/**
 * Modern Calculator Interface
 * Based on professional scientific calculator design
 * 
 * @package MathSolver_Pro
 */

/* ================================
   Calculator Container - FULL WIDTH & HEIGHT
   ================================ */
.modern-calculator {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background: #f7f7f7;
    overflow: auto;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

[data-theme="dark"] .modern-calculator {
    background: #1a1a1a;
}

/* Full screen page wrapper */
.calculator-fullscreen {
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden;
}

.calculator-fullscreen .site-header,
.calculator-fullscreen .site-footer,
.calculator-fullscreen .breadcrumbs {
    display: none !important;
}

body.calculator-page {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

/* ================================
   Header Bar - SIMPLE
   ================================ */
.calc-header {
    background: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    display: flex;
    align-items: center;
    padding: 0 20px;
    height: 60px;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .calc-header {
    background: #2a2a2a;
    border-bottom-color: #404040;
}

.calc-header-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: #2c3e50;
    margin: 0;
}

[data-theme="dark"] .calc-header-title {
    color: #e0e0e0;
}

/* ================================
   Display Area - FULL WIDTH AT TOP
   ================================ */
.calc-display-area {
    background: #ffffff;
    padding: clamp(20px, 4vh, 40px);
    flex-shrink: 0;
    min-height: 150px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    border-bottom: 1px solid #e5e5e5;
}

[data-theme="dark"] .calc-display-area {
    background: #2a2a2a;
    border-bottom-color: #404040;
}

[data-theme="dark"] .calc-display-area {
    background: linear-gradient(180deg, #1a1a1a 0%, #2a2a2a 100%);
}

/* Clean Expression & Result Display - FULL WIDTH */
.calc-expression {
    font-size: 1.2rem;
    color: #666;
    min-height: 30px;
    text-align: right;
    margin-bottom: 12px;
    font-family: 'Courier New', monospace;
    word-wrap: break-word;
}

[data-theme="dark"] .calc-expression {
    color: #999;
}

.calc-result {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    color: #2c3e50;
    text-align: right;
    font-family: 'Courier New', monospace;
    word-break: break-all;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

[data-theme="dark"] .calc-result {
    color: #e0e0e0;
}

.calc-result-label {
    font-size: 0.9rem;
    color: #999;
    text-align: right;
    margin-bottom: 8px;
    font-weight: 400;
}

[data-theme="dark"] .calc-result-label {
    color: #666;
}

/* ================================
   Tab Navigation - CENTERED
   ================================ */
.calc-tabs {
    display: flex;
    justify-content: center;
    background: #f5f5f5;
    border-bottom: 1px solid #e5e5e5;
    overflow-x: auto;
    flex-shrink: 0;
    height: 44px;
    padding: 4px 8px;
}

[data-theme="dark"] .calc-tabs {
    background: #2a2a2a;
    border-bottom-color: #404040;
}

.calc-tab {
    padding: 8px 16px;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: #666;
    transition: all 0.2s;
    white-space: nowrap;
    margin: 0 2px;
}

.calc-tab:hover {
    background: rgba(0, 123, 255, 0.08);
    color: #007bff;
}

.calc-tab.active {
    background: #007bff;
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(0, 123, 255, 0.2);
}

[data-theme="dark"] .calc-tab {
    color: #aaa;
}

[data-theme="dark"] .calc-tab:hover {
    background: rgba(66, 153, 225, 0.2);
    color: #4299e1;
}

[data-theme="dark"] .calc-tab.active {
    background: #4299e1;
    color: #1a1a1a;
}

/* ================================
   Calculator Buttons Container - CENTERED
   ================================ */
.calc-buttons-container {
    padding: 20px;
    background: #f7f7f7;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

[data-theme="dark"] .calc-buttons-container {
    background: #1a1a1a;
}

.calc-button-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 16px;
    width: 100%;
    max-width: 900px;
    justify-self: center;
}

@media (max-width: 768px) {
    .calc-button-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
        max-width: 100%;
    }
}

/* Button Base Styles (Desmos Style - Clean & Flat) */
.calc-btn {
    padding: 12px;
    min-height: 52px;
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    color: #2c3e50;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .calc-btn {
    background: #333;
    border-color: #444;
    color: #e0e0e0;
}

.calc-btn:hover {
    background: #e8e8e8;
    border-color: #d0d0d0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .calc-btn:hover {
    background: #3a3a3a;
    border-color: #555;
}

