/* ===== CSS Variables ===== */
:root {
  --primary: #1a3a52;
  --secondary: #1dd3d3;
  --accent: #f59e0b;
  --background: #ffffff;
  --background-alt: #f8fafc;
  --text-dark: #1a2332;
  --text-light: #64748b;
  --text-white: #ffffff;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);

  --max-width: 1200px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--background);
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.25rem; }

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* ===== Utilities ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary);
  color: var(--text-white);
}

.btn-primary:hover {
  background: #244b6a;
}

.btn-secondary {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--primary);
  color: var(--text-white);
}

.btn-ghost {
  background: transparent;
  color: var(--text-light);
}

.btn-ghost:hover {
  color: var(--primary);
}

.btn-accent {
  background: var(--accent);
  color: var(--text-dark);
}

.btn-accent:hover {
  background: #d97706;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-links a:not(.btn) {
  color: var(--text-light);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:not(.btn):hover {
  color: var(--primary);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  transition: all 0.2s;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }
}

/* ===== Hero ===== */
.hero {
  padding: calc(72px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  background: linear-gradient(180deg, var(--background-alt) 0%, var(--background) 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
}

@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-ctas {
    justify-content: center;
  }
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--secondary);
  margin-bottom: var(--spacing-sm);
}

.hero h1 {
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.subheadline {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-lg);
  max-width: 540px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.social-proof {
  font-size: 0.875rem;
  color: var(--text-light);
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
}

.memo-preview {
  background: #1a2332;
  border-radius: var(--radius-lg);
  padding: 0;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.preview-header {
  display: flex;
  gap: 6px;
  padding: var(--spacing-sm);
  background: #0f1419;
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #3b4048;
}

.preview-dot:first-child { background: #ff5f56; }
.preview-dot:nth-child(2) { background: #ffbd2e; }
.preview-dot:nth-child(3) { background: #27ca40; }

.preview-content {
  padding: var(--spacing-md);
}

.preview-section {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: #8b949e;
  padding: 0.5rem 0;
  border-bottom: 1px solid #2d333b;
}

.preview-section:last-child {
  border-bottom: none;
}

/* ===== Problem Section ===== */
.problem {
  padding: var(--spacing-3xl) 0;
  background: var(--background-alt);
  text-align: center;
}

.problem h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-lg);
}

.problem-intro {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
}

.problem-list {
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
  text-align: left;
}

.problem-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
}

.problem-list li::before {
  content: "•";
  position: absolute;
  left: 0.5rem;
  color: var(--secondary);
  font-weight: bold;
}

.problem-conclusion {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--primary);
}

/* ===== How It Works ===== */
.how-it-works {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.how-it-works h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-2xl);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 768px) {
  .steps-grid {
    grid-template-columns: 1fr;
  }
}

.step {
  padding: var(--spacing-lg);
  background: var(--background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.step h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.step p {
  color: var(--text-light);
  font-size: 0.9375rem;
}

/* ===== Features ===== */
.features {
  padding: var(--spacing-3xl) 0;
  background: var(--background-alt);
  text-align: center;
}

.features h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-2xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

@media (max-width: 900px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  background: var(--background);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
}

.feature-card-large {
  grid-column: span 3;
}

@media (max-width: 900px) {
  .feature-card-large {
    grid-column: span 2;
  }
}

@media (max-width: 600px) {
  .feature-card-large {
    grid-column: span 1;
  }
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.9375rem;
}

.feature-details {
  margin-top: var(--spacing-md);
  padding-left: var(--spacing-md);
}

.feature-details li {
  color: var(--text-dark);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xs);
  position: relative;
}

.feature-details li::before {
  content: "→";
  position: absolute;
  left: -1.25rem;
  color: var(--secondary);
}

/* ===== Output Showcase ===== */
.output-showcase {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.output-showcase h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.showcase-subheadline {
  color: var(--text-light);
  margin-bottom: var(--spacing-2xl);
}

.showcase-visual {
  display: flex;
  justify-content: center;
}

.memo-mockup {
  background: #1a2332;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  width: 100%;
  max-width: 600px;
  text-align: left;
  box-shadow: var(--shadow-lg);
}

.mockup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid #2d333b;
  margin-bottom: var(--spacing-md);
}

.mockup-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  letter-spacing: 0.1em;
}

.mockup-meta {
  font-size: 0.75rem;
  color: #8b949e;
}

.mockup-toc {
  padding: var(--spacing-md);
  background: #0f1419;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.mockup-toc-title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #8b949e;
  margin-bottom: var(--spacing-xs);
}

.mockup-toc-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--secondary);
  padding: 0.25rem 0;
}

.mockup-content {
  position: relative;
}

.mockup-section-title {
  font-size: 1rem;
  font-weight: 600;
  color: #e6edf3;
  margin-bottom: var(--spacing-sm);
}

.mockup-text {
  font-size: 0.875rem;
  color: #8b949e;
  line-height: 1.6;
}

.mockup-text sup {
  color: var(--secondary);
  font-weight: 600;
}

.mockup-callout {
  position: absolute;
  right: -180px;
  top: 50%;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.callout-arrow {
  color: var(--accent);
  font-size: 1.25rem;
}

.callout-text {
  font-size: 0.75rem;
  color: var(--accent);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .mockup-callout {
    display: none;
  }
}

/* ===== Architecture ===== */
.architecture {
  padding: var(--spacing-3xl) 0;
  background: var(--background-alt);
  text-align: center;
}

.architecture h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.architecture-intro {
  color: var(--text-light);
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
}

.agent-flow {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
}

.agent {
  background: var(--primary);
  color: var(--text-white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
}

.agent-arrow {
  color: var(--secondary);
  font-size: 1.25rem;
  font-weight: 700;
}

@media (max-width: 600px) {
  .agent-arrow {
    display: none;
  }

  .agent-flow {
    flex-direction: column;
  }
}

/* ===== Pricing ===== */
.pricing {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.pricing h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-2xl);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto var(--spacing-lg);
}

@media (max-width: 768px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }
}

.pricing-card {
  background: var(--background);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: relative;
}

.pricing-card-featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: var(--text-white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
}

.pricing-card h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.price {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

.price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-light);
}

.pricing-features {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.pricing-features li {
  padding: var(--spacing-xs) 0;
  color: var(--text-light);
  font-size: 0.9375rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--secondary);
  margin-right: var(--spacing-xs);
  font-weight: 600;
}

.pricing-note {
  font-size: 0.875rem;
  color: var(--text-light);
}

/* ===== FAQ ===== */
.faq {
  padding: var(--spacing-3xl) 0;
  background: var(--background-alt);
}

.faq h2 {
  text-align: center;
  color: var(--primary);
  margin-bottom: var(--spacing-2xl);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  background: var(--background);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
}

.faq-item summary {
  padding: var(--spacing-md);
  cursor: pointer;
  font-weight: 500;
  color: var(--primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--secondary);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 var(--spacing-md) var(--spacing-md);
  color: var(--text-light);
}

/* ===== Final CTA ===== */
.final-cta {
  padding: var(--spacing-3xl) 0;
  background: linear-gradient(135deg, var(--primary) 0%, #244b6a 100%);
  text-align: center;
  color: var(--text-white);
}

.final-cta h2 {
  margin-bottom: var(--spacing-sm);
}

.final-cta p {
  opacity: 0.9;
  margin-bottom: var(--spacing-lg);
}

.cta-note {
  font-size: 0.875rem;
  opacity: 0.7;
  margin-top: var(--spacing-md);
}

/* ===== Footer ===== */
.footer {
  background: #0f1419;
  color: #8b949e;
  padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

.footer-brand .logo {
  color: var(--text-white);
  margin-bottom: var(--spacing-xs);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

@media (max-width: 600px) {
  .footer-links {
    grid-template-columns: 1fr;
  }
}

.footer-column h4 {
  color: var(--text-white);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.footer-column a {
  display: block;
  font-size: 0.875rem;
  padding: 0.25rem 0;
  transition: color 0.2s;
}

.footer-column a:hover {
  color: var(--text-white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid #2d333b;
  font-size: 0.875rem;
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social a:hover {
  color: var(--text-white);
}

@media (max-width: 600px) {
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
}