* { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: var(--font-sans);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 80px;
    transition: background-color 0.2s ease, color 0.2s ease;
  }

  /* Spec Presentation Header */
  .spec-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 16px;
  }
  .spec-title-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 6px;
  }
  .spec-title {
    font-family: var(--font-serif);
    font-size: 28px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.2;
    margin-bottom: 8px;
  }
  .spec-desc {
    font-size: 14px;
    color: var(--text-muted);
    max-width: 820px;
  }
  .theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--surface-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-control);
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    min-height: 44px;
    transition: all 0.15s ease;
  }
  .theme-toggle-btn:hover {
    background: var(--surface-sunken);
    border-color: var(--accent);
  }
  .theme-toggle-btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }

  .container-spec {
    max-width: 1440px;
    margin: 0 auto;
    padding: 32px 24px;
  }
  .section-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 6px;
  }
  .section-title {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
  }
  .section-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
    max-width: 880px;
  }

  /* Grid of mobile screens */
  .mobile-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 350px));
    gap: 28px;
    margin-bottom: 48px;
  }
  .screen-col {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .screen-col-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .screen-col-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
  }
  .badge-state {
    font-size: 11px;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--surface-raised);
    color: var(--text-muted);
    border: 1px solid var(--border);
  }
  .badge-state.active { background: var(--accent-subtle); color: var(--accent); border-color: var(--accent); }
  .badge-state.danger { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }

  /* Device mock 390px frame */
  .device-mockup {
    width: 100%;
    max-width: 350px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 28px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.06);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
  }



  /* Status Bar */
  .status-bar {
    padding: 10px 20px 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text);
    background: var(--surface);
    border-bottom: 1px solid var(--border-subtle);
  }
  .status-bar-time { font-weight: 700; }
  .status-bar-icons { display: flex; align-items: center; gap: 6px; font-size: 11px; }

  /* App Bar Header */
  .app-header {
    background: var(--surface);
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .header-brand-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .brand-chip {
    width: 28px;
    height: 28px;
    background: var(--brand-indigo);
    color: #fff;
    font-weight: 700;
    font-size: 12px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
  }


  .header-page-title {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
  }
  .header-action-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-control);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
  }
  .header-action-btn:hover {
    background: var(--surface-raised);
    color: var(--text);
  }

  /* Scrollable Content Inside Mockup */
  .mobile-screen-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
    background: var(--bg);
  }

  /* Tab Bar Mobile */
  .tab-bar {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 8px 12px 10px;
    display: flex;
    justify-content: space-around;
    align-items: center;
  }
  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 10px;
    font-weight: 600;
    min-width: 48px;
    min-height: 44px;
    justify-content: center;
    border-radius: 6px;
  }
  .tab-item.active {
    color: var(--accent);
  }
  .tab-item svg {
    width: 20px;
    height: 20px;
  }

  /* Cards in Screen */
  .ui-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .ui-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .card-label-row {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  .ui-card-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
  }
  .ui-card-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
  }

  /* Access Status Pills */
  .status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.02em;
  }
  .status-pill.active {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
  }
  .status-pill.expired {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid var(--danger-border);
  }
  .status-pill.none {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid var(--warning-border);
  }
  .status-pill-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
  }

  /* Data Row & Items */
  .meta-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .meta-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 13px;
  }
  .meta-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .meta-key {
    color: var(--text-muted);
  }
  .meta-val {
    font-weight: 600;
    color: var(--text);
    text-align: right;
  }
  .meta-val.em-dash {
    color: var(--text-muted);
    font-weight: 500;
  }

  /* Devices list inside account card */
  .device-box {
    background: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-control);
    padding: 10px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
  }
  .device-info {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .device-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
  }
  .device-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
  }
  .device-sub {
    font-size: 11px;
    color: var(--text-muted);
  }
  .device-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--surface);
    color: var(--text-muted);
    border: 1px solid var(--border);
  }
  .device-badge.current {
    background: var(--accent-subtle);
    color: var(--accent);
    border-color: var(--accent);
  }

  /* Metrics 3-column Honest Grid */
  .metrics-3col {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
  .metric-item {
    background: var(--surface-raised);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-control);
    padding: 10px 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .metric-num {
    font-size: 20px;
    font-weight: 700;
    font-family: var(--font-sans);
    color: var(--text);
    line-height: 1.1;
  }
  .metric-num.em-dash {
    color: var(--text-muted);
    font-size: 18px;
    font-weight: 500;
  }
  .metric-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    line-height: 1.2;
  }

  /* Notice Box Honest / Safe */
  .honest-footnote {
    font-size: 11px;
    color: var(--text-muted);
    background: var(--surface-raised);
    border-left: 2px solid var(--border);
    padding: 6px 10px;
    border-radius: 0 var(--radius-control) var(--radius-control) 0;
    line-height: 1.4;
  }

