:root {
  --dd-bg: #f5f5f7;
  --dd-bg-alt: #ffffff;
  --dd-surface: #ffffff;
  --dd-border: rgba(0, 0, 0, 0.06);
  --dd-primary: #0071e3;
  --dd-primary-soft: rgba(0, 113, 227, 0.06);
  --dd-text: #111827;
  --dd-muted: #6b7280;
  --dd-radius-lg: 1.6rem;
  --dd-radius-md: 1.1rem;
  --dd-shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.08);
  --dd-max-width: 1120px;
  --dd-transition-fast: 0.18s ease-out;
}

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

html, body {
  margin: 0;
  padding: 0;
}

body.dd-body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #ffffff 0, #f5f5f7 55%, #f1f5f9 100%);
  color: var(--dd-text);
  min-height: 100vh;
}

/* Layout */

.dd-container {
  max-width: var(--dd-max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
}

.dd-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(248, 250, 252, 0.86);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.dd-header--subpage {
  background: rgba(248, 250, 252, 0.94);
}

.dd-header .dd-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.9rem;
}

.dd-logo {
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.dd-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.92rem;
}

.dd-nav a {
  color: var(--dd-muted);
  text-decoration: none;
  position: relative;
  padding-bottom: 0.15rem;
  transition: color var(--dd-transition-fast);
}

.dd-nav a::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.18rem;
  height: 2px;
  border-radius: 999px;
  transform: scaleX(0);
  transform-origin: center;
  background: var(--dd-primary);
  transition: transform var(--dd-transition-fast);
}

.dd-nav a:hover {
  color: var(--dd-text);
}

.dd-nav a:hover::after {
  transform: scaleX(1);
}

.dd-main {
  padding-top: 0.4rem;
}

/* Hero */

.dd-hero {
  padding: 3.2rem 0 2.4rem;
}

.dd-hero--small {
  padding: 2.6rem 0 1.8rem;
}

.dd-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.dd-hero h1 {
  font-size: clamp(2.2rem, 3vw, 2.8rem);
  letter-spacing: -0.04em;
  margin: 0 0 0.6rem;
}

.dd-lead {
  max-width: 40rem;
  color: var(--dd-muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* Sections */

.dd-section {
  padding: 1.6rem 0;
}

.dd-section--alt {
  background: radial-gradient(circle at top, #ffffff 0, #f9fafb 60%, #f3f4f6 100%);
  border-block: 1px solid rgba(148, 163, 184, 0.16);
}

.dd-section--cta {
  text-align: center;
  padding-bottom: 2.6rem;
}

/* Grid */

.dd-grid {
  display: grid;
  gap: 1.8rem;
  align-items: flex-start;
}

.dd-grid--2 {
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
}

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

@media (max-width: 900px) {
  .dd-grid--2,
  .dd-grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Cards & placeholders */

.dd-card {
  background: var(--dd-surface);
  border-radius: var(--dd-radius-lg);
  border: 1px solid var(--dd-border);
  padding: 1.4rem 1.5rem 1.5rem;
  box-shadow: var(--dd-shadow-soft);
  position: relative;
  overflow: hidden;
}

.dd-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top, rgba(0, 113, 227, 0.06), transparent 60%);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dd-transition-fast);
}

.dd-card:hover::before {
  opacity: 1;
}

.dd-card h2,
.dd-card h3 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
}

.dd-card p {
  margin-top: 0;
  margin-bottom: 0.9rem;
  color: var(--dd-muted);
  font-size: 0.95rem;
}

.dd-placeholder {
  min-height: 220px;
  border-radius: var(--dd-radius-lg);
  border: 1px dashed rgba(148, 163, 184, 0.8);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.85), rgba(248, 250, 252, 1)),
    radial-gradient(circle at top left, rgba(0, 113, 227, 0.08), transparent 55%);
  box-shadow: var(--dd-shadow-soft);
}

/* Lists */

.dd-list {
  list-style: none;
  margin: 0.3rem 0 0;
  padding: 0;
  color: var(--dd-muted);
  font-size: 0.94rem;
}

.dd-list li {
  padding-left: 1.3rem;
  position: relative;
  margin-bottom: 0.35rem;
}

.dd-list li::before {
  content: "•";
  position: absolute;
  left: 0.3rem;
  color: var(--dd-primary);
}

.dd-list--ordered {
  list-style: decimal;
  padding-left: 1.4rem;
}

.dd-list--ordered li {
  padding-left: 0.2rem;
}

.dd-list--ordered li::before {
  content: none;
}

/* Buttons */

.dd-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.7rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--dd-transition-fast),
    border-color var(--dd-transition-fast),
    color var(--dd-transition-fast),
    transform var(--dd-transition-fast),
    box-shadow var(--dd-transition-fast);
}

.dd-button--primary {
  background: var(--dd-primary);
  color: #ffffff;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.18);
}

.dd-button--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.22);
}

.dd-button--outline {
  background: #ffffff;
  color: var(--dd-primary);
  border-color: rgba(148, 163, 184, 0.7);
}

.dd-button--outline:hover {
  background: var(--dd-primary-soft);
}

/* Footer */

.dd-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.3);
  margin-top: 1.8rem;
  background: #f9fafb;
}

.dd-footer .dd-container {
  padding-block: 1.1rem;
  text-align: center;
}

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