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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-hover: #252542;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #2d2d4a;
    --success: #22c55e;
    --error: #ef4444;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Upload Zone */
.upload-zone {
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: 16px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: var(--bg-hover);
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: var(--primary);
    margin-bottom: 16px;
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.upload-hint {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Options */
.options {
    margin-top: 24px;
    margin-bottom: 30px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: 12px;
    cursor: pointer;
    border: 1px solid var(--border);
    transition: border-color 0.2s;
}

.checkbox-label:hover {
    border-color: var(--primary);
}

.checkbox-label input {
    display: none;
}

.checkmark {
    width: 22px;
    height: 22px;
    min-width: 22px;
    border: 2px solid var(--border);
    border-radius: 6px;
    position: relative;
    transition: all 0.2s;
}

.checkbox-label input:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-label input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.option-text {
    display: flex;
    flex-direction: column;
}

.option-text strong {
    font-weight: 600;
    color: var(--text);
}

.option-text small {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 2px;
}

/* Preview */
.preview {
    margin-bottom: 30px;
}

.preview h3 {
    margin-bottom: 16px;
    font-weight: 600;
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.preview-item {
    text-align: center;
}

.preview-item img {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 8px;
    background: var(--bg-card);
}

.preview-label {
    display: block;
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Phone Frame */
.phone-frame {
    position: relative;
    width: 120px;
    height: 260px;
    margin: 0 auto;
    background: #000;
    border-radius: 24px;
    padding: 8px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.phone-screen {
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 16px;
    background: var(--bg-card);
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.phone-notch {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 18px;
    background: #000;
    border-radius: 10px;
}

/* Progress */
.progress {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 30px;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 16px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), #a855f7);
    border-radius: 3px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; opacity: 1; }
    50% { width: 100%; opacity: 1; }
    100% { width: 100%; opacity: 0; }
}

.progress-text {
    color: var(--text-muted);
    margin-bottom: 20px;
}

.processing-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.step {
    color: var(--text-muted);
    font-size: 0.875rem;
    padding: 6px 12px;
    border-radius: 20px;
    transition: all 0.3s;
}

.step.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    font-weight: 500;
}

.step::before {
    content: '○ ';
}

.step.active::before {
    content: '● ';
}

/* Result */
.result {
    text-align: center;
}

.result-phone {
    width: 200px;
    height: 430px;
    margin: 0 auto 30px;
    background: #000;
    border-radius: 36px;
    padding: 12px;
    box-shadow: 0 20px 80px rgba(0,0,0,0.6);
}

.result-phone img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 24px;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--primary);
}

.result-info {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

.result-info strong {
    color: var(--text);
}

/* Error */
.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    color: #fca5a5;
    padding: 16px;
    border-radius: 12px;
    margin-top: 20px;
}

/* Footer */
footer {
    margin-top: 60px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Mobile */
@media (max-width: 600px) {
    .container {
        padding: 20px 16px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .upload-zone {
        padding: 40px 20px;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
    }
    
    .phone-frame {
        transform: scale(0.8);
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}