.prototype-badge {
    margin-left: auto;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #fff;
    padding: 8px 12px;
    color: #4f555e;
    font-size: 12px;
    font-weight: 650;
}

.prototype-page {
    display: grid;
    grid-template-columns:
        minmax(0, 0.82fr)
        minmax(520px, 1.18fr);
    gap: 24px;
    align-items: start;
    padding-top: 32px;
    padding-bottom: 90px;
}

.prototype-intro {
    position: sticky;
    top: 24px;
    padding: 56px 40px;
}

.prototype-intro h1 {
    max-width: 660px;
    margin: 18px 0 22px;
    font-size: clamp(48px, 6vw, 82px);
    line-height: 0.98;
    letter-spacing: -0.06em;
}

.prototype-intro > p {
    max-width: 620px;
    margin: 0;
    color: var(--muted);
    font-size: 18px;
    line-height: 1.65;
}

.prototype-steps {
    display: grid;
    gap: 0;
    margin: 42px 0 0;
    padding: 0;
    list-style: none;
}

.prototype-steps li {
    display: grid;
    grid-template-columns: 38px 1fr;
    gap: 14px;
    border-top: 1px solid var(--border);
    padding: 18px 0;
}

.prototype-steps li > span {
    color: var(--quiet);
    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        monospace;
    font-size: 11px;
}

.prototype-steps strong {
    font-size: 14px;
}

.prototype-steps p {
    margin: 5px 0 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.prototype-security-note {
    margin-top: 26px;
    border-radius: 16px;
    background: var(--ink);
    color: #fff;
    padding: 22px;
}

.prototype-security-note strong {
    font-size: 13px;
}

.prototype-security-note p {
    margin: 8px 0 0;
    color: #c8cdd4;
    font-size: 13px;
    line-height: 1.55;
}

.prototype-card,
.result-card {
    border: 1px solid #e1e4e8;
    border-radius: 24px;
    background: #fff;
    box-shadow: var(--shadow);
}

.prototype-card {
    padding: clamp(28px, 4vw, 52px);
}

.prototype-card__header {
    margin-bottom: 34px;
}

.prototype-card__header h2 {
    margin: 10px 0 10px;
    font-size: 34px;
    letter-spacing: -0.045em;
}

.prototype-card__header p {
    max-width: 620px;
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
}

.form-alert {
    margin-bottom: 24px;
    border: 1px solid #d9baba;
    border-radius: 14px;
    background: #fff7f7;
    padding: 14px;
    color: #7b2929;
    font-size: 13px;
    font-weight: 650;
}

.form-field {
    display: grid;
    gap: 8px;
    margin-bottom: 20px;
}

.form-field label,
.link-box label {
    font-size: 13px;
    font-weight: 700;
}

.form-field input,
.link-box input {
    width: 100%;
    min-height: 50px;
    border: 1px solid #d7dbe1;
    border-radius: 13px;
    background: #fff;
    color: var(--ink);
    padding: 0 14px;
    font: inherit;
    outline: none;
}

.form-field input[type="file"] {
    padding: 11px 12px;
    color: var(--muted);
    font-size: 13px;
}

.form-field input[type="file"]::file-selector-button {
    margin-right: 12px;
    border: 0;
    border-radius: 9px;
    background: var(--ink);
    color: #fff;
    padding: 8px 11px;
    font: inherit;
    font-weight: 650;
}

.form-field input:focus,
.link-box input:focus {
    border-color: #777d87;
    box-shadow:
        0 0 0 3px
        rgba(119, 125, 135, 0.16);
}

.field-hint,
.field-error {
    font-size: 12px;
    line-height: 1.45;
}

.field-hint {
    color: var(--quiet);
}

.field-error {
    color: #9d2f2f;
}

.field-error--standalone {
    display: block;
    margin-top: -10px;
    margin-bottom: 18px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.form-divider {
    margin: 32px 0 20px;
    border-top: 1px solid var(--border-soft);
    padding-top: 24px;
    color: var(--quiet);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.signing-method {
    display: grid;
    grid-template-columns: 54px 1fr;
    gap: 14px;
    align-items: center;
    margin: 10px 0 24px;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: #f8f9fa;
    padding: 15px;
}

