/* ==========================================================================
   Calculator engine UI (calculator.css)
   The engine (js/calculator.js) renders the form, results and row editors
   into [data-calculator]. Class names below match the engine output.
   ========================================================================== */

.calc-shell {
    padding-block: clamp(1.25rem, 3vw, 2rem);
}

.calc-app {
    max-width: var(--container-calc);
    margin-inline: auto;
}

/* ---------- Card ---------- */

.calc-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: clamp(1.15rem, 3vw, 1.9rem);
}

/* ---------- Mode tabs ---------- */

.mode-tabs {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    gap: 0.25rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    margin-bottom: 1.4rem;
    overflow-x: auto;
}

.mode-tab {
    min-height: 2.5rem;
    padding: 0.35rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
    transition: background-color var(--transition-fast), color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.mode-tab:hover {
    color: var(--color-text);
}

.mode-tab[aria-pressed="true"] {
    background: var(--color-background);
    color: var(--color-primary-active);
    box-shadow: var(--shadow-sm);
}

/* ---------- Form ---------- */

.calc-form {
    display: block;
}

.field-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem 1rem;
}

@media (min-width: 40em) {
    .field-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .field--full {
        grid-column: 1 / -1;
    }
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.field__label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text);
}

.field__label .field__optional {
    color: var(--color-text-faint);
    font-weight: 500;
    font-size: 0.8rem;
}

.field__hint {
    font-size: 0.8rem;
    color: var(--color-text-faint);
    line-height: 1.45;
}

.field__error {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.83rem;
    color: var(--color-error);
    font-weight: 550;
}

.field__error svg {
    width: 1rem;
    height: 1rem;
    flex: 0 0 auto;
}

.field.has-error .input,
.field.has-error .select {
    border-color: var(--color-error);
}

.field.has-error .input:focus {
    box-shadow: 0 0 0 3px rgba(217, 45, 32, 0.25);
}

/* ---------- Inputs ---------- */

.input,
.select,
.textarea {
    width: 100%;
    min-height: var(--control-height);
    padding: 0.55rem 0.85rem;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    background: var(--color-background);
    color: var(--color-text);
    font-size: 1rem;
    font-variant-numeric: tabular-nums;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
        background-color var(--transition-fast);
}

.textarea {
    min-height: 8rem;
    font-family: inherit;
    line-height: 1.6;
}

.input:focus,
.select:focus,
.textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-ring);
}

.input::placeholder {
    color: var(--color-text-faint);
}

/* numeric inputs keep digits LTR even in RTL pages */
.input--num {
    direction: ltr;
    text-align: start;
}

html[dir="rtl"] .input--num {
    text-align: end;
}

.select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23667085' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: 1rem;
    background-position: right 0.8rem center;
    padding-inline-end: 2.4rem;
    cursor: pointer;
}

html[dir="rtl"] .select {
    background-position: left 0.8rem center;
}

.input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrap .input {
    padding-inline-end: 2.6rem;
}

.input-suffix {
    position: absolute;
    inset-inline-end: 0.85rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-faint);
    pointer-events: none;
    direction: ltr;
}

/* ---------- Row editor (GPA, weighted grades) ---------- */

.rows-editor {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.6rem;
    padding: 0.85rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    position: relative;
}

@media (min-width: 40em) {
    .row {
        grid-template-columns: 2fr 1fr 1.2fr auto;
        align-items: end;
        padding-inline-end: 0.85rem;
    }
}

.row__field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.row__label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.row__remove {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-sm);
    color: var(--color-text-faint);
    transition: background-color var(--transition-fast), color var(--transition-fast);
    justify-self: start;
}

@media (min-width: 40em) {
    .row__remove {
        justify-self: end;
    }
}

.row__remove:hover {
    background: var(--color-error-soft);
    color: var(--color-error);
}

.row__remove svg {
    width: 1.1rem;
    height: 1.1rem;
}

.rows-add {
    align-self: flex-start;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2.75rem;
    padding: 0.4rem 1rem;
    border: 1px dashed var(--color-border-strong);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.rows-add:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.rows-add svg {
    width: 1.1rem;
    height: 1.1rem;
}

/* ---------- Actions ---------- */

.calc-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1.5rem;
}

.calc-actions .btn {
    flex: 1 1 12rem;
}

/* ---------- Result ---------- */

.result-box {
    margin-top: 1.5rem;
    border: 1px solid var(--color-primary-border);
    background: var(--color-primary-soft);
    border-radius: var(--radius-lg);
    padding: 1.25rem clamp(1rem, 3vw, 1.5rem) 1.35rem;
    animation: result-in 180ms ease;
}

@keyframes result-in {
    from {
        opacity: 0;
        transform: translateY(4px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

.result-main {
    text-align: center;
    padding-bottom: 1rem;
}

.result-main__label {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary-active);
    margin-bottom: 0.35rem;
}

html[lang="ar"] .result-main__label {
    letter-spacing: 0;
}

.result-main__value {
    display: inline-block;
    font-size: clamp(2rem, 6vw, 2.7rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-primary-active);
    line-height: 1.15;
    font-variant-numeric: tabular-nums;
    direction: ltr;
    unicode-bidi: isolate;
    overflow-wrap: anywhere;
}

.result-main__suffix {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
    direction: ltr;
    unicode-bidi: isolate;
}

.result-rows {
    margin: 0;
    border-top: 1px solid var(--color-primary-border);
    padding-top: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.result-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}

.result-row dt {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.result-row dd {
    margin: 0;
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    direction: ltr;
    unicode-bidi: isolate;
    text-align: end;
}

.result-note {
    margin-top: 0.9rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--color-primary-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

.result-table-wrap {
    margin-top: 0.9rem;
}

.result-table-wrap > summary {
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary-active);
    padding: 0.35rem 0;
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.result-table-wrap > summary::-webkit-details-marker {
    display: none;
}

.result-table-wrap > summary::before {
    content: "+";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.3rem;
    height: 1.3rem;
    border: 1px solid var(--color-primary-border);
    border-radius: 50%;
    font-weight: 700;
}

.result-table-wrap[open] > summary::before {
    content: "−";
}

.result-table {
    margin-top: 0.6rem;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    font-size: 0.875rem;
}

.result-table caption {
    text-align: start;
    font-weight: 600;
    padding: 0.6rem 0.8rem;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}

.result-table th,
.result-table td {
    padding: 0.5rem 0.8rem;
    text-align: start;
    border-bottom: 1px solid var(--color-border);
    font-variant-numeric: tabular-nums;
}

.result-table td {
    direction: ltr;
    unicode-bidi: isolate;
    text-align: end;
}

.result-table thead th {
    background: var(--color-surface);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.result-table tbody tr:last-child td {
    border-bottom: 0;
}

/* ---------- Status messages (unreachable goals etc.) ---------- */

.result-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--color-warning);
    font-size: 0.95rem;
}

.result-status svg {
    width: 1.2rem;
    height: 1.2rem;
    flex: 0 0 auto;
}