/* ═══════════════════════════════════════════════════════════════════════════
 * interest-rate.css — Interest Rate Calculator
 * All selectors namespaced with .irc-* to avoid conflicts.
 * Depends on site-wide CSS variables defined in :root (color-scheme.md).
 * ═══════════════════════════════════════════════════════════════════════════ */

/* ── WIDGET WRAPPER ─────────────────────────────────────────────────────── */

.irc-wrap {
    font-family: inherit;
    color: var(--clr-text-primary);
}

/* ── TABS ───────────────────────────────────────────────────────────────── */

.irc-tabs {
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--clr-border);
    margin-bottom: 1.5rem;
}

.irc-tab {
    position: relative;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--clr-text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
    white-space: nowrap;
}

.irc-tab::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--clr-accent);
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.irc-tab:hover {
    color: var(--clr-accent-dark);
}

.irc-tab--active {
    color: var(--clr-accent-dark);
}

.irc-tab--active::after {
    transform: scaleX(1);
}

/* ── PANELS ─────────────────────────────────────────────────────────────── */

.irc-panel {
    display: block;
}

.irc-panel[hidden] {
    display: none;
}

/* ── INPUT GRID ─────────────────────────────────────────────────────────── */

.irc-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 1.25rem;
}

@media (max-width: 600px) {
    .irc-inputs {
        grid-template-columns: 1fr;
    }
}

/* ── INDIVIDUAL FIELD ───────────────────────────────────────────────────── */

.irc-field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.irc-label {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--clr-text-primary);
    line-height: 1.3;
}

.irc-hint {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--clr-text-muted);
    background: var(--clr-bg-muted);
    padding: 0.1rem 0.45rem;
    border-radius: 4px;
    letter-spacing: 0.01em;
}

.irc-input-wrap {
    display: flex;
    align-items: center;
    border: 1.5px solid var(--clr-border);
    border-radius: 8px;
    background: var(--clr-bg);
    overflow: hidden;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.irc-input-wrap:focus-within {
    border-color: var(--clr-accent);
    box-shadow: var(--shadow-focus);
}

.irc-prefix,
.irc-suffix {
    padding: 0 0.625rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--clr-text-muted);
    background: var(--clr-bg-soft);
    align-self: stretch;
    display: flex;
    align-items: center;
    border-right: 1.5px solid var(--clr-border);
    user-select: none;
    white-space: nowrap;
}

.irc-suffix {
    border-right: none;
    border-left: 1.5px solid var(--clr-border);
}

.irc-input {
    flex: 1;
    min-width: 0;
    padding: 0.5rem 0.625rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--clr-text-primary);
    background: transparent;
    border: none;
    outline: none;
    -moz-appearance: textfield;
}

.irc-input::-webkit-outer-spin-button,
.irc-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Select */
.irc-input-wrap--select {
    position: relative;
    cursor: pointer;
}

.irc-select {
    flex: 1;
    min-width: 0;
    padding: 0.5rem 2rem 0.5rem 0.625rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--clr-text-primary);
    background: transparent;
    border: none;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    width: 100%;
}

.irc-select-chevron {
    position: absolute;
    right: 0.625rem;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--clr-text-muted);
    flex-shrink: 0;
}

.irc-desc {
    font-size: 0.72rem;
    color: var(--clr-text-muted);
    line-height: 1.4;
}

/* ── ACTION BUTTONS ─────────────────────────────────────────────────────── */

.irc-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.irc-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.6rem 1.35rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    border: 1.5px solid transparent;
    transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease,
                box-shadow 0.18s ease, transform 0.12s ease;
    white-space: nowrap;
    line-height: 1;
}

.irc-btn:active {
    transform: translateY(1px);
}

.irc-btn--primary {
    background: var(--clr-accent);
    color: #fff;
    border-color: var(--clr-accent);
}

.irc-btn--primary:hover {
    background: var(--clr-accent-dark);
    border-color: var(--clr-accent-dark);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.irc-btn--ghost {
    background: var(--clr-bg-muted);
    color: var(--clr-text-secondary);
    border-color: var(--clr-border);
}

.irc-btn--ghost:hover {
    background: var(--clr-bg-soft);
    color: var(--clr-text-primary);
    border-color: var(--clr-text-muted);
}

/* ── RESULTS SECTION ────────────────────────────────────────────────────── */

.irc-results {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1.5px solid var(--clr-border-soft);
    animation: irc-fade-in 0.3s ease;
}

.irc-results[hidden] {
    display: none;
}

@keyframes irc-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Result grids */
.irc-results-grid {
    display: grid;
    gap: 0.875rem;
}

.irc-results-grid--3 {
    grid-template-columns: repeat(3, 1fr);
}

.irc-results-grid--4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 700px) {
    .irc-results-grid--3 {
        grid-template-columns: 1fr 1fr;
    }
    .irc-results-grid--4 {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 400px) {
    .irc-results-grid--3,
    .irc-results-grid--4 {
        grid-template-columns: 1fr;
    }
}

/* Result cards */
.irc-result-card {
    background: var(--clr-bg-soft);
    border: 1.5px solid var(--clr-border);
    border-radius: 10px;
    padding: 0.875rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    transition: border-color 0.2s ease;
}

.irc-result-card--primary {
    background: var(--clr-accent-light);
    border-color: var(--clr-accent);
}

.irc-result-label {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--clr-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    line-height: 1.3;
}

.irc-result-card--primary .irc-result-label {
    color: var(--clr-accent-dark);
}

.irc-result-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--clr-text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.irc-result-card--primary .irc-result-value {
    color: var(--clr-accent-dark);
    font-size: 1.4rem;
}

/* ── BREAKDOWN BAR ──────────────────────────────────────────────────────── */

.irc-breakdown {
    margin-top: 1.25rem;
}

.irc-breakdown-label {
    font-size: 0.775rem;
    font-weight: 600;
    color: var(--clr-text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.irc-bar {
    display: flex;
    height: 10px;
    border-radius: 6px;
    overflow: hidden;
    background: var(--clr-bg-muted);
}

.irc-bar__principal {
    background: var(--clr-accent);
    height: 100%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 0;
}

.irc-bar__contrib {
    background: var(--clr-teal);
    height: 100%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 0;
}

.irc-bar__interest {
    background: var(--clr-interest);
    height: 100%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 0;
}

.irc-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    margin-top: 0.625rem;
}

.irc-legend__item {
    font-size: 0.775rem;
    font-weight: 500;
    color: var(--clr-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.irc-legend__item::before {
    content: '';
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 3px;
    flex-shrink: 0;
}

.irc-legend__item--principal::before { background: var(--clr-accent); }
.irc-legend__item--contrib::before   { background: var(--clr-teal); }
.irc-legend__item--interest::before  { background: var(--clr-interest); }

/* ── FORMULA NOTE ───────────────────────────────────────────────────────── */

.irc-formula-note {
    margin-top: 1rem;
    padding: 0.625rem 0.875rem;
    background: var(--clr-bg-muted);
    border-left: 3px solid var(--clr-teal);
    border-radius: 0 6px 6px 0;
    font-size: 0.775rem;
    color: var(--clr-text-secondary);
    line-height: 1.6;
}

.irc-formula-note:empty {
    display: none;
}

.irc-formula-note code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.82rem;
    color: var(--clr-accent-dark);
    background: var(--clr-accent-light);
    padding: 0.1em 0.35em;
    border-radius: 3px;
}

/* ── SCHEDULE TOGGLE ────────────────────────────────────────────────────── */

.irc-schedule-wrap {
    margin-top: 1.125rem;
    border: 1.5px solid var(--clr-border);
    border-radius: 10px;
    overflow: hidden;
}

.irc-schedule-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--clr-text-secondary);
    background: var(--clr-bg-soft);
    border: none;
    cursor: pointer;
    transition: color 0.18s ease, background 0.18s ease;
    gap: 0.5rem;
}

.irc-schedule-toggle:hover {
    background: var(--clr-accent-light);
    color: var(--clr-accent-dark);
}

.irc-chevron {
    flex-shrink: 0;
    color: var(--clr-text-muted);
    transition: transform 0.25s ease;
}

.irc-schedule-toggle[aria-expanded="true"] .irc-chevron {
    transform: rotate(180deg);
}

.irc-schedule-body {
    border-top: 1.5px solid var(--clr-border);
}

.irc-schedule-body[hidden] {
    display: none;
}

/* ── TABLE ──────────────────────────────────────────────────────────────── */

.irc-table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.irc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    min-width: 380px;
}

.irc-table thead tr {
    background: var(--clr-bg-muted);
}

.irc-table th {
    padding: 0.55rem 0.875rem;
    text-align: right;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--clr-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
    border-bottom: 1.5px solid var(--clr-border);
}

.irc-table th:first-child {
    text-align: left;
}

.irc-table td {
    padding: 0.5rem 0.875rem;
    text-align: right;
    color: var(--clr-text-primary);
    font-weight: 500;
    border-bottom: 1px solid var(--clr-border-soft);
}

.irc-table td:first-child {
    text-align: left;
    font-weight: 700;
    color: var(--clr-accent-dark);
}

.irc-table tbody tr:last-child td {
    border-bottom: none;
}

.irc-table tbody tr:nth-child(even) td {
    background: var(--clr-bg-soft);
}

.irc-table tbody tr:hover td {
    background: var(--clr-accent-light);
}

.irc-table .irc-table-total td {
    font-weight: 700;
    background: var(--clr-bg-muted) !important;
    border-top: 1.5px solid var(--clr-border);
    color: var(--clr-text-primary);
}

.irc-table .irc-table-total td:first-child {
    color: var(--clr-text-primary);
}

/* ── ARTICLE LIST ───────────────────────────────────────────────────────── */

.irc-article-list {
    list-style: none;
    padding: 0;
    margin: 0.75rem 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.irc-article-list li {
    padding: 0.5rem 0.875rem;
    background: var(--clr-bg-soft);
    border-left: 3px solid var(--clr-accent);
    border-radius: 0 6px 6px 0;
    font-size: 0.875rem;
    color: var(--clr-text-secondary);
    line-height: 1.5;
}

.irc-article-list li strong {
    color: var(--clr-text-primary);
}

/* ── VALIDATION ERROR ───────────────────────────────────────────────────── */

.irc-input-wrap--error {
    border-color: #ef4444 !important;
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12) !important;
}

.irc-error-msg {
    font-size: 0.72rem;
    color: #dc2626;
    margin-top: 0.1rem;
}

/* ── RESPONSIVE ─────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
    .irc-tab {
        padding: 0.5rem 0.875rem;
        font-size: 0.8125rem;
    }

    .irc-btn {
        padding: 0.55rem 1rem;
        font-size: 0.8125rem;
    }

    .irc-result-value {
        font-size: 1.1rem;
    }

    .irc-result-card--primary .irc-result-value {
        font-size: 1.2rem;
    }

    .irc-legend {
        gap: 0.4rem 0.75rem;
    }
}

@media (max-width: 360px) {
    .irc-tabs {
        gap: 0;
    }

    .irc-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.775rem;
    }
}