: 1px solid rgba(0, 240, 255, 0.3);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

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

/* HERO SECTION */
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: start;
  padding-top: 30px;
}

.hero-gallery {
  position: sticky;
  top: 90px;
}

.gallery-main {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-main);
  aspect-ratio: 4 / 3;
}

.gallery-main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.3s ease;
}

.gallery-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(0, 240, 255, 0.85);
  color: #000;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 6px;
}

.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 14px;
}

.thumb-item {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  background: var(--bg-card);
  transition: all 0.2s;
}

.thumb-item.active,
.thumb-item:hover {
  border-color: #ee4d2d;
  transform: translateY(-2px);
}

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

/* HERO CONTENT */
.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.store-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.badge-shopee {
  background: #ee4d2d;
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
}

.rating-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-sub);
}

.stars {
  color: #fbbf24;
  letter-spacing: 1px;
}

.product-title {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-main);
}

.price-card {
  background: linear-gradient(145deg, rgba(31, 41, 55, 0.8), rgba(17, 24, 39, 0.95));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 18px 24px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}

.current-price {
  font-size: 2.2rem;
  font-weight: 800;
  color: #ff7355;
}

.original-price {
  font-size: 1.1rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.discount-badge {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* Variant Selector */
.variant-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.variant-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.variant-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.variant-btn:hover {
  border-color: #ff7355;
}

.variant-btn.active {
  border-color: #ee4d2d;
  background: rgba(238, 77, 45, 0.15);
  color: #ff7355;
  box-shadow: 0 0 12px rgba(238, 77, 45, 0.25);
}

/* Feature Bullets */
.bullet-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.bullet-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-sub);
}

.bullet-icon {
  color: var(--accent-green);
  font-weight: bold;
}

/* Shopee Redirect CTA */
.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.btn-primary-shopee {
  flex: 1;
  min-width: 240px;
  background: linear-gradient(135deg, #ee4d2d, #f53d2d);
  color: white;
  border: none;
  padding: 16px 28px;
  border-radius: var(--radius-md);
  font-size: 1.15rem;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(238, 77, 45, 0.45);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  text-align: center;
}

.btn-primary-shopee:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(238, 77, 45, 0.65);
  color: white;
}

.btn-secondary-demo {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-secondary-demo:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.guarantee-row {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* DUAL AUDIO MODE INTERACTIVE SIMULATOR */
.simulator-bg {
  background: linear-gradient(180deg, #080c14 0%, #0f172a 100%);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.mode-toggle-box {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 30px;
}

.mode-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.mode-tab-btn.active {
  background: linear-gradient(135deg, #00f0ff, #3b82f6);
  color: #000;
  border-color: #00f0ff;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
}

.interactive-demo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: var(--shadow-main);
}

.demo-flex {
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: 20px;
  flex-wrap: wrap;
}

.device-box {
  background: #1e293b;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  min-width: 180px;
}

.device-icon {
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.signal-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: #00f0ff;
  font-weight: bold;
}

.arrow-pulse {
  font-size: 1.4rem;
  animation: arrow-wave 1.5s infinite;
}

@keyframes arrow-wave {
  0%, 100% { transform: translateX(-4px); opacity: 0.5; }
  50% { transform: translateX(4px); opacity: 1; }
}

/* FEATURES GRID */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s;
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 240, 255, 0.4);
}

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  background: rgba(0, 240, 255, 0.12);
  border: 1px solid rgba(0, 240, 255, 0.3);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-heading {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-text {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* COMPARISON TABLE */
.table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
}

.compare-table th,
.compare-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.compare-table th {
  background: #0f172a;
  color: var(--text-main);
  font-weight: 700;
}

.compare-table th.highlight-col,
.compare-table td.highlight-col {
  background: rgba(238, 77, 45, 0.1);
  border-left: 2px solid var(--primary-shopee);
  border-right: 2px solid var(--primary-shopee);
}

.check-green {
  color: var(--accent-green);
  font-weight: bold;
}

.cross-red {
  color: #f87171;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}

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

.avatar-circle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ee4d2d, #00f0ff);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}

.user-name {
  font-size: 0.95rem;
  font-weight: 700;
}

.user-verified {
  font-size: 0.78rem;
  color: var(--accent-green);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s;
  color: #00f0ff;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px 24px;
}

/* FOOTER */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 0 100px;
  background: #05080f;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

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

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

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

/* STICKY MOBILE BAR */
.sticky-buy-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(11, 16, 26, 0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-color);
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 99;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.sticky-buy-bar.show {
  transform: translateY(0);
}

.sticky-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ff7355;
}

.sticky-title {
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; }
  .features-grid, .reviews-grid { grid-template-columns: 1fr; }
  .hero-gallery { position: static; }
  .bullet-list { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .nav-links { display: none; }
  .product-title { font-size: 1.4rem; }
  .current-price { font-size: 1.8rem; }
}