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

:root {
    --amber: #f59e0b;
    --amber-dark: #d97706;
    --amber-light: #fbbf24;
    --black: #0a0a0a;
    --black-light: #1a1a1a;
    --black-dark: #000000;
    --purple: #9333ea;
    --purple-dark: #7e22ce;
    --purple-light: #a855f7;
    --green: #10b981;
    --green-dark: #059669;
    --green-light: #34d399;
    --glass-bg: rgba(10, 10, 10, 0.6);
    --glass-border: rgba(245, 158, 11, 0.3);
    --shadow-dark: rgba(0, 0, 0, 0.5);
    --shadow-amber: rgba(245, 158, 11, 0.4);
}

html,
body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    overflow-x: hidden;
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 40%, #7e22ce 70%, #0a0a0a 100%);
    z-index: -1;
}

.background-gradient::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.08) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: moveBackground 20s linear infinite;
}

@keyframes moveBackground {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.calculator-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.title {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 30%, #9333ea 60%, #10b981 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: 2rem;
    text-shadow: 0 0 30px rgba(245, 158, 11, 0.5);
    animation: titlePulse 3s ease-in-out infinite;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.title-icon {
    font-size: 2.5rem;
    animation: iconRotate 4s linear infinite;
    display: inline-block;
}

@keyframes titlePulse {
    0%, 100% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.3);
    }
}

@keyframes iconRotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.container {
    width: 100%;
    max-width: 650px;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 30px;
    padding: 2.5rem;
    border: 2px solid rgba(245, 158, 11, 0.4);
    box-shadow: 
        0 8px 32px 0 rgba(0, 0, 0, 0.8),
        inset 0 1px 2px rgba(245, 158, 11, 0.2),
        0 0 80px rgba(245, 158, 11, 0.3);
    animation: containerFloat 6s ease-in-out infinite;
}

.controls-bar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.control-btn {
    flex: 1;
    min-width: 100px;
    padding: 0.6rem 1rem;
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.3), rgba(126, 34, 206, 0.3));
    border: 1px solid rgba(147, 51, 234, 0.5);
    border-radius: 10px;
    color: #fbbf24;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    font-family: 'Inter', sans-serif;
}

.control-btn:hover {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.5), rgba(126, 34, 206, 0.5));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(147, 51, 234, 0.4);
    border-color: rgba(245, 158, 11, 0.6);
}

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

.control-btn i {
    font-size: 1rem;
}

@keyframes containerFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.display-container {
    background: rgba(0, 0, 0, 0.7);
    border-radius: 20px;
    padding: 1.5rem;
    margin-bottom: 1rem;
    border: 2px solid rgba(245, 158, 11, 0.3);
    box-shadow: 
        inset 0 2px 10px rgba(0, 0, 0, 0.8),
        0 4px 20px rgba(245, 158, 11, 0.2);
}

.memory-bar {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.memory-btn {
    padding: 0.6rem;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(217, 119, 6, 0.15));
    border: 1px solid rgba(245, 158, 11, 0.4);
    border-radius: 10px;
    color: #fbbf24;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Orbitron', monospace;
    text-shadow: 0 0 10px rgba(251, 191, 36, 0.5);
}

.memory-btn:hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(217, 119, 6, 0.3));
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.5);
    border-color: rgba(251, 191, 36, 0.7);
}

.memory-btn:active {
    transform: translateY(0) scale(0.95);
}

.notification {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.95), rgba(26, 26, 26, 0.95));
    backdrop-filter: blur(10px);
    color: #fbbf24;
    padding: 1rem 1.5rem;
    border-radius: 15px;
    border: 2px solid rgba(245, 158, 11, 0.6);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.7), 0 0 40px rgba(245, 158, 11, 0.2);
    font-size: 0.95rem;
    font-weight: 600;
    z-index: 1000;
    opacity: 0;
    transform: translateX(100%);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Inter', sans-serif;
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification::before {
    content: '✓';
    display: inline-block;
    margin-right: 0.5rem;
    color: #10b981;
    font-weight: bold;
    font-size: 1.2rem;
}

.display-history {
    color: rgba(251, 191, 36, 0.6);
    font-size: 1rem;
    text-align: right;
    margin-bottom: 0.5rem;
    font-family: 'Orbitron', monospace;
    min-height: 24px;
}

