/* ===== IMPORTS & FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
    /* Colors - Dark industrial palette with vibrant accents */
    --color-bg-primary: #0a0e14;
    --color-bg-secondary: #121922;
    --color-bg-tertiary: #1a222d;
    --color-surface: #1e2833;
    --color-surface-elevated: #252e3d;
    
    --color-text-primary: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-text-muted: #6e7681;
    
    --color-accent: #00d9ff;
    --color-accent-bright: #00ffea;
    --color-accent-dark: #0099cc;
    --color-success: #3fb950;
    --color-warning: #d29922;
    --color-error: #f85149;
    
    --color-border: #30363d;
    --color-border-muted: #21262d;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #00d9ff 0%, #0099cc 100%);
    --gradient-mesh: radial-gradient(at 0% 0%, rgba(0, 217, 255, 0.1) 0px, transparent 50%),
                     radial-gradient(at 100% 0%, rgba(0, 153, 204, 0.08) 0px, transparent 50%),
                     radial-gradient(at 100% 100%, rgba(0, 255, 234, 0.05) 0px, transparent 50%);
    
    /* Typography */
    --font-display: 'Outfit', -apple-system, system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 217, 255, 0.3);
    
    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-display);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-mesh);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

/* ===== HEADER ===== */
.main-header {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 20, 0.9);
}

.header-content {
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo svg {
    color: var(--color-accent);
    filter: drop-shadow(0 0 10px rgba(0, 217, 255, 0.5));
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 10px rgba(0, 217, 255, 0.5)); }
    50% { transform: scale(1.05); filter: drop-shadow(0 0 20px rgba(0, 217, 255, 0.7)); }
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* ===== LANGUAGE SELECTOR ===== */
.language-selector {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
}

.language-selector select {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: 0.95rem;
    padding: 0.5rem 2rem 0.5rem 1rem;
    cursor: pointer;
    transition: var(--transition-base);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%2300d9ff' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
}

.language-selector select:hover {
    border-color: var(--color-accent);
    background-color: var(--color-surface-elevated);
}

.language-selector select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* ===== UPLOAD SECTION ===== */
.upload-section {
    margin-bottom: var(--spacing-xl);
}

.upload-zone {
    background: var(--color-surface);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg at 50% 50%, 
                               transparent 0deg, 
                               rgba(0, 217, 255, 0.1) 90deg, 
                               transparent 180deg,
                               rgba(0, 217, 255, 0.1) 270deg,
                               transparent 360deg);
    animation: rotate 20s linear infinite;
    opacity: 0;
    transition: var(--transition-base);
}

@keyframes rotate {
    100% { transform: rotate(360deg); }
}

.upload-zone:hover {
    border-color: var(--color-accent);
    background: var(--color-surface-elevated);
    box-shadow: var(--shadow-glow);
}

.upload-zone:hover::before {
    opacity: 1;
}

.upload-zone.dragover {
    border-color: var(--color-accent-bright);
    background: var(--color-bg-tertiary);
    transform: scale(1.02);
}

.upload-placeholder svg {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    filter: drop-shadow(0 0 10px rgba(0, 217, 255, 0.3));
}

.upload-placeholder h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.upload-placeholder p {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.upload-info {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.image-preview {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.image-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-md);
}

.change-image-container {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-md);
}

/* ===== PARAMETERS SECTION ===== */
.parameters-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.parameters-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-accent);
    position: relative;
    display: inline-block;
}

.parameters-section h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.param-group {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: var(--transition-base);
}

.param-group:hover {
    border-color: var(--color-accent);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.1);
}

.param-group h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.param-group h3::before {
    content: '';
    width: 4px;
    height: 20px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.param-row {
    margin-bottom: var(--spacing-md);
}

.param-row:last-of-type {
    margin-bottom: 0;
}

.param-row label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    letter-spacing: 0.01em;
}

.param-row input[type="number"],
.param-row input[type="text"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    font-size: 1rem;
    transition: var(--transition-base);
}

.param-row input[type="number"]:focus,
.param-row input[type="text"]:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.color-picker {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    transition: var(--transition-base);
}

.color-picker:focus-within {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.color-picker input[type="color"] {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.color-picker span {
    font-family: var(--font-mono);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.checkbox-row {
    display: flex;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

.checkbox-label span {
    color: var(--color-text-primary);
    font-weight: 500;
}

.param-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(0, 217, 255, 0.05);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* ===== PROCESSING WARNING ===== */
.processing-warning {
    background: rgba(217, 153, 34, 0.1);
    border: 2px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: pulse-warning 2s ease-in-out infinite;
}

@keyframes pulse-warning {
    0%, 100% { 
        border-color: var(--color-warning);
        background: rgba(217, 153, 34, 0.1);
    }
    50% { 
        border-color: rgba(217, 153, 34, 0.8);
        background: rgba(217, 153, 34, 0.15);
    }
}

.processing-warning svg {
    flex-shrink: 0;
    color: var(--color-warning);
    filter: drop-shadow(0 0 8px rgba(217, 153, 34, 0.5));
}

.processing-warning p {
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 500;
    margin: 0;
    line-height: 1.5;
}

