/* ===== Reset & Custom Properties ===== */

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

:root {
  --bg: #0d1117;
  --bg-terminal: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #7d8590;
  --accent: #95BF47;
  --accent-hover: #5E8E3E;
  --font: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --max-width: 680px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-2xl: 4rem;
}

/* ===== Base ===== */

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-weight: 400;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

code {
  font-family: var(--font);
  font-size: 0.8125rem;
}

h2 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* ===== Top Bar ===== */

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
}

.logo {
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.github-link {
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.github-link:hover {
  color: var(--text);
}

/* ===== Hero ===== */

.hero {
  max-width: var(--max-width);
  margin: var(--spacing-2xl) auto var(--spacing-xl);
  padding: 0 var(--spacing-lg);
  text-align: center;
}

.tagline {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.hero-sub {
  margin-top: var(--spacing-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== Terminal ===== */

.terminal {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-terminal);
}

.terminal-chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red { background: #ff5f57; }
.terminal-dot.yellow { background: #febc2e; }
.terminal-dot.green { background: #28c840; }

.terminal-title {
  margin-left: auto;
  margin-right: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.terminal-body {
  padding: var(--spacing-md) var(--spacing-lg);
  min-height: 180px;
  font-size: 0.8125rem;
  line-height: 1.7;
}

.terminal-body pre {
  font-family: var(--font);
  white-space: pre-wrap;
  word-break: break-word;
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

/* ===== Sections ===== */

.section {
  max-width: var(--max-width);
  margin: 0 auto var(--spacing-2xl);
  padding: 0 var(--spacing-lg);
}

.section-desc {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.section-desc a {
  font-weight: 500;
}

.section-desc code {
  color: var(--text);
  background: var(--bg-terminal);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ===== Code Blocks ===== */

.code-block {
  position: relative;
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--spacing-md) var(--spacing-lg);
  padding-right: 3rem;
  margin-bottom: var(--spacing-md);
  overflow-x: auto;
}

.code-block code {
  color: var(--text);
  font-size: 0.8125rem;
  word-break: break-all;
}

/* ===== Copy Button ===== */

.copy-btn {
  position: absolute;
  top: 50%;
  right: var(--spacing-sm);
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* ===== Alt Install ===== */

.alt-install {
  margin-top: var(--spacing-md);
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.alt-install code {
  color: var(--text);
  background: var(--bg-terminal);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ===== Agent Steps ===== */

.agent-steps {
  list-style: none;
  counter-reset: agent-step;
  padding: 0;
}

.agent-steps li {
  counter-increment: agent-step;
  position: relative;
  padding-left: 2rem;
  margin-bottom: var(--spacing-md);
  color: var(--text);
  font-size: 0.8125rem;
  line-height: 1.7;
}

.agent-steps li::before {
  content: counter(agent-step);
  position: absolute;
  left: 0;
  font-weight: 700;
  color: var(--accent);
  font-size: 0.8125rem;
}

.agent-steps code {
  color: var(--text);
  background: var(--bg-terminal);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ===== Command List ===== */

.command-list {
  margin: 0;
  padding: 0;
}

.command-list dt {
  font-weight: 700;
  font-size: 0.8125rem;
  margin-bottom: var(--spacing-xs);
}

.command-list dt code {
  color: var(--text);
  font-weight: 700;
}

.command-list dd {
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-left: 0;
  margin-bottom: var(--spacing-lg);
  padding-left: 0;
}

.command-list dd:last-child {
  margin-bottom: 0;
}

/* ===== Safety List ===== */

.safety-list {
  list-style: none;
  padding: 0;
}

.safety-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-muted);
  font-size: 0.8125rem;
  line-height: 1.7;
  border-left: 2px solid var(--border);
}

/* ===== Footer ===== */

.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-2xl);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--text-muted);
  font-weight: 500;
}

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

.sep {
  margin: 0 var(--spacing-sm);
  color: var(--border);
}

/* ===== Demo Terminal Override ===== */

#demo .terminal-body {
  min-height: 260px;
}

/* ===== Tabs ===== */

.tabs {
  display: grid;
  grid-template-columns: auto auto 1fr;
  grid-template-rows: auto 1fr;
}

.tab-radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.tab-label {
  grid-row: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
  user-select: none;
}

.tab-label:hover {
  color: var(--text);
}

.tab-radio:checked + .tab-label {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel {
  display: none;
  grid-column: 1 / -1;
  grid-row: 2;
  padding-top: var(--spacing-lg);
}

/* Show panel when its corresponding radio is checked */
#tab-human:checked ~ .panel-human {
  display: block;
}

#tab-agent:checked ~ .panel-agent {
  display: block;
}

/* ===== Animation ===== */

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* ===== Responsive ===== */

@media (max-width: 600px) {
  .hero {
    margin-top: var(--spacing-xl);
  }

  .terminal-body {
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 150px;
    font-size: 0.75rem;
  }

  .code-block {
    font-size: 0.75rem;
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 2.5rem;
  }

  .code-block code {
    font-size: 0.75rem;
  }

  h2 {
    font-size: 0.875rem;
  }

  .tagline {
    font-size: 1rem;
  }

  #demo .terminal-body {
    min-height: 220px;
  }

  .tab-label {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
  }
}