/* ============================================
   CIRCUIT SIMULATOR - MAIN STYLESHEET
   Futuristic Dark Theme with Neon Accents
   ============================================ */

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2235;
    --bg-card: #151d2e;
    --border-color: #1e2d45;
    --border-glow: #00e5ff33;
    --text-primary: #e8eaed;
    --text-secondary: #8b95a5;
    --text-muted: #5a6577;
    --accent-cyan: #00e5ff;
    --accent-orange: #ff9100;
    --accent-green: #76ff03;
    --accent-pink: #ff4081;
    --accent-yellow: #ffd740;
    --accent-purple: #b388ff;
    --danger: #ff1744;
    --grid-color: #1a2540;
    --grid-dot: #253552;
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow-cyan: 0 0 20px rgba(0,229,255,0.3);
    --shadow-glow-orange: 0 0 15px rgba(255,145,0,0.3);
    --shadow-glow-green: 0 0 15px rgba(118,255,3,0.3);
    --shadow-glow-pink: 0 0 15px rgba(255,64,129,0.3);
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --sidebar-width: 220px;
    --topbar-height: 52px;
    --grid-size: 20;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }

/* ---- APP LAYOUT ---- */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* ---- TOP BAR ---- */
#top-bar {
    height: var(--topbar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 100;
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    font-size: 24px;
    filter: drop-shadow(0 0 8px rgba(0,229,255,0.6));
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 0 8px rgba(0,229,255,0.4)); }
    50% { filter: drop-shadow(0 0 16px rgba(0,229,255,0.8)); }
}

.logo-text {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--text-secondary);
}

.logo-highlight {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0,229,255,0.5);
}

.toolbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toolbar-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.toolbar-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0,229,255,0.08);
}

.toolbar-btn.danger:hover {
    border-color: var(--danger);
    color: var(--danger);
    background: rgba(255,23,68,0.08);
}

.toolbar-separator {
    width: 1px;
    height: 28px;
    background: var(--border-color);
    margin: 0 6px;
}

.sim-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--bg-tertiary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 8px rgba(118,255,3,0.6);
    animation: status-blink 2s ease-in-out infinite;
}

@keyframes status-blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.sim-status.error .status-dot {
    background: var(--danger);
    box-shadow: 0 0 8px rgba(255,23,68,0.6);
}

.status-text {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ---- MAIN CONTENT ---- */
#main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ---- LEFT SIDEBAR ---- */
#component-palette {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex-shrink: 0;
}

.palette-title {
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-muted);
    padding: 16px 16px 8px;
    border-bottom: 1px solid var(--border-color);
}

.palette-section {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.component-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    margin-bottom: 4px;
}

.component-item:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

.component-item:active {
    cursor: grabbing;
    transform: scale(0.97);
}

.component-item.active {
    background: rgba(0,229,255,0.1);
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow-cyan);
}

.component-item[data-type="wire"].active {
    background: rgba(255,215,64,0.1);
    border-color: var(--accent-yellow);
}

.component-icon {
    width: 60px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.component-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.palette-help {
    padding: 16px;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.palette-help p {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 6px;
    line-height: 1.5;
}

.palette-help strong {
    color: var(--text-secondary);
}

/* ---- CANVAS ---- */
#canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
}

#circuit-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: default;
}

#circuit-canvas.wire-mode {
    cursor: crosshair;
}

#circuit-canvas.dragging {
    cursor: grabbing;
}

/* ---- RIGHT SIDEBAR ---- */
#properties-panel {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex-shrink: 0;
}

#props-content {
    padding: 12px;
    flex: 1;
}

.no-selection {
    text-align: center;
    padding: 30px 16px;
    color: var(--text-muted);
}

.no-selection-icon {
    font-size: 40px;
    margin-bottom: 12px;
    opacity: 0.3;
}

.no-selection p {
    font-size: 13px;
    line-height: 1.6;
}

/* Property fields */
.prop-group {
    margin-bottom: 16px;
}

.prop-group-title {
    font-family: var(--font-display);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-color);
}

.prop-field {
    margin-bottom: 10px;
}

.prop-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
    display: block;
}

.prop-input {
    width: 100%;
    padding: 8px 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    transition: all 0.2s ease;
}

.prop-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 2px rgba(0,229,255,0.15);
}

.prop-input-group {
    display: flex;
    align-items: center;
    gap: 0;
}

.prop-input-group .prop-input {
    border-radius: 6px 0 0 6px;
}

.prop-unit {
    padding: 8px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 6px 6px 0;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
    white-space: nowrap;
}

.prop-slider {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--bg-primary);
    outline: none;
    margin: 8px 0;
}

.prop-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(0,229,255,0.5);
}

.prop-value-display {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 600;
    text-align: center;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.prop-value-display.voltage {
    color: var(--accent-cyan);
    text-shadow: 0 0 10px rgba(0,229,255,0.4);
}

.prop-value-display.resistance {
    color: var(--accent-orange);
    text-shadow: 0 0 10px rgba(255,145,0,0.4);
}

.prop-value-display.voltmeter {
    color: var(--accent-green);
    text-shadow: 0 0 10px rgba(118,255,3,0.4);
}

.prop-value-display.ammeter {
    color: var(--accent-pink);
    text-shadow: 0 0 10px rgba(255,64,129,0.4);
}

.prop-btn {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s ease;
    margin-top: 6px;
}

.prop-btn:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.prop-btn.danger {
    color: var(--danger);
    border-color: rgba(255,23,68,0.3);
}

.prop-btn.danger:hover {
    background: rgba(255,23,68,0.1);
    border-color: var(--danger);
}

.prop-btn.rotate-btn:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

/* ---- MEASUREMENTS ---- */
#measurements-panel {
    border-top: 1px solid var(--border-color);
}

#measurements-content {
    padding: 12px;
}

.measurement-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
    transition: border-color 0.2s;
}

.measurement-item:hover {
    border-color: var(--border-glow);
}

.measurement-item .meas-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.measurement-item .meas-value {
    font-family: var(--font-mono);
    font-size: 16px;
    font-weight: 600;
}

.measurement-item.volt .meas-value {
    color: var(--accent-green);
    text-shadow: 0 0 6px rgba(118,255,3,0.4);
}

.measurement-item.amp .meas-value {
    color: var(--accent-pink);
    text-shadow: 0 0 6px rgba(255,64,129,0.4);
}

/* ---- TOOLTIP ---- */
.canvas-tooltip {
    position: absolute;
    pointer-events: none;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 10px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.15s;
}

.canvas-tooltip.visible {
    opacity: 1;
}

/* ---- ANIMATIONS ---- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.prop-group {
    animation: fadeIn 0.2s ease-out;
}

/* Drag ghost */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.8;
    transform: scale(1.1);
    filter: drop-shadow(0 0 12px rgba(0,229,255,0.5));
}

/* Responsive */
@media (max-width: 900px) {
    :root {
        --sidebar-width: 180px;
    }
}

@media (max-width: 700px) {
    #properties-panel {
        display: none;
    }
}
/* ---- FLOW MODE TOGGLE ---- */
.flow-toggle {
    position: relative;
    padding: 6px 16px !important;
    border: 1px solid var(--accent-cyan) !important;
    background: rgba(0,229,255,0.08) !important;
    color: var(--accent-cyan) !important;
    font-weight: 600 !important;
    transition: all 0.3s ease !important;
}

.flow-toggle .flow-icon {
    font-size: 14px;
}

.flow-toggle .flow-label {
    font-size: 12px;
    letter-spacing: 0.5px;
}

.flow-toggle:hover {
    background: rgba(0,229,255,0.15) !important;
    box-shadow: 0 0 12px rgba(0,229,255,0.3);
}

.flow-toggle.electron {
    border-color: #aeea00 !important;
    background: rgba(174,234,0,0.08) !important;
    color: #ccff00 !important;
}

.flow-toggle.electron:hover {
    background: rgba(174,234,0,0.15) !important;
    box-shadow: 0 0 12px rgba(174,234,0,0.3);
}

