html,
body {
    width: 100%;
    min-height: 100%;
    overflow-x: hidden;
}

body {
    margin: 0;
    color: var(--color-text-primary);
    background:
        linear-gradient(90deg, rgba(19, 20, 22, 0.035) 1px, transparent 1px),
        linear-gradient(180deg, rgba(19, 20, 22, 0.035) 1px, transparent 1px),
        var(--color-bg-primary);
    background-size: 40px 40px;
    font-family: var(--font-family-body);
    -webkit-font-smoothing: antialiased;
}

button,
input,
select {
    font: inherit;
}

button {
    cursor: pointer;
}

.unit-main {
    width: min(1180px, calc(100% - 32px));
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin: 0 auto;
    padding: var(--space-4) 0 var(--space-6);
}

.unit-hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: var(--space-4);
    align-items: end;
}

.unit-hero-copy {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.unit-eyebrow,
.unit-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin: 0;
    color: var(--color-primary);
    font-size: var(--font-size-caption);
    line-height: var(--line-height-caption);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0;
    text-transform: uppercase;
}

.unit-hero h1 {
    max-width: 740px;
    margin: 0;
    color: var(--color-text-primary);
    font-family: var(--font-family-display);
    font-size: 58px;
    line-height: 1;
    font-weight: var(--font-weight-regular);
    letter-spacing: 0;
}

.unit-hero p {
    max-width: 640px;
    margin: 0;
    color: var(--color-neutral-dark);
    font-size: var(--font-size-body);
    line-height: var(--line-height-body);
}

.unit-hero-card {
    display: grid;
    gap: var(--space-1);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    padding: var(--space-2);
    box-shadow: var(--shadow-raised);
}

.unit-stat {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    border-radius: var(--radius-sm);
    background: var(--color-bg-lighter);
    padding: 12px 14px;
}

.unit-stat strong {
    color: var(--color-text-primary);
    font-family: var(--font-family-display);
    font-size: 24px;
    line-height: 1;
    font-weight: var(--font-weight-regular);
}

.unit-stat span {
    color: var(--color-neutral-dark);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
}

.unit-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 340px;
    gap: var(--space-3);
    align-items: start;
}

.unit-panel,
.unit-browser,
.history-section {
    min-width: 0;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    box-shadow: var(--shadow-raised);
}

.unit-panel {
    padding: var(--space-3);
}

.unit-panel--converter {
    position: relative;
    z-index: 2;
}

.unit-panel--side {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    position: sticky;
    top: var(--space-3);
}

.unit-panel-head,
.side-head,
.browser-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-2);
}

.unit-panel-head h2,
.side-head h2,
.browser-head h2 {
    margin: 4px 0 0;
    color: var(--color-text-primary);
    font-family: var(--font-family-display);
    font-size: var(--font-size-h2);
    line-height: var(--line-height-h2);
    font-weight: var(--font-weight-regular);
    letter-spacing: 0;
}

.unit-ghost-btn {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text-primary);
    padding: 0 var(--space-2);
    font-size: 13px;
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-raised);
}

.unit-ghost-btn:hover,
.quick-value:hover,
.mini-btn:hover,
.unit-select-option:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.category-tabs {
    display: grid;
    grid-template-columns: repeat(6, minmax(96px, 1fr));
    gap: var(--space-1);
    margin-top: var(--space-3);
}

.category-tab {
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-bg-lighter);
    color: var(--color-text-primary);
    padding: 0 12px;
    transition: border-color var(--transition-default), background var(--transition-default), color var(--transition-default);
}

.category-tab i {
    color: var(--color-primary);
}

.category-tab span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
    font-weight: var(--font-weight-bold);
}

.category-tab.is-active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-white);
}

.category-tab.is-active i {
    color: var(--color-white);
}

.converter-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 48px minmax(0, 1fr);
    gap: var(--space-2);
    align-items: end;
    margin-top: var(--space-3);
}

.converter-card {
    min-width: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-bg-lighter);
    padding: var(--space-2);
}

.converter-card--result {
    background: rgba(252, 100, 50, 0.06);
}

.converter-card label {
    color: var(--color-neutral-dark);
    font-size: var(--font-size-caption);
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
}

.converter-card input,
.precision-control select,
.unit-search-wrap input,
.unit-select-search input {
    width: 100%;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text-primary);
    outline: none;
}

.converter-card input {
    height: 64px;
    min-width: 0;
    padding: 0 var(--space-2);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 28px;
    font-weight: var(--font-weight-bold);
}

.converter-card input:focus,
.precision-control select:focus,
.unit-search-wrap input:focus,
.unit-select-search input:focus,
.unit-select-trigger:focus-visible {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus-ring);
}

.unit-select {
    position: relative;
}

.unit-select-trigger {
    width: 100%;
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-1);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-text-primary);
    padding: 8px 12px;
    text-align: left;
}

.unit-select-trigger span {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.unit-select-trigger strong {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}

.unit-select-trigger small {
    color: var(--color-neutral-dark);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
}

.unit-select-trigger i {
    flex-shrink: 0;
    color: var(--color-primary);
    transition: transform var(--transition-default);
}

.unit-select.is-open .unit-select-trigger i {
    transform: rotate(180deg);
}

.unit-select-popover {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    z-index: 30;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-white);
    padding: var(--space-1);
    box-shadow: 0 18px 40px rgba(19, 20, 22, 0.16);
}

.unit-select-popover[hidden] {
    display: none;
}

.unit-select-search {
    position: relative;
}

.unit-select-search i {
    position: absolute;
    left: 12px;
    top: 50%;
    color: var(--color-neutral-dark);
    transform: translateY(-50%);
    pointer-events: none;
}

.unit-select-search input {
    min-height: 42px;
    padding: 0 12px 0 36px;
}

.unit-select-options {
    max-height: 250px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: var(--space-1);
    overflow-y: auto;
    overscroll-behavior: contain;
}

.unit-select-option {
    width: 100%;
    min-height: 46px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-1);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    background: var(--color-bg-lighter);
    color: var(--color-text-primary);
    padding: 8px 10px;
    text-align: left;
}

.unit-select-option strong,
.unit-select-option span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.unit-select-option strong {
    font-size: 13px;
}

.unit-select-option span {
    max-width: 44%;
    color: var(--color-neutral-dark);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
}

.unit-select-option.is-selected {
    border-color: var(--color-primary);
    background: rgba(252, 100, 50, 0.08);
    color: var(--color-primary);
}

.unit-select-empty {
    margin: 0;
    padding: 12px;
    color: var(--color-neutral-dark);
    font-size: 13px;
    line-height: 20px;
}

.swap-btn {
    width: 48px;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius-circle);
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-raised);
}

.swap-btn:hover,
.unit-primary-btn:hover {
    background: var(--color-primary-hover);
}

.tools-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

.precision-control {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    color: var(--color-neutral-dark);
    font-size: 13px;
    font-weight: var(--font-weight-bold);
}

.precision-control select {
    min-height: 44px;
    padding: 0 var(--space-1);
    font-size: 14px;
    font-weight: var(--font-weight-semibold);
}

.unit-primary-btn {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    border: 0;
    border-radius: var(--radius-xl);
    background: var(--color-primary);
    color: var(--color-white);
    padding: 0 var(--space-3);
    font-size: var(--font-size-button);
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-raised);
}

.formula-card {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-2);
    margin-top: var(--space-3);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-bg-primary);
    padding: var(--space-2);
}

.formula-card p {
    margin: 4px 0 0;
    color: var(--color-text-primary);
    font-size: 14px;
    line-height: 22px;
    overflow-wrap: anywhere;
}

.unit-count {
    min-height: 28px;
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-lg);
    background: var(--color-white);
    padding: 0 10px;
    color: var(--color-neutral-dark);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
    white-space: nowrap;
}

.side-head>i {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-bg-neutral);
    color: var(--color-primary);
    flex-shrink: 0;
}

.quick-values {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
    margin-top: var(--space-2);
}