/* ===== BUTTONS ===== */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

.btn-primary,
.btn-secondary,
.btn-change {
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-primary:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-text, .btn-loader {
    position: relative;
    z-index: 1;
}

.btn-loader {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-loader .spinner {
    animation: spin 1s linear infinite;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.8));
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.btn-loader .spinner circle {
    stroke-dashoffset: 15;
    animation: dash 1.5s ease-in-out infinite;
}

@keyframes dash {
    0% { stroke-dashoffset: 60; }
    50% { stroke-dashoffset: 15; }
    100% { stroke-dashoffset: 60; }
}

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

.btn-secondary:hover {
    background: var(--color-surface-elevated);
    border-color: var(--color-accent);
}

.btn-change {
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-change:hover {
    background: var(--color-surface);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ===== RESULTS SECTION ===== */
.results-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    animation: slideInUp 0.5s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-accent);
    position: relative;
    display: inline-block;
}

.results-section h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-panel {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.result-panel h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.preview-container {
    position: relative;
    background: var(--color-bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.preview-container img {
    width: 100%;
    display: block;
    transition: var(--transition-base);
}

.preview-zoom {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
}

.preview-zoom button {
    width: 40px;
    height: 40px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.preview-zoom button:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.stats-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--color-bg-primary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent);
}

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

.stat-value {
    color: var(--color-accent);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
}

/* ===== DOWNLOADS SECTION ===== */
.downloads-section {
    margin-top: var(--spacing-xl);
}

.downloads-section h3 {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.download-item {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: var(--transition-base);
    text-decoration: none;
    color: var(--color-text-primary);
}

.download-item:hover {
    border-color: var(--color-accent);
    background: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.2);
}

.download-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.download-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.download-type {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.download-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

/* ===== INFO SECTION ===== */
.info-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border);
}

.info-section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--color-text-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition-base);
}

.info-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.info-card:hover::before {
    transform: scaleX(1);
}

.info-number {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.8rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.info-card h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.info-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== FOOTER ===== */
.main-footer {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-2xl);
    text-align: center;
}

.main-footer p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-2xl);
    min-width: 300px;
    max-width: 500px;
    animation: slideInRight 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    pointer-events: auto;
    font-weight: 500;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    background: #1e4620;
    border-color: #2ea043;
    border-left: 4px solid #2ea043;
}

.toast.success .toast-message {
    color: #ffffff;
}

.toast.error {
    background: #86181d;
    border-color: #f85149;
    border-left: 4px solid #f85149;
}

.toast.error .toast-message {
    color: #ffffff;
    font-weight: 600;
}

.toast.warning {
    background: #4d3800;
    border-color: #d29922;
    border-left: 4px solid #d29922;
}

.toast.warning .toast-message {
    color: #ffffff;
}

.toast.info {
    background: #0c2d6b;
    border-color: #1f6feb;
    border-left: 4px solid #1f6feb;
}

.toast.info .toast-message {
    color: #ffffff;
}

.toast-message {
    flex: 1;
    color: var(--color-text-primary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2rem;
    }
    
    .params-grid,
    .results-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .toast-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .toast {
        min-width: auto;
    }
}

/* ===== UTILITY CLASSES ===== */
.hidden {
    display: none !important;
}

.loading {
    pointer-events: none;
    opacity: 0.6;
}


/* =================================================================
   IMAGE ADJUSTMENTS SECTION
   ================================================================= */

.adjustments-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    /* subtle accent top-bar */
    border-top: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
}

.adjustments-section::before {
    content: '';
    position: absolute;
    top: -2px; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), #7c3aed, var(--color-accent-bright));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* --- Header bar --- */
.adj-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border-muted);
    background: var(--color-bg-secondary);
}

.adj-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.adj-title-row svg {
    color: var(--color-accent);
    flex-shrink: 0;
}

.adj-title-row h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
}

.adj-header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-adj-reset {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-adj-reset:hover {
    border-color: var(--color-warning);
    color: var(--color-warning);
    background: rgba(210, 153, 34, 0.08);
}

.btn-adj-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.9rem;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-adj-toggle:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.adj-toggle-arrow {
    transition: transform 0.3s ease;
}

.adj-toggle-arrow.is-open {
    transform: rotate(180deg);
}

/* --- Collapsible body --- */
.adj-body {
    padding: var(--spacing-lg);
    /* smooth collapse */
    transition: max-height 0.4s cubic-bezier(0.4,0,0.2,1),
                opacity 0.3s ease,
                padding 0.3s ease;
    overflow: hidden;
}

.adj-body.is-collapsed {
    max-height: 0 !important;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
}

/* --- Two-column layout --- */
.adj-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

/* --- Preview column --- */
.adj-preview-col {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    position: sticky;
    top: 90px; /* stick below header */
}

.adj-preview-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 0.4rem;
}

.adj-preview-box {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    /* checkerboard bg shows transparency */
    background-image:
        linear-gradient(45deg, #1a1a2e 25%, transparent 25%),
        linear-gradient(-45deg, #1a1a2e 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #1a1a2e 75%),
        linear-gradient(-45deg, transparent 75%, #1a1a2e 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.adj-preview-box img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.adj-preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    color: var(--color-text-muted);
    font-size: 0.82rem;
    text-align: center;
    padding: var(--spacing-md);
}

