/* ============================================
   Compress PNG - tools.suritdevelopers.com
   Prefix: cpng-   |   Primary: #339966 (green)
   Dark mode: [data-theme="dark"]
   ============================================ */

/* --- Light Mode (Default) --- */
:root {
    --cpng-transition: 0.25s;

    /* Brand */
    --cpng-primary:       #339966;
    --cpng-primary-light: rgba(51, 153, 102, 0.12);
    --cpng-primary-dark:  #267a52;
    --cpng-accent:        #3399cc;

    /* Status */
    --cpng-success:       #339966;
    --cpng-success-light: rgba(51, 153, 102, 0.12);
    --cpng-warning:       #d97706;
    --cpng-warning-light: rgba(217, 119, 6, 0.10);
    --cpng-danger:        #e64e4e;
    --cpng-danger-light:  rgba(230, 78, 78, 0.10);

    /* Backgrounds */
    --cpng-bg:           #f0faf5;
    --cpng-bg-elevated:  #ffffff;
    --cpng-bg-secondary: #f4f7f5;
    --cpng-bg-tertiary:  #e8f0eb;

    /* Text */
    --cpng-text:           #1e293b;
    --cpng-text-secondary: #475569;
    --cpng-text-muted:     #64748b;

    /* Borders */
    --cpng-border:       #c8ddd3;
    --cpng-border-light: #dde9e4;

    /* Shadows */
    --cpng-shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
    --cpng-shadow-md:  0 4px 6px -1px rgba(0,0,0,0.10);
    --cpng-shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.10);
    --cpng-shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.10);
    --cpng-shadow-primary:       0 4px 14px rgba(51, 153, 102, 0.25);
    --cpng-shadow-primary-hover: 0 6px 20px rgba(51, 153, 102, 0.35);

    /* Input */
    --cpng-input-bg:     #ffffff;
    --cpng-input-border: #c8ddd3;

    /* Radius */
    --cpng-radius-sm:   6px;
    --cpng-radius-md:   12px;
    --cpng-radius-lg:   16px;
    --cpng-radius-xl:   24px;
    --cpng-radius-full: 9999px;

    /* Scrollbar */
    --cpng-scroll-track: var(--cpng-bg);
    --cpng-scroll-thumb: var(--cpng-text-muted);
}

/* --- Dark Mode --- */
[data-theme="dark"] {
    --cpng-primary:       #4ade80;
    --cpng-primary-light: rgba(74, 222, 128, 0.15);
    --cpng-primary-dark:  #22c55e;
    --cpng-accent:        #60a5fa;

    --cpng-success:       #4ade80;
    --cpng-success-light: rgba(74, 222, 128, 0.15);
    --cpng-warning:       #fbbf24;
    --cpng-warning-light: rgba(251, 191, 36, 0.15);
    --cpng-danger:        #f87171;
    --cpng-danger-light:  rgba(248, 113, 113, 0.15);

    --cpng-bg:           #0d1f17;
    --cpng-bg-elevated:  #1a2e22;
    --cpng-bg-secondary: #243829;
    --cpng-bg-tertiary:  #2e4535;

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

    --cpng-border:       #2e4535;
    --cpng-border-light: #3a5442;

    --cpng-shadow-sm:  0 1px 3px rgba(0,0,0,0.30);
    --cpng-shadow-md:  0 4px 6px -1px rgba(0,0,0,0.40);
    --cpng-shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.40);
    --cpng-shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.50);
    --cpng-shadow-primary:       0 4px 14px rgba(74, 222, 128, 0.20);
    --cpng-shadow-primary-hover: 0 6px 20px rgba(74, 222, 128, 0.30);

    --cpng-input-bg:     #243829;
    --cpng-input-border: #3a5442;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--cpng-bg);
    color: var(--cpng-text);
    line-height: 1.6;
    transition: background-color var(--cpng-transition), color var(--cpng-transition);
}

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

.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

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

.tool-icon-wrapper {
    width: 64px;
    height: 64px;
    background: var(--cpng-primary);
    border-radius: var(--cpng-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--cpng-shadow-primary);
    flex-shrink: 0;
    transition: background-color var(--cpng-transition), box-shadow var(--cpng-transition);
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i { width: 28px; height: 28px; }

