:root {
      --page: #F0F0F0;
      --surface: #FFFFFF;
      --control: #FFFFFF;
      --control-hover: #E7E7E7;
      --selected: #0140EF;
      --selected-strong: #0038D6;
      --text: #010101;
      --muted: #666666;
      --accent: #0140EF;
      --accent-hover: #0038D6;
      --accent-text: #FFFFFF;
      --focus: #0140EF;
      --placeholder: #8A8A8A;
      --content-width: 760px;
      --navigation-width: 1180px;
      --radius-sm: 12px;
      --radius-md: 16px;
      --radius-lg: 22px;
    }

    * { box-sizing: border-box; }

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
      text-size-adjust: 100%;
    }

    body {
      margin: 0;
      background: var(--page);
      color: var(--text);
      font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 16px;
      line-height: 1.55;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
      overflow-x: hidden;
      overscroll-behavior-x: none;
    }

    button,
    input,
    textarea {
      font: inherit;
      color: inherit;
    }

    button {
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      touch-action: manipulation;
    }

    input,
    textarea {
      -webkit-appearance: none;
      appearance: none;
    }

    [hidden] { display: none !important; }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: var(--page);
      padding-top: env(safe-area-inset-top);
    }

    .site-header__inner {
      width: min(calc(100% - 48px), var(--navigation-width));
      min-height: 88px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 120px minmax(0, 1fr) 120px;
      align-items: center;
      gap: 36px;
      padding-bottom: 12px;
    }

    .navigation-button,
    .next-step-button,
    .action-button {
      min-height: 46px;
      border: 0;
      border-radius: var(--radius-sm);
      padding: 0 16px;
      background: var(--control);
      font-size: 14px;
      line-height: 1;
      font-weight: 600;
      transition: background .14s ease, color .14s ease;
      touch-action: manipulation;
    }

    @media (hover: hover) and (pointer: fine) {
      .navigation-button:hover,
      .action-button:hover {
        background: var(--control-hover);
      }
    }

    .navigation-button--back { justify-self: start; }

    .navigation-button--next,
    .next-step-button {
      justify-self: end;
      background: var(--accent);
      color: var(--accent-text);
    }

    @media (hover: hover) and (pointer: fine) {
      .navigation-button--next:hover,
      .next-step-button:hover {
        background: var(--accent-hover);
      }
    }

    .navigation-button:disabled {
      visibility: hidden;
    }

    .navigation-button:focus-visible,
    .option:focus-within,
    .form-input:focus-visible,
    .form-textarea:focus-visible,
    .next-step-button:focus-visible,
    .action-button:focus-visible {
      outline: 2px solid var(--focus);
      outline-offset: 3px;
    }

    .brief-progress {
      min-width: 0;
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      align-items: center;
      gap: 20px;
    }

    .brief-progress__main { min-width: 0; }

    .brief-progress__title {
      overflow: hidden;
      margin-bottom: 9px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 500;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    .brief-progress__track {
      height: 6px;
      overflow: hidden;
      border-radius: 999px;
      background: var(--control);
    }

    .brief-progress__fill {
      width: 0;
      height: 100%;
      border-radius: inherit;
      background: var(--accent);
      transition: width .22s ease;
    }

    .brief-progress__count {
      color: var(--muted);
      font-size: 14px;
      font-weight: 500;
      white-space: nowrap;
    }

    main {
      width: min(calc(100% - 48px), var(--content-width));
      margin: 0 auto;
      padding: 96px 0 calc(136px + env(safe-area-inset-bottom));
    }

    .brief-step { animation: appear .16s ease; }

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

    .step-eyebrow {
      margin-bottom: 16px;
      color: var(--muted);
      font-size: 14px;
      font-weight: 500;
    }

    h1 {
      max-width: 680px;
      margin: 0;
      font-size: clamp(34px, 4vw, 44px);
      line-height: 1.08;
      letter-spacing: -0.04em;
      font-weight: 600;
      overflow-wrap: anywhere;
    }

