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

/* Variables */
:root {
  --bg: #0e1117;
  --bg-raised: #161b22;
  --bg-surface: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-subtle: rgba(88, 166, 255, 0.1);
  --heading: #f0f6fc;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  --max-width: 860px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  color: var(--heading);
  text-decoration: none;
  letter-spacing: -0.01em;
  font-family: var(--font-mono);
}

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}

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

.nav-links a.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

/* Hero */
.hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--heading);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.hero .subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-subtle);
  border: 1px solid rgba(88, 166, 255, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-family: var(--font-mono);
}

/* Main content */
main {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  width: 100%;
}

/* Article / markdown content */
.content h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--heading);
  letter-spacing: -0.03em;
  margin: 3rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--heading);
  letter-spacing: -0.02em;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.375rem;
  border-bottom: 1px solid var(--border);
}

.content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--heading);
  margin: 2rem 0 0.5rem;
}

.content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.5rem 0 0.5rem;
}

.content p {
  margin: 0 0 1rem;
}

.content strong {
  color: var(--heading);
  font-weight: 600;
}

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

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

/* Lists */
.content ul,
.content ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.375rem;
}

.content li > ul,
.content li > ol {
  margin-top: 0.375rem;
  margin-bottom: 0;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.875rem;
}

.content thead th {
  text-align: left;
  padding: 0.625rem 0.75rem;
  border-bottom: 2px solid var(--border);
  color: var(--heading);
  font-weight: 600;
  white-space: nowrap;
}

.content tbody td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.content tbody tr:hover {
  background: var(--bg-raised);
}

/* Code */
.content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15em 0.35em;
}

.content pre {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
}

.content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Horizontal rules */
.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* Blockquotes */
.content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0 1.5rem;
  color: var(--text-muted);
  background: var(--bg-raised);
  border-radius: 0 6px 6px 0;
}

/* Content wrapper (positions copy button) */
.content-wrapper {
  position: relative;
}

/* Copy button — top right of content */
.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

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

/* Copy all button — nav bar */
.copy-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.25rem 0.625rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  margin-left: 0.25rem;
}

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

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
}

footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

/* Login */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  width: 100%;
  max-width: 300px;
  padding: 2rem;
}

.login-card form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.login-input {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: 0.625rem 0.875rem;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
}

.login-input:focus {
  border-color: var(--accent);
}

.login-input::placeholder {
  color: var(--text-muted);
}

.login-button {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.625rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity 0.15s;
}

.login-button:hover {
  opacity: 0.85;
}

.login-error {
  font-size: 0.8125rem;
  color: #f85149;
  text-align: center;
  margin: 0;
}

.login-rate-limit {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive */
@media (max-width: 640px) {
  .nav-inner {
    height: auto;
    flex-direction: column;
    padding: 0.75rem 1.5rem;
    gap: 0.5rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-links a {
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

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

  .content h1 {
    font-size: 1.625rem;
  }

  .content h2 {
    font-size: 1.3rem;
  }

  .content table {
    font-size: 0.8rem;
  }

  .content thead th,
  .content tbody td {
    padding: 0.375rem 0.5rem;
  }
}