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--cpng-primary);
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--cpng-text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.tool-description a {
    color: var(--cpng-primary);
    text-decoration: none;
    font-weight: 500;
}

.tool-description a:hover { text-decoration: underline; }

/* ============================================
   Main Card
   ============================================ */
.tool-main {
    background: var(--cpng-bg-elevated);
    border-radius: var(--cpng-radius-xl);
    box-shadow: var(--cpng-shadow-xl);
    overflow: visible;
    border: 1px solid var(--cpng-border);
    margin-bottom: 2rem;
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

/* ============================================
   Upload Section
   ============================================ */
.upload-section { padding: 2.5rem; }

.upload-area {
    border: 2px dashed var(--cpng-border);
    border-radius: var(--cpng-radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--cpng-bg-secondary);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--cpng-primary-light);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--cpng-primary);
    background: var(--cpng-bg);
    transform: translateY(-2px);
    box-shadow: var(--cpng-shadow-md);
}

.upload-area:hover::before,
.upload-area.dragover::before { opacity: 0.5; }

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

.upload-icon {
    color: var(--cpng-primary);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon { transform: translateY(-5px); }

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

.upload-subtitle {
    color: var(--cpng-text-secondary);
    margin: 0 0 1rem;
    font-size: 1rem;
}

.file-types {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.file-type-badge {
    background: var(--cpng-primary-light);
    color: var(--cpng-primary);
    padding: 0.35rem 0.85rem;
    border-radius: var(--cpng-radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    transition: background-color var(--cpng-transition);
}

.upload-hint {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--cpng-text-muted);
    font-size: 0.875rem;
}

/* ============================================
   Editor Section
   ============================================ */
.editor-section {
    background: var(--cpng-bg-elevated);
    transition: background-color var(--cpng-transition);
}

.files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--cpng-bg-secondary);
    border-bottom: 1px solid var(--cpng-border);
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

.files-header-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--cpng-text);
}

.files-header-left svg,
.files-header-left i { color: var(--cpng-primary); }

.btn-text {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: none;
    border: none;
    color: var(--cpng-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: var(--cpng-radius-md);
    transition: all 0.2s ease;
}

.btn-text:hover { background: var(--cpng-primary-light); }

/* ============================================
   Files Grid
   ============================================ */
.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
    padding: 1.5rem 2rem;
    max-height: 320px;
    overflow-y: auto;
    border-bottom: 1px solid var(--cpng-border);
    transition: border-color var(--cpng-transition);
}

.file-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background: var(--cpng-bg-secondary);
    border: 1px solid var(--cpng-border);
    border-radius: var(--cpng-radius-md);
    transition: all 0.2s ease;
    position: relative;
}

.file-item:hover {
    border-color: var(--cpng-primary);
    background: var(--cpng-bg);
    transform: translateY(-2px);
    box-shadow: var(--cpng-shadow-md);
}

.file-preview {
    width: 80px;
    height: 80px;
    border-radius: var(--cpng-radius-md);
    background: var(--cpng-bg-tertiary);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--cpng-border);
    margin-bottom: 0.75rem;
    transition: border-color var(--cpng-transition);
}

.file-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.file-info {
    text-align: center;
    width: 100%;
    min-width: 0;
}

.file-name {
    font-weight: 600;
    color: var(--cpng-text);
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.file-meta {
    font-size: 0.75rem;
    color: var(--cpng-text-muted);
}

.file-remove {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 24px;
    height: 24px;
    border: none;
    border-radius: var(--cpng-radius-full);
    background: var(--cpng-danger-light);
    color: var(--cpng-danger);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    opacity: 0;
    transform: scale(0.8);
}

.file-item:hover .file-remove { opacity: 1; transform: scale(1); }
.file-remove:hover { background: var(--cpng-danger); color: white; }

/* ============================================
   Settings Panel
   ============================================ */
.settings-panel { padding: 2rem; }

.panel-header { margin-bottom: 1.5rem; }

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--cpng-text);
    margin: 0;
}

.panel-header h3 svg,
.panel-header h3 i { color: var(--cpng-primary); }

.section-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--cpng-text);
    margin-bottom: 0.75rem;
}

.section-label svg,
.section-label i { color: var(--cpng-primary); width: 16px; height: 16px; }

/* ============================================
   Compression Presets
   ============================================ */
.compression-presets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.75rem;
}