    .step-intro {
      max-width: 620px;
      margin: 20px 0 0;
      color: var(--muted);
      font-size: 16px;
      line-height: 1.65;
    }

    .field-list {
      display: grid;
      gap: 64px;
      margin-top: 80px;
    }

    .form-field {
      min-width: 0;
      display: grid;
      gap: 16px;
    }

    .field-label,
    .form-field > label {
      margin: 0;
      font-size: 16px;
      line-height: 1.5;
      font-weight: 600;
    }

    .field-hint {
      margin-top: -8px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.55;
    }

    .form-input,
    .form-textarea {
      width: 100%;
      border: 0;
      border-radius: var(--radius-md);
      outline: 0;
      background: var(--surface);
      font-size: 16px;
      line-height: 1.45;
      transition: background .14s ease;
    }

    .form-input {
      min-height: 58px;
      padding: 0 18px;
    }

    .form-textarea {
      min-height: 144px;
      padding: 17px 18px;
      resize: vertical;
      overflow-wrap: anywhere;
    }

    .form-input::placeholder,
    .form-textarea::placeholder {
      color: var(--placeholder);
    }

    .form-input:hover,
    .form-textarea:hover {
      background: #F7F7F7;
    }

    .form-input:focus,
    .form-textarea:focus {
      background: var(--surface);
    }

    .option-list {
      display: grid;
      gap: 10px;
    }

    .option {
      position: relative;
      display: grid;
      grid-template-columns: 20px minmax(0, 1fr);
      align-items: center;
      gap: 14px;
      min-height: 56px;
      padding: 0 16px;
      border-radius: var(--radius-md);
      background: #E5E5E5;
      cursor: pointer;
      user-select: none;
      transition: background .14s ease;
      -webkit-tap-highlight-color: transparent;
    }

    @media (hover: hover) and (pointer: fine) {
      .option:hover {
        background: var(--control-hover);
      }
    }

    .option:has(input:checked) {
      background: var(--selected);
      color: var(--accent-text);
    }

    @media (hover: hover) and (pointer: fine) {
      .option:has(input:checked):hover {
        background: var(--selected-strong);
      }
    }

    .option input {
      position: absolute;
      opacity: 0;
      pointer-events: none;
    }

    .option__mark {
      position: relative;
      width: 18px;
      height: 18px;
      border: 0;
      border-radius: 6px;
      background: var(--surface);
      transition: background .12s ease;
    }

    .option--radio .option__mark {
      border-radius: 50%;
    }

    .option input:checked + .option__mark {
      background: var(--accent-text);
    }

    .option input:checked + .option__mark::after {
      content: "";
      position: absolute;
      left: 5px;
      top: 2px;
      width: 5px;
      height: 9px;
      border-right: 2px solid var(--accent);
      border-bottom: 2px solid var(--accent);
      transform: rotate(45deg);
    }

    .option--radio input:checked + .option__mark::after {
      left: 5px;
      top: 5px;
      width: 8px;
      height: 8px;
      border: 0;
      border-radius: 50%;
      background: var(--accent);
      transform: none;
    }

    .option__text {
      padding: 16px 0;
      font-size: 16px;
      line-height: 1.45;
    }

    .option:has(input:checked) .option__text {
      font-weight: 600;
    }

    .other-option-input {
      margin-top: 2px;
      background: var(--surface);
    }

    .step-actions {
      display: flex;
      justify-content: flex-end;
      margin-top: 80px;
    }

    .next-step-button {
      min-width: 116px;
    }

    .completion-screen {
      padding-top: 12px;
    }

    .completion-screen p {
      max-width: 580px;
      margin: 20px 0 0;
      color: var(--muted);
      font-size: 16px;
      line-height: 1.65;
    }

