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

:root {
  --brand: #0066CC;
  --brand-deep: #004499;
  --brand-cyan: #0088CC;
  --ink: #1A1A2E;
  --ink-soft: #4A6079;
}

body {
  font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #1a2a4a;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.page {
  width: 780px;
  height: 1060px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.35);
  page-break-after: always;
  page-break-inside: avoid;
}

/* ==================== DARK COVER (Front & Back) ==================== */
.dark-cover {
  background: linear-gradient(170deg, #0a1628 0%, #0d1e3c 20%, #112a4a 45%, #0d1e3c 70%, #0a1628 100%);
  color: #fff;
}

.dark-cover::before {
  content: '';
  position: absolute; inset: 0; z-index: 2; pointer-events: none;
  background:
    radial-gradient(ellipse 65% 40% at 50% 38%, rgba(0,180,255,0.06) 0%, transparent 55%),
    radial-gradient(ellipse 35% 25% at 20% 30%, rgba(0,160,255,0.04) 0%, transparent 50%),
    radial-gradient(circle 350px at 80% 25%, rgba(0,140,220,0.08) 0%, transparent 100%),
    radial-gradient(circle 250px at 85% 75%, rgba(0,120,200,0.05) 0%, transparent 100%);
}

.dark-cover .dc-bg-pattern {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background-image:
    url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='40' cy='40' r='1' fill='rgba(0,200,255,0.12)'/%3E%3C/svg%3E");
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 75% 55% at 50% 45%, black 40%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 75% 55% at 50% 45%, black 40%, transparent 75%);
}

.dark-top-bar {
  position: absolute; top: 0; left: 0; right: 0; height: 5px;
  background: linear-gradient(90deg,
    rgba(0,180,255,0.8) 0%, rgba(0,160,240,0.7) 15%,
    rgba(0,140,220,0.5) 35%, rgba(0,120,200,0.4) 50%,
    rgba(0,140,220,0.5) 65%, rgba(0,160,240,0.7) 85%, rgba(0,180,255,0.8) 100%);
  z-index: 20;
}

.dark-cover .dc-rings {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  z-index: 3; pointer-events: none;
}
.dc-ring {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  border-radius: 50%; border: 1px solid rgba(0,180,255,0.1);
}
.dc-r1 { width: 560px; height: 560px; }
.dc-r2 { width: 430px; height: 430px; border-color: rgba(0,180,255,0.08); }
.dc-r3 { width: 280px; height: 280px; border-color: rgba(0,180,255,0.12); }

.dark-cover .dc-header {
  position: relative; z-index: 10;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 48px 56px 0;
}
.dc-logo-area { display: flex; align-items: center; gap: 14px; }
.dc-logo-hex {
  width: 46px; height: 46px;
  background: linear-gradient(135deg, rgba(0,180,255,0.2), rgba(0,120,200,0.08));
  border: 2px solid rgba(0,180,255,0.25);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.dc-logo-hex svg { width: 26px; height: 26px; }
.dc-logo-cn { font-size: 12px; letter-spacing: 10px; color: rgba(180,220,255,0.45); font-weight: 400; }
.dc-logo-en {
  font-family: 'Inter', sans-serif;
  font-size: 22px; font-weight: 900; letter-spacing: 6px;
  color: #e0f0ff; text-transform: uppercase;
}
.dc-header-tag {
  font-size: 11px; color: rgba(180,220,255,0.5);
  letter-spacing: 4px; font-weight: 400;
  padding: 6px 16px;
  border: 1px solid rgba(0,180,255,0.2);
  border-radius: 2px;
  background: rgba(0,30,60,0.3);
}