/* ============================================
   LIGHT THEME
   ============================================ */
[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8ecf1;
    --bg-card: #ffffff;
    --border-color: #d1d9e6;
    --border-glow: rgba(0,120,200,0.15);
    --text-primary: #1a2233;
    --text-secondary: #4a5568;
    --text-muted: #8a95a5;
    --grid-color: #e2e8f0;
    --grid-dot: #cbd5e0;
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
}

[data-theme="light"] #top-bar {
    background: #ffffff;
    border-bottom: 1px solid #d1d9e6;
}

[data-theme="light"] .toolbar-btn {
    color: #4a5568;
}

[data-theme="light"] .toolbar-btn:hover {
    background: rgba(0,0,0,0.06);
}

[data-theme="light"] #component-palette,
[data-theme="light"] #properties-panel {
    background: #ffffff;
    border-color: #d1d9e6;
}

[data-theme="light"] .component-item {
    background: #f7fafc;
    border-color: #e2e8f0;
}

[data-theme="light"] .component-item:hover {
    background: #edf2f7;
    border-color: #cbd5e0;
}

[data-theme="light"] canvas {
    background: #f0f4f8 !important;
}

/* ============================================
   LANGUAGE SELECTOR
   ============================================ */
.lang-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 12px;
    padding: 4px 8px;
    border-radius: 6px;
    cursor: pointer;
    outline: none;
    appearance: auto;
}

.lang-select:hover {
    border-color: var(--accent-cyan);
}

/* ============================================
   TOOLBAR ACTIVE STATES
   ============================================ */
.toolbar-btn.active {
    background: rgba(0,229,255,0.15) !important;
    border-color: var(--accent-cyan) !important;
    color: var(--accent-cyan) !important;
    box-shadow: 0 0 8px rgba(0,229,255,0.2);
}

/* ============================================
   MODAL STYLES
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    max-width: 720px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalIn 0.25s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-family: var(--font-display);
    font-size: 18px;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
}

.modal-close:hover {
    background: rgba(255,23,68,0.1);
    color: var(--danger);
}

.modal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    padding: 20px 24px;
}

.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.modal-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow-cyan);
    transform: translateY(-2px);
}

.modal-card.completed {
    border-color: var(--accent-green);
    background: rgba(118,255,3,0.05);
}

.modal-card-icon {
    font-size: 32px;
    margin-bottom: 8px;
}

.modal-card-title {
    font-family: var(--font-display);
    font-size: 13px;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.modal-card-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 8px;
}

.modal-card-diff {
    font-size: 12px;
    color: var(--accent-yellow);
}

/* ============================================
   ANALYSIS TABS & PANEL
   ============================================ */
#analysis-section {
    margin-top: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}

.analysis-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
    padding: 0 12px;
}

.analysis-tab {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 11px;
    font-weight: 600;
    padding: 6px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.analysis-tab.active {
    background: rgba(0,229,255,0.1);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.analysis-tab:hover:not(.active) {
    background: rgba(255,255,255,0.05);
}

#analysis-content {
    padding: 0 12px 12px;
    max-height: 300px;
    overflow-y: auto;
    font-size: 13px;
}

/* ============================================
   FORMULA CARDS
   ============================================ */
.formula-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
}

.formula-card h4 {
    font-family: var(--font-display);
    font-size: 11px;
    color: var(--accent-cyan);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.formula-section {
    margin-bottom: 6px;
}

.formula-section .formula {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    padding: 6px 10px;
    border-radius: 4px;
    margin: 4px 0;
}

.formula-section .formula-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 2px;
}

/* ============================================
   TOPOLOGY GROUPS
   ============================================ */
.topo-group {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 6px;
    font-size: 12px;
}

.topo-type {
    font-family: var(--font-display);
    font-size: 10px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.topo-type.series {
    background: rgba(0,229,255,0.15);
    color: var(--accent-cyan);
}

.topo-type.parallel {
    background: rgba(255,145,0,0.15);
    color: var(--accent-orange);
}

.topo-ids {
    color: var(--text-secondary);
    flex: 1;
}

.topo-equiv {
    font-family: var(--font-mono);
    color: var(--accent-green);
    font-size: 11px;
}

/* ============================================
   STEP-BY-STEP ANALYSIS
   ============================================ */
.step-container {
    padding: 4px 0;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
}

