/* ==========================================================================
   DOPPLER EFFECT VIRTUAL LABORATORY STYLESHEET
   Virtual Instrumentation Labs
   ========================================================================== */

:root {
    --bg-base: #080c14;
    --bg-surface: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #26354a;
    --bg-input: #090d16;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(6, 182, 212, 0.3);
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --primary: #06b6d4;
    --primary-hover: #0891b2;
    --primary-glow: rgba(6, 182, 212, 0.25);
    
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #f43f5e;
    --danger-bg: rgba(244, 63, 94, 0.12);
    
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.2);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Main Container Layout */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
.lab-header {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem 1.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-card);
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    padding: 0.2rem 0.65rem;
    border-radius: 20px;
    width: fit-content;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lab-title {
    font-family: var(--font-heading);
    font-size: 1.85rem;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.lab-subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.status-pill-group {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.status-pill {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-dim);
}

.status-pill.approaching {
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
}
.status-pill.approaching .status-dot {
    background-color: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.status-pill.receding {
    border-color: rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}
.status-pill.receding .status-dot {
    background-color: var(--warning);
    box-shadow: 0 0 8px var(--warning);
}

.shift-pill.shift-up {
    border-color: rgba(6, 182, 212, 0.4);
    background: rgba(6, 182, 212, 0.1);
    color: var(--primary);
}

.shift-pill.shift-down {
    border-color: rgba(244, 63, 94, 0.4);
    background: rgba(244, 63, 94, 0.1);
    color: var(--danger);
}

/* Workspace Layout Grid */
.lab-workspace {
    display: grid;
    grid-template-columns: 1fr 480px;
    gap: 1.5rem;
}

@media (max-width: 1200px) {
    .lab-workspace {
        grid-template-columns: 1fr;
    }
}

.simulation-section, .readout-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Cards Base */
.canvas-card, .modes-card, .controls-card, .dashboard-card, 
.verification-card, .graphs-card, .table-card, .procedure-card, .theory-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 1rem 1.25rem;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.card-icon {
    font-size: 1.2rem;
}

.card-title h2 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffffff;
}

/* Buttons System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.55rem 1rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #000000;
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(6, 182, 212, 0.35);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-main);
    border-color: var(--border-color);
}
.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}
.btn-accent:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
}

.btn-warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.3);
}
.btn-warning:hover {
    background: rgba(245, 158, 11, 0.25);
}

.btn-danger {
    background: rgba(244, 63, 94, 0.15);
    color: var(--danger);
    border-color: rgba(244, 63, 94, 0.3);
}
.btn-danger:hover {
    background: rgba(244, 63, 94, 0.25);
}

.btn-utility {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-muted);
    border-color: var(--border-color);
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}
.btn-utility:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}
.btn-utility.btn-active {
    background: rgba(6, 182, 212, 0.15);
    color: var(--primary);
    border-color: rgba(6, 182, 212, 0.4);
}

.btn-audio {
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    border-color: rgba(99, 102, 241, 0.3);
}
.btn-audio.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

/* Hero Canvas Viewport */
.canvas-viewport {
    position: relative;
    width: 100%;
    height: 420px;
    background: #04070d;
    overflow: hidden;
}

#simCanvas {
    display: block;
    width: 100%;
    height: 100%;
}

.canvas-overlay-warning {
    position: absolute;
    top: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(244, 63, 94, 0.95);
    color: #ffffff;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
    box-shadow: 0 4px 15px rgba(244, 63, 94, 0.4);
    display: none;
    z-index: 10;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.85; transform: translateX(-50%) scale(1.02); }
}

/* Canvas Control Toolbar */
.canvas-toolbar {
    padding: 1rem 1.25rem;
    background: rgba(15, 23, 42, 0.9);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.motion-btn-group, .playback-btn-group {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

/* Experiment Modes Presets */
.modes-card {
    padding: 0.9rem 1.25rem;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
}

.modes-label {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.mode-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    width: 100%;
}

.mode-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.6rem 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.mode-btn:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

.mode-btn.active {
    background: rgba(6, 182, 212, 0.12);
    border-color: var(--primary);
    box-shadow: 0 0 12px rgba(6, 182, 212, 0.15);
}

.mode-num {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
}

.mode-desc {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
}

/* Controls Grid */
.controls-card {
    padding: 1.25rem;
}

.controls-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem 1.75rem;
}

@media (max-width: 768px) {
    .controls-grid {
        grid-template-columns: 1fr;
    }
    .mode-buttons {
        grid-template-columns: 1fr 1fr;
    }
    .modes-card {
        flex-direction: column;
        align-items: flex-start;
    }
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

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

.control-label-row label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.input-with-unit {
    display: flex;
    align-items: center;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.15rem 0.5rem;
}

.input-with-unit input[type="number"] {
    width: 65px;
    background: transparent;
    border: none;
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 600;
    text-align: right;
    outline: none;
}

/* Hide spin buttons */
.input-with-unit input[type="number"]::-webkit-inner-spin-button,
.input-with-unit input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.input-with-unit .unit {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-left: 0.3rem;
    font-family: var(--font-mono);
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    outline: none;
    margin-top: 0.3rem;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
}

/* Dashboard Readout Cards */
.metrics-grid {
    padding: 1.25rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.metric-card.hero-metric {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(30, 41, 59, 0.9));
    border-color: rgba(6, 182, 212, 0.3);
}

.metric-label {
    font-size: 0.775rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value-wrap {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
}

.hero-metric .metric-value {
    font-size: 2.25rem;
    color: var(--primary);
    text-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

.metric-unit {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-dim);
}

.metric-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Verification Panel */
.verification-card {
    padding: 1.25rem;
    gap: 0.75rem;
}

.verification-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.verification-badge.verified {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.4);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
}

.verification-details {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.85rem 1rem;
}

.verif-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.825rem;
}

.verif-label {
    color: var(--text-muted);
}

.verif-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-main);
}

/* Graphs Section */
.graphs-card {
    padding: 1.25rem;
    gap: 0.75rem;
}

.graph-tabs {
    display: flex;
    gap: 0.4rem;
    background: var(--bg-input);
    padding: 0.2rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.graph-tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.3rem 0.75rem;
    font-size: 0.775rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.graph-tab-btn.active {
    background: var(--primary);
    color: #000000;
}

.graph-viewport {
    width: 100%;
    height: 220px;
    background: #04070d;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

#graphCanvas {
    display: block;
    width: 100%;
    height: 100%;
}

.graph-caption {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Table Section */
.table-card {
    padding: 1.25rem;
    gap: 1rem;
}

.table-actions {
    display: flex;
    gap: 0.5rem;
}

.table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    max-height: 260px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
    text-align: left;
}

th {
    background: var(--bg-card);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-weight: 600;
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    white-space: nowrap;
}

td {
    padding: 0.6rem 0.85rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    font-family: var(--font-mono);
    color: var(--text-main);
    white-space: nowrap;
}

tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.015);
}

tr:hover {
    background: rgba(6, 182, 212, 0.05);
}

/* Guided Lab Procedure */
.procedure-card {
    padding: 1.25rem;
}

.procedure-list {
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.procedure-list li label {
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.procedure-list input[type="checkbox"] {
    accent-color: var(--primary);
    margin-top: 0.2rem;
}

/* Theory & Reference */
.theory-card {
    padding: 1.25rem;
}

.theory-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.theory-content h3, .theory-content h4 {
    color: #ffffff;
    font-family: var(--font-heading);
}

.formula-box {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--primary);
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--primary);
    text-align: center;
}

.theory-content ul {
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

/* Footer */
.lab-footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-dim);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
    margin-top: 1rem;
}

/* --- LIGHT THEME SPECIFIC OVERRIDES --- */
html[data-theme="light"] body,
html:not(.dark) body {
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-input: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-dim: #64748b;
    --shadow-card: 0 4px 15px rgba(0, 0, 0, 0.05);
}

html[data-theme="light"] .lab-header,
html:not(.dark) .lab-header {
    background: #ffffff;
    border-color: #e2e8f0;
}

html[data-theme="light"] .lab-title,
html:not(.dark) .lab-title,
html[data-theme="light"] .card-title h2,
html:not(.dark) .card-title h2,
html[data-theme="light"] .metric-value,
html:not(.dark) .metric-value,
html[data-theme="light"] .theory-content h3,
html:not(.dark) .theory-content h3,
html[data-theme="light"] .theory-content h4,
html:not(.dark) .theory-content h4,
html[data-theme="light"] .verif-value,
html:not(.dark) .verif-value,
html[data-theme="light"] .mode-desc,
html:not(.dark) .mode-desc {
    color: #0f172a !important;
}

html[data-theme="light"] .canvas-viewport,
html:not(.dark) .canvas-viewport,
html[data-theme="light"] .graph-viewport,
html:not(.dark) .graph-viewport {
    background: #ffffff;
    border-color: #cbd5e1;
}

html[data-theme="light"] .canvas-toolbar,
html:not(.dark) .canvas-toolbar {
    background: #f8fafc;
    border-color: #e2e8f0;
}

html[data-theme="light"] .metric-card.hero-metric,
html:not(.dark) .metric-card.hero-metric {
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(241, 245, 249, 0.95));
    border-color: rgba(6, 182, 212, 0.3);
}

html[data-theme="light"] .metric-card,
html:not(.dark) .metric-card {
    background: #ffffff;
    border-color: #e2e8f0;
}

html[data-theme="light"] .card-header,
html:not(.dark) .card-header {
    background: #f8fafc;
    border-color: #e2e8f0;
}

html[data-theme="light"] .status-pill,
html:not(.dark) .status-pill,
html[data-theme="light"] .verification-details,
html:not(.dark) .verification-details,
html[data-theme="light"] .graph-tabs,
html:not(.dark) .graph-tabs,
html[data-theme="light"] .formula-box,
html:not(.dark) .formula-box {
    background: #f8fafc;
    border-color: #e2e8f0;
}

html[data-theme="light"] th,
html:not(.dark) th {
    background: #f1f5f9;
    color: #475569;
    border-bottom-color: #cbd5e1;
}

html[data-theme="light"] tr:nth-child(even),
html:not(.dark) tr:nth-child(even) {
    background: #f8fafc;
}

html[data-theme="light"] td,
html:not(.dark) td {
    border-bottom-color: #e2e8f0;
    color: #0f172a;
}