* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0071e3;
    --secondary-color: #86868b;
    --background-color: #f5f5f7;
    --surface-color: #ffffff;
    --text-color: #1d1d1f;
    --border-color: #d2d2d7;
    --hover-color: #0077ed;
    --active-color: #0051d5;
    --error-color: #ff3b30;
    --success-color: #34c759;
    --warning-color: #ff9500;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

body.dark {
    --background-color: #000000;
    --surface-color: #1c1c1e;
    --text-color: #ffffff;
    --border-color: #38383a;
    --secondary-color: #98989d;
}

.calculator {
    width: 100%;
    max-width: 800px;
    background-color: var(--surface-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* Header */
.calc-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-title {
    font-size: 24px;
    font-weight: 600;
}

.header-controls {
    display: flex;
    gap: 10px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    color: var(--secondary-color);
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

/* Display */
.calc-display {
    padding: 30px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.display-history {
    font-size: 14px;
    color: var(--secondary-color);
    min-height: 20px;
    text-align: right;
}

.display-main {
    font-size: 48px;
    font-weight: 300;
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.display-info {
    font-size: 12px;
    color: var(--secondary-color);
    text-align: right;
    margin-top: 5px;
}

/* Tabs */
.calc-tabs {
    display: flex;
    overflow-x: auto;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    -webkit-overflow-scrolling: touch;
}

.tab {
    padding: 12px 20px;
    border: none;
    background: none;
    color: var(--secondary-color);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
    position: relative;
}

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

.tab.active {
    color: var(--primary-color);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

/* Calculator Body */
.calc-body {
    display: none;
    padding: 20px;
    min-height: 400px;
}

.calc-body.active {
    display: block;
}

/* Button Grid */
.btn-grid {
    display: grid;
    gap: 10px;
}

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

.sci-grid {
    grid-template-columns: repeat(5, 1fr);
}

.prog-grid {
    grid-template-columns: repeat(5, 1fr);
}

/* Buttons */
.btn {
    padding: 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 20px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--background-color);
    color: var(--text-color);
}

.btn:hover {
    transform: scale(0.98);
    opacity: 0.8;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-func {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    font-size: 16px;
}

.btn-zero {
    grid-column: span 2;
}

.btn-zero-sci {
    grid-column: span 2;
}

.btn-zero-prog {
    grid-column: span 3;
}

.btn-equals-sci {
    grid-column: span 2;
}

.btn-equals-prog {
    grid-column: span 2;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

.btn-calc {
    width: 100%;
    margin-top: 20px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Side Panels */
.side-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100%;
    background-color: var(--surface-color);
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    transition: right 0.3s ease;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

.side-panel.active {
    right: 0;
}

.panel-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.panel-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.close-btn {
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--secondary-color);
}

/* History */
.history-item {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    background-color: var(--background-color);
}

.history-expr {
    font-size: 14px;
    color: var(--secondary-color);
}

.history-result {
    font-size: 18px;
    font-weight: 500;
    margin: 5px 0;
}

.history-time {
    font-size: 12px;
    color: var(--secondary-color);
}

.history-empty {
    text-align: center;
    color: var(--secondary-color);
    padding: 40px 0;
}

/* Settings */
.settings-section {
    margin-bottom: 30px;
}

.settings-section h3 {
    font-size: 18px;
    margin-bottom: 15px;
}

.setting-item {
    margin-bottom: 15px;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.setting-item input[type="number"],
.setting-item select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--background-color);
    margin-top: 5px;
}

/* Converter */
.converter-container {
    max-width: 600px;
    margin: 0 auto;
}

.conv-categories {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.conv-cat {
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.conv-cat:hover {
    border-color: var(--primary-color);
}

.conv-cat.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.conv-inputs {
    display: flex;
    align-items: center;
    gap: 20px;
}

.conv-input-group {
    flex: 1;
}

.conv-input,
.conv-select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    margin-top: 10px;
}

.swap-btn {
    width: 50px;
    height: 50px;
    border: none;
    background-color: var(--background-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.swap-btn:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Financial */
.fin-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.fin-tab {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    background-color: var(--background-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.fin-tab:hover {
    border-color: var(--primary-color);
}

.fin-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.fin-content {
    display: none;
}

.fin-content.active {
    display: block;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--secondary-color);
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
}

.result-container {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item.highlight {
    font-weight: 600;
    color: var(--primary-color);
}

