*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-primary: #1a56db;
  --color-primary-dark: #1240a8;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-light: #f9fafb;
  --color-border: #e5e7eb;
  --color-accent: #059669;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
}

/* Hero */
.hero {
  text-align: center;
  padding: 5rem 1.5rem 3rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.tagline {
  font-size: 1.25rem;
  color: var(--color-text-light);
}

/* Features */
.features {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.features h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.features ul {
  list-style: none;
  display: grid;
  gap: 1rem;
}

.features li {
  padding: 1rem 1.25rem;
  background: var(--color-bg-light);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.features li strong {
  color: var(--color-primary);
}

/* Coming Soon */
.coming-soon {
  text-align: center;
  padding: 3rem 1.5rem;
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.coming-soon p {
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.github-link {
  display: inline-block;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.github-link:hover {
  text-decoration: underline;
}

/* Roadmap */
.roadmap {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.roadmap h2 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

.roadmap-list {
  list-style: none;
  position: relative;
  padding-left: 2rem;
}

.roadmap-list::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--color-border);
}

.roadmap-item {
  position: relative;
  padding: 0.75rem 0 1.5rem 1.5rem;
}

.roadmap-item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 1rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  border: 2px solid var(--color-bg);
}

.roadmap-item.current::before {
  background: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.2);
}

.roadmap-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.roadmap-item.current .roadmap-label {
  color: var(--color-primary);
}

.roadmap-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.roadmap-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-border);
}

/* Responsive */
@media (max-width: 640px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .tagline {
    font-size: 1rem;
  }

  .hero {
    padding: 3rem 1.5rem 2rem;
  }
}