/* ============================================
   GIF Background Remover - Stylesheet
   Green Theme (#339966) | Dark Mode Support
   All classes prefixed gbr- to avoid conflicts
   ============================================ */

/* ---- Variables: Light Mode ---- */
:root {
    --gbr-primary:        #339966;
    --gbr-primary-light:  #e8f5ee;
    --gbr-primary-dark:   #2d8659;
    --gbr-success:        #339966;
    --gbr-success-light:  #e8f5ee;
    --gbr-danger:         #e64e4e;
    --gbr-danger-light:   #fee2e2;
    --gbr-warning:        #f59e0b;
    --gbr-warning-light:  #fef3c7;

    --gbr-bg:             #f4f7fb;
    --gbr-bg-elevated:    #ffffff;
    --gbr-bg-secondary:   #f1f5f9;
    --gbr-bg-tertiary:    #e2e8f0;

    --gbr-text:           #1e293b;
    --gbr-text-secondary: #475569;
    --gbr-text-muted:     #64748b;

    --gbr-border:         #e2e8f0;
    --gbr-border-light:   #f1f5f9;

    --gbr-shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
    --gbr-shadow-md:  0 4px 6px -1px rgba(0,0,0,0.1);
    --gbr-shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.1);
    --gbr-shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.1);
    --gbr-shadow-p:   0 4px 14px rgba(51,153,102,0.25);
    --gbr-shadow-ph:  0 6px 20px rgba(51,153,102,0.35);

    --gbr-radius-sm:   6px;
    --gbr-radius-md:   12px;
    --gbr-radius-lg:   16px;
    --gbr-radius-xl:   24px;
    --gbr-radius-full: 9999px;

    --gbr-checker-a: #f0f0f0;
    --gbr-checker-b: #e0e0e0;
    --gbr-input-bg:  #ffffff;
    --gbr-input-bdr: #b7ddc8;
    --gbr-speed:     0.25s;
}

/* ---- Variables: Dark Mode ---- */
[data-theme="dark"] {
    --gbr-primary:        #4ade80;
    --gbr-primary-light:  rgba(74,222,128,0.15);
    --gbr-primary-dark:   #22c55e;
    --gbr-success:        #4ade80;
    --gbr-success-light:  rgba(74,222,128,0.15);
    --gbr-danger:         #f87171;
    --gbr-danger-light:   rgba(248,113,113,0.15);
    --gbr-warning-light:  rgba(251,191,36,0.12);

    --gbr-bg:             #0f172a;
    --gbr-bg-elevated:    #1e293b;
    --gbr-bg-secondary:   #334155;
    --gbr-bg-tertiary:    #475569;

    --gbr-text:           #f1f5f9;
    --gbr-text-secondary: #cbd5e1;
    --gbr-text-muted:     #94a3b8;

    --gbr-border:        #334155;
    --gbr-border-light:  #475569;

    --gbr-shadow-sm:  0 1px 3px rgba(0,0,0,0.3);
    --gbr-shadow-md:  0 4px 6px -1px rgba(0,0,0,0.4);
    --gbr-shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.4);
    --gbr-shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.5);
    --gbr-shadow-p:   0 4px 14px rgba(74,222,128,0.2);
    --gbr-shadow-ph:  0 6px 20px rgba(74,222,128,0.3);

    --gbr-checker-a: #334155;
    --gbr-checker-b: #475569;
    --gbr-input-bg:  #334155;
    --gbr-input-bdr: #475569;
}

/* ---- Base ---- */
* { box-sizing: border-box; }

/* ============================================
   LAYOUT
   ============================================ */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* ============================================
   HEADER
   ============================================ */
.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.gbr-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.gbr-icon-wrap {
    width: 48px; height: 48px;
    background: var(--gbr-primary-light);
    border-radius: var(--gbr-radius-md);
    display: flex; align-items: center; justify-content: center;
    color: var(--gbr-primary);
    flex-shrink: 0;
    transition: background var(--gbr-speed);
}
.gbr-icon-wrap svg,
.gbr-icon-wrap i { width: 26px; height: 26px; }

.gbr-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    color: var(--gbr-primary);
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.05rem;
    color: var(--gbr-text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
    text-align: center;
}
.tool-description a { color: var(--gbr-primary); text-decoration: none; font-weight: 500; }
.tool-description a:hover { text-decoration: underline; }

/* ============================================
   MAIN TOOL AREA
   ============================================ */
.tool-main {
    background: var(--gbr-bg-elevated);
    border-radius: var(--gbr-radius-lg);
    box-shadow: none;
    overflow: visible !important;
    border: 1px solid var(--gbr-border);
    margin-bottom: 2rem;
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
    position: relative;
}

/* ============================================
   UPLOAD SECTION
   ============================================ */
.gbr-upload-section { padding: 3rem; }

.gbr-upload-area {
    border: 2px dashed var(--gbr-border);
    border-radius: var(--gbr-radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--gbr-bg-secondary);
    position: relative;
    overflow: hidden;
}
.gbr-upload-area::before {
    content: '';
    position: absolute; inset: 0;
    background: var(--gbr-primary-light);
    opacity: 0; transition: opacity 0.3s;
}
.gbr-upload-area:hover,
.gbr-upload-area.dragover {
    border-color: var(--gbr-primary);
    background: var(--gbr-bg);
    transform: translateY(-2px);
    box-shadow: var(--gbr-shadow-md);
}
.gbr-upload-area:hover::before,
.gbr-upload-area.dragover::before { opacity: 0.5; }

.gbr-upload-content { position: relative; z-index: 1; }

.gbr-upload-icon {
    color: var(--gbr-primary);
    margin-bottom: 1.5rem;
    transition: transform 0.3s;
}
.gbr-upload-area:hover .gbr-upload-icon { transform: translateY(-5px); }

.gbr-upload-title { font-size: 1.5rem; font-weight: 600; color: var(--gbr-text); margin: 0 0 0.5rem; }
.gbr-upload-sub   { color: var(--gbr-text-secondary); margin: 0 0 1rem; font-size: 1rem; }

.gbr-file-types {
    display: flex; gap: 0.5rem;
    justify-content: center; flex-wrap: wrap;
    margin-bottom: 1rem;
}
.gbr-badge {
    background: var(--gbr-primary-light);
    color: var(--gbr-primary);
    padding: 0.35rem 0.85rem;
    border-radius: var(--gbr-radius-full);
    font-size: 0.8rem; font-weight: 600;
    transition: background var(--gbr-speed);
}

.gbr-upload-hint {
    display: inline-flex; align-items: center; gap: 0.4rem;
    color: var(--gbr-text-muted); font-size: 0.875rem;
}

/* ============================================
   PREPROCESSING WARNING BANNER
   ============================================ */
.gbr-pp-warning {
    display: none;
    align-items: flex-start; gap: 0.75rem;
    margin: 0 2rem 0;
    padding: 0.85rem 1.1rem;
    background: var(--gbr-warning-light);
    border-radius: var(--gbr-radius-md);
    border: 1px solid rgba(245,158,11,0.25);
}
.gbr-pp-warning svg, .gbr-pp-warning i {
    color: var(--gbr-warning); flex-shrink: 0;
    width: 16px; height: 16px; margin-top: 2px;
}
.gbr-pp-warning p {
    margin: 0; font-size: 0.84rem;
    color: var(--gbr-text-secondary); line-height: 1.5;
}
[data-theme="dark"] .gbr-pp-warning {
    background: rgba(245,158,11,0.1);
    border-color: rgba(245,158,11,0.2);
}

/* ============================================
   ERROR / NOTICE CARDS
   ============================================ */
.gbr-error-display {
    display: flex; flex-direction: column;
    gap: 0;
    border-radius: var(--gbr-radius-lg);
    margin: 0 2rem 1.5rem;
    overflow: hidden;
    box-shadow: var(--gbr-shadow-sm);
}

.gbr-error-display .gbr-err-body {
    display: flex; align-items: flex-start;
    gap: 0.875rem;
    padding: 1rem 1.25rem;
    background: var(--gbr-danger-light);
}
.gbr-error-display .gbr-err-icon {
    flex-shrink: 0;
    width: 36px; height: 36px;
    border-radius: var(--gbr-radius-md);
    background: var(--gbr-danger);
    display: flex; align-items: center; justify-content: center;
    margin-top: 1px;
}
.gbr-error-display .gbr-err-icon svg,
.gbr-error-display .gbr-err-icon i { width: 18px; height: 18px; color: white; }

.gbr-error-display .gbr-err-text {
    display: flex; flex-direction: column; gap: 0.2rem; flex: 1;
}
.gbr-error-display .gbr-err-title {
    font-size: 0.9rem; font-weight: 700;
    color: var(--gbr-danger); line-height: 1.3;
}
.gbr-error-display .gbr-err-msg {
    font-size: 0.875rem; color: var(--gbr-text-secondary);
    line-height: 1.6; margin: 0;
}
.gbr-error-display .gbr-err-actions {
    display: flex; flex-wrap: wrap; align-items: center;
    gap: 0.5rem; padding: 0.75rem 1.25rem;
    background: var(--gbr-bg-secondary);
}
.gbr-error-display .gbr-err-actions a.gbr-err-btn {
    display: inline-flex; align-items: center; gap: 0.35rem;
    padding: 0.35rem 0.85rem;
    background: var(--gbr-bg-elevated);
    border: 1px solid var(--gbr-border);
    border-radius: var(--gbr-radius-full);
    font-size: 0.8rem; font-weight: 600;
    color: var(--gbr-text); text-decoration: none;
    transition: all 0.2s;
}
.gbr-error-display .gbr-err-actions a.gbr-err-btn:hover {
    border-color: var(--gbr-primary); color: var(--gbr-primary);
    background: var(--gbr-primary-light);
}
.gbr-error-display .gbr-err-actions a.gbr-err-btn svg,
.gbr-error-display .gbr-err-actions a.gbr-err-btn i { width: 13px; height: 13px; }
.gbr-error-display .gbr-err-contact {
    margin-left: auto; font-size: 0.78rem;
    color: var(--gbr-text-muted); white-space: nowrap;
}
.gbr-error-display .gbr-err-contact a,
.gbr-error-display .gbr-err-contact-only a {
    color: var(--gbr-text-secondary); font-weight: 600; text-decoration: none;
}
.gbr-error-display .gbr-err-contact a:hover,
.gbr-error-display .gbr-err-contact-only a:hover { color: var(--gbr-primary); text-decoration: underline; }
.gbr-error-display .gbr-err-actions-simple { padding: 0.6rem 1.25rem; }
.gbr-error-display .gbr-err-contact-only { font-size: 0.82rem; color: var(--gbr-text-muted); }

/* Variants */
.gbr-error-warning .gbr-err-body  { background: var(--gbr-warning-light); }
.gbr-error-warning .gbr-err-icon  { background: #d97706; }
.gbr-error-warning .gbr-err-title { color: #92400e; }
[data-theme="dark"] .gbr-error-warning .gbr-err-body  { background: rgba(251,191,36,0.1); }
[data-theme="dark"] .gbr-error-warning .gbr-err-title { color: #fbbf24; }

.gbr-error-info .gbr-err-body  { background: #eff6ff; }
.gbr-error-info .gbr-err-icon  { background: #3b82f6; }
.gbr-error-info .gbr-err-title { color: #1e40af; }
[data-theme="dark"] .gbr-error-info .gbr-err-body  { background: rgba(59,130,246,0.1); }
[data-theme="dark"] .gbr-error-info .gbr-err-title { color: #60a5fa; }

[data-theme="dark"] .gbr-error-display .gbr-err-body    { background: rgba(248,113,113,0.1); }
[data-theme="dark"] .gbr-error-display .gbr-err-title   { color: #f87171; }
[data-theme="dark"] .gbr-error-display .gbr-err-actions { background: var(--gbr-bg-secondary); }

/* ============================================
   PREVIEW AREA
   ============================================ */
.gbr-preview-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.75rem 2rem;
    border-bottom: 1px solid var(--gbr-border);
    transition: border-color var(--gbr-speed);
}

.gbr-preview-box {
    display: flex; flex-direction: column; gap: 0.6rem;
}

.gbr-preview-label {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: 0.75rem; font-weight: 700;
    color: var(--gbr-text-muted);
    text-transform: uppercase; letter-spacing: 0.06em;
}
.gbr-preview-label svg, .gbr-preview-label i {
    width: 13px; height: 13px; color: var(--gbr-primary);
}

.gbr-preview-container {
    flex: 1; min-height: 180px; max-height: 280px;
    border-radius: var(--gbr-radius-md);
    border: 1px solid var(--gbr-border);
    background: var(--gbr-bg-secondary);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden; position: relative;
    transition: border-color var(--gbr-speed), background var(--gbr-speed);
}
.gbr-preview-container img {
    max-width: 100%; max-height: 100%;
    object-fit: contain; display: block;
}

.gbr-transparent-bg {
    background-image:
        linear-gradient(45deg, var(--gbr-checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--gbr-checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--gbr-checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--gbr-checker-a) 75%);
    background-size: 14px 14px;
    background-position: 0 0, 0 7px, 7px -7px, -7px 0;
    background-color: var(--gbr-checker-b);
}

.gbr-preview-placeholder {
    display: flex; flex-direction: column;
    align-items: center; gap: 0.5rem;
    color: var(--gbr-text-muted); font-size: 0.82rem;
}
.gbr-preview-placeholder svg,
.gbr-preview-placeholder i { width: 28px; height: 28px; opacity: 0.35; }

.gbr-preview-info {
    display: flex; gap: 1rem;
    font-size: 0.78rem; color: var(--gbr-text-muted);
}
.gbr-preview-info svg, .gbr-preview-info i { width: 12px; height: 12px; }
.gbr-preview-hint { font-size: 0.75rem; color: var(--gbr-text-muted); font-style: italic; }

/* ============================================
   SETTINGS PANEL
   ============================================ */
.gbr-settings-panel {
    padding: 2rem;
    border-bottom: 1px solid var(--gbr-border);
    transition: border-color var(--gbr-speed);
}

.gbr-panel-header { margin-bottom: 1.5rem; }
.gbr-panel-header h3 {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 1rem; font-weight: 700; color: var(--gbr-text); margin: 0;
}
.gbr-panel-header h3 svg,
.gbr-panel-header h3 i { color: var(--gbr-primary); width: 20px; height: 20px; }

.gbr-settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}
.gbr-settings-col {
    display: flex; flex-direction: column; gap: 1.5rem;
}

.gbr-section-label {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: 0.75rem; font-weight: 700;
    color: var(--gbr-text);
    text-transform: uppercase; letter-spacing: 0.06em;
    margin-bottom: 0.65rem;
}
.gbr-section-label svg,
.gbr-section-label i { color: var(--gbr-primary); width: 14px; height: 14px; }

/* ---- Color tabs ---- */
.gbr-color-tabs {
    display: flex; gap: 0; margin-bottom: 1rem;
    background: var(--gbr-bg-secondary); padding: 3px;
    border-radius: var(--gbr-radius-md);
    border: 1px solid var(--gbr-border);
}
.color-tab {
    flex: 1; display: flex; align-items: center; justify-content: center;
    gap: 0.4rem; padding: 0.5rem 0.75rem;
    border: none; border-radius: calc(var(--gbr-radius-md) - 3px);
    background: transparent; color: var(--gbr-text-muted);
    font-size: 0.85rem; font-weight: 500; cursor: pointer;
    transition: all 0.2s; white-space: nowrap;
}
.color-tab svg, .color-tab i { width: 15px; height: 15px; }
.color-tab.active {
    background: var(--gbr-bg-elevated); color: var(--gbr-primary);
    font-weight: 600; box-shadow: var(--gbr-shadow-sm);
}
.color-tab:hover:not(.active) { color: var(--gbr-text); background: var(--gbr-bg-tertiary); }

/* ---- Picker row ---- */
.gbr-picker-row {
    display: flex; align-items: center; gap: 0.75rem; margin-bottom: 1rem;
}
.gbr-picker-wrap {
    width: 48px; height: 48px;
    border-radius: var(--gbr-radius-md); overflow: hidden;
    border: 2px solid var(--gbr-border);
    cursor: pointer; flex-shrink: 0;
    transition: border-color 0.2s; box-shadow: var(--gbr-shadow-sm);
}
.gbr-picker-wrap:hover { border-color: var(--gbr-primary); box-shadow: 0 0 0 3px rgba(51,153,102,0.15); }
.gbr-picker-wrap input[type="color"] {
    width: 100%; height: 100%; border: none; padding: 0; cursor: pointer; transform: scale(1.2);
}
.gbr-hex-input {
    flex: 1; height: 48px; padding: 0 1rem;
    background: var(--gbr-input-bg);
    border: 1.5px solid var(--gbr-input-bdr);
    border-radius: var(--gbr-radius-md);
    color: var(--gbr-text); font-size: 0.95rem;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-weight: 600; letter-spacing: 0.06em; transition: all 0.2s;
}
.gbr-hex-input:focus {
    outline: none; border-color: var(--gbr-primary);
    box-shadow: 0 0 0 3px rgba(51,153,102,0.12);
}
.gbr-hex-input::placeholder { color: var(--gbr-text-muted); }

/* ---- Color presets ---- */
.gbr-presets { margin-top: 0.25rem; }
.gbr-presets-label {
    font-size: 0.72rem; font-weight: 700; color: var(--gbr-text-muted);
    text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.6rem;
}
.gbr-presets-grid { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.preset-color {
    width: 34px; height: 34px;
    border-radius: var(--gbr-radius-sm); cursor: pointer;
    border: 2px solid transparent; transition: all 0.18s;
    position: relative; flex-shrink: 0;
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1), var(--gbr-shadow-sm);
}
.preset-color:hover { transform: scale(1.15); box-shadow: inset 0 0 0 1px rgba(0,0,0,0.1), var(--gbr-shadow-md); }
.preset-color.active {
    border-color: var(--gbr-primary); transform: scale(1.1);
    box-shadow: 0 0 0 3px rgba(51,153,102,0.3);
}
.gbr-preset-label {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.58rem; font-weight: 800; color: white;
    text-shadow: 0 1px 3px rgba(0,0,0,0.6); pointer-events: none; letter-spacing: 0;
}

/* ---- Tolerance slider ---- */
.gbr-tolerance { margin-top: 0.25rem; }
.gbr-tolerance-label {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 0.65rem; font-size: 0.875rem; font-weight: 500; color: var(--gbr-text);
}
.gbr-tolerance-val {
    font-size: 0.9rem; font-weight: 700; color: var(--gbr-primary);
    background: var(--gbr-primary-light); padding: 0.1rem 0.6rem;
    border-radius: var(--gbr-radius-full); min-width: 3rem; text-align: center;
    transition: background var(--gbr-speed);
}
.gbr-slider {
    width: 100%; height: 6px;
    -webkit-appearance: none; appearance: none;
    background: var(--gbr-bg-tertiary); border-radius: var(--gbr-radius-full);
    outline: none; cursor: pointer;
}
.gbr-slider::-webkit-slider-thumb {
    -webkit-appearance: none; width: 20px; height: 20px;
    border-radius: 50%; background: var(--gbr-primary); cursor: pointer;
    box-shadow: 0 2px 6px rgba(51,153,102,0.4); border: 2.5px solid white; transition: all 0.2s;
}
.gbr-slider::-webkit-slider-thumb:hover { transform: scale(1.15); }
.gbr-slider::-moz-range-thumb {
    width: 20px; height: 20px; border-radius: 50%;
    background: var(--gbr-primary); border: 2.5px solid white;
    cursor: pointer; box-shadow: 0 2px 6px rgba(51,153,102,0.4);
}
.gbr-slider-scale {
    display: flex; justify-content: space-between; margin-top: 0.35rem;
    font-size: 0.7rem; color: var(--gbr-text-muted);
}

/* ---- Info box ---- */
.gbr-info-box {
    display: flex; align-items: flex-start; gap: 0.65rem;
    padding: 0.875rem 1rem;
    background: var(--gbr-primary-light);
    border-radius: var(--gbr-radius-md);
    border: 1px solid rgba(51,153,102,0.15);
    transition: background var(--gbr-speed);
}
.gbr-info-box svg, .gbr-info-box i {
    color: var(--gbr-primary); flex-shrink: 0; width: 16px; height: 16px; margin-top: 2px;
}
.gbr-info-box p { margin: 0; font-size: 0.84rem; color: var(--gbr-text-secondary); line-height: 1.6; }
.gbr-info-box p strong { color: var(--gbr-text); }
[data-theme="dark"] .gbr-info-box { border-color: rgba(74,222,128,0.15); }

/* ============================================
   REMOVAL METHOD SELECTOR
   Replaces the old chroma-key toggle
   ============================================ */
.gbr-method-section { display: flex; flex-direction: column; gap: 0.65rem; }

.gbr-method-options { display: flex; flex-direction: column; gap: 0.5rem; }

.gbr-method-opt {
    display: flex; align-items: flex-start; gap: 0.85rem;
    padding: 0.9rem 1rem;
    border: 1.5px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md);
    cursor: pointer; transition: all 0.2s;
    background: var(--gbr-bg-secondary);
}
.gbr-method-opt:hover { border-color: var(--gbr-primary); background: var(--gbr-primary-light); }
.gbr-method-opt:has(input:checked) {
    border-color: var(--gbr-primary); background: var(--gbr-primary-light);
}
.gbr-method-opt input { display: none; }

.gbr-method-dot {
    width: 18px; height: 18px; border-radius: 50%;
    border: 2px solid var(--gbr-border-light); background: var(--gbr-bg-elevated);
    flex-shrink: 0; transition: all 0.2s; position: relative; margin-top: 2px;
}
.gbr-method-opt:has(input:checked) .gbr-method-dot {
    border-color: var(--gbr-primary); background: var(--gbr-primary);
    box-shadow: 0 0 0 3px rgba(51,153,102,0.2);
}
.gbr-method-opt:has(input:checked) .gbr-method-dot::after {
    content: ''; position: absolute; top: 50%; left: 50%;
    transform: translate(-50%,-50%); width: 6px; height: 6px;
    background: white; border-radius: 50%;
}
.gbr-method-info { display: flex; flex-direction: column; gap: 0.15rem; flex: 1; }
.gbr-method-name {
    display: flex; align-items: center; gap: 0.45rem;
    font-size: 0.9rem; font-weight: 600; color: var(--gbr-text);
}
.gbr-method-name .gbr-method-badge {
    font-size: 0.65rem; font-weight: 700; padding: 0.1rem 0.5rem;
    border-radius: var(--gbr-radius-full); background: var(--gbr-primary);
    color: white; text-transform: uppercase; letter-spacing: 0.04em;
}
.gbr-method-desc { font-size: 0.77rem; color: var(--gbr-text-muted); line-height: 1.45; }