#display {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: #fbbf24;
    font-size: 2.5rem;
    font-weight: 700;
    text-align: right;
    font-family: 'Orbitron', monospace;
    padding: 0.5rem 0;
    letter-spacing: 2px;
    text-shadow: 0 0 20px rgba(245, 158, 11, 0.8);
}

#display::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.success-flash {
    animation: successFlash 0.3s ease;
}

@keyframes successFlash {
    0%, 100% {
        background: rgba(0, 0, 0, 0.7);
    }
    50% {
        background: rgba(16, 185, 129, 0.4);
        border-color: rgba(16, 185, 129, 0.8);
    }
}

.error-flash {
    animation: errorFlash 0.3s ease;
}

@keyframes errorFlash {
    0%, 100% {
        background: rgba(0, 0, 0, 0.7);
    }
    50% {
        background: rgba(245, 158, 11, 0.4);
        border-color: rgba(245, 158, 11, 0.8);
    }
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.8rem;
}

.btn {
    border: none;
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 1.2rem;
    font-family: 'Inter', sans-serif;
    position: relative;
    overflow: hidden;
    box-shadow: 
        0 4px 15px rgba(0, 0, 0, 0.2),
        inset 0 1px 1px rgba(255, 255, 255, 0.1);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 8px 25px rgba(0, 0, 0, 0.3),
        inset 0 1px 1px rgba(255, 255, 255, 0.2);
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
}

.btn-number {
    background: linear-gradient(135deg, rgba(26, 26, 26, 0.9) 0%, rgba(10, 10, 10, 0.9) 100%);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.btn-number:hover {
    background: linear-gradient(135deg, rgba(26, 26, 26, 1) 0%, rgba(10, 10, 10, 1) 100%);
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5), 0 0 20px rgba(245, 158, 11, 0.3);
}

.btn-operator {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.25) 0%, rgba(217, 119, 6, 0.25) 100%);
    color: #ffffff;
    border: 1px solid rgba(245, 158, 11, 0.5);
}

.btn-operator:hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.4) 0%, rgba(217, 119, 6, 0.4) 100%);
    border-color: rgba(245, 158, 11, 0.8);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
}

.btn-function {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.25) 0%, rgba(126, 34, 206, 0.25) 100%);
    color: #ffffff;
    border: 1px solid rgba(147, 51, 234, 0.5);
    font-size: 0.95rem;
}

.btn-function:hover {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.4) 0%, rgba(126, 34, 206, 0.4) 100%);
    border-color: rgba(147, 51, 234, 0.8);
    box-shadow: 0 8px 25px rgba(147, 51, 234, 0.3);
}

.btn-clear {
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.8) 0%, rgba(0, 0, 0, 0.8) 100%);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.6);
}

.btn-clear:hover {
    background: linear-gradient(135deg, rgba(10, 10, 10, 1) 0%, rgba(0, 0, 0, 1) 100%);
    border-color: rgba(245, 158, 11, 0.9);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.6), 0 0 20px rgba(245, 158, 11, 0.3);
}

.btn-equals {
    background: linear-gradient(135deg, var(--amber) 0%, #d97706 100%);
    color: #000000;
    font-size: 1.5rem;
    font-weight: 700;
    border: 2px solid var(--amber);
    box-shadow: 
        0 4px 20px var(--shadow-amber),
        inset 0 1px 1px rgba(255, 255, 255, 0.3),
        0 0 30px var(--shadow-amber);
}

.btn-equals:hover {
    background: linear-gradient(135deg, var(--amber-light) 0%, var(--amber) 100%);
    box-shadow: 
        0 8px 30px var(--shadow-amber),
        inset 0 1px 1px rgba(255, 255, 255, 0.4),
        0 0 40px var(--shadow-amber);
}

/* Responsive Design */
@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }
    
    .title-icon {
        font-size: 1.5rem;
    }
    
    .container {
        max-width: 95%;
        padding: 1.5rem;
    }
    
    .controls-bar {
        gap: 0.3rem;
    }
    
    .control-btn {
        min-width: 80px;
        padding: 0.5rem 0.7rem;
        font-size: 0.75rem;
    }
    
