/* ===================================================
   INTERACTIVE INTERNAL COMBUSTION ENGINE SIMULATION CSS
   =================================================== */

.engine-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-family: 'Inter', sans-serif;
}

/* Header */
.engine-app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
}

.engine-app-title {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Back Link */
.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.back-link svg {
    width: 18px;
    height: 18px;
}

.back-link:hover {
    color: var(--color-accent);
}

/* Container */
.engine-container {
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Status Bar */
.status-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-reaction);
    box-shadow: 0 0 8px var(--color-reaction);
    animation: pulse 1.5s infinite;
}

.status-info {
    margin-left: auto;
    color: var(--color-text-secondary);
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.6; }
    100% { transform: scale(1); opacity: 1; }
}

/* Main Grid Layout */
.engine-main-grid {
    display: grid;
    grid-template-columns: 340px 1fr 440px;
    gap: 1.5rem;
    align-items: start;
}

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

/* Panel Sections */
.panel-section {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
}

.panel-section-title {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.75rem;
}

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

/* Tab Selector buttons */
.engine-type-tab-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    background: var(--color-bg-secondary);
    padding: 0.35rem;
    border-radius: 10px;
    border: 1px solid var(--color-border);
}

.engine-tab-btn {
    border: none;
    background: transparent;
    padding: 0.6rem;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

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

.engine-tab-btn.active {
    background: var(--color-bg-primary);
    color: var(--color-accent);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

/* Control Play/Pause & Step */
.control-actions-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.action-btn {
    padding: 0.75rem;
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
}

.action-btn.play {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

.action-btn.play:hover {
    filter: brightness(1.1);
}

.action-btn.step {
    background: transparent;
    color: var(--color-text-primary);
}

.action-btn.step:hover {
    background: var(--color-bg-secondary);
}

/* Inputs styling */
.prop-row {
    display: flex;
    gap: 1rem;
}

.prop-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.prop-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.prop-input {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    color: var(--color-text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.prop-input:focus {
    border-color: var(--color-accent);
    outline: none;
}

.prop-slider {
    width: 100%;
    margin-top: 0.4rem;
    accent-color: var(--color-accent);
}

/* Results section */
.engine-results-box {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px dashed var(--color-border);
}

.result-row:last-child {
    border-bottom: none;
}

.result-row-header {
    display: flex;
    flex-direction: column;
}

.result-row-lbl {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.result-row-desc {
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.result-row-val {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-accent);
}

.result-row-unit {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

/* Diagrams and Animation */
.diagram-container {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
}

.diagram-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.diagram-title {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

.dot.red {
    background-color: var(--color-accent);
}

.stroke-badge {
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.2s ease;
}

.stroke-badge.intake {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.stroke-badge.compression {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.stroke-badge.power {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.2);
}

.stroke-badge.exhaust {
    background: rgba(107, 114, 128, 0.15);
    color: #6b7280;
    border: 1px solid rgba(107, 114, 128, 0.3);
}

.diagram-canvas-wrap {
    border-radius: 12px;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

/* Theory Info Card */
.info-card {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.info-card-title {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.info-card-text {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

.info-formula {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 1rem;
    margin: 1rem 0;
    display: flex;
    justify-content: center;
    overflow-x: auto;
}