.compression-preset {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 1rem 0.75rem;
    border: 2px solid var(--cpng-border);
    border-radius: var(--cpng-radius-md);
    background: var(--cpng-bg-elevated);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.compression-preset svg,
.compression-preset i { color: var(--cpng-text-muted); transition: color 0.2s ease; }

.compression-preset .preset-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--cpng-text);
}

.compression-preset .preset-desc {
    font-size: 0.72rem;
    color: var(--cpng-text-muted);
}

.compression-preset:hover { border-color: var(--cpng-primary); }

.compression-preset.active {
    border-color: var(--cpng-primary);
    background: var(--cpng-primary-light);
}

.compression-preset.active svg,
.compression-preset.active i { color: var(--cpng-primary); }

/* ============================================
   Settings Grid (mode + quality)
   ============================================ */
.cpng-settings-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

/* Mode tabs */
.cpng-mode-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.cpng-mode-tabs {
    display: flex;
    gap: 0.5rem;
}

.cpng-mode-tab {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.7rem 1rem;
    border: 2px solid var(--cpng-border);
    border-radius: var(--cpng-radius-md);
    background: var(--cpng-bg-elevated);
    color: var(--cpng-text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.cpng-mode-tab:hover { border-color: var(--cpng-primary); color: var(--cpng-primary); }

.cpng-mode-tab.active {
    border-color: var(--cpng-primary);
    background: var(--cpng-primary);
    color: #fff;
}

.cpng-mode-hint {
    font-size: 0.7rem;
    font-weight: 400;
    opacity: 0.75;
}

/* Quality slider */
.cpng-quality-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quality-control-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.quality-slider {
    flex: 1;
    -webkit-appearance: none;
    height: 8px;
    border-radius: var(--cpng-radius-full);
    background: linear-gradient(to right, var(--cpng-warning), var(--cpng-success));
    outline: none;
    cursor: pointer;
}

.quality-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--cpng-bg-elevated);
    border: 3px solid var(--cpng-primary);
    cursor: pointer;
    box-shadow: var(--cpng-shadow-md);
    transition: transform 0.15s ease;
}

.quality-slider::-webkit-slider-thumb:hover { transform: scale(1.15); }

.quality-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--cpng-bg-elevated);
    border: 3px solid var(--cpng-primary);
    cursor: pointer;
    box-shadow: var(--cpng-shadow-md);
    border: none;
}

.cpng-quality-badge {
    min-width: 60px;
    padding: 0.5rem 0.75rem;
    background: var(--cpng-primary);
    color: white;
    border-radius: var(--cpng-radius-md);
    font-weight: 700;
    text-align: center;
    font-size: 0.9rem;
    white-space: nowrap;
}

.quality-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--cpng-text-muted);
}

/* ============================================
   Compression Info tip
   ============================================ */
.compression-info {
    display: flex;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--cpng-primary-light);
    border-radius: var(--cpng-radius-md);
    margin-top: 0.5rem;
    transition: background-color var(--cpng-transition);
}

.compression-info .info-icon { color: var(--cpng-primary); flex-shrink: 0; }

.compression-info .info-text {
    font-size: 0.9rem;
    color: var(--cpng-text-secondary);
    line-height: 1.5;
}

.compression-info .info-text a {
    color: var(--cpng-primary);
    text-decoration: none;
    font-weight: 500;
}

.compression-info .info-text a:hover { text-decoration: underline; }

/* ============================================
   Action Bar
   ============================================ */
.action-bar {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--cpng-border);
    background: var(--cpng-bg-secondary);
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--cpng-radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    border: none;
}

.btn svg, .btn i { width: 18px; height: 18px; }

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

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

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

.btn-secondary:hover {
    background: var(--cpng-bg);
    border-color: var(--cpng-text-muted);
}

/* ============================================
   Processing Overlay
   ============================================ */
.processing-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.processing-content {
    background: var(--cpng-bg-elevated);
    border-radius: var(--cpng-radius-xl);
    padding: 2rem 2.5rem;
    text-align: center;
    box-shadow: var(--cpng-shadow-xl);
    min-width: 340px;
    max-width: 440px;
    width: 90%;
    border: 1px solid var(--cpng-border);
}

.progress-stages {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin-bottom: 1.5rem;
}

