/* ========================================
   Vietnam Airlines Clone - Sidebar Navigation
   Premium Deep Teal Design
   ======================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--color-primary-gradient);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 4px 0 30px rgba(0, 72, 80, 0.15);
}

/* Sidebar always expanded - no hover effect */

/* Logo Section */
.sidebar-logo {
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    min-height: 80px;
}

.sidebar-logo .logo-icon {
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-logo .logo-icon svg {
    width: 100%;
    height: 100%;
}

.sidebar-logo .logo-text {
    white-space: nowrap;
    opacity: 1;
    /* Always visible */
    display: flex;
    flex-direction: column;
}

.sidebar-logo .logo-text .brand-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-white);
    letter-spacing: 0.3px;
}

.sidebar-logo .logo-text .tagline {
    font-size: 10px;
    color: var(--color-accent);
    font-weight: 500;
    margin-top: 2px;
}

/* Navigation Menu */
.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Custom scrollbar for sidebar */
.sidebar-nav::-webkit-scrollbar {
    width: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 14px var(--spacing-lg);
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast);
    white-space: nowrap;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--color-white);
}

.nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: var(--color-accent);
    color: var(--color-white);
}

.nav-link .nav-icon {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
}

.nav-link:hover .nav-icon,
.nav-link.active .nav-icon {
    opacity: 1;
}

.nav-link .nav-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
}

.nav-link .nav-text {
    opacity: 1;
    /* Always visible */
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.2px;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Chat with NEO Button */
.chat-neo-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-md);
    background: linear-gradient(135deg, #00a8b5 0%, #007a85 100%);
    border-radius: var(--border-radius-lg);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(0, 168, 181, 0.3);
}

.chat-neo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 168, 181, 0.4);
}

.chat-neo-btn .neo-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.chat-neo-btn .neo-text {
    opacity: 1;
    /* Always visible */
    white-space: nowrap;
}

/* Lotusmiles Card */
.lotusmiles-card {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.lotusmiles-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.lotusmiles-header .lotus-icon {
    font-size: 16px;
}

.lotusmiles-header .lotus-text {
    font-size: 11px;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 1px;
    opacity: 1;
    /* Always visible */
}

.sidebar-auth {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.auth-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.auth-btn.login {
    background: transparent;
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    color: var(--color-white);
}

.auth-btn.login:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.auth-btn.register {
    background: var(--color-primary-dark);
    color: var(--color-white);
}

.auth-btn.register:hover {
    background: #003a42;
}

.auth-btn .btn-icon {
    font-size: 14px;
}

.auth-btn .btn-text {
    opacity: 1;
    /* Always visible */
    max-width: 120px;
}

/* Expand Toggle */
.sidebar-toggle {
    position: absolute;
    right: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-fast);
    z-index: 10;
}

.sidebar:hover .sidebar-toggle {
    opacity: 1;
}

.sidebar-toggle svg {
    width: 14px;
    height: 14px;
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.sidebar:hover .sidebar-toggle svg {
    transform: rotate(180deg);
}

/* Mobile Sidebar */
@media (max-width: 1024px) {
    .sidebar {
        width: 0;
        transform: translateX(-100%);
    }

    .sidebar.open {
        width: var(--sidebar-width-expanded);
        transform: translateX(0);
    }

    .sidebar.open .nav-link .nav-text,
    .sidebar.open .logo-text,
    .sidebar.open .auth-btn .btn-text,
    .sidebar.open .lotusmiles-header .lotus-text,
    .sidebar.open .chat-neo-btn .neo-text {
        opacity: 1;
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: none;
    }
}

/* Sidebar Overlay (Mobile) */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    backdrop-filter: blur(4px);
}

.sidebar.open~.sidebar-overlay {
    display: block;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: 1001;
    width: 48px;
    height: 48px;
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    color: var(--color-primary);
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    border: none;
    cursor: pointer;
}

@media (max-width: 1024px) {
    .mobile-menu-toggle {
        display: flex;
    }
}