/* Calculator Styles */

.calculator-overlay {
    position: fixed;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: transparent;
    z-index: 3000;
    pointer-events: none;
}

.calculator-overlay.open {
    display: flex;
}

.calculator-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.calculator {
    background: #f8fafc;
    border-radius: 20px;
    width: 450px;
    max-width: 90vw;
    overflow: hidden;
    border: 1px solid #d3dae4;
    font-size: 15px;
    scrollbar-width: auto;
    scrollbar-color: #b8c3d3 #e7edf4;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    pointer-events: auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    position: relative;
    z-index: 1;
}

.calculator::-webkit-scrollbar {
    width: 12px;
}

.calculator::-webkit-scrollbar-thumb {
    background: #b8c3d3;
    border-radius: 10px;
}

.calculator::-webkit-scrollbar-track {
    background: #e7edf4;
}

.calculator .display {
    background: linear-gradient(135deg, #0b3e5c 0%, #165a7a 100%);
    padding: 16px 18px 12px 18px;
    color: white;
    position: relative;
    touch-action: none;
    cursor: move;
    user-select: none;
    -webkit-user-select: none;
}

.calculator .display * {
    user-select: none;
    -webkit-user-select: none;
}

.calculator.dragging,
.calculator.dragging * {
    cursor: move !important;
}

.calculator .result-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.calculator .result-display {
    flex: 1;
    font-size: 24px;
    font-weight: 300;
    min-height: 36px;
    text-align: right;
    word-wrap: break-word;
    font-family: 'Segoe UI', 'Segoe UI Symbol', 'Courier New', Courier, monospace;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    line-height: 1.1;
}

.calculator .result-display.updated {
    animation: resultPulse 360ms ease;
}

@keyframes resultPulse {

    0%,
    100% {
        transform: scale(1);
        text-shadow: 0 0 0 rgba(255, 255, 255, 0);
    }

    45% {
        transform: scale(1.04);
        text-shadow: 0 0 12px rgba(255, 255, 255, 0.7);
    }
}

.calculator .copy-result {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.9);
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    cursor: pointer;
    padding: 0;
    position: relative;
    transition: color 0.15s;
}

.calculator .copy-result svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.calculator .copy-result:hover {
    color: #ffffff;
}

.calculator .copy-check {
    position: absolute;
    right: -3px;
    bottom: -3px;
    font-size: 11px;
    line-height: 1;
    color: #0f6b3a;
    background: #ffffff;
    border: 1px solid rgba(15, 107, 58, 0.35);
    border-radius: 999px;
    padding: 2px 3px;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}

.calculator .copy-result.copied .copy-check {
    opacity: 1;
    transform: scale(1);
}

.calculator .main-input {
    background: white;
    padding: 6px;
    border-bottom: 1px solid #c3cedb;
}

.calculator .main-input input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid #9fb0c4;
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
    font-weight: normal;
    background: #ffffff;
    color: #0b0f16;
    transition: border-color 0.15s;
}

.calculator .main-input input:focus {
    outline: 1px solid #2f6f91;
    border-color: #2f6f91;
    background: #eef6fb;
}

.calculator-container .popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: transparent;
    z-index: 100;
    display: none;
    pointer-events: none !important;
}

.calculator-container .popup-overlay.open {
    display: block;
}

.calculator-container .popup {
    position: fixed;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    z-index: 200;
    width: 360px;
    max-width: 90vw;
    max-height: 80vh;
    overflow: auto;
    display: none;
    pointer-events: auto;
}

.calculator-container .popup.open {
    display: block;
}

.calculator-container .popup-drag-handle {
    background: linear-gradient(135deg, #0b3e5c 0%, #165a7a 100%);
    height: 32px;
    border-radius: 12px 12px 0 0;
    cursor: move;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
    touch-action: none;
    -webkit-touch-callout: none;
}

.calculator-container .popup.dragging,
.calculator-container .popup.dragging * {
    cursor: move !important;
}

.calculator-container .popup-close {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 16px;
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    line-height: 1;
}

.calculator-container .popup-close:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-50%);
}

.calculator-container .popup-close:active {
    background: rgba(255, 255, 255, 0.5);
    transform: translateY(-50%);
}

.calculator-container .popup-content {
    padding: 10px;
    background: #cdd6e2;
    /* Match calculator background */
}

.calculator-container .popup-actions {
    padding: 6px 10px 10px 10px;
    display: flex;
    gap: 6px;
    background: #cdd6e2;
    /* Match calculator background */
}

.calculator-container .popup-actions button {
    flex: 1;
    padding: 6px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
}

.calculator-container .popup-actions .btn-primary {
    background: #2f9d6a;
    color: white;
}

.calculator-container .popup-actions .btn-primary:hover {
    background: #278459;
}

.calculator-container .popup-actions .btn-secondary {
    background: #e7edf4;
    color: #111827;
}

.calculator-container .popup-actions .btn-secondary:hover {
    background: #cdd6e2;
}

.calculator-container .input-row {
    display: flex;
    gap: 1px;
    margin-bottom: 2px;
    align-items: center;
    flex-wrap: wrap;
}

.calculator-container .input-row input {
    width: 38px;
    padding: 6px 8px;
    text-align: center;
    border: 1px solid #9fb0c4;
    border-radius: 6px;
    font-size: 15px;
    font-family: inherit;
    font-weight: normal;
    background: #ffffff;
    color: #0b0f16;
    transition: border-color 0.15s;
    margin: 0;
}

.calculator-container .input-row input:focus {
    outline: 1px solid #2f6f91;
    border-color: #2f6f91;
    background: #eef6fb;
}

.calculator-container .binom-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 4px;
}

.calculator-container .binom-field {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.calculator-container .binom-field label {
    font-size: 12px;
}

.calculator-container .binom-input {
    display: flex;
    align-items: center;
    gap: 2px;
}

.calculator-container .binom-input input {
    width: 52px;
    min-width: 0;
    padding: 6px 8px;
    font-size: 15px;
    border: 1px solid #9fb0c4;
    border-radius: 6px;
    background: #ffffff;
    color: #0b0f16;
    transition: border-color 0.15s;
    text-align: left;
    margin: 0;
    font-weight: normal;
}

.calculator-container .binom-input input:focus {
    outline: 1px solid #2f6f91;
    border-color: #2f6f91;
    background: #eef6fb;
}

.calculator-container .binom-stepper {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.calculator-container .binom-step {
    width: 28px;
    height: 14px;
    padding: 0;
    border-radius: 4px;
    font-size: 10px;
    line-height: 1;
    border: 1px solid #b8c3d3;
    background: #f4f7fb;
    color: #111827;
    cursor: pointer;
    transition: background-color 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator-container .binom-step:hover {
    background: #e7eef7;
}

.calculator-container .panel-label {
    color: #374151;
    font-weight: 500;
    font-size: 12px;
}

.calculator-container .lgs-operator,
.calculator-container .lgs-var-label,
.calculator-container .lgs-equals {
    padding: 0 1px;
    font-weight: 500;
    color: #374151;
    font-size: 12px;
}

.calculator-container .lgs-matrix {
    margin-bottom: 2px;
}

.calculator-container .lgs-controls {
    display: flex;
    gap: 3px;
    margin-bottom: 8px;
}

.calculator-container .lgs-controls button {
    flex: 1;
    padding: 5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    background: #48bb78;
    color: white;
    transition: background-color 0.15s;
    font-weight: 600;
    font-size: 13px;
}

.calculator-container .lgs-controls button:hover {
    background: #38a169;
}

.calculator-container .lgs-controls button.remove {
    background: #f56565;
}

.calculator-container .lgs-controls button.remove:hover {
    background: #e53e3e;
}

.calculator input[type=number] {
    appearance: textfield;
}

.calculator input[type=number]::-webkit-outer-spin-button,
.calculator input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.calculator .buttons {
    padding: 8px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    background: #cdd6e2;
}

.calculator button {
    padding: 0 8px;
    height: 36px;
    /* Fixed button height for uniform rows */
    font-size: inherit;
    border: 1px solid #b8c3d3;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 500;
    background: #f4f7fb;
    color: #111827;
    line-height: 1;
    /* Tight line height to avoid extra vertical space */
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.calculator button:hover {
    transform: translateY(-1px);
    background: #e7eef7;
}

.calculator button:active {
    transform: translateY(0);
}

.calculator .operator {
    background: #14537a;
    color: white;
}

.calculator .operator:hover {
    background: #0f3f5d;
}

.calculator .equals {
    background: #2f9d6a;
    color: white;
}

.calculator .equals:hover {
    background: #278459;
}

.calculator .clear {
    background: #e35656;
    color: white;
}

.calculator .clear:hover {
    background: #cc4242;
}

.calculator .key-popover {
    position: relative;
    display: flex;
}

.calculator .key-popover>button {
    width: 100%;
}

.calculator .key-popover-menu {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 6px);
    background: #cdd6e2;
    border: 1px solid #b8c3d3;
    border-radius: 10px;
    padding: 6px;
    display: none;
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    z-index: 5;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.18);
}

.calculator .key-popover.open .key-popover-menu {
    display: grid;
}

.calculator .key-popover-menu button {
    padding: 6px 4px;
    font-weight: 600;
}

/* Popup menu buttons (const, tri/log) styled like digit buttons */
.calculator-container .popup-content .const-menu,
.calculator-container .popup-content .tri-menu {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 4px;
}

.calculator-container .popup-content .const-menu button,
.calculator-container .popup-content .tri-menu button {
    padding: 0 8px;
    height: 36px;
    /* Match calculator button height */
    font-size: inherit;
    border: 1px solid #b8c3d3;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 500;
    background: #f4f7fb;
    color: #111827;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.calculator-container .popup-content .const-menu button:hover,
.calculator-container .popup-content .tri-menu button:hover {
    transform: translateY(-1px);
    background: #e7eef7;
}

.calculator-container .popup-content .const-menu button:active,
.calculator-container .popup-content .tri-menu button:active {
    transform: translateY(0);
}

@media (max-width: 600px) {
    .calculator .result-display {
        font-size: 30px;
    }

    .calculator button {
        padding: 0 7px;
        /* Keep fixed height, reduce horizontal padding on small screens */
    }

    .calculator-container .binom-input input,
    .calculator-container .input-row input {
        margin: 0;
    }
}