/* ============================================================
   DB DIAGRAM STUDIO - Main Stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=DM+Sans:wght@400;500;600;700&display=swap');

:root {
    /* Core palette - dark professional */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --bg-elevated: #21262d;
    --bg-canvas: #0a0e14;

    /* Accents */
    --accent-primary: #58a6ff;
    --accent-secondary: #3fb950;
    --accent-warning: #d29922;
    --accent-danger: #f85149;
    --accent-purple: #bc8cff;
    --accent-pink: #f778ba;
    --accent-orange: #f0883e;

    /* Text */
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-tertiary: #6e7681;
    --text-link: #58a6ff;

    /* Borders */
    --border-default: #30363d;
    --border-muted: #21262d;
    --border-active: #58a6ff;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px rgba(88,166,255,0.15);

    /* Sizing */
    --sidebar-width: 340px;
    --header-height: 48px;
    --toolbar-height: 40px;

    /* Typography */
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* --- Reset --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* --- App Shell --- */
.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* --- Header --- */
.app-header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
    z-index: 100;
    flex-shrink: 0;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 15px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.app-logo svg {
    width: 22px;
    height: 22px;
}

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

/* Mode tabs */
.mode-tabs {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 3px;
    gap: 2px;
    margin-left: 16px;
}

.mode-tab {
    padding: 5px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    white-space: nowrap;
    font-family: var(--font-sans);
}

.mode-tab:hover {
    color: var(--text-primary);
    background: var(--bg-elevated);
}

.mode-tab.active {
    color: var(--text-primary);
    background: var(--bg-elevated);
    box-shadow: var(--shadow-sm);
}

.mode-tab .tab-icon {
    margin-right: 5px;
    font-size: 11px;
}

/* Header actions */
.header-spacer { flex: 1; }

.header-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.header-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--border-default);
    border-radius: 6px;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    white-space: nowrap;
}

.header-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-active);
    background: var(--bg-elevated);
}

.header-btn.primary {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
}

.header-btn.primary:hover {
    background: #4c9aed;
}

.header-btn svg {
    width: 14px;
    height: 14px;
}

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

/* --- Editor Panel --- */
.editor-panel {
    width: var(--sidebar-width);
    min-width: 280px;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-default);
    flex-shrink: 0;
}

.editor-toolbar {
    height: var(--toolbar-height);
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 8px;
    border-bottom: 1px solid var(--border-default);
    background: var(--bg-tertiary);
}

.editor-toolbar-title {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.editor-toolbar .spacer { flex: 1; }

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 5px;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.toolbar-btn svg {
    width: 14px;
    height: 14px;
}

/* Code editor area */
.editor-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.code-editor {
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    outline: none;
    resize: none;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.65;
    tab-size: 2;
    white-space: pre;
    overflow: auto;
    user-select: text;
    -webkit-user-select: text;
}

.code-editor:focus {
    outline: none;
}

.code-editor::selection {
    background: rgba(88, 166, 255, 0.25);
}

/* Line numbers gutter */
.editor-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.line-numbers {
    width: 44px;
    padding: 16px 8px 16px 0;
    text-align: right;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.65;
    color: var(--text-tertiary);
    background: var(--bg-primary);
    border-right: 1px solid var(--border-muted);
    overflow: hidden;
    user-select: none;
    flex-shrink: 0;
}

/* --- Resize Handle --- */
.resize-handle {
    width: 4px;
    cursor: col-resize;
    background: transparent;
    transition: background var(--transition-fast);
    flex-shrink: 0;
    z-index: 10;
}

.resize-handle:hover,
.resize-handle.active {
    background: var(--accent-primary);
}

/* --- Canvas Panel --- */
.canvas-panel {
    flex: 1;
    position: relative;
    background: var(--bg-canvas);
    overflow: hidden;
}

/* Grid background */
.canvas-grid {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, var(--border-muted) 1px, transparent 1px);
    background-size: 20px 20px;
    pointer-events: none;
    z-index: 0;
}

/* Canvas viewport */
.canvas-viewport {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 1;
}

.canvas-transform {
    position: absolute;
    transform-origin: 0 0;
    will-change: transform;
}

/* --- Table Nodes (DBML) --- */
.db-table {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    min-width: 220px;
    max-width: 340px;
    box-shadow: var(--shadow-md);
    cursor: move;
    transition: box-shadow var(--transition-fast);
    z-index: 5;
}

.db-table:hover {
    box-shadow: var(--shadow-glow), var(--shadow-md);
    border-color: var(--accent-primary);
}

.db-table.dragging {
    z-index: 50;
    box-shadow: var(--shadow-lg);
    opacity: 0.95;
}

.table-header {
    padding: 10px 14px;
    background: var(--accent-primary);
    border-radius: 7px 7px 0 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.table-header .table-icon {
    font-size: 12px;
    opacity: 0.8;
}

.table-header .table-name {
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    font-family: var(--font-mono);
    letter-spacing: -0.3px;
}

.table-header-enum {
    background: var(--accent-purple);
}

.table-columns {
    padding: 4px 0;
}

.table-column {
    display: flex;
    align-items: center;
    padding: 5px 14px;
    gap: 8px;
    font-size: 12px;
    font-family: var(--font-mono);
    transition: background var(--transition-fast);
}

.table-column:hover {
    background: var(--bg-tertiary);
}

.col-key {
    width: 16px;
    font-size: 9px;
    font-weight: 700;
    text-align: center;
    flex-shrink: 0;
}

.col-key.pk {
    color: var(--accent-warning);
}

.col-key.fk {
    color: var(--accent-purple);
}

.col-key.idx {
    color: var(--accent-secondary);
}

.col-name {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
}

.col-type {
    color: var(--text-secondary);
    font-size: 11px;
}

.col-constraints {
    font-size: 10px;
    color: var(--accent-orange);
    font-weight: 500;
}

/* --- Relationship Lines --- */
.relationship-lines {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.relationship-lines svg {
    width: 100%;
    height: 100%;
}

.rel-line {
    stroke: var(--accent-primary);
    stroke-width: 1.5;
    fill: none;
    opacity: 0.6;
}

.rel-line:hover {
    stroke-width: 2.5;
    opacity: 1;
}

/* --- Mermaid / Markdown Render Area --- */
.render-area {
    position: absolute;
    inset: 0;
    padding: 40px;
    overflow: auto;
    z-index: 1;
}

.render-area.mermaid-render {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 60px;
}

.render-area.mermaid-render svg {
    max-width: 100%;
    height: auto;
}

.render-area.markdown-render {
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    max-width: 800px;
    margin: 0 auto;
}

.markdown-render h1 { font-size: 28px; margin: 32px 0 16px; font-weight: 700; color: var(--text-primary); border-bottom: 1px solid var(--border-default); padding-bottom: 8px; }
.markdown-render h2 { font-size: 22px; margin: 28px 0 12px; font-weight: 700; color: var(--text-primary); }
.markdown-render h3 { font-size: 18px; margin: 24px 0 10px; font-weight: 600; color: var(--text-primary); }
.markdown-render p { margin: 0 0 14px; }
.markdown-render a { color: var(--accent-primary); text-decoration: none; }
.markdown-render a:hover { text-decoration: underline; }
.markdown-render code { background: var(--bg-tertiary); padding: 2px 6px; border-radius: 4px; font-family: var(--font-mono); font-size: 13px; }
.markdown-render pre { background: var(--bg-secondary); border: 1px solid var(--border-default); border-radius: 8px; padding: 16px; margin: 16px 0; overflow-x: auto; }
.markdown-render pre code { background: transparent; padding: 0; }
.markdown-render blockquote { border-left: 3px solid var(--accent-primary); padding: 4px 16px; margin: 16px 0; color: var(--text-secondary); background: var(--bg-tertiary); border-radius: 0 6px 6px 0; }
.markdown-render ul, .markdown-render ol { padding-left: 24px; margin: 8px 0 16px; }
.markdown-render li { margin: 4px 0; }
.markdown-render table { border-collapse: collapse; width: 100%; margin: 16px 0; }
.markdown-render th, .markdown-render td { padding: 8px 14px; border: 1px solid var(--border-default); text-align: left; }
.markdown-render th { background: var(--bg-tertiary); font-weight: 600; }
.markdown-render img { max-width: 100%; border-radius: 8px; }
.markdown-render hr { border: none; border-top: 1px solid var(--border-default); margin: 24px 0; }

/* --- Canvas Controls --- */
.canvas-controls {
    position: absolute;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 20;
}

.canvas-ctrl-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 16px;
}

.canvas-ctrl-btn:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

.zoom-display {
    font-size: 11px;
    font-weight: 600;
    text-align: center;
    color: var(--text-tertiary);
    padding: 4px 0;
    font-family: var(--font-mono);
}

/* --- Status Bar --- */
.status-bar {
    height: 26px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    padding: 0 12px;
    gap: 16px;
    font-size: 11px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-secondary);
}

.status-dot.error {
    background: var(--accent-danger);
}

.status-spacer { flex: 1; }

/* --- Modal Overlay --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 12px;
    padding: 24px;
    min-width: 400px;
    max-width: 560px;
    box-shadow: var(--shadow-lg);
    transform: translateY(10px) scale(0.98);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-box {
    transform: translateY(0) scale(1);
}

.modal-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-body { margin-bottom: 20px; }

.modal-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    transition: border-color var(--transition-fast);
}

.modal-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.modal-select {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    cursor: pointer;
}

.modal-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.modal-btn {
    padding: 8px 18px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-default);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

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

.modal-btn.primary {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #fff;
}

.modal-btn.primary:hover {
    background: #4c9aed;
}

/* --- Share link area --- */
.share-link-box {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.share-link-box input {
    flex: 1;
    padding: 8px 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-default);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
}

/* --- Toast notifications --- */
.toast-container {
    position: fixed;
    top: 60px;
    right: 16px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.toast.success { border-left: 3px solid var(--accent-secondary); }
.toast.error { border-left: 3px solid var(--accent-danger); }
.toast.info { border-left: 3px solid var(--accent-primary); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

/* --- Loading Spinner --- */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-default);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* --- Error Panel --- */
.error-panel {
    background: rgba(248,81,73,0.1);
    border: 1px solid rgba(248,81,73,0.3);
    border-radius: 6px;
    padding: 8px 12px;
    margin: 8px;
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--accent-danger);
    display: none;
}

.error-panel.visible {
    display: block;
}

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

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

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

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

/* --- Responsive --- */
@media (max-width: 768px) {
    .editor-panel {
        width: 100% !important;
        max-width: none;
    }

    .canvas-panel {
        display: none;
    }

    .app-main.show-canvas .editor-panel {
        display: none;
    }

    .app-main.show-canvas .canvas-panel {
        display: block;
    }

    .mode-tabs {
        display: none;
    }

    .header-btn span {
        display: none;
    }
}

/* --- Watermark --- */
.canvas-watermark {
    position: absolute;
    bottom: 60px;
    left: 20px;
    font-size: 11px;
    color: var(--text-tertiary);
    opacity: 0.4;
    z-index: 2;
    pointer-events: none;
    font-family: var(--font-sans);
}

/* --- Empty state --- */
.empty-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-tertiary);
    z-index: 3;
}

.empty-state svg {
    width: 48px;
    height: 48px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 14px;
    text-align: center;
    line-height: 1.5;
}

/* --- Templates dropdown --- */
.templates-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: 8px;
    padding: 4px;
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    display: none;
}

.templates-dropdown.open { display: block; }

.template-item {
    display: block;
    width: 100%;
    padding: 8px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 12px;
    font-family: var(--font-sans);
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.template-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.template-item .template-name {
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.template-item .template-desc {
    font-size: 11px;
    color: var(--text-tertiary);
}