/* — Design tokens — */
    :root {
      --font-body: 'Geist', Inter, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

      /* spacing */
      --space-3xs: 0.25rem;
      --space-2xs: 0.375rem;
      --space-xs: 0.5rem;
      --space-sm: 0.75rem;
      --space-md: 1rem;
      --space-lg: 1.5rem;
      --space-xl: 2rem;
      --space-2xl: 3rem;
      --space-3xl: 4rem;

      /* radii */
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 8px;
      --radius-xl: 8px;
      --radius-full: 9999px;

      /* motion */
      --duration-fast: 120ms;
      --duration-base: 200ms;
      --duration-slow: 320ms;
      --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
      --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);

      /* z-index */
      --z-base: 1;
      --z-focus: 10;
      --z-toast: 50;
      --z-overlay: 100;
    }

    :root[data-theme="dark"] {
      color-scheme: dark;
      --bg-base: #0a0b0c;
      --bg-elevated: #111214;
      --bg-surface: #17181b;
      --bg-panel: #1c1d21;
      --bg-input: #121316;
      --bg-hover: rgba(255, 255, 255, 0.04);
      --bg-active: rgba(255, 255, 255, 0.07);
      --bg-subtle: rgba(255, 255, 255, 0.02);

      --text-primary: #f3f0eb;
      --text-secondary: #a7a49e;
      --text-tertiary: #6e6b66;
      --text-muted: #4a4743;
      --text-inverse: #0a0b0c;

      --border-default: rgba(255, 255, 255, 0.09);
      --border-subtle: rgba(255, 255, 255, 0.05);
      --border-strong: rgba(255, 255, 255, 0.16);
      --border-accent: rgba(179, 140, 255, 0.45);

      --accent: #B38CFF;
      --accent-hover: #C4A3FF;
      --accent-active: #9E74F0;
      --accent-subtle: rgba(179, 140, 255, 0.12);
      --accent-glow: rgba(179, 140, 255, 0.18);

      --amber: #c49b5b;
      --amber-subtle: rgba(196, 155, 91, 0.12);

      --violet: #8b8bb5;
      --violet-subtle: rgba(139, 139, 181, 0.12);

      --error: #e56e6e;
      --error-subtle: rgba(229, 110, 110, 0.12);
      --success: #4db394;
      --success-subtle: rgba(77, 179, 148, 0.12);
      --warning: #d8a353;
      --warning-subtle: rgba(216, 163, 83, 0.12);
      --info: #6b9ed8;
      --info-subtle: rgba(107, 158, 216, 0.12);

      --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.45);
      --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.55);
      --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.65);
      --shadow-focus: 0 0 0 2px var(--bg-base), 0 0 0 4px var(--border-accent);

      --noise-opacity: 0.04;
      --radial-1: radial-gradient(ellipse 80% 60% at 20% 30%, rgba(179, 140, 255, 0.09), transparent 55%);
      --radial-2: radial-gradient(ellipse 60% 50% at 85% 15%, rgba(139, 139, 181, 0.06), transparent 50%);
      --radial-3: radial-gradient(ellipse 70% 40% at 70% 90%, rgba(196, 155, 91, 0.05), transparent 50%);
    }

    :root[data-theme="light"] {
      color-scheme: light;
      --bg-base: #f5f4f1;
      --bg-elevated: #ffffff;
      --bg-surface: #faf9f7;
      --bg-panel: #ffffff;
      --bg-input: #ffffff;
      --bg-hover: rgba(10, 11, 12, 0.04);
      --bg-active: rgba(10, 11, 12, 0.07);
      --bg-subtle: rgba(10, 11, 12, 0.02);

      --text-primary: #17181b;
      --text-secondary: #52514d;
      --text-tertiary: #7a7975;
      --text-muted: #a8a7a3;
      --text-inverse: #ffffff;

      --border-default: rgba(10, 11, 12, 0.10);
      --border-subtle: rgba(10, 11, 12, 0.06);
      --border-strong: rgba(10, 11, 12, 0.18);
      --border-accent: rgba(158, 116, 240, 0.45);

      --accent: #9E74F0;
      --accent-hover: #8B5CF6;
      --accent-active: #7C3AED;
      --accent-subtle: rgba(158, 116, 240, 0.10);
      --accent-glow: rgba(158, 116, 240, 0.14);

