:root {
      --bg:        oklch(0.985 0.004 240);
      --surface:   oklch(1 0 0);
      --surface-2: oklch(0.975 0.005 240);
      --hairline:  oklch(0.91 0.008 240);
      --line:      oklch(0.85 0.010 240);
      --ink:       oklch(0.22 0.020 245);
      --ink-2:     oklch(0.42 0.018 245);
      --mute:      oklch(0.56 0.014 245);
      --faint:     oklch(0.72 0.012 245);

      --blue:      oklch(0.50 0.12 248);
      --blue-deep: oklch(0.38 0.13 250);
      --blue-soft: oklch(0.96 0.025 248);
      --green:     oklch(0.55 0.10 165);
      --green-soft:oklch(0.96 0.025 165);
      --red:       oklch(0.55 0.18 25);

      --r-sm: 8px;  --r-md: 12px;  --r-lg: 18px;  --r-xl: 24px;

      --shadow-sm: 0 1px 2px rgba(15,20,30,0.04), 0 1px 0 rgba(15,20,30,0.03);
      --shadow-md: 0 1px 2px rgba(15,20,30,0.04), 0 8px 24px -8px rgba(15,20,30,0.10);
      --shadow-lg: 0 1px 2px rgba(15,20,30,0.04), 0 30px 60px -24px rgba(15,20,30,0.18);

      --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
      --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

      --gutter: clamp(20px, 5vw, 80px);
    }

    *, *::before, *::after { box-sizing: border-box; }
    html, body { margin: 0; padding: 0; }
    body {
      font-family: var(--font-sans); color: var(--ink); background: var(--bg);
      font-feature-settings: "ss01", "cv11";
      -webkit-font-smoothing: antialiased;
      line-height: 1.5;
    }
    img, svg { display: block; }
    button { font: inherit; cursor: pointer; }
    h1, h2, h3, h4 { margin: 0; letter-spacing: -0.02em; font-weight: 600; line-height: 1.1; }
    p { margin: 0; }
    a { color: inherit; text-decoration: none; }

    .container { max-width: 1100px; margin: 0 auto; padding: 0 var(--gutter); }

    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
      text-transform: uppercase; color: var(--mute);
    }
    .eyebrow::before {
      content: ""; width: 6px; height: 6px; border-radius: 50%;
      background: var(--green);
      box-shadow: 0 0 0 4px var(--green-soft);
    }

    .btn {
      display: inline-flex; align-items: center; gap: 8px; padding: 13px 20px;
      border-radius: 10px; border: 1px solid transparent;
      font-size: 14px; font-weight: 500; letter-spacing: -0.005em;
      transition: transform 80ms ease, background 120ms ease;
    }
    .btn:active { transform: translateY(1px); }
    .btn--primary { background: var(--ink); color: #fff; }
    .btn--primary:hover { background: var(--blue-deep); }
    .btn--ghost { background: var(--surface); color: var(--ink); border-color: var(--hairline); }
    .btn--ghost:hover { background: var(--surface-2); }
    .btn--lg { padding: 15px 22px; font-size: 15px; }

    /* ── Nav ──────────────────────────────────────────────────────── */
    .nav {
      position: sticky; top: 0; z-index: 50;
      background: color-mix(in oklch, var(--bg) 88%, transparent);
      backdrop-filter: saturate(140%) blur(14px);
      border-bottom: 1px solid var(--hairline);
    }
    .nav__inner {
      display: flex; align-items: center; justify-content: space-between;
      padding: 16px 0;
    }
    .logo { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.02em; }
    .logo__mark {
      width: 28px; height: 28px; border-radius: 8px;
      background: linear-gradient(140deg, var(--blue) 0%, var(--green) 100%);
      position: relative;
    }
    .logo__mark::after { content: ""; position: absolute; inset: 6px; border-radius: 4px; background: var(--bg); }
    .logo__mark::before {
      content: ""; position: absolute; top: 50%; left: 50%; width: 8px; height: 8px;
      transform: translate(-50%, -50%); border-radius: 2px; background: var(--ink);
    }
    .nav__back { font-size: 14px; color: var(--ink-2); display: inline-flex; gap: 8px; align-items: center; }
    .nav__back:hover { color: var(--ink); }