    .memory-bar {
        gap: 0.3rem;
    }
    
    .memory-btn {
        padding: 0.5rem;
        font-size: 0.75rem;
    }
    
    .button-grid {
        gap: 0.5rem;
    }
    
    .btn {
        padding: 1rem;
        font-size: 0.95rem;
    }
    
    #display {
        font-size: 2rem;
    }
    
    .notification {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .calculator-wrapper {
        padding: 1rem;
    }
    
    .title {
        font-size: 1.5rem;
        gap: 0.5rem;
    }
    
    .controls-bar {
        flex-direction: column;
    }
    
    .control-btn {
        width: 100%;
        min-width: 0;
    }
    
    .memory-bar {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.4rem;
    }
    
    .button-grid {
        gap: 0.4rem;
    }
    
    .btn {
        padding: 0.8rem;
        font-size: 0.85rem;
        border-radius: 10px;
    }
    
    .btn-function {
        font-size: 0.75rem;
    }
    
    #display {
        font-size: 1.5rem;
    }
    
    .display-history {
        font-size: 0.85rem;
    }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.95), rgba(26, 26, 26, 0.95));
    border: 2px solid rgba(245, 158, 11, 0.5);
    border-radius: 20px;
    padding: 0;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.9), 0 0 100px rgba(245, 158, 11, 0.3);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.3), rgba(126, 34, 206, 0.3));
    border-bottom: 2px solid rgba(245, 158, 11, 0.3);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 20px 20px 0 0;
}

.modal-header h2 {
    color: #fbbf24;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.5rem;
    margin: 0;
}

.close-modal {
    color: #fbbf24;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    line-height: 1;
}

.close-modal:hover {
    color: #f59e0b;
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.modal-description {
    color: rgba(251, 191, 36, 0.8);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.function-category {
    margin-bottom: 2rem;
}

.function-category h3 {
    color: #fbbf24;
    font-family: 'Orbitron', sans-serif;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.advanced-btn {
    width: 100%;
    padding: 1rem;
    margin-bottom: 0.8rem;
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.2), rgba(126, 34, 206, 0.2));
    border: 1px solid rgba(147, 51, 234, 0.4);
    border-radius: 12px;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-family: 'Inter', sans-serif;
}

.advanced-btn:hover {
    background: linear-gradient(135deg, rgba(147, 51, 234, 0.4), rgba(126, 34, 206, 0.4));
    border-color: rgba(245, 158, 11, 0.6);
    transform: translateX(5px);
    box-shadow: 0 5px 20px rgba(147, 51, 234, 0.4);
}

.advanced-btn i {
    font-size: 1.3rem;
    color: #fbbf24;
}

.stats-input {
    width: 100%;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: 10px;
    color: #fbbf24;
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
    resize: vertical;
    min-height: 80px;
    margin-bottom: 1.5rem;
}

.stats-input:focus {
    outline: none;
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
}

.calculate-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--amber), var(--amber-light));
    border: 2px solid var(--amber);
    border-radius: 12px;
    color: #000000;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: 'Inter', sans-serif;
    margin-bottom: 1.5rem;
}

.calculate-btn:hover {
    background: linear-gradient(135deg, var(--amber-light), #fcd34d);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-amber);
}

.calculate-btn i {
    font-size: 1.2rem;
}

.result-display {
    min-height: 100px;
}

.result-display .success {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: 12px;
    padding: 1.5rem;
}

.result-display .error {
    background: rgba(245, 158, 11, 0.1);
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: 12px;
    padding: 1rem;
    color: #f59e0b;
}

.result-display h3 {
    color: #10b981;
    margin-bottom: 1rem;
    font-family: 'Orbitron', sans-serif;
}

.result-value {
    color: #fbbf24;
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0.5rem 0;
    font-family: 'Orbitron', monospace;
}

.result-details {
    color: rgba(251, 191, 36, 0.7);
    font-size: 0.95rem;
    margin: 0.5rem 0;
}

.data-set {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(245, 158, 11, 0.2);
}

.equation-group {
    margin-bottom: 1.5rem;
}

.equation-group h4 {
    color: #9333ea;
    margin-bottom: 0.8rem;
    font-size: 1rem;
}

