:root {
    --dp-yellow: #ffcc00;
    --dp-black: #111111;
    --dp-white: #ffffff;
    --dp-gray-100: #f5f5f0;
    --dp-gray-200: #ebe9e2;
    --dp-gray-300: #d4d0c8;
    --dp-gray-500: #6a6963;
    --verifier-soft: #eaf3ff;
    --verifier-strong: #2f5f9f;
    --issuer-soft: #eef7e8;
    --issuer-strong: #3d7a3b;
    --dp-shadow: 0 24px 60px rgba(17, 17, 17, 0.12);
    --dp-radius-xl: 28px;
    --dp-radius-lg: 20px;
    --dp-radius-md: 14px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    color: var(--dp-black);
    background:
        radial-gradient(circle at top left, rgba(255, 204, 0, 0.28), transparent 32%),
        linear-gradient(180deg, #fffdf7 0%, var(--dp-gray-100) 100%);
    min-height: 100vh;
}

a {
    color: inherit;
}

.page-shell {
    max-width: 1120px;
    margin: 0 auto;
    padding: 56px 20px 72px;
}

.page-hero {
    margin-bottom: 28px;
}

.page-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    padding: 7px 14px;
    border-radius: 999px;
    background: var(--dp-yellow);
    color: var(--dp-black);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.page-kicker.verifier {
    background: var(--verifier-soft);
    color: var(--verifier-strong);
}

.page-kicker.issuer {
    background: var(--issuer-soft);
    color: var(--issuer-strong);
}

.page-title {
    margin: 0 0 14px;
    font-size: clamp(34px, 5vw, 56px);
    line-height: 1.02;
}

.page-subtitle {
    max-width: 760px;
    margin: 0;
    font-size: 18px;
    line-height: 1.6;
    color: var(--dp-gray-500);
}

.content-card {
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid rgba(17, 17, 17, 0.08);
    border-radius: var(--dp-radius-xl);
    box-shadow: var(--dp-shadow);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    color: var(--dp-black);
    text-decoration: none;
    font-weight: 700;
}

.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
    margin-top: 32px;
}

.use-case-card {
    display: flex;
    flex-direction: column;
    min-height: 290px;
    padding: 28px;
}

.use-case-card.future {
    background: rgba(255, 255, 255, 0.72);
    border: 1px dashed var(--dp-gray-300);
}

.use-case-badge {
    align-self: flex-start;
    margin-bottom: 18px;
    padding: 7px 11px;
    border-radius: 999px;
    background: var(--dp-gray-200);
    color: var(--dp-black);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.use-case-badge.verifier {
    background: var(--verifier-soft);
    color: var(--verifier-strong);
}

.use-case-badge.issuer {
    background: var(--issuer-soft);
    color: var(--issuer-strong);
}

.use-case-badge.planned {
    background: var(--dp-gray-300);
    color: var(--dp-black);
}

.use-case-card h2 {
    margin: 0 0 12px;
    font-size: 24px;
}

.use-case-card p {
    margin: 0 0 20px;
    color: var(--dp-gray-500);
    line-height: 1.65;
    flex-grow: 1;
}

.button-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.button-primary,
.button-secondary,
.button-disabled,
button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 20px;
    border-radius: 999px;
    border: none;
    text-decoration: none;
    font-weight: 700;
    font-size: 15px;
}

.button-primary,
button {
    background: var(--dp-yellow);
    color: var(--dp-black);
    cursor: pointer;
}

.button-secondary {
    background: var(--dp-yellow);
    color: var(--dp-black);
}

.button-disabled {
    background: var(--dp-gray-300);
    color: var(--dp-gray-500);
    cursor: not-allowed;
}

button:disabled {
    background: var(--dp-gray-300);
    color: var(--dp-gray-500);
    cursor: not-allowed;
}

.workflow-card {
    padding: 34px;
}

.panel {
    margin-top: 24px;
    padding: 22px;
    border-radius: var(--dp-radius-lg);
    background: var(--dp-gray-100);
    border: 1px solid var(--dp-gray-200);
}

.panel.info {
    background: linear-gradient(180deg, #fff9db, #fffdf3);
    border-color: rgba(255, 204, 0, 0.7);
}

.implementation-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.panel-label {
    margin: 0 0 8px;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dp-gray-500);
}

.implementation-switch {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 220px;
}

.implementation-switch label {
    font-size: 13px;
    font-weight: 700;
    color: var(--dp-gray-500);
}

.implementation-switch select {
    min-height: 48px;
    padding: 0 16px;
    border: 1px solid var(--dp-gray-300);
    border-radius: 999px;
    background: var(--dp-white);
    color: var(--dp-black);
    font: inherit;
    font-weight: 700;
}

.panel.role-verifier {
    background: linear-gradient(180deg, #f8fbff, var(--verifier-soft));
    border-color: rgba(47, 95, 159, 0.24);
}

.panel.role-issuer {
    background: linear-gradient(180deg, #fbfdf8, var(--issuer-soft));
    border-color: rgba(61, 122, 59, 0.24);
}

.panel.success {
    background: #f6f7f2;
    border-color: #cfd4c3;
}

.panel.error {
    background: #fff1ef;
    border-color: #efb8b0;
    color: #8a2b1d;
}

.hidden {
    display: none;
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.section-index {
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--dp-black);
    color: var(--dp-yellow);
    font-weight: 800;
}

.muted {
    color: var(--dp-gray-500);
}

.qr-box,
.preview-card,
.address-card {
    background: var(--dp-white);
    border: 1px solid var(--dp-gray-200);
    border-radius: var(--dp-radius-md);
}

.qr-box {
    display: inline-block;
    padding: 16px;
}

.address-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.address-card,
.preview-card {
    padding: 18px;
}

.address-card h2,
.preview-card h3 {
    margin-top: 0;
}

.preview-card p {
    margin: 0 0 10px;
    line-height: 1.55;
}

.preview-card p:last-child {
    margin-bottom: 0;
}

.status-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.spinner {
    width: 22px;
    height: 22px;
    border: 3px solid var(--dp-gray-300);
    border-top-color: var(--dp-black);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.address-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 18px;
}

.link-block {
    word-break: break-all;
    color: var(--dp-gray-500);
}

@media (max-width: 720px) {
    .page-shell {
        padding-top: 36px;
    }

    .workflow-card,
    .use-case-card {
        padding: 24px;
    }

    .implementation-panel {
        align-items: stretch;
        flex-direction: column;
    }

    .implementation-switch {
        min-width: 0;
        width: 100%;
    }
}