:root {
    --bg-dark: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-primary: #818cf8;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    /* Dynamic Gradient Variables */
    --gradient-color-1: #1e293b;
    --gradient-color-2: #0f172a;
    --gradient-color-3: #1e1b4b;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    overflow-x: hidden;
    line-height: 1.6;
}

.background-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-dark);
    background-image:
        radial-gradient(circle at top left, var(--gradient-color-1) 0%, transparent 70%),
        radial-gradient(circle at bottom right, var(--gradient-color-2) 0%, transparent 70%),
        radial-gradient(circle at bottom left, var(--gradient-color-3) 0%, transparent 70%);
    transition: background-image 0.5s ease;
    z-index: -1;
}

/* Modern Glassmorphism Button Styles */
.glass-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border-radius: 999px;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.glass-btn.primary-btn {
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.2), rgba(79, 70, 229, 0.2));
    border-color: rgba(129, 140, 248, 0.4);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1), inset 0 1px 1px rgba(255, 255, 255, 0.1);
}

.glass-btn.icon-only-btn {
    padding: 0.6rem;
    border-radius: 50%;
}

.glass-btn.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(129, 140, 248, 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.2);
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.3), rgba(79, 70, 229, 0.3));
    border-color: rgba(129, 140, 248, 0.6);
}

.glass-btn i {
    width: 18px;
    height: 18px;
}

.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.5rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 100;
}

.nav-content .logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

main {
    padding-top: 100px;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

.hero {
    text-align: center;
    padding: 4rem 1rem;
    animation: fadeIn 1s ease-out;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--title-color-1, #fff), var(--title-color-2, var(--accent-primary)));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.experiment-card {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: 2rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    animation: slideUp 0.6s ease-out forwards;
}

.experiment-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(129, 140, 248, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.experiment-card h3 {
    font-size: 1.5rem;
}

.experiment-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.status-badge {
    align-self: flex-start;
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
}

.status-badge.status-active {
    background: rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.4);
    color: #4ade80;
}

.glass-footer {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Color Picker Modal Styles --- */
.cp-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.cp-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.cp-modal {
    width: 320px;
    background: #d1d5db;
    /* Light gray base */
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    position: relative;
    color: #374151;
    font-family: inherit;
    /* Inner subtle gradient to match reference */
    background: linear-gradient(180deg, #d1d5db 0%, #cbd5e1 60%, #9ca3af 100%);
}

.cp-top-bar {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    padding: 1rem 1rem 0 1rem;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 10;
}

.cp-icon-btn {
    background: none;
    border: none;
    color: #4b5563;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 32px;
    width: 32px;
    border-radius: 8px;
    transition: all 0.2s;
}

.cp-icon-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #111827;
}

.cp-icon-btn i {
    width: 18px;
    height: 18px;
}

.cp-interactive-area {
    height: 300px;
    position: relative;
    /* Dotted background pattern */
    background-image: radial-gradient(#9ca3af 1px, transparent 1px);
    background-size: 8px 8px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.cp-node {
    position: absolute;
    border-radius: 50%;
    border: 3px solid #ffffff;
    cursor: grab;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: translate(-50%, -50%);
    /* Center on coordinates */
    transition: transform 0.1s;
}

.cp-node:active {
    cursor: grabbing;
    transform: translate(-50%, -50%) scale(1.1);
}

.cp-bottom-bar {
    position: absolute;
    bottom: 1rem;
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.cp-controls-section {
    padding: 1.5rem 1rem;
    background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.1));
}

.cp-swatches-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.cp-swatch {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5), 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.cp-swatch:hover {
    transform: scale(1.2);
}

.cp-sliders {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 0.5rem;
}

/* Wavy range styling (simplified standard track for now) */
.cp-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: #9ca3af;
    border-radius: 3px;
    outline: none;
}

.cp-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 32px;
    background: #111827;
    border-radius: 6px;
    cursor: pointer;
}

.cp-dial {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e5e7eb, #d1d5db);
    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5), 0 4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.cp-dial::after {
    content: '';
    position: absolute;
    top: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 10px;
    background: #4b5563;
    border-radius: 2px;
}

@media (max-width: 768px) {
    .cp-modal {
        width: 90vw;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .grid-container {
        grid-template-columns: 1fr;
    }
}