.input-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.5rem;
}

.input-row input {
    width: 80px;
    padding: 0.6rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-radius: 8px;
    color: #fbbf24;
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
    text-align: center;
}

.input-row input:focus {
    outline: none;
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

.input-row span {
    color: #ffffff;
    font-weight: 600;
}

/* ================================
   THEME SYSTEM
   ================================ */

/* Dark Theme (Default) */
body[data-theme="dark"],
body:not([data-theme]) {
    --primary-color: #f59e0b;
    --secondary-color: #9333ea;
    --success-color: #10b981;
    --bg-gradient-1: #0a0a0a;
    --bg-gradient-2: #1a1a1a;
    --bg-gradient-3: #7e22ce;
}

/* Light Theme */
body[data-theme="light"] {
    --amber: #d97706;
    --amber-dark: #b45309;
    --amber-light: #f59e0b;
    --black: #f5f5f5;
    --black-light: #e5e5e5;
    --black-dark: #d4d4d4;
    --purple: #7c3aed;
    --purple-dark: #6d28d9;
    --purple-light: #8b5cf6;
    --green: #059669;
    --green-dark: #047857;
    --green-light: #10b981;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(217, 119, 6, 0.4);
    --shadow-dark: rgba(0, 0, 0, 0.1);
    --shadow-amber: rgba(217, 119, 6, 0.3);
}

body[data-theme="light"] .background-gradient {
    background: linear-gradient(135deg, #fef3c7 0%, #e0e7ff 40%, #f3e8ff 70%, #fef3c7 100%);
}

body[data-theme="light"] .display {
    color: #1a1a1a;
}

body[data-theme="light"] .button {
    color: #1a1a1a;
}

/* Blue Ocean Theme */
body[data-theme="blue"] {
    --amber: #3b82f6;
    --amber-dark: #2563eb;
    --amber-light: #60a5fa;
    --black: #0f172a;
    --black-light: #1e293b;
    --black-dark: #020617;
    --purple: #06b6d4;
    --purple-dark: #0891b2;
    --purple-light: #22d3ee;
    --green: #10b981;
    --green-dark: #059669;
    --green-light: #34d399;
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(59, 130, 246, 0.4);
    --shadow-dark: rgba(0, 0, 0, 0.6);
    --shadow-amber: rgba(59, 130, 246, 0.5);
}

body[data-theme="blue"] .background-gradient {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 40%, #0c4a6e 70%, #0f172a 100%);
}

/* Neon Pink Theme */
body[data-theme="neon"] {
    --amber: #ec4899;
    --amber-dark: #db2777;
    --amber-light: #f472b6;
    --black: #18181b;
    --black-light: #27272a;
    --black-dark: #09090b;
    --purple: #8b5cf6;
    --purple-dark: #7c3aed;
    --purple-light: #a78bfa;
    --green: #06b6d4;
    --green-dark: #0891b2;
    --green-light: #22d3ee;
    --glass-bg: rgba(24, 24, 27, 0.7);
    --glass-border: rgba(236, 72, 153, 0.5);
    --shadow-dark: rgba(0, 0, 0, 0.7);
    --shadow-amber: rgba(236, 72, 153, 0.6);
}

body[data-theme="neon"] .background-gradient {
    background: linear-gradient(135deg, #18181b 0%, #701a75 40%, #831843 70%, #18181b 100%);
}

/* ================================
   HISTORY SIDEBAR
   ================================ */

.history-sidebar {
    position: fixed;
    top: 0;
    right: -420px;
    width: 400px;
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-left: 2px solid var(--glass-border);
    box-shadow: -5px 0 30px var(--shadow-dark);
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 9999;
    display: flex;
    flex-direction: column;
}

.history-sidebar.open {
    right: 0;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 2px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.3);
}

.history-header h3 {
    margin: 0;
    color: var(--amber);
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.history-actions {
    display: flex;
    gap: 0.5rem;
}

.history-actions button {
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--glass-border);
    color: var(--amber-light);
    padding: 0.5rem 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.history-actions button:hover {
    background: var(--amber);
    border-color: var(--amber);
    color: var(--black);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-amber);
}

