:root {
  --dm-primary: #1a56db;
  --dm-primary-dark: #1340af;
  --dm-primary-light: #e8f0fe;
  --dm-dark: #0f172a;
  --dm-accent: #f59e0b;
  --dm-gray-50: #f9fafb;
  --dm-gray-100: #f3f4f6;
  --dm-gray-200: #e5e7eb;
  --dm-gray-300: #d1d5db;
  --dm-gray-500: #6b7280;
  --dm-gray-600: #4b5563;
  --dm-gray-700: #374151;
  --dm-gray-800: #1f2937;
  --dm-gray-900: #111827;
  --dm-radius: 12px;
  --dm-card-w: 380px;
  --dm-card-h: 440px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--dm-gray-50); color: var(--dm-gray-800); font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }

.dm-nav { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--dm-gray-200); padding: 14px 0; }
.dm-nav-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.dm-nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--dm-gray-900); }
.dm-nav-logo .icon-box { width: 38px; height: 38px; background: var(--dm-primary); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; }
.dm-nav-logo .logo-name { font-size: 20px; font-weight: 800; letter-spacing: -0.5px; }
.dm-nav-logo .logo-name span { color: var(--dm-primary); }
.dm-nav-links { display: flex; gap: 28px; align-items: center; }
.dm-nav-links a { text-decoration: none; color: var(--dm-gray-600); font-size: 14px; font-weight: 500; transition: color 0.2s; }
.dm-nav-links a:hover { color: var(--dm-primary); }
.dm-nav-links a.active { color: var(--dm-primary); font-weight: 600; }
.dm-nav-cta { background: var(--dm-primary); color: #fff !important; padding: 8px 18px; border-radius: 8px; }
.dm-nav-cta:hover { background: var(--dm-primary-dark) !important; }

.dm-hero { text-align: center; padding: 64px 24px 28px; max-width: 760px; margin: 0 auto; }
.dm-hero h1 { font-size: clamp(30px, 5vw, 44px); font-weight: 800; letter-spacing: -1px; color: var(--dm-gray-900); }
.dm-hero > p { margin-top: 12px; font-size: 18px; color: var(--dm-gray-600); }
.dm-hero .dm-hero-note { font-size: 14px; color: var(--dm-gray-500); }

.dm-section { max-width: 900px; margin: 0 auto; padding: 12px 24px 56px; }

.dm-toggle { display: flex; justify-content: center; gap: 8px; margin-bottom: 36px; }
.dm-toggle-btn { font-family: inherit; font-size: 15px; font-weight: 600; padding: 12px 26px; border-radius: 999px; border: 1.5px solid var(--dm-gray-200); background: #fff; color: var(--dm-gray-600); cursor: pointer; transition: all 0.2s; }
.dm-toggle-btn:hover { border-color: var(--dm-primary); color: var(--dm-primary); }
.dm-toggle-btn.active { background: var(--dm-gray-900); border-color: var(--dm-gray-900); color: #fff; }

.dm-deck-area { display: flex; align-items: center; justify-content: center; gap: 14px; }
.dm-arrow { font-family: inherit; width: 46px; height: 46px; flex: 0 0 46px; border-radius: 50%; border: 1.5px solid var(--dm-gray-200); background: #fff; color: var(--dm-gray-700); font-size: 24px; line-height: 1; cursor: pointer; transition: all 0.2s; }
.dm-arrow:hover { border-color: var(--dm-primary); color: var(--dm-primary); transform: scale(1.06); }
.dm-arrow:active { transform: scale(0.96); }

