/**
 * QueryCraft - Next-Gen SaaS UI/UX Stylesheet
 * Self-contained, robust layout architecture inspired by Linear, Supabase, and VS Code.
 */

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

pre, code {
    font-family: var(--qc-font-mono);
}

pre {
    white-space: pre-wrap !important;
    word-break: break-word !important;
    overflow-x: auto !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
}

html, body {
    min-height: 100vh;
    min-height: 100dvh;
    width: 100%;
    font-family: var(--qc-font-sans);
    background-color: var(--qc-bg-app);
    color: var(--qc-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* App Container */
#qc-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    width: 100%;
}

/* Top Navbar */
.qc-navbar {
    height: var(--qc-header-h);
    background-color: var(--qc-bg-surface);
    border-bottom: 1px solid var(--qc-border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 100;
    flex-shrink: 0;
}

.qc-nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--qc-text-main);
}

.qc-mobile-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
    border-radius: var(--qc-radius-md);
    background: var(--qc-bg-input);
    border: 1px solid var(--qc-border-color);
    color: var(--qc-text-muted);
    cursor: pointer;
    transition: all 0.15s ease;
}
.qc-mobile-menu-btn:hover {
    background: var(--qc-bg-hover);
    color: var(--qc-text-main);
    border-color: var(--qc-border-strong);
}

.qc-logo-icon {
    width: 34px;
    height: 34px;
    background: var(--qc-primary-gradient);
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 900;
    font-size: 14px;
    box-shadow: var(--qc-primary-glow);
}

.qc-tagline {
    font-size: 0.78rem;
    color: var(--qc-text-muted);
    font-weight: 400;
    padding-left: 12px;
    border-left: 1px solid var(--qc-border-color);
}

.qc-nav-center {
    display: flex;
    align-items: center;
    gap: 14px;
}

.qc-db-select-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--qc-bg-input);
    border: 1px solid var(--qc-border-color);
    padding: 6px 12px;
    border-radius: var(--qc-radius-md);
    font-size: 0.82rem;
    transition: border-color 0.15s ease;
}
.qc-db-select-wrapper:hover {
    border-color: var(--qc-border-strong);
}

.qc-select {
    background: transparent;
    border: none;
    color: var(--qc-text-main);
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    outline: none;
}
.qc-select option, select option {
    background-color: var(--qc-bg-surface-solid) !important;
    color: var(--qc-text-main) !important;
    padding: 8px 12px;
}

.qc-search-trigger {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--qc-bg-input);
    border: 1px solid var(--qc-border-color);
    padding: 6px 14px;
    border-radius: var(--qc-radius-full);
    color: var(--qc-text-muted);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s ease;
}
.qc-search-trigger:hover {
    color: var(--qc-text-main);
    border-color: var(--qc-primary);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.2);
}

.qc-kbd {
    background: var(--qc-bg-hover);
    border: 1px solid var(--qc-border-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-family: var(--qc-font-mono);
}

.qc-nav-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Main Layout Grid */
.qc-main-layout {
    display: flex;
    flex: 1;
    height: calc(100vh - var(--qc-header-h));
    overflow: hidden;
    position: relative;
}

/* Sidebar Navigation */
.qc-sidebar {
    width: var(--qc-sidebar-w);
    background-color: var(--qc-bg-surface);
    border-right: 1px solid var(--qc-border-color);
    display: flex;
    flex-direction: column;
    padding: 16px 10px;
    gap: 20px;
    overflow-y: auto;
    flex-shrink: 0;
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.qc-nav-group-title {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--qc-text-dim);
    margin-bottom: 6px;
    padding-left: 10px;
    font-weight: 800;
}

.qc-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.qc-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 9px 12px;
    border-radius: var(--qc-radius-md);
    color: var(--qc-text-muted);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.15s ease;
    cursor: pointer;
    border-left: 3px solid transparent;
}

.qc-nav-item:hover {
    background: var(--qc-bg-hover);
    color: var(--qc-text-main);
}

.qc-nav-item.active {
    background: var(--qc-bg-active);
    color: var(--qc-primary);
    font-weight: 700;
    border-left-color: var(--qc-primary);
}

/* Workspace Area */
.qc-workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--qc-bg-app);
    overflow: hidden;
    position: relative;
}

