.smtp-tester-page {
    --smtp-ink: #132019;
    --smtp-text: #33463a;
    --smtp-muted: #5f6f65;
    --smtp-line: #dbe8d7;
    --smtp-soft: #f7fbf5;
    --smtp-mist: #eef7ea;
    --smtp-accent: #2f7825;
    --smtp-green: var(--primary-color, #7ed957);
    --smtp-green-dark: var(--secondary-color, #4a9c2d);
    min-height: 100vh;
    padding: 10rem 0 4.5rem;
    background: linear-gradient(180deg, #ffffff 0%, var(--smtp-soft) 46%, #ffffff 100%);
    color: var(--smtp-text);
    font-family: "Source Sans 3", "Segoe UI", sans-serif;
}

.smtp-tester-page > .container {
    max-width: 1200px;
}

.smtp-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 2rem;
    align-items: end;
    margin-bottom: 1.5rem;
    padding-bottom: 1.6rem;
    border-bottom: 1px solid var(--smtp-line);
}

.smtp-back-link,
.smtp-kicker {
    display: block;
    color: var(--smtp-accent);
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.smtp-back-link {
    width: fit-content;
    margin-bottom: 0.75rem;
    text-decoration: none;
}

.smtp-kicker {
    margin-bottom: 0.35rem;
}

.smtp-header h1,
.smtp-section h2,
.smtp-faq h2 {
    margin: 0;
    color: var(--smtp-ink);
    font-weight: 900;
    letter-spacing: 0;
}

.smtp-header h1 {
    font-size: clamp(2.3rem, 4vw, 3.3rem);
    line-height: 1.1;
}

.smtp-header p,
.smtp-section p,
.smtp-field p,
.smtp-accuracy-card p {
    color: var(--smtp-muted);
    line-height: 1.7;
}

.smtp-header p {
    max-width: 760px;
    margin: 0.75rem 0 0;
}

.smtp-trust-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.9rem;
}

.smtp-trust-row span,
.smtp-status {
    border: 1px solid rgba(74, 156, 45, 0.18);
    border-radius: 999px;
    background: rgba(126, 217, 87, 0.1);
    color: var(--smtp-accent);
    font-size: 0.72rem;
    font-weight: 800;
}

.smtp-trust-row span {
    padding: 0.34rem 0.68rem;
}

.smtp-accuracy-card,
.smtp-console,
.smtp-check,
.smtp-transcript,
.smtp-section,
.smtp-faq {
    border: 1px solid var(--smtp-line);
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 12px 32px rgba(19, 32, 25, 0.055);
}

.smtp-accuracy-card {
    padding: 1rem 1.1rem;
    background: linear-gradient(135deg, #ffffff, var(--smtp-mist));
}

.smtp-accuracy-card span,
.smtp-transcript h3,
.smtp-check h3 {
    display: block;
    color: var(--smtp-accent);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.smtp-accuracy-card strong {
    display: block;
    margin-top: 0.25rem;
    color: var(--smtp-ink);
    font-size: 1.08rem;
}

.smtp-accuracy-card p {
    margin: 0.45rem 0 0;
    font-size: 0.84rem;
}

.smtp-console {
    padding: 1rem;
}

.smtp-form {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem 1rem;
    padding: 1.1rem;
    border-radius: 16px;
    background: var(--smtp-soft);
}

.smtp-field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.smtp-field.wide,
.smtp-actions {
    grid-column: 1 / -1;
}

.smtp-field label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
    color: var(--smtp-ink);
    font-size: 0.92rem;
    font-weight: 800;
}

.smtp-optional {
    color: var(--smtp-muted);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.smtp-field p {
    margin: 0;
    font-size: 0.82rem;
}

.smtp-field-label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
    color: var(--smtp-ink);
    font-size: 0.92rem;
    font-weight: 800;
}

.smtp-field label.smtp-toggle {
    justify-content: flex-start;
    align-items: center;
    min-height: 46px;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--smtp-line);
    border-radius: 12px;
    background: #fff;
    font-weight: 700;
    cursor: pointer;
}

.smtp-field .smtp-toggle input {
    width: 18px;
    min-height: 0;
    height: 18px;
    margin: 0;
    padding: 0;
    accent-color: var(--smtp-green-dark);
}

.smtp-field p.smtp-provider-tip {
    color: var(--smtp-accent);
    font-weight: 600;
}

.smtp-delivery-note {
    grid-column: 1 / -1;
    margin: 0;
    padding: 0.75rem 0.9rem;
    border: 1px solid #ead7a4;
    border-radius: 12px;
    background: #fff8e8;
    color: #6b4a10;
    font-size: 0.86rem;
    line-height: 1.6;
}

.smtp-field input,
.smtp-field select {
    width: 100%;
    min-height: 46px;
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--smtp-line);
    border-radius: 12px;
    background: #fff;
    color: var(--smtp-ink);
    font: inherit;
}

.smtp-field input:focus,
.smtp-field select:focus {
    border-color: rgba(126, 217, 87, 0.9);
    outline: 0;
    box-shadow: 0 0 0 4px rgba(126, 217, 87, 0.14);
}

.smtp-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    align-items: center;
}

.smtp-submit {
    min-height: 46px;
    padding: 0.75rem 1.2rem;
    border: 0;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--smtp-green), var(--smtp-green-dark));
    color: #10210d;
    font: inherit;
    font-weight: 800;
    cursor: pointer;
}

.smtp-submit:disabled {
    cursor: wait;
    opacity: 0.7;
}

.smtp-message {
    margin: 0;
    color: var(--smtp-accent);
    font-weight: 700;
}

.smtp-results {
    margin-top: 1rem;
}

.smtp-check-list {
    display: grid;
    gap: 0.75rem;
}

.smtp-check,
.smtp-transcript,
.smtp-section,
.smtp-faq {
    padding: 1rem 1.1rem;
}

.smtp-check-top {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
}

.smtp-check h3,
.smtp-transcript h3 {
    margin: 0;
}

.smtp-check strong {
    display: block;
    margin: 0.45rem 0 0.2rem;
    color: var(--smtp-ink);
    font-size: 1.05rem;
}

.smtp-check p,
.smtp-transcript pre {
    margin: 0.35rem 0 0;
    white-space: pre-wrap;
    word-break: break-word;
}

.smtp-status {
    padding: 0.25rem 0.55rem;
    text-transform: uppercase;
}

.smtp-check.status-fail {
    border-color: #f0c7c3;
}

.smtp-check.status-fail .smtp-status {
    border-color: #f0c7c3;
    background: #fff1ef;
    color: #9d2c23;
}

.smtp-check.status-warning .smtp-status,
.smtp-check.status-inconclusive .smtp-status {
    border-color: #ead7a4;
    background: #fff8e8;
    color: #8a5a10;
}

.smtp-check.status-not_tested .smtp-status {
    border-color: var(--smtp-line);
    background: #f4f7f3;
    color: var(--smtp-muted);
}

.smtp-transcript {
    margin-top: 0.75rem;
}

.smtp-transcript pre {
    color: var(--smtp-ink);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.82rem;
}

.smtp-about {
    margin-top: 2.5rem;
}

.smtp-about .smtp-kicker {
    margin-bottom: 0.35rem;
}

.smtp-content-blocks {
    display: grid;
    gap: 2.5rem;
    margin-top: 2.75rem;
}

.smtp-content-blocks h2 {
    margin: 0.2rem 0 0;
    color: var(--smtp-ink);
    font-size: clamp(1.45rem, 2.2vw, 1.85rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.25;
}

.smtp-content-blocks p,
.smtp-steps li,
.smtp-label-list dd {
    color: var(--smtp-muted);
    line-height: 1.7;
}

.smtp-content-blocks > section > p {
    max-width: 72ch;
    margin: 0.7rem 0 0;
}

.smtp-feature-grid,
.smtp-label-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.85rem;
    margin: 1rem 0 0;
}

.smtp-audience-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.smtp-feature-grid article,
.smtp-label-list > div {
    padding: 1rem 1.05rem;
    border: 1px solid var(--smtp-line);
    border-radius: 16px;
    background: #fff;
}

.smtp-feature-grid h3,
.smtp-label-list dt {
    margin: 0 0 0.4rem;
    color: var(--smtp-ink);
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.35;
}

.smtp-feature-grid p,
.smtp-label-list dd {
    margin: 0;
    font-size: 0.92rem;
}

.smtp-steps {
    display: grid;
    gap: 0.7rem;
    margin: 1rem 0 0;
    padding-left: 1.25rem;
}

.smtp-about .smtp-faq {
    margin-top: 2.75rem;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
}

@media (max-width: 980px) {
    .smtp-feature-grid,
    .smtp-label-list,
    .smtp-audience-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 800px) {
    .smtp-tester-page {
        padding-top: 7.5rem;
    }

    .smtp-header,
    .smtp-form {
        grid-template-columns: 1fr;
    }

    .smtp-field.wide,
    .smtp-actions,
    .smtp-delivery-note {
        grid-column: auto;
    }

    .smtp-feature-grid,
    .smtp-label-list,
    .smtp-audience-grid,
    .smtp-port-grid {
        grid-template-columns: 1fr;
    }
}