/* 4D Manifold Explorer - Main Stylesheet */

:root {
    /* Dark theme (default) */
    --dark-bg: #121212;
    --surface: #1e1e1e;
    --surface-light: #2d2d2d;
    --primary: #BB86FC;
    --primary-variant: #3700B3;
    --secondary: #03DAC6;
    --accent: #CF6679;
    --text-primary: rgba(255, 255, 255, 0.87);
    --text-secondary: rgba(255, 255, 255, 0.6);
    --border-color: rgba(255, 255, 255, 0.12);
    --header-bg: rgba(18, 18, 18, 0.9);
    
    /* Specific visualization colors */
    --real-color: #FF6E91;  /* Vivid pink */
    --imag-color: #33C4FF;  /* Bright blue */
    --envelope-color: #65FF8F;  /* Bright green */
    --skb1-color: #FF6E91;  /* Vivid pink */
    --skb2-color: #33C4FF;  /* Bright blue */
    --skb3-color: #65FF8F;  /* Bright green */
    --skb-merged: #BB86FC;  /* Purple */
    
    /* Core Scientific Theme Colors */
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --secondary-gradient: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    --accent-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    
    /* SKB-specific colors with better contrast */
    --skb1-color: #ff6b9d; /* Enhanced pink with better visibility */
    --skb2-color: #4fc3f7; /* Enhanced blue */
    --skb3-color: #81c784; /* Enhanced green */
    --skb-merged: #bb86fc; /* Purple for merged states */
    
    /* Enhanced background gradients */
    --background: linear-gradient(135deg, #0f1419 0%, #1a202c 25%, #2d3748 50%, #1a202c 75%, #0f1419 100%);
    --surface: rgba(45, 55, 72, 0.95);
    --surface-light: rgba(74, 85, 104, 0.8);
    --surface-elevated: rgba(45, 55, 72, 0.98);
    
    /* Enhanced text colors */
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-tertiary: #cbd5e0;
    --text-accent: #a0aec0;
    
    /* Scientific visualization specific */
    --grid-color: rgba(226, 232, 240, 0.1);
    --axis-color: rgba(226, 232, 240, 0.3);
    --highlight-glow: 0 0 20px rgba(99, 102, 241, 0.4);
    --data-glow: 0 0 15px rgba(139, 92, 246, 0.3);
    
    /* Animation and interaction */
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --border-radius-elegant: 16px;
    --shadow-elegant: 0 10px 40px rgba(0, 0, 0, 0.3);
}

/* Light theme */
[data-theme="light"] {
    --dark-bg: #f5f5f5;
    --surface: #ffffff;
    --surface-light: #e0e0e0;
    --primary: #6200EE;
    --primary-variant: #3700B3;
    --secondary: #03DAC6;
    --accent: #CF6679;
    --text-primary: rgba(0, 0, 0, 0.87);
    --text-secondary: rgba(0, 0, 0, 0.6);
    --border-color: rgba(0, 0, 0, 0.12);
    --header-bg: rgba(245, 245, 245, 0.95);
    
    /* We'll keep visualization colors the same for consistency */
}

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

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.site-header {
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background-color: var(--header-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    padding: 15px 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 300;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 1.5rem;
}

/* =====================================================   ENHANCED NAVIGATION - Best Practices Implementation   ===================================================== *//* Screen Reader Only Content */.sr-only {    position: absolute;    width: 1px;    height: 1px;    padding: 0;    margin: -1px;    overflow: hidden;    clip: rect(0, 0, 0, 0);    white-space: nowrap;    border: 0;}/* Main Navigation Container */.main-nav {    display: flex;    align-items: center;    justify-content: space-between;    gap: 20px;    width: 100%;    height: 100%;}/* Mobile Menu Toggle (Hamburger) */.mobile-menu-toggle {    display: none;    flex-direction: column;    justify-content: space-between;    width: 24px;    height: 18px;    background: transparent;    border: none;    cursor: pointer;    padding: 0;    z-index: 1001;    transition: var(--transition-smooth);}.mobile-menu-toggle:focus {    outline: 2px solid var(--primary);    outline-offset: 3px;}.hamburger-line {    width: 100%;    height: 2px;    background-color: var(--text-primary);    transition: var(--transition-smooth);    border-radius: 2px;}.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {    transform: translateY(8px) rotate(45deg);}.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {    opacity: 0;}.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {    transform: translateY(-8px) rotate(-45deg);}/* Navigation Menu */.nav-menu {    display: flex;    align-items: center;    gap: 25px;    list-style: none;    margin: 0;    padding: 0;}.nav-item {    position: relative;}/* Navigation Links */.nav-link {    display: flex;    align-items: center;    gap: 8px;    padding: 8px 12px;    color: var(--text-secondary);    text-decoration: none;    font-size: 0.95rem;    font-weight: 500;    border-radius: 8px;    transition: var(--transition-smooth);    position: relative;    background: transparent;    border: none;    cursor: pointer;    white-space: nowrap;}.nav-link:hover,.nav-link:focus {    color: var(--primary);    background-color: rgba(187, 134, 252, 0.1);    transform: translateY(-1px);}.nav-link:focus {    outline: 2px solid var(--primary);    outline-offset: 2px;}.nav-link.active {    color: var(--primary);    background-color: rgba(187, 134, 252, 0.15);    box-shadow: 0 2px 8px rgba(187, 134, 252, 0.3);}.nav-link i {    font-size: 0.9rem;    opacity: 0.8;    transition: var(--transition-smooth);}.nav-link:hover i,.nav-link.active i {    opacity: 1;    transform: scale(1.1);}/* Dropdown Functionality */.nav-dropdown .dropdown-toggle {    background: transparent;    border: none;    cursor: pointer;}.dropdown-arrow {    transition: transform 0.3s ease;    margin-left: 4px;    font-size: 0.7rem;}.nav-dropdown[aria-expanded="true"] .dropdown-arrow {    transform: rotate(180deg);}/* Dropdown Menu */.dropdown-menu {    position: absolute;    top: calc(100% + 8px);    left: 0;    min-width: 220px;    background: var(--surface-elevated);    border: 1px solid rgba(255, 255, 255, 0.1);    border-radius: 12px;    padding: 8px 0;    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);    z-index: 1000;    opacity: 0;    visibility: hidden;    transform: translateY(-10px) scale(0.95);    transition: var(--transition-smooth);    backdrop-filter: blur(10px);    -webkit-backdrop-filter: blur(10px);    list-style: none;    margin: 0;}.nav-dropdown:hover .dropdown-menu,.nav-dropdown[aria-expanded="true"] .dropdown-menu {    opacity: 1;    visibility: visible;    transform: translateY(0) scale(1);}.dropdown-menu li {    margin: 0;}.dropdown-link {    display: flex;    align-items: center;    gap: 10px;    padding: 10px 16px;    color: var(--text-secondary);    text-decoration: none;    font-size: 0.9rem;    transition: var(--transition-smooth);    border-radius: 8px;    margin: 2px 8px;}.dropdown-link:hover,.dropdown-link:focus {    background-color: rgba(187, 134, 252, 0.1);    color: var(--primary);    transform: translateX(4px);}.dropdown-link:focus {    outline: 2px solid var(--primary);    outline-offset: 2px;}.dropdown-link.active {    background-color: rgba(187, 134, 252, 0.2);    color: var(--primary);}.dropdown-link i {    font-size: 0.8rem;    opacity: 0.7;    width: 16px;    text-align: center;}.dropdown-link:hover i,.dropdown-link.active i {    opacity: 1;}/* Theme Toggle */.nav-theme-toggle {    display: flex;    align-items: center;    margin-left: 20px;}.theme-toggle-label {    display: flex;    align-items: center;    gap: 8px;    cursor: pointer;    padding: 6px;    border-radius: 8px;    transition: var(--transition-smooth);    position: relative;}.theme-toggle-label:hover {    background-color: rgba(255, 255, 255, 0.05);}.theme-checkbox {    position: absolute;    opacity: 