.triangle-special-page {
    background: #f4f7fb;
}

.triangle-special-page .site-main {
    max-width: 1120px !important;
    padding-top: 1.25rem;
}

.triangle-special-hero {
    padding-bottom: 1.35rem;
}

.triangle-special-calculator {
    margin-top: 1.2rem;
}

.triangle-special-workbench {
    display: grid;
    grid-template-columns: minmax(0, 1.04fr) minmax(370px, 0.96fr);
    overflow: hidden;
    background: #fff;
    border: 1px solid #dbe3ee;
    border-radius: 21px;
    box-shadow: 0 18px 48px rgba(20, 42, 76, 0.09);
}

.triangle-special-form,
.triangle-special-results {
    min-width: 0;
    padding: 1.35rem;
}

.triangle-special-heading {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 0.8rem;
    align-items: center;
    padding-bottom: 0.95rem;
    border-bottom: 1px solid #e2e8f0;
}

.triangle-special-heading__icon {
    width: 50px;
    height: 48px;
    display: grid;
    place-items: center;
    color: #fff;
    background: linear-gradient(145deg, var(--blue), var(--blue-dark));
    border-radius: 13px;
    box-shadow: 0 8px 18px rgba(40, 120, 255, 0.2);
    font-size: 0.88rem;
    font-weight: 700;
}

.triangle-special-heading .section-kicker,
.triangle-special-results__header .section-kicker,
.triangle-special-example .section-kicker {
    margin-bottom: 0.25rem;
}

.triangle-special-heading h2,
.triangle-special-results h2,
.triangle-special-definition h2,
.triangle-special-formulas h2 {
    margin: 0;
    color: var(--ink);
    font-weight: 800;
    letter-spacing: -0.035em;
}

.triangle-special-heading h2 {
    font-size: 1.15rem;
}

.triangle-special-heading p:last-child {
    margin: 0.25rem 0 0;
    color: #6c798c;
    font-size: 0.8rem;
}

.triangle-special-diagram {
    margin: 0.9rem 0 0;
    padding: 0.75rem 0.75rem 0.55rem;
    background: linear-gradient(145deg, #f8fbff, #f2f6fc);
    border: 1px solid #e0e7f1;
    border-radius: 13px;
}

.triangle-special-diagram svg {
    width: 100%;
    max-height: 205px;
    display: block;
}

.triangle-special-diagram__fill {
    fill: rgba(40, 120, 255, 0.07);
}

.triangle-special-diagram__line,
.triangle-special-diagram__right-angle,
.triangle-special-diagram__angle {
    fill: none;
    stroke: #263750;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 2.2;
}

.triangle-special-diagram text {
    fill: #536278;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 600;
}

.triangle-special-diagram .triangle-special-diagram__side {
    fill: var(--blue-dark);
    font-size: 18px;
    font-weight: 800;
}

.triangle-special-diagram figcaption {
    color: #6d7a8d;
    font-size: 0.78rem;
    line-height: 1.5;
    text-align: center;
}

.triangle-known-side {
    margin: 0.9rem 0 0;
    padding: 0;
    border: 0;
}

.triangle-known-side legend {
    margin-bottom: 0.45rem;
    color: #526177;
    font-size: 0.8rem;
    font-weight: 700;
}

.triangle-known-side > div {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.48rem;
}

.triangle-known-side label {
    position: relative;
    cursor: pointer;
}

.triangle-known-side input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
}

.triangle-known-side label > span {
    min-height: 58px;
    display: grid;
    align-content: center;
    justify-items: center;
    gap: 0.08rem;
    padding: 0.5rem;
    color: #536278;
    background: #f8fafc;
    border: 1px solid #d8e0ea;
    border-radius: 10px;
}

.triangle-known-side strong {
    color: #33465f;
    font-size: 0.9rem;
}

.triangle-known-side small {
    color: #768397;
    font-size: 0.76rem;
}

.triangle-known-side input:checked + span {
    color: var(--blue-dark);
    background: #edf4ff;
    border-color: #77a8fb;
    box-shadow: inset 0 0 0 1px #77a8fb;
}

.triangle-known-side input:checked + span strong {
    color: var(--blue-dark);
}

.triangle-known-side input:focus-visible + span {
    outline: 3px solid rgba(40, 120, 255, 0.16);
    outline-offset: 2px;
}

.triangle-length-field {
    display: grid;
    gap: 0.5rem;
    margin-top: 0.85rem;
}

.triangle-length-field > span:first-child {
    display: grid;
    gap: 0.12rem;
}

.triangle-length-field strong {
    color: #3c4c62;
    font-size: 0.82rem;
}

.triangle-length-field small {
    color: #7a8799;
    font-size: 0.76rem;
}

.triangle-length-input {
    min-height: 48px;
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr) auto;
    align-items: stretch;
    overflow: hidden;
    background: #f8fafc;
    border: 1px solid #d4dde9;
    border-radius: 10px;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.triangle-length-input:focus-within {
    background: #fff;
    border-color: #78a8f5;
    box-shadow: 0 0 0 3px rgba(40, 120, 255, 0.1);
}

