/* ===============================================
   SCIENTIFIC CALCULATOR - USING MODERNTOOLS UNIFIED THEME
   =============================================== */

/* Use modern tools color scheme */
:root {
    --primary-color: #3B82F6;
    --secondary-color: #10B981;
    --accent-color: #8B5CF6;
    --text-color: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #6B7280;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius-base: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;    
    --radius-2xl: 1.5rem;
    
    /* Gray color scale for consistency */
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    
    /* Scientific calculator specific colors */
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --success-color: #10B981;
    
    /* Calculator button colors */
    --btn-number: var(--bg-primary);
    --btn-number-hover: var(--gray-100);
    --btn-operator: var(--primary-color);
    --btn-operator-hover: #2563EB;
    --btn-function: var(--secondary-color);
    --btn-function-hover: #059669;
    --btn-equals: var(--accent-color);
    --btn-equals-hover: #7C3AED;
    --btn-clear: var(--danger-color);
    --btn-clear-hover: #DC2626;
}

/* Dark theme */
[data-theme="dark"] {
    --text-color: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    
    /* Dark theme button colors */
    --btn-number: var(--bg-tertiary);
    --btn-number-hover: #4B5563;
    --btn-operator: var(--primary-color);
    --btn-operator-hover: #3B82F6;
    --btn-function: var(--secondary-color);
    --btn-function-hover: #10B981;
    --btn-equals: var(--accent-color);
    --btn-equals-hover: #8B5CF6;
    --btn-clear: var(--danger-color);
    --btn-clear-hover: #F87171;
}

/* ===============================================
   CALCULATOR LAYOUT
   =============================================== */

.calculator-main {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.calculator-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Mode Toggle */
.calculator-mode-toggle {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.toggle-label {
    font-weight: 500;
    color: var(--text-tertiary);
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.toggle-label.active {
    color: var(--primary-color);
    font-weight: 600;
}

.mode-toggle {
    position: relative;
    width: 60px;
    height: 32px;
    background: var(--gray-200);
    border: none;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.mode-toggle.active {
    background: var(--primary-color);
}

.toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 26px;
    height: 26px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.mode-toggle.active .toggle-slider {
    transform: translateX(28px);
}

/* Calculator Card */
.calculator-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}

/* Display Area */
.calculator-display {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.display-secondary {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    min-height: 1.2rem;
    text-align: right;
    margin-bottom: 0.5rem;
    word-break: break-all;
}

.display-primary {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-color);
    text-align: right;
    min-height: 3rem;
    line-height: 1.2;
    word-break: break-all;
    font-family: 'Courier New', monospace;
}

.display-mode {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-base);
    font-size: 0.75rem;
    font-weight: 600;
}

/* Memory Functions */
.memory-functions {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.5rem;
    gap: 0.5rem;
    justify-content: center;
}

.memory-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-base);
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 50px;
}

.memory-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.memory-btn:active {
    transform: translateY(0);
}

.memory-btn.has-value {
    background: var(--warning-color);
    color: white;
    border-color: var(--warning-color);
}

/* Calculator Keypad */
.calculator-keypad {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.keypad-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
}

/* Calculator Buttons */
.calc-btn {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60px;
}

.calc-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.calc-btn:hover::before {
    left: 100%;
}

.calc-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.calc-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

/* Button Types */
.number-btn {
    background: var(--btn-number);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.number-btn:hover {
    background: var(--btn-number-hover);
}

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

.operator-btn:hover {
    background: var(--btn-operator-hover);
}

.function-btn {
    background: var(--btn-function);
    color: white;
    border: 1px solid var(--btn-function);
    font-size: 0.9rem;
}

.function-btn:hover {
    background: var(--btn-function-hover);
}

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

.equals-btn:hover {
    background: var(--btn-equals-hover);
}

/* Special function styling */
.calc-btn[data-action="C"],
.calc-btn[data-action="⌫"] {
    background: var(--btn-clear);
    color: white;
    border: 1px solid var(--btn-clear);
}

.calc-btn[data-action="C"]:hover,
.calc-btn[data-action="⌫"]:hover {
    background: var(--btn-clear-hover);
}

.calc-btn[data-action="2nd"] {
    background: var(--warning-color);
    color: white;
    border: 1px solid var(--warning-color);
}

.calc-btn[data-action="2nd"]:hover {
    background: #D97706;
}

.calc-btn[data-action="2nd"].active {
    background: #D97706;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

/* Trigonometric row styling */
.trigonometric-row {
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

/* Features Section */
.features-section {
    padding: 4rem 0;
    background: var(--bg-secondary);
}

.features-section h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
    font-size: 2.5rem;
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */

@media (max-width: 768px) {
    .calculator-main {
        padding: 2rem 0;
    }
    
    .calculator-container {
        max-width: 100%;
        padding: 0 1rem;
    }
    
    .calculator-display {
        padding: 1.5rem;
    }
    
    .display-primary {
        font-size: 2rem;
    }
    
    .calculator-keypad {
        padding: 1rem;
        gap: 0.5rem;
    }
    
    .keypad-row {
        gap: 0.5rem;
    }
    
    .calc-btn {
        min-height: 50px;
        font-size: 1rem;
    }
    
    .function-btn {
        font-size: 0.8rem;
    }
    
    .memory-functions {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .memory-btn {
        min-width: 40px;
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .features-section h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .toggle-container {
        padding: 0.5rem 1rem;
        gap: 0.75rem;
    }
    
    .mode-toggle {
        width: 50px;
        height: 28px;
    }
    
    .toggle-slider {
        width: 22px;
        height: 22px;
        top: 3px;
        left: 3px;
    }
    
    .mode-toggle.active .toggle-slider {
        transform: translateX(22px);
    }
    
    .display-primary {
        font-size: 1.75rem;
    }
    
    .calc-btn {
        min-height: 45px;
        font-size: 0.9rem;
    }
    
    .function-btn {
        font-size: 0.7rem;
    }
}

/* ===============================================
   ANIMATIONS AND EFFECTS
   =============================================== */

/* Button press animation */
@keyframes buttonPress {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); }
    100% { transform: scale(1); }
}

.calc-btn.pressed {
    animation: buttonPress 0.1s ease;
}

/* Error animation */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.calculator-display.error {
    animation: shake 0.5s ease;
}

.calculator-display.error .display-primary {
    color: var(--danger-color);
}

/* Success animation */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.equals-btn.calculating {
    animation: pulse 0.3s ease;
}

/* History item appear animation */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.history-item.new {
    animation: slideInUp 0.3s ease;
}

/* Loading state for complex calculations */
.calculator-display.calculating::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 2rem;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

.memory-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .calculator-main {
        padding: 1rem 0;
    }
    
    .calculator-card {
        box-shadow: none;
        border: 2px solid #000;
    }
    
    .calc-btn {
        border: 1px solid #000;
        background: white !important;
        color: black !important;
    }
}

/* ===============================================
   HERO SECTION STYLES
   =============================================== */

.tool-hero {
    margin-top: 0;
    padding: 120px 0 80px;
    position: relative;
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(59, 130, 246, 0.1) 30%, rgba(16, 185, 129, 0.1) 70%, var(--bg-primary) 100%);
}

.tool-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-tertiary);
    opacity: 0.3;
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 3;
}

.hero-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
}

.hero-icon i {
    font-size: 2.5rem;
    color: white;
}