/* Stackaris Length Unit Converter - scoped, responsive, dependency-free */
.luc-tool {
    --luc-primary: #2563eb;
    --luc-primary-2: #14b8a6;
    --luc-accent: #f59e0b;
    --luc-warm: #f59e0b;
    --luc-bg: #eef4f8;
    --luc-bg-2: #fbfdff;
    --luc-card: rgba(255, 255, 255, 0.94);
    --luc-card-solid: #ffffff;
    --luc-text: #122033;
    --luc-muted: #617086;
    --luc-faint: #8a98ab;
    --luc-border: rgba(15, 23, 42, 0.11);
    --luc-success: #047857;
    --luc-danger: #dc2626;
    --luc-shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
    --luc-shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.08);
    --luc-radius-sm: 8px;
    --luc-radius: 8px;
    --luc-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        linear-gradient(145deg, rgba(37, 99, 235, 0.08), rgba(20, 184, 166, 0.1) 36%, transparent 58%),
        linear-gradient(180deg, var(--luc-bg-2), var(--luc-bg) 300px),
        var(--luc-bg);
    color: var(--luc-text);
    font-family: var(--luc-font);
    line-height: 1.6;
    margin-left: calc(50% - 50vw);
    margin-right: calc(50% - 50vw);
    overflow-x: hidden;
    width: 100vw;
}

.luc-tool[data-theme="dark"] {
    --luc-bg: #101826;
    --luc-bg-2: #111827;
    --luc-card: rgba(30, 41, 59, 0.92);
    --luc-card-solid: #1e293b;
    --luc-text: #e7eef9;
    --luc-muted: #a9b5c8;
    --luc-faint: #738097;
    --luc-border: rgba(226, 232, 240, 0.13);
    --luc-shadow: 0 18px 54px rgba(0, 0, 0, 0.36);
    --luc-shadow-soft: 0 8px 28px rgba(0, 0, 0, 0.28);
}

.luc-tool,
.luc-tool *,
.luc-tool *::before,
.luc-tool *::after {
    box-sizing: border-box;
}

.luc-tool h1,
.luc-tool h2,
.luc-tool h3,
.luc-tool p {
    margin-top: 0;
}

.luc-hero {
    padding: 44px 20px 18px;
    text-align: center;
}

.luc-hero__content {
    margin: 0 auto;
    max-width: 820px;
}

.luc-kicker,
.luc-eyebrow {
    color: var(--luc-primary);
    font-size: 0.75rem;
    font-weight: 850;
    letter-spacing: 0.04em;
    margin-bottom: 10px;
    text-transform: uppercase;
}

.luc-hero h1 {
    background: linear-gradient(135deg, var(--luc-text) 22%, var(--luc-primary), var(--luc-accent));
    background-clip: text;
    color: var(--luc-text);
    font-size: clamp(2rem, 4.4vw, 3rem);
    font-weight: 850;
    letter-spacing: 0;
    line-height: 1.1;
    margin-bottom: 14px;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.luc-hero__copy {
    color: var(--luc-muted);
    font-size: 1rem;
    line-height: 1.75;
    margin: 0 auto;
    max-width: 760px;
}

.luc-hero__stats {
    align-items: center;
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    justify-content: center;
    margin-top: 22px;
}

.luc-hero__stats span {
    color: var(--luc-faint);
    display: inline-flex;
    flex-direction: column;
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    min-width: 88px;
    text-transform: uppercase;
}

.luc-hero__stats span:not(:last-child) {
    border-right: 1px solid var(--luc-border);
    padding-right: 18px;
}

.luc-hero__stats strong {
    color: var(--luc-primary);
    font-size: 1.08rem;
    letter-spacing: 0;
    text-transform: none;
}

.luc-modebar,
.luc-workspace,
.luc-content,
.luc-faq,
.luc-related {
    margin-left: auto;
    margin-right: auto;
    max-width: 1120px;
    width: calc(100% - 40px);
}

.luc-modebar {
    align-items: center;
    background: var(--luc-card);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius);
    box-shadow: var(--luc-shadow-soft);
    display: flex;
    justify-content: space-between;
    margin-top: 26px;
    padding: 10px 12px 10px 16px;
}

.luc-modebar__name {
    color: var(--luc-text);
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.luc-theme-toggle,
.luc-btn,
.luc-swap,
.luc-combobox__button {
    align-items: center;
    border-radius: var(--luc-radius-sm);
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-size: 0.86rem;
    font-weight: 800;
    justify-content: center;
    min-height: 40px;
    transition: background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.luc-theme-toggle {
    background: var(--luc-text);
    border: 1px solid transparent;
    color: var(--luc-card-solid);
    gap: 8px;
    padding: 7px 12px;
}