.history-search {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
}

.history-search input {
    width: 100%;
    padding: 0.8rem;
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    color: #ffffff;
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
}

.history-search input:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 20px var(--shadow-amber);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.history-item {
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.history-item:hover {
    background: rgba(0, 0, 0, 0.6);
    border-color: var(--amber);
    transform: translateX(-5px);
    box-shadow: 0 5px 20px var(--shadow-amber);
}

.history-item .expression {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    font-family: 'Orbitron', monospace;
}

.history-item .result {
    color: var(--amber-light);
    font-size: 1.2rem;
    font-weight: bold;
    font-family: 'Orbitron', monospace;
}

.no-history {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    padding: 3rem 1.5rem;
    font-size: 1.1rem;
}

/* ================================
   THEME SWITCHER MODAL
   ================================ */

.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 1.5rem 0;
}

.theme-option {
    cursor: pointer;
    text-align: center;
    transition: transform 0.3s ease;
}

.theme-option:hover {
    transform: translateY(-8px);
}

.theme-option.active .theme-preview {
    border-color: var(--amber);
    box-shadow: 0 0 30px var(--shadow-amber);
}

.theme-option p {
    color: #ffffff;
    margin-top: 0.8rem;
    font-weight: 600;
}

.theme-preview {
    width: 100%;
    height: 140px;
    border-radius: 12px;
    border: 3px solid var(--glass-border);
    overflow: hidden;
    transition: all 0.3s ease;
    position: relative;
}

.theme-preview .preview-top {
    height: 45%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: bold;
}

.theme-preview .preview-buttons {
    height: 55%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    padding: 12px;
}

.theme-preview .preview-buttons::before,
.theme-preview .preview-buttons::after {
    content: '';
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.dark-theme {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
}

.dark-theme .preview-top {
    background: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
}

.light-theme {
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 50%, #ffffff 100%);
}

.light-theme .preview-top {
    background: rgba(217, 119, 6, 0.3);
    color: #d97706;
}

.blue-theme {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0f172a 100%);
}

.blue-theme .preview-top {
    background: rgba(59, 130, 246, 0.3);
    color: #3b82f6;
}

.neon-theme {
    background: linear-gradient(135deg, #18181b 0%, #701a75 50%, #18181b 100%);
}

.neon-theme .preview-top {
    background: rgba(236, 72, 153, 0.3);
    color: #ec4899;
}

/* ================================
   CONVERTER STYLES
   ================================ */

.converter-input {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.converter-input label {
    color: var(--amber);
    font-weight: 700;
    font-size: 1rem;
    margin-top: 0.5rem;
}

.converter-input input,
.converter-input select {
    width: 100%;
    padding: 0.9rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    color: #ffffff;
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
}

.converter-input input:focus,
.converter-input select:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 20px var(--shadow-amber);
}

/* Converter Controls */
.converter-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.converter-controls input[type="number"] {
    width: 100%;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    color: var(--amber-light);
    font-size: 1.1rem;
    font-family: 'Orbitron', monospace;
    transition: all 0.3s ease;
}

.converter-controls input[type="number"]:focus {
    outline: none;
    border-color: var(--amber);
    background: rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 15px var(--shadow-amber);
}

.converter-controls select {
    width: 100%;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    color: var(--amber-light);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
}

.converter-controls select:hover {
    border-color: var(--amber);
    background: rgba(0, 0, 0, 0.7);
}

.converter-controls select:focus {
    outline: none;
    border-color: var(--amber);
    background: rgba(0, 0, 0, 0.8);
    box-shadow: 0 0 15px var(--shadow-amber);
}

.converter-controls select option {
    background: #1a1a1a;
    color: var(--amber-light);
    padding: 0.5rem;
}

.converter-results {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    min-height: 120px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    margin: 0.5rem 0;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border-left: 3px solid var(--amber);
}

.result-item .label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

.result-item .value {
    color: var(--amber-light);
    font-weight: bold;
    font-size: 1.1rem;
    font-family: 'Orbitron', monospace;
}

/* ================================
   GRAPHING CALCULATOR
   ================================ */

.modal-large {
    max-width: 850px;
}

.graph-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.graph-controls input {
    flex: 1;
    padding: 0.9rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    color: #ffffff;
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
}

