/**
 * Stylesheet: ai-client-side-background-remover.css
 * Tool 18: AI Client-Side Background Remover & Product Backdrop Studio
 * Strict 2-Column Desktop / 1-Column Mobile UI Layout
 *
 * @package MetaoFly
 */

/* ============================================================
   1. ROOT CONTAINER & HEADER BANNER
   ============================================================ */
.abr-workspace {
    width: 100%;
    max-width: 1360px;
    margin: 0 auto;
    padding: var(--space-4) 0 var(--space-12);
}

.abr-header-banner {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
    padding: var(--space-6);
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.08) 0%, rgba(56, 189, 248, 0.04) 100%);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: var(--radius-xl);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.abr-header-left {
    max-width: 820px;
}

.abr-badge-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(236, 72, 153, 0.15);
    color: #f472b6;
    border: 1px solid rgba(236, 72, 153, 0.3);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    margin-bottom: var(--space-2);
}

.abr-studio-title {
    font-size: clamp(1.6rem, 2.8vw, 2.2rem);
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin: 0 0 var(--space-2);
}

.abr-title-gradient {
    background: linear-gradient(135deg, #f472b6 0%, #38bdf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.abr-studio-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0;
}

.abr-quick-badges {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.abr-pill-stat {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.abr-pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 8px currentColor;
}

/* ============================================================
   2. UPLOAD DROPZONE STAGE
   ============================================================ */
.abr-upload-stage {
    margin-bottom: var(--space-8);
}

.abr-dropzone {
    position: relative;
    padding: var(--space-12) var(--space-6);
    background: radial-gradient(circle at center, rgba(236, 72, 153, 0.05) 0%, rgba(15, 23, 42, 0.6) 100%);
    border: 2px dashed rgba(236, 72, 153, 0.35);
    border-radius: var(--radius-2xl);
    text-align: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.abr-dropzone:hover,
.abr-dropzone.dragover {
    border-color: #ec4899;
    background: radial-gradient(circle at center, rgba(236, 72, 153, 0.12) 0%, rgba(15, 23, 42, 0.8) 100%);
    box-shadow: 0 0 35px rgba(236, 72, 153, 0.25);
    transform: translateY(-2px);
}

.abr-hidden-file-input {
    display: none;
}

.abr-drop-icon-wrap {
    position: relative;
    width: 84px;
    height: 84px;
    border-radius: 50%;
    background: rgba(236, 72, 153, 0.12);
    border: 1px solid rgba(236, 72, 153, 0.3);
    color: #f472b6;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
}

.abr-glow-ring {
    position: absolute;
    inset: -6px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.4) 0%, transparent 70%);
    animation: abrPulse 3s infinite ease-in-out;
}

@keyframes abrPulse {
    0%, 100% { transform: scale(0.95); opacity: 0.5; }
    50% { transform: scale(1.15); opacity: 0.85; }
}

.abr-drop-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-2);
}

.abr-drop-desc {
    max-width: 600px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0 0 var(--space-6);
}

.abr-drop-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: var(--space-6);
}

.abr-btn-browse {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #ec4899 0%, #db2777 100%);
    color: #fff;
    padding: 12px 28px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 6px 20px rgba(236, 72, 153, 0.35);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.abr-btn-browse:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(236, 72, 153, 0.5);
}

.abr-btn-sample {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.92rem;
    cursor: pointer;
    transition: all 0.2s;
}

.abr-btn-sample:hover {
    background: rgba(51, 65, 85, 0.9);
    border-color: rgba(236, 72, 153, 0.4);
}

.abr-drop-features {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    justify-content: center;
    font-size: 0.82rem;
    color: var(--text-tertiary);
}

.abr-drop-features span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ============================================================
   3. STUDIO TOP TOOLBAR
   ============================================================ */
.abr-top-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.abr-toolbar-file {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.abr-file-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
}

.abr-res-pill {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    background: rgba(255, 255, 255, 0.05);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
}

.abr-badge-cutout {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #10b981;
    padding: 3px 9px;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    font-weight: 700;
}

.abr-toolbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.abr-btn-small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    font-size: 0.82rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.abr-btn-small:hover {
    background: rgba(51, 65, 85, 0.9);
    border-color: rgba(236, 72, 153, 0.3);
}

/* ============================================================
   4. STRICT 2-COLUMN DESKTOP / 1-COLUMN MOBILE GRID
   ============================================================ */
.abr-grid-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(360px, 440px);
    gap: 28px;
    align-items: start;
}

@media (max-width: 1024px) {
    .abr-grid-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Common Card Styles */
.abr-card {
    background: rgba(15, 23, 42, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    margin-bottom: var(--space-4);
}

.abr-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.abr-step-tag {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #f472b6;
}

.abr-header-tip {
    font-size: 0.78rem;
    color: var(--text-tertiary);
}

/* ============================================================
   5. COLUMN 1: LIVE CANVAS VIEWPORT
   ============================================================ */
.abr-stage-card {
    padding: var(--space-4);
    position: relative;
}

.abr-bg-mode-label {
    font-size: 0.78rem;
    color: #38bdf8;
    font-weight: 600;
}

.abr-zoom-controls {
    display: flex;
    gap: 4px;
}

.abr-zoom-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
}

.abr-zoom-btn.active {
    background: rgba(236, 72, 153, 0.2);
    border-color: #ec4899;
    color: #f472b6;
}

/* Viewport with Transparency Checkerboard */
.abr-viewport-container {
    position: relative;
    width: 100%;
    min-height: 440px;
    max-height: 640px;
    background-color: #0b1120;
    background-image: 
        linear-gradient(45deg, #161f30 25%, transparent 25%),
        linear-gradient(-45deg, #161f30 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #161f30 75%),
        linear-gradient(-45deg, transparent 75%, #161f30 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    -webkit-user-select: none;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 0 25px rgba(0, 0, 0, 0.7);
}

.abr-canvas-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 100%;
    max-height: 100%;
}

.abr-canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    display: block;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    cursor: crosshair;
}

/* Interactive Brush Cursor Ring */
.abr-brush-cursor {
    position: absolute;
    border-radius: 50%;
    border: 2px solid #ec4899;
    box-shadow: 0 0 8px rgba(236, 72, 153, 0.6);
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 20;
}

/* Progress Overlay */
.abr-progress-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.88);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}

.abr-progress-box {
    max-width: 420px;
    width: 100%;
    text-align: center;
}

.abr-spinner-wrap {
    margin-bottom: var(--space-4);
    display: flex;
    justify-content: center;
}

.abr-neural-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(236, 72, 153, 0.2);
    border-top-color: #ec4899;
    border-right-color: #38bdf8;
    border-radius: 50%;
    animation: abrSpin 1s linear infinite;
}

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

.abr-progress-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-1);
}

.abr-progress-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0 0 var(--space-4);
}

.abr-progress-track {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-2);
}

.abr-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ec4899 0%, #38bdf8 100%);
    border-radius: var(--radius-full);
    transition: width 0.15s ease-out;
}

.abr-progress-pct {
    font-weight: 700;
    color: #f472b6;
    font-size: 0.85rem;
}

.abr-stage-footer {
    margin-top: var(--space-3);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.abr-footer-hint {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    line-height: 1.4;
}

.abr-trust-banner {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-radius: var(--radius-lg);
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--text-secondary);
}

.abr-trust-text strong {
    color: #10b981;
}

/* ============================================================
   6. COLUMN 2: CONTROLS & STYLING
   ============================================================ */
.abr-control-card {
    margin-bottom: var(--space-4);
}

.abr-btn-link {
    background: none;
    border: none;
    color: #f472b6;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0;
}

