/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-base);
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 1.75rem;
  height: 1.75rem;
  display: grid;
  place-items: center;
  background: var(--color-text);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.15rem 0.45rem;
  border: 1px solid var(--color-border);
}

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: 0.5rem 0.75rem;
  transition: color var(--duration-fast) var(--ease-out);
}

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

.site-nav a.nav-docs {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

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

.site-nav .nav-divider {
  width: 1px;
  height: 1.25rem;
  background: var(--color-border);
  margin-inline: 0.25rem;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

.nav-toggle span {
  display: block;
  width: 1rem;
  height: 1px;
  background: var(--color-text);
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav-toggle span::before {
  top: -4px;
}

.nav-toggle span::after {
  top: 4px;
}

.nav-toggle[aria-expanded="true"] span {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 0.75rem var(--content-inset) 1rem;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: none;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.625rem 0.75rem;
  }

  .site-nav .nav-divider {
    display: none;
  }

  .site-nav .btn {
    margin-top: 0.5rem;
    justify-content: center;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.625rem 1.125rem;
  border: 1px solid transparent;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

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

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

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

.btn-ghost {
  color: var(--color-text-muted);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--color-text);
  background: var(--color-bg-subtle);
}

.btn svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

/* Status dot */
.status-dot {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-status-green);
  box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.2);
}

/* Code block */
.code-block {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
}

.code-block pre {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text);
}

.code-block .comment {
  color: var(--color-text-faint);
}

.code-block .prompt {
  color: var(--color-accent);
  user-select: none;
}

/* Dark terminal code blocks */
.terminal-block {
  background: var(--color-terminal-bg);
  border: 1px solid var(--color-terminal-border);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  border-radius: 2px;
}

.terminal-block pre {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-terminal-text);
}

.terminal-block .comment {
  color: var(--color-terminal-comment);
}

.terminal-block .prompt {
  color: var(--color-terminal-prompt);
  user-select: none;
}

.terminal-block .command {
  color: var(--color-terminal-command);
}

.terminal-block .output {
  color: var(--color-terminal-output);
}

/* UI mockup — hero grok-web chat preview */
.ui-mockup {
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
  font-size: var(--text-xs);
}

.ui-mockup__chrome {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.875rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}

.ui-mockup__chrome-dots {
  display: flex;
  gap: 0.35rem;
}

.ui-mockup__chrome-dots span {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-border-strong);
}

.ui-mockup__chrome-dots span:nth-child(1) {
  background: #fca5a5;
}

.ui-mockup__chrome-dots span:nth-child(2) {
  background: #fcd34d;
}

.ui-mockup__chrome-dots span:nth-child(3) {
  background: #86efac;
}

.ui-mockup__chrome-title {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-faint);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ui-mockup__chrome-status {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-status-green);
}

.ui-mockup__body {
  display: flex;
  min-height: 16rem;
}

.ui-mockup__sidebar {
  width: 2.75rem;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.35rem;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}

.ui-mockup__sidebar-item {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 4px;
  background: var(--color-border);
}

.ui-mockup__sidebar-item.is-active {
  background: var(--color-accent-subtle);
  border: 1px solid var(--color-accent);
}

.ui-mockup__main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.ui-mockup__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.875rem;
  border-bottom: 1px solid var(--color-border);
}

.ui-mockup__header-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.ui-mockup__header-meta {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--color-text-faint);
}

.ui-mockup__messages {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.875rem;
  overflow: hidden;
}

.ui-mockup__message {
  display: flex;
  gap: 0.5rem;
  max-width: 92%;
}

.ui-mockup__message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.ui-mockup__message-avatar {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  border-radius: 3px;
  background: var(--color-border);
}

.ui-mockup__message--agent .ui-mockup__message-avatar {
  background: var(--color-text);
}

.ui-mockup__message--user .ui-mockup__message-avatar {
  background: var(--color-accent);
}

.ui-mockup__message-bubble {
  padding: 0.5rem 0.625rem;
  line-height: 1.5;
  color: var(--color-text-muted);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
}

.ui-mockup__message--user .ui-mockup__message-bubble {
  background: var(--color-accent-subtle);
  border-color: rgba(13, 148, 136, 0.2);
  color: var(--color-text);
}

.ui-mockup__message-bubble code {
  font-size: 0.65rem;
  background: rgba(15, 23, 42, 0.06);
}

.ui-mockup__message-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  margin-bottom: 0.2rem;
}

.ui-mockup__composer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 0.875rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.ui-mockup__composer-input {
  flex: 1;
  height: 1.75rem;
  padding: 0 0.625rem;
  font-size: 0.65rem;
  color: var(--color-text-faint);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 2px;
}

.ui-mockup__composer-btn {
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: var(--color-accent);
  color: #fff;
  border-radius: 2px;
}

.ui-mockup__composer-btn svg {
  width: 0.75rem;
  height: 0.75rem;
}

/* Feature icon */
.feature-icon {
  width: 2rem;
  height: 2rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  border: 1px solid rgba(13, 148, 136, 0.35);
  background: var(--color-accent-subtle);
}

.feature-icon svg {
  width: 1.125rem;
  height: 1.125rem;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Feature row */
.feature-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border);
}

.feature-row:last-child {
  border-bottom: 1px solid var(--color-border);
}

.feature-row__lead {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.feature-row__body {
  flex: 1;
  min-width: 0;
}

.feature-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  padding-top: 0.35rem;
  flex-shrink: 0;
  width: 5.5rem;
}

.feature-row h3 {
  margin-bottom: 0.35rem;
  color: var(--color-text);
}

.feature-row p {
  font-size: var(--text-sm);
}

.features-grid {
  margin-top: 2.5rem;
}

@media (min-width: 900px) {
  .features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 2.5rem;
  }

  .features-grid .feature-row {
    border-bottom: none;
  }

  .features-grid .feature-row:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--color-border);
  }
}

@media (max-width: 640px) {
  .feature-row {
    flex-direction: column;
    gap: 0.5rem;
  }

  .feature-tag {
    width: auto;
    padding-top: 0;
  }
}

/* Spec / compatibility tables */
.spec-table,
.compat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.spec-table th,
.spec-table td,
.compat-table th,
.compat-table td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.spec-table th,
.compat-table th {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  width: 30%;
  background: var(--color-bg-subtle);
}

.spec-table td,
.compat-table td {
  color: var(--color-text-muted);
}

.spec-table code,
.compat-table code {
  font-size: var(--text-xs);
}

.compat-table {
  border: 1px solid var(--color-border);
}

.compat-table thead th {
  border-bottom: 1px solid var(--color-border-strong);
}

.compat-table tbody tr:last-child td,
.compat-table tbody tr:last-child th {
  border-bottom: none;
}

.compat-table--zebra tbody tr:nth-child(even) td,
.compat-table--zebra tbody tr:nth-child(even) th {
  background: var(--color-bg-subtle);
}

.compat-table .compat-yes,
.compat-table .compat-partial {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
}

.compat-table .compat-yes {
  color: var(--color-status-green);
}

.compat-table .compat-partial {
  color: var(--color-status-amber);
}

/* Footer */
.footer-meta {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--duration-fast);
}

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