/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    color: #f0f0f0;
    min-height: 100vh;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.container {
    max-width: 1400px;
    width: 100%;
    background: rgba(30, 30, 46, 0.9);
    border-radius: 24px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid #444;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #00adb5;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    color: #00adb5;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

header .subtitle {
    font-size: 1.2rem;
    color: #aaa;
    max-width: 800px;
    margin: 0 auto;
}

/* Upload Section */
.upload-section {
    background: rgba(40, 40, 60, 0.8);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 40px;
    border: 2px dashed #444;
    transition: border-color 0.3s;
}

.upload-section:hover {
    border-color: #00adb5;
}

.upload-area {
    text-align: center;
    padding: 60px 20px;
    cursor: pointer;
    position: relative;
    transition: background 0.3s;
    border-radius: 16px;
    background: rgba(50, 50, 70, 0.5);
}

.upload-area:hover {
    background: rgba(60, 60, 80, 0.7);
}

.upload-area i {
    font-size: 5rem;
    color: #00adb5;
    margin-bottom: 20px;
}

.upload-area h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.upload-area p {
    color: #aaa;
    font-size: 1.1rem;
    margin-bottom: 20px;
}

#imageInput {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.gap-control {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(50, 50, 70, 0.8);
    padding: 12px 20px;
    border-radius: 10px;
    border: 1px solid #555;
}

.gap-control label {
    font-size: 1.1rem;
    color: #00d4ff;
    display: flex;
    align-items: center;
    gap: 8px;
}

.gap-control input {
    width: 80px;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid #666;
    background: #222;
    color: #fff;
    font-size: 1.1rem;
    text-align: center;
}

.gap-control input:focus {
    outline: none;
    border-color: #00adb5;
}


.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s;
}

.btn i {
    font-size: 1.2rem;
}

.btn.secondary {
    background: #555;
    color: #fff;
}

.btn.secondary:hover {
    background: #666;
}

.interaction-hint {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    color: #00d4ff;
    background: rgba(0, 212, 255, 0.1);
    padding: 12px 20px;
    border-radius: 10px;
    border: 1px solid #00d4ff;
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-bottom: 40px;
}

.screen-container {
    background: rgba(40, 40, 60, 0.8);
    border-radius: 20px;
    padding: 25px;
    border: 2px solid #444;
}

.screen-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.screen-header h2 {
    font-size: 1.8rem;
    color: #00d4ff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.save-btn {
    background: linear-gradient(90deg, #00adb5, #0097a7);
    color: white;
}

.save-btn:hover {
    background: linear-gradient(90deg, #0097a7, #00838f);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 173, 181, 0.4);
}

.screen-preview {
    position: relative;
    width: 100%;
    height: 400px;
    background: #222;
    border-radius: 12px;
    overflow: hidden;
    border: 3px solid #555;
    display: flex;
    justify-content: center;
    align-items: center;
}

.screen-preview canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: none;
    /* Remove absolute positioning, rely on flex centering */
    position: static;
}

.placeholder {
    text-align: center;
    color: #777;
}

.placeholder i {
    font-size: 4rem;
    margin-bottom: 15px;
    color: #555;
}

.placeholder p {
    font-size: 1.2rem;
}

.screen-info {
    margin-top: 15px;
    color: #aaa;
    font-style: italic;
    text-align: center;
}

/* Combined Preview */
.combined-preview {
    background: rgba(40, 40, 60, 0.8);
    border-radius: 20px;
    padding: 25px;
    margin-bottom: 40px;
    border: 2px solid #444;
}

.combined-preview h2 {
    font-size: 1.8rem;
    color: #00d4ff;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.combined-container {
    position: relative;
    width: 100%;
    height: 500px;
    background: #222;
    border-radius: 12px;
    overflow: hidden;
    border: 3px solid #555;
}

.combined-container canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: none;
    cursor: grab;
    touch-action: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.combined-info {
    margin-top: 15px;
    color: #aaa;
    font-style: italic;
    text-align: center;
}

/* Instructions */
.instructions {
    background: rgba(40, 40, 60, 0.8);
    border-radius: 20px;
    padding: 30px;
    border: 2px solid #444;
}

.instructions h3 {
    font-size: 1.8rem;
    color: #00d4ff;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.instructions ol {
    margin-left: 25px;
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.6;
}

.instructions li {
    margin-bottom: 10px;
    color: #ddd;
}

.instructions p {
    font-size: 1.1rem;
    color: #ddd;
    line-height: 1.6;
}

/* Footer */
footer {
    margin-top: 40px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #444;
    color: #888;
    font-size: 1rem;
}

footer i.fa-heart {
    color: #ff4757;
}

/* Responsive */
@media (max-width: 1100px) {
    .preview-section {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    header h1 {
        font-size: 2.2rem;
        flex-direction: column;
        gap: 10px;
    }
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    .screen-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .screen-preview, .combined-container {
        height: 300px;
    }
}