.page-main {
    position: relative;
    z-index: 1;
    padding-top: 104px;
}

.page-hero {
    position: relative;
    z-index: 1;
    padding: 36px 0 80px;
}

.page-header {
    max-width: 820px;
    margin: 0 auto 32px;
}

.page-stack {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.page-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

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

.page-prose {
    padding: 36px;
}

.page-prose h3 + p,
.page-prose p + h3,
.page-prose .prose-title + p,
.page-prose p + .prose-title {
    margin-top: 18px;
}

.page-prose .prose-title {
    font-family: var(--font-display, inherit);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    margin-top: 24px;
    margin-bottom: 8px;
}

.page-prose p:not(.prose-title) {
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.8;
}

.page-link-list {
    list-style: none;
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.page-link-list a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.page-link-list a:hover {
    color: var(--accent-start);
}

.page-note {
    margin-top: 12px;
    color: var(--text-tertiary);
    font-size: 0.82rem;
}

.page-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 28px;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
        position: absolute;
        top: calc(100% + 12px);
        left: 32px;
        right: 32px;
        flex-direction: column;
        gap: 8px;
        padding: 16px;
        border: 1px solid var(--border-subtle);
        border-radius: var(--radius-lg);
        background: rgba(13, 15, 26, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: var(--shadow-lg);
    }

    .nav-links.is-open {
        display: flex;
    }

    .nav-link {
        width: 100%;
    }

    .page-grid,
    .page-grid-2 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .page-main {
        padding-top: 92px;
    }

    .page-hero {
        padding-top: 24px;
        padding-bottom: 64px;
    }

    .page-prose {
        padding: 28px 22px;
    }

    .nav-links {
        left: 20px;
        right: 20px;
    }
}

/* Sitemap Custom Styles */
.sitemap-sections {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.sitemap-card {
    padding: 32px;
}

.card-header-with-icon {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.08));
}

.card-header-with-icon h3,
.card-header-with-icon .card-header-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 4px;
}

.card-desc {
    color: var(--text-tertiary, #94a3b8);
    font-size: 0.9rem;
}

.sitemap-link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.sitemap-link-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.06));
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.25s ease;
}

.sitemap-link-item:hover {
    background: rgba(99, 102, 241, 0.08);
    border-color: rgba(99, 102, 241, 0.3);
    transform: translateY(-2px);
}

.link-item-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    font-size: 1rem;
    color: #ffffff;
}

.sitemap-link-item:hover .link-item-title {
    color: #818cf8;
}

.link-arrow {
    opacity: 0.6;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.sitemap-link-item:hover .link-arrow {
    opacity: 1;
    transform: translateX(4px);
}

.link-item-desc {
    font-size: 0.83rem;
    color: var(--text-secondary, #94a3b8);
    line-height: 1.4;
}

.sitemap-xml-notice {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.06) 0%, rgba(6, 182, 212, 0.06) 100%);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.xml-link-wrapper {
    margin-top: 12px;
}

.xml-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 10px;
    text-decoration: none;
    transition: all 0.25s ease;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.25);
}

.xml-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.35);
}

/* Specialized calculator library */
.tool-hero,
.calculator-hub-hero {
    position: relative;
    padding: 34px 0 80px;
}

.tool-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 58px;
    color: var(--text-tertiary);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.tool-breadcrumbs a:hover {
    color: #a5b4fc;
}

.tool-breadcrumbs span[aria-current="page"] {
    min-width: 0;
    overflow: hidden;
    color: var(--text-secondary);
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tool-hero-copy {
    max-width: 880px;
    margin: 0 auto 48px;
    text-align: center;
}

.tool-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 18px;
    color: #a5b4fc;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.tool-eyebrow span {
    width: 22px;
    height: 1px;
    background: linear-gradient(90deg, #818cf8, #22d3ee);
}

.tool-hero-copy h1 {
    max-width: 920px;
    margin: 0 auto;
    font-family: var(--font-display);
    font-size: clamp(2.45rem, 5.8vw, 4.7rem);
    line-height: 0.98;
    letter-spacing: -0.055em;
}

.tool-hero-copy > p {
    max-width: 720px;
    margin: 24px auto 0;
    color: var(--text-secondary);
    font-size: clamp(1rem, 1.7vw, 1.15rem);
    line-height: 1.75;
}

.tool-trust-row {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 26px;
    flex-wrap: wrap;
}

.tool-trust-row span {
    padding: 7px 12px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.025);
    color: var(--text-tertiary);
    font-size: 0.72rem;
    font-weight: 600;
}

.tool-trust-row span::before {
    content: "";
    display: inline-block;
    width: 5px;
    height: 5px;
    margin: 0 7px 1px 0;
    border-radius: 50%;
    background: #22d3ee;
    box-shadow: 0 0 10px rgba(34, 211, 238, 0.75);
}

.subcalc-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    max-width: 1120px;
    margin: 0 auto;
    border: 1px solid rgba(129, 140, 248, 0.18);
    border-radius: 26px;
    background: rgba(10, 12, 23, 0.86);
    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.36), 0 0 80px rgba(99, 102, 241, 0.07);
    overflow: hidden;
}

.subcalc-panel {
    min-width: 0;
    padding: 34px;
}

.subcalc-controls {
    border-right: 1px solid var(--border-subtle);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.024), transparent 70%);
}

.subcalc-results {
    background: radial-gradient(circle at 50% 20%, rgba(79, 70, 229, 0.1), transparent 45%);
}

.subcalc-panel-heading {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 28px;
}

.subcalc-panel-heading h2 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.subcalc-panel-heading p {
    margin-top: 2px;
    color: var(--text-tertiary);
    font-size: 0.77rem;
}

.subcalc-step {
    display: grid;
    width: 39px;
    height: 39px;
    place-items: center;
    flex: 0 0 auto;
    border: 1px solid rgba(129, 140, 248, 0.3);
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.11);
    color: #a5b4fc;
    font-family: var(--font-display);
    font-size: 0.72rem;
    font-weight: 700;
}

.subcalc-field-grid,
.subcalc-dimensions {
    display: grid;
    gap: 15px;
}

.subcalc-field-grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.subcalc-dimensions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 15px;
}

.subcalc-field {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 8px;
}

.subcalc-field > span,
.subcalc-range-label > span {
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.subcalc-field select,
.subcalc-field input[type="number"] {
    width: 100%;
    height: 48px;
    border: 1px solid var(--border-light);
    outline: none;
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.035);
    color: var(--text-primary);
    font: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.subcalc-field select {
    padding: 0 40px 0 14px;
    color-scheme: dark;
}

.subcalc-field input[type="number"] {
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 0 8px 0 14px;
}

.subcalc-field select:focus,
.subcalc-input-unit:focus-within {
    border-color: rgba(129, 140, 248, 0.7);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
}

.subcalc-input-unit {
    display: flex;
    align-items: center;
    height: 48px;
    border: 1px solid var(--border-light);
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.035);
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.subcalc-input-unit > span {
    min-width: 39px;
    padding-right: 12px;
    color: #818cf8;
    font-size: 0.72rem;
    font-weight: 800;
    text-align: right;
}

.subcalc-range-field {
    margin-top: 24px;
}

.subcalc-range-label,
.subcalc-range-scale {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.subcalc-range-label output {
    color: #22d3ee;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
}

.subcalc-range-field input[type="range"] {
    width: 100%;
    height: 4px;
    margin: 7px 0 0;
    border-radius: 99px;
    accent-color: #6366f1;
    cursor: pointer;
}

.subcalc-range-scale {
    color: var(--text-muted);
    font-size: 0.64rem;
}

.subcalc-range-field + .subcalc-field {
    margin-top: 22px;
}

.subcalc-reset {
    margin-top: 24px;
    color: var(--text-tertiary);
    font-size: 0.72rem;
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.15);
    text-underline-offset: 4px;
}

.subcalc-reset:hover {
    color: #a5b4fc;
}

.subcalc-visual {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 25px;
    min-height: 142px;
    margin: -2px 0 25px;
    padding: 12px 22px 0;
}

.subcalc-tank-shape {
    position: relative;
    width: 116px;
    height: 124px;
    flex: 0 0 auto;
    border: 2px solid rgba(129, 140, 248, 0.7);
    border-radius: 11px 11px 18px 18px;
    box-shadow: inset 0 0 25px rgba(99, 102, 241, 0.07), 0 0 30px rgba(99, 102, 241, 0.08);
    overflow: hidden;
    transition: width 0.25s ease, border-radius 0.25s ease;
}

.subcalc-tank-shape[data-shape="vertical-cylinder"] {
    width: 95px;
    border-radius: 45% / 10%;
}

.subcalc-tank-shape[data-shape="horizontal-cylinder"] {
    width: 150px;
    height: 92px;
    border-radius: 45% / 50%;
}

.subcalc-tank-shape[data-shape="cone-bottom"] {
    width: 108px;
    height: 130px;
    border-radius: 40% 40% 50% 50% / 8% 8% 35% 35%;
}

