/**
 * ToolDuck Diagram Studio — Stylesheet (diagram-studio.css)
 * ===============================================================
 * Professional Developer Diagramming Workspace:
 *   - Dashboard & Project Management views
 *   - High-density, professional 3-panel editor shell
 *   - Interactive vector canvas styling, grid patterns & connection handles
 *   - Dark & Light theme integration
 *   - Responsive breakpoints for desktop, laptop, and tablet
 */

:root {
    --diag-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
    --diag-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --diag-canvas-bg: #f8fafc;
    --diag-panel-bg: #ffffff;
    --diag-sidebar-bg: #ffffff;
    --diag-border: #e2e8f0;
    --diag-border-subtle: #f1f5f9;
    --diag-ink: #0f172a;
    --diag-ink-muted: #64748b;
    --diag-ink-subtle: #94a3b8;
    --diag-brand: #6366f1;
    --diag-brand-hover: #4f46e5;
    --diag-brand-soft: #e0e7ff;
    --diag-success: #10b981;
    --diag-warning: #f59e0b;
    --diag-danger: #ef4444;
    --diag-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --diag-elevated-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
}

html[data-theme="dark"] {
    --diag-canvas-bg: #0b0f17;
    --diag-panel-bg: #131b2a;
    --diag-sidebar-bg: #0f172a;
    --diag-border: #1e293b;
    --diag-border-subtle: #172033;
    --diag-ink: #f8fafc;
    --diag-ink-muted: #94a3b8;
    --diag-ink-subtle: #64748b;
    --diag-brand: #818cf8;
    --diag-brand-hover: #6366f1;
    --diag-brand-soft: rgba(99, 102, 241, 0.18);
    --diag-card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --diag-elevated-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

/* -----------------------------------------------------------------
   1. Studio Application Wrapper
   ----------------------------------------------------------------- */
.diagram-studio-app {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 120px);
    width: 100%;
    background: var(--diag-canvas-bg);
    color: var(--diag-ink);
    font-family: var(--diag-font);
    position: relative;
    border: 1px solid var(--diag-border);
    border-radius: var(--radius, 12px);
    overflow: hidden;
    box-shadow: var(--diag-card-shadow);
}

/* -----------------------------------------------------------------
   2. Studio Dashboard Mode
   ----------------------------------------------------------------- */
.diag-dashboard-wrap {
    display: flex;
    flex: 1;
    min-height: 800px;
    width: 100%;
}

.diag-sidebar {
    width: 260px;
    min-width: 240px;
    background: var(--diag-sidebar-bg);
    border-right: 1px solid var(--diag-border);
    display: flex;
    flex-direction: column;
    padding: 1.25rem 1rem;
    gap: 1.5rem;
}

.diag-sidebar-brand {
    display: flex;
    align-items: center;
    gap: .65rem;
    padding: .25rem .5rem;
}

.diag-sidebar-brand-title {
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    color: var(--diag-ink);
}

.diag-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: .25rem;
}

.diag-sidebar-heading {
    font-size: .72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--diag-ink-subtle);
    padding: .5rem .65rem .25rem;
}

.diag-sidebar-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: .55rem .75rem;
    border-radius: 8px;
    background: transparent;
    border: none;
    font-size: .88rem;
    font-weight: 600;
    color: var(--diag-ink-muted);
    cursor: pointer;
    text-decoration: none;
    transition: all .15s ease;
}

.diag-sidebar-btn:hover {
    color: var(--diag-ink);
    background: var(--diag-border-subtle);
}

.diag-sidebar-btn.is-active {
    color: var(--diag-brand);
    background: var(--diag-brand-soft);
    font-weight: 700;
}

.diag-sidebar-btn-left {
    display: flex;
    align-items: center;
    gap: .6rem;
}

.diag-sidebar-badge {
    font-size: .72rem;
    font-weight: 700;
    padding: .15rem .45rem;
    border-radius: 999px;
    background: var(--diag-border);
    color: var(--diag-ink-muted);
}

.diag-sidebar-footer {
    margin-top: auto;
    padding: .85rem;
    background: var(--diag-canvas-bg);
    border: 1px solid var(--diag-border);
    border-radius: 8px;
    font-size: .78rem;
}

.diag-main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.75rem 2.25rem;
    overflow-y: auto;
    max-height: calc(100vh - 120px);
    gap: 2rem;
}

.diag-hero-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.25rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--diag-border);
}

.diag-hero-title {
    font-size: 1.65rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin: 0;
    color: var(--diag-ink);
}

.diag-hero-desc {
    font-size: .92rem;
    color: var(--diag-ink-muted);
    margin: .35rem 0 0;
}

/* -----------------------------------------------------------------
   3. Dashboard Sections & Cards
   ----------------------------------------------------------------- */
.diag-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.diag-section-title {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
    color: var(--diag-ink);
    display: flex;
    align-items: center;
    gap: .5rem;
}

.diag-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 1rem;
}

.diag-type-card {
    display: flex;
    flex-direction: column;
    padding: 1.15rem;
    background: var(--diag-panel-bg);
    border: 1px solid var(--diag-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all .2s ease;
    text-align: left;
    box-shadow: var(--diag-card-shadow);
}

.diag-type-card:hover {
    border-color: var(--diag-brand);
    transform: translateY(-2px);
    box-shadow: var(--diag-elevated-shadow);
}

.diag-type-card-icon {
    width: 38px;
    height: 38px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--diag-brand-soft);
    color: var(--diag-brand);
    margin-bottom: .85rem;
}

.diag-type-card-title {
    font-size: .96rem;
    font-weight: 700;
    color: var(--diag-ink);
    margin-bottom: .25rem;
}

.diag-type-card-desc {
    font-size: .8rem;
    color: var(--diag-ink-muted);
    line-height: 1.4;
    margin: 0;
}

/* Recent Projects Cards */
.diag-recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.diag-project-card {
    display: flex;
    flex-direction: column;
    background: var(--diag-panel-bg);
    border: 1px solid var(--diag-border);
    border-radius: 10px;
    overflow: hidden;
    transition: all .2s ease;
    box-shadow: var(--diag-card-shadow);
    cursor: pointer;
}

.diag-project-card:hover {
    border-color: var(--diag-brand);
    box-shadow: var(--diag-elevated-shadow);
}

.diag-project-preview {
    height: 140px;
    background: var(--diag-canvas-bg);
    border-bottom: 1px solid var(--diag-border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.diag-project-preview svg {
    max-width: 90%;
    max-height: 90%;
    pointer-events: none;
}

.diag-project-meta {
    padding: .85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: .35rem;
}

.diag-project-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
}

.diag-project-title {
    font-weight: 700;
    font-size: .94rem;
    color: var(--diag-ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.diag-project-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: .76rem;
    color: var(--diag-ink-muted);
    margin-top: .25rem;
}

.diag-badge-type {
    display: inline-flex;
    align-items: center;
    padding: .15rem .45rem;
    font-size: .7rem;
    font-weight: 700;
    text-transform: uppercase;
    border-radius: 4px;
    background: var(--diag-brand-soft);
    color: var(--diag-brand);
}

/* Template Cards */
.diag-template-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.15rem;
}

.diag-template-card {
    display: flex;
    flex-direction: column;
    background: var(--diag-panel-bg);
    border: 1px solid var(--diag-border);
    border-radius: 10px;
    padding: 1.15rem;
    gap: .6rem;
    transition: all .2s ease;
    box-shadow: var(--diag-card-shadow);
}

.diag-template-card:hover {
    border-color: var(--diag-brand);
    box-shadow: var(--diag-elevated-shadow);
}

.diag-template-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
}

.diag-template-title {
    font-size: .98rem;
    font-weight: 700;
    color: var(--diag-ink);
    margin: 0;
}

.diag-template-desc {
    font-size: .82rem;
    color: var(--diag-ink-muted);
    line-height: 1.45;
    margin: 0;
}

.diag-template-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-top: .4rem;
}

/* -----------------------------------------------------------------
   4. Shared Editor Workspace Shell
   ----------------------------------------------------------------- */
.diag-editor-wrap {
    display: flex;
    flex-direction: column;
    flex: 1;
    height: 100%;
    min-height: 750px;
    width: 100%;
    background: var(--diag-canvas-bg);
}

/* Top Toolbar */
.diag-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .75rem;
    padding: .65rem 1rem;
    background: var(--diag-panel-bg);
    border-bottom: 1px solid var(--diag-border);
    z-index: 20;
}

.diag-topbar-left {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.diag-title-input {
    font-size: 1rem;
    font-weight: 700;
    color: var(--diag-ink);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: .25rem .5rem;
    width: 240px;
    transition: all .15s ease;
}

.diag-title-input:hover {
    border-color: var(--diag-border);
}

.diag-title-input:focus {
    background: var(--diag-canvas-bg);
    border-color: var(--diag-brand);
    outline: none;
}

.diag-save-pill {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    font-size: .75rem;
    font-weight: 600;
    padding: .2rem .55rem;
    border-radius: 999px;
    color: var(--diag-ink-muted);
    background: var(--diag-border-subtle);
    border: 1px solid var(--diag-border);
}
.diag-save-pill.is-saved {
    color: #047857;
    background: #ecfdf5;
    border-color: #a7f3d0;
}
html[data-theme="dark"] .diag-save-pill.is-saved {
    color: #34d399;
    background: rgba(16, 185, 129, .15);
    border-color: rgba(16, 185, 129, .3);
}

.diag-topbar-center {
    display: flex;
    align-items: center;
    gap: .35rem;
    background: var(--diag-canvas-bg);
    padding: .2rem .35rem;
    border-radius: 8px;
    border: 1px solid var(--diag-border);
}

.diag-topbar-right {
    display: flex;
    align-items: center;
    gap: .45rem;
}

/* 3-Panel Editor Body */
.diag-body-panels {
    display: flex;
    flex: 1;
    position: relative;
    overflow: hidden;
    height: calc(100vh - 180px);
    min-height: 600px;
}

/* Left Palette Panel */
.diag-palette-panel {
    width: 260px;
    min-width: 240px;
    background: var(--diag-panel-bg);
    border-right: 1px solid var(--diag-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 10;
}

.diag-palette-head {
    padding: .85rem 1rem;
    font-weight: 700;
    font-size: .88rem;
    color: var(--diag-ink);
    border-bottom: 1px solid var(--diag-border-subtle);
}

.diag-palette-group {
    padding: .85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: .6rem;
    border-bottom: 1px solid var(--diag-border-subtle);
}

.diag-palette-title {
    font-size: .74rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--diag-ink-subtle);
    margin: 0;
}

.diag-palette-item {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding: .5rem .75rem;
    border-radius: 8px;
    background: var(--diag-canvas-bg);
    border: 1px solid var(--diag-border);
    font-size: .82rem;
    font-weight: 600;
    color: var(--diag-ink);
    cursor: pointer;
    transition: all .15s ease;
}

.diag-palette-item:hover {
    border-color: var(--diag-brand);
    color: var(--diag-brand);
    background: var(--diag-panel-bg);
}

/* Center Canvas */
.diag-canvas-panel {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--diag-canvas-bg);
    background-image: radial-gradient(var(--diag-border) 1.2px, transparent 1.2px);
    background-size: 20px 20px;
    cursor: grab;
    user-select: none;
}

.diag-canvas-panel:active {
    cursor: grabbing;
}

.diag-canvas-viewport {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-origin: 0 0;
}

.diag-canvas-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Right Properties Panel */
.diag-props-panel {
    width: 280px;
    min-width: 260px;
    background: var(--diag-panel-bg);
    border-left: 1px solid var(--diag-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 10;
    transition: all .2s ease;
}

.diag-props-panel.is-collapsed {
    width: 0;
    min-width: 0;
    border-left: none;
    overflow: hidden;
}

