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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: #f5f7fa;
    color: #1e4b69;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 880px;
    margin: 0 auto;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1e4b69;
    margin-bottom: 4px;
    text-align: center;
}

.subtitle {
    text-align: center;
    color: #5a7a8a;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.corner-callouts {
    display: flex;
    justify-content: space-between;
    margin: 0 40px 10px;
}

.bottom-callouts {
    margin-top: 10px;
    margin-bottom: 20px;
}

.callout {
    display: flex;
    align-items: center;
    gap: 6px;
    background: #fff;
    border: 2px solid #d1dde5;
    border-radius: 20px;
    padding: 6px 14px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.82rem;
    font-weight: 600;
}

.callout:hover {
    border-color: #1e4b69;
    background: #edf2f7;
    transform: scale(1.04);
}

.callout.active {
    border-color: #1e4b69;
    background: #1e4b69;
    color: #fff;
}

.callout-icon {
    font-size: 1rem;
}

.callout-label {
    color: inherit;
}

.lifecycle-row {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
}

.lifecycle-stage {
    flex: 1;
    background: linear-gradient(135deg, #1e4b69, #2a6a8c);
    color: #fff;
    padding: 14px 8px;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s;
    position: relative;
}

.lifecycle-stage:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 14px rgba(30,75,105,0.25);
}

.lifecycle-stage.active {
    background: linear-gradient(135deg, #0d3550, #1e4b69);
    box-shadow: 0 4px 14px rgba(30,75,105,0.35);
}

.lifecycle-stage::after {
    content: '\25B6';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    color: #9ab;
    z-index: 2;
}

.lifecycle-stage:last-child::after {
    content: '';
}

.stage-label {
    font-size: 0.82rem;
    font-weight: 700;
}

.layers-container {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.layer-bar {
    display: flex;
    align-items: center;
    padding: 12px 18px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s;
    border: 2px solid transparent;
}

.layer-bar:hover {
    transform: translateX(4px);
    box-shadow: 0 3px 10px rgba(30,75,105,0.1);
}

.layer-bar.active {
    border-color: #1e4b69;
}

.layer-icon {
    font-size: 1.2rem;
    margin-right: 12px;
}

.layer-name {
    font-size: 0.88rem;
    font-weight: 700;
    flex: 1;
}

.layer-desc {
    font-size: 0.78rem;
    color: #5a7a8a;
}

.detail-panel {
    background: #fff;
    border: 1px solid #d1dde5;
    border-radius: 10px;
    padding: 18px 22px;
    box-shadow: 0 2px 8px rgba(30,75,105,0.06);
    margin-top: 20px;
}

.detail-title {
    font-size: 1rem;
    font-weight: 700;
    color: #1e4b69;
    margin-bottom: 8px;
}

.detail-body {
    font-size: 0.88rem;
    color: #3a6a82;
    line-height: 1.7;
}

.detail-body ul {
    margin-top: 8px;
    padding-left: 18px;
}

.detail-body li {
    margin-bottom: 4px;
}

.tooltip {
    position: fixed;
    background: #1e4b69;
    color: #fff;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.78rem;
    max-width: 260px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    line-height: 1.4;
}

.tooltip.visible {
    opacity: 1;
}

@media (max-width: 600px) {
    .lifecycle-row {
        flex-wrap: wrap;
    }

    .lifecycle-stage {
        flex: 1 1 30%;
    }

    .corner-callouts {
        margin: 0 10px 10px;
    }
}