:root {
  --bg-canvas: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-card-hover: #f0f9ff;

  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --accent-primary: #0284c7;
  --accent-primary-hover: #0369a1;
  --accent-sky-bg: #e0f2fe;
  --accent-sky-border: #bae6fd;

  --status-mandatory-border: #0284c7;
  --status-mandatory-bg: #f0f9ff;
  --status-mandatory-text: #0369a1;

  --status-beneficial-border: #bbf7d0;
  --status-beneficial-bg: #f0fdf4;
  --status-beneficial-text: #15803d;

  --status-neutral-border: #cbd5e1;
  --status-neutral-bg: #f8fafc;
  --status-neutral-text: #475569;

  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.05), 0 6px 20px rgba(15, 23, 42, 0.03);
  --shadow-modal: 0 16px 40px rgba(15, 23, 42, 0.14), 0 2px 6px rgba(15, 23, 42, 0.06);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

body {
  min-height: 100vh;
  background: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

.lab-container {
  max-width: 1080px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

/* Header */
.lab-header {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
}

.header-top-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-group {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin-top: 2px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  box-shadow: 0 2px 6px rgba(2, 132, 199, 0.25);
  flex-shrink: 0;
  text-decoration: none;
}

.title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.title-row h1 {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  line-height: 1.2;
}

.domain-suffix {
  color: var(--accent-primary);
  font-weight: 600;
  font-size: 1.15rem;
}

.subtitle {
  margin-top: 4px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge.experimental {
  background: var(--accent-sky-bg);
  color: var(--accent-primary-hover);
  border: 1px solid var(--accent-sky-border);
}

.header-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
}

.lab-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.85rem;
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--accent-primary-hover);
  text-decoration: underline;
}

.nav-sep {
  color: var(--border-medium);
  font-size: 0.8rem;
  user-select: none;
}

.os-switcher {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
}

.os-switcher-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0 7px 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.os-pill {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  transition: all 0.15s ease;
}

.os-pill:hover {
  color: var(--text-primary);
}

.os-pill.active {
  background: var(--bg-surface);
  color: var(--accent-primary);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}

/* Shared Stack Deep-Link Banner */
.shared-stack-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px;
  margin-bottom: 18px;
  background: var(--status-mandatory-bg);
  border: 1px solid var(--status-mandatory-border);
  border-radius: var(--radius-md);
  color: var(--status-mandatory-text);
  font-size: 0.86rem;
  font-weight: 500;
}

.shared-stack-code {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  background: var(--bg-surface);
  border: 1px solid var(--accent-sky-border);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
}

/* Main Download Hero Card */
.download-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  margin-bottom: 20px;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, 0.9fr);
  gap: 28px;
  align-items: center;
}

.detection-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 600;
  border: 1px solid transparent;
}

.status-pill.mandatory {
  background: var(--status-mandatory-bg);
  border-color: var(--accent-sky-border);
  color: var(--status-mandatory-text);
}

.status-pill.beneficial {
  background: var(--status-beneficial-bg);
  border-color: var(--status-beneficial-border);
  color: var(--status-beneficial-text);
}

.status-pill.neutral {
  background: var(--status-neutral-bg);
  border-color: var(--status-neutral-border);
  color: var(--status-neutral-text);
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 2px 8px;
  border-radius: 5px;
}

.hero-title {
  font-size: 1.95rem;
  font-weight: 800;
  letter-spacing: -0.028em;
  line-height: 1.18;
  color: var(--text-primary);
  margin-bottom: 20px;
}

/* Smart Store Buttons */
.cta-row {
  display: flex;
  align-items: stretch;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  background: var(--bg-surface);
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.15s ease;
  min-width: 215px;
}

.store-btn:hover {
  border-color: var(--accent-primary);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.store-btn.primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.24);
  order: -1;
}

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

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

.store-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.store-icon svg {
  width: 24px;
  height: 24px;
  display: block;
}

.store-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.2;
}

.store-kicker {
  font-size: 0.69rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.85;
}

.store-name {
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: 2px;
}

.recommended-chip {
  margin-left: auto;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.web-login-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  margin-bottom: 20px;
}

.web-login-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: 8px;
  border: 1px solid var(--accent-sky-border);
  background: var(--status-mandatory-bg);
  color: var(--status-mandatory-text);
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.15s ease;
}

.web-login-btn svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.web-login-btn:hover {
  background: var(--accent-sky-bg);
  border-color: var(--accent-primary);
  color: var(--accent-primary-hover);
  transform: translateY(-1px);
}

.platform-links-row {
  margin-bottom: 18px;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.platform-links-row a {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: none;
}

.platform-links-row a:hover {
  text-decoration: underline;
  color: var(--accent-primary-hover);
}

.samples-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.chip {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 0.77rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Right Aside: QR on Desktop, Device Spec on Mobile */
.aside-card {
  background: var(--bg-canvas);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
}

.qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
}

.qr-frame {
  width: 168px;
  height: 168px;
  padding: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}

.qr-frame svg {
  width: 100%;
  height: 100%;
  display: block;
}

.qr-caption-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
}

.qr-caption-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  max-width: 230px;
}

.device-spec-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.spec-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.group-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #475569;
}

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

.spec-list li {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.82rem;
}

.spec-key {
  color: var(--text-muted);
  font-weight: 500;
}

.spec-val {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

/* Footer */
.lab-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.79rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
}

.footer-links a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

/* Pre-Release Store Prompt Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.42);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-modal);
}

.modal-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.modal-close {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-canvas);
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.modal-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.modal-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 18px;
}

.modal-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn-action-primary,
.btn-action-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 15px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-action-primary {
  background: var(--accent-primary);
  color: #ffffff;
  border: 1px solid var(--accent-primary);
}

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

.btn-action-secondary {
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
}

.btn-action-secondary:hover {
  background: var(--bg-canvas);
  color: var(--text-primary);
}

.nav-link.active {
  color: var(--text-primary);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .download-panel {
    grid-template-columns: 1fr;
    padding: 22px 18px;
  }

  .header-controls {
    align-items: flex-start;
  }
}

@media (max-width: 560px) {
  .hero-title {
    font-size: 1.55rem;
  }

  .store-btn {
    width: 100%;
  }

  .web-login-btn,
  .web-login-row .btn-action-secondary {
    width: 100%;
    justify-content: center;
  }
}