/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #262626;
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;
    --accent: #8b5cf6;
    --accent-hover: #a78bfa;
    --accent-dim: #6d28d9;
    --success: #22c55e;
    --error: #ef4444;
    --border: #404040;
    --border-focus: #8b5cf6;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Layout ===== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

#editor-container {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

/* ===== Upload Zone ===== */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s ease;
    cursor: pointer;
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--accent);
    background: rgba(139, 92, 246, 0.05);
}

.upload-zone.drag-over {
    transform: scale(1.01);
}

.file-input {
    display: none;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--accent);
}

.upload-text {
    font-size: 1.1rem;
    color: var(--text-primary);
}

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

/* ===== Edit Form ===== */
.edit-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-container {
    position: relative;
    text-align: center;
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

.preview-label {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.edit-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group textarea {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.875rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.2s;
}

.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
}

.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    border: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

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

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

.btn-icon {
    width: 18px;
    height: 18px;
}

/* ===== Loading State ===== */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 3rem;
}

.spinner {
    position: relative;
    width: 60px;
    height: 60px;
}

.spinner-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-ring:nth-child(2) {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    animation-delay: -0.3s;
    border-top-color: var(--accent-hover);
}

.spinner-ring:nth-child(3) {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    animation-delay: -0.6s;
    border-top-color: var(--accent-dim);
}

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

.status-message {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.elapsed-time {
    font-family: 'SF Mono', Monaco, 'Consolas', monospace;
    font-size: 1.5rem;
    color: var(--accent);
}

/* ===== Result & Comparison Slider ===== */
.result-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.generation-info {
    text-align: center;
    color: var(--text-secondary);
}

.generation-info strong {
    color: var(--success);
}

.prompt-display {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9rem;
    padding: 0 1rem;
}

.comparison-slider {
    margin: 1rem 0;
}

.comparison-slider .image-container {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-sm);
    user-select: none;
}

.comparison-slider .result-image {
    display: block;
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.comparison-slider .result-image.loaded {
    opacity: 1;
}

.comparison-slider .image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: inset(0 50% 0 0);
}

.comparison-slider .original-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.comparison-slider .original-image.loaded {
    opacity: 1;
}

.comparison-slider .slider-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: ew-resize;
    z-index: 10;
    margin: 0;
}

.comparison-slider .slider-line {
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: white;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
    pointer-events: none;
    transform: translateX(-50%);
}

.comparison-slider .slider-handle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    pointer-events: none;
    color: var(--bg-primary);
}

.comparison-slider .slider-handle svg {
    width: 20px;
    height: 20px;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.result-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1rem;
}

/* ===== Upsell Banner ===== */
.upsell-banner {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(139, 92, 246, 0.05));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: var(--radius-sm);
    margin: 1rem 0;
}

.upsell-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.upsell-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
}

.upsell-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ===== Error State ===== */
.error-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
    text-align: center;
}

.error-icon {
    width: 48px;
    height: 48px;
    color: var(--error);
}

.error-message {
    color: var(--error);
    font-size: 1.1rem;
}

/* ===== Upload Progress ===== */
.upload-progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 3rem;
}

.progress-bar-container {
    width: 100%;
    max-width: 400px;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-hover) 100%);
    border-radius: 4px;
    width: 0%;
    transition: width 0.15s ease;
}

.progress-text {
    display: flex;
    gap: 1rem;
    color: var(--text-primary);
    font-family: 'SF Mono', Monaco, 'Consolas', monospace;
    font-size: 0.9rem;
}

.progress-status {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .upload-zone {
        padding: 2rem 1rem;
    }

    .form-actions,
    .result-actions {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
}