/* ========================================
   Rosen Institute — Design Tokens & Base
   ======================================== */

/* 1. Custom Properties (Light Mode Default) */
:root {
  --bg: #F7F2F2;
  --bg-card: #ffffff;
  --border-card: #e5e5ea;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.04);
  --text-primary: #111111;
  --text-secondary: #666666;
  --accent: #FF5500;
  --bg-dark: #885053;
  --radius-button: 8px;
  --radius-card: 12px;
  --max-width: 1280px;
  --section-gap: 5rem;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --topology-url: url(topology-light.svg);
  --topology-cta-url: url(topology-cta.svg);
}

/* 2. Dark Mode Override */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --bg-card: #1a1a1f;
    --border-card: #2a2a2f;
    --shadow-card: none;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --topology-url: url(topology.svg);
    --bg-dark: #0a0a0a;
    --topology-cta-url: url(topology.svg);
  }
}

/* 3. Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-stack);
  line-height: 1.6;
}

/* 4. Typography */
.headline {
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.headline .accent {
  color: var(--accent);
}

.subtitle {
  color: var(--text-secondary);
  font-weight: 400;
}

.section-heading {
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

/* 5. Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.grid-2x2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* 6. Buttons */
.btn-primary {
  background: var(--accent);
  color: #ffffff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius-button);
  font-weight: 700;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  display: inline-block;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  transition: filter 0.15s ease;
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  padding: 0.75rem 2rem;
  border-radius: var(--radius-button);
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
  display: inline-block;
  text-decoration: none;
  font-family: inherit;
}

.btn-ghost:hover {
  border-color: #999999;
}

.btn-primary:focus-visible,
.btn-ghost:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* 7. Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.card-compact {
  padding: 1.25rem;
  font-size: 0.95rem;
}

/* 8. Testimonials */
.card .testimonial-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}


.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-author img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-author-info {
  display: flex;
  flex-direction: column;
}

.testimonial-author-name {
  font-weight: 700;
  font-size: 0.9rem;
}

.testimonial-author-role {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* 9. Feature Pills */
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* 10. CTA Banner */
.cta-banner {
  background: var(--bg-dark);
  color: #ffffff;
  text-align: center;
  padding: 4rem 1.5rem;
  background-image: var(--topology-cta-url);
}

/* 11. FAQ */
details.faq-item {
  border-bottom: 1px solid var(--border-card);
  padding: 1.25rem 0;
}

details.faq-item summary {
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

details.faq-item summary::-webkit-details-marker {
  display: none;
}

details.faq-item summary::after {
  content: "+";
  font-weight: 300;
  font-size: 1.5rem;
  color: var(--text-secondary);
  transition: transform 0.2s;
}

details.faq-item[open] summary::after {
  content: "\2212";
}

details.faq-item p {
  padding-top: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 12. Section Spacing */
section {
  padding: var(--section-gap) 0;
}

.section-dark {
  background: var(--bg-dark);
  color: #ffffff;
}

/* 13. Footer */
footer {
  background: var(--bg-dark);
  color: #ffffff;
  padding: 2rem;
  text-align: center;
  background-image: var(--topology-cta-url);
}

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

/* 14. Hero */
header {
  padding: 6rem 0 4rem;
  background-color: var(--bg);
  background-image: var(--topology-url);
}

.hero-content {
  max-width: 720px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.logo-mark {
  width: 32px;
  height: 32px;
}

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

header .headline {
  font-size: 2.25rem;
}

.hero-buttons {
  display: flex;
  gap: 0.75rem;
  margin: 2rem 0;
}

header .pills {
  margin-top: 1.5rem;
}

/* 15. Feature Icons */
.feature-icon {
  margin-bottom: 1rem;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--accent);
  fill: none;
  stroke-width: 2;
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
}

.card p {
  color: var(--text-secondary);
  margin: 0;
}

/* 16. Responsive */
@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }

  .grid-2x2 {
    grid-template-columns: 1fr 1fr;
  }

  header {
    padding: 8rem 0 6rem;
  }

  header .headline {
    font-size: 3.5rem;
  }

  .cta-banner,
  footer {
    background-attachment: fixed;
  }
}