/* ==========================================================================
   s0 shared component styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background var(--transition-norm), border-color var(--transition-norm);
}

.site-header-inner {
  max-width: var(--container-max);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.site-logo-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}

.site-logo-link:hover {
  text-decoration: none;
  color: var(--brand);
}

.header-logo,
.header-logo-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  object-fit: contain;
  flex-shrink: 0;
  display: block;
}

.site-logo-title {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.logo-name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.logo-sub {
  color: var(--text-tertiary);
  font-size: 13px;
  font-weight: 500;
}

.site-header-right,
.site-header-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Canonical Header Navigation Buttons */
.nav-btn {
  height: 32px;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  color: var(--text-secondary);
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.nav-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--surface-hover);
  text-decoration: none;
}

.nav-btn:focus-visible {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: var(--focus-ring);
}

.nav-btn.nav-btn-active,
.nav-btn[aria-current="page"] {
  color: var(--brand);
  border-color: var(--border-default);
  font-weight: 600;
}

/* GitHub repo button in header */
.nav-github {
  font-family: var(--font-mono);
  font-size: 12px;
}

.nav-github:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.github-repo-text {
  font-family: var(--font-mono);
}

/* Theme toggle button in header */
.theme-toggle-btn {
  height: 32px;
  box-sizing: border-box;
  padding: 0 10px;
  font-family: var(--font-sans);
  font-size: 13px;
}

.theme-icon-moon {
  display: none;
}

[data-theme="light"] .theme-icon-sun {
  display: none;
}

[data-theme="light"] .theme-icon-moon {
  display: inline-block !important;
}

#themeToggleLabel {
  font-family: var(--font-sans);
  font-size: 13px;
}

/* System/Version pill in header */
.sys-pill {
  height: 32px;
  box-sizing: border-box;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  padding: 0 10px;
  border-radius: 6px;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.dot-live {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-ok);
  box-shadow: 0 0 8px var(--status-ok);
  animation: pulse-green 2s infinite;
  flex-shrink: 0;
}

@keyframes pulse-green {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.9); }
}

/* Header CTA primary button (e.g. Install s0) */
.nav-cta,
.site-header .btn-primary {
  height: 32px;
  box-sizing: border-box;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  border-radius: 6px;
  background: var(--brand);
  color: var(--brand-on);
  border: 1px solid var(--brand);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.nav-cta:hover,
.site-header .btn-primary:hover {
  background: var(--brand-hover);
  border-color: var(--brand-hover);
  color: var(--brand-on);
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-cta:active,
.site-header .btn-primary:active {
  background: var(--brand-active);
  border-color: var(--brand-active);
  transform: translateY(0);
}

/* Responsive Header */
@media (max-width: 768px) {
  .site-header-inner {
    padding: 0 16px;
    gap: 8px;
  }
  .site-header-right,
  .site-header-nav {
    gap: 6px;
  }
  .site-logo-link {
    font-size: 1rem;
    gap: 8px;
  }
  .site-logo-link .logo-sub {
    display: none;
  }
  .nav-btn {
    padding: 0 8px;
    font-size: 12px;
  }
  .github-repo-text {
    display: none;
  }
  .nav-github {
    padding: 0 8px;
  }
  #themeToggleLabel {
    display: none;
  }
  .theme-toggle-btn {
    padding: 0 8px;
  }
  .sys-pill {
    padding: 0 8px;
    font-size: 11px;
    gap: 6px;
  }
  .nav-cta,
  .site-header .btn-primary {
    padding: 0 10px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  .site-header-inner {
    padding: 0 12px;
    gap: 6px;
  }
  .sys-pill {
    display: none;
  }
}

.header-scroll-progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--brand);
  width: 0%;
  transition: width 50ms linear;
  z-index: 1001;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  user-select: none;
}

.btn:hover {
  text-decoration: none;
}

.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary Button */
.btn-primary {
  background: var(--brand);
  color: var(--brand-on);
  border-color: var(--brand);
}

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

.btn-primary:active {
  background: var(--brand-active);
  border-color: var(--brand-active);
}

/* Secondary Button */
.btn-secondary {
  background: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--border-control);
}

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

.btn-secondary:active {
  background: var(--surface-sunken);
}

/* Danger Button */
.btn-danger {
  background: var(--status-danger-bg);
  color: var(--status-danger);
  border-color: var(--status-danger);
}

.btn-danger:hover {
  background: var(--status-danger);
  color: #FFFFFF;
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

/* Button Sizes */
.btn-sm {
  padding: 6px 10px;
  font-size: 12px;
}

.btn-lg {
  padding: 14px 24px;
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* Copy Button */
.copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--surface-raised);
  border: 1px solid var(--border-control);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  user-select: none;
}

.copy-btn:hover {
  border-color: var(--brand);
  color: var(--text-primary);
  background: var(--surface-hover);
}

.copy-btn.copied {
  background: var(--status-ok-bg);
  border-color: var(--status-ok);
  color: var(--status-ok);
}

/* --------------------------------------------------------------------------
   Cards & Panels
   -------------------------------------------------------------------------- */
.card {
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-fast), transform var(--transition-fast), background var(--transition-fast);
}

.card:hover {
  border-color: var(--border-default);
}

.card-clickable:hover {
  border-color: var(--border-hover);
  background: var(--surface-hover);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */
.tabs-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

.tab-btn.active, .tab-btn[aria-selected="true"] {
  color: var(--brand);
  border-bottom-color: var(--brand);
  font-weight: 600;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* --------------------------------------------------------------------------
   Tags, Pills & Status Dots
   -------------------------------------------------------------------------- */
.section-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--brand);
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--surface-sunken);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot-ok {
  background: var(--status-ok);
  box-shadow: 0 0 8px var(--status-ok);
}

.status-dot-warn {
  background: var(--status-warn);
}

.status-dot-danger {
  background: var(--status-danger);
}

/* --------------------------------------------------------------------------
   Form Controls
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text-primary);
  background: var(--surface-inset);
  border: 1px solid var(--border-control);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  width: 100%;
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px var(--border-focus);
}

.form-control::placeholder {
  color: var(--text-tertiary);
  opacity: 0.7;
}

/* --------------------------------------------------------------------------
   Terminal Window
   -------------------------------------------------------------------------- */
.terminal-window {
  background: var(--surface-sunken);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

.terminal-header {
  background: var(--surface-raised);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border-control);
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-tertiary);
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  overflow-x: auto;
  min-height: 180px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background: var(--surface-canvas);
  border-top: 1px solid var(--border-subtle);
  padding: 48px 0 32px;
  color: var(--text-tertiary);
  font-size: 13px;
}

.site-footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: var(--text-tertiary);
  text-decoration: none;
}

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: gap;
  gap: 16px;
}