.dc-hero {
  position: relative; z-index: 10;
  padding: 80px 56px 0;
}
.dc-hero-label {
  font-size: 13px; letter-spacing: 10px;
  color: rgba(0,200,255,0.65); font-weight: 500;
  margin-bottom: 24px;
}
.dc-hero-title {
  font-size: 64px; font-weight: 900; color: #ffffff;
  letter-spacing: 5px; line-height: 1.2; margin-bottom: 16px;
}
.dc-hero-title .cyan {
  background: linear-gradient(135deg, #00d4ff, #0088ff);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.dc-hero-desc {
  font-size: 20px; font-weight: 300; color: rgba(180,210,240,0.55);
  letter-spacing: 3px; margin-bottom: 40px; max-width: 580px;
}
.dc-hero-line {
  width: 80px; height: 2px;
  background: linear-gradient(90deg, rgba(0,200,255,0.7), rgba(0,180,255,0.2));
  margin-bottom: 40px;
}

.dc-core-cards {
  position: relative; z-index: 10;
  display: flex; gap: 20px; padding: 0 56px; margin-bottom: 32px;
}
.dc-core-card {
  flex: 1;
  background: rgba(0,40,80,0.25);
  border: 1px solid rgba(0,180,255,0.15);
  border-radius: 6px;
  padding: 24px 20px;
  backdrop-filter: blur(8px);
}
.dc-core-card .num {
  font-family: 'Inter', sans-serif;
  font-size: 28px; font-weight: 900;
  color: rgba(0,200,255,0.35);
  margin-bottom: 6px;
}
.dc-core-card .label {
  font-size: 15px; font-weight: 600; color: #d0e8ff;
  letter-spacing: 1px; margin-bottom: 4px;
}
.dc-core-card .desc {
  font-size: 12px; color: rgba(160,200,240,0.5);
  letter-spacing: 1px;
}

.dc-tech-section {
  position: relative; z-index: 10;
  padding: 0 56px; display: flex; gap: 32px;
}
.dc-tech-col {
  flex: 1;
  background: rgba(0,40,80,0.2);
  border: 1px solid rgba(0,180,255,0.1);
  border-radius: 6px;
  padding: 28px 24px;
  backdrop-filter: blur(6px);
}
.dc-tech-col-title {
  font-size: 13px; font-weight: 600; color: #d0e8ff;
  letter-spacing: 3px; margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(0,180,255,0.12);
  display: flex; align-items: center; gap: 10px;
}
.dc-tech-col-title .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: rgba(0,200,255,0.5);
}
.dc-tech-items { display: flex; flex-direction: column; gap: 14px; }
.dc-tech-item { display: flex; align-items: flex-start; gap: 10px; }
.dc-tech-item .icon-sq {
  width: 6px; height: 6px; border-radius: 1px;
  background: rgba(0,200,255,0.35);
  margin-top: 6px; flex-shrink: 0;
}
.dc-tech-item .tt { font-size: 14px; font-weight: 500; color: #d0e8ff; letter-spacing: 1px; }
.dc-tech-item .td { font-size: 11px; color: rgba(160,200,240,0.45); margin-top: 2px; }

.dc-footer {
  position: absolute; bottom: 0; left: 0; right: 0;
  z-index: 10; padding: 40px 56px 48px;
  display: flex; justify-content: space-between; align-items: flex-end;
}
.dc-footer::before {
  content: '';
  position: absolute; bottom: 100px; left: 56px; right: 56px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,180,255,0.2), transparent);
}
.dc-ff-left { font-size: 11px; color: rgba(160,200,240,0.35); letter-spacing: 2px; font-weight: 300; }
.dc-qr-block { display: flex; align-items: center; gap: 14px; }
.dc-qr-box {
  width: 68px; height: 68px;
  background: rgba(0,30,60,0.4);
  border: 1px solid rgba(0,180,255,0.2);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
}
.dc-qr-box img { width: 60px; height: 60px; }
.dc-qr-text { font-size: 10px; color: rgba(160,200,240,0.4); letter-spacing: 2px; font-weight: 300; }

/* ====== Page 2: Product Overview dark page ====== */
.ov-header {
  position: relative; z-index: 10;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 40px 56px 0;
}
.ov-title-block { text-align: left; }
.ov-title-line { font-size: 12px; letter-spacing: 6px; color: rgba(0,200,255,0.5); margin-bottom: 8px; }
.ov-title-main { font-size: 32px; font-weight: 900; color: #e0f0ff; letter-spacing: 3px; }
.ov-title-main .hl-cyan { color: #00d4ff; }
.ov-title-divider { width: 60px; height: 2px; background: linear-gradient(90deg, rgba(0,200,255,0.6), transparent); margin-top: 12px; }

.ov-cards-row {
  position: relative; z-index: 10;
  display: flex; gap: 14px; padding: 24px 56px 0;
}
.ov-card {
  flex: 1;
  background: rgba(0,40,80,0.3);
  border: 1px solid rgba(0,180,255,0.18);
  border-radius: 6px;
  padding: 18px 16px;
  backdrop-filter: blur(8px);
}
.ov-card .ov-num {
  font-family: 'Inter', sans-serif;
  font-size: 26px; font-weight: 900;
  color: rgba(0,200,255,0.35);
  margin-bottom: 4px;
}
.ov-card .ov-label {
  font-size: 14px; font-weight: 600; color: #d0e8ff;
  letter-spacing: 1px; margin-bottom: 3px;
}
.ov-card .ov-desc {
  font-size: 11px; color: rgba(160,200,240,0.5);
  letter-spacing: 1px;
}

.ov-body {
  position: relative; z-index: 10;
  padding: 24px 56px 0;
  display: flex; gap: 36px;
}
.ov-body-left { flex: 1.1; }
.ov-body-right { flex: 0.9; }

.ov-section-title {
  font-size: 13px; font-weight: 700; color: #d0e8ff;
  letter-spacing: 3px; padding-bottom: 10px; margin-bottom: 14px;
  border-bottom: 2px solid rgba(0,180,255,0.15);
}
.ov-intro {
  font-size: 12px; color: rgba(180,210,240,0.55);
  line-height: 1.9; letter-spacing: 1px; margin-bottom: 24px;
}
.ov-advantage-list { display: flex; flex-direction: column; gap: 10px; }
.ov-adv-item { display: flex; align-items: flex-start; gap: 10px; }
.ov-adv-bullet {
  width: 18px; height: 18px; flex-shrink: 0;
  background: linear-gradient(135deg, rgba(0,180,255,0.2), rgba(0,120,200,0.08));
  border: 1px solid rgba(0,180,255,0.2);
  border-radius: 3px;
  display: flex; align-items: center; justify-content: center;
  font-size: 9px; color: rgba(0,200,255,0.7); font-weight: 700;
  font-family: 'Inter', sans-serif; margin-top: 2px;
}
.ov-adv-text { font-size: 11.5px; color: rgba(180,210,240,0.55); letter-spacing: 1px; line-height: 1.6; }
.ov-adv-text strong { color: #d0e8ff; font-weight: 600; }

.ov-matrix {
  background: rgba(0,40,80,0.2);
  border: 1px solid rgba(0,180,255,0.1);
  border-radius: 6px; padding: 18px; margin-bottom: 20px;
  backdrop-filter: blur(6px);
}
.ov-matrix-title { font-size: 12px; font-weight: 600; color: #d0e8ff; letter-spacing: 2px; margin-bottom: 14px; padding-bottom: 8px; border-bottom: 1px solid rgba(0,180,255,0.1); }
.ov-mx-row { display: flex; align-items: center; justify-content: space-between; padding: 6px 0; }
.ov-mx-name { font-size: 13px; color: #d0e8ff; font-weight: 500; letter-spacing: 1px; }
.ov-mx-tag { font-size: 9px; color: rgba(160,200,240,0.5); padding: 2px 8px; background: rgba(0,60,120,0.2); border: 1px solid rgba(0,180,255,0.1); border-radius: 2px; letter-spacing: 1px; }