    .submission-note {
      color: var(--muted);
      font-size: 14px;
    }

    .submission-note--success {
      color: #16723a;
    }

    .submission-note--error {
      color: #a52d2d;
    }

    .completion-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 36px;
    }

    .action-button:first-child {
      background: var(--accent);
      color: var(--accent-text);
    }

    @media (hover: hover) and (pointer: fine) {
      .action-button:first-child:hover {
        background: var(--accent-hover);
      }
    }

    .answer-summary {
      display: grid;
      gap: 72px;
      margin-top: 96px;
    }

    .summary-section {
      display: grid;
      gap: 28px;
    }

    .summary-section h2 {
      margin: 0;
      font-size: 22px;
      line-height: 1.3;
      letter-spacing: -0.02em;
      font-weight: 600;
    }

    .summary-item {
      display: grid;
      gap: 8px;
    }

    .summary-question {
      color: var(--muted);
      font-size: 14px;
      line-height: 1.5;
    }

    .summary-answer {
      padding: 18px 20px;
      border-radius: var(--radius-md);
      background: var(--surface);
      font-size: 16px;
      line-height: 1.55;
      white-space: pre-wrap;
      word-break: break-word;
    }

    .summary-answer--empty {
      color: var(--placeholder);
      background: var(--control);
    }

    @media (max-width: 720px) {
      .site-header__inner {
        width: calc(100% - 28px);
        min-height: 76px;
        grid-template-columns: 44px minmax(0, 1fr) 44px;
        gap: 14px;
        padding-bottom: 10px;
      }

      .navigation-button {
        width: 44px;
        min-height: 44px;
        padding: 0;
        font-size: 0;
        border-radius: 12px;
        text-align: center;
      }

      .navigation-button--back::after {
        content: "←";
        font-size: 18px;
      }

      .navigation-button--next::after {
        content: "→";
        font-size: 18px;
      }

      .navigation-button--finish::after {
        content: "✓";
      }

      .brief-progress {
        gap: 12px;
      }

      .brief-progress__title {
        margin-bottom: 7px;
        font-size: 14px;
      }

      .brief-progress__count {
        font-size: 14px;
      }

      main {
        width: calc(100% - 32px);
        padding: 64px 0 calc(104px + env(safe-area-inset-bottom));
      }

      h1 {
        font-size: 34px;
      }

      .step-intro {
        margin-top: 16px;
      }

      .field-list {
        gap: 52px;
        margin-top: 64px;
      }

      .option {
        min-height: 58px;
      }

      .step-actions {
        margin-top: 64px;
      }

      .next-step-button {
        width: 100%;
        min-height: 54px;
      }

      .answer-summary {
        gap: 56px;
        margin-top: 72px;
      }
    }

    @media (max-width: 480px) {
      .site-header__inner {
        width: calc(100% - 20px);
        grid-template-columns: 44px minmax(0, 1fr) 44px;
        gap: 8px;
      }

      .brief-progress {
        gap: 8px;
      }

      .brief-progress__title,
      .brief-progress__count {
        font-size: 13px;
      }

      main {
        width: calc(100% - 24px);
        padding-top: 48px;
      }

      h1 {
        font-size: clamp(30px, 9vw, 36px);
      }

      .step-intro {
        font-size: 15px;
      }

      .field-list {
        gap: 40px;
        margin-top: 48px;
      }

      .form-field {
        gap: 12px;
      }

      .option {
        grid-template-columns: 24px minmax(0, 1fr);
        min-height: 56px;
        padding: 0 14px;
      }

      .option__mark {
        width: 20px;
        height: 20px;
      }

      .option__text {
        padding: 15px 0;
        overflow-wrap: anywhere;
      }

      .completion-actions {
        display: grid;
      }

      .action-button {
        width: 100%;
        min-height: 52px;
      }
    }

    @media (pointer: coarse) {
      .navigation-button,
      .next-step-button,
      .action-button {
        min-height: 48px;
      }

      .option {
        min-height: 52px;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }

      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }