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

:root {
  --color-bg-dark: #0f1419;
  --color-bg-darker: #0a0e13;
  --color-bg-light: #f8f9fa;
  --color-bg-white: #ffffff;
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a4a6a;
  --color-text-light: #e0e0e8;
  --color-text-muted: #8a8aa0;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-light: rgba(59, 130, 246, 0.1);
  --color-border: #e2e4e8;
  --color-border-dark: #2a2f38;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container-max: 1120px;
  --section-padding: 6rem 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

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

/* === Navigation === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: background 0.3s, box-shadow 0.3s;
}

.nav.scrolled {
  background: rgba(15, 20, 25, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--color-border-dark);
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  transition: transform 0.3s, opacity 0.3s;
}

/* === Hero === */
.hero {
  background: var(--color-bg-dark);
  padding: 10rem 0 6rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 50% 0%, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
}

.hero-content {
  position: relative;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.hero-tagline {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 1.8rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-outline {
  border: 1.5px solid var(--color-border-dark);
  color: var(--color-text-light);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--color-text-muted);
  color: #fff;
}

.btn-sm {
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  border-radius: 6px;
  background: var(--color-accent);
  color: #fff !important;
}

.btn-sm:hover {
  background: var(--color-accent-hover);
}

/* === Sections === */
.section {
  padding: var(--section-padding);
}

.section-light {
  background: var(--color-bg-white);
}

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  text-align: center;
}

.section-dark .section-title {
  color: #fff;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.section-dark .section-subtitle {
  color: var(--color-text-muted);
}

/* === Stats Grid === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 3.5rem;
}

.stat-card {
  text-align: center;
  padding: 2rem 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-light);
}

.stat-number {
  display: block;
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.stat-label {
  display: block;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* === Problem Cards === */
.problem-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.problem-card {
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.problem-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.problem-card p {
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.problem-card em {
  color: var(--color-text-primary);
}

/* === Pipeline === */
.pipeline {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
}

.pipeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 32px;
  bottom: 32px;
  width: 2px;
  background: var(--color-border-dark);
}

.pipeline-step {
  display: flex;
  gap: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
}

.pipeline-step:last-child {
  margin-bottom: 0;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

.step-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.step-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.step-content p:last-child {
  color: var(--color-text-muted);
  font-size: 0.925rem;
}

/* === TLP Section === */
.tlp-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.tlp-explanation h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.tlp-explanation p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.tlp-benefits {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.tlp-benefit {
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-light);
}

.tlp-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.tlp-benefit h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.tlp-benefit p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* === Vision Grid === */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.vision-card {
  padding: 2.5rem 2rem;
  border-radius: 12px;
  border: 1px solid var(--color-border-dark);
  background: rgba(255, 255, 255, 0.03);
}

.vision-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.vision-card p {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* === Business Model === */
.model-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.model-text p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-table th,
.comparison-table td {
  padding: 0.85rem 1rem;
  text-align: left;
}

.comparison-table thead {
  background: var(--color-bg-dark);
  color: #fff;
}

.comparison-table th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.comparison-table tbody tr {
  border-bottom: 1px solid var(--color-border);
}

.comparison-table tbody tr:last-child {
  border-bottom: none;
}

.comparison-table td:first-child {
  font-weight: 600;
}

.comparison-table td {
  color: var(--color-text-secondary);
}

/* === CTA Section === */
.section-cta {
  background: var(--color-bg-darker);
  padding: 6rem 0;
  text-align: center;
}

.cta-content h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  color: #fff;
  max-width: 640px;
  margin: 0 auto 1rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.cta-content > p {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.cta-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0 auto 1rem;
}

.cta-form input {
  flex: 1;
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  border: 1.5px solid var(--color-border-dark);
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  font-size: 0.95rem;
  font-family: var(--font-family);
  outline: none;
  transition: border-color 0.2s;
}

.cta-form input::placeholder {
  color: var(--color-text-muted);
}

.cta-form input:focus {
  border-color: var(--color-accent);
}

.cta-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* === Footer === */
.footer {
  background: var(--color-bg-dark);
  border-top: 1px solid var(--color-border-dark);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
}

.footer-brand p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #fff;
}

/* === Responsive === */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .problem-details {
    grid-template-columns: 1fr;
  }

  .vision-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 4rem 0;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(15, 20, 25, 0.98);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav-links.open {
    display: flex;
  }

  .hero {
    padding: 8rem 0 4rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .tlp-grid,
  .model-content {
    grid-template-columns: 1fr;
  }

  .cta-form {
    flex-direction: column;
  }

  .footer-inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}