/* SVG to PNG & PNG to SVG Converter Styles */
.hidden { display: none !important; }

/* Tabs */
.tab-nav { display: flex; gap: 4px; background: var(--bg-color); padding: 4px; border-radius: var(--radius-md); margin-bottom: 24px; border: 1px solid var(--border-color); }
.tab-btn { flex: 1; padding: 12px 20px; border: none; background: transparent; color: var(--text-muted); font-weight: 600; font-size: 0.95rem; border-radius: 6px; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px; transition: var(--transition); font-family: var(--font-family); }
.tab-btn:hover { color: var(--text-main); background: rgba(37, 99, 235, 0.05); }
.tab-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.tab-btn.active { background: var(--accent); color: white; box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3); }
.tab-btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* Converter Layout */
.converter-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }

/* Input Panel */
.input-panel { display: flex; flex-direction: column; gap: 16px; }
.form-section { margin-bottom: 16px; }
.form-section-title { font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.form-section-title svg { width: 14px; height: 14px; color: var(--accent); }

/* Upload Area */
.upload-area { border: 2px dashed var(--border-color); border-radius: var(--radius); padding: 36px 20px; text-align: center; cursor: pointer; transition: var(--transition); background: var(--bg-color); }
.upload-area:hover, .upload-area.dragover { border-color: var(--accent); background: var(--accent-light); }
.upload-area:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.upload-area svg { width: 40px; height: 40px; color: var(--accent); margin-bottom: 10px; }
.upload-area h3 { font-size: 1rem; margin-bottom: 4px; color: var(--text-main); }
.upload-area p { font-size: 0.85rem; color: var(--text-muted); }
[data-theme="dark"] .upload-area { background: var(--card-bg); }
[data-theme="dark"] .upload-area:hover, [data-theme="dark"] .upload-area.dragover { background: rgba(59, 130, 246, 0.08); }

/* SVG Code Textarea */
.svg-code-area { width: 100%; min-height: 140px; padding: 12px; background: var(--bg-color); color: var(--text-main); border: 1px solid var(--border-color); border-radius: var(--radius-md); font-family: 'SFMono-Regular', Consolas, 'Courier New', monospace; font-size: 0.85rem; line-height: 1.5; resize: vertical; transition: var(--transition); box-sizing: border-box; }
.svg-code-area:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12); }
.svg-code-area::placeholder { color: var(--text-muted); opacity: 0.7; }
[data-theme="dark"] .svg-code-area { background: var(--card-bg); }

/* Options */
.options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.option-group { display: flex; flex-direction: column; gap: 6px; }
.option-group label { font-weight: 600; font-size: 0.85rem; color: var(--text-main); }
.option-group select, .option-group input[type="color"] { padding: 8px 10px; background: var(--bg-color); color: var(--text-main); border: 1px solid var(--border-color); border-radius: 6px; font-size: 0.85rem; font-family: var(--font-family); transition: var(--transition); cursor: pointer; }
.option-group select:focus, .option-group input[type="color"]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12); }
.option-group select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10px center; padding-right: 28px; }
.option-group input[type="color"] { width: 100%; height: 38px; padding: 2px; }
[data-theme="dark"] .option-group select, [data-theme="dark"] .option-group input[type="color"] { background: var(--card-bg); }
.option-group .toggle-row { display: flex; align-items: center; gap: 10px; }
.option-group .toggle-row label { margin-bottom: 0; cursor: pointer; }

/* Preview Panel */
.preview-panel { display: flex; flex-direction: column; gap: 16px; }
.preview-box { width: 100%; aspect-ratio: 1; max-width: 400px; background: var(--bg-color); border: 2px dashed var(--border-color); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 10px; transition: var(--transition); overflow: hidden; position: relative; margin: 0 auto; }
.preview-box.has-result { border-style: solid; background: var(--card-bg); }
.preview-box svg.placeholder-icon { width: 56px; height: 56px; color: var(--text-muted); opacity: 0.4; }
.preview-box .placeholder-text { color: var(--text-muted); font-size: 0.9rem; text-align: center; padding: 0 16px; }
.preview-box img, .preview-box canvas, .preview-box svg { max-width: 100%; max-height: 100%; object-fit: contain; display: none; }
.preview-box.has-result img, .preview-box.has-result canvas, .preview-box.has-result svg { display: block; }
.preview-box.has-result svg { width: 100%; height: 100%; }
#svgPreview, #pngPreview { image-rendering: auto; }

