:root {
    --bg-main: #1a1a1a;
    --bg-secondary: #171717;
    --bg-tertiary: #131313;
    --text-primary: #e0e0e0;
    --text-secondary: #888888;
    --accent-pink: #ff80bf;
    --accent-purple: #9580ff;
    --border-color: #262626;
    --hover-bg: #212121;
    --selection-bg: rgba(149, 128, 255, 0.15);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --header-height: 48px;
    --tabs-height: 38px;
    --activity-bar-width: 48px;
    --sidebar-width: 280px;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
header {
    height: var(--header-height);
    padding: 0 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    z-index: 100;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

header h1 {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    background: linear-gradient(45deg, var(--accent-pink), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    white-space: nowrap;
}

.upload-zone-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.6rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.upload-zone-mini:hover {
    border-color: var(--accent-purple);
    color: var(--text-primary);
}

.upload-zone-mini input {
    display: none;
}

/* Main Content */
main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Activity Bar */
.activity-bar {
    width: var(--activity-bar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 0.5rem;
    flex-shrink: 0;
}

.activity-btn {
    width: var(--activity-bar-width);
    height: var(--activity-bar-width);
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.activity-btn:hover {
    color: var(--text-primary);
}

.activity-btn.active {
    color: var(--accent-purple);
}

.activity-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 20%;
    bottom: 20%;
    width: 2px;
    background: var(--accent-purple);
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-pane {
    display: none;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.sidebar-pane.active {
    display: flex;
}

.sidebar-header {
    height: var(--tabs-height);
    display: flex;
    align-items: center;
    padding: 0 1rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.sidebar-search {
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.sidebar-search input {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.4rem 0.6rem;
    color: var(--text-primary);
    font-size: 0.8rem;
    outline: none;
}

.sidebar-search input:focus {
    border-color: var(--accent-purple);
}

/* File Tree and Search Results */
.file-tree,
.search-results {
    flex: 1;
    overflow-y: auto;
    padding: 0.4rem 0;
}

.tree-item,
.search-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.3rem 0.8rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.1s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-item:hover,
.search-item:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.tree-item.active {
    background: var(--selection-bg);
    color: var(--accent-purple);
}

.tree-children {
    padding-left: 1rem;
}

/* Tree Icons */
.tree-icon,
.tab-icon {
    width: 18px;
    height: 18px;
    display: inline-block;
    background-color: currentColor;
    mask-size: contain;
    mask-repeat: no-repeat;
    mask-position: center;
    -webkit-mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-position: center;
}

.icon-collapsed {
    mask-image: url('icons/chevron-right.svg');
    -webkit-mask-image: url('icons/chevron-right.svg');
    opacity: 0.5;
}

.icon-expanded {
    mask-image: url('icons/chevron-down.svg');
    -webkit-mask-image: url('icons/chevron-down.svg');
    opacity: 0.5;
}

.icon-folder {
    mask-image: url('icons/folder.svg');
    -webkit-mask-image: url('icons/folder.svg');
    color: var(--accent-purple);
}

.icon-java {
    mask-image: url('icons/coffee.svg');
    -webkit-mask-image: url('icons/coffee.svg');
    color: var(--accent-pink);
}

.icon-text, .icon-json, .icon-xml {
    mask-image: url('icons/file-code.svg');
    -webkit-mask-image: url('icons/file-code.svg');
}

.icon-text {
    mask-image: url('icons/file-text.svg');
    -webkit-mask-image: url('icons/file-text.svg');
}

.icon-image {
    mask-image: url('icons/file-image.svg');
    -webkit-mask-image: url('icons/file-image.svg');
    color: #4ec9b0;
}

.icon-archive, .icon-resource {
    mask-image: url('icons/archive.svg');
    -webkit-mask-image: url('icons/archive.svg');
    color: #ce9178;
}

.icon-config {
    mask-image: url('icons/settings.svg');
    -webkit-mask-image: url('icons/settings.svg');
}

.tab-icon {
    margin-right: 4px;
}

/* Editor Area */
.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-main);
}

/* Tabs */
.tabs-container {
    height: var(--tabs-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    overflow-x: auto;
}

.tab {
    height: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 0.8rem;
    border-right: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    transition: background 0.2s;
}

.tab:hover {
    background: var(--hover-bg);
}

.tab.active {
    background: var(--bg-main);
    color: var(--accent-purple);
    border-top: 1px solid var(--accent-purple);
}

.tab-close {
    font-size: 14px;
    opacity: 0.4;
    padding: 2px;
}

.tab-close:hover {
    opacity: 1;
}

/* Editor Toolbar */
.editor-toolbar {
    padding: 0.4rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-main);
}

.toolbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    overflow: hidden;
}

.current-path {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.badges {
    display: flex;
    gap: 0.4rem;
}

.badge {
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Editor Content */
.editor-content {
    flex: 1;
    overflow: auto;
}

pre {
    margin: 0 !important;
    padding: 1rem !important;
    background: transparent !important;
    font-family: var(--font-mono) !important;
    font-size: 0.85rem !important;
    line-height: 1.5 !important;
}

/* Status Bar */
.status-bar {
    height: 24px;
    padding: 0 1rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.stats-group {
    display: flex;
    gap: 1rem;
}

.stat-item span {
    color: var(--accent-pink);
}

/* Buttons */
.btn {
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-xs {
    padding: 1px 4px;
    font-size: 0.6rem;
}

.btn-sm {
    padding: 3px 8px;
}

.btn-primary {
    background: var(--accent-purple);
    color: white;
    border: none;
}

.btn-ghost {
    background: transparent;
    border: none;
}

.btn-ghost:hover {
    background: var(--hover-bg);
}

/* Search Results UI */
.search-item {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.5rem 0.8rem;
    border-bottom: 1px solid var(--border-color);
}

.search-item-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.75rem;
    margin-bottom: 0.2rem;
}

.search-match {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {

    .sidebar,
    .activity-bar {
        display: none;
    }

    header h1 {
        font-size: 0.8rem;
    }
}

::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

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

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

/* Empty States */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
    gap: 1.25rem;
    animation: fadeIn 0.4s ease-out;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    opacity: 0.1;
    color: var(--accent-purple);
}

.empty-state p {
    font-size: 0.85rem;
    max-width: 280px;
    line-height: 1.5;
    opacity: 0.7;
    font-weight: 400;
}

.empty-state-mini {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 1.5rem;
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.75rem;
    gap: 0.5rem;
    opacity: 0.5;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}