.qc-view {
    display: none;
    flex: 1;
    flex-direction: column;
    height: 100%;
    overflow: auto;
}

.qc-view.active {
    display: flex;
}

/* SQL Editor Split Workspace */
.qc-editor-workspace {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.qc-toolbar {
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background-color: var(--qc-bg-surface-solid);
    border-bottom: 1px solid var(--qc-border-color);
    flex-shrink: 0;
}

.qc-toolbar-left, .qc-toolbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Action Buttons */
.qc-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--qc-radius-md);
    font-size: 0.82rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: all 0.18s ease;
    outline: none;
    min-height: 36px;
}

.qc-btn-sm { padding: 5px 10px; font-size: 0.78rem; min-height: 30px; }
.qc-btn-xs { padding: 4px 8px; font-size: 0.72rem; min-height: 26px; }

.qc-btn-primary {
    background: var(--qc-primary-gradient);
    color: #ffffff;
    box-shadow: var(--qc-primary-glow);
}
.qc-btn-primary:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.qc-btn-secondary {
    background: var(--qc-bg-input);
    color: var(--qc-text-main);
    border: 1px solid var(--qc-border-color);
}
.qc-btn-secondary:hover {
    background: var(--qc-bg-hover);
    border-color: var(--qc-border-strong);
}

.qc-btn-ghost {
    background: transparent;
    color: var(--qc-text-muted);
}
.qc-btn-ghost:hover {
    background: var(--qc-bg-hover);
    color: var(--qc-text-main);
}

.qc-btn-danger {
    background: var(--qc-danger);
    color: #ffffff;
}

.qc-btn-success {
    background: var(--qc-success);
    color: #ffffff;
}

/* SQL Code Editor Component */
.qc-editor-container {
    display: flex;
    flex: 1;
    min-height: 200px;
    background-color: var(--qc-bg-app);
    position: relative;
    font-family: var(--qc-font-mono);
    font-size: var(--qc-editor-font-size);
    line-height: 1.6;
    overflow: hidden;
}

.qc-editor-gutter {
    width: 48px;
    background-color: var(--qc-bg-surface-solid);
    border-right: 1px solid var(--qc-border-color);
    user-select: none;
    color: var(--qc-text-dim);
    text-align: right;
    padding: 12px 10px 12px 0;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    overflow: hidden;
}

.qc-editor-body {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.qc-highlight-overlay, .qc-editor-textarea {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 12px 16px;
    margin: 0;
    border: 0;
    outline: 0;
    box-sizing: border-box;
    font-family: var(--qc-font-mono);
    font-size: var(--qc-editor-font-size);
    line-height: 1.6;
    letter-spacing: 0px;
    word-spacing: 0px;
    tab-size: 4;
    -moz-tab-size: 4;
    white-space: pre;
    overflow: auto;
    background: transparent;
}

.qc-highlight-overlay {
    pointer-events: none;
    color: var(--qc-text-main);
    z-index: 1;
    margin: 0;
}

.qc-highlight-overlay code.qc-code-highlight {
    display: block;
    margin: 0;
    padding: 0;
    border: 0;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    white-space: inherit;
}

.qc-editor-textarea {
    color: transparent;
    -webkit-text-fill-color: transparent;
    caret-color: var(--qc-primary);
    z-index: 2;
    resize: none;
}

/* Syntax Tokens */
.hl-keyword { color: var(--hl-keyword); font-weight: 700; }
.hl-string { color: var(--hl-string); }
.hl-number { color: var(--hl-number); }
.hl-comment { color: var(--hl-comment); font-style: italic; }
.hl-symbol { color: var(--hl-symbol); }

/* Execution Stats Bar */
.qc-stats-bar {
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background-color: var(--qc-bg-surface-solid);
    border-top: 1px solid var(--qc-border-color);
    border-bottom: 1px solid var(--qc-border-color);
    font-size: 0.78rem;
    color: var(--qc-text-muted);
    flex-shrink: 0;
}

.qc-stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.qc-stat-value {
    color: var(--qc-text-main);
    font-weight: 700;
    font-family: var(--qc-font-mono);
}

/* Result Grid Area */
.qc-results-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: auto;
    background-color: var(--qc-bg-app);
}

