:root {
    --bg-main: #0b0f19;
    --bg-card: #131a26;
    --bg-editor: #1e2530;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-yellow: #f59e0b;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border: #262f3f;
    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

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

/* Loading Overlay */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-main);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease-out;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(99, 102, 241, 0.1);
    border-top: 5px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 24px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loading-text {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-main);
}

#loading-subtext {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Header */
header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: white;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(to right, #ffffff, #d1d5db);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

select,
button {
    background-color: var(--bg-editor);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 12px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    outline: none;
    transition: all 0.2s;
    cursor: pointer;
}

select:hover,
select:focus {
    border-color: var(--primary);
}

button.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    font-weight: 600;
    padding: 6px 16px;
}

button.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 9999px;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

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

/* Workspace Grid */
.workspace {
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: calc(100vh - 60px);
    background-color: var(--bg-main);
}

.panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    border-right: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.panel:last-child {
    border-right: none;
}

.panel-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 8px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 40px;
}

.panel-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

/* Editor Section */
#editor-container {
    flex-grow: 1;
    height: 0;
    min-height: 0;
    width: 100%;
    background-color: var(--bg-editor);
}

.slide-selector-wrapper {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.slide-selector-header {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slide-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.slide-tab {
    background-color: var(--bg-editor);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.slide-tab:hover {
    border-color: var(--primary);
    color: var(--text-main);
}

.slide-tab.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
    font-weight: 500;
}

/* Preview Section */
.preview-tabs {
    display: flex;
    gap: 4px;
}

.preview-tab {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.preview-tab.active {
    background-color: var(--bg-editor);
    color: var(--text-main);
}

.preview-body {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: auto;
    position: relative;
    background-image: radial-gradient(var(--border) 1px, transparent 1px);
    background-size: 16px 16px;
}

#svg-render-area {
    background-color: #ffffff;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    border-radius: 8px;
    max-width: 100%;
    max-height: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform-origin 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

#svg-render-area svg {
    display: block;
    width: 100%;
    height: auto;
}

/* Glassmorphic Presentation Subtitle Panel */
#narration-subtitle {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: #f3f4f6;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    max-width: 80%;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    z-index: 5;
    line-height: 1.4;
    transition: opacity 0.3s ease;
}

/* Glassmorphic Controller Floating Bar */
#presentation-controller {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 320px;
    background: rgba(19, 26, 38, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 10px 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: 8px;
    user-select: none;
    transition: opacity 0.3s ease;
}

.timeline-container {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    overflow: hidden;
}

#timeline-progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--primary), #a855f7);
    transition: width 0.3s ease;
}

.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.btn-ctrl {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 6px;
    color: #d1d5db;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-ctrl:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary);
    color: #ffffff;
}

#step-indicator {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-weight: 500;
}

/* Raw XML Textarea */
#xml-output-area {
    display: none;
    width: 100%;
    height: 100%;
    background-color: var(--bg-editor);
    border: none;
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 16px;
    resize: none;
    outline: none;
}

.preview-actions {
    display: flex;
    gap: 8px;
}

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    padding: 0;
}

/* Error Banner */
#error-banner {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(239, 68, 68, 0.95);
    color: white;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    max-height: 120px;
    overflow-y: auto;
    border-top: 1px solid var(--accent-red);
    display: none;
    z-index: 10;
}

/* ==========================================================================
   NEW: Interactive Assessment Sandbox & Telemetry Styles
   ========================================================================== */

#assessment-area {
    display: none;
    width: 100%;
    height: 100%;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    padding: 8px 4px;
}

.assessment-layout {
    display: grid;
    grid-template-rows: auto 1fr;
    gap: 20px;
    height: 100%;
}

/* Premium Card Design */
.assessment-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.assessment-badge-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.assessment-badge {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 6px;
    letter-spacing: 0.05em;
}

.badge-phase {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.badge-difficulty {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--accent-yellow);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.assessment-question {
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.5;
    color: var(--text-main);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Interactive Radio Card Option */
.option-card {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--bg-editor);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.option-card:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.04);
}

.option-card.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.15);
}

/* Styled radio indicator circles */
.option-circle {
    min-width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.option-card.selected .option-circle {
    border-color: var(--primary);
}

.option-circle-inner {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--primary);
    transform: scale(0);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.option-card.selected .option-circle-inner {
    transform: scale(1);
}

.option-key {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--primary);
    background: rgba(99, 102, 241, 0.12);
    border-radius: 4px;
    padding: 2px 6px;
    font-size: 0.85rem;
}

.option-text {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-main);
}

/* Submit Action Button */
.assessment-btn-submit {
    background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
    border: none;
    color: white;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    width: 100%;
    margin-top: 10px;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    transition: all 0.2s;
}

.assessment-btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.assessment-btn-submit:active {
    transform: translateY(1px);
}

/* Response Feedback Panel */
.assessment-feedback-panel {
    border-radius: 8px;
    padding: 16px;
    display: none;
    flex-direction: column;
    gap: 12px;
    animation: slideDown 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.assessment-feedback-panel.correct {
    background-color: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #a7f3d0;
}

.assessment-feedback-panel.incorrect {
    background-color: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fecaca;
}

.feedback-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 0.95rem;
}

.feedback-icon {
    width: 16px;
    height: 16px;
}

.solution-steps-box {
    margin-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 12px;
}

.solution-steps-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 600;
}

.solution-step {
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 8px;
    padding-left: 14px;
    position: relative;
    opacity: 0;
    transform: translateY(5px);
    animation: stepFadeIn 0.4s forwards;
}

.solution-step::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-green);
}

@keyframes stepFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Telemetry Event Console */
.telemetry-console {
    background: #060911;
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: inset 0 2px 10px rgba(0,0,0,0.8);
}

.console-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.console-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.console-badge {
    background: var(--primary);
    color: white;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.05em;
}

.console-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.console-btn-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.console-btn-clear:hover {
    color: white;
    background: rgba(255,255,255,0.06);
}

.console-body {
    flex-grow: 1;
    padding: 16px;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.telemetry-log-item {
    border-left: 3px solid var(--primary);
    background: rgba(99, 102, 241, 0.03);
    padding: 10px 14px;
    border-radius: 0 6px 6px 0;
    animation: logFadeIn 0.3s ease;
}

.log-meta {
    font-size: 0.725rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    display: flex;
    justify-content: space-between;
}

.log-event-type {
    font-weight: 600;
    color: #818cf8;
}

.log-json {
    white-space: pre-wrap;
    color: #34d399;
}

@keyframes logFadeIn {
    from {
        opacity: 0;
        transform: translateX(-4px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Empty State */
.assessment-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: 40px;
    gap: 16px;
}

.assessment-empty-icon {
    opacity: 0.25;
    color: var(--text-muted);
}

.assessment-empty-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
}

.assessment-empty-text {
    font-size: 0.875rem;
    line-height: 1.5;
    max-width: 320px;
}

/* Responsive Utilities */
@media (max-width: 800px) {
    .workspace {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
        height: calc(100vh - 60px);
    }

    .panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
}

.assessment-btn-hint {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-weight: 600;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.assessment-btn-hint:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary);
    color: white;
}

.assessment-btn-hint:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    border-color: var(--border);
    color: var(--text-muted);
}

/* Disabled Preview Tabs */
.preview-tab.disabled {
    opacity: 0.3;
    cursor: not-allowed !important;
    pointer-events: none;
}