:root {
  /* Default: Light Mode */
  --bg-color: #ffffff;
  --text-main: #1f2328;
  --text-muted: #656d76;
  --card-bg: #f6f8fa;
  --border-color: #d0d7de;
  --accent-color: #0969da;
  --accent-hover: #0550ae;
  --btn-text: #ffffff;
}

[data-theme="dark"] {
  --bg-color: #0d1117;
  --text-main: #e6edf3;
  --text-muted: #808b96;
  --card-bg: #161b22;
  --border-color: #30363d;
  --accent-color: #2f81f7;
  --accent-hover: #58a6ff;
  --btn-text: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  margin: 0;
  padding: 0;
  line-height: 1.6;
  font-size: 16px;
  transition: background-color 0.2s, color 0.2s;
}

header {
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  position: sticky;
  top: 0;
  background-color: var(--bg-color);
  z-index: 100;
  transition: background-color 0.2s;
}

.nav-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.logo-text {
  display: flex;
  align-items: center;
}

.logo-gate {
  font-family: 'Boldonse', sans-serif;
  font-weight: 400;
  line-height: 1;
}

.logo-letics {
  color: var(--accent-color);
  font-family: 'Orbitron', sans-serif;
  font-weight: 900;
  letter-spacing: 1.5px;
  line-height: 1;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-main);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  background-color: var(--card-bg);
  transition: background-color 0.2s, border-color 0.2s;
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px 80px 20px;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 0;
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  margin: 0 0 16px 0;
  letter-spacing: -0.5px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero p {
  max-width: 640px;
  margin: 0 auto 32px auto;
  color: var(--text-muted);
  font-size: 18px;
  line-height: 1.5;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--accent-color);
  color: var(--btn-text);
  font-weight: 600;
  font-size: 15px;
  padding: 10px 24px;
  border-radius: 6px;
  text-decoration: none;
  transition: background-color 0.2s;
}

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

/* Document / Section Title */
h2 {
  font-size: 24px;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 20px;
}

/* Feature & Download Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 20px 0;
  flex-grow: 1;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-weight: 600;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  transition: background-color 0.2s, border-color 0.2s;
  margin-bottom: 8px;
}

.btn-secondary:hover {
  background-color: var(--card-bg);
  border-color: var(--text-muted);
}

.card-link {
  font-size: 13px;
  color: var(--accent-color);
  text-decoration: none;
}

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

/* Steps section */
.step {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.step-number {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-color);
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 4px 0;
}

.step-content p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
}

/* Document styling */
.doc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 32px;
}

.loader {
  text-align: center;
  color: var(--text-muted);
  padding: 20px 0;
}

#content h1 {
  font-size: 28px;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 12px;
}

#content h2 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
}

#content p, #content li {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 12px;
}

#content ul {
  padding-left: 20px;
  margin-bottom: 16px;
}

#content strong {
  color: var(--text-main);
}

#content code {
  font-family: monospace;
  background: var(--border-color);
  padding: 2px 4px;
  border-radius: 4px;
  font-size: 14px;
}

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

#content a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 48px 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
}

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

.copyright {
  color: var(--text-muted);
  font-size: 14px;
}

/* Platform Download Cards Header Layout */
.card-header-layout {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.card-header-layout h3 {
  margin: 0 !important;
}

.card-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

/* Markdown styling inside release body */
#release-body h1, #release-body h2, #release-body h3, #release-body h4 {
  color: var(--accent-color);
  margin-top: 16px;
  margin-bottom: 8px;
}
#release-body ul, #release-body ol {
  padding-left: 20px;
  margin-top: 8px;
  margin-bottom: 8px;
}
#release-body li {
  margin-bottom: 4px;
}
#release-body code {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
}
#release-body a {
  color: var(--accent-color);
  text-decoration: underline;
}
#release-body a:hover {
  color: var(--accent-hover);
}