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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: #24292f;
  background: #f6f8fa;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: #0969da;
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: #0550ae;
}

/* ===== Hero Header ===== */
.hero {
  position: relative;
  text-align: center;
  padding: 80px 24px 48px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(102, 126, 234, 0.12), transparent),
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(118, 75, 162, 0.06), transparent);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: clamp(2em, 5vw, 2.8em);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  color: #24292f;
}

.gradient-text {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1em;
  color: #57606a;
  margin-bottom: 32px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== Buttons ===== */
.header-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95em;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

.btn-github {
  background: #24292f;
  color: #fff;
}

.btn-github:hover {
  color: #fff;
  background: #32383f;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(36, 41, 47, 0.25);
}

.btn-github svg {
  fill: #fff;
}

.btn-maven {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
}

.btn-maven:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.35);
}

.btn-maven svg {
  fill: #fff;
}

/* ===== Alert Boxes ===== */
.alert {
  padding: 16px 20px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.95em;
  line-height: 1.6;
  border: 1px solid;
}

.alert-warning {
  background: #fff8c5;
  border-color: #d4a72c;
  color: #6a5300;
}

.alert-info {
  background: rgba(102, 126, 234, 0.06);
  border-color: rgba(102, 126, 234, 0.2);
  color: #4a5067;
}

/* ===== Section ===== */
.section {
  padding: 0 0 48px;
}

.section-title {
  font-size: 1.4em;
  font-weight: 700;
  color: #24292f;
  margin-bottom: 20px;
}

/* ===== Version List ===== */
.version-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.version-list li {
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 10px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s;
}

.version-list li:hover {
  border-color: #0969da;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

.version-list li.latest-version {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.04), rgba(118, 75, 162, 0.04));
  border-color: #667eea;
}

.version-list li.latest-version:hover {
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.15);
}

.version-name {
  color: #24292f;
  font-size: 1.05em;
  font-weight: 700;
}

.version-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.doc-link {
  font-size: 0.85em;
  font-weight: 500;
  color: #0969da;
}

.doc-link:hover {
  color: #0550ae;
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.75em;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge.latest {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
}

.badge.snapshot {
  background: rgba(212, 167, 44, 0.12);
  border: 1px solid rgba(212, 167, 44, 0.3);
  color: #7a5c00;
}

/* ===== Collapsible ===== */
.collapsible {
  margin-top: 8px;
}

.collapsible-toggle {
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 10px;
  padding: 14px 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 0.95em;
  font-weight: 600;
  color: #57606a;
  transition: all 0.2s;
}

.collapsible-toggle:hover {
  border-color: #0969da;
  color: #24292f;
}

.collapsible-toggle::after {
  content: '▶';
  font-size: 0.7em;
  transition: transform 0.2s;
  color: #8b949e;
}

.collapsible-toggle.open::after {
  transform: rotate(90deg);
}

.collapsible-content {
  display: none;
  padding-top: 10px;
}

.collapsible-content.open {
  display: block;
}

/* ===== Older Releases List ===== */
.older-list {
  list-style: none;
  padding: 8px 0 0;
}

.older-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  border-bottom: 1px solid #eaeef2;
  font-size: 0.9em;
}

.older-list li:last-child {
  border-bottom: none;
}

.older-list > li > span:first-child {
  color: #24292f;
  font-weight: 500;
}

.older-links {
  display: flex;
  gap: 16px;
}

.release-link {
  font-size: 0.85em;
  font-weight: 500;
  color: #8b949e;
}

.release-link:hover {
  color: #0969da;
}

/* ===== Legend ===== */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin-top: 28px;
  padding: 16px;
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 10px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85em;
  color: #57606a;
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 4px;
}

.legend-color.latest {
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.legend-color.snapshot {
  background: rgba(212, 167, 44, 0.4);
  border: 1px solid rgba(212, 167, 44, 0.5);
}

/* ===== Footer ===== */
.footer {
  margin-top: 48px;
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid #d0d7de;
}

.footer-links {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  align-items: center;
}

.footer-links a {
  color: #57606a;
  font-size: 0.88em;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #0969da;
}

.footer-links .sep {
  color: #d0d7de;
}

.built-with {
  margin-top: 16px;
  font-size: 0.85em;
  color: #8b949e;
}

.built-with a {
  color: #57606a;
  font-weight: 600;
}

.built-with a:hover {
  color: #0969da;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero {
    padding: 60px 16px 36px;
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .version-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}