.stage-dot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    color: var(--cpng-text-secondary);
    transition: color 0.3s;
}

.stage-dot i, .stage-dot svg {
    width: 20px;
    height: 20px;
    padding: 6px;
    background: var(--cpng-bg-secondary);
    border-radius: 50%;
    transition: all 0.3s;
    box-sizing: content-box;
}

.stage-dot span {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.stage-dot.active i,
.stage-dot.active svg  { background: var(--cpng-primary); color: white; }
.stage-dot.active       { color: var(--cpng-primary); }
.stage-dot.done i,
.stage-dot.done svg    { background: #22c55e; color: white; }
.stage-dot.done         { color: #22c55e; }

.stage-connector {
    width: 28px;
    height: 2px;
    background: var(--cpng-border);
    margin: 0 0.25rem 1rem;
    flex-shrink: 0;
}

.progress-bar-container {
    height: 8px;
    background: var(--cpng-border);
    border-radius: var(--cpng-radius-full);
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-bar {
    height: 100%;
    background: var(--cpng-primary);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: var(--cpng-radius-full);
}

.processing-status {
    color: var(--cpng-text);
    font-size: 0.9rem;
    font-weight: 500;
    margin: 0 0 0.25rem;
}

.progress-text {
    font-size: 0.82rem;
    color: var(--cpng-text-muted);
    margin: 0;
}

/* ============================================
   Results Section
   ============================================ */
.results-section {
    padding: 2.5rem;
    text-align: center;
}

.results-header { margin-bottom: 2rem; }

.success-icon {
    width: 72px;
    height: 72px;
    background: var(--cpng-success);
    border-radius: var(--cpng-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    color: white;
    transition: background-color var(--cpng-transition);
}

.success-icon svg, .success-icon i { width: 36px; height: 36px; }

.results-header h2 {
    font-size: 1.75rem;
    color: var(--cpng-text);
    margin: 0 0 0.5rem 0;
}

.results-header p {
    color: var(--cpng-text-muted);
    margin: 0;
}

/* Compressed files grid */
.compressed-files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    text-align: left;
}

.compressed-files-grid:has(.compressed-file-item:only-child) {
    grid-template-columns: minmax(160px, 220px);
    justify-content: center;
}

.compressed-file-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: var(--cpng-bg-secondary);
    border: 1px solid var(--cpng-border);
    border-radius: var(--cpng-radius-md);
    transition: all 0.2s ease;
}

.compressed-file-item:hover {
    border-color: var(--cpng-primary);
    box-shadow: var(--cpng-shadow-md);
}

.compressed-file-preview {
    width: 100%;
    height: 100px;
    border-radius: var(--cpng-radius-sm);
    background: var(--cpng-bg-tertiary);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.75rem;
    border: 1px solid var(--cpng-border);
}

.compressed-file-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.compressed-file-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--cpng-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.compressed-file-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.75rem;
    color: var(--cpng-text-muted);
    margin-bottom: 0.75rem;
}

.size-reduction { color: var(--cpng-success); font-weight: 600; }
.size-increase  { color: var(--cpng-danger);  font-weight: 600; }

.compressed-file-download {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.5rem;
    background: var(--cpng-primary);
    color: white;
    border-radius: var(--cpng-radius-md);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.compressed-file-download:hover { background: var(--cpng-primary-dark); }

/* Results stats */
.results-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.stat-item { text-align: center; }

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--cpng-text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--cpng-text);
}

.stat-item.highlight .stat-value { color: var(--cpng-primary); }
.stat-item.savings   .stat-value { color: var(--cpng-success);  }

.stat-arrow { color: var(--cpng-text-muted); }

/* Results actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.cpng-optimize-nudge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    margin: 1.25rem auto 0;
    font-size: 0.875rem;
    color: var(--cpng-text-secondary);
    text-align: center;
}
.cpng-optimize-nudge a {
    color: var(--cpng-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.cpng-optimize-nudge a:hover {
    color: var(--cpng-primary-hover);
}

/* ============================================
   Error Message
   ============================================ */
.error-message {
    background: var(--cpng-danger-light);
    border: 1px solid var(--cpng-danger);
    color: var(--cpng-danger);
    padding: 1rem 1.25rem;
    border-radius: var(--cpng-radius-md);
    margin: 1.25rem;
    font-weight: 500;
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