.calc-btn:active {
    transform: scale(0.97);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Number Buttons (Desmos Style - White Background) */
.calc-btn.number {
    background: #ffffff;
    border-color: #e0e0e0;
    font-size: 1.2rem;
    font-weight: 600;
    color: #2c3e50;
}

[data-theme="dark"] .calc-btn.number {
    background: #3a3a3a;
    border-color: #555;
    color: #e0e0e0;
}

.calc-btn.number:hover {
    background: #f5f5f5;
    border-color: #007bff;
}

[data-theme="dark"] .calc-btn.number:hover {
    background: #444;
    border-color: #4299e1;
}

/* Operator Buttons (Desmos Style - Subtle Blue) */
.calc-btn.operator {
    background: #f5f5f5;
    color: #007bff;
    font-size: 1.3rem;
    font-weight: 600;
    border-color: #e0e0e0;
}

[data-theme="dark"] .calc-btn.operator {
    background: #2a2a2a;
    color: #4299e1;
}

.calc-btn.operator:hover {
    background: #e6f2ff;
    color: #0056b3;
    border-color: #007bff;
}

[data-theme="dark"] .calc-btn.operator:hover {
    background: #1e3a5f;
    color: #4299e1;
}

/* Function Buttons (Desmos Style - Clean Grey) */
.calc-btn.function {
    background: #f8f8f8;
    font-size: 0.9rem;
    font-weight: 500;
    color: #555;
    border-color: #e5e5e5;
}

[data-theme="dark"] .calc-btn.function {
    background: #2d2d2d;
    color: #aaa;
}

.calc-btn.function:hover {
    background: #ececec;
    color: #007bff;
    border-color: #d0d0d0;
}

[data-theme="dark"] .calc-btn.function:hover {
    background: #383838;
    color: #4299e1;
}

/* Special Buttons (Desmos Style) */
.calc-btn.equals {
    background: #007bff;
    color: white;
    font-size: 1.3rem;
    font-weight: 600;
    border: none;
    grid-column: span 2;
    box-shadow: 0 2px 6px rgba(0, 123, 255, 0.25);
}

.calc-btn.equals:hover {
    background: #0069d9;
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.35);
}

[data-theme="dark"] .calc-btn.equals {
    background: #4299e1;
}

[data-theme="dark"] .calc-btn.equals:hover {
    background: #3182ce;
}

.calc-btn.clear-all {
    background: #f8f8f8;
    color: #dc3545;
    font-weight: 600;
    border-color: #e5e5e5;
}

.calc-btn.clear-all:hover {
    background: #fee;
    border-color: #dc3545;
    box-shadow: 0 2px 6px rgba(220, 53, 69, 0.2);
}

[data-theme="dark"] .calc-btn.clear-all {
    background: #3a2222;
    color: #ff6b6b;
}

.calc-btn.backspace {
    background: #f5f5f5;
    color: #666;
    font-size: 1.1rem;
    border-color: #e0e0e0;
}

.calc-btn.backspace:hover {
    background: #e8e8e8;
    color: #333;
}

[data-theme="dark"] .calc-btn.backspace {
    background: #333;
    color: #aaa;
}

.calc-btn.zero {
    grid-column: span 1;
}

/* Top Row - Special Functions */
.calc-top-row {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
}

/* Main Number Grid */
.calc-number-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3);
}

/* ================================
   Tab Content - CENTERED
   ================================ */
.calc-tab-content {
    display: none;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.calc-tab-content.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

/* ================================
   RAD/DEG Toggle (Desmos Style - Clean)
   ================================ */
.calc-mode-toggle {
    display: flex;
    gap: 4px;
    background: #f5f5f5;
    border-radius: 8px;
    padding: 4px;
}

[data-theme="dark"] .calc-mode-toggle {
    background: #333;
}

.calc-mode-btn {
    padding: 6px 14px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: #666;
    transition: all 0.2s;
    border-radius: 6px;
}

.calc-mode-btn:hover {
    background: rgba(0, 123, 255, 0.08);
    color: #007bff;
}

.calc-mode-btn.active {
    background: #007bff;
    color: white;
    box-shadow: 0 1px 3px rgba(0, 123, 255, 0.3);
}

[data-theme="dark"] .calc-mode-btn {
    color: #aaa;
}

[data-theme="dark"] .calc-mode-btn.active {
    background: #4299e1;
    color: #1a1a1a;
}

