@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-main: #05080f; /* Darker to make glass pop */
    --bg-card: rgba(22, 30, 49, 0.5); /* Glassmorphism */
    --accent-green: #22c55e;
    --accent-green-hover: #16a34a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08); /* Glowing border effect */
    --shadow-glow: rgba(34, 197, 94, 0.25);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(34, 197, 94, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(34, 197, 94, 0.05), transparent 25%);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 24px;
}

.container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    width: 100%;
    max-width: 1000px;
    padding: 56px 48px;
    border-radius: 32px;
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    text-align: center;
}

header {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -1.5px;
    line-height: 1.2;
}

header h1 .highlight {
    background: linear-gradient(135deg, #2ae06b 0%, #16a34a 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

header p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 48px;
    font-weight: 400;
    max-width: 600px;
    line-height: 1.6;
}

.upload-box {
    border: 2px dashed rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 64px 24px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background-color: rgba(255, 255, 255, 0.02);
}

.upload-box:hover, .upload-box.dragover {
    border-color: var(--accent-green);
    background-color: rgba(34, 197, 94, 0.06);
    transform: translateY(-4px);
    box-shadow: 0 15px 35px var(--shadow-glow);
}

.upload-icon {
    color: var(--accent-green);
    margin-bottom: 24px;
    transition: transform 0.4s ease;
    filter: drop-shadow(0 0 12px var(--shadow-glow));
}

.upload-box:hover .upload-icon {
    transform: scale(1.15) translateY(-5px);
}

.upload-box h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.preview-section {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.image-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
    background: rgba(255, 255, 255, 0.015);
    padding: 32px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

@media (min-width: 850px) {
    .image-container {
        flex-direction: row;
        align-items: center;
        justify-content: center;
        gap: 64px;
        padding: 48px;
    }
}

.image-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    width: 100%;
}

.image-wrapper h4 {
    font-size: 13px;
    color: var(--accent-green);
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    background: rgba(34, 197, 94, 0.1);
    padding: 8px 20px;
    border-radius: 30px;
    border: 1px solid rgba(34, 197, 94, 0.25);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.15);
}

.image-wrapper canvas, .image-wrapper img {
    width: 100%;
    max-width: 400px;
    height: 300px;
    object-fit: contain;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: rgba(4, 8, 18, 0.4);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 0 20px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s ease;
}

.image-wrapper canvas:hover, .image-wrapper img:hover {
    transform: scale(1.03);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6), inset 0 0 20px rgba(0, 0, 0, 0.5);
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.action-panel {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
    margin-top: 10px;
}

button {
    padding: 16px 32px;
    border-radius: 16px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    white-space: nowrap;
    letter-spacing: 0.5px;
}

button:active {
    transform: scale(0.96) !important;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-green-hover) 100%);
    color: #020617; 
    box-shadow: 0 4px 15px var(--shadow-glow), inset 0 2px 0 rgba(255, 255, 255, 0.2);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    background: linear-gradient(135deg, #2ae06b 0%, #1cbe57 100%);
    box-shadow: 0 12px 30px rgba(34, 197, 94, 0.5), inset 0 2px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:disabled {
    background: rgba(255, 255, 255, 0.05);
    color: #475569;
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
    cursor: not-allowed;
}

.btn-secondary {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(255, 255, 255, 0.01) 100%);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-secondary:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.03) 100%);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), 0 0 15px rgba(255, 255, 255, 0.05);
}

.hidden {
    display: none !important;
}

/* Brush Controls */
.brush-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(255, 255, 255, 0.02);
    padding: 12px 24px;
    border-radius: 100px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin: -10px auto 10px auto;
    width: fit-content;
}

.brush-controls label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.brush-controls input[type="range"] {
    -webkit-appearance: none;
    width: 150px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    outline: none;
}

.brush-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-green);
    cursor: pointer;
    box-shadow: 0 0 10px var(--shadow-glow);
    transition: transform 0.2s;
}

.brush-controls input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Loader Overlay */
.loader-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(5, 8, 15, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.spinner {
    width: 56px;
    height: 56px;
    border: 4px solid rgba(34, 197, 94, 0.15);
    border-top-color: var(--accent-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.2);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-content p {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    letter-spacing: 0.5px;
    animation: pulse 1.5s ease-in-out infinite alternate;
}

@keyframes pulse {
    from { opacity: 0.6; }
    to { opacity: 1; text-shadow: 0 0 15px rgba(255, 255, 255, 0.3); }
}