      --amber: #9a7437;
      --amber-subtle: rgba(154, 116, 55, 0.10);

      --violet: #6b6b94;
      --violet-subtle: rgba(107, 107, 148, 0.10);

      --error: #c95050;
      --error-subtle: rgba(201, 80, 80, 0.10);
      --success: #2f8a6d;
      --success-subtle: rgba(47, 138, 109, 0.10);
      --warning: #b07f2e;
      --warning-subtle: rgba(176, 127, 46, 0.10);
      --info: #4b7bbd;
      --info-subtle: rgba(75, 123, 189, 0.10);

      --shadow-sm: 0 1px 2px rgba(10, 11, 12, 0.08);
      --shadow-md: 0 4px 16px rgba(10, 11, 12, 0.10);
      --shadow-lg: 0 12px 40px rgba(10, 11, 12, 0.14);
      --shadow-focus: 0 0 0 2px var(--bg-base), 0 0 0 4px var(--border-accent);

      --noise-opacity: 0.025;
      --radial-1: radial-gradient(ellipse 80% 60% at 20% 30%, rgba(33, 138, 127, 0.07), transparent 55%);
      --radial-2: radial-gradient(ellipse 60% 50% at 85% 15%, rgba(107, 107, 148, 0.05), transparent 50%);
      --radial-3: radial-gradient(ellipse 70% 40% at 70% 90%, rgba(154, 116, 55, 0.04), transparent 50%);
    }

    /* — Reset & base — */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      min-height: 100vh;
      font-family: var(--font-body);
      background: var(--bg-base);
      color: var(--text-primary);
      line-height: 1.55;
      overflow-x: hidden;
    }

    a {
      color: var(--accent);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    a:focus-visible {
      outline: none;
      border-radius: var(--radius-sm);
      box-shadow: 0 0 0 2px var(--accent);
    }

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

    input {
      font: inherit;
    }

    /* — Background atmosphere — */
    .bg-atmosphere {
      position: fixed;
      inset: 0;
      z-index: -2;
      background:
        var(--radial-1),
        var(--radial-2),
        var(--radial-3),
        var(--bg-base);
    }

    .bg-grid {
      position: fixed;
      inset: 0;
      z-index: -1;
      pointer-events: none;
      background-image:
        linear-gradient(var(--border-subtle) 1px, transparent 1px),
        linear-gradient(90deg, var(--border-subtle) 1px, transparent 1px);
      background-size: 64px 64px;
      mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black, transparent 75%);
      opacity: 0.6;
    }

    .bg-noise {
      position: fixed;
      inset: 0;
      z-index: -1;
      pointer-events: none;
      opacity: var(--noise-opacity);
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    }

    /* — Layout shell — */
    .shell {
      display: grid;
      grid-template-rows: auto 1fr auto;
      min-height: 100vh;
      position: relative;
    }

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

    .brand {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }

    .brand-logo {
      width: 28px;
      height: 28px;
      flex-shrink: 0;
      transition: filter .2s;
    }
    .brand:hover .brand-logo {
      filter: drop-shadow(0 0 6px rgba(179,140,255,.35));
    }

    .brand-name {
      font-weight: 600;
      font-size: 1.125rem;
      letter-spacing: -0.02em;
      color: var(--text-primary);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }

    .main {
      display: grid;
      grid-template-columns: 1fr minmax(360px, 480px);
      gap: var(--space-2xl);
      padding: var(--space-xl) var(--space-lg);
      align-items: start;
      justify-content: center;
      max-width: 1440px;
      margin: 0 auto;
      width: 100%;
    }

    @media (min-width: 1280px) {
      .main {
        grid-template-columns: 1fr minmax(420px, 520px);
        padding: var(--space-2xl) var(--space-3xl);
      }
    }

    @media (max-width: 900px) {
      .main {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
        padding: var(--space-lg);
      }
    }

    /* — Atmosphere panel — */
    .atmosphere {
      display: flex;
      flex-direction: column;
      gap: var(--space-xl);
      padding-top: var(--space-lg);
      max-width: 480px;
    }

    @media (max-width: 900px) {
      .atmosphere {
        max-width: 100%;
        padding-top: 0;
        order: 1;
      }
    }

    .hero-title {
      font-size: clamp(2rem, 5vw, 3.25rem);
      font-weight: 700;
      line-height: 1.05;
      letter-spacing: -0.04em;
      color: var(--text-primary);
    }