.graph-controls input:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 20px var(--shadow-amber);
}

#graphCanvas {
    width: 100%;
    height: 450px;
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5);
}

.graph-info {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.4);
    border: 2px solid var(--glass-border);
    border-left: 4px solid var(--purple);
    border-radius: 10px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ================================
   MATRIX CALCULATOR
   ================================ */

/* Matrix Calculator */
.matrix-controls {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.matrix-controls label {
    color: var(--amber);
    font-weight: 700;
    font-size: 1rem;
}

.matrix-controls select {
    padding: 0.8rem 1.2rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 10px;
    color: #ffffff;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.matrix-controls select:hover {
    border-color: var(--amber);
    background: rgba(245, 158, 11, 0.1);
}

.matrix-controls select:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 15px var(--shadow-amber);
}

.matrix-size-controls {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding: 1.2rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 2px solid var(--glass-border);
    flex-wrap: wrap;
    justify-content: center;
    backdrop-filter: blur(5px);
}

.size-control {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: center;
}

.size-control label {
    color: var(--amber);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.size-control select {
    width: 100px;
    padding: 0.8rem 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    color: var(--amber-light);
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: 'Orbitron', monospace;
    cursor: pointer;
    transition: all 0.3s ease;
}

.size-control select:hover {
    border-color: var(--amber);
    background: rgba(245, 158, 11, 0.1);
}

.size-control select:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 15px var(--shadow-amber);
    transform: scale(1.05);
}

.size-control select option {
    background: rgba(0, 0, 0, 0.95);
    color: var(--amber-light);
    padding: 0.5rem;
}

.matrix-inputs {
    display: flex;
    gap: 2.5rem;
    margin: 2rem 0;
    flex-wrap: wrap;
    justify-content: center;
    align-items: flex-start;
}

.matrix-container {
    flex: 1;
    min-width: 160px;
    max-width: 480px;
    background: rgba(0, 0, 0, 0.2);
    padding: 1rem;
    border-radius: 12px;
    border: 2px solid var(--glass-border);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    overflow-x: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.matrix-container:hover {
    border-color: var(--amber);
    box-shadow: 0 0 20px var(--shadow-amber);
    transform: translateY(-2px);
}

.matrix-container h4 {
    color: var(--amber);
    margin-bottom: 1rem;
    font-size: 1.05rem;
    text-align: center;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 0 10px var(--shadow-amber);
    width: 100%;
}

.matrix-grid {
    display: grid;
    gap: 8px;
    margin-bottom: 0;
    justify-items: center;
    width: 100%;
}

.matrix-grid input {
    width: 100%;
    min-width: 50px;
    max-width: 70px;
    padding: 0.6rem 0.3rem;
    background: rgba(0, 0, 0, 0.7);
    border: 2px solid var(--glass-border);
    border-radius: 6px;
    color: var(--amber-light);
    text-align: center;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'Orbitron', monospace;
    transition: all 0.3s ease;
}

.matrix-grid input:hover {
    border-color: var(--amber);
    background: rgba(245, 158, 11, 0.1);
}

.matrix-grid input:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 20px var(--shadow-amber);
    transform: scale(1.08);
    background: rgba(245, 158, 11, 0.15);
}

.matrix-grid input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

/* Matrix Result Display */
.matrix-result {
    margin-top: 2rem;
}

.matrix-result .success {
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid rgba(16, 185, 129, 0.3);
    border-radius: 12px;
    padding: 2rem;
}

.matrix-result h3 {
    color: var(--amber);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    text-align: center;
}

.matrix-result .result-value {
    font-size: 2rem;
    color: var(--amber-light);
    text-align: center;
    margin: 1rem 0;
    font-family: 'Orbitron', monospace;
    text-shadow: 0 0 15px var(--shadow-amber);
}

.matrix-result .result-details {
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.95rem;
    margin: 0.5rem 0;
}

.matrix-result table {
    margin: 1.5rem auto;
    border-collapse: separate;
    border-spacing: 8px;
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 10px;
}