    /* ── Page header ─────────────────────────────────────────────── */
    .page-head { padding: clamp(48px, 7vw, 80px) 0 clamp(24px, 3vw, 36px); }
    .page-head h1 {
      font-size: clamp(36px, 4.6vw, 56px); line-height: 1.05;
      max-width: 22ch; margin: 18px 0 18px;
    }
    .page-head h1 .accent { color: var(--blue-deep); }
    .page-head p { font-size: clamp(15px, 1.3vw, 17px); color: var(--ink-2); max-width: 60ch; line-height: 1.55; }

    /* ── Form layout ─────────────────────────────────────────────── */
    .form-wrap {
      padding-bottom: clamp(72px, 10vw, 120px);
    }
    .form-grid {
      display: grid; grid-template-columns: 1fr 320px; gap: clamp(28px, 4vw, 56px);
      align-items: start;
    }
    form.partner-form {
      background: var(--surface); border: 1px solid var(--hairline);
      border-radius: var(--r-xl); padding: clamp(24px, 3vw, 40px);
      display: flex; flex-direction: column; gap: 32px;
    }
    .fieldset {
      display: flex; flex-direction: column; gap: 18px;
    }
    .fieldset + .fieldset { border-top: 1px solid var(--hairline); padding-top: 32px; }
    .fieldset__head {
      display: flex; align-items: baseline; gap: 12px;
    }
    .fieldset__num {
      font-family: var(--font-mono); font-size: 12px; color: var(--mute); letter-spacing: 0.06em;
    }
    .fieldset h2 { font-size: 20px; }
    .fieldset__hint { font-size: 13px; color: var(--mute); margin-top: 4px; }

    .row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    @media (max-width: 600px) { .row { grid-template-columns: 1fr; } }

    label.field {
      display: flex; flex-direction: column; gap: 6px;
      font-size: 13px;
    }
    .field__label {
      font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em;
      text-transform: uppercase; color: var(--mute);
    }
    .field__label .req { color: var(--red); margin-left: 2px; }
    .input, .textarea, .select {
      font: inherit; font-size: 14px; color: var(--ink);
      padding: 12px 14px; border: 1px solid var(--hairline); border-radius: var(--r-md);
      background: var(--bg); outline: none;
      transition: border-color 120ms ease, box-shadow 120ms ease;
      width: 100%;
    }
    .input:focus, .textarea:focus, .select:focus {
      border-color: var(--ink); background: var(--surface);
      box-shadow: 0 0 0 4px color-mix(in oklch, var(--ink) 8%, transparent);
    }
    .textarea { min-height: 110px; resize: vertical; line-height: 1.55; font-family: inherit; }
    .select {
      appearance: none;
      background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'><path d='M1 1l5 5 5-5' stroke='%2358637a' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
      background-repeat: no-repeat; background-position: right 14px center;
      padding-right: 36px;
    }

    /* Chip / pill selectors */
    .chips { display: flex; flex-wrap: wrap; gap: 8px; }
    .chip {
      position: relative;
      padding: 8px 14px; border-radius: 999px; font-size: 13px;
      background: var(--surface); color: var(--ink-2); border: 1px solid var(--hairline);
      cursor: pointer; user-select: none;
      transition: background 120ms ease, color 120ms ease, border-color 120ms ease;
    }
    .chip:hover { background: var(--surface-2); }
    .chip input { position: absolute; opacity: 0; pointer-events: none; }
    .chip:has(input:focus-visible) {
      box-shadow: 0 0 0 4px color-mix(in oklch, var(--ink) 10%, transparent);
      border-color: var(--ink);
    }
    .chip:has(input:checked) {
      background: var(--ink); color: #fff; border-color: var(--ink);
    }
    .chip--radio:has(input:checked) {
      background: var(--ink); color: #fff; border-color: var(--ink);
    }

