/* Smart Digital Landing Page - Dark Theme */

:root {
  --sd-bg: #050711;
  --sd-bg-alt: #080a18;
  --sd-card: #101325;
  --sd-border: rgba(255, 255, 255, 0.08);
  --sd-primary: #3b82f6;
  --sd-primary-soft: rgba(59, 130, 246, 0.12);
  --sd-text: #f9fafb;
  --sd-muted: #9ca3af;
  --sd-accent: #22c55e;
  --sd-radius-lg: 18px;
  --sd-radius-xl: 26px;
  --sd-shadow-soft: 0 18px 60px rgba(0, 0, 0, 0.65);
  --sd-max-width: 1120px;
  --sd-font: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sd-font);
  background: radial-gradient(circle at top, #111827 0, #020617 55%, #000 100%);
  color: var(--sd-text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.sd-container {
  width: 100%;
  max-width: var(--sd-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */

.sd-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(3, 7, 18, 0.92), rgba(3, 7, 18, 0.72), transparent);
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.sd-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.sd-logo {
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 1.1rem;
}

.sd-logo span {
  color: var(--sd-primary);
}

.sd-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
}

.sd-nav a {
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  color: var(--sd-muted);
  border: 1px solid transparent;
  transition: all 0.18s ease-out;
}

.sd-nav a:hover {
  color: var(--sd-text);
  border-color: rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.9);
}

.sd-nav-cta {
  background: var(--sd-primary-soft);
  color: var(--sd-text);
  border-color: rgba(59, 130, 246, 0.9);
}

/* Hero */

.sd-hero {
  padding: 4.5rem 0 3.5rem;
}

.sd-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 2.5rem;
  align-items: stretch;
}

.sd-hero-copy h1 {
  font-size: clamp(2.2rem, 3vw + 1rem, 3.1rem);
  line-height: 1.12;
  margin-bottom: 1.1rem;
}

.sd-hero-sub {
  color: var(--sd-muted);
  max-width: 34rem;
  font-size: 0.98rem;
}

.sd-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.4);
  color: var(--sd-muted);
  margin-bottom: 1rem;
}

.sd-hero-actions {
  margin: 1.7rem 0 1.4rem;
}

.sd-hero-guarantee {
  font-size: 0.82rem;
  color: var(--sd-muted);
  margin-top: 0.75rem;
}

.sd-hero-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
}

.sd-hero-list li::before {
  content: "•";
  color: var(--sd-accent);
  margin-right: 0.4rem;
}

/* Buttons */

.sd-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.8rem 1.9rem;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease-out;
  white-space: nowrap;
}

.sd-btn-primary {
  background: linear-gradient(to right, #2563eb, #3b82f6, #22c55e);
  box-shadow: 0 18px 40px rgba(37, 99, 235, 0.6);
  color: #f9fafb;
}

.sd-btn-primary:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
  box-shadow: 0 22px 55px rgba(37, 99, 235, 0.75);
}

.sd-btn-full {
  width: 100%;
  background: #111827;
  color: var(--sd-text);
  border-color: rgba(148, 163, 184, 0.6);
}

.sd-btn-full:hover {
  background: #020617;
}

.sd-btn-large {
  padding: 0.95rem 2.4rem;
  font-size: 1.02rem;
}

/* Hero card */

.sd-hero-card {
  display: flex;
}

.sd-hero-card-inner {
  background: radial-gradient(circle at top left, rgba(59, 130, 246, 0.16), transparent 55%),
              radial-gradient(circle at bottom right, rgba(34, 197, 94, 0.16), transparent 55%),
              #020617;
  border-radius: var(--sd-radius-xl);
  border: 1px solid rgba(148, 163, 184, 0.4);
  padding: 1.75rem 1.6rem;
  box-shadow: var(--sd-shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.sd-hero-card-inner h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.sd-hero-card-inner ul {
  list-style: none;
  padding-left: 0;
  margin: 0.2rem 0 0.8rem;
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
}

.sd-hero-card-inner li::before {
  content: "✓";
  color: var(--sd-accent);
  margin-right: 0.45rem;
}