.signing-method__mark {
    width: 54px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--ink);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
}

.signing-method strong {
    font-size: 14px;
}

.signing-method p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 12px;
}

.consent-field {
    display: grid;
    grid-template-columns: 20px 1fr;
    gap: 10px;
    align-items: start;
    margin-bottom: 20px;
    color: #4f555e;
    font-size: 13px;
    line-height: 1.5;
}

.consent-field input {
    width: 18px;
    height: 18px;
    margin: 1px 0 0;
    accent-color: var(--ink);
}

.prototype-submit {
    width: 100%;
    border: 0;
    cursor: pointer;
}

.form-footnote {
    margin: 14px 0 0;
    color: var(--quiet);
    font-size: 11px;
    line-height: 1.5;
    text-align: center;
}

.result-page {
    min-height: calc(100vh - 76px);
    display: grid;
    place-items: center;
    padding-top: 40px;
    padding-bottom: 70px;
}

.result-card {
    width: min(820px, 100%);
    padding: clamp(30px, 6vw, 66px);
}

.result-mark {
    width: 54px;
    height: 54px;
    margin-bottom: 24px;
    display: grid;
    place-items: center;
    border-radius: 15px;
    background: var(--ink);
    color: #fff;
    font-size: 22px;
    font-weight: 800;
}

.result-card h1 {
    margin: 16px 0 16px;
    font-size: clamp(42px, 6vw, 70px);
    line-height: 0.98;
    letter-spacing: -0.06em;
}

.result-lead {
    max-width: 650px;
    margin: 0;
    color: var(--muted);
    font-size: 17px;
    line-height: 1.6;
}

.result-details {
    margin: 34px 0;
    border-top: 1px solid var(--border-soft);
}

.result-details div {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 20px;
    border-bottom: 1px solid var(--border-soft);
    padding: 14px 0;
}

.result-details dt {
    color: var(--quiet);
    font-size: 12px;
}

.result-details dd {
    margin: 0;
    font-size: 13px;
    font-weight: 650;
    overflow-wrap: anywhere;
}

.link-box {
    display: grid;
    gap: 9px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #f8f9fa;
    padding: 18px;
}

.link-box__row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
}

.link-box input {
    min-width: 0;
    background: #fff;
    font-family:
        ui-monospace,
        SFMono-Regular,
        Menlo,
        monospace;
    font-size: 11px;
}

.link-box .button {
    min-height: 50px;
    cursor: pointer;
}

.copy-status {
    min-height: 18px;
    margin: 0;
    color: var(--muted);
    font-size: 12px;
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-top: 20px;
}

.capability-warning {
    margin-top: 28px;
    border-left: 3px solid var(--ink);
    background: #f2f4f6;
    padding: 14px 16px;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.55;
}

.capability-warning strong {
    color: var(--ink);
}

@media (max-width: 960px) {
    .prototype-page {
        grid-template-columns: 1fr;
    }

    .prototype-intro {
        position: static;
        padding: 42px 24px 10px;
    }
}

@media (max-width: 680px) {
    .prototype-badge {
        display: none;
    }

    .prototype-page {
        padding-top: 12px;
        padding-bottom: 60px;
    }

    .prototype-intro {
        padding-right: 10px;
        padding-left: 10px;
    }

    .prototype-intro h1 {
        font-size: clamp(45px, 14vw, 66px);
    }

    .prototype-card,
    .result-card {
        border-radius: 20px;
    }

    .form-grid,
    .link-box__row {
        grid-template-columns: 1fr;
    }

    .link-box .button,
    .result-actions,
    .result-actions .button {
        width: 100%;
    }

    .result-details div {
        grid-template-columns: 1fr;
        gap: 5px;
    }
}