/* Currency */
.currency-inputs {
    display: flex;
    align-items: center;
    gap: 20px;
}

.currency-group {
    flex: 1;
}

.currency-input,
.currency-select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    margin-top: 10px;
}

.exchange-rate {
    text-align: center;
    margin-top: 20px;
    color: var(--secondary-color);
}

/* Matrix */
.matrix-container {
    max-width: 700px;
    margin: 0 auto;
}

.matrix-input {
    margin-bottom: 30px;
}

.matrix-input h3 {
    margin-bottom: 10px;
}

.matrix-size {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.matrix-size input {
    width: 60px;
    padding: 5px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
}

.matrix-grid {
    display: grid;
    gap: 5px;
    margin-bottom: 20px;
}

.matrix-cell {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    text-align: center;
    font-size: 14px;
}

.matrix-operations {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 30px;
}

.matrix-result {
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.matrix-result-cell {
    padding: 10px;
    text-align: center;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.matrix-scalar {
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    padding: 20px;
}

/* Statistics */
.stat-container {
    max-width: 700px;
    margin: 0 auto;
}

.stat-input {
    margin-bottom: 30px;
}

.stat-input h3 {
    margin-bottom: 10px;
}

.stat-input textarea {
    width: 100%;
    height: 150px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    resize: vertical;
}

.stat-results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-section {
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.stat-section h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-chart {
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.stat-chart h4 {
    margin-bottom: 15px;
}

#histogramCanvas {
    width: 100%;
    height: 300px;
}

/* Graph */
.graph-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
    height: 600px;
}

.graph-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.graph-functions,
.graph-range {
    padding: 20px;
    background-color: var(--background-color);
    border-radius: var(--radius);
}

.graph-functions h4,
.graph-range h4 {
    margin-bottom: 15px;
}

.func-input {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.func-input input[type="color"] {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.func-input input[type="text"] {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.range-inputs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.range-input {
    display: flex;
    flex-direction: column;
}

.range-input label {
    font-size: 12px;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.range-input input {
    padding: 6px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.graph-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.graph-canvas-container {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

#graphCanvas {
    max-width: 100%;
    max-height: 100%;
}

/* Programmer */
.prog-display {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.base-display {
    padding: 15px;
    background-color: var(--background-color);
    border-radius: 8px;
}

.base-label {
    font-size: 12px;
    color: var(--secondary-color);
    display: block;
    margin-bottom: 5px;
}

.base-value {
    font-size: 18px;
    font-family: 'Courier New', monospace;
    word-break: break-all;
}

.prog-controls {
    margin-bottom: 20px;
}

.btn-group {
    display: flex;
    gap: 5px;
}

.base-btn {
    flex: 1;
}

.base-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.btn-hex {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .calculator {
        max-width: 100%;
        border-radius: 0;
    }
    
    .calc-header {
        padding: 15px;
    }
    
    .calc-title {
        font-size: 20px;
    }
    
    .calc-display {
        padding: 20px;
    }
    
    .display-main {
        font-size: 36px;
    }
    
    .btn {
        padding: 15px;
        font-size: 18px;
    }
    
    .side-panel {
        width: 100%;
        right: -100%;
    }
    
    .conv-categories {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .fin-tabs {
        flex-wrap: wrap;
    }
    
    .graph-container {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .graph-actions {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .matrix-operations {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-results {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    body {
        padding: 0;
    }
    
    .calc-tabs {
        padding: 0 10px;
    }
    
    .tab {
        padding: 10px 15px;
        font-size: 14px;
    }
    
    .btn {
        padding: 12px;
        font-size: 16px;
    }
    
    .sci-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .prog-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .conv-inputs,
    .currency-inputs {
        flex-direction: column;
    }
    
    .swap-btn {
        transform: rotate(90deg);
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calc-body.active {
    animation: fadeIn 0.3s ease;
}

/* Print styles */
@media print {
    body {
        background-color: white;
    }
    
    .calculator {
        box-shadow: none;
    }
    
    .icon-btn,
    .calc-tabs,
    .btn {
        display: none;
    }
    
    .calc-display,
    .result-container,
    .stat-results,
    .matrix-result {
        display: block !important;
    }
}

/* Accessibility */
.btn:focus,
.icon-btn:focus,
.tab:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Protection Layer */
#protectionLayer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}