/* App Layout — Sidebar fixed + Header/Main offset by margin */
.app-container {
    display: none;
    min-height: 100vh;
}

.app-container.active {
    display: block;
}

/* Sidebar */
.sidebar {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-logo {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 var(--space-lg);
    border-bottom: 1px solid var(--border);
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--text-primary);
    gap: var(--space-sm);
}

.sidebar-logo i {
    color: var(--accent);
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-md) var(--space-sm);
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-smooth);
    margin-bottom: 2px;
    font-size: var(--font-base);
    user-select: none;
    position: relative;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 60%;
    border-radius: 0 3px 3px 0;
    background: var(--gradient-accent);
    transition: transform var(--transition-bounce);
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item:hover::before {
    transform: translateY(-50%) scaleY(0.5);
}

.nav-item.active {
    background: var(--accent-muted);
    color: var(--accent);
    font-weight: 500;
    box-shadow: var(--shadow-glow-accent);
}

.nav-item.active::before {
    transform: translateY(-50%) scaleY(1);
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: var(--font-md);
}

.sidebar-footer {
    padding: var(--space-md);
    border-top: 1px solid var(--border);
}

/* Header */
.header {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-xl);
    margin-left: var(--sidebar-width);
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    height: var(--header-height);
    z-index: 90;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-title {
    font-size: var(--font-lg);
    font-weight: 600;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-lg);
    cursor: pointer;
    padding: var(--space-sm);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.wallet-badge {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--bg-tertiary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--success);
    font-size: var(--font-sm);
}

.wallet-badge i {
    font-size: var(--font-base);
}

/* Main Content */
.main-content {
    padding: var(--space-xl);
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

.page {
    display: none;
    animation: fadeIn 0.2s ease;
}

.page.active {
    display: block;
}

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

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.page.active {
    animation: pageEnter 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mobile sidebar overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
}