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

/* Navigation */
.main-nav {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    margin-top: -0.2rem;
}

.nav-tabs {
    display: flex;
    gap: 0.5rem;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Tab Content */
.tab-content {
    display: none;
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
    min-height: calc(100vh - 120px);
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

.tool-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tool-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
}

.tool-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Guide Section */
.guide-container {
    flex: 1;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding-right: 1rem;
}

.guide-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--bg-card);
    border-radius: var(--radius);
}

.guide-section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.guide-section:last-child {
    border-bottom: none;
}

.guide-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.guide-section h4 {
    color: var(--secondary-color);
    margin: 1.5rem 0 0.5rem 0;
    font-size: 1.1rem;
}

.guide-section p {
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.guide-section ul {
    margin: 1rem 0 1rem 1.5rem;
    color: var(--text-primary);
}

.guide-section li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}

.guide-section li strong {
    color: var(--accent-color);
}

.guide-section em {
    color: var(--success-color);
    font-style: italic;
    display: block;
    margin-top: 0.5rem;
}

.guide-container::-webkit-scrollbar {
    width: 6px;
}

.guide-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

.guide-container::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
}