.diag-props-head {
    padding: .85rem 1rem;
    font-weight: 700;
    font-size: .88rem;
    color: var(--diag-ink);
    border-bottom: 1px solid var(--diag-border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.diag-props-body {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: .9rem;
}

.diag-prop-row {
    display: flex;
    flex-direction: column;
    gap: .3rem;
}

.diag-prop-label {
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--diag-ink-muted);
}

/* Floating Bottom Status Bar */
.diag-bottombar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .4rem .85rem;
    background: var(--diag-panel-bg);
    border-top: 1px solid var(--diag-border);
    font-size: .78rem;
    color: var(--diag-ink-muted);
    z-index: 20;
}

/* -----------------------------------------------------------------
   5. Modals & Code Drawer
   ----------------------------------------------------------------- */
.diag-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.diag-modal-card {
    background: var(--diag-panel-bg);
    border: 1px solid var(--diag-border);
    border-radius: 12px;
    width: 580px;
    max-width: 95vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--diag-elevated-shadow);
    overflow: hidden;
}

.diag-modal-head {
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--diag-border);
}

.diag-modal-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    color: var(--diag-ink);
}

.diag-modal-body {
    padding: 1.25rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.diag-modal-footer {
    padding: .85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: .5rem;
    border-top: 1px solid var(--diag-border);
    background: var(--diag-canvas-bg);
}

/* Code Editor Area */
.diag-code-textarea {
    width: 100%;
    height: 320px;
    font-family: var(--diag-mono);
    font-size: .86rem;
    line-height: 1.5;
    padding: .85rem;
    border-radius: 8px;
    background: var(--diag-canvas-bg);
    border: 1px solid var(--diag-border);
    color: var(--diag-ink);
    resize: vertical;
    white-space: pre;
}

/* Sequence Script Editor & Tabs (sequencediagram.org pattern) */
.diag-palette-panel.is-sequence {
    width: 340px;
    min-width: 280px;
}

.diag-script-tabs {
    display: flex;
    border-bottom: 1px solid var(--diag-border-subtle);
    background: var(--diag-panel-bg);
    padding: .35rem .5rem 0;
    gap: .25rem;
}

.diag-script-tab {
    flex: 1;
    padding: .45rem .6rem;
    font-size: .76rem;
    font-weight: 600;
    text-align: center;
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: 6px 6px 0 0;
    background: transparent;
    color: var(--diag-ink-muted);
    cursor: pointer;
    transition: all .15s ease;
}

.diag-script-tab:hover {
    color: var(--diag-ink);
}

.diag-script-tab.is-active {
    background: var(--diag-canvas-bg);
    border-color: var(--diag-border);
    color: var(--diag-brand);
    font-weight: 700;
}

.diag-script-textarea {
    width: 100%;
    height: 310px;
    font-family: var(--diag-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace);
    font-size: .80rem;
    line-height: 1.55;
    padding: .75rem;
    border-radius: 8px;
    background: var(--diag-canvas-bg);
    border: 1px solid var(--diag-border);
    color: var(--diag-ink);
    resize: vertical;
    white-space: pre;
    box-sizing: border-box;
    outline: none;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.diag-script-textarea:focus {
    border-color: var(--diag-brand);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.15);
}

.diag-chip-bar {
    display: flex;
    flex-wrap: wrap;
    gap: .3rem;
}

.diag-chip-btn {
    padding: .2rem .45rem;
    font-size: .72rem;
    font-weight: 600;
    font-family: var(--diag-mono, monospace);
    background: var(--diag-canvas-bg);
    border: 1px solid var(--diag-border);
    border-radius: 4px;
    color: var(--diag-ink);
    cursor: pointer;
    transition: all .12s ease;
}

.diag-chip-btn:hover {
    background: var(--diag-panel-bg);
    border-color: var(--diag-brand);
    color: var(--diag-brand);
}

/* Responsive adjustments */
@media (max-width: 900px) {
    .diag-dashboard-wrap {
        flex-direction: column;
    }
    .diag-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--diag-border);
    }
    .diag-palette-panel, .diag-props-panel {
        display: none;
    }
}