:root {
    --bg-main: #1e1e2e;
    --bg-surface: #282840;
    --bg-editor: #1a1a2e;
    --text-main: #e0e0e0;
    --text-muted: #8b8b9e;
    --accent-blue: #64b5f6;
    --accent-hover: #42a5f5;
    --success: #66bb6a;
    --error: #ef5350;
    --warning: #ffa726;
    --border: #3a3a5c;
    --font-ui: 'Inter', 'Segoe UI', sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

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

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

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

.header-controls {
    display: flex;
    gap: 12px;
}

select {
    background: var(--bg-editor);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 4px;
    font-family: var(--font-ui);
    outline: none;
}

.primary-btn {
    background-color: var(--accent-blue);
    color: #12121c;
    border: none;
    padding: 6px 16px;
    border-radius: 4px;
    font-family: var(--font-ui);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.primary-btn:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 8px rgba(100, 181, 246, 0.4);
}
.primary-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Layout Grid */
.main-layout {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 16px;
    gap: 16px;
    overflow: hidden;
}

.top-panels {
    display: flex;
    gap: 16px;
    height: 50%;
}

.panel {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.editor-panel {
    flex: 2;
}

.pipeline-panel {
    flex: 1;
    min-width: 250px;
}

.bottom-panel {
    flex: 1;
    height: 50%;
}

.panel-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    letter-spacing: 1px;
}

/* Editor */
.editor-container {
    display: flex;
    flex: 1;
    background-color: var(--bg-editor);
    overflow: hidden;
    position: relative;
}

.line-numbers {
    padding: 12px 8px;
    background-color: #151525;
    color: var(--text-muted);
    font-family: var(--font-code);
    font-size: 14px;
    line-height: 1.5;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border);
    overflow-y: hidden;
    min-width: 40px;
}

#source-editor {
    flex: 1;
    background: transparent;
    color: var(--text-main);
    font-family: var(--font-code);
    font-size: 14px;
    line-height: 1.5;
    padding: 12px;
    border: none;
    resize: none;
    outline: none;
    white-space: pre;
    overflow-wrap: normal;
    overflow-x: auto;
}

/* Pipeline */
.pipeline-content {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pipeline-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px;
    border-radius: 4px;
    transition: background 0.2s;
    cursor: default;
}
.pipeline-item.clickable {
    cursor: pointer;
}
.pipeline-item.clickable:hover {
    background-color: rgba(255,255,255,0.05);
}

.status-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}
.status-pending .status-icon {
    border: 2px solid var(--text-muted);
    color: transparent;
}
.status-running .status-icon {
    border: 2px solid var(--accent-blue);
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

.status-success .status-icon { background: var(--success); color: #fff; }
.status-error .status-icon { background: var(--error); color: #fff; }
.status-skipped .status-icon { background: var(--border); color: var(--text-muted); }

.pipeline-text {
    display: flex;
    flex-direction: column;
}
.pipeline-name { font-weight: 500; font-size: 0.95rem; }
.pipeline-desc { font-size: 0.8rem; color: var(--text-muted); }

.pipeline-footer {
    padding: 8px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: rgba(0,0,0,0.1);
}

/* Tabs */
.tabs-header {
    display: flex;
    background-color: #202030;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}
.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 10px 16px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    white-space: nowrap;
}
.tab-btn:hover { color: var(--text-main); }
.tab-btn.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

.tabs-content {
    flex: 1;
    overflow: hidden;
    position: relative;
    background-color: var(--bg-editor);
}
.tab-pane {
    display: none;
    height: 100%;
    overflow: auto;
    padding: 12px;
}
.tab-pane.active {
    display: block;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-code);
    font-size: 0.9rem;
}
.data-table th, .data-table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.data-table th {
    color: var(--accent-blue);
    font-weight: 500;
    position: sticky;
    top: 0;
    background: var(--bg-editor);
}
.data-table tbody tr:hover { background-color: rgba(255,255,255,0.03); }

/* Code blocks */
.code-output {
    font-family: var(--font-code);
    font-size: 14px;
    color: var(--text-main);
    line-height: 1.5;
    white-space: pre;
}

/* AST specific */
#ast-canvas-container {
    width: 100%;
    height: calc(100% - 40px);
    overflow: auto;
    position: relative;
    cursor: grab;
}
.view-toggle {
    text-align: right;
    margin-bottom: 8px;
}
.view-toggle button {
    background: transparent;
    color: var(--accent-blue);
    border: 1px solid var(--border);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 0.8rem;
}
.view-toggle button:hover { background: rgba(100,181,246,0.1); }
#ast-json { font-family: var(--font-code); font-size: 13px; color: var(--text-main); }

/* Errors */
.error-item {
    background: rgba(239, 83, 80, 0.1);
    border-left: 3px solid var(--error);
    padding: 10px;
    margin-bottom: 8px;
    font-family: var(--font-code);
    font-size: 0.9rem;
}
.error-phase { font-weight: bold; color: var(--error); margin-bottom: 4px; display: block;}

/* Scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }