:root {
    --bg-color: #0d1117;
    --panel-bg: rgba(33, 38, 45, 0.85); /* Increased opacity for clarity */
    --panel-border: rgba(255, 255, 255, 0.18); /* Sharper definition */
    --text-primary: #f0f6fc;
    --text-muted: #afb8c1; /* Brightened for readability */
    --accent-color: #58a6ff;
    --accent-hover: #1f6feb;
    --input-bg: rgba(1, 4, 9, 0.8);
    --input-border: rgba(48, 54, 61, 1);
    --terminal-bg: #010409;
    --terminal-text: #e6edf3;
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    --glass-blur: blur(20px);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    overflow: hidden;
}

/* Dynamic Background */
.app-background {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 10% 10%, rgba(88, 166, 255, 0.15), transparent 45%),
                radial-gradient(circle at 90% 90%, rgba(63, 185, 80, 0.1), transparent 45%),
                #0d1117;
    z-index: -1;
    pointer-events: none;
}

.app-container {
    display: flex;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem;
    gap: 1.5rem;
    height: 100vh;
}

/* Glass Panels */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Sidebar */
.sidebar {
    width: 320px;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    overflow-y: auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--panel-border);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-color), #8a2be2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.4);
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.brand .subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.section-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

/* Scenario List (Radio Cards) */
.scenario-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.scenario-card {
    position: relative;
    cursor: pointer;
}

.scenario-card input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.scenario-card .card-content {
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.scenario-card .card-content::before {
    content: '';
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    transition: all 0.2s;
}

.scenario-card:hover .card-content {
    border-color: rgba(88, 166, 255, 0.5);
    transform: translateY(-2px);
}

.scenario-card input[type="radio"]:checked + .card-content {
    background: rgba(88, 166, 255, 0.1);
    border-color: var(--accent-color);
}

.scenario-card input[type="radio"]:checked + .card-content::before {
    border-color: var(--accent-color);
    background-color: var(--accent-color);
    box-shadow: 0 0 0 2px var(--input-bg), 0 0 0 4px var(--accent-color);
}

.card-title {
    font-weight: 500;
    font-size: 0.95rem;
    text-transform: capitalize;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Controls Panel */
.controls {
    padding: 1.5rem;
}

.panel-header {
    margin-bottom: 1.5rem;
    transition: margin-bottom 0.3s;
}

.controls.collapsed .panel-header {
    margin-bottom: 0;
}

.toggle-icon {
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    color: var(--accent-color); /* Highlight color */
    background: rgba(88, 166, 255, 0.1);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(88, 166, 255, 0.2);
}

.toggle-icon svg {
    width: 24px;
    height: 24px;
}

.toggle-icon:hover {
    background: rgba(88, 166, 255, 0.2);
    transform: scale(1.1);
}

.controls.collapsed .toggle-icon {
    transform: rotate(-180deg);
}

.card-body {
    max-height: 1000px;
    opacity: 1;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1), 
                opacity 0.3s ease,
                transform 0.3s ease;
    transform-origin: top;
}

.controls.collapsed .card-body {
    max-height: 0;
    opacity: 0;
    transform: scaleY(0.95);
    pointer-events: none;
}

.panel-header h2 {
    font-size: 1.15rem;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.full-width {
    grid-column: 1 / -1;
}

/* Form Inputs */
.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600; /* Increased weight */
    margin-bottom: 0.5rem;
    color: var(--text-primary); /* Use primary text color for labels */
}

.input-wrapper, .select-wrapper {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
}

.input-wrapper::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: var(--accent-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.input-wrapper:focus-within::after {
    transform: scaleX(1);
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    border-color: var(--text-muted);
}

select {
    appearance: none;
    -webkit-appearance: none;
}

.select-wrapper::before {
    content: '▼';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    color: var(--text-muted);
    pointer-events: none;
}

/* Toggles */
.toggle-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 1rem;
    border-radius: 8px;
}

.toggle-group label {
    margin-bottom: 0;
    color: var(--text-primary);
}

.toggle-text .helper {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-muted);
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    background-color: white;
    transform: translateX(20px);
}

.slider.round { border-radius: 24px; }
.slider.round:before { border-radius: 50%; }

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary {
    background: linear-gradient(135deg, #1f6feb, #238636);
    background-size: 200% auto;
    color: white;
    box-shadow: 0 4px 14px rgba(31, 111, 235, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(31, 111, 235, 0.5);
    background-position: right center;
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    background: #21262d;
    color: #484f58;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
}

/* Terminal */
.terminal {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--terminal-bg);
    overflow: hidden;
}

.terminal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid var(--input-border);
}

.window-controls {
    display: flex;
    gap: 6px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.red { background: #ff5f56; }
.yellow { background: #ffbd2e; }
.green { background: #27c93f; }

.terminal-title {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.icon-btn:hover {
    color: var(--text-primary);
}

.terminal-body {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    font-family: 'JetBrains Mono', Consolas, monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-all;
}

.log-line {
    margin-bottom: 0.2rem;
    animation: fadeIn 0.1s ease-in;
}

.log-line.system { color: var(--text-muted); }
.log-line.info { color: var(--accent-color); }
.log-line.warn { color: var(--warning); }
.log-line.error { color: var(--danger); font-weight: bold; }
.log-line.success { color: var(--success); font-weight: 600; }
.log-line.frame-log { color: #818cf8; font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; opacity: 0.9; }

/* Progress Bar Styling */
#sim-progress-container {
    border-bottom: 1px solid var(--panel-border) !important;
    animation: slideDown 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

#sim-progress-fill {
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    background: linear-gradient(90deg, #3b82f6, #2dd4bf) !important;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loader Spinner */
.loader-spinner {
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top: 3px solid white;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(2px); } to { opacity: 1; transform: translateY(0); } }

/* Initial Animations */
.pop-in {
    animation: popIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.slide-up {
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes popIn {
    0% { opacity: 0; transform: scale(0.98); }
    100% { opacity: 1; transform: scale(1); }
}

@keyframes slideUp {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* Simulator Status Card */
.status-card {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 1rem;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-danger {
    background: linear-gradient(135deg, #f85149, #b31d28);
    color: white;
}

.btn-danger:hover {
    box-shadow: 0 4px 14px rgba(248, 81, 73, 0.4);
    transform: translateY(-2px);
}

.btn-danger:active {
    transform: translateY(0);
}

.btn-danger:disabled {
    background: #6e2a2a;
    color: #a0aec0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

/* Idle Toggle CSS */
.idle-toggle-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.idle-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.small-switch {
    width: 34px;
    height: 18px;
}

.small-switch .slider:before {
    height: 12px;
    width: 12px;
    bottom: 3px;
    left: 3px;
}

.small-switch input:checked + .slider:before {
    transform: translateX(16px);
}