/* ============================================================
   Keyrate Calculator (calc_keyrate)
   Extracted from style.css (CSS refactor Step 4)
   ============================================================ */

/* ===== Keyrate Display ===== */
.keyrate-display {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark, #002255));
    border-radius: 16px;
    padding: 24px 28px;
    color: #fff;
    margin-bottom: 16px;
}
.keyrate-display__header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.keyrate-display__label {
    font-size: 0.95rem;
    opacity: 0.85;
}
.keyrate-display__value {
    font-size: 2.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.keyrate-display__value .copy-hint svg { stroke: rgba(255,255,255,0.7); }
.keyrate-display__meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    font-size: 0.88rem;
    opacity: 0.8;
}
.keyrate-display__badge {
    font-size: 0.78rem;
    padding: 2px 10px;
    border-radius: 20px;
    font-weight: 500;
}
.keyrate-display__badge--live {
    background: rgba(40, 167, 69, 0.3);
    color: #90ffb0;
}
.keyrate-display__badge--fallback {
    background: rgba(255, 193, 7, 0.3);
    color: #ffe082;
}
.keyrate-refresh {
    color: rgba(255,255,255,0.8);
    border: 1px solid rgba(255,255,255,0.25);
}
.keyrate-refresh:hover {
    color: #fff;
    border-color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.1);
}

/* ===== Keyrate Bar Chart ===== */
.keyrate-chart {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 16px;
}
.keyrate-chart__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}
.keyrate-chart__title {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
}

.keyrate-chart__bars {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 80px;
    padding-top: 20px;
    position: relative;
}
.keyrate-chart__sparkline {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}
.keyrate-chart__bar-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 0;
    z-index: 1;
}
.keyrate-chart__bar {
    width: 100%;
    border-radius: 4px 4px 0 0;
    background: var(--bar-color, var(--primary-light));
    height: var(--bar-height, 12px);
    min-height: 12px;
    position: relative;
    opacity: 0.75;
    transform-origin: bottom;
    animation: keyrateBarGrow 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--bar-index, 0) * 0.06s);
}
@keyframes keyrateBarGrow {
    from { transform: scaleY(0); opacity: 0; }
    to { transform: scaleY(1); opacity: 0.75; }
}
.keyrate-chart__bar-item--current .keyrate-chart__bar {
    opacity: 1;
    box-shadow: 0 -2px 10px rgba(var(--primary-rgb, 0,90,200), 0.4);
    animation-name: keyrateBarGrowCurrent;
}
@keyframes keyrateBarGrowCurrent {
    from { transform: scaleY(0); opacity: 0; }
    to { transform: scaleY(1); opacity: 1; }
}
.keyrate-chart__bar-label {
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-main);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
.keyrate-chart__bar-date {
    font-size: 0.68rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ===== Keyrate Compare (result) ===== */
.keyrate-compare {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    margin-bottom: 16px;
}
.keyrate-compare__col {
    flex: 1;
    padding: 18px 20px;
    text-align: center;
}
.keyrate-compare__col--annuity {
    background: linear-gradient(135deg, rgba(var(--primary-rgb, 0,90,200), 0.06), transparent);
}
.keyrate-compare__divider {
    width: 1px;
    background: var(--border-subtle);
}
.keyrate-compare__type {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.keyrate-compare__main {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
    cursor: pointer;
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
}
.keyrate-compare__main .copy-hint { align-self: center; }
.keyrate-compare__cur {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-muted);
}
.keyrate-compare__range {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
}
.keyrate-compare__arrow {
    color: var(--text-muted);
    font-weight: 400;
    margin: 0 4px;
    font-size: 0.9rem;
}
.keyrate-compare__details {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.keyrate-compare__overpay {
    color: var(--danger, #dc3545);
}
.keyrate-compare__details strong {
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
}

/* ===== Dark theme ===== */
[data-theme="dark"] .keyrate-display {
    background: linear-gradient(135deg, var(--primary), #0a1e3d);
}
[data-theme="dark"] .keyrate-chart {
    background: var(--bg-card);
    border-color: var(--border-subtle);
}
[data-theme="dark"] .keyrate-chart__bar {
    background: linear-gradient(to top, rgba(255,255,255,0.08), transparent), var(--bar-color, rgba(74,144,217,0.6));
}
[data-theme="dark"] .keyrate-compare {
    background: var(--bg-card);
    border-color: var(--border-subtle);
}
[data-theme="dark"] .keyrate-compare__col--annuity {
    background: linear-gradient(135deg, rgba(var(--primary-rgb, 0,90,200), 0.12), transparent);
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
    .keyrate-display {
        padding: 16px 18px;
    }
    .keyrate-display__value {
        font-size: 2rem;
    }
    .keyrate-chart__bars {
        height: 60px;
        gap: 3px;
    }
    .keyrate-chart__bar-label {
        font-size: 0.65rem;
        top: -15px;
    }
    .keyrate-chart__bar-date {
        font-size: 0.6rem;
    }
    .keyrate-compare {
        flex-direction: column;
    }
    .keyrate-compare__divider {
        width: auto;
        height: 1px;
    }
    .keyrate-compare__main {
        font-size: 1.3rem;
    }
    .keyrate-compare__range {
        font-size: 1rem;
    }
    .keyrate-compare__details {
        flex-direction: column;
        gap: 4px;
    }
}

/* ===== Keyrate Payments Chart ===== */
.keyrate-payments-chart {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 16px 18px;
    margin-bottom: 16px;
}
.keyrate-payments-chart__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}
.keyrate-payments-chart__title {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-main);
}
.keyrate-payments-chart__legend {
    display: flex;
    gap: 12px;
    align-items: center;
}
.keyrate-payments-chart__legend-item {
    font-size: 0.75rem;
    color: var(--text-muted);
    position: relative;
    padding-left: 16px;
}
.keyrate-payments-chart__legend-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 3px;
    border-radius: 2px;
}
.keyrate-payments-chart__legend-item--annuity::before {
    background: var(--primary);
}
.keyrate-payments-chart__legend-item--diff::before {
    background: var(--danger);
}
.keyrate-payments-chart__body {
    width: 100%;
    position: relative;
}
.keyrate-payments-chart__svg {
    width: 100%;
    height: 180px;
    display: block;
    overflow: visible;
}
.keyrate-payments-chart__line {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke-width 0.2s ease;
}
.keyrate-payments-chart__line--annuity {
    stroke: var(--primary);
}
.keyrate-payments-chart__line--diff {
    stroke: var(--danger);
}
.keyrate-payments-chart__dot {
    transition: opacity 0.2s ease, r 0.2s ease;
    cursor: pointer;
}
.keyrate-payments-chart__dot--annuity { fill: var(--primary); }
.keyrate-payments-chart__dot--diff { fill: var(--danger); }
.keyrate-payments-chart__stop--annuity { stop-color: var(--primary); }
.keyrate-payments-chart__stop--diff { stop-color: var(--danger); }
.keyrate-payments-chart__grid-line { stroke: var(--border-subtle); }
.keyrate-payments-chart__axis-label { fill: var(--text-muted); }
.keyrate-payments-chart__body:hover .keyrate-payments-chart__dot {
    opacity: 0.85 !important;
}
.keyrate-payments-chart__body:hover .keyrate-payments-chart__line {
    stroke-width: 3.5;
}
.keyrate-payments-chart__hint {
    display: flex;
    gap: 12px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.78rem;
    line-height: 1.5;
    color: var(--text-muted);
}
.keyrate-payments-chart__hint-col {
    flex: 1;
}
.keyrate-payments-chart__hint-col strong {
    color: var(--text-main);
    font-weight: 600;
}
.keyrate-payments-chart__hint-divider {
    width: 1px;
    background: var(--border-subtle);
    flex-shrink: 0;
}

/* Dark theme */
[data-theme="dark"] .keyrate-payments-chart {
    background: var(--bg-card);
    border-color: var(--border-subtle);
}
[data-theme="dark"] .keyrate-payments-chart__line--annuity {
    stroke: rgba(var(--primary-rgb, 0,90,200), 0.9);
}
[data-theme="dark"] .keyrate-payments-chart__line--diff {
    stroke: rgba(var(--error-rgb), 0.9);
}

/* Mobile */
@media (max-width: 768px) {
    .keyrate-payments-chart__svg {
        height: 140px;
    }
    .keyrate-payments-chart__header {
        flex-direction: column;
        align-items: flex-start;
    }
    .keyrate-payments-chart__legend {
        gap: 10px;
    }
    .keyrate-payments-chart__hint {
        flex-direction: column;
        gap: 8px;
    }
    .keyrate-payments-chart__hint-divider {
        width: auto;
        height: 1px;
    }
}