/* Download & Action Buttons */
.action-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.action-buttons .btn { flex: 1; min-width: 90px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-size: 0.9rem; padding: 10px 16px; }
.action-buttons .btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* File info */
.file-info { font-size: 0.82rem; color: var(--text-muted); text-align: center; padding: 6px 10px; background: var(--bg-color); border-radius: 6px; border: 1px solid var(--border-color); display: none; }
.file-info.show { display: block; }
[data-theme="dark"] .file-info { background: var(--card-bg); }

/* Checkerboard background for transparency preview */
.checker-bg { background-image: linear-gradient(45deg, #ccc 25%, transparent 25%), linear-gradient(-45deg, #ccc 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #ccc 75%), linear-gradient(-45deg, transparent 75%, #ccc 75%); background-size: 20px 20px; background-position: 0 0, 0 10px, 10px -10px, -10px 0px; }

/* Stats */
.stat-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.stat-item { font-size: 0.8rem; color: var(--text-muted); }

/* Error */
.converter-error { background: rgba(239, 68, 68, 0.08); color: #ef4444; padding: 12px 16px; border-radius: var(--radius-md); margin-top: 12px; font-weight: 500; font-size: 0.9rem; border: 1px solid rgba(239, 68, 68, 0.2); display: none; align-items: center; gap: 8px; }
.converter-error.show { display: flex; }
.converter-error svg { width: 18px; height: 18px; flex-shrink: 0; }
[data-theme="dark"] .converter-error { background: rgba(239, 68, 68, 0.12); }

/* Privacy Notice */
.privacy-notice { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 16px; background: rgba(16, 185, 129, 0.08); border: 1px solid rgba(16, 185, 129, 0.2); border-radius: var(--radius-md); color: #10b981; font-size: 0.88rem; font-weight: 600; margin-top: 20px; }
.privacy-notice svg { width: 16px; height: 16px; flex-shrink: 0; }
[data-theme="dark"] .privacy-notice { background: rgba(16, 185, 129, 0.1); }

/* Toast */
.toast-notification { position: fixed; bottom: 24px; right: 24px; background: var(--card-bg); color: var(--text-main); padding: 14px 24px; border-radius: var(--radius-md); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15); font-weight: 600; font-size: 0.9rem; transform: translateY(100px); opacity: 0; transition: all 0.35s cubic-bezier(0.68, -0.55, 0.265, 1.55); z-index: 1000; display: flex; align-items: center; gap: 10px; border-left: 4px solid #10b981; max-width: 360px; pointer-events: none; }
.toast-notification.show { transform: translateY(0); opacity: 1; pointer-events: auto; }
.toast-notification.error { border-left-color: #ef4444; }
.toast-notification svg { width: 18px; height: 18px; flex-shrink: 0; }
[data-theme="dark"] .toast-notification { background: var(--card-bg); border-color: var(--border-color); }

/* Content sections (matching tools.css patterns) */
.content-section { padding: 64px 0; }
.content-section.bg-alt { background: var(--bg-color); }
.content-section h2 { text-align: center; font-size: 1.65rem; font-weight: 800; margin-bottom: 16px; color: var(--text-main); letter-spacing: -0.5px; }
.content-section > .container > p { text-align: center; color: var(--text-muted); max-width: 700px; margin: 0 auto 48px; line-height: 1.7; font-size: 1rem; }
.content-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.content-card { text-align: center; padding: 32px 20px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); transition: var(--transition); }
.content-card:hover { border-color: var(--accent); box-shadow: var(--card-shadow-hover); }
.content-card .card-icon { width: 56px; height: 56px; margin: 0 auto 16px; background: var(--accent-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--accent); }
.content-card .card-icon svg { width: 26px; height: 26px; }
.content-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.content-card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.65; }

/* Feature Grid */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; max-width: 1000px; margin-left: auto; margin-right: auto; }
.feature-item { text-align: center; padding: 28px 20px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius); transition: var(--transition); }
.feature-item:hover { border-color: var(--accent); box-shadow: var(--card-shadow-hover); }
.feature-item svg { width: 32px; height: 32px; color: var(--accent); margin-bottom: 14px; }
.feature-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; color: var(--text-main); }
.feature-item p { color: var(--text-muted); font-size: 0.88rem; line-height: 1.6; }

/* Knowledge/Content section */
.knowledge-content { max-width: 860px; margin: 0 auto; }
.knowledge-content h3 { font-size: 1.15rem; font-weight: 700; margin: 28px 0 12px; color: var(--text-main); }
.knowledge-content p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.7; margin-bottom: 16px; }
.knowledge-content ul { padding-left: 24px; margin-bottom: 20px; }
.knowledge-content ul li { color: var(--text-muted); font-size: 0.92rem; line-height: 1.7; margin-bottom: 6px; }
.knowledge-content table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.9rem; }
.knowledge-content th, .knowledge-content td { padding: 10px 14px; border: 1px solid var(--border-color); text-align: left; color: var(--text-main); }
.knowledge-content th { background: var(--bg-color); font-weight: 700; }
.knowledge-content td { color: var(--text-muted); }

/* Related Tools */
.related-tools { padding: 60px 0; background: var(--bg-color); text-align: center; }
.related-tools h2 { font-size: 1.5rem; font-weight: 800; margin-bottom: 32px; color: var(--text-main); }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; max-width: 700px; margin: 0 auto; }
.related-link { display: flex; align-items: center; gap: 10px; padding: 12px 18px; background: var(--card-bg); border: 1px solid var(--border-color); border-radius: var(--radius-md); color: var(--text-main); font-weight: 600; font-size: 0.88rem; text-decoration: none; transition: var(--transition); }
.related-link:hover { border-color: var(--accent); color: var(--accent); box-shadow: var(--card-shadow-hover); }
.related-link svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--accent); }

/* Dark mode specifics */
[data-theme="dark"] .preview-box { background: var(--card-bg); border-color: var(--border-color); }
[data-theme="dark"] .preview-box.has-result { background: var(--card-bg); }
[data-theme="dark"] .upload-area h3 { color: var(--text-main); }

/* Responsive */
@media (max-width: 1024px) {
  .converter-layout { gap: 20px; }
}
@media (max-width: 900px) {
  .converter-layout { grid-template-columns: 1fr; gap: 28px; }
  .preview-box { max-width: 320px; }
  .content-grid { grid-template-columns: 1fr; gap: 20px; }
  .feature-grid { grid-template-columns: 1fr; gap: 20px; }
  .content-section { padding: 48px 0; }
}
@media (max-width: 768px) {
  .action-buttons { flex-direction: column; }
  .action-buttons .btn { width: 100%; }
  .options-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .content-section > .container > p { margin-bottom: 32px; }
}
@media (max-width: 600px) {
  .tab-btn { padding: 10px 14px; font-size: 0.85rem; }
  .upload-area { padding: 24px 16px; }
  .upload-area svg { width: 32px; height: 32px; }
  .content-section h2 { font-size: 1.35rem; }
  .related-grid { grid-template-columns: 1fr; }
  .knowledge-content table { font-size: 0.82rem; }
  .knowledge-content th, .knowledge-content td { padding: 6px 8px; }
}
@media (max-width: 425px) {
  .tool-card { padding: 20px 16px; }
  .preview-box { max-width: 260px; }
  .content-card { padding: 24px 16px; }
  .feature-item { padding: 24px 16px; }
  .svg-code-area { min-height: 100px; font-size: 0.8rem; }
}
@media (max-width: 375px) {
  .tab-btn { padding: 8px 10px; font-size: 0.8rem; }
  .action-buttons .btn { font-size: 0.82rem; padding: 8px 14px; min-height: 40px; }
}
@media (max-width: 320px) {
  .tool-card { padding: 16px 12px; }
  .preview-box { max-width: 220px; }
}