.triangle-length-input:has(input[aria-invalid="true"]) {
    border-color: #d45e50;
    box-shadow: 0 0 0 3px rgba(212, 94, 80, 0.09);
}

.triangle-length-input > span {
    display: grid;
    place-items: center;
    color: var(--blue-dark);
    background: #eaf2ff;
    border-right: 1px solid #d4e1f5;
    font-size: 0.9rem;
    font-weight: 800;
}

.triangle-length-input input {
    min-width: 0;
    width: 100%;
    padding: 0 0.7rem;
    color: var(--ink);
    background: transparent;
    border: 0;
    outline: 0;
    font-size: 0.94rem;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}

.triangle-length-input input::placeholder {
    color: #a1abb9;
    font-weight: 400;
}

.triangle-length-input select {
    min-width: 72px;
    padding: 0 1.8rem 0 0.65rem;
    color: #536278;
    background: #eef2f7;
    border: 0;
    border-left: 1px solid #d7e0ea;
    font-size: 0.82rem;
    font-weight: 700;
}

.triangle-special-error {
    margin: 0.7rem 0 0;
    padding: 0.62rem 0.7rem;
    color: #963b30;
    background: #fff1ee;
    border: 1px solid #f0cbc5;
    border-radius: 9px;
    font-size: 0.78rem;
    font-weight: 650;
}

.triangle-special-actions {
    display: grid;
    grid-template-columns: 1.25fr 1fr auto;
    gap: 0.5rem;
    margin-top: 0.8rem;
}

.triangle-special-button,
.triangle-special-copy,
.triangle-special-example button {
    min-height: 41px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.55rem 0.72rem;
    color: #34455c;
    background: #fff;
    border: 1px solid #ccd6e4;
    border-radius: 9px;
    font-size: 0.8rem;
    font-weight: 700;
}

.triangle-special-button:hover,
.triangle-special-button:focus-visible,
.triangle-special-example button:hover,
.triangle-special-example button:focus-visible {
    color: var(--blue-dark);
    background: #f2f7ff;
    border-color: #a9c6f6;
}

.triangle-special-button--primary {
    color: #fff;
    background: var(--blue-dark);
    border-color: var(--blue-dark);
    box-shadow: 0 7px 16px rgba(21, 95, 219, 0.18);
}

.triangle-special-button--primary:hover,
.triangle-special-button--primary:focus-visible {
    color: #fff;
    background: #104fb4;
}

.triangle-special-button--quiet {
    color: #68768a;
    background: transparent;
    border-color: transparent;
}

.triangle-special-results {
    color: #fff;
    background:
        radial-gradient(circle at 100% 0, rgba(69, 215, 179, 0.18), transparent 34%),
        linear-gradient(145deg, #0b172a, #112744);
    border-left: 1px solid #203856;
}

.triangle-special-results__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.triangle-special-results__header .section-kicker {
    color: #84b5ff;
}

.triangle-special-results h2 {
    color: #fff;
    font-size: 1.1rem;
}

.triangle-special-copy {
    min-height: 36px;
    padding: 0.45rem 0.62rem;
    color: #dce7f5;
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.16);
}

.triangle-special-copy svg {
    width: 17px;
    height: 17px;
    fill: none;
    stroke: currentColor;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 1.7;
}

.triangle-special-copy:hover,
.triangle-special-copy:focus-visible,
.triangle-special-copy.is-copied {
    color: #08271f;
    background: var(--mint);
    border-color: var(--mint);
}

.triangle-special-copy:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.triangle-special-ratio {
    display: grid;
    gap: 0.25rem;
    margin-top: 1.15rem;
    padding: 0.85rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 12px;
}

.triangle-special-ratio span {
    color: #aebdd0;
    font-size: 0.78rem;
}

.triangle-special-ratio strong {
    color: #fff;
    font-size: clamp(1.05rem, 2.6vw, 1.35rem);
}

.triangle-special-placeholder {
    margin: 1rem 0 0;
    color: #aebed1;
    font-size: 0.82rem;
    line-height: 1.6;
}

.triangle-special-values {
    display: grid;
    gap: 0.55rem;
    margin-top: 0.75rem;
}

.triangle-special-values article {
    min-height: 55px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.7rem 0.75rem;
    background: rgba(255, 255, 255, 0.065);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.triangle-special-values__accent {
    background: rgba(69, 215, 179, 0.1) !important;
    border-color: rgba(69, 215, 179, 0.22) !important;
}

.triangle-special-values article > span {
    color: #aebdd0;
    font-size: 0.8rem;
}

.triangle-special-values article > span strong {
    margin-right: 0.3rem;
    color: #fff;
}

.triangle-special-values p {
    margin: 0;
    color: #fff;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.triangle-special-values b {
    font-size: 0.96rem;
}

.triangle-special-values small {
    color: #b7c7d9;
    font-size: 0.78rem;
}

.triangle-special-substitution {
    display: grid;
    gap: 0.25rem;
    margin-top: 0.65rem;
    padding: 0.72rem;
    color: #aebdd0;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 9px;
}

