/* ─── Reset & Base ─── */
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  :root {
    --bg: #f1f4ff;
    --white: #ffffff;
    --ink: #1a1a2e;
    --ink-muted: #5a5a78;
    --accent: #7b68ee;
    --accent-light: #e8e4ff;
    --accent-dark: #5a4fcf;
    --gold: #d4af37;
    --border: rgba(123,104,238,0.15);
    --shadow-sm: 0 2px 12px rgba(123,104,238,0.10);
    --shadow-md: 0 8px 40px rgba(123,104,238,0.16);
    --shadow-lg: 0 20px 60px rgba(123,104,238,0.20);
    --radius: 16px;
    --radius-sm: 8px;
    --serif: 'Cormorant Garamond', Georgia, serif;
    --sans: 'Inter', system-ui, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--ink);
    line-height: 1.6;
    min-height: 100vh;
  }

  /* ─── Header / Nav ─── */
  .site-header {
    background: rgba(241,244,255,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 2rem;
  }
  .nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    height: 64px;
  }
  .nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
  }
  .nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--ink-muted);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color var(--transition);
  }
  .nav-links a:hover { color: var(--accent); }
  .nav-cta {
    background: var(--accent);
    color: var(--white) !important;
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 500;
  }
  .nav-cta:hover { background: var(--accent-dark); color: var(--white) !important; }

  /* ─── Hero Banner ─── */
  .hero-banner {
    max-width: 1280px;
    margin: 2rem auto;
    padding: 0 2rem;
  }
  .hero-banner img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    display: block;
  }

  /* ─── Section Layout ─── */
  .section {
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 2rem 4rem;
  }
  .section-title {
    font-family: var(--serif);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
  }
  .section-subtitle {
    font-size: 1rem;
    color: var(--ink-muted);
    margin-bottom: 2.5rem;
  }
  .divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gold));
    border-radius: 2px;
    margin-bottom: 1rem;
  }

  /* ─── PC Image Grid (16:9 images) ─── */
  .pc-images-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .pc-images-grid img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    display: block;
    transition: transform var(--transition), box-shadow var(--transition);
  }
  .pc-images-grid img:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
  }

  /* ─── Mobile Image Grid (1:1 images) ─── */
  .mobile-images-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  @media (min-width: 768px) {
    .mobile-images-grid {
      grid-template-columns: repeat(4, 1fr);
    }
  }
  .mobile-images-grid img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    display: block;
    transition: transform var(--transition), box-shadow var(--transition);
  }
  .mobile-images-grid img:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-md);
  }

  /* ─── Product Info Panel ─── */
  .product-panel {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
    max-width: 1280px;
    margin: 0 auto;
    padding: 2rem 2rem 4rem;
  }
  @media (min-width: 900px) {
    .product-panel {
      grid-template-columns: 1fr 1fr;
    }
  }
  .product-main-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--white);
  }
  .product-main-image img {
    width: 100%;
    display: block;
  }
  .product-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }
  .product-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--accent-light);
    color: var(--accent-dark);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 0.35rem 0.9rem;
    border-radius: 50px;
    width: fit-content;
  }
  .product-name {
    font-family: var(--serif);
    font-size: 2.6rem;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.02em;
  }
  .product-tagline {
    font-size: 1.05rem;
    color: var(--ink-muted);
    font-style: italic;
  }
  .product-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
  }
  .spec-item { display: flex; flex-direction: column; gap: 0.2rem; }
  .spec-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-muted);
  }
  .spec-value {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--ink);
  }
  .selling-points {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }
  .selling-point-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--ink);
  }
  .sp-icon {
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--accent), var(--gold));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
  }
  .sp-icon svg { width: 11px; height: 11px; fill: white; }
  .cta-group { display: flex; flex-direction: column; gap: 0.75rem; }
  .btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: var(--white);
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    transition: transform var(--transition), box-shadow var(--transition);
    letter-spacing: 0.02em;
  }
  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(123,104,238,0.4);
  }
  .btn-secondary {
    background: var(--white);
    color: var(--accent);
    font-size: 1rem;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: 50px;
    border: 2px solid var(--accent);
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition);
  }
  .btn-secondary:hover {
    background: var(--accent);
    color: var(--white);
  }