.step-card h4 {
    font-family: var(--font-display);
    font-size: 11px;
    color: var(--accent-purple);
    margin-bottom: 8px;
}

.step-card p,
.step-card li {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.step-card ul {
    list-style: none;
    padding-left: 0;
}

.step-card li::before {
    content: '▸ ';
    color: var(--accent-cyan);
}

/* ============================================
   WARNING ITEMS
   ============================================ */
#warnings-content {
    padding: 0 12px;
}

.warning-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 6px;
    margin-bottom: 6px;
    font-size: 12px;
    line-height: 1.4;
}

.warning-item.error {
    background: rgba(255,23,68,0.1);
    border: 1px solid rgba(255,23,68,0.3);
    color: #ff6b8a;
}

.warning-item.warning {
    background: rgba(255,145,0,0.1);
    border: 1px solid rgba(255,145,0,0.3);
    color: #ffb74d;
}

.warning-item.info {
    background: rgba(0,229,255,0.08);
    border: 1px solid rgba(0,229,255,0.2);
    color: var(--accent-cyan);
}

.warning-icon {
    flex-shrink: 0;
    font-size: 14px;
}

/* ============================================
   CHALLENGE PANEL
   ============================================ */
#challenge-panel {
    position: absolute;
    top: 12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-secondary);
    border: 1px solid var(--accent-cyan);
    border-radius: 12px;
    padding: 16px 20px;
    max-width: 480px;
    width: 90%;
    z-index: 100;
    box-shadow: var(--shadow-glow-cyan);
    display: none;
}

#challenge-panel.active {
    display: block;
}

.challenge-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
}

.challenge-header h3 {
    font-family: var(--font-display);
    font-size: 14px;
    color: var(--accent-cyan);
}

.challenge-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}

.challenge-close:hover {
    color: var(--danger);
    background: rgba(255,23,68,0.1);
}

.challenge-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.5;
}

.challenge-hint {
    font-size: 12px;
    color: var(--accent-yellow);
    background: rgba(255,215,64,0.08);
    border: 1px solid rgba(255,215,64,0.2);
    border-radius: 6px;
    padding: 8px 12px;
    margin-bottom: 12px;
}

.challenge-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.challenge-result {
    font-size: 13px;
    padding: 8px 12px;
    border-radius: 6px;
    margin-top: 8px;
}

.challenge-result.pass {
    background: rgba(118,255,3,0.1);
    border: 1px solid rgba(118,255,3,0.3);
}

.challenge-pass {
    color: var(--accent-green);
    font-weight: 600;
}

.challenge-result.fail {
    background: rgba(255,23,68,0.1);
    border: 1px solid rgba(255,23,68,0.3);
}

.challenge-fail {
    color: #ff6b8a;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
#toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--accent-cyan);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    padding: 10px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-glow-cyan);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    pointer-events: auto;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    #top-bar, #component-palette, #properties-panel,
    .toolbar-actions, #challenge-panel, #toast-container,
    .modal {
        display: none !important;
    }

    #main-content {
        display: block !important;
    }

    #canvas-container {
        width: 100% !important;
        height: auto !important;
    }

    canvas {
        max-width: 100%;
        height: auto !important;
    }

    body {
        background: white !important;
    }
}

/* ============================================
   MOBILE / TOUCH FRIENDLY
   ============================================ */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 180px;
        --topbar-height: 48px;
    }

    .toolbar-btn span:not(.flow-icon):not(.flow-label) {
        display: none;
    }

    .toolbar-btn {
        padding: 6px 8px !important;
        min-width: 36px;
    }

    .toolbar-separator {
        margin: 0 4px;
    }

    #component-palette {
        width: var(--sidebar-width);
    }

    .component-item {
        padding: 6px;
    }

    .component-label {
        font-size: 11px;
    }

    .palette-help {
        display: none;
    }

    .lang-select {
        width: 48px;
    }
}

@media (max-width: 480px) {
    #component-palette {
        display: none;
    }

    #properties-panel {
        display: none;
    }

    #canvas-container {
        width: 100% !important;
    }
}