:root {
    --bg: #020617;
    --panel: rgba(15, 23, 42, 0.75);
    --border: rgba(255, 255, 255, 0.08);
    --primary: #f59e0b;
    --secondary: #0ea5e9;
    --text: #f8fafc;
    --muted: #94a3b8;
}

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

body.sim-page {
    font-family: 'Outfit', sans-serif;
    color: var(--text);
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #020617;
    touch-action: none;
    overscroll-behavior: none;
}

#phet-stage {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
    transform-origin: top left;
}

.sim-nav {
    position: relative !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.65rem 1.5rem;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 200;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.sim-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #f1f5f9;
    font-size: 1.15rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.4rem;
    color: var(--primary);
}

.logo-thin {
    font-weight: 300;
}

.nav-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--muted);
}

.nav-breadcrumbs a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-breadcrumbs a:hover {
    color: var(--primary);
}

.nav-breadcrumbs .sep {
    font-weight: 300;
    color: #334155;
}

.nav-breadcrumbs .current {
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    color: #f1f5f9;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    border: 1px solid var(--border);
}

.nav-back:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    flex: 1;
}

.simulation-header {
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 15px;
}

.pulse-icon {
    font-size: 2rem;
    color: var(--primary);
    animation: glow-pulse 2s infinite ease-in-out;
}

@keyframes glow-pulse {
    0% { transform: scale(1); text-shadow: 0 0 10px rgba(245, 158, 11, 0.4); }
    50% { transform: scale(1.1); text-shadow: 0 0 25px var(--primary); }
    100% { transform: scale(1); text-shadow: 0 0 10px rgba(245, 158, 11, 0.4); }
}

.brand h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.highlight {
    color: var(--primary);
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.status-indicators {
    display: flex;
    gap: 30px;
}

.indicator {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.indicator .label {
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--text-muted);
    letter-spacing: 1px;
}

.indicator .value {
    color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
}

.simulation-stage {
    display: flex;
    flex: 1;
    position: relative;
    overflow: hidden;
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    background: radial-gradient(circle at center, #0f172a 0%, #020617 100%);
    touch-action: none;
}

#circuit-canvas {
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

.waveform-overlay {
    position: absolute;
    bottom: 20px;
    left: 20px;
    width: 280px;
    height: 140px;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    pointer-events: none;
}

#oscillosope-canvas {
    width: 100%;
    height: 100%;
    background: #000;
}

.control-panel {
    width: 330px;
    background: var(--panel);
    backdrop-filter: blur(16px);
    border-left: 1px solid var(--border);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    touch-action: pan-y;
}

.phet-box {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
}

.section-header {
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-header::before {
    content: '';
    width: 4px;
    height: 15px;
    background: var(--primary);
    border-radius: 2px;
}

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: var(--text);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: #1e293b;
    border-radius: 3px;
    accent-color: var(--primary);
    cursor: pointer;
}

.readout {
    display: block;
    margin-top: 5px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--primary);
    text-align: right;
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.comp-tool {
    background: #1e293b;
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 12px 5px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.comp-tool i {
    font-size: 1.2rem;
    color: var(--text-muted);
}

.comp-tool span {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
}

.comp-tool:hover {
    background: #334155;
    border-color: rgba(245, 158, 11, 0.4);
}

.comp-tool.active {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--primary);
}

.comp-tool.active i, .comp-tool.active span {
    color: var(--primary);
}

.phet-checkbox {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    cursor: pointer;
}

.phet-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.phet-checkbox span {
    font-size: 0.9rem;
    color: var(--text);
}

.actions-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: auto;
}

.action-btn {
    padding: 12px;
    border-radius: 8px;
    border: none;
    font-family: inherit;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.2s;
}

#btn-pause {
    background: #1e293b;
    color: white;
}

#btn-pause:hover {
    background: #334155;
}

.reset-btn {
    background: #7c2d12;
    color: #fdba74;
}

.reset-btn:hover {
    background: #9a3412;
}

::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #334155;
}