/* =======================
   RESET & BASE
   ======================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:      #0A1628;
  --navy-mid:  #0F2137;
  --cyan:      #00E5FF;
  --cyan-dim:  rgba(0, 229, 255, 0.12);
  --white:     #FFFFFF;
  --off-white: #F0F4F8;
  --gray-mid:  #94A3B8;
  --gray-dark: #4A5568;

  --font-display: 'Syne', sans-serif;
  --font-body:    'DM Sans', sans-serif;

  --space-xs:  8px;
  --space-sm:  16px;
  --space-md:  32px;
  --space-lg:  64px;
  --space-xl:  96px;
  --space-2xl: 128px;

  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  40px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--navy);
  color: var(--white);
  line-height: 1.6;
}

/* =======================
   TYPOGRAPHY
   ======================= */
.section-eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--white);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 16px;
  color: var(--gray-mid);
  max-width: 480px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

/* =======================
   NAV
   ======================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 40px;
}

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

.nav-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--white);
}

.nav-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--gray-mid);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 100px;
  padding: 6px 14px;
}

.nav-pill-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

/* =======================
   HERO
   ======================= */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 100px 40px 80px;
}

.hero-bg-art {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.hero-orb-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,229,255,0.12) 0%, transparent 70%);
  top: -200px; right: -100px;
}

.hero-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,229,255,0.06) 0%, transparent 70%);
  bottom: -100px; left: 200px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 20%, transparent 80%);
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--gray-mid);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,229,255,0.2);
  border-radius: 100px;
  padding: 6px 14px;
  margin-bottom: 24px;
}

.hero-badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(60px, 8vw, 120px);
  font-weight: 800;
  line-height: 0.9;
  color: var(--white);
  margin-bottom: 24px;
}

.hero-headline-accent {
  color: var(--cyan);
  display: block;
}

.hero-sub {
  font-size: 18px;
  color: var(--gray-mid);
  max-width: 420px;
  line-height: 1.7;
  margin-bottom: 40px;
}

/* Product card mockup */
.hero-product-card {
  display: flex;
  align-items: center;
  gap: 24px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.hero-device {
  position: relative;
  width: 120px;
  flex-shrink: 0;
}

.device-body {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  height: 80px;
}

.device-neck {
  width: 40px; height: 28px;
  background: linear-gradient(135deg, #1a2d45, #0d1f35);
  border-radius: 12px;
  border: 1px solid rgba(0,229,255,0.3);
}

.device-vent {
  width: 28px; height: 36px;
  background: linear-gradient(135deg, #0d1f35, #061525);
  border-radius: 8px;
  border: 1px solid rgba(0,229,255,0.2);
  position: relative;
}

.device-vent::after {
  content: '';
  position: absolute;
  top: 8px; bottom: 8px;
  left: 6px; right: 6px;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,229,255,0.3) 0px,
    rgba(0,229,255,0.3) 2px,
    transparent 2px,
    transparent 6px
  );
  border-radius: 4px;
}

.device-glow {
  position: absolute;
  bottom: -10px; left: 50%; transform: translateX(-50%);
  width: 80px; height: 30px;
  background: radial-gradient(ellipse, rgba(0,229,255,0.25) 0%, transparent 70%);
  filter: blur(8px);
}

.device-specs {
  flex: 1;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 13px;
}

.spec-row:last-child { border-bottom: none; }

.spec-label { color: var(--gray-mid); }

.spec-value { color: var(--white); font-weight: 500; }

/* Hero right — stat stack */
.hero-stat-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.stat-block {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.stat-block-lg {
  padding: 28px 24px;
  border-bottom: 1px solid rgba(0,229,255,0.2);
  background: var(--cyan-dim);
}

.stat-block-highlight {
  padding: 20px 24px;
  border-bottom: none;
  background: rgba(255,255,255,0.04);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.stat-num {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.stat-unit {
  font-size: 20px;
  color: var(--gray-mid);
  font-weight: 400;
  margin-left: 4px;
}