.error-message a { color: var(--cpng-danger); font-weight: 700; }

/* Toast notifications */
.cpng-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 0.9rem 1.25rem;
    background: var(--cpng-danger-light);
    border: 1px solid var(--cpng-danger);
    border-radius: var(--cpng-radius-md);
    color: var(--cpng-danger);
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    z-index: 9999;
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    animation: cpng-slide-in 0.3s ease;
    max-width: 380px;
}

.cpng-toast svg, .cpng-toast i { width: 18px; height: 18px; flex-shrink: 0; margin-top: 2px; }
.cpng-toast-body { flex: 1; font-size: 0.9rem; line-height: 1.5; }
.cpng-toast-body a { color: var(--cpng-danger); font-weight: 700; }

.cpng-toast-close {
    background: none;
    border: none;
    color: var(--cpng-danger);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    flex-shrink: 0;
    font-size: 1.1rem;
}

@keyframes cpng-slide-in {
    from { opacity: 0; transform: translateX(80px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ============================================
   Related Tools
   ============================================ */
.cpng-related-box {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--cpng-bg-elevated);
    border-radius: var(--cpng-radius-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--cpng-border);
    box-shadow: var(--cpng-shadow-sm);
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

.cpng-related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--cpng-text);
    font-size: 0.9rem;
    white-space: nowrap;
}

.cpng-related-label svg,
.cpng-related-label i { color: var(--cpng-primary); width: 16px; height: 16px; }

.cpng-related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.cpng-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--cpng-bg-secondary);
    border-radius: var(--cpng-radius-full);
    color: var(--cpng-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--cpng-border);
}

.cpng-pill:hover {
    background: var(--cpng-primary);
    color: white;
    border-color: var(--cpng-primary);
    transform: translateY(-2px);
}

.cpng-pill svg, .cpng-pill i { width: 15px; height: 15px; }

/* ============================================
   Info Cards (GIF-style with shadow/border)
   ============================================ */
.cpng-info-wrap {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.cpng-info-card {
    background: var(--cpng-bg-elevated);
    border-radius: var(--cpng-radius-xl);
    padding: 2rem;
    box-shadow: var(--cpng-shadow-md);
    border: 1px solid var(--cpng-border);
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

.cpng-info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    color: var(--cpng-text);
    margin: 0 0 1.5rem 0;
}

.cpng-info-card h2 svg,
.cpng-info-card h2 i { color: var(--cpng-primary); width: 24px; height: 24px; }

/* Steps list */
.cpng-steps {
    counter-reset: cpng-step;
    list-style: none;
    padding: 0;
    margin: 0;
}

.cpng-steps li {
    position: relative;
    padding-left: 3.25rem;
    margin-bottom: 1rem;
    counter-increment: cpng-step;
    color: var(--cpng-text-secondary);
    line-height: 1.6;
}

.cpng-steps li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2rem;
    bottom: 0;
    width: 2px;
    background: var(--cpng-primary-light);
}

.cpng-steps li::before {
    content: counter(cpng-step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--cpng-primary);
    color: white;
    border-radius: var(--cpng-radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    z-index: 1;
}

.cpng-steps li:last-child { margin-bottom: 0; }

.cpng-steps li strong { color: var(--cpng-text); }

.cpng-steps li a { color: var(--cpng-primary); text-decoration: none; }
.cpng-steps li a:hover { text-decoration: underline; }

/* Tip block */
.cpng-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background: var(--cpng-warning-light);
    border-radius: var(--cpng-radius-md);
    font-size: 0.9rem;
    color: var(--cpng-text-secondary);
    line-height: 1.6;
}

.cpng-tip i, .cpng-tip svg { color: var(--cpng-warning); flex-shrink: 0; margin-top: 2px; }
.cpng-tip a { color: var(--cpng-warning); font-weight: 600; text-decoration: none; }
.cpng-tip a:hover { text-decoration: underline; }

/* Mode explanations */
.cpng-method-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cpng-method-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.cpng-method-tag {
    flex-shrink: 0;
    padding: 0.35rem 0.85rem;
    border-radius: var(--cpng-radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    color: white;
}

.cpng-method-tag.lossy    { background: var(--cpng-warning); }
.cpng-method-tag.lossless { background: var(--cpng-success); }
.cpng-method-tag.alpha    { background: var(--cpng-accent);  }