  /* ─── Feature Cards ─── */
  .feature-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  @media (min-width: 768px) {
    .feature-cards { grid-template-columns: repeat(4, 1fr); }
  }
  .feature-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.75rem 1.25rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition);
  }
  .feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
  }
  .feature-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
  }
  .feature-title {
    font-family: var(--serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
  }
  .feature-desc {
    font-size: 0.83rem;
    color: var(--ink-muted);
    line-height: 1.5;
  }

  /* ─── Image Pair Row (PC) ─── */
  .image-pair {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
  }
  @media (min-width: 768px) {
    .image-pair { grid-template-columns: 1fr 1fr; }
  }
  .image-pair img, .image-single img {
    width: 100%;
    border-radius: var(--radius);
    display: block;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
  }
  .image-pair img:hover, .image-single img:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
  }

  /* ─── Image Captions ─── */
  .img-caption-block { position: relative; }
  .img-caption {
    font-size: 0.8rem;
    color: var(--ink-muted);
    text-align: center;
    margin-top: 0.5rem;
  }

  /* ─── FAQ ─── */
  .faq-section {
    max-width: 860px;
    margin: 0 auto;
    padding: 2rem 2rem 6rem;
  }
  .faq-list { display: flex; flex-direction: column; gap: 1rem; }
  .faq-item {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    overflow: hidden;
  }
  .faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.25rem 1.5rem;
    text-align: left;
    font-family: var(--sans);
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: color var(--transition);
  }
  .faq-question:hover { color: var(--accent); }
  .faq-question .arrow {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: transform var(--transition);
  }
  .faq-question .arrow svg {
    width: 10px;
    height: 10px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: transform var(--transition);
  }
  .faq-item.open .faq-question .arrow svg {
    transform: rotate(180deg);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1);
  }
  .faq-item.open .faq-answer {
    max-height: 400px;
  }
  .faq-answer-inner {
    padding: 0 1.5rem 1.5rem;
    font-size: 0.93rem;
    color: var(--ink-muted);
    line-height: 1.7;
  }
  .faq-answer-inner a {
    color: var(--accent);
    text-decoration: underline;
  }

  /* ─── CTA Strip ─── */
  .cta-strip {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border-radius: var(--radius);
    margin: 0 2rem 4rem;
    max-width: calc(1280px - 4rem);
    margin-left: auto;
    margin-right: auto;
    padding: 3.5rem 2.5rem;
    text-align: center;
    color: var(--white);
    box-shadow: var(--shadow-lg);
  }
  .cta-strip h2 {
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
  }
  .cta-strip p {
    font-size: 1rem;
    opacity: 0.85;
    margin-bottom: 2rem;
  }
  .btn-white {
    background: var(--white);
    color: var(--accent-dark);
    font-size: 1rem;
    font-weight: 700;
    padding: 0.9rem 2.5rem;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: transform var(--transition), box-shadow var(--transition);
    letter-spacing: 0.02em;
  }
  .btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  }

  /* ─── Footer ─── */
  .site-footer {
    background: var(--ink);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: 2.5rem 2rem;
    font-size: 0.85rem;
  }

  /* ─── Breadcrumb ─── */
  .breadcrumb {
    max-width: 1280px;
    margin: 1rem auto 0;
    padding: 0 2rem;
    font-size: 0.8rem;
    color: var(--ink-muted);
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
  }
  .breadcrumb a { color: var(--ink-muted); text-decoration: none; }
  .breadcrumb a:hover { color: var(--accent); }
  .breadcrumb span { color: var(--ink); font-weight: 500; }

  /* ─── Trust Bar ─── */
  .trust-bar {
    background: var(--white);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
  }
  .trust-bar-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
  }
  .trust-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.83rem;
    font-weight: 500;
    color: var(--ink-muted);
  }
  .trust-item .ti-icon { font-size: 1rem; }

  /* ─── Glitter Animation ─── */
  @keyframes sparkle {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
  }
  .sparkle-dot {
    display: inline-block;
    animation: sparkle 1.8s infinite;
  }
  .sparkle-dot:nth-child(2) { animation-delay: 0.3s; }
  .sparkle-dot:nth-child(3) { animation-delay: 0.6s; }

  /* ─── Responsive ─── */
  @media (max-width: 640px) {
    .nav-links { display: none; }
    .section-title { font-size: 1.75rem; }
    .product-name { font-size: 2rem; }
    .product-specs { grid-template-columns: 1fr; }
    .cta-strip { padding: 2.5rem 1.5rem; }
    .cta-strip h2 { font-size: 1.5rem; }
  }