/* CSS Custom Properties and Variables */
:root {
    --primary-hue: 220;
    --primary-saturation: 90%;
    --primary-lightness: 60%;
    --primary: hsl(var(--primary-hue), var(--primary-saturation), var(--primary-lightness));
    
    --bg-primary: hsl(220, 20%, 12%);
    --bg-secondary: hsl(220, 20%, 16%);
    --bg-tertiary: hsl(220, 20%, 20%);
    
    --text-primary: hsl(0, 0%, 95%);
    --text-secondary: hsl(0, 0%, 75%);
    
    --success: hsl(145, 80%, 42%);
    --warning: hsl(45, 100%, 51%);
    --error: hsl(0, 90%, 62%);
    --danger: hsl(0, 90%, 62%);
    
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    --shadow-sm: 0 2px 15px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 5px 25px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
    
    --glass-bg: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    
    --perspective: 1200px;
    --header-height: 70px;
}

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Cairo', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    perspective: var(--perspective);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(29, 78, 216, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.1) 0%, transparent 25%);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.loading-logo {
    font-size: 4rem;
    color: var(--primary);
    animation: pulse 2s ease-in-out infinite;
}

.loading-text {
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), hsl(270, 90%, 65%));
    border-radius: 2px;
    animation: loading 2s ease-in-out infinite;
}

@keyframes loading {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* Neumorphism Glass Design */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--border-radius);
}

/* 3D Transform Elements */
.panel-3d {
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.panel-3d:hover {
    transform: translateZ(30px) rotateX(1deg) rotateY(1deg);
}

/* App Container Layout - Updated for new header design */
.app-container {
    display: grid;
    grid-template-areas: 
        "header"
        "main"
        "footer";
    grid-template-rows: var(--header-height) 1fr auto;
    min-height: 100vh;
}

/* Header Styles - Updated to not be fixed */
header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    position: relative;
    z-index: 100;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), hsl(270, 90%, 65%));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.logo-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary), hsl(270, 90%, 65%));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(5deg);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    color: white;
}

/* Menu Toggle Button */
.menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.3rem;
    box-shadow: var(--shadow-sm);
}

.menu-toggle:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

/* Hide original navigation */
.main-nav {
    display: none;
}

/* Sidebar Navigation */
.sidebar {
    position: fixed;
    top: 0;
    right: -350px;
    width: 350px;
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-left: 1px solid var(--glass-border);
    z-index: 2000;
    transition: right 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    overflow-y: auto;
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
}

.sidebar.open {
    right: 0;
}

.sidebar-header {
    padding: 2rem;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-logo .logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), hsl(270, 90%, 65%));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transform: none;
}

.sidebar-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.sidebar-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: rotate(90deg);
}

.sidebar-nav {
    padding: 1rem 0;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    margin: 0.25rem 0;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 2rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    border-right: 3px solid transparent;
    position: relative;
    overflow: hidden;
}

.sidebar-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(94, 114, 228, 0.1));
    transition: width 0.3s ease;
}

.sidebar-nav a:hover::before {
    width: 100%;
}

.sidebar-nav a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-right-color: var(--primary);
    transform: translateX(-5px);
}

.sidebar-nav a.active {
    background: rgba(94, 114, 228, 0.15);
    color: var(--primary);
    border-right-color: var(--primary);
}

.sidebar-nav i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.sidebar-nav a:hover i {
    transform: scale(1.2);
}

/* Sidebar Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Main Content Area */
main {
    grid-area: main;
    padding: 2rem;
    min-height: calc(100vh - var(--header-height) - 100px);
}

/* Color Palette Container */
.color-palette-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Control Panel */
.control-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    margin-bottom: 2rem;
}

.color-system-selector {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.system-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.system-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

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

.system-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.system-btn.active {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Color Input Controls */
.color-inputs {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.color-input {
    width: 60px;
    height: 40px;
    border: 2px solid var(--glass-border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.color-input:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

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

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

/* Color Palette Display */
.color-palette {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.color-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.color-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.color-preview {
    height: 200px;
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

.color-preview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 0, 0, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.color-preview:hover::before {
    opacity: 1;
}

.color-info {
    padding: 1.5rem;
    background: var(--bg-secondary);
}

.color-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.color-values {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: 'Fira Code', monospace;
}

.color-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.action-btn {
    background: none;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.action-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: scale(1.1);
}

/* Footer */
footer {
    grid-area: footer;
    padding: 2rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-links a.active {
    color: var(--primary);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
        gap: 1rem;
    }
    
    header {
        padding: 0 1rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .logo-icon {
        width: 40px;
        height: 40px;
    }
    
    .menu-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
    
    .sidebar {
        width: 300px;
        right: -300px;
    }
    
    main {
        padding: 1rem;
    }
    
    .control-panel {
        padding: 1.5rem;
        gap: 1rem;
    }
    
    .color-palette {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .color-system-selector {
        justify-content: center;
    }
    
    .system-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.8rem;
    }
    
    .footer-links {
        gap: 1rem;
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 280px;
        right: -280px;
    }
    
    .color-inputs {
        justify-content: center;
    }
    
    .action-buttons {
        justify-content: center;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.8rem;
    }
}

/* Animation Classes */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

.slide-in-right {
    animation: slideInRight 0.3s ease-out;
}

.slide-out-right {
    animation: slideOutRight 0.3s ease-out;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.visible { display: block; }

.flex { display: flex; }
.flex-column { flex-direction: column; }
.flex-center { justify-content: center; align-items: center; }
.flex-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }