* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-light: #eef2ff;
    --sidebar-width: 340px;
    --radius: 12px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --accent-light: #1e293b;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background 0.3s, color 0.3s;
    overflow-x: hidden;
}

.app {
    min-height: 100vh;
    display: flex;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.3s ease;
    z-index: 200;
    height: 100vh;
    position: sticky;
    top: 0;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.sidebar-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.sidebar-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.close-sidebar {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.75rem;
}

.search-box svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.search-box input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.collections-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    overflow-x: auto;
    padding-bottom: 0.25rem;
}

.collection-chip {
    padding: 0.25rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
    white-space: nowrap;
}

.collection-chip:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.collection-chip.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.search-info {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* SVG Library */
.svg-library {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.library-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: var(--text-secondary);
    text-align: center;
}

.library-loading small {
    margin-top: 0.5rem;
    font-size: 0.7rem;
    opacity: 0.7;
}

.loader {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 0.75rem;
}

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

.svg-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 0.5rem;
    border: 1px solid transparent;
}

.svg-item:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.svg-item.selected {
    background: var(--accent-light);
    border-color: var(--accent);
}

.svg-preview {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.svg-preview svg {
    width: 28px;
    height: 28px;
}

.svg-info {
    flex: 1;
    min-width: 0;
}

.svg-name {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.svg-collection {
    font-size: 0.65rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: monospace;
}

.library-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.7rem;
    text-align: center;
    flex-shrink: 0;
}

.credit a {
    color: var(--accent);
    text-decoration: none;
}

.credit a:hover {
    text-decoration: underline;
}

/* Main Content */
.main-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent);
}

.logo span span {
    color: var(--accent);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.2s;
}

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

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Main */
.main {
    flex: 1;
    padding: 1rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Toolbar */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.toolbar-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn-tool {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-tool:hover {
    background: var(--accent-light);
    border-color: var(--accent);
    color: var(--accent);
}

.btn-tool svg {
    width: 18px;
    height: 18px;
}

/* Split Layout */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .split-layout {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    background: var(--bg-primary);
}

.panel-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: monospace;
}

/* Code Editor */
.code-editor {
    flex: 1;
    min-height: 400px;
}

#svgEditor {
    width: 100%;
    height: 100%;
    min-height: 400px;
    padding: 1rem;
    font-family: 'Fira Code', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.5;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    resize: vertical;
    outline: none;
}

/* Preview */
.preview-container {
    flex: 1;
    min-height: 400px;
    overflow: auto;
    position: relative;
}

.preview-inner {
    min-height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.svg-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
}

.svg-wrapper svg {
    max-width: 100%;
    height: auto;
    max-height: 350px;
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder svg {
    margin-bottom: 0.75rem;
    opacity: 0.5;
}

.placeholder small {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.75rem;
}

.preview-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.btn-icon-sm {
    width: 28px;
    height: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.btn-icon-sm:hover {
    background: var(--accent-light);
    border-color: var(--accent);
}

.zoom-level {
    font-size: 0.75rem;
    min-width: 45px;
    text-align: center;
    font-family: monospace;
}

.panel-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.background-options {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    font-size: 0.875rem;
}

.bg-option {
    width: 32px;
    height: 32px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    background: transparent;
    font-size: 1.2rem;
}

.bg-option.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-light);
}

/* Export Section */
.export-section {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.tabs {
    display: flex;
    gap: 0.25rem;
    padding: 0.75rem 1rem 0;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.tab {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 8px 8px 0 0;
    transition: all 0.2s;
}

.tab:hover {
    color: var(--accent);
}

.tab.active {
    color: var(--accent);
    background: var(--bg-primary);
    border-bottom: 2px solid var(--accent);
}

.export-content {
    padding: 1rem;
    position: relative;
}

.export-code {
    background: var(--bg-primary);
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 12px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-copy-export {
    margin-top: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.btn-copy-export:hover {
    background: var(--accent-hover);
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    width: 52px;
    height: 52px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    z-index: 250;
    align-items: center;
    justify-content: center;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        z-index: 200;
        height: 100vh;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .close-sidebar {
        display: block;
    }
    
    .overlay.active {
        display: block;
    }
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 999px;
    font-size: 0.875rem;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}