.qc-table-wrapper {
    flex: 1;
    overflow: auto;
}

.qc-results-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.82rem;
    text-align: left;
}

.qc-results-table th {
    position: sticky;
    top: 0;
    background-color: var(--qc-bg-surface-solid);
    color: var(--qc-text-muted);
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 10px 14px;
    border-bottom: 1px solid var(--qc-border-color);
    z-index: 10;
    white-space: nowrap;
}

.qc-results-table td {
    padding: 9px 14px;
    border-bottom: 1px solid var(--qc-border-color);
    color: var(--qc-text-main);
    font-family: var(--qc-font-mono);
    white-space: nowrap;
}

.qc-results-table tr:nth-child(even) td {
    background-color: rgba(255, 255, 255, 0.02);
}

.qc-results-table tr:hover td {
    background-color: var(--qc-bg-hover);
}

.qc-th-idx, .qc-td-idx {
    width: 48px;
    color: var(--qc-text-dim);
    text-align: center;
    font-weight: 400;
}

.qc-null-badge {
    color: var(--qc-text-dim);
    font-style: italic;
    font-size: 0.75rem;
}

/* Status Badges */
.qc-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: var(--qc-radius-full);
    font-size: 0.72rem;
    font-weight: 700;
}

.qc-badge-secondary { background: var(--qc-bg-hover); color: var(--qc-text-muted); }
.qc-badge-success { background: var(--qc-success-bg); color: var(--qc-success); }
.qc-badge-danger { background: var(--qc-danger-bg); color: var(--qc-danger); }
.qc-badge-beginner { background: var(--qc-success-bg); color: var(--qc-success); }
.qc-badge-intermediate { background: var(--qc-warning-bg); color: var(--qc-warning); }
.qc-badge-advanced { background: var(--qc-danger-bg); color: var(--qc-danger); }

/* Schema Explorer Component */
.qc-schema-view-mount {
    padding: 16px 24px;
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
}

.qc-schema-header {
    margin-bottom: 20px;
}

.qc-schema-db-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.qc-schema-search-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--qc-bg-input);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-md);
    color: var(--qc-text-main);
    font-size: 0.88rem;
    outline: none;
    transition: border-color 0.15s ease;
}
.qc-schema-search-input:focus {
    border-color: var(--qc-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.qc-table-item {
    background: var(--qc-bg-card);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-md);
    margin-bottom: 12px;
    overflow: hidden;
}

.qc-table-node {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    cursor: pointer;
    user-select: none;
}

.qc-table-node:hover { background: var(--qc-bg-hover); }

.qc-table-name { font-weight: 700; flex: 1; }
.qc-table-count { font-size: 0.8rem; color: var(--qc-text-dim); }

.qc-columns-list {
    padding: 8px 16px 16px 40px;
    border-top: 1px solid var(--qc-border-color);
    background: var(--qc-bg-surface-solid);
}

.qc-column-node {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 0;
    font-size: 0.85rem;
    cursor: pointer;
}
.qc-column-node:hover { color: var(--qc-primary); }

.qc-pk-badge, .qc-fk-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 800;
}
.qc-pk-badge { background: #f59e0b; color: #000000; }
.qc-fk-badge { background: #a855f7; color: #ffffff; }

/* Challenge View & Learning Cards */
.qc-challenge-mount-view {
    padding: 24px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.qc-challenge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.qc-challenge-card {
    background: var(--qc-bg-card);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 14px;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.qc-challenge-card:hover {
    transform: translateY(-3px);
    border-color: var(--qc-primary);
    box-shadow: var(--qc-shadow-md);
}

.qc-challenge-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--qc-text-main);
    margin: 0;
}

.qc-challenge-desc {
    flex: 1 1 auto;
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--qc-text-muted);
    margin: 0;
}

.qc-challenge-card-footer {
    margin-top: auto;
    padding-top: 12px;
}

.qc-challenge-card-footer .qc-btn {
    width: 100%;
    justify-content: center;
}

/* Interactive Lessons Grid & Cards */
.qc-lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.qc-lesson-card {
    background: var(--qc-bg-card);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 14px;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.qc-lesson-card:hover {
    transform: translateY(-3px);
    border-color: var(--qc-primary);
    box-shadow: var(--qc-shadow-md);
}

.qc-lesson-card-top {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

.qc-lesson-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--qc-text-main);
    margin: 0;
}