.luc-theme-toggle__track {
    background: rgba(255, 255, 255, 0.24);
    border-radius: 999px;
    height: 18px;
    position: relative;
    width: 34px;
}

.luc-theme-toggle__track::after {
    background: #fff;
    border-radius: 50%;
    content: "";
    height: 14px;
    left: 2px;
    position: absolute;
    top: 2px;
    transition: transform 0.18s ease;
    width: 14px;
}

.luc-tool[data-theme="dark"] .luc-theme-toggle__track::after {
    transform: translateX(16px);
}

.luc-workspace {
    align-items: start;
    display: grid;
    gap: 16px;
    grid-template-columns: minmax(0, 1fr) 340px;
    padding-bottom: 16px;
}

.luc-panel,
.luc-content,
.luc-faq,
.luc-related {
    background: var(--luc-card);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius);
    box-shadow: var(--luc-shadow-soft);
    overflow: visible;
}

.luc-panel {
    min-width: 0;
}

.luc-panel__header,
.luc-section-heading {
    align-items: center;
    border-bottom: 1px solid var(--luc-border);
    display: flex;
    gap: 14px;
    justify-content: space-between;
    padding: 18px 22px;
}

.luc-panel h2,
.luc-content h2,
.luc-faq h2,
.luc-related h2 {
    color: var(--luc-text);
    font-size: 1.08rem;
    font-weight: 780;
    line-height: 1.25;
    margin: 0;
}

.luc-badge {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.28);
    border-radius: 999px;
    color: var(--luc-success);
    font-size: 0.74rem;
    font-weight: 850;
    padding: 5px 10px;
    white-space: nowrap;
}

.luc-converter-grid {
    align-items: end;
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr);
    padding: 22px;
}

.luc-convert-card {
    background: transparent;
    border: 0;
    border-radius: 0;
    display: grid;
    gap: 14px;
    min-width: 0;
    padding: 0;
}

.luc-field {
    display: grid;
    gap: 8px;
    min-width: 0;
}

.luc-field label,
.luc-range span {
    color: var(--luc-muted);
    font-size: 0.74rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.luc-field input,
.luc-combobox__button,
.luc-combobox__menu input {
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius-sm);
    color: var(--luc-text);
    outline: none;
    width: 100%;
}

.luc-field input {
    box-shadow: inset 0 1px 0 rgba(15, 23, 42, 0.03);
    font-size: 1.45rem;
    font-weight: 820;
    min-height: 58px;
    padding: 11px 14px;
}

.luc-output {
    align-items: center;
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius-sm);
    color: var(--luc-primary);
    display: flex;
    box-shadow: inset 0 1px 0 rgba(15, 23, 42, 0.03);
    font-size: 1.45rem;
    font-weight: 850;
    min-height: 58px;
    overflow-wrap: anywhere;
    padding: 11px 14px;
}

.luc-combobox {
    position: relative;
}

.luc-combobox__button {
    gap: 10px;
    justify-content: space-between;
    min-height: 50px;
    padding: 10px 14px;
    text-align: left;
}

.luc-combobox__button > span:last-child {
    color: var(--luc-muted);
    font-size: 0.78rem;
}

.luc-combobox__menu {
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius);
    box-shadow: var(--luc-shadow);
    left: 0;
    padding: 8px;
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    z-index: 20;
}

.luc-combobox__menu input {
    min-height: 40px;
    padding: 9px 10px;
}

.luc-combobox__list {
    display: grid;
    gap: 4px;
    margin-top: 8px;
    max-height: 210px;
    overflow: auto;
}

.luc-option {
    background: transparent;
    border: 0;
    border-radius: var(--luc-radius-sm);
    color: var(--luc-text);
    cursor: pointer;
    display: flex;
    font: inherit;
    justify-content: space-between;
    padding: 9px 10px;
    text-align: left;
    width: 100%;
}

.luc-option span {
    color: var(--luc-muted);
    font-size: 0.8rem;
}

.luc-option:hover,
.luc-option.is-selected {
    background: rgba(37, 99, 235, 0.1);
}

.luc-swap {
    align-self: center;
    background: linear-gradient(135deg, var(--luc-primary), var(--luc-primary-2));
    border: 0;
    box-shadow: var(--luc-shadow-soft);
    color: #fff;
    font-size: 1.15rem;
    height: 44px;
    width: 44px;
}

.luc-swap:hover,
.luc-btn:hover,
.luc-theme-toggle:hover {
    transform: translateY(-1px);
}