.abr-btn-link:hover {
    text-decoration: underline;
}

/* Subject Selector Pills */
.abr-subject-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.abr-sub-pill {
    position: relative;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    padding: 10px 12px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.abr-sub-pill:hover {
    border-color: rgba(236, 72, 153, 0.4);
    background: rgba(51, 65, 85, 0.7);
}

.abr-sub-pill.active {
    background: rgba(236, 72, 153, 0.15);
    border-color: #ec4899;
    color: #f472b6;
}

.abr-radio-hidden {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

/* Brush Tools */
.abr-brush-tools {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.abr-tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 10px 8px;
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.abr-tool-btn:hover {
    background: rgba(51, 65, 85, 0.8);
    border-color: rgba(236, 72, 153, 0.4);
}

.abr-tool-btn.active {
    background: rgba(236, 72, 153, 0.18);
    border-color: #ec4899;
    color: #f472b6;
    box-shadow: 0 0 12px rgba(236, 72, 153, 0.3);
}

/* Sliders */
.abr-slider-group {
    margin-bottom: var(--space-3);
}

.abr-slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    font-size: 0.84rem;
}

.abr-slider-header label {
    font-weight: 600;
    color: var(--text-primary);
}

.abr-slider-val {
    font-weight: 700;
    color: #38bdf8;
    font-size: 0.82rem;
}

.abr-range {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    -webkit-appearance: none;
}

.abr-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #ec4899;
    border: 2px solid #fff;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(236, 72, 153, 0.6);
}

.abr-range::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #ec4899;
    border: 2px solid #fff;
    cursor: pointer;
}

/* Background Replacer Tabs */
.abr-tab-pills {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    margin-bottom: var(--space-4);
}

.abr-tab-btn {
    padding: 7px 4px;
    background: rgba(30, 41, 59, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.abr-tab-btn:hover {
    border-color: rgba(236, 72, 153, 0.35);
}

.abr-tab-btn.active {
    background: rgba(236, 72, 153, 0.2);
    border-color: #ec4899;
    color: #f472b6;
}

.abr-panel-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.45;
    margin: 0;
}

/* Color & Gradient Grids */
.abr-color-grid,
.abr-grad-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    align-items: center;
}

.abr-color-swatch,
.abr-grad-swatch {
    width: 100%;
    height: 38px;
    border-radius: var(--radius-md);
    border: 2px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
    transition: transform 0.15s, border-color 0.15s;
}

.abr-color-swatch:hover,
.abr-grad-swatch:hover {
    transform: scale(1.08);
    border-color: #fff;
}

.abr-color-swatch.active,
.abr-grad-swatch.active {
    border-color: #ec4899;
    box-shadow: 0 0 10px rgba(236, 72, 153, 0.7);
    transform: scale(1.05);
}

.abr-custom-color-input {
    width: 100%;
    height: 38px;
    padding: 2px;
    background: transparent;
    border: 2px dashed rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-md);
    cursor: pointer;
}

/* Toggle Row (Shadow) */
.abr-toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.abr-toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

.abr-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #ec4899;
}

.abr-shadow-settings {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Outline Control */
.abr-outline-control-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.abr-outline-color-picker {
    width: 38px;
    height: 32px;
    padding: 2px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

/* Buttons Full */
.abr-btn-full {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 20px;
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.abr-btn-download {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

.abr-btn-download:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
    transform: translateY(-1px);
}

.abr-btn-copy {
    background: rgba(30, 41, 59, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
}

.abr-btn-copy:hover {
    background: rgba(51, 65, 85, 0.95);
    border-color: rgba(236, 72, 153, 0.4);
}

/* Export Options */
.abr-export-options {
    margin-bottom: var(--space-3);
}

.abr-field-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.abr-field-label {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-primary);
}

.abr-select {
    width: 100%;
    padding: 10px 12px;
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
}

.abr-select:focus {
    border-color: #ec4899;
}