/* ---- Spill reduction (chroma only) ---- */
.gbr-field-hint {
    font-size: 0.75rem; color: var(--gbr-text-muted);
    line-height: 1.5; margin: 0.55rem 0 0; max-width: 800px;
}
.gbr-bg-tabs {
    display: flex; gap: 0.4rem; margin-bottom: 0.6rem; flex-wrap: wrap;
}
.gbr-bg-tab {
    display: inline-flex; align-items: center; gap: 0.35rem;
    padding: 0.5rem 0.8rem;
    background: var(--gbr-bg-elevated);
    border: 1.5px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md);
    font-size: 0.8rem; font-weight: 600; color: var(--gbr-text-secondary);
    cursor: pointer;
    transition: border-color var(--gbr-speed), color var(--gbr-speed), background var(--gbr-speed);
}
.gbr-bg-tab svg, .gbr-bg-tab i { color: var(--gbr-text-muted); }
.gbr-bg-tab:hover { border-color: var(--gbr-primary); }
.gbr-bg-tab.active {
    border-color: var(--gbr-primary);
    background: var(--gbr-primary-light);
    color: var(--gbr-primary-dark);
}
.gbr-bg-tab.active svg, .gbr-bg-tab.active i { color: var(--gbr-primary); }
.gbr-bg-panel { margin-bottom: 0.4rem; }
.gbr-bg-upload {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 0.9rem;
    background: var(--gbr-bg-secondary);
    border: 1.5px dashed var(--gbr-border);
    border-radius: var(--gbr-radius-md);
    font-size: 0.8rem; color: var(--gbr-text-secondary);
    cursor: pointer;
    transition: border-color var(--gbr-speed);
}
.gbr-bg-upload:hover { border-color: var(--gbr-primary); }
.gbr-bg-upload svg, .gbr-bg-upload i { color: var(--gbr-primary); flex-shrink: 0; }

/* ---- Manual eraser editor ---- */
.gbr-eraser {
    margin: 1.25rem auto 0; max-width: 560px;
    display: flex; flex-direction: column; gap: 0.75rem;
}
.gbr-eraser-head { display: flex; }
.gbr-eraser-stage {
    border: 1px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md);
    overflow: hidden;
    display: flex; align-items: center; justify-content: center;
    max-height: 460px;
}
.gbr-eraser-stage canvas {
    max-width: 100%; height: auto; display: block;
    cursor: crosshair; touch-action: none;
}
.gbr-eraser-controls {
    display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap;
    justify-content: center;
}
.gbr-eraser-brush {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.8rem; font-weight: 600; color: var(--gbr-text-secondary);
}
.gbr-eraser-brush .gbr-slider { width: 120px; }
.gbr-btn-sm {
    padding: 0.5rem 0.85rem; font-size: 0.82rem;
}

.gbr-recipes {
    margin: 0 2rem 1.25rem;
    padding: 1rem 1.1rem;
    background: var(--gbr-bg-secondary);
    border: 1px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md);
}
.gbr-recipes-label {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: 0.8rem; font-weight: 700; color: var(--gbr-text-secondary);
    text-transform: uppercase; letter-spacing: 0.03em;
    margin-bottom: 0.75rem;
}
.gbr-recipes-label svg, .gbr-recipes-label i { color: var(--gbr-primary); }
.gbr-recipes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.6rem;
}
.gbr-recipe {
    display: flex; flex-direction: column; align-items: center; gap: 0.3rem;
    padding: 0.85rem 0.6rem;
    background: var(--gbr-bg-elevated);
    border: 1.5px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md);
    cursor: pointer;
    text-align: center;
    transition: border-color var(--gbr-speed), background var(--gbr-speed), transform var(--gbr-speed);
}
.gbr-recipe:hover { border-color: var(--gbr-primary); transform: translateY(-1px); }
.gbr-recipe svg, .gbr-recipe i { color: var(--gbr-primary); }
.gbr-recipe-name { font-size: 0.84rem; font-weight: 600; color: var(--gbr-text); }
.gbr-recipe-meta { font-size: 0.72rem; color: var(--gbr-text-muted); }
.gbr-recipe.active {
    border-color: var(--gbr-primary);
    background: var(--gbr-primary-light);
}
.gbr-recipe.active .gbr-recipe-name { color: var(--gbr-primary-dark); }
.gbr-recipe:focus-visible { outline: 2px solid var(--gbr-primary); outline-offset: 2px; }
@media (max-width: 768px) {
    .gbr-recipes { margin: 0 1rem 1.25rem; }
}

.gbr-advanced {
    margin: 1.25rem 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
.gbr-advanced .gbr-section-label { margin-bottom: 0.1rem; }
@media (max-width: 768px) {
    .gbr-advanced { margin: 1.25rem 1rem 0; }
}
.gbr-toggle-row {
    display: flex; align-items: center; justify-content: space-between; gap: 1rem;
    padding: 0.9rem 1rem;
    background: var(--gbr-bg-secondary);
    border-radius: var(--gbr-radius-md);
    border: 1.5px solid var(--gbr-border);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}
.gbr-toggle-row:has(input:checked) { border-color: var(--gbr-primary); background: var(--gbr-primary-light); }
.gbr-toggle-info { display: flex; flex-direction: column; gap: 0.15rem; }
.gbr-toggle-label { font-size: 0.9rem; font-weight: 600; color: var(--gbr-text); }
.gbr-toggle-desc  { font-size: 0.77rem; color: var(--gbr-text-muted); }

.gbr-toggle { position: relative; display: inline-flex; flex-shrink: 0; }
.gbr-toggle input { opacity: 0; width: 0; height: 0; position: absolute; }
.gbr-toggle-slider {
    display: block; width: 44px; height: 24px;
    background: var(--gbr-bg-tertiary); border-radius: var(--gbr-radius-full);
    cursor: pointer; transition: background 0.2s; position: relative;
}
.gbr-toggle-slider::after {
    content: ''; position: absolute; top: 3px; left: 3px;
    width: 18px; height: 18px; border-radius: 50%;
    background: white; box-shadow: 0 1px 3px rgba(0,0,0,0.2); transition: transform 0.2s;
}
.gbr-toggle input:checked + .gbr-toggle-slider { background: var(--gbr-primary); }
.gbr-toggle input:checked + .gbr-toggle-slider::after { transform: translateX(20px); }
.gbr-toggle input:focus-visible + .gbr-toggle-slider { outline: 2px solid var(--gbr-primary); outline-offset: 2px; }

/* ---- Output format ---- */
.gbr-output-section { display: flex; flex-direction: column; gap: 0; }
.gbr-output-options { display: flex; flex-direction: column; gap: 0.5rem; }

.gbr-radio-opt {
    display: flex; align-items: center; gap: 0.85rem;
    padding: 0.85rem 1rem; border: 1.5px solid var(--gbr-border);
    border-radius: var(--gbr-radius-md); cursor: pointer;
    transition: all 0.2s; background: var(--gbr-bg-secondary);
}
.gbr-radio-opt:hover { border-color: var(--gbr-primary); background: var(--gbr-primary-light); }
.gbr-radio-opt:has(input:checked) { border-color: var(--gbr-primary); background: var(--gbr-primary-light); }
.gbr-radio-opt input { display: none; }
.gbr-radio-dot {
    width: 18px; height: 18px; border-radius: 50%;
    border: 2px solid var(--gbr-border-light); background: var(--gbr-bg-elevated);
    flex-shrink: 0; transition: all 0.2s; position: relative;
}
.gbr-radio-opt:has(input:checked) .gbr-radio-dot {
    border-color: var(--gbr-primary); background: var(--gbr-primary);
    box-shadow: 0 0 0 3px rgba(51,153,102,0.2);
}
.gbr-radio-opt:has(input:checked) .gbr-radio-dot::after {
    content: ''; position: absolute; top: 50%; left: 50%;
    transform: translate(-50%,-50%); width: 6px; height: 6px;
    background: white; border-radius: 50%;
}
.gbr-radio-label { display: flex; flex-direction: column; gap: 0.1rem; }
.gbr-radio-label strong { font-size: 0.9rem; color: var(--gbr-text); font-weight: 600; }
.gbr-radio-label small  { font-size: 0.78rem; color: var(--gbr-text-muted); }

/* ============================================
   BUTTONS
   ============================================ */
.gbr-btn {
    display: inline-flex; align-items: center; justify-content: center;
    gap: 0.5rem; padding: 0.75rem 1.5rem;
    border: none; border-radius: var(--gbr-radius-md);
    font-size: 0.95rem; font-weight: 600; cursor: pointer;
    transition: all 0.2s; text-decoration: none; white-space: nowrap;
}
.gbr-btn svg, .gbr-btn i { width: 18px; height: 18px; flex-shrink: 0; }

.gbr-btn-primary {
    background: var(--gbr-primary); color: white; box-shadow: var(--gbr-shadow-p);
}
.gbr-btn-primary:hover {
    background: var(--gbr-primary-dark); box-shadow: var(--gbr-shadow-ph); transform: translateY(-1px);
}
.gbr-btn-success {
    background: var(--gbr-success); color: white; box-shadow: var(--gbr-shadow-p);
}
.gbr-btn-success:hover {
    background: var(--gbr-primary-dark); box-shadow: var(--gbr-shadow-ph); transform: translateY(-1px);
}
.gbr-btn-secondary {
    background: var(--gbr-bg-secondary); color: var(--gbr-text); border: 1.5px solid var(--gbr-border);
}
.gbr-btn-secondary:hover {
    background: var(--gbr-bg-tertiary); border-color: var(--gbr-primary); color: var(--gbr-primary);
}
.gbr-btn-ghost {
    background: transparent; color: var(--gbr-text-muted);
    border: 1px solid rgba(255,255,255,0.15); font-size: 0.82rem; padding: 0.5rem 1rem;
}
.gbr-btn-ghost:hover { background: rgba(255,255,255,0.1); color: white; border-color: rgba(255,255,255,0.3); }

/* ---- Action bar ---- */
.gbr-action-bar {
    display: flex; align-items: center; justify-content: flex-end; gap: 1rem;
    padding: 1.25rem 2rem;
    background: var(--gbr-bg-secondary);
    border-top: 1px solid var(--gbr-border);
    border-radius: 0 0 var(--gbr-radius-lg) var(--gbr-radius-lg);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}

/* ============================================
   PROCESSING OVERLAY
   ============================================ */
.gbr-processing-overlay {
    position: fixed; inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: none; align-items: center; justify-content: center;
    z-index: 9000;
}

.gbr-processing-box {
    background: var(--gbr-bg-elevated);
    border-radius: var(--gbr-radius-lg);
    padding: 2rem 2.25rem;
    text-align: center;
    min-width: 340px; max-width: 440px; width: 90%;
    box-shadow: var(--gbr-shadow-xl);
    border: 1px solid var(--gbr-border);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}

.gbr-processing-title {
    font-size: 1.1rem; font-weight: 700; color: var(--gbr-text);
    margin: 0 0 1.5rem; transition: color 0.3s;
}

/* ---- Staged progress dots ---- */
.gbr-stages {
    display: flex; align-items: center; justify-content: center;
    gap: 0; margin-bottom: 1.5rem;
}
.gbr-stage {
    display: flex; flex-direction: column; align-items: center; gap: 0.4rem;
    flex-shrink: 0;
}
.gbr-stage-dot {
    display: flex; align-items: center; justify-content: center;
    width: 20px; height: 20px; padding: 6px;
    background: var(--gbr-bg-secondary);
    color: var(--gbr-text-muted);
    border-radius: 50%;
    transition: background var(--gbr-speed), color var(--gbr-speed), transform var(--gbr-speed);
}
.gbr-stage-label {
    font-size: 0.7rem; font-weight: 600; color: var(--gbr-text-muted);
    transition: color var(--gbr-speed);
}
.gbr-stage-conn {
    width: 28px; height: 2px; background: var(--gbr-bg-tertiary);
    margin: 0 4px; align-self: flex-start; margin-top: 16px;
    transition: background var(--gbr-speed);
}
.gbr-stage.active .gbr-stage-dot {
    background: var(--gbr-primary); color: #fff; transform: scale(1.08);
}
.gbr-stage.active .gbr-stage-label { color: var(--gbr-primary); }
.gbr-stage.done .gbr-stage-dot {
    background: var(--gbr-success); color: #fff;
}
.gbr-stage.done .gbr-stage-label { color: var(--gbr-success); }
.gbr-stage.done + .gbr-stage-conn { background: var(--gbr-success); }

.gbr-progress-track {
    height: 8px; background: var(--gbr-bg-secondary);
    border-radius: var(--gbr-radius-full); overflow: hidden; margin-bottom: 0.6rem;
}
.gbr-progress-bar {
    height: 100%; background: var(--gbr-primary);
    border-radius: var(--gbr-radius-full); transition: width 0.4s ease; width: 0;
}
.gbr-progress-row {
    display: flex; align-items: baseline; justify-content: center; gap: 0.5rem;
    margin-bottom: 1rem; flex-wrap: wrap;
}
.gbr-progress-text {
    font-size: 0.9rem; font-weight: 700; color: var(--gbr-primary);
}
.gbr-processing-status {
    font-size: 0.84rem; color: var(--gbr-text-muted);
    margin: 0; min-height: 1.3em; transition: color 0.3s;
}
.gbr-processing-cancel {
    margin-top: 0.25rem;
}
@media (max-width: 480px) {
    .gbr-processing-box { min-width: 0; padding: 1.75rem 1.25rem; }
    .gbr-stage-conn { width: 16px; }
    .gbr-stage-label { font-size: 0.65rem; }
}

/* ============================================
   RESULTS SECTION
   ============================================ */
.gbr-results-section { animation: gbr-fadein 0.4s ease; }

.gbr-results-header {
    display: flex; flex-direction: column; align-items: center;
    padding: 2.5rem 2rem 2rem;
    background: var(--gbr-primary-light);
    border-bottom: 1px solid var(--gbr-border);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}
.gbr-results-icon {
    width: 60px; height: 60px; background: var(--gbr-primary);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    color: white; margin-bottom: 0.875rem; box-shadow: var(--gbr-shadow-p);
}
.gbr-results-icon svg, .gbr-results-icon i { width: 28px; height: 28px; }
.gbr-results-title {
    font-size: 1.5rem; font-weight: 700; color: var(--gbr-text); margin: 0;
}

.gbr-results-stats {
    display: flex; align-items: center; justify-content: center; gap: 2.5rem;
    padding: 1.5rem 2rem; border-bottom: 1px solid var(--gbr-border);
    transition: border-color var(--gbr-speed);
}
.gbr-stat { text-align: center; }
.gbr-stat-label {
    font-size: 0.72rem; font-weight: 700; color: var(--gbr-text-muted);
    text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.3rem;
}
.gbr-stat-value { font-size: 1.4rem; font-weight: 700; color: var(--gbr-text); }
.gbr-stat-arrow { color: var(--gbr-primary); }

.gbr-pp-notice {
    display: flex; align-items: flex-start; gap: 0.75rem;
    padding: 0.9rem 2rem; background: var(--gbr-primary-light);
    border-bottom: 1px solid var(--gbr-border);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}
.gbr-pp-notice svg, .gbr-pp-notice i {
    color: var(--gbr-primary); flex-shrink: 0; width: 18px; height: 18px; margin-top: 1px;
}
.gbr-pp-notice div   { display: flex; flex-direction: column; gap: 0.15rem; }
.gbr-pp-notice strong { font-size: 0.875rem; font-weight: 600; color: var(--gbr-text); }
.gbr-pp-notice span   { font-size: 0.8rem; color: var(--gbr-text-secondary); }

.gbr-result-preview {
    display: flex; justify-content: center; padding: 2rem 2rem 1.5rem;
}
.gbr-result-img-wrap {
    max-width: 440px; width: 100%;
    border-radius: var(--gbr-radius-lg); overflow: hidden;
    background-image:
        linear-gradient(45deg, var(--gbr-checker-a) 25%, transparent 25%),
        linear-gradient(-45deg, var(--gbr-checker-a) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--gbr-checker-a) 75%),
        linear-gradient(-45deg, transparent 75%, var(--gbr-checker-a) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-color: var(--gbr-checker-b);
    border: 1px solid var(--gbr-border); box-shadow: var(--gbr-shadow-md);
}
.gbr-result-img-wrap img { max-width: 100%; display: block; }

.gbr-result-actions {
    display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap;
    padding: 0 2rem 2rem;
}

/* ============================================
   INFO SECTION
   ============================================ */
.gbr-info-section { margin-top: 3rem; }
.gbr-info-card {
    background: var(--gbr-bg-elevated);
    border-radius: var(--gbr-radius-lg);
    box-shadow: none; border: 1px solid var(--gbr-border);
    padding: 2rem; margin-bottom: 1.5rem;
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}
.gbr-info-card h2 {
    display: flex; align-items: center; gap: 0.75rem;
    font-size: 1.25rem; font-weight: 700; color: var(--gbr-text); margin: 0 0 1.25rem;
}
.gbr-info-card h2 svg, .gbr-info-card h2 i { color: var(--gbr-primary); flex-shrink: 0; }
.gbr-info-card p { color: var(--gbr-text-secondary); line-height: 1.75; margin: 0 0 1rem; }
.gbr-info-card p:last-child { margin-bottom: 0; }
.gbr-info-card p a { color: var(--gbr-primary); text-decoration: none; font-weight: 500; }
.gbr-info-card p a:hover { text-decoration: underline; }

/* ---- Use cases grid ---- */
.gbr-use-cases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.gbr-use-case {
    display: flex; gap: 1rem; padding: 1.25rem;
    background: var(--gbr-bg-secondary);
    border-radius: var(--gbr-radius-md);
    border: 1px solid var(--gbr-border-light); transition: all 0.2s;
}
.gbr-use-case:hover { border-color: var(--gbr-border); }
.gbr-use-case-icon {
    flex-shrink: 0; width: 44px; height: 44px;
    background: var(--gbr-primary-light); border-radius: var(--gbr-radius-md);
    display: flex; align-items: center; justify-content: center;
    color: var(--gbr-primary); transition: background var(--gbr-speed);
}
.gbr-use-case h4 { margin: 0 0 0.35rem; font-size: 0.95rem; font-weight: 600; color: var(--gbr-text); }
.gbr-use-case p  { margin: 0; font-size: 0.875rem; color: var(--gbr-text-secondary); line-height: 1.5; }
.gbr-use-case p a { color: var(--gbr-primary); text-decoration: none; }
.gbr-use-case p a:hover { text-decoration: underline; }