.qc-lesson-desc {
    flex: 1 1 auto;
    font-size: 0.88rem;
    line-height: 1.55;
    color: var(--qc-text-muted);
    margin: 0;
}

.qc-lesson-card-footer {
    margin-top: auto;
    padding-top: 12px;
}

.qc-lesson-card-footer .qc-btn {
    width: 100%;
    justify-content: center;
}

/* Saved Queries Grid & Cards */
.qc-saved-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.qc-saved-card {
    background: var(--qc-bg-card);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 12px;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.qc-saved-card:hover {
    transform: translateY(-3px);
    border-color: var(--qc-primary);
    box-shadow: var(--qc-shadow-md);
}

.qc-saved-card-top {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

.qc-saved-card-footer {
    margin-top: auto;
    padding-top: 12px;
    display: flex;
    gap: 8px;
}

/* Modern Glass Pill Tab Navigation */
.qc-tab-group {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--qc-border-color);
    border-radius: var(--qc-radius-lg);
    padding: 5px;
    backdrop-filter: blur(12px);
    margin-bottom: 20px;
}

.qc-tab-btn {
    appearance: none;
    -webkit-appearance: none;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--qc-radius-md);
    color: var(--qc-text-muted);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 8px 16px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    outline: none;
}

.qc-tab-btn:hover {
    color: var(--qc-text-main);
    background: var(--qc-bg-hover);
    border-color: rgba(255, 255, 255, 0.08);
}

.qc-tab-btn.active {
    background: var(--qc-primary);
    color: #ffffff;
    font-weight: 700;
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
    transform: translateY(-1px);
}

.qc-tab-btn:focus-visible {
    box-shadow: 0 0 0 2px var(--qc-primary);
}

.qc-tab-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 2px 7px;
    border-radius: 999px;
    font-size: 0.74rem;
    font-weight: 700;
    background: rgba(255, 255, 255, 0.12);
    color: currentColor;
}

.qc-tab-btn.active .qc-tab-count {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

/* Toast Notifications */
.qc-toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
    pointer-events: none;
}

.qc-toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    border-radius: var(--qc-radius-md);
    background: var(--qc-bg-surface-solid);
    color: var(--qc-text-main);
    box-shadow: var(--qc-shadow-lg);
    border: 1px solid var(--qc-border-color);
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: auto;
}
.qc-toast.is-visible {
    opacity: 1;
    transform: translateY(0);
}
.qc-toast-success { border-left: 4px solid var(--qc-success); }
.qc-toast-error { border-left: 4px solid var(--qc-danger); }
.qc-toast-warning { border-left: 4px solid var(--qc-warning); }

/* Modals */
.qc-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(6px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.qc-modal-overlay.is-open {
    display: flex;
}

.qc-modal {
    background: var(--qc-bg-surface-solid);
    border: 1px solid var(--qc-border-strong);
    border-radius: var(--qc-radius-lg);
    width: 100%;
    max-width: 600px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--qc-shadow-lg);
    overflow: hidden;
}

.qc-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--qc-border-color);
}

.qc-modal-body {
    padding: 20px;
    overflow-y: auto;
}

/* ==========================================================================
   ER Diagram System Styles (Matching Professional Reference ERD)
   ========================================================================== */

.qc-schema-explorer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--qc-border-color);
}

.qc-schema-view-toggle {
    display: flex;
    gap: 4px;
    background: var(--qc-bg-input);
    padding: 4px;
    border-radius: var(--qc-radius-md);
    border: 1px solid var(--qc-border-color);
}

.qc-schema-tab-btn {
    background: transparent;
    border: none;
    color: var(--qc-text-muted);
    padding: 6px 16px;
    border-radius: var(--qc-radius-sm);
    font-size: 0.84rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.qc-schema-tab-btn:hover {
    color: var(--qc-text-main);
    background: var(--qc-bg-hover);
}

.qc-schema-tab-btn.active {
    background: var(--qc-primary);
    color: #ffffff;
    box-shadow: var(--qc-shadow-sm);
}

/* ERD Workspace Container */
.qc-erd-workspace {
    position: relative;
    width: 100%;
    height: calc(100vh - 140px);
    min-height: 620px;
    background: #090d16;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    overflow: hidden;
    user-select: none;
    display: flex;
    flex-direction: column;
}

