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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2129;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --accent-glow: rgba(88, 166, 255, 0.15);
  --border: #30363d;
  --warning: #d29922;
  --code-bg: #0d1117;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --max-width: 1080px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--accent-hover);
}

code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === Nav === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.15s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* === Hero === */
.hero {
  padding: 140px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 36px;
}

/* === Buttons === */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  border: none;
  text-align: center;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  color: var(--bg-primary);
  box-shadow: 0 0 20px var(--accent-glow);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* === Sections === */
.section {
  padding: 80px 0;
}

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

.section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-lead {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 600px;
}

.section-note {
  margin-top: 32px;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* === Problem Grid === */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 8px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.problem-icon {
  color: var(--warning);
  font-size: 1.3rem;
  flex-shrink: 0;
  line-height: 1.5;
}

.problem-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* === About === */
#about p {
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 16px;
}

/* === Product Card === */
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 36px;
}

.product-header {
  margin-bottom: 28px;
}

.product-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.product-header p {
  color: var(--text-secondary);
}

.version-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--accent-glow);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 12px;
  vertical-align: middle;
  margin-left: 8px;
}

.product-checks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 28px;
}

.check-group h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.check-group ul {
  list-style: none;
  padding: 0;
}

.check-group li {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding: 4px 0;
  padding-left: 18px;
  position: relative;
}

.check-group li::before {
  content: ">";
  font-family: var(--font-mono);
  color: var(--accent);
  position: absolute;
  left: 0;
}

.code-block {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 16px;
}

.code-block code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.product-links {
  display: flex;
  gap: 12px;
}

/* === Pipeline === */
.pipeline {
  display: flex;
  align-items: flex-start;
  gap: 0;
  justify-content: center;
}

.pipeline-step {
  flex: 1;
  max-width: 280px;
  text-align: center;
  padding: 0 16px;
}

.pipeline-arrow {
  color: var(--text-muted);
  font-size: 1.8rem;
  padding-top: 30px;
  flex-shrink: 0;
}

.step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-glow);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 1rem;
}

.pipeline-step h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

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

/* === Roadmap === */
.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.roadmap-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.roadmap-item h4 {
  font-size: 1rem;
  margin-bottom: 8px;
}

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

/* === Waitlist === */
.waitlist-container {
  text-align: center;
  max-width: 520px;
}

.waitlist-form {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.waitlist-form input[type="email"] {
  flex: 1;
  padding: 12px 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.15s;
}

.waitlist-form input[type="email"]:focus {
  border-color: var(--accent);
}

.waitlist-form input[type="email"]::placeholder {
  color: var(--text-muted);
}

.form-note {
  margin-top: 14px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

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

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

/* === Responsive === */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .nav-links {
    display: none;
  }

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

  .product-checks {
    grid-template-columns: 1fr;
  }

  .pipeline {
    flex-direction: column;
    align-items: center;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
    padding-top: 0;
    padding: 8px 0;
  }

  .pipeline-step {
    max-width: 100%;
  }

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

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

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}