.stat-divider {
  height: 1px;
  background: rgba(255,255,255,0.06);
}

.stat-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.stat-desc {
  display: block;
  font-size: 13px;
  color: var(--gray-mid);
}

.stat-best {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--navy);
  background: var(--cyan);
  border-radius: 4px;
  padding: 3px 8px;
  margin-top: 8px;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--gray-mid);
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* =======================
   PRICING
   ======================= */
.pricing {
  padding: var(--space-2xl) var(--space-md);
  background: var(--navy-mid);
}

.pricing-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.2s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
}

.pricing-card-featured {
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.05);
  position: relative;
}

.pricing-card-featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.pricing-card-header {
  margin-bottom: 20px;
}

.pricing-tier {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-mid);
  margin-bottom: 12px;
}

.pricing-card-featured .pricing-tier {
  color: var(--navy);
}

.pricing-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  background: rgba(10,22,40,0.15);
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 8px;
}

.pricing-amount {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 4px;
}

.pricing-price {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}

.pricing-card-featured .pricing-price {
  color: var(--navy);
}

.pricing-period {
  font-size: 16px;
  color: var(--gray-mid);
}

.pricing-card-featured .pricing-period {
  color: var(--navy-mid);
}

.pricing-per-unit {
  display: block;
  font-size: 13px;
  color: var(--gray-mid);
}

.pricing-card-featured .pricing-per-unit {
  color: var(--navy-mid);
}

.pricing-desc {
  font-size: 14px;
  color: var(--gray-mid);
  line-height: 1.6;
  margin-bottom: 20px;
}

.pricing-card-featured .pricing-desc {
  color: var(--navy-mid);
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pf-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--gray-mid);
}

.pricing-card-featured .pf-item {
  color: var(--navy-mid);
}

.pricing-note {
  text-align: center;
  font-size: 13px;
  color: var(--gray-dark);
  margin-top: 32px;
}

/* =======================
   FEATURES
   ======================= */
.features {
  padding: var(--space-2xl) var(--space-md);
  background: var(--navy);
}

.features-inner {
  max-width: 1100px;
  margin: 0 auto;
}

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

.feature-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: rgba(0,229,255,0.2);
}

.feature-icon {
  margin-bottom: 20px;
}

.feature-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 14px;
  color: var(--gray-mid);
  line-height: 1.7;
}

/* =======================
   HOW IT WORKS
   ======================= */
.how-it-works {
  padding: var(--space-2xl) var(--space-md);
  background: var(--navy-mid);
}

.hiw-inner {
  max-width: 900px;
  margin: 0 auto;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 80px 1fr 48px;
  align-items: center;
  gap: 32px;
  padding: 40px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.step-last {
  border-bottom: none;
}

.step-num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 800;
  color: rgba(0,229,255,0.2);
  line-height: 1;
}

.step-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
}

.step-desc {
  font-size: 15px;
  color: var(--gray-mid);
  line-height: 1.7;
}

.step-arrow {
  color: var(--cyan);
  opacity: 0.5;
}

/* =======================
   MANIFESTO
   ======================= */
.manifesto {
  padding: var(--space-2xl) var(--space-md);
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

.manifesto-bg {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(0,229,255,0.04) 0%, transparent 50%);
}

.manifesto-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.manifesto-content, .manifesto-solution {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.manifesto-eyebrow {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray-mid);
  margin-bottom: 4px;
}

.manifesto-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3.5vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  color: var(--white);
}

.manifesto-body {
  font-size: 16px;
  color: var(--gray-mid);
  line-height: 1.8;
  max-width: 640px;
}

/* =======================
   CLOSING
   ======================= */
.closing {
  padding: var(--space-2xl) var(--space-md);
  background: var(--navy);
  position: relative;
  text-align: center;
  overflow: hidden;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.closing-glow {
  position: absolute;
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(0,229,255,0.1) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 72px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 16px;
}

.closing-sub {
  font-size: 18px;
  color: var(--gray-mid);
  line-height: 1.7;
  margin-bottom: 48px;
}

.closing-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 48px;
}

.closing-price {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.closing-price-num {
  font-family: var(--font-display);
  font-size: 72px;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1;
}

.closing-price-period {
  font-size: 24px;
  color: var(--gray-mid);
}

.closing-price-note {
  font-size: 14px;
  color: var(--gray-mid);
}

.closing-tagline {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.3);
}

/* =======================
   FOOTER
   ======================= */
.footer {
  padding: 60px var(--space-md) 40px;
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--white);
}

.footer-tagline {
  font-size: 13px;
  color: var(--gray-dark);
}

.footer-links {
  display: flex;
  gap: 60px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col-head {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-dark);
  margin-bottom: 4px;
}

.footer-link {
  font-size: 14px;
  color: var(--gray-dark);
  text-decoration: none;
  transition: color 0.2s ease;
  cursor: pointer;
}

.footer-link:hover {
  color: var(--gray-mid);
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-copy {
  font-size: 12px;
  color: var(--gray-dark);
}

/* =======================
   RESPONSIVE
   ======================= */
@media (max-width: 768px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-right {
    order: -1;
  }

  .hero-headline {
    font-size: 56px;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .pricing-card-featured {
    transform: none;
  }

  .pricing-card-featured:hover {
    transform: translateY(-4px);
  }

  .features-grid {
    grid-template-columns: 1fr 1fr;
  }

  .step {
    grid-template-columns: 60px 1fr;
  }

  .step-arrow {
    display: none;
  }

  .footer-links {
    flex-direction: column;
    gap: 32px;
  }
}

/* =======================
   HERO CTA BUTTON
   ======================= */
.hero-cta {
  display: inline-block;
  margin-top: 24px;
  padding: 14px 28px;
  background: var(--cyan);
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: opacity 0.2s ease;
}

.hero-cta:hover {
  opacity: 0.85;
}

.hero-product-img {
  width: 120px;
  height: 120px;
  object-fit: cover;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

/* =======================
   PRICING — CROSSED-OUT & CTA
   ======================= */
.pricing-old-price {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-mid);
  text-decoration: line-through;
  margin-bottom: 4px;
}

.pricing-old-price-featured {
  color: rgba(10,22,40,0.5);
}

.pricing-launch-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--white);
  background: #e63946;
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 8px;
}

.pricing-launch-badge-featured {
  background: rgba(10,22,40,0.3);
  color: var(--navy);
}

.pricing-cta {
  display: block;
  text-align: center;
  margin-top: 20px;
  padding: 12px;
  background: var(--cyan);
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s ease;
}

.pricing-cta:hover {
  opacity: 0.85;
}

.pricing-cta-featured {
  background: var(--navy);
  color: var(--white);
}

/* =======================
   CLOSING CTA BUTTON
   ======================= */
.closing-cta-btn {
  display: inline-block;
  padding: 16px 40px;
  background: var(--cyan);
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  border-radius: var(--radius-md);
  margin-bottom: 32px;
  transition: opacity 0.2s ease;
}

.closing-cta-btn:hover {
  opacity: 0.85;
}

/* =======================
   CHECKOUT PAGE
   ======================= */
.checkout-page {
  min-height: 100vh;
  background: var(--navy);
  color: var(--white);
  font-family: var(--font-body);
  padding: 80px 24px 60px;
}

.checkout-inner {
  max-width: 640px;
  margin: 0 auto;
}

.checkout-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--gray-mid);
  text-decoration: none;
  margin-bottom: 40px;
  transition: color 0.2s ease;
}

.checkout-back-link:hover {
  color: var(--white);
}

.checkout-header {
  margin-bottom: 40px;
}

.checkout-logo {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.checkout-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.checkout-subtitle {
  font-size: 14px;
  color: var(--gray-mid);
}

.checkout-free-shipping {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #4ade80;
  background: rgba(74,222,128,0.1);
  border: 1px solid rgba(74,222,128,0.2);
  border-radius: 100px;
  padding: 6px 14px;
  margin-top: 12px;
}