    /* Big tile selectors */
    .tiles { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
    @media (max-width: 600px) { .tiles { grid-template-columns: 1fr 1fr; } }
    .tile {
      position: relative;
      padding: 14px 14px; border: 1px solid var(--hairline); border-radius: var(--r-md);
      background: var(--surface); cursor: pointer; user-select: none;
      display: flex; flex-direction: column; gap: 4px;
      transition: border-color 120ms ease, background 120ms ease;
    }
    .tile:hover { background: var(--surface-2); }
    .tile input { position: absolute; opacity: 0; pointer-events: none; }
    .tile:has(input:focus-visible) {
      box-shadow: 0 0 0 4px color-mix(in oklch, var(--ink) 10%, transparent);
      border-color: var(--ink);
    }
    .tile__title { font-size: 14px; font-weight: 500; color: var(--ink); }
    .tile__hint { font-size: 12px; color: var(--mute); }
    .tile:has(input:checked) {
      border-color: var(--ink); background: color-mix(in oklch, var(--ink) 5%, var(--surface));
    }
    .tile:has(input:checked)::after {
      content: ""; position: absolute; top: 12px; right: 12px;
      width: 14px; height: 14px; border-radius: 50%;
      background: var(--ink);
      box-shadow: inset 0 0 0 3px var(--surface), 0 0 0 1px var(--ink);
    }

    /* Submit row */
    .submit-row {
      display: flex; flex-direction: column; gap: 14px;
      border-top: 1px solid var(--hairline); padding-top: 28px;
    }
    .submit-row__actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
    .submit-row__note { font-size: 12px; color: var(--mute); font-family: var(--font-mono); letter-spacing: 0.02em; }

    /* Sidebar */
    aside.sidebar {
      position: sticky; top: 90px;
      display: flex; flex-direction: column; gap: 16px;
    }
    .side-card {
      background: var(--surface); border: 1px solid var(--hairline);
      border-radius: var(--r-lg); padding: 22px;
    }
    .side-card h3 { font-size: 14px; margin-bottom: 12px; }
    .side-card ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
    .side-card li {
      display: grid; grid-template-columns: 18px 1fr; gap: 10px;
      font-size: 13px; color: var(--ink-2); line-height: 1.5;
    }
    .side-card li svg { color: var(--green); margin-top: 3px; }
    .side-card--dark {
      background: var(--ink); color: color-mix(in oklch, var(--bg) 75%, transparent);
      border-color: transparent;
    }
    .side-card--dark h3 { color: var(--bg); }
    .side-card--dark .step { color: color-mix(in oklch, var(--bg) 75%, transparent); }
    .timeline { display: flex; flex-direction: column; gap: 0; }
    .timeline__row {
      display: grid; grid-template-columns: 28px 1fr; gap: 12px;
      padding: 12px 0; position: relative;
    }
    .timeline__row + .timeline__row { border-top: 1px dashed color-mix(in oklch, var(--bg) 14%, transparent); }
    .timeline__dot {
      width: 22px; height: 22px; border-radius: 50%;
      background: color-mix(in oklch, var(--bg) 12%, transparent);
      color: var(--bg); display: grid; place-items: center;
      font-family: var(--font-mono); font-size: 11px;
    }
    .timeline__title { color: var(--bg); font-size: 13px; font-weight: 500; }
    .timeline__hint { font-size: 12px; color: color-mix(in oklch, var(--bg) 55%, transparent); margin-top: 2px; }

    /* Footer */
    footer {
      border-top: 1px solid var(--hairline); padding: 32px 0 40px;
      color: var(--mute); font-size: 13px;
    }
    .footer__row {
      display: flex; justify-content: space-between; align-items: center; gap: 20px;
      flex-wrap: wrap;
    }
    .footer__legal { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; }

    @media (max-width: 900px) {
      .form-grid { grid-template-columns: 1fr; }
      aside.sidebar { position: static; order: -1; }
    }