    .hero-title span {
      color: var(--accent);
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-secondary);
      max-width: 460px;
      line-height: 1.6;
    }

    .glyph-divider {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      color: var(--text-muted);
      font-family: var(--font-mono);
      font-size: 0.75rem;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }

    .glyph-divider::before,
    .glyph-divider::after {
      content: '';
      flex: 1;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
      max-width: 160px;
    }

    .glyph-divider::after {
      background: linear-gradient(90deg, var(--border-strong), transparent, var(--border-strong));
    }

    .trust-list {
      display: grid;
      gap: var(--space-sm);
    }

    .trust-item {
      display: flex;
      align-items: flex-start;
      gap: var(--space-sm);
      padding: var(--space-sm) var(--space-md);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      background: var(--bg-subtle);
      transition: background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
    }

    .trust-item:hover {
      background: var(--bg-hover);
      border-color: var(--border-default);
    }

    .trust-icon {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
      margin-top: 0.15rem;
      color: var(--accent);
    }

    .trust-text {
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    .trust-text strong {
      color: var(--text-primary);
      font-weight: 400;
    }

    .terminal-preview {
      border: 1px solid var(--border-default);
      border-radius: var(--radius-lg);
      background: var(--bg-panel);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .terminal-header {
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      padding: var(--space-sm) var(--space-md);
      border-bottom: 1px solid var(--border-subtle);
      background: var(--bg-surface);
    }

    .terminal-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--text-muted);
    }

    .terminal-dot:nth-child(1) { background: var(--error); }
    .terminal-dot:nth-child(2) { background: var(--amber); }
    .terminal-dot:nth-child(3) { background: var(--success); }

    .terminal-title {
      margin-left: auto;
      font-family: var(--font-mono);
      font-size: 0.6875rem;
      color: var(--text-tertiary);
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .terminal-body {
      padding: var(--space-md);
      font-family: var(--font-mono);
      font-size: 0.8125rem;
      line-height: 1.6;
      color: var(--text-secondary);
    }

    .terminal-line {
      display: flex;
      gap: var(--space-sm);
    }

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

    .terminal-cursor {
      display: inline-block;
      width: 6px;
      height: 1em;
      background: var(--accent);
      margin-left: 2px;
      vertical-align: text-bottom;
      animation: cursor-pulse 1.2s step-end infinite;
    }

    @media (prefers-reduced-motion: reduce) {
      .terminal-cursor {
        animation: none;
      }
    }

    @keyframes cursor-pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0; }
    }

    /* — Auth system — */
    .auth-system {
      position: relative;
    }

    .auth-card {
      border: 1px solid var(--border-default);
      border-radius: var(--radius-xl);
      background: var(--bg-panel);
      box-shadow: var(--shadow-lg);
      overflow: hidden;
    }

    .auth-card-header {
      padding: var(--space-md);
      border-bottom: 1px solid var(--border-subtle);
      background: var(--bg-surface);
    }

    .mode-switcher {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-2xs);
      padding: var(--space-2xs);
      border-radius: var(--radius-md);
      background: var(--bg-input);
      border: 1px solid var(--border-subtle);
    }

    .mode-btn {
      position: relative;
      padding: var(--space-sm) var(--space-xs);
      border-radius: var(--radius-sm);
      font-size: 0.8125rem;
      font-weight: 400;
      color: var(--text-secondary);
      text-align: center;
      transition: color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
    }

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

    .mode-btn[aria-selected="true"] {
      color: var(--text-primary);
      background: var(--bg-panel);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-default);
    }

    .mode-btn:focus-visible {
      outline: none;
      z-index: var(--z-focus);
      box-shadow: var(--shadow-focus);
    }

    .auth-card-body {
      padding: var(--space-lg);
    }

    .section-title {
      font-size: 1.25rem;
      font-weight: 600;
      letter-spacing: -0.02em;
      margin-bottom: var(--space-xs);
      color: var(--text-primary);
    }

    .section-desc {
      font-size: 0.875rem;
      color: var(--text-secondary);
      margin-bottom: var(--space-lg);
    }

    /* — Tabs — */
    .tabs {
      display: flex;
      gap: var(--space-xs);
      margin-bottom: var(--space-lg);
      border-bottom: 1px solid var(--border-subtle);
    }

    .tab-btn {
      position: relative;
      padding: var(--space-sm) var(--space-md);
      font-size: 0.875rem;
      font-weight: 400;
      color: var(--text-secondary);
      border-bottom: 2px solid transparent;
      margin-bottom: -1px;
      transition: color var(--duration-fast) var(--ease-out);
    }

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

    .tab-btn[aria-selected="true"] {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }

    .tab-btn:focus-visible {
      outline: none;
      border-radius: var(--radius-sm) var(--radius-sm) 0 0;
      box-shadow: inset 0 0 0 2px var(--accent);
    }

    .tab-panel {
      display: none;
    }

    .tab-panel[aria-hidden="false"] {
      display: block;
      animation: panel-reveal var(--duration-base) var(--ease-out);
    }

    @media (prefers-reduced-motion: reduce) {
      .tab-panel[aria-hidden="false"] {
        animation: none;
      }
    }

    @keyframes panel-reveal {
      from { opacity: 0; transform: translateY(4px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* — Forms — */
    .form-group {
      margin-bottom: var(--space-md);
    }

    .form-label {
      display: block;
      font-size: 0.8125rem;
      font-weight: 400;
      color: var(--text-secondary);
      margin-bottom: var(--space-2xs);
    }

    .form-label .hint {
      font-weight: 400;
      color: var(--text-tertiary);
      margin-left: var(--space-xs);
    }

    .input-wrap {
      position: relative;
      display: flex;
      align-items: center;
    }

    .input {
      width: 100%;
      padding: var(--space-sm) var(--space-md);
      padding-right: 2.5rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-default);
      background: var(--bg-input);
      color: var(--text-primary);
      font-size: 0.9375rem;
      line-height: 1.5;
      transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
    }

    .input::placeholder {
      color: var(--text-muted);
    }

    .input:hover {
      border-color: var(--border-strong);
    }

    .input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

    .input[aria-invalid="true"] {
      border-color: var(--error);
      background: var(--error-subtle);
    }

    .input[aria-invalid="true"]:focus {
      box-shadow: 0 0 0 3px var(--error-subtle);
    }

    .input-suffix {
      position: absolute;
      right: var(--space-sm);
      display: flex;
      align-items: center;
      color: var(--text-tertiary);
    }

    .toggle-password {
      padding: var(--space-2xs);
      border-radius: var(--radius-sm);
      color: var(--text-tertiary);
      transition: color var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
    }

    .toggle-password:hover {
      color: var(--text-primary);
      background: var(--bg-hover);
    }

    .toggle-password:focus-visible {
      outline: none;
      box-shadow: 0 0 0 2px var(--accent);
    }

    .toggle-password svg {
      width: 18px;
      height: 18px;
    }

    .form-error {
      display: flex;
      align-items: center;
      gap: var(--space-2xs);
      margin-top: var(--space-2xs);
      font-size: 0.8125rem;
      color: var(--error);
    }

    .form-help {
      margin-top: var(--space-2xs);
      font-size: 0.75rem;
      color: var(--text-tertiary);
    }

    .form-options {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: var(--space-sm);
      margin-bottom: var(--space-md);
      flex-wrap: wrap;
    }

    .checkbox {
      display: flex;
      align-items: center;
      gap: var(--space-2xs);
      font-size: 0.8125rem;
      color: var(--text-secondary);
      cursor: pointer;
    }

    .checkbox input {
      width: 16px;
      height: 16px;
      accent-color: var(--accent);
      cursor: pointer;
    }

    .checkbox:focus-within {
      outline: none;
      border-radius: var(--radius-sm);
      box-shadow: 0 0 0 2px var(--accent);
    }

    .link-subtle {
      font-size: 0.8125rem;
      color: var(--text-tertiary);
    }

    .link-subtle:hover {
      color: var(--accent);
    }

    /* — Buttons — */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-xs);
      padding: var(--space-sm) var(--space-md);
      border-radius: 9999px;
      font-size: 0.875rem;
      font-weight: 400;
      line-height: 1.5;
      transition: transform var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
    }

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

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

    .btn-primary {
      width: 100%;
      background: var(--accent);
      color: var(--text-inverse);
      border: 1px solid transparent;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 0 20px var(--accent-glow);
    }

    .btn-primary:active {
      background: var(--accent-active);
    }

    .btn-primary:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      box-shadow: none;
    }

