:root, html.light {
    --surface: #f8fafc;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f1f5f9;
    --surface-container: #e2e8f0;
    --surface-container-high: #cbd5e1;
    --surface-container-highest: #94a3b8;
    --on-surface: #0f172a;
    --on-surface-variant: #475569;
    --outline-variant: #cbd5e1;
    --outline: #94a3b8;
    --primary: #c13584; /* Instagram Pink */
    --secondary: #f56040; /* Instagram Orange */
    --tertiary: #833ab4; /* Instagram Purple */
}

html.dark {
    --surface: #020617;
    --surface-container-lowest: #000000;
    --surface-container-low: #0f172a;
    --surface-container: #1e293b;
    --surface-container-high: #334155;
    --surface-container-highest: #475569;
    --on-surface: #f8fafc;
    --on-surface-variant: #cbd5e1;
    --outline-variant: #334155;
    --outline: #475569;
    --primary: #e1306c; /* Instagram Pink */
    --secondary: #fd1d1d; /* Instagram Red */
    --tertiary: #405de6; /* Instagram Blue */
}

body {
    background-color: var(--surface);
    color: var(--on-surface);
}

.primary-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--tertiary));
    background-size: 200% 200%;
    animation: gradientMove 5s ease infinite;
}

@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Glassmorphism */
.glass-nav {
    background: rgba(var(--surface-container-low), 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.glass-card {
    background: rgba(var(--surface-container-low), 0.3);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--outline-variant);
}

/* Glowing Orbs */
.glowing-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    z-index: 0;
    pointer-events: none;
    animation: float 10s infinite ease-in-out alternate;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -100px;
    left: -200px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--tertiary);
    bottom: -100px;
    right: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    top: 40%;
    left: 40%;
    animation-delay: -2s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, 50px) scale(1.1); }
}

/* Grid Slots */
.grid-slot {
    aspect-ratio: 1 / 1;
    background-color: var(--surface-container-high);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    background-size: cover;
    background-position: center;
    transition: filter 0.2s;
}

.grid-slot:hover {
    filter: brightness(0.9);
}

.grid-slot.drag-over {
    border: 2px dashed var(--primary);
    filter: brightness(0.8);
}

.remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    background: rgba(0,0,0,0.5);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s;
}

.grid-slot:hover .remove-btn {
    opacity: 1;
}