.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    padding: 0 var(--sp-5);
    background: var(--dark-bg);
    color: var(--text-on-dark);
    flex-shrink: 0;
    z-index: 100;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.header-brand .logo { height: 28px; width: auto; }

.app-title {
    font-size: var(--fs-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
}

.status-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--score-a);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: var(--fs-xs);
    color: var(--text-on-dark-secondary);
}

/* Navigation */
.tab-nav {
    display: flex;
    align-items: center;
    height: var(--nav-h);
    padding: 0 var(--sp-5);
    background: var(--dark-card);
    border-bottom: 1px solid var(--dark-card-border);
    gap: var(--sp-1);
    flex-shrink: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-link {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-4);
    border-radius: var(--radius);
    color: var(--text-on-dark-secondary);
    font-size: var(--fs-sm);
    font-weight: 500;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.tab-link:hover {
    color: var(--text-on-dark);
    background: var(--dark-hover);
    text-decoration: none;
}

.tab-link.active {
    color: #fff;
    background: var(--color-primary);
}

.tab-link svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Main content */
.app-main {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.module-section {
    position: absolute;
    inset: 0;
    overflow-y: auto;
    display: none;
}

.module-section.active {
    display: block;
}

.section-content {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: var(--sp-6);
}

.dark-section {
    background: var(--dark-bg);
    color: var(--text-on-dark);
}

.light-section {
    background: var(--bg);
    color: var(--text);
}

/* Footer */
.app-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--footer-h);
    padding: 0 var(--sp-5);
    background: var(--dark-bg);
    border-top: 1px solid var(--dark-card-border);
    font-size: var(--fs-xs);
    color: var(--text-on-dark-secondary);
    flex-shrink: 0;
}

/* Mobile */
@media (max-width: 768px) {
    .tab-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 3.5rem;
        justify-content: space-around;
        padding: 0;
        z-index: 100;
        border-top: 1px solid var(--dark-card-border);
        border-bottom: none;
    }

    .tab-link {
        flex-direction: column;
        gap: 2px;
        padding: var(--sp-1) var(--sp-2);
        font-size: var(--fs-xs);
    }

    .tab-link .tab-text { display: block; }

    .app-main { padding-bottom: 3.5rem; }
    .app-footer { display: none; }

    .section-content { padding: var(--sp-4); }
}