:root {
  --rf-bg: #050509;
  --rf-bg-alt: #111320;
  --rf-surface: #141828;
  --rf-border: #272c3f;
  --rf-accent: #4f8cff;
  --rf-accent-soft: rgba(79, 140, 255, 0.1);
  --rf-accent-strong: #3566d1;
  --rf-text: #f6f7ff;
  --rf-text-muted: #a3abc5;
  --rf-pill-bg: #20253b;
  --rf-radius-lg: 18px;
  --rf-radius-xl: 24px;
  --rf-shadow-soft: 0 22px 45px rgba(0, 0, 0, 0.45);
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    sans-serif;
  background: radial-gradient(circle at top left, #1b2041, #050509 50%);
  color: var(--rf-text);
  line-height: 1.6;
}

/* Layout helpers */

.rf-container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.rf-section {
  padding: 4rem 0;
}

.rf-section-alt {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.02),
    rgba(0, 0, 0, 0.72)
  );
}

.rf-grid-2 {
  display: grid;
  gap: 2rem;
}

@media (min-width: 768px) {
  .rf-grid-2 {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }
}

/* Header */

.rf-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(18px);
  background: linear-gradient(
    to bottom,
    rgba(5, 5, 12, 0.96),
    rgba(5, 5, 12, 0.65)
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.rf-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
}

.rf-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.rf-logo {
  height: 48px;
  width: auto;
  object-fit: contain;
  margin-right: 12px;
  background: transparent;
  padding: 0;
  border-radius: 0;
}

.rf-brand-text {
  display: flex;
  flex-direction: column;
}

.rf-brand-name {
  font-weight: 600;
  letter-spacing: 0.03em;
}

.rf-brand-tagline {
  font-size: 0.75rem;
  color: var(--rf-text-muted);
}

.rf-nav {
  display: none;
  gap: 1rem;
  font-size: 0.9rem;
}

.rf-nav a {
  color: var(--rf-text-muted);
  text-decoration: none;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
}

.rf-nav a:hover {
  color: var(--rf-text);
  background: rgba(255, 255, 255, 0.06);
}

.rf-nav-cta {
  border: 1px solid rgba(255, 255, 255, 0.16);
}

@media (min-width: 900px) {
  .rf-nav {
    display: flex;
  }
}

/* Hero */

.rf-hero {
  padding-top: 3.25rem;
}

.rf-hero-inner {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .rf-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

.rf-hero-text h1 {
  font-size: clamp(2.2rem, 3vw, 2.8rem);
  line-height: 1.1;
  margin-bottom: 1rem;
}

.rf-hero-text p {
  color: var(--rf-text-muted);
  max-width: 34rem;
}

.rf-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.rf-hero-meta {
  font-size: 0.85rem;
  color: var(--rf-text-muted);
}

/* Buttons */

.rf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.15rem;
  border-radius: 999px;
  font-size: 0.9rem;
  border: none;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

.rf-btn-primary {
  background: var(--rf-accent);
  color: #ffffff;
  box-shadow: 0 14px 35px rgba(79, 140, 255, 0.45);
}

.rf-btn-primary:hover {
  background: var(--rf-accent-strong);
}

.rf-btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--rf-text);
}

.rf-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
}

.rf-btn-full {
  width: 100%;
}

/* Hero side cards */

.rf-hero-panel {
  display: grid;
  gap: 1.25rem;
}

.rf-hero-card {
  background: radial-gradient(circle at top left, #26304f, #111320);
  border-radius: var(--rf-radius-xl);
  padding: 1.4rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.07);
  box-shadow: var(--rf-shadow-soft);
}

.rf-hero-card h2 {
  margin-top: 0;
  font-size: 1rem;
}

.rf-hero-card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--rf-text-muted);
}

.rf-hero-stats {
  background: linear-gradient(145deg, var(--rf-accent-soft), #10121c);
}

.rf-stat-row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.6rem;
}

.rf-stat-number {
  display: block;
  font-size: 1.25rem;
  font-weight: 600;
}

.rf-stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--rf-text-muted);
}

/* Section titles */

.rf-section-title {
  font-size: 1.7rem;
  margin-bottom: 0.5rem;
}

.rf-section-intro {
  max-width: 40rem;
  color: var(--rf-text-muted);
  margin-bottom: 2rem;
}

/* Theory section */

.rf-theory-points h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.rf-theory-points .rf-list li + li {
  margin-top: 0.6rem;
}

/* Cards / grid */

.rf-card-grid {
  display: grid;
  gap: 1.5rem;
}

.rf-card-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

@media (min-width: 900px) {
  .rf-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

.rf-card {
  background: rgba(13, 15, 27, 0.96);
  border-radius: var(--rf-radius-lg);
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--rf-border);
}

.rf-card h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
}

.rf-card p {
  margin-top: 0.4rem;
  color: var(--rf-text-muted);
}

.rf-tagline {
  font-size: 0.85rem;
  color: var(--rf-text-muted);
  margin-top: 0.8rem;
}

.rf-card-highlight {
  background: radial-gradient(circle at top left, var(--rf-accent-soft), #111320);
}

/* Lists */

.rf-list {
  margin-top: 0.7rem;
  padding-left: 1.1rem;
  color: var(--rf-text-muted);
}

/* Contact & form */

.rf-contact-list {
  list-style: none;
  padding-left: 0;
  margin: 1rem 0;
  color: var(--rf-text-muted);
}

.rf-contact-list li {
  margin-bottom: 0.35rem;
}

.rf-contact-note {
  font-size: 0.85rem;
  color: var(--rf-text-muted);
}

.rf-form {
  background: rgba(8, 9, 17, 0.95);
  border-radius: var(--rf-radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--rf-border);
}

.rf-form-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 0.9rem;
}

.rf-form-row label {
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.rf-form-row input,
.rf-form-row textarea {
  background: #05060b;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 0.55rem 0.65rem;
  color: var(--rf-text);
  font-family: inherit;
  font-size: 0.9rem;
}

.rf-form-row input:focus,
.rf-form-row textarea:focus {
  outline: none;
  border-color: var(--rf-accent);
  box-shadow: 0 0 0 1px rgba(79, 140, 255, 0.35);
}

.rf-form-footnote {
  font-size: 0.8rem;
  color: var(--rf-text-muted);
  margin-top: 0.5rem;
}

/* Footer */

.rf-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem 0 2rem;
  background: radial-gradient(circle at bottom, #15172a, #050509 60%);
}

.rf-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--rf-text-muted);
}

.rf-footer-brand {
  font-weight: 600;
  margin-right: 0.5rem;
}

.rf-footer-links a {
  color: var(--rf-text-muted);
  text-decoration: none;
}

.rf-footer-links a:hover {
  color: var(--rf-text);
}

/* Utilities */

@media (max-width: 768px) {
  .rf-section {
    padding: 3rem 0;
  }

  .rf-header-inner {
    padding-inline: 1rem;
  }
}

.rf-founder-photo {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1.25rem;
  border: 3px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.55);
}