    .btn-secondary {
      width: 100%;
      background: var(--bg-input);
      color: var(--text-primary);
      border: 1px solid var(--border-default);
    }

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

    .btn-ghost {
      color: var(--text-secondary);
      border: 1px solid transparent;
      background: transparent;
    }

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

    .btn-oauth {
      width: 100%;
      background: var(--bg-input);
      color: var(--text-primary);
      border: 1px solid var(--border-default);
    }

    .btn-oauth:hover {
      background: var(--bg-hover);
      border-color: var(--border-strong);
    }

    .btn-oauth svg {
      width: 18px;
      height: 18px;
    }

    .btn-row {
      display: flex;
      gap: var(--space-sm);
    }

    .btn-row .btn {
      flex: 1;
    }

    /* — Dividers — */
    .divider {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      margin: var(--space-md) 0;
      color: var(--text-muted);
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .divider::before,
    .divider::after {
      content: '';
      flex: 1;
      height: 1px;
      background: var(--border-subtle);
    }

    /* — Banners — */
    .banner {
      display: none;
      align-items: flex-start;
      gap: var(--space-sm);
      padding: var(--space-sm) var(--space-md);
      border-radius: var(--radius-md);
      border: 1px solid;
      margin-bottom: var(--space-md);
      font-size: 0.875rem;
      animation: banner-in var(--duration-base) var(--ease-out);
    }

    .banner[aria-hidden="false"] {
      display: flex;
    }

    @media (prefers-reduced-motion: reduce) {
      .banner[aria-hidden="false"] {
        animation: none;
      }
    }

    @keyframes banner-in {
      from { opacity: 0; transform: translateY(-4px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .banner-icon {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
      margin-top: 0.15rem;
    }

    .banner-content {
      flex: 1;
    }

    .banner-title {
      font-weight: 600;
      margin-bottom: var(--space-3xs);
    }

    .banner-message {
      color: var(--text-secondary);
      line-height: 1.5;
    }

    .banner-success {
      background: var(--success-subtle);
      border-color: rgba(77, 179, 148, 0.25);
      color: var(--success);
    }

    .banner-error {
      background: var(--error-subtle);
      border-color: rgba(229, 110, 110, 0.25);
      color: var(--error);
    }

    .banner-warning {
      background: var(--warning-subtle);
      border-color: rgba(216, 163, 83, 0.25);
      color: var(--warning);
    }

    .banner-info {
      background: var(--info-subtle);
      border-color: rgba(107, 158, 216, 0.25);
      color: var(--info);
    }

    /* — State panels — */
    .state-panel {
      display: none;
      text-align: center;
      padding: var(--space-xl) var(--space-md);
    }

    .state-panel[aria-hidden="false"] {
      display: block;
      animation: panel-reveal var(--duration-base) var(--ease-out);
    }

    .state-icon {
      width: 48px;
      height: 48px;
      margin: 0 auto var(--space-md);
      color: var(--accent);
    }

    .state-icon.spin {
      animation: spin 1.4s linear infinite;
    }

    @media (prefers-reduced-motion: reduce) {
      .state-icon.spin {
        animation: none;
      }
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    .state-title {
      font-size: 1.125rem;
      font-weight: 600;
      margin-bottom: var(--space-xs);
      color: var(--text-primary);
    }

    .state-desc {
      font-size: 0.875rem;
      color: var(--text-secondary);
      margin-bottom: var(--space-lg);
      max-width: 320px;
      margin-inline: auto;
    }

    .state-meta {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-tertiary);
      padding: var(--space-sm) var(--space-md);
      border-radius: var(--radius-md);
      background: var(--bg-input);
      border: 1px solid var(--border-subtle);
      display: inline-block;
      margin-bottom: var(--space-md);
    }

    .state-meta .label {
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .state-meta .value {
      color: var(--text-secondary);
    }

    /* — Enterprise panel — */
    .enterprise-ornament {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      margin-bottom: var(--space-md);
      padding: var(--space-sm) var(--space-md);
      border-radius: var(--radius-md);
      background: var(--accent-subtle);
      border: 1px solid var(--border-accent);
    }

    .enterprise-ornament svg {
      width: 20px;
      height: 20px;
      color: var(--accent);
    }

    .enterprise-ornament-text {
      font-size: 0.8125rem;
      color: var(--text-secondary);
    }

    .verified-badge {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2xs);
      padding: var(--space-2xs) var(--space-sm);
      border-radius: var(--radius-full);
      background: var(--success-subtle);
      border: 1px solid rgba(77, 179, 148, 0.25);
      font-size: 0.75rem;
      font-weight: 400;
      color: var(--success);
      font-family: var(--font-mono);
    }

    .sso-provider {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      padding: var(--space-md);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-default);
      background: var(--bg-input);
      margin-bottom: var(--space-md);
    }

    .sso-provider-icon {
      width: 32px;
      height: 32px;
      border-radius: var(--radius-md);
      background: var(--bg-surface);
      display: grid;
      place-items: center;
      color: var(--accent);
      border: 1px solid var(--border-subtle);
    }

    .sso-provider-name {
      font-weight: 600;
      font-size: 0.9375rem;
      color: var(--text-primary);
    }

    .sso-provider-domain {
      font-size: 0.75rem;
      color: var(--text-tertiary);
      font-family: var(--font-mono);
    }

    .back-link {
      display: inline-flex;
      align-items: center;
      gap: var(--space-2xs);
      font-size: 0.8125rem;
      color: var(--text-tertiary);
      margin-top: var(--space-md);
    }

    .back-link:hover {
      color: var(--accent);
    }

    /* — Skeleton — */
    .skeleton {
      display: none;
      flex-direction: column;
      gap: var(--space-md);
    }

    .skeleton[aria-hidden="false"] {
      display: flex;
    }

    .skeleton-line {
      height: 44px;
      border-radius: var(--radius-md);
      background: linear-gradient(90deg, var(--bg-input) 25%, var(--bg-hover) 50%, var(--bg-input) 75%);
      background-size: 200% 100%;
      animation: skeleton-shimmer 1.6s infinite linear;
    }

    @media (prefers-reduced-motion: reduce) {
      .skeleton-line {
        animation: none;
        background: var(--bg-input);
      }
    }

    @keyframes skeleton-shimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }

    .skeleton-line.short { width: 60%; }
    .skeleton-line.tiny { width: 40%; height: 20px; }

    /* — Footer — */
    .footer {
      padding: var(--space-md) var(--space-lg);
      border-top: 1px solid var(--border-subtle);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: var(--space-sm);
      font-size: 0.75rem;
      color: var(--text-tertiary);
    }

    .footer-links {
      display: flex;
      gap: var(--space-md);
    }

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

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

    /* — Theme toggle — */
    .theme-toggle {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-default);
      background: var(--bg-input);
      color: var(--text-secondary);
      transition: background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out), border-color var(--duration-fast) var(--ease-out);
    }

    .theme-toggle:hover {
      background: var(--bg-hover);
      color: var(--text-primary);
      border-color: var(--border-strong);
    }

    .theme-toggle:focus-visible {
      outline: none;
      box-shadow: var(--shadow-focus);
    }

    .theme-toggle svg {
      width: 18px;
      height: 18px;
    }

    /* — Utilities — */
    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }

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

    .text-secondary { color: var(--text-secondary); }
    .text-tertiary { color: var(--text-tertiary); }

    .mb-0 { margin-bottom: 0; }
    .mb-sm { margin-bottom: var(--space-sm); }
    .mb-md { margin-bottom: var(--space-md); }
    .mt-md { margin-top: var(--space-md); }
    .mt-lg { margin-top: var(--space-lg); }

    .ml-auto { margin-left: auto; }
    .ml-md { margin-left: var(--space-md); }

    .hidden {
      display: none !important;
    }

    /* — Scanline accent — */
    .scanline {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 1px;
      background: var(--accent);
      opacity: 0;
      pointer-events: none;
      z-index: var(--z-overlay);
      transition: opacity var(--duration-base) var(--ease-out);
    }

    .scanline.active {
      opacity: 0.4;
    }

    /* — Reduced motion — */
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    /* — Mobile polish — */
    @media (max-width: 480px) {
      .header {
        padding: var(--space-sm) var(--space-md);
      }

      .main {
        padding: var(--space-md);
      }

      .auth-card-body {
        padding: var(--space-md);
      }

      .mode-switcher {
        grid-template-columns: 1fr;
      }

      .mode-btn {
        padding: var(--space-sm);
      }

      .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
      }

      .tabs::-webkit-scrollbar {
        display: none;
      }

      .footer {
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-md);
      }
    }