  /* Exam Date Card */
  .exam-date-box {
    background: var(--surface-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-control);
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .exam-date-text-wrap {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .exam-date-val {
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
  }
  .exam-date-note {
    font-size: 11px;
    color: var(--text-muted);
  }
  .btn-sm-outline {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-control);
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
  }
  .btn-sm-outline:hover {
    background: var(--surface-sunken);
    border-color: var(--accent);
  }

  /* Buttons General */
  .btn-primary {
    background: var(--accent);
    color: var(--accent-contrast);
    border: 1px solid transparent;
    border-radius: var(--radius-control);
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    text-decoration: none;
    transition: background-color 0.15s ease;
  }
  .btn-primary:hover {
    background: var(--accent-hover);
  }
  .btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-control);
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    text-decoration: none;
    transition: background 0.15s ease;
  }
  .btn-secondary:hover {
    background: var(--surface-raised);
    border-color: var(--text-muted);
  }

  /* Link rows in Settings card */
  .nav-link-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    min-height: 44px;
  }
  .nav-link-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }
  .nav-link-row:hover {
    color: var(--accent);
  }
  .nav-link-left {
    display: flex;
    align-items: center;
    gap: 10px;
  }
  .nav-link-icon {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
  }

  /* Empty state specific */
  .empty-callout {
    background: var(--surface-raised);
    border: 1px dashed var(--border);
    border-radius: var(--radius-control);
    padding: 18px 14px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
  }
  .empty-callout-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--surface);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    margin-bottom: 2px;
  }
  .empty-callout-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
  }
  .empty-callout-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
    max-width: 260px;
  }

  /* Expired alert */
  .alert-box {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    border-radius: var(--radius-control);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .alert-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--danger);
  }
  .alert-desc {
    font-size: 12px;
    color: var(--text);
    line-height: 1.4;
  }

  /* Loading Skeleton Mockup */
  .skeleton-bar {
    background: linear-gradient(90deg, var(--border-subtle) 25%, var(--surface-raised) 50%, var(--border-subtle) 75%);
    background-size: 200% 100%;
    animation: skeleton-pulse 1.8s infinite ease-in-out;
    border-radius: 4px;
  }
  @keyframes skeleton-pulse {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    .skeleton-bar { animation: none; opacity: 0.6; }
  }

  /* Desktop Arrangement 1280px */
  .desktop-viewport-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 48px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.04);
  }
  .browser-chrome {
    background: var(--surface-raised);
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 16px;
  }
  .browser-dots {
    display: flex;
    gap: 6px;
  }
  .browser-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
  }
  .browser-url-bar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 4px 14px;
    font-size: 12px;
    color: var(--text-muted);
    flex: 1;
    max-width: 480px;
  }

  .desktop-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 720px;
  }
  .desktop-sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  .sidebar-top {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }
  .brand-block {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-left: 4px;
  }
  .brand-block-title {
    font-weight: 700;
    font-size: 15px;
    line-height: 1.2;
  }
  .brand-block-sub {
    font-size: 11px;
    color: var(--text-muted);
  }
  .sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-control);
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    min-height: 44px;
    transition: all 0.15s ease;
  }
  .sidebar-link:hover {
    background: var(--surface-raised);
    color: var(--text);
  }
  .sidebar-link.active {
    background: var(--accent-subtle);
    color: var(--accent);
    font-weight: 700;
  }
  .sidebar-bottom {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
  }
  .user-badge-sidebar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 6px;
  }
  .user-avatar-placeholder {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--surface-raised);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
    color: var(--accent);
  }
  .user-meta-sidebar {
    display: flex;
    flex-direction: column;
    font-size: 12px;
  }
  .user-email-sidebar {
    font-weight: 600;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 140px;
  }
  .user-plan-sidebar {
    font-size: 11px;
    color: var(--success);
    font-weight: 600;
  }

  /* Desktop Main Area */
  .desktop-content {
    background: var(--bg);
    padding: 36px 48px;
    display: flex;
    flex-direction: column;
    gap: 28px;
  }
  .desktop-header-area {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
  }
  .desktop-page-title {
    font-family: var(--font-serif);
    font-size: 30px;
    font-weight: 600;
    color: var(--text);
  }
  .desktop-page-sub {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
  }

  /* Desktop 2-column Grid for Profile cards */
  .desktop-profile-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 24px;
    max-width: 1080px;
  }
  .grid-col {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  /* Audit Table Matrix */
  .audit-table-wrap {
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    margin-top: 32px;
  }
  .audit-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
  }
  .audit-table th, .audit-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
  }
  .audit-table th {
    background: var(--surface-raised);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
  }
  .audit-table tr:last-child td {
    border-bottom: none;
  }
  .pill-prohibition {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--danger);
    font-weight: 700;
    background: var(--danger-bg);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--danger-border);
    font-size: 11px;
  }
  .pill-honest {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--success);
    font-weight: 700;
    background: var(--success-bg);
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid var(--success-border);
    font-size: 11px;
  }

  /* Focus ring accessibility */
  button:focus-visible, a:focus-visible, input:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }