.stc-body {
    margin: 0;
    background: #f8fafc;
    color: #0f172a;
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
}

.stc-shell {
    width: min(920px, calc(100% - 28px));
    margin: 0 auto;
    padding:
        max(26px, env(safe-area-inset-top))
        0
        max(40px, env(safe-area-inset-bottom));
}

.stc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}

.stc-brand {
    font-weight: 900;
    font-size: 21px;
    color: #0f172a;
    text-decoration: none;
}

.stc-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.stc-nav a {
    color: #334155;
    font-weight: 700;
}

.stc-card {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 18px;
    padding: 28px;
    box-shadow:
        0 14px 45px
        rgba(15,23,42,.06);
}

.stc-card h1 {
    margin-top: 0;
}

.stc-card h2 {
    margin-top: 30px;
}

.stc-card p,
.stc-card li {
    line-height: 1.7;
    color: #334155;
}

.stc-field {
    display: grid;
    gap: 6px;
    margin-top: 16px;
}

.stc-field label {
    font-weight: 800;
}

.stc-field input,
.stc-field textarea {
    width: 100%;
    min-height: 46px;
    border: 1px solid #cbd5e1;
    border-radius: 11px;
    padding: 11px 12px;
    font-size: 16px;
}

.stc-field textarea {
    min-height: 120px;
}

.stc-button {
    margin-top: 18px;
    width: 100%;
    min-height: 48px;
    border: 0;
    border-radius: 11px;
    background: #0f172a;
    color: #fff;
    font-weight: 850;
    cursor: pointer;
}

.stc-success,
.stc-error {
    padding: 12px 14px;
    border-radius: 11px;
    margin-bottom: 16px;
}

.stc-success {
    background: #ecfdf5;
    color: #065f46;
}

.stc-error {
    background: #fef2f2;
    color: #991b1b;
}

.stc-footer {
    margin-top: 20px;
    text-align: center;
    color: #64748b;
    font-size: 14px;
}

@media(max-width: 640px) {
    .stc-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .stc-card {
        padding: 18px;
        border-radius: 14px;
    }
}