/* ================================
   Scientific Functions Row
   ================================ */
.calc-scientific-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

/* ================================
   Responsive Design - SIMPLE & FULL WIDTH
   ================================ */

/* Tablet */
@media (max-width: 1024px) {
    .calc-buttons-container {
        padding: 16px;
        max-width: 100%;
    }
    
    .calc-button-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .calc-header {
        padding: 0 15px;
        height: 55px;
    }
    
    .calc-header-title {
        font-size: 1rem;
    }
    
    .calc-display-area {
        padding: 15px 20px;
        min-height: 120px;
    }
    
    .calc-result {
        min-height: 50px;
    }
    
    .calc-expression {
        font-size: 1rem;
    }
    
    .calc-button-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }
    
    .calc-btn {
        min-height: 50px;
        font-size: 0.95rem;
        padding: 10px;
    }
    
    .calc-buttons-container {
        padding: 12px;
        gap: 12px;
    }
    
    .calc-tabs {
        height: 40px;
        padding: 3px 6px;
    }
    
    .calc-tab {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .calc-header {
        height: 50px;
        padding: 0 12px;
    }
    
    .calc-display-area {
        padding: 12px 15px;
        min-height: 100px;
    }
    
    .calc-result {
        min-height: 45px;
    }
    
    .calc-expression {
        font-size: 0.95rem;
    }
    
    .calc-button-grid {
        gap: 6px;
    }
    
    .calc-btn {
        min-height: 48px;
        font-size: 0.9rem;
        padding: 8px;
    }
    
    .calc-buttons-container {
        padding: 10px;
        gap: 10px;
    }
    
    .calc-tabs {
        height: 38px;
    }
}

/* Landscape Mode */
@media (max-height: 600px) and (orientation: landscape) {
    .calc-display-area {
        min-height: 80px;
        padding: 10px 20px;
    }
    
    .calc-result {
        font-size: 1.8rem;
        min-height: 40px;
    }
    
    .calc-btn {
        min-height: 45px;
        font-size: 0.9rem;
    }
    
    .calc-buttons-container {
        padding: 12px;
    }
}

/* ================================
   Sub-script and Super-script
   ================================ */
.calc-btn sub {
    font-size: 0.7em;
    vertical-align: sub;
}

.calc-btn sup {
    font-size: 0.7em;
    vertical-align: super;
}

/* ================================
   Button Icons
   ================================ */
.calc-btn-icon {
    display: inline-block;
    font-size: 1.2em;
}

/* ================================
   History Panel (Optional)
   ================================ */
.calc-history {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-4);
    max-height: 200px;
    overflow-y: auto;
}

.calc-history-item {
    padding: var(--spacing-2);
    border-bottom: 1px solid var(--border-color);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background var(--transition-base);
}

.calc-history-item:hover {
    background: var(--bg-tertiary);
}

.calc-history-empty {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-4);
    font-style: italic;
}

/* ================================
   Animations
   ================================ */
@keyframes buttonPress {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.95);
    }
    100% {
        transform: scale(1);
    }
}

.calc-btn.pressed {
    animation: buttonPress 0.2s ease-out;
}

/* ================================
   Error State
   ================================ */
.calc-result.error {
    color: #dc3545;
    font-size: 1.5rem;
}

/* ================================
   Memory Indicator
   ================================ */
.calc-memory-indicator {
    position: absolute;
    top: var(--spacing-2);
    left: var(--spacing-2);
    background: var(--accent-color);
    color: white;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

/* ================================
   Loading State
   ================================ */
.calc-loading {
    position: relative;
}

.calc-loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
}

/* ================================
   Close Button (Desmos Style - In Header)
   ================================ */
.calc-close-btn {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 300;
    line-height: 1;
    color: #666;
    background: transparent;
    transition: all 0.2s;
    border: none;
}

.calc-close-btn:hover {
    background: #f0f0f0;
    color: #333;
}

[data-theme="dark"] .calc-close-btn {
    color: #aaa;
}

[data-theme="dark"] .calc-close-btn:hover {
    background: #3a3a3a;
    color: #e0e0e0;
}

/* Mobile close button */
@media (max-width: 768px) {
    .calc-close-btn {
        width: 36px;
        height: 36px;
        font-size: 1.6rem;
    }
}