.stringer-staircase-page {
    --stair-ink: #14231e;
    --stair-brand: #08724e;
    --stair-brand-light: #dff4e9;
    --stair-muted: #62766d;
    --stair-line: #d8e8de;
    --stair-surface: #ffffff;
}

.stair-diagrams {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
    margin-bottom: 28px;
}

.stair-diagram,
.stair-card,
.stair-live-drawing,
.stair-content {
    margin: 0;
    border: 1px solid var(--stair-line);
    border-radius: 24px;
    background: var(--stair-surface);
    box-shadow: 0 18px 42px rgba(22, 61, 44, 0.05);
}

.stair-diagram {
    padding: 20px;
}

.stair-diagram img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--stair-line);
    border-radius: 16px;
    background: #f7fbf8;
}

.stair-diagram figcaption,
.stair-live-drawing figcaption {
    margin-top: 15px;
    color: var(--stair-muted);
    font-size: 1rem;
    line-height: 1.55;
}

.stair-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap: 28px;
    align-items: start;
    margin-bottom: 28px;
}

.stair-card {
    padding: 30px;
}

.stair-form-section + .stair-form-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--stair-line);
}

.stair-form-section h2,
.stair-result h2,
.stair-content h2,
.stair-faq h2 {
    margin: 0;
    color: var(--stair-ink);
    font-size: clamp(1.45rem, 2vw, 1.9rem);
    line-height: 1.15;
}

.stair-fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
    margin-top: 20px;
}

.stair-field {
    display: grid;
    gap: 8px;
}

.stair-field label,
.stair-action-export label {
    color: #385247;
    font-size: 0.96rem;
    font-weight: 750;
}

.stair-field input,
.stair-action-export select {
    width: 100%;
    min-height: 52px;
    box-sizing: border-box;
    border: 1px solid #b9d5c7;
    border-radius: 12px;
    outline: 0;
    color: var(--stair-ink);
    background: #fff;
    font: inherit;
    font-size: 1.08rem;
    padding: 11px 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.stair-field input:focus,
.stair-action-export select:focus {
    border-color: var(--stair-brand);
    box-shadow: 0 0 0 4px rgba(8, 114, 78, 0.12);
}

.stair-submit,
.stair-action-export button {
    border: 0;
    border-radius: 13px;
    color: #fff;
    background: linear-gradient(135deg, #16ab77, #08724e);
    box-shadow: 0 12px 22px rgba(8, 114, 78, 0.2);
    font: inherit;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stair-submit:hover,
.stair-action-export button:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 27px rgba(8, 114, 78, 0.25);
}

.stair-submit {
    width: 100%;
    min-height: 58px;
    margin-top: 30px;
    font-size: 1.08rem;
}

.stair-result {
    position: sticky;
    top: 22px;
}

.stair-result > p {
    margin: 21px 0 0;
    color: var(--stair-muted);
    font-size: 0.93rem;
    line-height: 1.55;
}

.stair-result-list {
    display: grid;
    margin: 18px 0 0;
}

.stair-result-list > div {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--stair-line);
}

.stair-result-list dt {
    color: var(--stair-muted);
}

.stair-result-list dd {
    margin: 0;
    color: var(--stair-ink);
    font-weight: 800;
    text-align: right;
}

.stair-comfort-note {
    margin: 18px 0 0;
    padding: 14px;
    border-radius: 12px;
    color: #315548;
    background: #edf7f0;
    line-height: 1.45;
}

.stair-live-drawing {
    padding: 34px;
    margin-bottom: 30px;
}

.stair-live-drawing__heading,
.stair-calculation-actions__heading {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
    gap: 28px;
    align-items: start;
    margin-bottom: 27px;
}

.stair-eyebrow {
    margin: 0 0 10px;
    color: var(--stair-brand);
    font-size: 0.83rem;
    font-weight: 850;
    letter-spacing: 0.12em;
    line-height: 1.3;
    text-transform: uppercase;
}

.stair-live-drawing__heading h2,
.stair-calculation-actions h2 {
    margin: 0;
    color: var(--stair-ink);
    font-size: clamp(2rem, 3.5vw, 3rem);
    line-height: 1.05;
}

.stair-live-drawing__heading > p,
.stair-calculation-actions__heading > p {
    margin: 5px 0 0;
    color: var(--stair-muted);
    font-size: 1.1rem;
    line-height: 1.48;
}

.stair-live-drawing__figure {
    margin: 0;
    padding: 18px;
    border: 1px solid var(--stair-line);
    border-radius: 20px;
    background: #fff;
}

.stringer-stair-svg {
    display: block;
    width: 100%;
    height: auto;
}

.stair-live-drawing__metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.stair-live-drawing__metrics > div {
    min-height: 74px;
    box-sizing: border-box;
    padding: 14px 16px;
    border-radius: 14px;
    background: #edf7f0;
}

.stair-live-drawing__metrics span {
    display: block;
    color: var(--stair-muted);
    font-size: 0.86rem;
}

.stair-live-drawing__metrics strong {
    display: block;
    margin-top: 4px;
    color: var(--stair-brand);
    font-size: 1.08rem;
}

.stair-calculation-actions {
    padding: 42px;
    margin: 30px 0 64px;
    border: 1px solid #1c4d3b;
    border-radius: 28px;
    color: #fff;
    background: #102f24;
    box-shadow: 0 18px 44px rgba(12, 54, 39, 0.16);
}

.stair-calculation-actions .stair-eyebrow {
    color: #62dfb2;
}

.stair-calculation-actions h2 {
    color: #fff;
}

.stair-calculation-actions__heading > p {
    color: #c6ddd3;
}

.stair-calculation-actions__grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.stair-action-button,
.stair-action-export {
    display: flex;
    min-height: 112px;
    box-sizing: border-box;
    border: 1px solid rgba(211, 237, 224, 0.34);
    border-radius: 16px;
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.stair-action-button {
    align-items: center;
    gap: 16px;
    padding: 19px 22px;
    text-align: left;
    font: inherit;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.2s ease;
}

.stair-action-button:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-2px);
}

.stair-action-button:first-child {
    border-color: #13bf85;
    background: linear-gradient(135deg, #14ab78, #08724e);
}

.stair-action-button__icon {
    display: grid;
    flex: 0 0 44px;
    width: 44px;
    height: 44px;
    place-items: center;
    border-radius: 50%;
    color: #08724e;
    background: #dff5e9;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.stair-action-button:first-child .stair-action-button__icon {
    color: #fff;
    background: rgba(255, 255, 255, 0.16);
}

.stair-action-button strong,
.stair-action-button small {
    display: block;
}

.stair-action-button strong {
    font-size: 1.08rem;
}

.stair-action-button small {
    margin-top: 4px;
    color: #c6ddd3;
    font-size: 0.9rem;
}

.stair-action-export {
    display: grid;
    gap: 10px;
    padding: 16px 18px;
}

.stair-action-export label {
    color: #e8f5ee;
}

.stair-action-export > span {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
}

.stair-action-export select {
    min-height: 47px;
}

.stair-action-export button {
    min-width: 112px;
    min-height: 47px;
    padding: 0 18px;
}

.stair-calculation-actions__notice {
    min-height: 1.4em;
    margin: 16px 0 0;
    color: #9be6c4;
}

.stair-content {
    padding: 38px;
}

.stair-content__intro {
    max-width: 800px;
}

.stair-content__intro > p:last-child {
    margin: 16px 0 0;
    color: var(--stair-muted);
    font-size: 1.08rem;
    line-height: 1.62;
}

.stair-content__cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
    margin-top: 28px;
}

.stair-content__cards article {
    padding: 22px;
    border: 1px solid var(--stair-line);
    border-radius: 16px;
    background: #f9fcfa;
}

.stair-content__cards h3 {
    margin: 0;
    color: var(--stair-brand);
    font-size: 1.14rem;
}

.stair-content__cards p {
    margin: 10px 0 0;
    color: var(--stair-muted);
    line-height: 1.55;
}

.stair-content__section {
    margin-top: 34px;
    padding-top: 32px;
    border-top: 1px solid var(--stair-line);
}

.stair-content__section h2 {
    margin: 0;
    color: var(--stair-ink);
    font-size: clamp(1.55rem, 2.3vw, 2rem);
    line-height: 1.15;
}

.stair-content__section p {
    max-width: 900px;
    margin: 15px 0 0;
    color: var(--stair-muted);
    font-size: 1.04rem;
    line-height: 1.64;
}

.stair-faq {
    margin-top: 38px;
}

.stair-faq details {
    padding: 16px 0;
    border-bottom: 1px solid var(--stair-line);
}

.stair-faq summary {
    color: var(--stair-ink);
    font-weight: 800;
    cursor: pointer;
}

.stair-faq p {
    margin: 11px 0 0;
    color: var(--stair-muted);
    line-height: 1.58;
}

@media (max-width: 900px) {
    .stair-layout,
    .stair-live-drawing__heading,
    .stair-calculation-actions__heading {
        grid-template-columns: 1fr;
    }

    .stair-result {
        position: static;
    }

    .stair-live-drawing__metrics,
    .stair-content__cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .stair-diagrams,
    .stair-fields,
    .stair-calculation-actions__grid,
    .stair-live-drawing__metrics,
    .stair-content__cards {
        grid-template-columns: 1fr;
    }

    .stair-card,
    .stair-live-drawing,
    .stair-content,
    .stair-calculation-actions {
        padding: 22px;
        border-radius: 20px;
    }

    .stair-diagram,
    .stair-live-drawing__figure {
        padding: 12px;
    }

    .stair-live-drawing__heading h2,
    .stair-calculation-actions h2 {
        font-size: 2rem;
    }

    .stair-action-export > span {
        grid-template-columns: 1fr;
    }

    .stair-action-export button {
        width: 100%;
    }
}