/* Control Bar at top of workspace */
.qc-erd-toolbar {
    position: relative;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: #111726;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    box-sizing: border-box;
}

.qc-erd-toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.qc-erd-toolbar-divider {
    width: 1px;
    height: 22px;
    background: rgba(255, 255, 255, 0.12);
}

.qc-erd-btn {
    background: #1b2438;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #f8fafc;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.18s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.qc-erd-btn:hover {
    background: var(--qc-primary);
    color: #ffffff;
    border-color: var(--qc-primary);
    transform: translateY(-1px);
}

#qc-erd-auto-layout {
    background: rgba(37, 99, 235, 0.2);
    border-color: rgba(37, 99, 235, 0.4);
    color: #60a5fa;
}
#qc-erd-auto-layout:hover {
    background: var(--qc-primary);
    color: #ffffff;
}

.qc-erd-zoom-level {
    font-size: 0.82rem;
    font-weight: 700;
    font-family: var(--qc-font-mono);
    color: #94a3b8;
    min-width: 48px;
    text-align: center;
}

.qc-erd-search {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #090d16;
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.14);
}

.qc-erd-search-icon {
    font-size: 0.85rem;
}

.qc-erd-search input {
    background: transparent;
    border: none;
    outline: none;
    color: #f8fafc;
    font-size: 0.82rem;
    width: 140px;
}

.qc-erd-search input::placeholder {
    color: #64748b;
}

/* Legend Overlay */
.qc-erd-legend {
    position: absolute;
    top: 12px;
    left: 16px;
    z-index: 100;
    width: 270px;
    background: #111726;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6);
    padding: 14px 18px;
    backdrop-filter: blur(12px);
}

.qc-erd-legend-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.qc-erd-legend-close {
    background: none;
    border: none;
    color: #94a3b8;
    cursor: pointer;
    font-size: 1rem;
}

.qc-erd-legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.8rem;
    color: #cbd5e1;
    margin-bottom: 8px;
}

.qc-erd-line-sample {
    width: 28px;
    height: 3px;
    border-radius: 2px;
}
.qc-erd-line-11 { background: #38bdf8; }
.qc-erd-line-1n { background: #2563eb; }

.qc-erd-legend-bridge {
    background: rgba(168, 85, 247, 0.25);
    color: #c084fc;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 800;
    font-size: 0.7rem;
}

.qc-erd-legend-tip {
    font-size: 0.74rem;
    color: #64748b;
    margin-top: 12px;
    line-height: 1.4;
}

/* Interactive Viewport Canvas */
.qc-erd-viewport {
    width: 100%;
    height: 100%;
    overflow: hidden;
    cursor: grab;
    background-color: #090d16;
    background-image: radial-gradient(rgba(255, 255, 255, 0.14) 1.2px, transparent 1.2px);
    background-size: 24px 24px;
}

.qc-erd-canvas {
    position: absolute;
    width: 3500px;
    height: 3500px;
    transform-origin: 0 0;
    transition: transform 0.05s ease-out;
}

/* SVG Overlay for Connections */
.qc-erd-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.qc-erd-rel-group {
    pointer-events: auto;
    cursor: pointer;
}

.qc-erd-line {
    fill: none;
    stroke: #2563eb;
    stroke-width: 2.5px;
    transition: stroke 0.2s ease, stroke-width 0.2s ease;
    opacity: 0.9;
}

.qc-erd-line.is-11 { stroke: #38bdf8; }
.qc-erd-line.is-1n { stroke: #2563eb; }

.qc-erd-line.is-active,
.qc-erd-rel-group:hover .qc-erd-line {
    stroke: #38bdf8 !important;
    stroke-width: 3.8px !important;
    opacity: 1 !important;
    filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.8));
}

.qc-erd-rel-group.is-dimmed-rel {
    opacity: 0.12;
}

/* Cardinality Badge Tags on Lines */
.qc-erd-cardinality-tag {
    background: #0f172a;
    border: 1.5px solid #2563eb;
    color: #60a5fa;
    font-size: 0.68rem;
    font-weight: 800;
    font-family: var(--qc-font-mono);
    padding: 2px 6px;
    border-radius: 6px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    pointer-events: none;
}
.qc-erd-cardinality-tag.tag-11 { border-color: #38bdf8; color: #38bdf8; }
.qc-erd-cardinality-tag.tag-1n { border-color: #2563eb; color: #60a5fa; }