.triangle-special-substitution span {
    color: #c6d4e4;
    font-size: 0.78rem;
    font-weight: 700;
}

.triangle-special-substitution p {
    margin: 0;
    font-size: 0.78rem;
    line-height: 1.55;
}

.triangle-special-results--empty .triangle-special-ratio {
    opacity: 0.72;
}

.triangle-special-definition {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(310px, 0.8fr);
    gap: 1rem;
    margin-top: 3rem;
}

.triangle-special-definition > article,
.triangle-special-example {
    padding: 1.35rem;
    background: #fff;
    border: 1px solid #dfe5ee;
    border-radius: 17px;
}

.triangle-special-definition h2,
.triangle-special-formulas h2 {
    font-size: clamp(1.4rem, 3vw, 1.9rem);
}

.triangle-special-definition > article > p:not(.section-kicker) {
    margin: 0.75rem 0 0;
    color: #647287;
    font-size: 0.82rem;
    line-height: 1.7;
}

.triangle-special-side-guide {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.55rem;
    margin-top: 1rem;
}

.triangle-special-side-guide > div {
    display: grid;
    gap: 0.22rem;
    padding: 0.75rem;
    background: #f4f7fb;
    border-radius: 10px;
}

.triangle-special-side-guide span {
    color: var(--blue-dark);
    font-size: 0.82rem;
    font-weight: 800;
}

.triangle-special-side-guide strong {
    color: #33455d;
    font-size: 0.78rem;
}

.triangle-special-side-guide small {
    color: #718095;
    font-size: 0.76rem;
    line-height: 1.45;
}

.triangle-special-example {
    background:
        radial-gradient(circle at 100% 0, rgba(40, 120, 255, 0.11), transparent 38%),
        #f8fbff;
}

.triangle-special-example h2 {
    color: #263750;
    font-size: 1.05rem;
}

.triangle-special-example ul {
    display: grid;
    gap: 0.45rem;
    margin: 0.85rem 0 0;
    padding: 0;
    list-style: none;
}

.triangle-special-example li {
    display: grid;
    grid-template-columns: 31px minmax(0, 1fr);
    gap: 0.5rem;
    align-items: center;
}

.triangle-special-example li span {
    width: 31px;
    height: 31px;
    display: grid;
    place-items: center;
    color: var(--blue-dark);
    background: #e7f0ff;
    border-radius: 8px;
    font-size: 0.78rem;
    font-weight: 800;
}

.triangle-special-example li strong {
    color: #405169;
    font-size: 0.8rem;
}

.triangle-special-example button {
    width: 100%;
    margin-top: 0.75rem;
}

.triangle-special-formulas {
    margin-top: 2.8rem;
}

.triangle-special-formulas__grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: 1rem;
}

.triangle-special-formulas__grid article {
    padding: 0.95rem;
    background: #fff;
    border: 1px solid #dfe5ee;
    border-radius: 13px;
}

.triangle-special-formulas__grid article > span {
    color: var(--blue-dark);
    font-size: 0.78rem;
    font-weight: 800;
}

.triangle-special-formulas__grid h3 {
    margin: 0.42rem 0 0.5rem;
    color: #33445b;
    font-size: 0.88rem;
}

.triangle-special-formulas__grid p {
    margin: 0.28rem 0 0;
    color: #5f6f84;
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.8rem;
}

.triangle-special-faq {
    margin-top: 3rem;
}

@media (max-width: 920px) {
    .triangle-special-workbench,
    .triangle-special-definition {
        grid-template-columns: 1fr;
    }

    .triangle-special-results {
        border-top: 1px solid #203856;
        border-left: 0;
    }

    .triangle-special-formulas__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 650px) {
    .triangle-special-page .site-main {
        padding-top: 0.85rem;
    }

    .triangle-special-workbench {
        border-radius: 17px;
    }

    .triangle-special-form,
    .triangle-special-results,
    .triangle-special-definition > article,
    .triangle-special-example {
        padding: 1rem;
    }

    .triangle-special-actions {
        grid-template-columns: 1fr 1fr;
    }

    .triangle-special-button--primary {
        grid-column: 1 / -1;
    }

    .triangle-special-button--quiet {
        grid-column: 1 / -1;
    }

    .triangle-special-side-guide {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 460px) {
    .triangle-known-side > div,
    .triangle-special-formulas__grid {
        grid-template-columns: 1fr;
    }

    .triangle-known-side label > span {
        min-height: 50px;
        justify-items: start;
        padding-left: 0.75rem;
    }

    .triangle-special-actions {
        grid-template-columns: 1fr;
    }

    .triangle-special-button--primary,
    .triangle-special-button--quiet {
        grid-column: auto;
    }

    .triangle-special-results__header {
        align-items: flex-start;
        flex-direction: column;
    }

    .triangle-special-values article {
        align-items: flex-start;
        flex-direction: column;
        gap: 0.35rem;
    }
}