.ov-contact {
  background: rgba(0,40,80,0.2);
  border: 1px solid rgba(0,180,255,0.1);
  border-radius: 6px; padding: 18px;
  backdrop-filter: blur(6px);
}
.ov-contact-title { font-size: 12px; font-weight: 600; color: #d0e8ff; letter-spacing: 2px; margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid rgba(0,180,255,0.1); }
.ov-contact-row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: rgba(180,210,240,0.55); letter-spacing: 1px; margin-bottom: 8px; }
.ov-contact-icon {
  width: 24px; height: 24px;
  background: rgba(0,60,120,0.2);
  border: 1px solid rgba(0,180,255,0.1);
  border-radius: 3px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 10px; color: rgba(0,200,255,0.5);
}

.ov-footer {
  position: absolute; bottom: 0; left: 0; right: 0;
  z-index: 10; padding: 30px 56px 40px;
  text-align: center;
}
.ov-footer::before {
  content: ''; position: absolute; bottom: 80px; left: 56px; right: 56px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,180,255,0.15), transparent);
}
.ov-footer-text { font-size: 10px; color: rgba(160,200,240,0.3); letter-spacing: 2px; font-weight: 300; }

/* Back cover (P11) specific - company info only */
.bc-header {
  position: relative; z-index: 10;
  display: flex; align-items: center; gap: 14px;
  padding: 48px 56px 0;
}
.bc-logo-hex {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, rgba(0,180,255,0.2), rgba(0,120,200,0.08));
  border: 2px solid rgba(0,180,255,0.25);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.bc-logo-hex svg { width: 24px; height: 24px; }
.bc-brand { font-family: 'Inter', sans-serif; font-size: 20px; font-weight: 900; letter-spacing: 6px; color: #e0f0ff; text-transform: uppercase; }
.bc-brand-cn { font-size: 11px; letter-spacing: 8px; color: rgba(180,220,255,0.4); font-weight: 400; }

.bc-body {
  position: absolute; bottom: 120px; left: 0; right: 0; z-index: 10;
  padding: 0 56px;
}
.bc-company-card {
  max-width: 560px; margin: 0 auto;
  background: rgba(0,40,80,0.2);
  border: 1px solid rgba(0,180,255,0.12);
  border-radius: 10px; padding: 40px; text-align: left;
  backdrop-filter: blur(6px);
}
.bc-company-name {
  font-size: 22px; font-weight: 700; color: #d0e8ff;
  letter-spacing: 3px; margin-bottom: 10px;
}
.bc-company-line {
  width: 40px; height: 1px; background: rgba(0,180,255,0.3);
  margin: 0 0 24px;
}
.bc-info-row { display: flex; align-items: center; justify-content: flex-start; gap: 10px; font-size: 13px; color: rgba(180,210,240,0.5); letter-spacing: 1px; margin-bottom: 12px; }
.bc-info-icon {
  width: 22px; height: 22px;
  background: rgba(0,60,120,0.2);
  border: 1px solid rgba(0,180,255,0.1);
  border-radius: 3px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 10px; color: rgba(0,200,255,0.5);
}

.bc-qr-area {
  margin-top: 32px;
  display: flex; align-items: center; justify-content: center; gap: 14px;
}
.bc-qr-box {
  width: 64px; height: 64px;
  background: rgba(0,30,60,0.4);
  border: 1px solid rgba(0,180,255,0.2);
  border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.bc-qr-box img { width: 56px; height: 56px; }
.bc-qr-text { font-size: 10px; color: rgba(160,200,240,0.4); letter-spacing: 2px; }

.bc-footer {
  position: absolute; bottom: 0; left: 0; right: 0;
  z-index: 10; padding: 36px 56px 44px;
  display: flex; justify-content: space-between; align-items: center;
}
.bc-footer::before {
  content: ''; position: absolute; bottom: 90px; left: 56px; right: 56px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,180,255,0.15), transparent);
}
.bc-f-left { font-size: 10px; color: rgba(160,200,240,0.3); letter-spacing: 2px; font-weight: 300; }
.bc-f-right { font-size: 10px; color: rgba(160,200,240,0.3); letter-spacing: 1px; font-weight: 300; }