/* Table Cards */
.qc-erd-tables {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20;
}

.qc-erd-card {
    position: absolute;
    width: 270px;
    background: #101625;
    border: 1.5px solid rgba(255, 255, 255, 0.14);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
    overflow: hidden;
    transition: box-shadow 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

.qc-erd-card:hover {
    border-color: #3b82f6;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.6), 0 0 14px rgba(59, 130, 246, 0.3);
    z-index: 30;
}

.qc-erd-card.is-active-node {
    border-color: #38bdf8 !important;
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.7), 0 0 20px rgba(56, 189, 248, 0.5) !important;
    z-index: 40;
}

.qc-erd-card.is-dimmed {
    opacity: 0.22;
}

.qc-erd-card.is-dragging {
    opacity: 0.92;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.75) !important;
    z-index: 100;
    cursor: grabbing !important;
}

.qc-erd-card.is-junction {
    border-color: rgba(168, 85, 247, 0.45);
}

/* Card Header */
.qc-erd-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    background: #151c2e;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    cursor: grab;
}

.qc-erd-card-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.92rem;
}

.qc-erd-table-name {
    color: #ffffff;
    word-break: break-all;
}

.qc-erd-junction-badge {
    background: rgba(168, 85, 247, 0.25);
    color: #c084fc;
    font-size: 0.65rem;
    font-weight: 800;
    padding: 2px 5px;
    border-radius: 4px;
}

.qc-erd-card-actions {
    display: flex;
    gap: 4px;
}

.qc-erd-card-btn {
    background: transparent;
    border: none;
    color: #94a3b8;
    font-size: 0.8rem;
    padding: 3px 5px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}
.qc-erd-card-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #38bdf8;
}

.qc-erd-card-meta {
    padding: 6px 14px;
    background: #090d16;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.74rem;
    color: #64748b;
    font-family: var(--qc-font-mono);
}

/* Card Column List */
.qc-erd-card-columns {
    padding: 6px 0;
    max-height: 320px;
    overflow-y: auto;
}

.qc-erd-col-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 14px;
    font-size: 0.82rem;
    transition: background 0.15s ease;
}

.qc-erd-col-row:hover {
    background: rgba(255, 255, 255, 0.05);
}

.qc-erd-col-left {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow: hidden;
}

.qc-erd-col-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: #64748b;
    opacity: 0.7;
}

.qc-erd-col-name {
    font-family: var(--qc-font-mono);
    color: #f1f5f9;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.qc-erd-col-row.is-pk .qc-erd-col-name {
    font-weight: 700;
    color: #facc15;
}

.qc-erd-col-row.is-fk .qc-erd-col-name {
    color: #38bdf8;
    font-weight: 600;
}

.qc-erd-col-right {
    font-size: 0.74rem;
    font-family: var(--qc-font-mono);
    color: #94a3b8;
    text-transform: uppercase;
}

/* Slide-over Table Detail Drawer */
.qc-erd-drawer {
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    max-width: 90%;
    height: 100%;
    background: #111726;
    border-left: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7);
    z-index: 200;
    display: flex;
    flex-direction: column;
    animation: slideInRight 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInRight {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

.qc-erd-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.qc-erd-drawer-close {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #94a3b8;
    cursor: pointer;
}

.qc-erd-drawer-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

.qc-erd-drawer-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.qc-erd-stat {
    background: #090d16;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
}

.qc-erd-stat strong {
    font-size: 1.3rem;
    color: #38bdf8;
}

.qc-erd-stat span {
    font-size: 0.75rem;
    color: #64748b;
}

.qc-erd-drawer-actions {
    margin-bottom: 20px;
}

.qc-erd-drawer-table-wrapper {
    overflow-x: auto;
    margin-top: 12px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
}

.qc-erd-detail-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.qc-erd-detail-table th,
.qc-erd-detail-table td {
    padding: 9px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    text-align: left;
}

.qc-erd-detail-table th {
    background: #090d16;
    color: #94a3b8;
    font-size: 0.72rem;
    text-transform: uppercase;
}