/* =========================================
   Xaerisoft Universe Theme & Variables
========================================= */
:root {
    --bg-dark: #0a0514;
    --purple-glow: rgba(138, 43, 226, 0.4);
    --purple-light: #b388ff;
    --accent: #7c4dff;
    --glass-bg: rgba(20, 15, 35, 0.5);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f5f5fc;
    --text-muted: #a9a2c2;
    --font-main: system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-main);
    min-height: 100vh;
    overflow-x: hidden;
}

/* =========================================
   Background Effects (Aurora & Stars)
========================================= */
.universe-bg {
    position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: -1; overflow: hidden;
}

.aurora {
    position: absolute;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle at 50% 50%, var(--purple-glow), transparent 60%),
                radial-gradient(circle at 80% 20%, rgba(65, 105, 225, 0.3), transparent 50%);
    filter: blur(80px);
    animation: aurora-shift 25s infinite alternate ease-in-out;
}

@keyframes aurora-shift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(10%, 15%) scale(1.1); }
}

.stars {
    width: 100%; height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #eee, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 40px 70px, #fff, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 50px 160px, #ddd, rgba(0,0,0,0)),
        radial-gradient(2px 2px at 90px 40px, #fff, rgba(0,0,0,0));
    background-repeat: repeat;
    background-size: 200px 200px;
    animation: twinkle 4s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 0.3; }
}

/* =========================================
   Layout & Glassmorphism
========================================= */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

header { margin-bottom: 2rem; }
.glow-text {
    font-size: 2.5rem; color: #fff;
    text-shadow: 0 0 10px var(--purple-light), 0 0 20px var(--accent);
    margin-bottom: 0.5rem;
}
.subtitle { color: var(--text-muted); font-size: 1.1rem; margin-bottom: 1rem; }

.privacy-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(124, 77, 255, 0.2); border: 1px solid var(--accent);
    padding: 6px 16px; border-radius: 20px; font-size: 0.9rem; color: var(--purple-light);
}

/* =========================================
   Upload Area
========================================= */
.upload-area {
    border: 2px dashed var(--accent); cursor: pointer; transition: all 0.3s ease; text-align: center;
}
.upload-area:hover, .upload-area.dragover {
    background: rgba(124, 77, 255, 0.1); border-color: var(--purple-light);
}
.upload-content .icon { font-size: 4rem; display: block; margin-bottom: 1rem; }
.upload-content h2 { margin-bottom: 0.5rem; }
.upload-content p { color: var(--text-muted); margin-bottom: 1.5rem; }

/* =========================================
   Editor Workspace
========================================= */
.editor-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; }

.preview-section {
    display: flex; flex-direction: column; align-items: center; position: relative;
}

#loading-overlay {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(10, 5, 20, 0.8); z-index: 10; display: none;
    align-items: center; justify-content: center; font-weight: bold; font-size: 1.2rem;
    color: var(--purple-light); border-radius: 16px;
}

/* Comparison Slider */
.comparison-slider {
    position: relative; width: 100%; aspect-ratio: 16/9;
    border-radius: 8px; overflow: hidden; background: #000;
}

.comparison-slider img {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    object-fit: contain; pointer-events: none;
}

.img-before-wrapper {
    position: absolute; top: 0; left: 0; width: 50%; height: 100%;
    overflow: hidden; z-index: 1;
}

.slider {
    position: absolute; appearance: none;
    width: 100%; height: 100%; background: transparent;
    outline: none; margin: 0; z-index: 3; cursor: col-resize;
}

.slider::-webkit-slider-thumb {
    appearance: none; width: 4px; height: 100%; background: transparent; cursor: col-resize;
}

.slider-line {
    position: absolute; top: 0; left: 50%; width: 2px; height: 100%;
    background: white; z-index: 2; transform: translateX(-50%); pointer-events: none;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.slider-button {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 30px; height: 30px; background: white; color: var(--accent);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-weight: bold; box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.preview-labels {
    display: flex; justify-content: space-between; width: 100%; margin-top: 1rem; color: var(--text-muted);
}

/* =========================================
   Controls & Inputs
========================================= */
.controls-section { display: flex; flex-direction: column; gap: 1.5rem; }

.control-group label { display: block; margin-bottom: 0.5rem; font-weight: 500; }
.control-group input[type="range"] {
    width: 100%; accent-color: var(--accent); cursor: pointer;
}

.btn-group { display: flex; gap: 0.5rem; }
.btn-scale {
    flex: 1; padding: 0.5rem; background: rgba(255,255,255,0.1);
    border: 1px solid var(--glass-border); color: white; border-radius: 6px; cursor: pointer;
    transition: 0.3s;
}
.btn-scale.active, .btn-scale:hover { background: var(--accent); border-color: var(--purple-light); }

.checkbox-group label { display: flex; align-items: center; gap: 8px; font-weight: normal; cursor: pointer; margin-bottom: 0.5rem;}

.download-group { display: flex; gap: 1rem; align-items: center; }
.input-select {
    padding: 0.8rem; border-radius: 8px; background: rgba(0,0,0,0.3); border: 1px solid var(--glass-border);
    color: white; outline: none;
}

.btn-primary, .btn-secondary {
    padding: 0.8rem 1.5rem; border-radius: 8px; border: none; font-weight: bold;
    cursor: pointer; transition: 0.3s; width: 100%; font-size: 1rem;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--purple-light); }
.glow-btn { box-shadow: 0 0 15px var(--purple-glow); }
.glow-btn:hover { box-shadow: 0 0 25px var(--accent); }
.btn-secondary { background: transparent; border: 1px solid var(--text-muted); color: var(--text-muted); margin-top: auto;}
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: white; }

/* =========================================
   History Gallery
========================================= */
.history-section { margin-top: 2rem; }
.history-section h3 { margin-bottom: 1rem; color: var(--purple-light); }
.history-gallery { display: flex; gap: 1rem; overflow-x: auto; padding-bottom: 1rem; }
.history-item {
    min-width: 120px; height: 120px; border-radius: 8px; overflow: hidden;
    border: 1px solid var(--glass-border); position: relative;
}
.history-item img { width: 100%; height: 100%; object-fit: cover; }
.history-item .hist-date {
    position: absolute; bottom: 0; left: 0; width: 100%; background: rgba(0,0,0,0.7);
    font-size: 0.7rem; text-align: center; padding: 4px;
}

/* =========================================
   Responsive
========================================= */
@media (max-width: 900px) {
    .editor-layout { grid-template-columns: 1fr; }
    .download-group { flex-direction: column; }
    .input-select { width: 100%; }
}