.luc-toolbar {
    align-items: center;
    border-top: 1px solid var(--luc-border);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 16px 22px;
}

.luc-range {
    align-items: center;
    display: flex;
    flex: 1 1 260px;
    gap: 10px;
}

.luc-range input {
    accent-color: var(--luc-primary);
    flex: 1;
}

.luc-range strong {
    background: rgba(37, 99, 235, 0.1);
    border-radius: var(--luc-radius-sm);
    color: var(--luc-primary);
    min-width: 36px;
    padding: 6px 8px;
    text-align: center;
}

.luc-btn {
    border: 1px solid var(--luc-border);
    padding: 9px 14px;
}

.luc-btn--primary {
    background: linear-gradient(135deg, var(--luc-primary), var(--luc-primary-2));
    border-color: transparent;
    color: #fff;
}

.luc-btn--ghost,
.luc-btn--quiet {
    background: var(--luc-card-solid);
    color: var(--luc-text);
}

.luc-btn--quiet {
    min-height: 34px;
    padding: 6px 10px;
}

.luc-formula {
    border-top: 1px solid var(--luc-border);
    color: var(--luc-muted);
    background: rgba(37, 99, 235, 0.04);
    color: var(--luc-muted);
    font-size: 0.95rem;
    padding: 14px 22px 18px;
}

.luc-history {
    display: grid;
    gap: 10px;
    list-style: none;
    margin: 0;
    max-height: 260px;
    overflow: auto;
    padding: 16px 18px 18px;
}

.luc-history li {
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius-sm);
    color: var(--luc-text);
    font-size: 0.92rem;
    line-height: 1.45;
    padding: 10px 12px;
}

.luc-history__empty {
    color: var(--luc-muted) !important;
}

.luc-content,
.luc-faq,
.luc-related {
    margin-top: 16px;
}

.luc-content {
    display: grid;
    gap: 24px;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.35fr);
    padding: 22px;
}

.luc-content p,
.luc-faq p {
    color: var(--luc-muted);
    margin-bottom: 0;
}

.luc-content__grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.luc-content__grid article {
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius);
    padding: 16px;
}

.luc-content h3 {
    color: var(--luc-text);
    font-size: 1rem;
    margin-bottom: 8px;
}

.luc-faq,
.luc-related {
    padding-bottom: 14px;
}

.luc-faq details {
    border-bottom: 1px solid var(--luc-border);
    padding: 14px 20px;
}

.luc-faq details:last-child {
    border-bottom: 0;
}

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

.luc-faq p {
    padding-top: 8px;
}

.luc-related {
    margin-bottom: 34px;
}

.luc-related__grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 18px 20px 20px;
}

.luc-related__grid a {
    background: var(--luc-card-solid);
    border: 1px solid var(--luc-border);
    border-radius: var(--luc-radius-sm);
    color: var(--luc-primary);
    font-weight: 800;
    padding: 14px;
    text-align: center;
    text-decoration: none;
    transition: background 0.18s ease, transform 0.18s ease;
}

.luc-related__grid a:hover {
    background: rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

.luc-tool :focus-visible {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.24);
    outline: 2px solid var(--luc-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .luc-tool *,
    .luc-tool *::before,
    .luc-tool *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}

@media (max-width: 980px) {
    .luc-workspace,
    .luc-content {
        grid-template-columns: 1fr;
    }

    .luc-content__grid {
        grid-template-columns: repeat(3, minmax(160px, 1fr));
        overflow-x: auto;
    }
}

@media (max-width: 760px) {
    .luc-modebar,
    .luc-workspace,
    .luc-content,
    .luc-faq,
    .luc-related {
        width: calc(100% - 28px);
    }

    .luc-hero {
        padding-top: 42px;
    }

    .luc-modebar,
    .luc-panel__header,
    .luc-section-heading,
    .luc-toolbar {
        align-items: stretch;
        flex-direction: column;
    }

    .luc-converter-grid {
        grid-template-columns: 1fr;
    }

    .luc-swap {
        justify-self: center;
        transform: rotate(90deg);
    }

    .luc-swap:hover {
        transform: rotate(90deg) translateX(1px);
    }

    .luc-related__grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 520px) {
    .luc-hero__stats span {
        border-right: 0 !important;
        padding-right: 0 !important;
    }

    .luc-converter-grid,
    .luc-toolbar,
    .luc-content,
    .luc-related__grid {
        padding-left: 14px;
        padding-right: 14px;
    }

    .luc-related__grid {
        grid-template-columns: 1fr;
    }
}