.subcalc-liquid {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    min-height: 0;
    background: linear-gradient(180deg, rgba(34, 211, 238, 0.36), rgba(79, 70, 229, 0.52));
    transition: height 0.25s ease;
}

.subcalc-liquid::before {
    content: "";
    position: absolute;
    top: -3px;
    right: 0;
    left: 0;
    height: 5px;
    border-radius: 50%;
    background: rgba(103, 232, 249, 0.65);
    box-shadow: 0 0 12px rgba(34, 211, 238, 0.65);
}

.subcalc-tank-line {
    position: absolute;
    z-index: 2;
    background: rgba(255, 255, 255, 0.12);
}

.subcalc-line-a {
    top: 14%;
    bottom: 14%;
    left: 50%;
    width: 1px;
}

.subcalc-line-b {
    top: 50%;
    right: 14%;
    left: 14%;
    height: 1px;
}

.subcalc-visual-caption {
    display: flex;
    padding-bottom: 12px;
    flex-direction: column;
    gap: 2px;
}

.subcalc-visual-caption span {
    color: var(--text-secondary);
    font-size: 0.73rem;
}

.subcalc-visual-caption strong {
    color: #67e8f9;
    font-family: var(--font-display);
    font-size: 0.92rem;
}

.subcalc-output-select {
    margin-bottom: 16px;
}

.subcalc-primary-result {
    padding: 20px;
    border: 1px solid rgba(129, 140, 248, 0.25);
    border-radius: 15px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.06));
}

.subcalc-primary-result > span,
.subcalc-result-card > span,
.subcalc-formula-live > span {
    display: block;
    color: var(--text-tertiary);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.subcalc-primary-result strong {
    display: block;
    margin-top: 5px;
    color: #fff;
    font-family: var(--font-display);
    font-size: clamp(2rem, 4.5vw, 3rem);
    line-height: 1;
    letter-spacing: -0.04em;
}

.subcalc-primary-result small {
    color: #67e8f9;
    font-size: 0.85rem;
    letter-spacing: 0;
}

.subcalc-result-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-top: 9px;
}

.subcalc-result-card {
    min-width: 0;
    padding: 13px;
    border: 1px solid var(--border-subtle);
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.025);
}

.subcalc-result-card > span {
    min-height: 28px;
    line-height: 1.35;
}

.subcalc-result-card strong {
    display: block;
    margin-top: 6px;
    overflow: hidden;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 0.94rem;
    text-overflow: ellipsis;
}

.subcalc-result-card small {
    display: block;
    margin-top: 1px;
    color: var(--text-muted);
    font-size: 0.61rem;
}

.subcalc-result-card-wide {
    grid-column: span 3;
    background: rgba(34, 211, 238, 0.04);
}

.subcalc-result-card-wide > span {
    min-height: auto;
}

.subcalc-formula-live {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-subtle);
}

.subcalc-formula-live code {
    color: #a5b4fc;
    font-family: var(--font-display);
    font-size: 0.75rem;
    text-align: right;
}

.tool-content-section {
    position: relative;
    padding: 100px 0 120px;
    border-top: 1px solid rgba(255, 255, 255, 0.035);
    background: rgba(255, 255, 255, 0.012);
}

.tool-content-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 310px;
    gap: 70px;
    align-items: start;
}

.tool-article {
    min-width: 0;
}

.tool-note {
    display: flex;
    gap: 16px;
    padding: 22px;
    border: 1px solid rgba(34, 211, 238, 0.17);
    border-radius: 15px;
    background: rgba(6, 182, 212, 0.045);
}

.tool-note-mark {
    display: grid;
    width: 29px;
    height: 29px;
    place-items: center;
    flex: 0 0 auto;
    border: 1px solid rgba(34, 211, 238, 0.4);
    border-radius: 50%;
    color: #67e8f9;
    font-family: Georgia, serif;
    font-size: 0.9rem;
    font-style: italic;
    font-weight: 700;
}

.tool-note strong {
    font-size: 0.88rem;
}

.tool-note p {
    margin-top: 4px;
    color: var(--text-secondary);
    font-size: 0.83rem;
    line-height: 1.65;
}

.tool-copy-block {
    padding: 72px 0 0;
}

.tool-section-kicker,
.calculator-card-eyebrow {
    color: #818cf8;
    font-size: 0.67rem;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.tool-copy-block h2,
.tool-sidebar-card h2,
.calculator-hub-group-heading h2 {
    margin-top: 9px;
    font-family: var(--font-display);
    font-size: clamp(1.65rem, 3vw, 2.35rem);
    line-height: 1.15;
    letter-spacing: -0.04em;
}