.sd-hero-price {
  margin-top: 0.4rem;
  margin-bottom: 0.8rem;
}

.sd-price-main {
  display: block;
  font-weight: 600;
  font-size: 0.98rem;
}

.sd-price-note {
  display: block;
  font-size: 0.8rem;
  color: var(--sd-muted);
}

/* Sections */

.sd-section {
  padding: 3.5rem 0;
}

.sd-section-alt {
  background: radial-gradient(circle at top right, rgba(15, 23, 42, 0.8), #020617 55%, #000 100%);
}

.sd-section h2 {
  font-size: 1.7rem;
  margin-bottom: 1.4rem;
}

.sd-two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 2.2rem;
  align-items: start;
}

/* Cards & grids */

.sd-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.sd-card {
  background: rgba(15, 23, 42, 0.95);
  border-radius: var(--sd-radius-lg);
  border: 1px solid rgba(31, 41, 55, 0.9);
  padding: 1.4rem 1.3rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.55);
}

.sd-card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.03rem;
  color: var(--sd-text);
}

.sd-card-highlight {
  border-color: rgba(59, 130, 246, 0.7);
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.28), rgba(15, 23, 42, 0.96));
}

/* Highlight box */

.sd-highlight-box {
  background: linear-gradient(145deg, rgba(15, 23, 42, 0.96), rgba(0, 0, 0, 0.96));
  border: 1px solid rgba(148, 163, 184, 0.45);
  border-radius: var(--sd-radius-lg);
  padding: 1.4rem 1.5rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.7);
}

.sd-highlight-box span {
  color: #f97316;
}

/* Checklist */

.sd-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.6rem;
  font-size: 0.92rem;
  color: var(--sd-muted);
}

.sd-checklist li::before {
  content: "✔";
  color: var(--sd-accent);
  margin-right: 0.5rem;
}

/* Checkout */

.sd-checkout-box {
  max-width: 780px;
  text-align: center;
}

.sd-checkout-sub {
  color: var(--sd-muted);
  font-size: 0.95rem;
  max-width: 620px;
  margin: 0 auto 1.7rem;
}

.sd-checkout-details {
  border-radius: var(--sd-radius-xl);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.22), rgba(15, 23, 42, 0.98));
  padding: 1.8rem 1.6rem 1.9rem;
  box-shadow: var(--sd-shadow-soft);
}

.sd-checkout-details ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.4rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem 1.4rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
}

.sd-checkout-details li::before {
  content: "•";
  color: var(--sd-accent);
  margin-right: 0.35rem;
}

.sd-checkout-price-label {
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.sd-checkout-note {
  font-size: 0.82rem;
  color: var(--sd-muted);
  margin-top: 0.8rem;
}

/* FAQ */

.sd-faq {
  display: grid;
  gap: 1rem;
}

.sd-faq-item {
  border-radius: 14px;
  border: 1px solid rgba(31, 41, 55, 0.9);
  background: rgba(15, 23, 42, 0.9);
  padding: 1rem 1.1rem;
  font-size: 0.9rem;
  color: var(--sd-muted);
}

.sd-faq-item h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 0.98rem;
  color: var(--sd-text);
}

/* Footer */

.sd-footer {
  border-top: 1px solid rgba(31, 41, 55, 0.95);
  padding: 1.6rem 0 2rem;
  background: #020617;
}

.sd-footer-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
  font-size: 0.8rem;
  color: var(--sd-muted);
}

.sd-footer-text a {
  color: var(--sd-primary);
}

/* Responsive */

@media (max-width: 900px) {
  .sd-hero-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .sd-two-col {
    grid-template-columns: minmax(0, 1fr);
  }

  .sd-grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sd-header-inner {
    gap: 0.8rem;
  }

  .sd-nav {
    display: none; /* keep header clean on very small widths; you can add mobile nav later if needed */
  }

  .sd-hero {
    padding-top: 3.5rem;
  }
}

@media (max-width: 640px) {
  .sd-grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .sd-container {
    padding: 0 1.25rem;
  }

  .sd-hero-copy h1 {
    font-size: 2rem;
  }

  .sd-header-inner {
    padding-inline: 1.25rem;
  }

  .sd-checkout-details {
    padding-inline: 1.2rem;
  }
}