:root {
  --bg: #f4fbfd;
  --surface: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: #9bbccf;

  --text: #121212;
  --text-muted: #55606e;
  --accent: #78a6c8;
  --accent-light: #e6f4fa;
  --link: #1f6fad;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --container: 760px;
}

html {
  scrollbar-gutter: stable;
  scroll-behavior: smooth;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2.5rem 1.5rem 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.8rem;
  letter-spacing: -0.02em;
}

.color-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s ease;
}

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

/* Hero */
.hero {
  padding: 4rem 0 3rem;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--link);
  border: 1px solid rgba(120, 166, 200, 0.35);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.lead {
  font-size: 1.18rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 2rem;
  max-width: 620px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

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

.btn-primary:hover {
  background: #252525;
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Section */
.section {
  padding: 3rem 0;
}

.section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.75rem;
  color: var(--text);
}

/* Grid & Feature Cards */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

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

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.4rem;
  margin-bottom: 0.6rem;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* Stack Section */
.stack-section {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.tech-list {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.tech-list span {
  color: var(--text);
  font-weight: 500;
}

/* Footer */
.footer {
  margin-top: auto;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

/* Download Box */
.download-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.download-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.download-meta {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.download-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.btn-large {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

/* Changelog Section */
.changelog-container {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.release-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem 1.75rem;
}

.release-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
}

.release-version {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.release-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.release-body h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.release-body h4:first-child {
  margin-top: 0;
}

.release-body ul {
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

@media (max-width: 600px) {
  .download-box {
    flex-direction: column;
    align-items: flex-start;
  }
}