.cpng-method-item p {
    margin: 0;
    color: var(--cpng-text-secondary);
    line-height: 1.6;
}

.cpng-method-item a { color: var(--cpng-primary); text-decoration: none; }
.cpng-method-item a:hover { text-decoration: underline; }

/* Benefits grid */
.cpng-benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.cpng-benefit-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.cpng-benefit-icon {
    width: 40px;
    height: 40px;
    background: var(--cpng-primary-light);
    border-radius: var(--cpng-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cpng-primary);
    flex-shrink: 0;
    transition: background-color var(--cpng-transition);
}

.cpng-benefit-content h4 { margin: 0 0 0.25rem; font-size: 1rem; color: var(--cpng-text); }
.cpng-benefit-content p  { margin: 0; font-size: 0.9rem; color: var(--cpng-text-secondary); line-height: 1.5; }
.cpng-benefit-content a  { color: var(--cpng-primary); text-decoration: none; }
.cpng-benefit-content a:hover { text-decoration: underline; }

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.faq-item {
    border: 1px solid var(--cpng-border);
    border-radius: var(--cpng-radius-md);
    overflow: hidden;
    transition: border-color var(--cpng-transition);
}

.faq-item.open { border-color: var(--cpng-primary); }

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--cpng-bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--cpng-text);
    text-align: left;
    transition: all 0.2s ease;
    gap: 0.75rem;
}

.faq-question:hover { background: var(--cpng-bg-tertiary); }

.faq-question svg,
.faq-question i {
    flex-shrink: 0;
    color: var(--cpng-primary);
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.faq-item.open .faq-question svg,
.faq-item.open .faq-question i { transform: rotate(180deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer { max-height: 300px; }

.faq-answer p {
    padding: 1rem 1.25rem;
    margin: 0;
    color: var(--cpng-text-secondary);
    line-height: 1.7;
    border-top: 1px solid var(--cpng-border);
    background: var(--cpng-bg-elevated);
    transition: background-color var(--cpng-transition), border-color var(--cpng-transition);
}

.faq-answer a { color: var(--cpng-primary); text-decoration: none; }
.faq-answer a:hover { text-decoration: underline; }

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--cpng-scroll-track); border-radius: 4px; }
::-webkit-scrollbar-thumb { background: var(--cpng-scroll-thumb); border-radius: 4px; }

/* ============================================
   Animations
   ============================================ */
@keyframes cpng-spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.cpng-spin { animation: cpng-spin 1s linear infinite; }

@keyframes cpng-fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.editor-section,
.results-section { animation: cpng-fade-in 0.4s ease; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .tool-container { padding: 1rem; }

    .tool-icon-wrapper { width: 50px; height: 50px; }
    .tool-icon-wrapper svg, .tool-icon-wrapper i { width: 22px; height: 22px; }

    .upload-section { padding: 2rem 1.5rem; }
    .upload-area    { padding: 2.5rem 1.5rem; }

    .files-grid { 
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        padding: 1rem 1.5rem;
    }

    .settings-panel { padding: 1.5rem; }

    .cpng-settings-row { grid-template-columns: 1fr; gap: 1.25rem; }

    .compression-presets { grid-template-columns: 1fr; }

    .action-bar { 
        flex-direction: column;
        padding: 1.25rem;
    }

    .btn { width: 100%; }

    .results-section { padding: 2rem 1.5rem; }

    .compressed-files-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }

    .results-stats { flex-direction: column; gap: 1rem; }
    .stat-arrow    { transform: rotate(90deg); }

    .results-actions { flex-direction: column; }
    .results-actions .btn { width: 100%; }

    .cpng-related-box { flex-direction: column; align-items: flex-start; }

    .cpng-info-card { padding: 1.5rem; }

    .cpng-benefits-grid { grid-template-columns: 1fr; }

    .cpng-method-item { flex-direction: column; gap: 0.5rem; }
}

@media (max-width: 480px) {
    .tool-title-row { flex-direction: column; gap: 0.75rem; }
    .files-grid     { grid-template-columns: repeat(2, 1fr); }
    .compressed-files-grid { grid-template-columns: 1fr 1fr; }
    .cpng-mode-tabs { flex-direction: column; }
}

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

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