:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #059669;
    --danger-color: #dc2626;

    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --text-primary: #111827;
    --text-secondary: #6b7280;

    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);

    --radius-md: 6px;
    --transition-base: 150ms ease;
}

[data-theme="dark"] {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --border-color: #374151;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.header-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

.header-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-base);
}

.header-link:hover {
    color: var(--primary-color);
}

.package-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-right: 4px;
}

.package-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--primary-color);
    color: white !important;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-base);
}

.package-link:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.package-link svg {
    flex-shrink: 0;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    padding: 0;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.theme-toggle svg {
    width: 16px;
    height: 16px;
}

/* Main Layout */
.main-layout {
    display: flex;
    min-height: calc(100vh - 49px);
}

.sidebar-left,
.sidebar-right {
    width: 120px;
    flex-shrink: 0;
}

.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

.tabsOption {
    flex: 1;
    padding: 10px 16px;
    background: transparent;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    margin: 0;
}

.tabsOption:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.tabsOption.active {
    background: var(--primary-color);
    color: white;
}

/* Container */
.container {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 24px;
}

/* Section Headers */
.section-header {
    font-size: 13px;
    font-weight: 600;
    margin: 0 0 8px;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Main Conversion Area */
.main-conversion-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.conversion-panel {
    display: flex;
    flex-direction: column;
}

/* Textareas */
textarea {
    width: 100%;
    min-height: 350px;
    padding: 12px;
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 13px;
    background: var(--bg-primary);
    color: var(--text-primary);
    resize: vertical;
    transition: border-color var(--transition-base);
    line-height: 1.5;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

textarea::placeholder {
    color: var(--text-secondary);
}

/* Buttons */
button {
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

button:active {
    transform: scale(0.98);
}

#jsonToToonBtn,
#yamlToToonBtn,
#xmlToToonBtn,
#csvToToonBtn,
#validateBtn {
    background: var(--secondary-color);
    color: white;
}

#jsonToToonBtn:hover,
#yamlToToonBtn:hover,
#xmlToToonBtn:hover,
#csvToToonBtn:hover,
#validateBtn:hover {
    background: #047857;
}

#toonToJsonBtn,
#toonToYamlBtn,
#toonToXmlBtn,
#toonToCsvBtn {
    background: var(--primary-color);
    color: white;
}

#toonToJsonBtn:hover,
#toonToYamlBtn:hover,
#toonToXmlBtn:hover,
#toonToCsvBtn:hover {
    background: var(--primary-dark);
}

#jsonDownloadAllBtn,
#yamlDownloadAllBtn,
#xmlDownloadAllBtn,
#csvDownloadAllBtn,
#jsonToonDownloadAllBtn,
#yamlToonDownloadAllBtn,
#xmlToonDownloadAllBtn,
#csvToonDownloadAllBtn {
    background: #f59e0b;
    color: white;
    display: none;
}

#jsonDownloadAllBtn:hover,
#yamlDownloadAllBtn:hover,
#xmlDownloadAllBtn:hover,
#csvDownloadAllBtn:hover,
#jsonToonDownloadAllBtn:hover,
#yamlToonDownloadAllBtn:hover,
#xmlToonDownloadAllBtn:hover,
#csvToonDownloadAllBtn:hover {
    background: #d97706;
}

/* File Input */
input[type="file"] {
    padding: 10px;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    width: 100%;
    margin-bottom: 12px;
    font-size: 14px;
}

input[type="file"]:hover {
    border-color: var(--primary-color);
}

/* File Status */
.file-status {
    margin-top: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border-left: 3px solid var(--primary-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
}

.file-status strong {
    color: var(--text-primary);
    border: none;
    padding: 0;
    margin: 0;
}

/* Error Messages */
.error {
    color: var(--danger-color);
    font-weight: 500;
    padding: 10px 12px;
    background: rgba(220, 38, 38, 0.1);
    border-radius: var(--radius-md);
    margin: 12px 0;
    display: block;
    font-size: 14px;
}

.error:empty {
    display: none;
}

/* Sections */
#jsonSection,
#yamlSection,
#xmlSection,
#csvSection,
#validatorSection {
    display: none;
}

#jsonSection {
    display: block;
}

/* Horizontal Rule */
hr {
    border: none;
    height: 1px;
    background: var(--border-color);
    margin: 24px 0;
}

/* Ads */
.ads {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.horizontal-ads {
    width: 100%;
    max-height: 90px;
    display: flex;
    justify-content: center;
}

.vertical-ads {
    position: sticky;
    top: 60px;
    width: 120px;
    height: 600px;
    margin: 20px 0;
}

iframe {
    height: 100%;
    width: 100%;
    border: none;
}

/* Info Sections */
.info-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.info-section h1 {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 12px;
    color: var(--text-primary);
}

.info-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    font-size: 14px;
}

.info-section ul {
    list-style: none;
    padding: 0;
}

.info-section li {
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    color: var(--text-secondary);
    font-size: 14px;
}

.info-section li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.info-section strong {
    color: var(--text-primary);
    border: none;
    padding: 0;
    margin: 0;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media screen and (max-width: 1024px) {

    .sidebar-left,
    .sidebar-right {
        display: none;
    }
}

@media screen and (max-width: 768px) {
    .header {
        padding: 10px 15px;
    }

    .header-title {
        font-size: 16px;
    }

    .header-links {
        gap: 12px;
    }

    .header-link {
        font-size: 13px;
    }

    .package-label {
        display: none;
    }

    .package-link {
        padding: 5px 10px;
        font-size: 12px;
        gap: 4px;
    }

    .package-link svg {
        width: 12px;
        height: 12px;
    }

    .main-content {
        padding: 15px;
    }

    .tabs {
        flex-direction: column;
        gap: 0;
        padding: 0;
    }

    .tabsOption {
        display: none;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color);
        padding: 14px;
    }

    .tabsOption.active {
        display: block !important;
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        position: relative;
    }

    .tabs.active .tabsOption {
        display: block !important;
    }

    .tabs.active .tabsOption:last-child {
        border-radius: 0 0 var(--radius-md) var(--radius-md);
    }

    .tabsOption.active::after {
        content: "▼";
        position: absolute;
        right: 16px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 10px;
    }

    .tabs.active .tabsOption.active::after {
        transform: translateY(-50%) rotate(180deg);
    }

    .main-conversion-area {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    textarea {
        min-height: 250px;
        font-size: 12px;
    }

    button {
        width: 100%;
        margin-bottom: 10px;
    }

    .container {
        padding: 16px;
    }
}

@media screen and (max-width: 480px) {
    textarea {
        min-height: 200px;
    }
}

@media print {

    .ads,
    .vertical-ads,
    .horizontal-ads,
    button,
    input[type="file"],
    .theme-toggle,
    .header-links {
        display: none !important;
    }

    body {
        background: white;
    }
}