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

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 20px;
}

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

.subtitle {
    text-align: center;
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.toggle-buttons {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
}

.toggle-btn {
    padding: 8px 20px;
    border: 2px solid #1e4b69;
    border-radius: 24px;
    background: #fff;
    color: #1e4b69;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.toggle-btn:hover {
    background: #e8eef3;
}

.toggle-btn.active {
    background: #1e4b69;
    color: #fff;
}

.architecture-wrapper {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    transition: all 0.4s ease;
}

.architecture-column {
    flex: 1;
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    transition: all 0.4s ease;
}

.architecture-column.hidden {
    display: none;
}

.col-header {
    text-align: center;
    padding-bottom: 12px;
    border-bottom: 2px solid #e5e7eb;
    margin-bottom: 16px;
}

.col-header h2 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.sync-header h2 { color: #2563eb; }
.async-header h2 { color: #16a34a; }

.latency-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.sync-header .latency-badge {
    background: #dbeafe;
    color: #2563eb;
}

.async-header .latency-badge {
    background: #dcfce7;
    color: #16a34a;
}

.flow-steps {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.flow-step {
    width: 100%;
    padding: 12px 14px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: default;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.flow-step:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.sync-step {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
}

.async-step {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
}

.step-number {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: #fff;
    flex-shrink: 0;
}

.sync-step .step-number { background: #2563eb; }
.async-step .step-number { background: #16a34a; }

.step-label {
    font-weight: 600;
    font-size: 0.88rem;
}

.flow-arrow {
    font-size: 1rem;
    line-height: 1;
}

.sync-arrow { color: #2563eb; }
.async-arrow { color: #16a34a; }

.shared-center {
    min-width: 160px;
    max-width: 180px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-top: 8px;
    transition: all 0.4s ease;
}

.shared-center.hidden {
    display: none;
}

.shared-center h3 {
    text-align: center;
    font-size: 0.85rem;
    color: #6b7280;
    margin-bottom: 4px;
}

.shared-component {
    background: #fff;
    border: 2px dashed #9ca3af;
    border-radius: 10px;
    padding: 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.shared-component:hover {
    border-color: #1e4b69;
    background: #f0f4f8;
    box-shadow: 0 2px 8px rgba(30, 75, 105, 0.1);
}

.shared-icon {
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.shared-component span {
    font-size: 0.8rem;
    font-weight: 600;
    color: #374151;
}

.detail-panel {
    display: none;
    background: #fff;
    border: 2px solid #1e4b69;
    border-radius: 10px;
    padding: 16px 40px 16px 16px;
    margin-top: 16px;
    position: relative;
    animation: fadeIn 0.3s ease;
}

.detail-panel.visible {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.detail-panel p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: #374151;
}

.close-btn {
    position: absolute;
    top: 8px;
    right: 12px;
    background: none;
    border: none;
    font-size: 1.4rem;
    color: #9ca3af;
    cursor: pointer;
    line-height: 1;
}

.close-btn:hover {
    color: #1e4b69;
}

.tooltip {
    display: none;
    position: fixed;
    background: #1e293b;
    color: #fff;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    line-height: 1.5;
    max-width: 280px;
    z-index: 1000;
    pointer-events: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

@media (max-width: 700px) {
    .architecture-wrapper {
        flex-direction: column;
    }

    .shared-center {
        flex-direction: row;
        max-width: 100%;
        min-width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .shared-center h3 {
        width: 100%;
    }

    .shared-component {
        flex: 1;
        min-width: 120px;
    }
}