.dm-deck { display: flex; flex-direction: column; align-items: center; gap: 18px; }
.dm-scene { perspective: 1400px; width: var(--dm-card-w); height: var(--dm-card-h); }
.dm-card { position: relative; width: 100%; height: 100%; cursor: pointer; transition: transform 0.6s cubic-bezier(0.4, 0.1, 0.2, 1); transform-style: preserve-3d; }
.dm-card.flipped { transform: rotateY(180deg); }
.dm-face { position: absolute; inset: 0; border-radius: 18px; backface-visibility: hidden; -webkit-backface-visibility: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 28px; }
.dm-front { background: linear-gradient(160deg, #ffffff 0%, var(--dm-primary-light) 100%); border: 1px solid var(--dm-gray-200); box-shadow: 0 18px 40px rgba(15, 23, 42, 0.10); }
.dm-front::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px; border-radius: 18px 18px 0 0; background: linear-gradient(90deg, var(--dm-primary), var(--dm-accent)); }
.dm-back { background: linear-gradient(160deg, var(--dm-gray-900) 0%, #1e293b 100%); color: #e5e7eb; transform: rotateY(180deg); box-shadow: 0 18px 40px rgba(15, 23, 42, 0.22); }
.dm-back::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px; border-radius: 18px 18px 0 0; background: linear-gradient(90deg, var(--dm-accent), var(--dm-primary)); }

.dm-step-num { position: absolute; top: 16px; right: 20px; font-size: 12px; font-weight: 700; letter-spacing: 0.5px; color: var(--dm-gray-500); }
.dm-emoji { font-size: 64px; line-height: 1; margin-bottom: 18px; }
.dm-front h2 { font-size: 23px; font-weight: 800; letter-spacing: -0.4px; color: var(--dm-gray-900); }
.dm-front p { margin-top: 10px; font-size: 13.5px; color: var(--dm-gray-500); font-style: italic; }
.dm-back-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--dm-accent); margin-bottom: 12px; }
.dm-back p { font-size: 15.5px; line-height: 1.65; }
.dm-back-hint { margin-top: 18px; font-size: 12px; color: rgba(229, 231, 235, 0.55); font-style: italic; }

.dm-dots { display: flex; gap: 8px; }
.dm-dot { width: 9px; height: 9px; border-radius: 50%; border: none; background: var(--dm-gray-300); cursor: pointer; padding: 0; transition: all 0.2s; }
.dm-dot:hover { background: var(--dm-gray-500); }
.dm-dot.active { background: var(--dm-primary); transform: scale(1.35); }

.dm-play { font-family: inherit; font-size: 13px; font-weight: 600; padding: 8px 18px; border-radius: 999px; border: 1.5px solid var(--dm-gray-200); background: #fff; color: var(--dm-gray-600); cursor: pointer; transition: all 0.2s; }
.dm-play:hover { border-color: var(--dm-primary); color: var(--dm-primary); }
.dm-swipe-hint { text-align: center; margin-top: 22px; font-size: 13px; color: var(--dm-gray-500); }

.dm-cta { text-align: center; padding: 8px 24px 56px; }
.dm-cta h3 { font-size: 24px; font-weight: 800; color: var(--dm-gray-900); margin-bottom: 16px; }
.dm-cta-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.dm-btn { display: inline-block; text-decoration: none; font-size: 15px; font-weight: 600; padding: 12px 28px; border-radius: 10px; border: 1.5px solid var(--dm-gray-200); background: #fff; color: var(--dm-gray-700); transition: all 0.2s; }
.dm-btn:hover { border-color: var(--dm-primary); color: var(--dm-primary); transform: translateY(-1px); }
.dm-btn.primary { background: var(--dm-primary); border-color: var(--dm-primary); color: #fff; }
.dm-btn.primary:hover { background: var(--dm-primary-dark); color: #fff; }

.dm-footer { border-top: 1px solid var(--dm-gray-200); padding: 28px 24px; text-align: center; font-size: 13.5px; color: var(--dm-gray-500); }
.dm-footer a { color: var(--dm-gray-700); text-decoration: none; }
.dm-footer a:hover { color: var(--dm-primary); }

@media (max-width: 760px) {
  :root { --dm-card-w: min(88vw, 340px); --dm-card-h: 420px; }
  .dm-nav-links a:not(.dm-nav-cta):not(.active) { display: none; }
  .dm-nav-links { gap: 14px; }
  .dm-emoji { font-size: 54px; }
  .dm-toggle-btn { font-size: 13.5px; padding: 10px 18px; }
  .dm-arrow { width: 40px; flex-basis: 40px; height: 40px; }
}