.adj-preview-placeholder svg {
    opacity: 0.4;
}

.adj-preview-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10,14,20,0.7);
    backdrop-filter: blur(4px);
}

.adj-spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: adjSpin 0.7s linear infinite;
}

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

/* Histogram */
.adj-histogram-wrap {
    display: flex;
    flex-direction: column;
}

#adjHistCanvas {
    width: 100%;
    height: 70px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-muted);
    display: block;
}

/* --- Sliders column --- */
.adj-sliders-col {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Slider group */
.adj-group {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: border-color 0.2s;
}

.adj-group:focus-within {
    border-color: rgba(0, 217, 255, 0.4);
}

.adj-group-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.adj-group-title svg {
    opacity: 0.85;
    flex-shrink: 0;
}

/* Individual slider row */
.adj-slider-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 0.75rem;
}

.adj-slider-row:last-child {
    margin-bottom: 0;
}

.adj-slider-row label {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.adj-slider-wrap {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

/* Custom range slider */
.adj-slider {
    -webkit-appearance: none;
    appearance: none;
    flex: 1;
    height: 4px;
    border-radius: 2px;
    background: var(--color-border);
    outline: none;
    cursor: pointer;
    transition: background 0.15s;
}

.adj-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: 2px solid var(--color-bg-primary);
    box-shadow: 0 0 6px rgba(0, 217, 255, 0.5);
    transition: transform 0.15s, box-shadow 0.15s;
}

.adj-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    cursor: pointer;
    border: 2px solid var(--color-bg-primary);
    box-shadow: 0 0 6px rgba(0, 217, 255, 0.5);
}

.adj-slider:hover::-webkit-slider-thumb,
.adj-slider:focus::-webkit-slider-thumb {
    transform: scale(1.25);
    box-shadow: 0 0 10px rgba(0, 217, 255, 0.7);
}

/* Shadow variant — dark track */
.adj-slider--shadow {
    background: linear-gradient(to right, #0a0a0a, var(--color-border));
}

.adj-slider--shadow::-webkit-slider-thumb {
    background: #888;
    box-shadow: 0 0 6px rgba(100,100,100,0.5);
}

/* Highlight variant — light track */
.adj-slider--highlight {
    background: linear-gradient(to right, var(--color-border), #f0f0f0);
}

.adj-slider--highlight::-webkit-slider-thumb {
    background: #e0e0e0;
    box-shadow: 0 0 6px rgba(200,200,200,0.6);
}

.adj-value {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-accent);
    min-width: 3.2rem;
    text-align: right;
    font-weight: 600;
    background: rgba(0,217,255,0.07);
    border-radius: 4px;
    padding: 2px 5px;
}

/* Toggle (invert switch) */
.adj-toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.5rem;
    margin-top: 0.25rem;
    border-top: 1px solid var(--color-border-muted);
}

.adj-toggle-row label:first-child {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.adj-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    cursor: pointer;
}

.adj-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.adj-switch-track {
    position: absolute;
    inset: 0;
    background: var(--color-border);
    border-radius: 11px;
    transition: background 0.25s;
}

.adj-switch-track::after {
    content: '';
    position: absolute;
    left: 3px;
    top: 3px;
    width: 16px;
    height: 16px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    transition: transform 0.25s, background 0.25s;
}

.adj-switch input:checked + .adj-switch-track {
    background: var(--color-accent);
}

.adj-switch input:checked + .adj-switch-track::after {
    transform: translateX(18px);
    background: white;
}

/* Note at bottom */
.adj-note {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: var(--spacing-md);
    padding: 0.75rem var(--spacing-md);
    background: rgba(0, 217, 255, 0.05);
    border: 1px solid rgba(0, 217, 255, 0.15);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.adj-note svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--color-accent);
    opacity: 0.7;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .adj-layout {
        grid-template-columns: 1fr;
    }

    .adj-preview-col {
        position: static;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 600px) {
    .adj-preview-col {
        grid-template-columns: 1fr;
    }

    .adj-slider-row {
        grid-template-columns: 1fr;
        gap: 0.3rem;
    }

    .adj-slider-row label {
        white-space: normal;
    }

    .adj-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

/* Slider fill track via CSS custom property set by JS */
.adj-slider {
    background: linear-gradient(
        to right,
        var(--color-accent) 0%,
        var(--color-accent) var(--pct, 50%),
        var(--color-border) var(--pct, 50%),
        var(--color-border) 100%
    ) !important;
}

.adj-slider--shadow {
    background: linear-gradient(
        to right,
        #555 0%,
        #555 var(--pct, 0%),
        #1a1a1a var(--pct, 0%),
        #1a1a1a 100%
    ) !important;
}

.adj-slider--highlight {
    background: linear-gradient(
        to right,
        #aaa 0%,
        #aaa var(--pct, 100%),
        var(--color-border) var(--pct, 100%),
        var(--color-border) 100%
    ) !important;
}