/* Base styles and layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--gradient-background);
    color: var(--text-primary);
    line-height: var(--line-height-normal);
    font-weight: var(--font-weight-normal);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 25% 25%, rgba(124, 58, 237, 0.1) 0%, transparent 25%),
        radial-gradient(circle at 75% 75%, rgba(139, 92, 246, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 50% 50%, rgba(168, 85, 247, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* App layout */
.app {
    display: flex;
    height: 100vh;
    width: 100%;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.font-medium {
    font-weight: var(--font-weight-medium);
}

.font-semibold {
    font-weight: var(--font-weight-semibold);
}

.font-bold {
    font-weight: var(--font-weight-bold);
}

.text-sm {
    font-size: var(--font-size-sm);
}

.text-lg {
    font-size: var(--font-size-lg);
}

.text-xl {
    font-size: var(--font-size-xl);
}

/* Responsive utilities */
.mobile-only {
    display: none;
}

.desktop-only {
    display: block;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block;
    }
    
    .desktop-only {
        display: none;
    }
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: rgba(15, 15, 30, 0.4);
    backdrop-filter: var(--blur-lg);
    border-right: var(--glass-border);
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: var(--z-fixed);
    box-shadow: var(--shadow-glass);
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glass);
    pointer-events: none;
    z-index: -1;
}

.sidebar-header {
    padding: var(--space-6);
    border-bottom: var(--glass-border);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: var(--blur-md);
    position: relative;
}

.sidebar-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(124, 58, 237, 0.3), transparent);
}

.sidebar-footer {
    margin-top: auto;
    padding: var(--space-4);
    border-top: var(--glass-border);
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: var(--blur-md);
}

/* Main content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.logo i {
    font-size: var(--font-size-xl);
    color: var(--accent-primary);
}

.logo h2,
.logo h3 {
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: var(--radius-lg);
    transition: background var(--transition-normal);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-secondary);
}

/* Loading states */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: var(--blur-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    color: var(--text-primary);
}

.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
    animation: pulse 2s ease-in-out infinite;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-4);
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.3);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: var(--blur-md);
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    box-shadow: var(--shadow-glass-strong);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    max-width: 400px;
    animation: toastSlideIn var(--duration-normal) ease-out;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.toast::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glass);
    pointer-events: none;
    z-index: -1;
}

.toast.toast-success {
    border-left: 4px solid var(--success);
}

.toast.toast-error {
    border-left: 4px solid var(--error);
}

.toast.toast-warning {
    border-left: 4px solid var(--warning);
}

.toast.toast-info {
    border-left: 4px solid var(--info);
}

.toast.toast-exit {
    animation: toastSlideOut var(--duration-normal) ease-in forwards;
}

@keyframes toastSlideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes toastSlideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Focus states */
*:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Selection styling */
::selection {
    background: var(--accent-primary);
    color: var(--text-primary);
}

/* Responsive design */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        top: 0;
        left: -100%;
        z-index: var(--z-modal);
        transition: left var(--transition-normal);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .main-content {
        width: 100%;
        padding-top: var(--header-height);
    }
}

/* Print styles */
@media print {
    .sidebar,
    .chat-header,
    .input-container,
    .loading,
    .toast-container {
        display: none !important;
    }
    
    .main-content {
        width: 100% !important;
    }
    
    .messages {
        background: white !important;
        color: black !important;
    }
}