.quick-value {
    min-height: 36px;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-lg);
    background: var(--color-white);
    color: var(--color-text-primary);
    padding: 0 12px;
    font-size: 13px;
    font-weight: var(--font-weight-bold);
}

.equivalent-list,
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-top: var(--space-2);
}

.equivalent-item,
.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-bg-lighter);
    padding: 12px;
    min-width: 0;
}

.equivalent-item strong,
.history-item strong {
    display: block;
    color: var(--color-text-primary);
    font-size: 13px;
    overflow-wrap: anywhere;
}

.equivalent-item span,
.history-item span {
    color: var(--color-neutral-dark);
    font-size: 12px;
}

.unit-browser,
.history-section {
    padding: var(--space-3);
}

.unit-search-wrap {
    position: relative;
    min-width: 220px;
}

.unit-search-wrap i {
    position: absolute;
    left: 12px;
    top: 50%;
    color: var(--color-neutral-dark);
    transform: translateY(-50%);
    pointer-events: none;
}

.unit-search-wrap input {
    min-height: 44px;
    padding: 0 12px 0 36px;
}

.unit-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-2);
    margin-top: var(--space-3);
}

.unit-item {
    min-width: 0;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    background: var(--color-bg-lighter);
    padding: var(--space-2);
}

.unit-item-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-1);
}

.unit-item h3 {
    margin: 0;
    color: var(--color-text-primary);
    font-size: 15px;
    line-height: 21px;
}

.unit-symbol {
    min-height: 26px;
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(252, 100, 50, 0.22);
    border-radius: var(--radius-lg);
    background: rgba(252, 100, 50, 0.08);
    color: var(--color-primary);
    padding: 0 8px;
    font-size: 11px;
    font-weight: var(--font-weight-bold);
    white-space: nowrap;
}

.unit-item p {
    margin: var(--space-1) 0 0;
    color: var(--color-neutral-dark);
    font-size: 13px;
    line-height: 20px;
}

.unit-item-actions {
    display: flex;
    gap: var(--space-1);
    margin-top: var(--space-2);
}

.mini-btn {
    flex: 1;
    min-height: 34px;
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-lg);
    background: var(--color-white);
    color: var(--color-text-primary);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
}

.history-empty {
    margin: 0;
    color: var(--color-neutral-dark);
    font-size: 14px;
    line-height: 22px;
}

.unit-toast {
    position: fixed;
    left: 50%;
    bottom: 24px;
    z-index: 1000;
    max-width: calc(100vw - 32px);
    transform: translateX(-50%) translateY(24px);
    border-radius: var(--radius-xl);
    background: var(--color-text-primary);
    color: var(--color-white);
    padding: 12px 18px;
    font-size: 14px;
    font-weight: var(--font-weight-bold);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-default), transform var(--transition-default);
}

.unit-toast.is-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 1024px) {
    .unit-hero,
    .unit-workspace {
        grid-template-columns: 1fr;
    }

    .unit-panel--side {
        position: static;
    }

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

@media (max-width: 820px) {
    .category-tabs {
        display: flex;
        overflow-x: auto;
        padding-bottom: 4px;
        scroll-snap-type: x mandatory;
    }

    .category-tab {
        min-width: 138px;
        scroll-snap-align: start;
    }
}

@media (max-width: 720px) {
    .unit-main {
        width: min(100% - 24px, 1180px);
        gap: var(--space-3);
        padding-top: var(--space-3);
    }

    .unit-hero h1 {
        font-size: 40px;
        line-height: 44px;
    }

    .unit-hero-card,
    .unit-panel,
    .unit-browser,
    .history-section {
        padding: var(--space-2);
    }

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

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

    .tools-row,
    .formula-card,
    .browser-head {
        align-items: stretch;
        flex-direction: column;
    }

    .unit-search-wrap {
        min-width: 0;
        width: 100%;
    }

    .unit-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 420px) {
    .unit-hero h1 {
        font-size: 36px;
        line-height: 40px;
    }

    .unit-primary-btn {
        width: 100%;
    }

    .converter-card input {
        font-size: 22px;
    }
}