.tool-lead-copy {
    margin-top: 16px;
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.75;
}

.tool-steps {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 26px;
}

.tool-steps > div {
    padding: 20px;
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.02);
}

.tool-steps > div > span {
    display: grid;
    width: 25px;
    height: 25px;
    place-items: center;
    border-radius: 7px;
    background: rgba(99, 102, 241, 0.12);
    color: #a5b4fc;
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
}

.tool-steps h3 {
    margin-top: 18px;
    font-size: 0.9rem;
}

.tool-steps p {
    margin-top: 7px;
    color: var(--text-tertiary);
    font-size: 0.76rem;
    line-height: 1.55;
}

.tool-formula-list {
    margin-top: 24px;
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    overflow: hidden;
}

.tool-formula-list > div {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 20px;
    padding: 16px 18px;
    background: rgba(255, 255, 255, 0.018);
}

.tool-formula-list > div + div {
    border-top: 1px solid var(--border-subtle);
}

.tool-formula-list code {
    color: #a5b4fc;
    font-size: 0.74rem;
    font-weight: 700;
}

.tool-formula-list span {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.tool-table-wrap {
    margin-top: 24px;
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    overflow-x: auto;
}

.tool-conversion-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}

.tool-conversion-table th,
.tool-conversion-table td {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-subtle);
    text-align: left;
}

.tool-conversion-table th {
    background: rgba(99, 102, 241, 0.07);
    color: #c7d2fe;
    font-size: 0.67rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.tool-conversion-table td {
    color: var(--text-secondary);
}

.tool-conversion-table tr:last-child td {
    border-bottom: 0;
}

.tool-use-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 24px;
}

.tool-use-grid div {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.78rem;
}

.tool-use-grid span {
    display: grid;
    width: 20px;
    height: 20px;
    place-items: center;
    flex: 0 0 auto;
    border-radius: 50%;
    background: rgba(34, 211, 238, 0.1);
    color: #67e8f9;
    font-size: 0.63rem;
}

.tool-faq-list {
    margin-top: 24px;
    border-top: 1px solid var(--border-subtle);
}

.tool-faq-list details {
    border-bottom: 1px solid var(--border-subtle);
}

.tool-faq-list summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 20px 0;
    cursor: pointer;
    list-style: none;
    font-size: 0.9rem;
    font-weight: 650;
}

.tool-faq-list summary::-webkit-details-marker {
    display: none;
}

.tool-faq-list summary span {
    color: #818cf8;
    font-size: 1.25rem;
    font-weight: 300;
    transition: transform 0.2s ease;
}

.tool-faq-list details[open] summary span {
    transform: rotate(45deg);
}

.tool-faq-list details p {
    max-width: 690px;
    padding: 0 0 22px;
    color: var(--text-secondary);
    font-size: 0.84rem;
    line-height: 1.7;
}

.tool-sidebar {
    position: sticky;
    top: 105px;
}

.tool-sidebar-card {
    padding: 24px;
    border: 1px solid var(--border-subtle);
    border-radius: 17px;
    background: rgba(13, 15, 26, 0.74);
    box-shadow: var(--shadow-sm);
}

.tool-sidebar-card h2 {
    font-size: 1.25rem;
}

.tool-related-list {
    display: flex;
    margin-top: 20px;
    flex-direction: column;
}

.tool-related-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding: 14px 0;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
}

.tool-related-list a:hover {
    color: #a5b4fc;
}

.tool-related-list a span:last-child {
    color: #818cf8;
}

.tool-all-link {
    display: flex;
    justify-content: center;
    margin-top: 18px;
    padding: 11px 15px;
    border: 1px solid rgba(129, 140, 248, 0.25);
    border-radius: 10px;
    background: rgba(99, 102, 241, 0.07);
    color: #c7d2fe;
    font-size: 0.74rem;
    font-weight: 700;
}

.tool-all-link:hover {
    border-color: rgba(129, 140, 248, 0.55);
    background: rgba(99, 102, 241, 0.13);
}

/* Calculator library hub */
.calculator-hub-hero {
    padding-bottom: 62px;
}

.calculator-hub-copy {
    margin-bottom: 40px;
}

.calculator-hub-copy h1 span {
    white-space: nowrap;
}

.calculator-hub-summary {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: 670px;
    margin: 0 auto;
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.018);
}

.calculator-hub-summary > div {
    display: flex;
    padding: 20px;
    flex-direction: column;
    text-align: center;
}