/* ---- Related tools ---- */
.gbr-related-tools { display: flex; flex-wrap: wrap; gap: 0.65rem; }
.gbr-related-tool {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.55rem 1.1rem; background: var(--gbr-bg-secondary);
    border: 1.5px solid var(--gbr-border); border-radius: var(--gbr-radius-full);
    color: var(--gbr-text-secondary); text-decoration: none;
    font-size: 0.875rem; font-weight: 500; transition: all 0.2s;
}
.gbr-related-tool:hover {
    background: var(--gbr-primary-light); border-color: var(--gbr-primary); color: var(--gbr-primary);
}
.gbr-related-tool svg, .gbr-related-tool i { width: 15px; height: 15px; }

/* ---- FAQ ---- */
.gbr-info-card .faq-list { display: flex; flex-direction: column; gap: 0.65rem; }
.gbr-info-card .faq-item {
    border: 1px solid var(--gbr-border); border-radius: var(--gbr-radius-md);
    overflow: hidden; transition: border-color var(--gbr-speed);
}
.gbr-info-card .faq-item:hover { border-color: var(--gbr-primary); }
.gbr-info-card .faq-question {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    gap: 1rem; padding: 1rem 1.25rem; background: var(--gbr-bg-secondary);
    border: none; cursor: pointer; font-size: 0.95rem; font-weight: 600;
    color: var(--gbr-text); text-align: left; transition: background 0.2s, color 0.2s;
}
.gbr-info-card .faq-question:hover { background: var(--gbr-bg-tertiary); }
.gbr-info-card .faq-question svg,
.gbr-info-card .faq-question i {
    flex-shrink: 0; color: var(--gbr-primary); width: 18px; height: 18px; transition: transform 0.3s;
}
.gbr-info-card .faq-item.open .faq-question { color: var(--gbr-primary); background: var(--gbr-primary-light); }
.gbr-info-card .faq-item.open .faq-question svg,
.gbr-info-card .faq-item.open .faq-question i { transform: rotate(180deg); }
.gbr-info-card .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.gbr-info-card .faq-item.open .faq-answer { max-height: 400px; }
.gbr-info-card .faq-answer p {
    padding: 1rem 1.25rem; margin: 0;
    color: var(--gbr-text-secondary); line-height: 1.75; font-size: 0.9rem;
    border-top: 1px solid var(--gbr-border); background: var(--gbr-bg-elevated);
    transition: background var(--gbr-speed), border-color var(--gbr-speed);
}
.gbr-info-card .faq-answer a { color: var(--gbr-primary); text-decoration: none; }
.gbr-info-card .faq-answer a:hover { text-decoration: underline; }

/* ============================================
   NOTIFICATION TOAST
   ============================================ */
.gbr-notification {
    position: fixed; bottom: 24px; left: 50%;
    transform: translateX(-50%);
    background: var(--gbr-text); color: var(--gbr-bg-elevated);
    padding: 0.75rem 1.5rem; border-radius: var(--gbr-radius-full);
    font-size: 0.875rem; font-weight: 500; z-index: 1001;
    box-shadow: var(--gbr-shadow-lg); animation: gbr-fadein 0.3s ease;
    transition: opacity 0.3s; white-space: nowrap;
}

/* ============================================
   ANIMATIONS
   ============================================ */
.gbr-editor-section,
.gbr-results-section { animation: gbr-fadein 0.4s ease; }
@keyframes gbr-fadein {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
    .gbr-settings-grid { grid-template-columns: 1fr; }
    .gbr-use-cases     { grid-template-columns: 1fr; }
    .gbr-preview-area  { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .tool-container { padding: 1rem; }
    .gbr-title-row  { gap: 0.75rem; }
    .gbr-icon-wrap  { width: 50px; height: 50px; }
    .gbr-icon-wrap svg, .gbr-icon-wrap i { width: 22px; height: 22px; }
    .gbr-upload-section { padding: 2rem 1.5rem; }
    .gbr-upload-area    { padding: 2.5rem 1.5rem; }
    .gbr-preview-area   { padding: 1.25rem 1.5rem; gap: 1.25rem; }
    .gbr-settings-panel { padding: 1.5rem; }
    .gbr-error-display  { margin: 0 1rem 1rem; }
    .gbr-info-card      { padding: 1.5rem; }
    .gbr-action-bar     { flex-direction: column; padding: 1.25rem; }
    .gbr-btn            { width: 100%; justify-content: center; }
    .gbr-results-header { padding: 1.75rem 1.5rem 1.5rem; }
    .gbr-results-stats  { flex-direction: column; gap: 1rem; }
    .gbr-stat-arrow     { transform: rotate(90deg); }
    .gbr-result-preview { padding: 1.5rem; }
    .gbr-result-actions { flex-direction: column; padding: 0 1.25rem 1.5rem; }
    .gbr-use-case       { flex-direction: column; gap: 0.75rem; }
    .gbr-related-tools  { flex-direction: row; flex-wrap: wrap; }
    .gbr-color-tabs     { flex-direction: row; }
    .gbr-pp-warning     { margin: 0 1rem 0; }
}

@media (max-width: 480px) {
    .gbr-title-row    { flex-direction: column; gap: 0.75rem; }
    .gbr-presets-grid { gap: 0.4rem; }
    .preset-color     { width: 30px; height: 30px; }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   SCROLLBARS
   ============================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--gbr-bg); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--gbr-text-muted); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--gbr-text-secondary); }

::selection { background: rgba(51,153,102,0.2); color: var(--gbr-text); }
[data-theme="dark"] ::selection { background: rgba(74,222,128,0.3); }