/**
 * Area Calculator — scoped styles.
 * Mobile-first: targets one-screen fit on 375 px viewport.
 * Reuses ci-form, ci-insights, result-block, result-primary,
 * result-row from main.css — never redefines them.
 */

/* -- Mode tabs ----------------------------------------------------------------
   5 tabs: do NOT use flex:1 (causes label truncation on narrow screens).
   Instead let each tab be auto-sized and rely on overflow-x:auto scrolling.
   Tabs snap to the left; active tab is always reachable without scrolling
   because setMode() is called on init and the tab row resets scroll position. */
.ac-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-3);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.ac-tabs::-webkit-scrollbar { display: none; }

.ac-tab {
    flex: 0 0 auto;                 /* do not stretch — allow natural label width */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-3);
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-2);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    cursor: pointer;
    white-space: nowrap;
    min-height: 44px;               /* minimum touch target */
    transition: color var(--transition-fast), border-color var(--transition-fast);
}
.ac-tab:hover { color: var(--color-text-1); }
.ac-tab--active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* -- Dimension panels --------------------------------------------------------- */

/* 2-field panels (rectangle, triangle, wall header, room header) */
.ac-panel--2col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 var(--space-2);
}

/* Single-field panel (circle): constrain to half width so it does not
   look isolated in a full-width row, but stays above 200px minimum */
.ac-panel--1col {
    display: grid;
    grid-template-columns: minmax(160px, 50%);
}

/* Tighter form-group spacing inside all panels */
.ac-panel .form-group,
.ac-panel--2col .form-group {
    margin-bottom: var(--space-3);
}

/* Compact label inside panels — matches concrete.css */
.ac-panel .form-label,
.ac-panel--2col .form-label {
    font-size: var(--text-xs);
}

/* -- Room: optional height field — half-width so it reads as secondary ------- */
.ac-room-height-group {
    margin-bottom: var(--space-2);
}

/* Constrain the height input to roughly half the panel so it is visually
   subordinate to the 2-col dimension row above it */
.ac-input-half {
    max-width: 50%;
}

/* -- Hint text ---------------------------------------------------------------- */
.ac-hint {
    font-size: var(--text-xs);
    color: var(--color-text-3);
    margin-top: var(--space-1);
    line-height: 1.4;
}

/* -- Openings section ---------------------------------------------------------
   Visually separated from dimension inputs by a hairline border.
   The title ("Subtract Openings") uses an uppercase micro-label style.
   "Windows" / "Doors" sub-labels use a lower-contrast style to read as
   subordinate group headings, not equal to the section title. */
.ac-openings {
    margin-top: var(--space-1);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.ac-openings__title {
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-2);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-3);
}

.ac-opening-group {
    margin-bottom: var(--space-3);
}
.ac-opening-group:last-child {
    margin-bottom: var(--space-1);
}

/* Sub-label ("Windows", "Doors") — clearly subordinate to the section title */
.ac-opening-label {
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-3);
    margin-bottom: var(--space-2);
    padding-left: var(--space-1);
    border-left: 2px solid var(--color-border);
}

/* 3-column grid: width | height | qty
   Qty column is narrower — 80px is the minimum comfortable touch target
   while still leaving room for the two dimension inputs on 375 px. */
.ac-opening-fields {
    display: grid;
    grid-template-columns: 1fr 1fr 80px;
    gap: 0 var(--space-2);
}

.ac-opening-fields .form-group {
    margin-bottom: var(--space-2);
}

.ac-opening-fields .form-label {
    font-size: var(--text-xs);
}

/* -- Result block overrides — tighter for mobile ------------------------------ */
.ac-result-block {
    min-height: 80px;           /* override main.css 120 px to save screen space */
    margin-top: var(--space-3);
    padding: var(--space-4);
}

/* -- Result header: primary value + share button in one row ------------------- */
.ac-result-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

/* Compact primary result — remove tall padding from main.css */
.ac-result-primary {
    padding: 0;
    margin-bottom: 0;
    text-align: left;           /* left-align on mobile for compactness */
}

/* Share button aligned to the top-right of the header row */
.ac-share-btn {
    flex-shrink: 0;
    margin-top: var(--space-1);
}

/* Stats section spacing */
.ac-stats {
    margin-bottom: var(--space-2);
}

/* Indented sub-rows (window/door breakdown within openings) */
.ac-row-indent .result-row__label {
    padding-left: var(--space-4);
    color: var(--color-text-3);
    font-size: var(--text-xs);
}
.ac-row-indent .result-row__value {
    font-size: var(--text-sm);
    color: var(--color-text-2);
}

/* -- Insights collapsible — matches concrete.css pattern --------------------- */
.ac-insights-wrap {
    margin-top: var(--space-2);
    border-top: 1px solid var(--color-border);
}

.ac-insights-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    font-size: var(--text-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-3);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: color var(--transition-fast);
}
.ac-insights-toggle::-webkit-details-marker { display: none; }
.ac-insights-toggle::before {
    content: '▸';              /* literal character matches concrete.css exactly */
    font-size: var(--text-xs);
    transition: transform var(--transition-fast);
    color: var(--color-text-3);
}
.ac-insights-wrap[open] .ac-insights-toggle::before {
    transform: rotate(90deg);
}
.ac-insights-toggle:hover {
    color: var(--color-text-2);
}

.ac-insights-wrap .ci-insights {
    margin-top: var(--space-2);
}

/* -- Field validation --------------------------------------------------------- */
.form-input[aria-invalid="true"] {
    border-color: var(--color-error);
    box-shadow: 0 0 0 1px var(--color-error);
}

/* -- Responsive — loosen layout on wider screens ----------------------------- */
@media (min-width: 480px) {
    .ac-tab {
        font-size: var(--text-sm);
        padding: var(--space-2) var(--space-4);
    }
    .ac-tabs {
        margin-bottom: var(--space-4);
    }
    .ac-panel--2col {
        gap: 0 var(--space-4);
    }
    .ac-opening-fields {
        gap: 0 var(--space-3);
    }
    .ac-result-block {
        padding: var(--space-5);
    }
    .ac-result-primary {
        text-align: center;     /* centre the hero value on wider viewports */
    }
    .ac-input-half {
        max-width: 40%;
    }
}