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

:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --text: #e8e8ed;
  --text-muted: #8a8a9a;
  --accent: #0CEFFF;
  --accent-glow: rgba(12, 239, 255, 0.15);
  --accent-glow-strong: rgba(12, 239, 255, 0.3);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
  --container: 1200px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity var(--transition);
}

a:hover {
  opacity: 0.85;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

/* === Container === */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Typography === */
h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: #fff;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: #fff;
}

h3 {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: #fff;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #0a0a0f;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  opacity: 1;
  box-shadow: 0 0 30px var(--accent-glow-strong);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-hover);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  opacity: 1;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 18px 36px;
  font-size: 1.05rem;
}

/* === Nav === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all 0.3s ease;
  background: transparent;
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo img {
  height: 32px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: #fff;
  opacity: 1;
}

.nav-links .btn {
  color: #0a0a0f;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* === Hero === */
.hero {
  padding: 160px 0 100px;
  text-align: center;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.badge {
  display: inline-flex;
  padding: 8px 18px;
  border-radius: 100px;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--accent);
  border: 1px solid rgba(12, 239, 255, 0.25);
  background: rgba(12, 239, 255, 0.06);
  margin-bottom: 28px;
  letter-spacing: 0.01em;
}

.hero-sub {
  max-width: 640px;
  margin: 20px auto 36px;
  color: var(--text-muted);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Sections === */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-elevated);
}

.section-label {
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-sub {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  max-width: 560px;
  margin-bottom: 48px;
}

/* center section-sub when used with centered headings */
#how-it-works .section-sub,
#modules .section-sub,
#pricing .section-sub,
#roi .section-sub {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

#how-it-works .section-label,
#modules .section-label,
#pricing .section-label,
#roi .section-label {
  text-align: center;
}

/* === Problem Cards === */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color var(--transition);
}

.card:hover {
  border-color: var(--border-hover);
}

.card-icon {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.card h3 {
  margin-bottom: 8px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* === Steps === */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.step {
  text-align: center;
  padding: 40px 28px;
}

.step-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 20px;
  opacity: 0.3;
}

.step h3 {
  margin-bottom: 12px;
}

.step p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* === Tabs & Modules === */
.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  justify-content: center;
  flex-wrap: wrap;
}

.tab {
  padding: 10px 22px;
  border-radius: 100px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.tab:hover {
  border-color: var(--border-hover);
  color: var(--text);
}

.tab.active {
  background: var(--accent);
  color: #0a0a0f;
  border-color: var(--accent);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 24px;
  transition: border-color var(--transition);
}

.module-card:hover {
  border-color: var(--border-hover);
}

.module-card h4 {
  margin-bottom: 8px;
}

.module-card p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* === Hardware === */
.hardware-title {
  margin-bottom: 8px;
}

.hardware-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin: 48px 0 32px;
}

.hw-spec {
  text-align: center;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.hw-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}

.hw-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.hardware-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.925rem;
  font-style: italic;
  max-width: 600px;
  margin: 0 auto;
}

/* === Pricing === */
.pricing-base {
  display: flex;
  justify-content: center;
  margin-bottom: 56px;
}

.pricing-base-card {
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
  text-align: center;
  max-width: 420px;
  width: 100%;
  position: relative;
  box-shadow: 0 0 40px var(--accent-glow);
}

.pricing-tag {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #0a0a0f;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-base-card h3 {
  margin-bottom: 8px;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 24px;
}

.pricing-base-card ul {
  text-align: left;
}

.pricing-base-card li {
  padding: 8px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.pricing-base-card li:last-child {
  border-bottom: none;
}

.pricing-base-card li::before {
  content: '✓ ';
  color: var(--accent);
  font-weight: 600;
}

.bundles-heading {
  text-align: center;
  margin-bottom: 28px;
  color: #fff;
}

.bundles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.bundle-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 28px 20px;
  text-align: center;
  transition: border-color var(--transition);
}

.bundle-card:hover {
  border-color: var(--border-hover);
}

.bundle-card h4 {
  margin-bottom: 8px;
  font-size: 0.9rem;
}

.bundle-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
}

.bundle-card-accent {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.pricing-note {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  max-width: 560px;
  margin: 0 auto;
}

/* === ROI === */
.roi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.roi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
}

.roi-card h4 {
  margin-bottom: 16px;
  font-size: 1rem;
}

.roi-cost {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.roi-timeline {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.roi-card-accent {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--accent-glow);
}

.roi-card-accent .roi-cost {
  color: var(--accent);
}

/* === Different === */
.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.diff-item {
  padding: 32px 24px;
}

.diff-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.diff-item h3 {
  margin-bottom: 8px;
}

.diff-item p {
  color: var(--text-muted);
  font-size: 0.925rem;
}

/* === FAQ === */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--accent);
}

.faq-icon {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding-bottom: 24px;
  color: var(--text-muted);
  font-size: 0.925rem;
  line-height: 1.7;
}

/* === CTA === */
.section-cta {
  text-align: center;
  padding: 120px 0;
  position: relative;
}

.section-cta::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.section-cta .container {
  position: relative;
  z-index: 1;
}

.section-cta h2 {
  margin-bottom: 16px;
}

.section-cta p {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  max-width: 480px;
  margin: 0 auto 32px;
}

.cta-email {
  margin-top: 20px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

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

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.8rem;
}

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

/* === Mobile === */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .hero {
    padding: 120px 0 80px;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .section {
    padding: 72px 0;
  }

  .pricing-base-card {
    padding: 32px 28px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .bundles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hardware-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}