/* Reset and base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.6;
  color: #2d2d2d;
  background: #fafafa;
}

/* Vanderbilt Colors */
:root {
  --vu-black: #1C1C1C;
  --vu-gold: #CFAE70;
  --vu-gold-dark: #B49248;
  --vu-gold-light: #E8D5A3;
  --vu-charcoal: #333333;
  --vu-gray: #5A5A5A;
  --vu-light-bg: #F9F6F0;
  --vu-white: #FFFFFF;
}

/* Navbar */
.navbar {
  background: var(--vu-black);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  color: var(--vu-gold);
  font-weight: 700;
  font-size: 1.2rem;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: #ccc;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--vu-gold);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--vu-black) 0%, var(--vu-charcoal) 100%);
  color: #fff;
  padding: 6rem 2rem;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 800;
  color: var(--vu-gold);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: #ccc;
  margin-bottom: 2rem;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.badge {
  background: rgba(207, 174, 112, 0.15);
  border: 1px solid var(--vu-gold-dark);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--vu-gold-light);
}

/* Sections */
.section {
  padding: 5rem 2rem;
}

.section-alt {
  background: var(--vu-light-bg);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--vu-black);
}

.section > .container > p {
  font-size: 1.1rem;
  color: var(--vu-gray);
  margin-bottom: 2rem;
  max-width: 800px;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.feature-card {
  background: var(--vu-white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border-top: 3px solid var(--vu-gold);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--vu-black);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--vu-gray);
}

/* Architecture Diagram */
.architecture-diagram {
  margin: 2rem 0;
}

.arch-step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  background: var(--vu-white);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.arch-number {
  background: var(--vu-gold);
  color: var(--vu-black);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.arch-content h4 {
  font-size: 1.1rem;
  color: var(--vu-black);
  margin-bottom: 0.25rem;
}

.arch-tech {
  font-size: 0.8rem;
  color: var(--vu-gold-dark);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.arch-content p:last-child {
  color: var(--vu-gray);
  font-size: 0.9rem;
}

.arch-arrow {
  text-align: center;
  font-size: 1.5rem;
  color: var(--vu-gold-dark);
  padding: 0.5rem 0;
}

/* Resource Grid */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.resource-card {
  background: var(--vu-white);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border-left: 3px solid var(--vu-gold);
}

.resource-card h4 {
  color: var(--vu-charcoal);
  margin-bottom: 0.5rem;
}

.resource-card p {
  font-size: 0.9rem;
  color: var(--vu-gray);
}

/* Algorithm Section */
.algo-section {
  margin-bottom: 2.5rem;
}

.algo-section h3 {
  font-size: 1.3rem;
  color: var(--vu-charcoal);
  margin-bottom: 0.75rem;
}

.algo-section p {
  color: var(--vu-gray);
  margin-bottom: 1rem;
}

.code-block {
  background: var(--vu-black);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1rem 0;
  border-left: 4px solid var(--vu-gold);
}

.code-block pre {
  margin: 0;
}

.code-block code {
  color: #e2e8f0;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.8;
}

.design-list {
  list-style: none;
  padding: 0;
}

.design-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #e2e2e2;
  color: var(--vu-gray);
}

.design-list li:last-child {
  border-bottom: none;
}

.design-list strong {
  color: var(--vu-charcoal);
}

/* Frontend Section */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2.5rem;
}

.stack-item {
  background: var(--vu-white);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.page-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0 2.5rem;
}

.page-card {
  background: var(--vu-white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border-top: 3px solid var(--vu-gold);
}

.page-card h4 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--vu-black);
}

.page-card p {
  font-size: 0.9rem;
  color: var(--vu-gray);
}

/* Segment Types */
.segment-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 2.5rem;
}

.segment-type {
  background: var(--vu-white);
  border-left: 4px solid;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.seg-label {
  font-weight: 700;
  margin-right: 0.5rem;
}

/* Data Flow */
.flow-diagram {
  margin: 2rem 0;
}

.flow-step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  border-bottom: 1px solid #e2e2e2;
}

.flow-step:last-child {
  border-bottom: none;
}

.flow-icon {
  font-size: 2rem;
  flex-shrink: 0;
  width: 48px;
  text-align: center;
}

.flow-text h4 {
  font-size: 1rem;
  color: var(--vu-black);
  margin-bottom: 0.25rem;
}

.flow-text p {
  font-size: 0.9rem;
  color: var(--vu-gray);
}

.flow-text code {
  background: var(--vu-light-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-size: 0.85rem;
  color: var(--vu-charcoal);
}

/* Connection Diagram */
.connection-diagram {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin: 1.5rem 0 2.5rem;
  flex-wrap: wrap;
}

.conn-box {
  flex: 1;
  min-width: 250px;
  background: var(--vu-white);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border-top: 4px solid;
}

.conn-source {
  border-top-color: var(--vu-gold);
}

.conn-consumer {
  border-top-color: var(--vu-gold-dark);
}

.conn-box h4 {
  color: var(--vu-black);
  margin-bottom: 0.5rem;
}

.conn-box p {
  font-size: 0.9rem;
  color: var(--vu-gray);
  margin-bottom: 0.25rem;
}

.conn-detail {
  font-size: 0.8rem !important;
  color: #999 !important;
  font-style: italic;
}

.conn-arrow {
  font-size: 2rem;
  color: var(--vu-gold-dark);
  font-weight: 700;
}

.pipeline-overview {
  margin-bottom: 2.5rem;
}

/* Footer */
.footer {
  background: var(--vu-black);
  color: #999;
  padding: 3rem 2rem;
  text-align: center;
}

.footer p {
  margin-bottom: 0.5rem;
}

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

.footer-links a:hover {
  color: var(--vu-gold-light);
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .nav-links {
    display: none;
  }

  .arch-step {
    flex-direction: column;
    gap: 0.75rem;
  }

  .section {
    padding: 3rem 1.5rem;
  }

  .feature-grid,
  .resource-grid,
  .stack-grid,
  .page-cards {
    grid-template-columns: 1fr;
  }
}