.calculator-hub-summary > div + div {
    border-left: 1px solid var(--border-subtle);
}

.calculator-hub-summary strong {
    font-family: var(--font-display);
    font-size: 1.45rem;
}

.calculator-hub-summary span {
    color: var(--text-tertiary);
    font-size: 0.68rem;
}

.calculator-hub-groups {
    padding: 10px 0 120px;
}

.calculator-hub-group + .calculator-hub-group {
    margin-top: 80px;
}

.calculator-hub-group-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.calculator-hub-group-heading h2 {
    margin-top: 0;
    font-size: 1.65rem;
}

.calculator-hub-group-heading p {
    margin-top: 7px;
    color: var(--text-tertiary);
    font-size: 0.82rem;
}

.calculator-hub-group-heading > span {
    padding: 6px 10px;
    border: 1px solid var(--border-subtle);
    border-radius: 999px;
    color: var(--text-muted);
    font-size: 0.66rem;
    white-space: nowrap;
}

.calculator-card-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.calculator-library-card {
    position: relative;
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr) 24px;
    gap: 14px;
    min-height: 170px;
    padding: 24px;
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.018);
    overflow: hidden;
}

.calculator-library-card::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.1), transparent 68%);
    transform: translate(45%, -45%);
    opacity: 0;
    transition: opacity 0.25s ease;
}

.calculator-library-card:hover {
    border-color: rgba(129, 140, 248, 0.32);
    background: rgba(99, 102, 241, 0.04);
    transform: translateY(-2px);
}

.calculator-library-card:hover::before {
    opacity: 1;
}

.calculator-card-number {
    color: var(--text-muted);
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
}

.calculator-library-card h3 {
    margin-top: 8px;
    font-family: var(--font-display);
    font-size: 1.12rem;
    letter-spacing: -0.025em;
}

.calculator-library-card p {
    margin-top: 8px;
    color: var(--text-tertiary);
    font-size: 0.76rem;
    line-height: 1.55;
}

.calculator-card-arrow {
    align-self: center;
    color: #818cf8;
    font-size: 1.2rem;
    transition: transform 0.2s ease;
}

.calculator-library-card:hover .calculator-card-arrow {
    transform: translateX(4px);
}

@media (max-width: 1000px) {
    .subcalc-shell {
        grid-template-columns: 1fr;
        max-width: 680px;
    }

    .subcalc-controls {
        border-right: 0;
        border-bottom: 1px solid var(--border-subtle);
    }

    .tool-content-layout {
        grid-template-columns: minmax(0, 1fr) 260px;
        gap: 38px;
    }
}

@media (max-width: 780px) {
    .tool-hero,
    .calculator-hub-hero {
        padding-top: 20px;
        padding-bottom: 64px;
    }

    .tool-breadcrumbs {
        margin-bottom: 42px;
    }

    .tool-hero-copy h1 {
        font-size: clamp(2.35rem, 12vw, 3.7rem);
    }

    .tool-content-layout {
        grid-template-columns: 1fr;
    }

    .tool-sidebar {
        position: static;
    }

    .tool-steps,
    .tool-use-grid {
        grid-template-columns: 1fr;
    }

    .calculator-card-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 560px) {
    .subcalc-panel {
        padding: 25px 19px;
    }

    .subcalc-field-grid-2,
    .subcalc-dimensions {
        grid-template-columns: 1fr;
    }

    .subcalc-result-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .subcalc-result-card-wide {
        grid-column: span 2;
    }

    .subcalc-visual {
        gap: 18px;
        padding-right: 4px;
        padding-left: 4px;
    }

    .subcalc-tank-shape[data-shape="horizontal-cylinder"] {
        width: 125px;
    }

    .subcalc-formula-live {
        align-items: flex-start;
        flex-direction: column;
    }

    .subcalc-formula-live code {
        text-align: left;
    }

    .tool-content-section {
        padding-top: 70px;
        padding-bottom: 90px;
    }

    .tool-formula-list > div {
        grid-template-columns: 1fr;
        gap: 7px;
    }

    .calculator-hub-summary {
        grid-template-columns: 1fr;
    }

    .calculator-hub-summary > div + div {
        border-top: 1px solid var(--border-subtle);
        border-left: 0;
    }

    .calculator-hub-group-heading {
        align-items: flex-start;
        flex-direction: column;
    }

    .calculator-library-card {
        grid-template-columns: 28px minmax(0, 1fr);
        padding: 20px;
    }

    .calculator-card-arrow {
        display: none;
    }
}