.checkout-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

.checkout-form-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.checkout-form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.checkout-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checkout-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-mid);
}

.checkout-input {
  padding: 12px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 15px;
  transition: border-color 0.2s ease;
  outline: none;
  -webkit-appearance: none;
}

.checkout-input::placeholder {
  color: var(--gray-dark);
}

.checkout-input:focus {
  border-color: var(--cyan);
}

.checkout-input.error {
  border-color: #e63946;
}

.checkout-error-msg {
  font-size: 12px;
  color: #e63946;
  display: none;
}

.checkout-error-msg.show {
  display: block;
}

.checkout-submit-btn {
  width: 100%;
  padding: 16px;
  background: var(--cyan);
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.checkout-submit-btn:hover {
  opacity: 0.85;
}

.checkout-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Order summary sidebar */
.checkout-summary {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: 100px;
}

.checkout-summary-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-mid);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.checkout-product-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.checkout-product-name {
  font-size: 14px;
  color: var(--white);
  font-weight: 500;
}

.checkout-product-price {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.checkout-product-unit {
  font-size: 12px;
  color: var(--gray-mid);
  margin-top: 2px;
}

.checkout-summary-divider {
  height: 1px;
  background: rgba(255,255,255,0.06);
  margin: 16px 0;
}

.checkout-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.checkout-total-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-mid);
}

.checkout-total-amount {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  color: var(--cyan);
}

.checkout-shipping-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
  font-size: 13px;
  color: #4ade80;
}

.checkout-shipping-label {
  font-weight: 500;
}

.checkout-shipping-value {
  font-weight: 600;
}

.checkout-secure-note {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--gray-dark);
  margin-top: 16px;
}

/* Unit selector */
.checkout-unit-selector {
  background: var(--navy-mid);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
}

.checkout-unit-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-mid);
  margin-bottom: 12px;
}

.checkout-unit-options {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.checkout-unit-opt {
  padding: 12px 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.checkout-unit-opt:hover {
  border-color: rgba(0,229,255,0.3);
}

.checkout-unit-opt.selected {
  border-color: var(--cyan);
  background: var(--cyan-dim);
}

.checkout-unit-opt-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  display: block;
  margin-bottom: 4px;
}

.checkout-unit-opt-price {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  display: block;
}

.checkout-unit-opt-unit {
  font-size: 11px;
  color: var(--gray-mid);
  display: block;
  margin-top: 2px;
}

/* Success state */
.checkout-success {
  max-width: 540px;
  margin: 0 auto;
  text-align: center;
  padding: 60px 24px;
}

.checkout-success-icon {
  width: 72px;
  height: 72px;
  background: rgba(74,222,128,0.15);
  border: 2px solid #4ade80;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 32px;
}

.checkout-success-title {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 12px;
}

.checkout-success-sub {
  font-size: 16px;
  color: var(--gray-mid);
  line-height: 1.7;
  margin-bottom: 40px;
}

.checkout-success-order {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: left;
  margin-bottom: 32px;
}

.checkout-success-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 14px;
}

.checkout-success-row:last-child {
  border-bottom: none;
}

.checkout-success-row-label {
  color: var(--gray-mid);
}

.checkout-success-row-value {
  color: var(--white);
  font-weight: 500;
}

.checkout-success-back {
  display: inline-block;
  color: var(--cyan);
  font-size: 14px;
  text-decoration: none;
}

.checkout-success-back:hover {
  opacity: 0.75;
}

/* =======================
   RESPONSIVE
   ======================= */
@media (max-width: 480px) {
  .hero {
    padding: 80px 24px 60px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .pricing, .features, .how-it-works, .manifesto, .closing {
    padding: var(--space-xl) var(--space-md);
  }

  .checkout-layout {
    grid-template-columns: 1fr;
  }

  .checkout-summary {
    position: static;
  }

  .checkout-form-row {
    grid-template-columns: 1fr;
  }

  .checkout-unit-options {
    grid-template-columns: 1fr;
  }
}