0;    pointer-events: none;}.theme-checkbox:focus + .theme-slider {    box-shadow: 0 0 0 2px var(--primary);}.theme-icon {    font-size: 1rem;    color: var(--text-secondary);    transition: var(--transition-smooth);    z-index: 2;    position: relative;}.theme-slider {    position: relative;    width: 40px;    height: 20px;    background-color: var(--surface-light);    border-radius: 20px;    transition: var(--transition-smooth);    border: 1px solid rgba(255, 255, 255, 0.1);}.theme-slider::before {    content: '';    position: absolute;    top: 2px;    left: 2px;    width: 16px;    height: 16px;    background-color: var(--primary);    border-radius: 50%;    transition: var(--transition-smooth);    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);}.theme-checkbox:checked + .theme-slider::before {    transform: translateX(20px);}.theme-checkbox:checked + .theme-slider {    background-color: rgba(187, 134, 252, 0.3);}.theme-icon-light {    opacity: 1;}.theme-icon-dark {    opacity: 0.5;}.theme-checkbox:checked ~ .theme-icon-light {    opacity: 0.5;}.theme-checkbox:checked ~ .theme-icon-dark {    opacity: 1;}/* =====================================================   RESPONSIVE DESIGN - Mobile First Approach   ===================================================== */@media (max-width: 768px) {    .mobile-menu-toggle {        display: flex;    }    .nav-menu {        position: fixed;        top: 100%;        left: 0;        width: 100%;        height: calc(100vh - 70px);        background: var(--surface-elevated);        backdrop-filter: blur(20px);        -webkit-backdrop-filter: blur(20px);        border-top: 1px solid rgba(255, 255, 255, 0.1);        flex-direction: column;        align-items: stretch;        gap: 0;        padding: 20px;        overflow-y: auto;        transform: translateY(-100%);        opacity: 0;        visibility: hidden;        transition: var(--transition-smooth);        z-index: 1000;    }    .nav-menu[aria-expanded="true"] {        transform: translateY(0);        opacity: 1;        visibility: visible;    }    .nav-item {        width: 100%;        border-bottom: 1px solid rgba(255, 255, 255, 0.05);        padding: 8px 0;    }    .nav-item:last-child {        border-bottom: none;    }    .nav-link {        width: 100%;        justify-content: flex-start;        padding: 12px 16px;        font-size: 1rem;        border-radius: 8px;    }    .nav-dropdown .dropdown-menu {        position: static;        opacity: 1;        visibility: visible;        transform: none;        box-shadow: none;        background: rgba(255, 255, 255, 0.05);        border: 1px solid rgba(255, 255, 255, 0.1);        margin: 8px 0 0 0;        max-height: 0;        overflow: hidden;        transition: max-height 0.3s ease;    }    .nav-dropdown[aria-expanded="true"] .dropdown-menu {        max-height: 300px;    }    .dropdown-link {        padding: 8px 20px;        margin: 0;        border-radius: 0;    }    .nav-theme-toggle {        margin: 20px 0 0 0;        justify-content: center;        padding-top: 20px;        border-top: 1px solid rgba(255, 255, 255, 0.1);    }    /* Hide dropdown menu when mobile menu is closed */    .nav-menu:not([aria-expanded="true"]) .dropdown-menu {        max-height: 0;        overflow: hidden;    }}@media (max-width: 480px) {    .main-nav {        gap: 10px;    }    .nav-menu {        padding: 15px;    }    .nav-link {        padding: 10px 12px;        font-size: 0.95rem;    }    .dropdown-link {        padding: 8px 16px;        font-size: 0.9rem;    }}/* =====================================================   ACCESSIBILITY ENHANCEMENTS   ===================================================== *//* High contrast mode support */@media (prefers-contrast: high) {    .nav-link {        border: 1px solid transparent;    }    .nav-link:hover,    .nav-link:focus,    .nav-link.active {        border-color: var(--primary);    }    .dropdown-menu {        border: 2px solid var(--primary);    }}/* Reduced motion support */@media (prefers-reduced-motion: reduce) {    .nav-link,    .dropdown-menu,    .theme-slider,    .theme-icon,    .hamburger-line,    .dropdown-arrow {        transition: none;    }    .nav-link:hover {        transform: none;    }    .dropdown-link:hover {        transform: none;    }}/* Focus indicators for keyboard navigation */.nav-link:focus-visible,.dropdown-link:focus-visible,.theme-toggle-label:focus-visible,.mobile-menu-toggle:focus-visible {    outline: 2px solid var(--primary);    outline-offset: 2px;    border-radius: 4px;}/* Keyboard navigation improvements */.nav-dropdown[data-keyboard-open] .dropdown-menu {    opacity: 1;    visibility: visible;    transform: translateY(0) scale(1);}

/* Buttons */
.cta-button, .button {
    background-color: var(--primary);
    color: #000;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
}

.cta-button:hover, .button:hover {
    background-color: var(--primary-variant);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.4);
}
/* Button sizes */
.btn-small { font-size: 0.9rem; padding: 8px 16px; }

/* Spacing utilities */
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }


/* Form controls */
input[type="range"] {
    width: 100%;
    background: var(--surface-light);
    height: 8px;
    border-radius: 4px;
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    appearance: none;
    margin: 10px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    -moz-appearance: none;
    appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
}

input[type="range"]::-ms-thumb {
    -ms-appearance: none;
    appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

/* Standard appearance property for all form elements */
select, input, button, textarea {
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    appearance: none;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    background-color: var(--surface);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    padding: 8px 12px;
    transition: all 0.3s ease;
}

/* Reset to browser defaults for checkboxes and radios */
input[type="checkbox"], 
input[type="radio"] {
    -webkit-appearance: auto;
    -moz-appearance: auto;
    -ms-appearance: auto;
    appearance: auto;
    padding: initial;
    border: initial;
    background-color: initial;
}

/* Style for select elements */
select {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23FFFFFF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    background-size: 16px;
    padding-right: 2.5rem;
}

[data-theme="light"] select {
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23000000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

/* Focus states */
select:focus, input:focus, button:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(187, 134, 252, 0.3);
}

/* Plotly plot standardization */
.plotly-container {
    background-color: var(--surface);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Card styles */
.card {
    background-color: var(--surface);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.card-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--primary);
}

/* Slider layout */
.slider-container {
    position: relative;
    margin-bottom: 15px;
}

.slider-container label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding-right: 40px;
}

.value-display {
    position: absolute;
    right: 0;
    top: 0;
    width: 35px;
    text-align: right;
    color: var(--primary);
    font-weight: 500;
    font-size: 0.85rem;
}

.slider-container input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--surface-light);
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin-top: 8px;
    cursor: pointer;
}

.slider-container input[type="range"]::-webkit-slider-thumb,
.slider-container input[type="range"]::-moz-range-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

/* Toggle switch */
.toggle-switch {
    display: inline-block;
    position: relative;
    width: 48px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface);
    transition: .4s;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 2px;
    background-color: var(--text-secondary);
    transition: .4s;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary-variant);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(22px);
    background-color: white;
}

/* Tooltip styling */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: pointer;
    margin-left: 5px;
}

.tooltip .tooltip-icon {
    color: var(--text-secondary);
    font-size: 14px;
}

.tooltip .tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--surface-light);
    color: var(--text-primary);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 10;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.8rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.tooltip:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Responsive design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
}

/* Enhanced Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Enhanced Typography with Scientific Hierarchy */
h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    text-align: center;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    border-bottom: 2px solid transparent;
    border-image: var(--secondary-gradient) 1;
    padding-bottom: 0.75rem;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Enhanced Scientific Icons */
h3::before {
    content: '◆';
    color: var(--skb1-color);
    font-size: 0.8em;
    opacity: 0.8;
}

/* Enhanced Control Panel with Scientific Elegance */
.control-panel {
    background: var(--surface-elevated);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-elegant);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-elegant);
    position: relative;
    overflow: hidden;
}

.control-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--primary-gradient);
    opacity: 0.6;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.control-group {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1.5rem;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.control-group::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--secondary-gradient);
    opacity: 0;
    transition: var(--transition-smooth);
}

.control-group:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: var(--surface-light);
    transform: translateY(-2px);
    box-shadow: var(--data-glow);
}

.control-group:hover::before {
    opacity: 1;
}

/* Enhanced Slider Design with Scientific Precision */
.slider-container {
    margin-bottom: 1.5rem;
    position: relative;
}

.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.slider-value {
    background: rgba(99, 102, 241, 0.2);
    color: #6366f1;
    padding: 0.25rem 0.75rem;
    border-radius: 8px;
    font-weight: 600;
    min-width: 60px;
    text-align: center;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.85rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    transition: var(--transition-smooth);
}

.slider-value.highlight {
    background: rgba(99, 102, 241, 0.4);
    color: #8b5cf6;
    box-shadow: var(--highlight-glow);
    transform: scale(1.05);
}

/* Enhanced Slider with Gradient Track */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: linear-gradient(90deg, var(--surface-light), var(--surface));
    border-radius: 4px;
    outline: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.slider::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--primary-gradient);
    border-radius: 4px;
    width: var(--slider-progress, 0%);
    transition: var(--transition-smooth);
}

.slider:hover {
    box-shadow: var(--highlight-glow);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 3px 12px rgba(99, 102, 241, 0.4);
    transition: var(--transition-bounce);
    border: 2px solid rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 2;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 5px 20px rgba(99, 102, 241, 0.6);
}

.slider::-webkit-slider-thumb:active {
    transform: scale(1.25);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 3px 12px rgba(99, 102, 241, 0.4);
    transition: var(--transition-bounce);
}

/* Enhanced Visualization Container */
.visualization-container {
    background: var(--surface-elevated);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-elegant);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-elegant);
    min-height: 650px;
    position: relative;
    overflow: hidden;
}

.visualization-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0.8;
}

#plot {
    width: 100%;
    height: 600px;
    border-radius: 12px;
    background: radial-gradient(ellipse at center, rgba(15, 20, 25, 0.95), rgba(15, 20, 25, 1));
    position: relative;
    overflow: hidden;
}

/* Enhanced Properties Panel with Scientific Styling */
.properties-panel {
    background: var(--surface-elevated);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-elegant);
    padding: 2rem;
    box-shadow: var(--shadow-elegant);
    position: relative;
}

.properties-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.property-card {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
}

.property-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    opacity: 0;
    transition: var(--transition-smooth);
}

.property-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: var(--surface-light);
    transform: translateY(-3px);
    box-shadow: var(--data-glow);
}

.property-card:hover::before {
    opacity: 1;
}

.property-label {
    font-size: 0.85rem;
    color: var(--text-accent);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    font-weight: 500;
}

.property-value {
    font-size: 1.4rem;
    font-weight: 600;
    color: #6366f1;
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    transition: var(--transition-smooth);
}

.property-value.highlight {
    color: #8b5cf6;
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.5);
    transform: scale(1.05);
}

/* Enhanced Button Styling */
.btn {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition-bounce);
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.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 0.6s ease;
}

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

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

.btn.active {
    background: var(--accent-gradient);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

/* Enhanced Toggle Switch with Scientific Style */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.toggle-switch {
    position: relative;
    width: 70px;
    height: 36px;
    background: var(--surface-light);
    border-radius: 18px;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 2px solid rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.3);
}

.toggle-switch.active {
    background: var(--primary-gradient);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: var(--highlight-glow);
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 28px;
    height: 28px;
    background: white;
    border-radius: 50%;
    transition: var(--transition-bounce);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-slider::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--surface-light);
    border-radius: 50%;
    transition: var(--transition-smooth);
}

.toggle-switch.active .toggle-slider {
    transform: translateX(34px);
}

.toggle-switch.active .toggle-slider::before {
    background: #6366f1;
}

.toggle-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Enhanced Responsive Design */
@media (max-width: 768px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }
    
    .properties-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .control-panel {
        padding: 1.5rem;
    }
    
    .visualization-container {
        padding: 1rem;
    }
    
    #plot {
        height: 400px;
    }
}

/* Enhanced Animation Classes */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 10px rgba(99, 102, 241, 0.3); }
    50% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.6); }
}

@keyframes shimmer {
    0% { background-position: -200px 0; }
    100% { background-position: 200px 0; }
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

.shimmer-effect {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    background-size: 200px 100%;
    animation: shimmer 2s infinite;
}

/* Enhanced Scientific Notation and Mathematical Expressions */
.scientific-notation {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.9em;
    color: #6366f1;
    background: rgba(99, 102, 241, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.math-formula {
    font-family: 'Computer Modern', 'Times New Roman', serif;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--surface);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid #6366f1;
    margin: 1rem 0;
}

/* Loading States with Scientific Theme */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
    color: #6366f1;
    font-size: 1.1rem;
    gap: 1rem;
}

.loading::after {
    content: '';
    width: 24px;
    height: 24px;
    border: 3px solid rgba(99, 102, 241, 0.3);
    border-top: 3px solid #6366f1;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Enhanced Error States */
.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    position: relative;
}

.error::before {
    content: '⚠';
    margin-right: 0.5rem;
    color: #ef4444;
}

/* Color indicators for SKB components */
.color-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.color-skb1 { background: var(--skb1-color); }
.color-skb2 { background: var(--skb2-color); }
.color-skb3 { background: var(--skb3-color); }

/* Enhanced accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus states for accessibility */
.slider:focus,
.btn:focus,
.toggle-switch:focus {
    outline: 2px solid #6366f1;
    outline-offset: 2px;
}

/* Enhanced tooltip styling */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    z-index: 1000;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tooltip:hover::after {
    opacity: 1;
}