.matrix-result table td {
    padding: 10px 14px;
    text-align: center;
    color: var(--amber-light);
    font-family: 'Orbitron', monospace;
    font-size: 1.05rem;
    font-weight: 600;
    border: 2px solid var(--glass-border);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.4);
    min-width: 60px;
}

/* ================================
   CALCULATOR INPUT GROUPS
   ================================ */

.calc-input-group {
    margin-bottom: 1.5rem;
}

.calc-input-group label {
    display: block;
    color: var(--amber);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.calc-input-group input[type="number"],
.calc-input-group input[type="date"],
.calc-input-group select {
    width: 100%;
    padding: 0.8rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    color: var(--amber-light);
    font-size: 1rem;
    font-family: 'Orbitron', monospace;
    transition: all 0.3s ease;
}

.calc-input-group input[type="number"]:hover,
.calc-input-group input[type="date"]:hover,
.calc-input-group select:hover {
    border-color: var(--amber);
    background: rgba(245, 158, 11, 0.05);
}

.calc-input-group input[type="number"]:focus,
.calc-input-group input[type="date"]:focus,
.calc-input-group select:focus {
    outline: none;
    border-color: var(--amber);
    box-shadow: 0 0 15px var(--shadow-amber);
}

.calc-input-group select {
    cursor: pointer;
}

/* Gender Selector */
.gender-selector {
    display: flex;
    gap: 1rem;
}

.gender-btn {
    flex: 1;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.gender-btn:hover {
    border-color: var(--amber);
    background: rgba(245, 158, 11, 0.1);
    color: var(--amber-light);
}

.gender-btn.active {
    background: var(--amber);
    border-color: var(--amber);
    color: #000;
    font-weight: 600;
    box-shadow: 0 0 20px var(--shadow-amber);
}

.gender-btn i {
    font-size: 1.2rem;
}

/* BMI Visual Scale */
.bmi-scale-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 2px solid var(--glass-border);
}

.bmi-scale {
    position: relative;
    height: 40px;
    background: linear-gradient(to right, 
        #3b82f6 0%, 
        #3b82f6 18.5%, 
        #10b981 18.5%, 
        #10b981 25%, 
        #fbbf24 25%, 
        #fbbf24 30%, 
        #f59e0b 30%
    );
    border-radius: 20px;
    margin: 1rem 0;
    overflow: visible;
}

.bmi-marker {
    position: absolute;
    top: -15px;
    transform: translateX(-50%);
    transition: left 0.5s ease;
}

.bmi-marker-triangle {
    width: 0;
    height: 0;
    border-left: 12px solid transparent;
    border-right: 12px solid transparent;
    border-top: 20px solid var(--amber);
    filter: drop-shadow(0 2px 8px rgba(245, 158, 11, 0.6));
}

.bmi-marker-value {
    position: absolute;
    top: -35px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--amber);
    color: #000;
    padding: 4px 12px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1.1rem;
    white-space: nowrap;
    box-shadow: 0 0 15px var(--shadow-amber);
}

.bmi-scale-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.bmi-scale-labels span {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.bmi-scale-labels .label-value {
    font-weight: 600;
    color: var(--amber-light);
}

/* BMI Categories Legend */
.bmi-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem;
    margin-top: 1.5rem;
}

.bmi-category-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
}

.bmi-category-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    flex-shrink: 0;
}

.bmi-category-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* BMI Result Enhancement */
.bmi-result-large {
    font-size: 3rem !important;
    font-weight: 700 !important;
    margin: 1.5rem 0 !important;
    color: var(--amber-light) !important;
    text-shadow: 0 0 20px var(--shadow-amber);
}

.bmi-analysis {
    background: rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    border-radius: 10px;
    border: 2px solid var(--glass-border);
    margin-top: 1.5rem;
}

.bmi-analysis h4 {
    color: var(--amber);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.bmi-info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--glass-border);
}

.bmi-info-row:last-child {
    border-bottom: none;
}

.bmi-info-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.bmi-info-value {
    color: var(--amber-light);
    font-weight: 600;
}

.suggested-weight-range {
    background: rgba(245, 158, 11, 0.1);
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid var(--amber);
    margin-top: 1rem;
    text-align: center;
}

.suggested-weight-range h4 {
    color: var(--amber);
    margin-bottom: 0.5rem;
}

.suggested-weight-range p {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--amber-light);
}

/* ================================
   USER GUIDE STYLES
   ================================ */

.guide-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 2px solid var(--glass-border);
}

.guide-section h3 {
    color: var(--amber);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.guide-section h3 i {
    font-size: 1.5rem;
}

.guide-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.guide-list li {
    padding: 0.8rem;
    margin: 0.5rem 0;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    border-left: 3px solid var(--amber);
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.guide-list li:hover {
    background: rgba(245, 158, 11, 0.1);
    border-left-color: var(--amber-light);
    transform: translateX(5px);
    color: rgba(255, 255, 255, 1);
}

.guide-list li strong {
    color: var(--amber-light);
    font-weight: 600;
}

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

@media (max-width: 768px) {
    .history-sidebar {
        width: 100%;
        right: -100%;
    }
    
    .matrix-inputs {
        gap: 1.5rem;
    }
    
    .matrix-container {
        min-width: 100%;
        padding: 0.8rem;
    }
    
    .matrix-grid {
        gap: 6px;
    }
    
    .matrix-grid input {
        min-width: 42px;
        max-width: 50px;
        padding: 0.5rem 0.2rem;
        font-size: 0.85rem;
    }
    
    .matrix-inputs {
        gap: 1rem;
    }
    
    .matrix-size-controls {
        gap: 1rem;
        padding: 1rem;
    }
    
    .size-control select {
        width: 80px;
        padding: 0.6rem 0.8rem;
        font-size: 1rem;
    }
    
    .theme-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .modal-large {
        max-width: 95%;
    }
    
    #graphCanvas {
        height: 320px;
    }
    
    .matrix-inputs {
        flex-direction: column;
    }
    
    .graph-controls {
        flex-direction: column;
    }
    
    .converter-controls input,
    .converter-controls select {
        font-size: 1rem;
        padding: 0.9rem;
    }
    
    .gender-selector {
        flex-direction: column;
    }
    
    .gender-btn {
        width: 100%;
    }
    
    .bmi-categories {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .history-sidebar {
        width: 100vw;
    }
    
    .theme-grid {
        grid-template-columns: 1fr;
    }
    
    .theme-preview {
        height: 120px;
    }
}

/* ================================
   PWA STYLES
   ================================ */

/* PWA Install Button */
.pwa-install-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--amber), var(--amber-light));
    color: #000;
    border: 2px solid var(--amber);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 8px 30px var(--shadow-amber);
    transition: all 0.3s ease;
    z-index: 10000;
    animation: slideInUp 0.5s ease;
}

.pwa-install-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px var(--shadow-amber);
}

.pwa-install-btn i {
    font-size: 1.2rem;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(100px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Update Banner */
.update-banner {
    position: fixed;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(20px);
    border: 2px solid var(--amber);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
    z-index: 10001;
    transition: top 0.5s ease;
}

.update-banner.show {
    top: 20px;
}

.update-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--amber-light);
    font-weight: 600;
}

.update-content i {
    font-size: 1.5rem;
    color: var(--amber);
}

.update-btn {
    padding: 0.5rem 1rem;
    background: var(--amber);
    color: #000;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
}

.update-btn:hover {
    background: var(--amber-light);
    transform: scale(1.05);
}

.dismiss-btn {
    padding: 0.5rem;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.dismiss-btn:hover {
    color: var(--amber);
    transform: scale(1.2);
}

/* Offline Mode Indicator */
body.offline-mode::before {
    content: '📵 Offline Mode';
    position: fixed;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(239, 68, 68, 0.9);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 9999;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* iOS Splash Screen Support */
@media (display-mode: standalone) {
    body {
        user-select: none;
        -webkit-user-select: none;
        -webkit-touch-callout: none;
    }
    
    /* Hide install button when running as PWA */
    .pwa-install-btn {
        display: none !important;
    }
}

/* Android Splash Screen Support */
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
    }
}

/* Mobile PWA Optimizations */
@media (max-width: 768px) {
    .pwa-install-btn {
        bottom: 80px;
        right: 15px;
        padding: 0.8rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .update-banner {
        max-width: 90%;
        padding: 0.8rem 1rem;
        font-size: 0.85rem;
    }
}