/* Design System Variables */
:root {
    /* Colors */
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-primary-light: rgba(37, 99, 235, 0.1);
    --color-secondary: #7C3AED;
    --color-success: #059669;
    --color-warning: #D97706;
    --color-danger: #DC2626;
    --color-background: #F0F9FF;
    --color-background-hover: #E0F2FE;
    --color-surface: #FFFFFF;
    --color-text: #1F2937;  /* Dark text for main content */
    --color-text-light: #6B7280;  /* Grey text for secondary content */
    --color-text-lighter: #9CA3AF;  /* Lighter grey for tertiary content */
    --color-border: #CBD5E1;
    
    /* Chat-specific colors */
    --chat-bg: var(--color-surface);
    --message-bg: var(--color-background);
    --user-message-bg: var(--color-primary-light);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border Radius */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-full: 9999px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
}

/* Text Color Classes */
.text-primary {
    color: var(--color-text);
}

.text-secondary {
    color: var(--color-text-light);
}

.text-tertiary {
    color: var(--color-text-lighter);
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
    position: relative;
    background-color: var(--color-background);
    overflow-x: hidden;
    width: 100%;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    overflow-y: auto;
    z-index: 100;
    transition: all 0.3s ease;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

/* Custom scrollbar for Webkit browsers */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

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

.sidebar::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-text-secondary);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.sidebar-header-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: inherit;
}

.logo {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding-bottom: var(--spacing-xl);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: var(--border-radius-md);
    transition: all 0.2s ease;
    font-weight: 500;
}

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

.nav-item.active {
    background: var(--color-primary);
    color: white;
}

.nav-item i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
    color: var(--color-primary);
}

/* Main Content Styles */
.main-content {
    flex: 1;
    margin-left: 260px;
    padding: var(--spacing-lg);
    transition: margin-left 0.3s ease;
}

/* Main Header Styles */
.main-header {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
}

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

.header-left h1 {
    font-size: 2.25rem;
    font-weight: 400;
    color: var(--color-text);
    margin: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.3px;
}

.header-left p {
    font-size: 1.1rem;
    color: var(--color-text-light);
    line-height: 1.5;
    margin-top: var(--spacing-sm);
}

.header-right {
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-full);
    object-fit: cover;
}

/* Statistics Section */
.statistics-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.stat-content {
    flex: 1;
}

.stat-title {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.stat-trend {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
}

.stat-trend.positive {
    color: var(--color-success);
}

.stat-trend.negative {
    color: var(--color-danger);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.tool-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: all 0.2s ease;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.tool-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.tool-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.tool-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-tag {
    background: var(--color-background);
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
}

/* Recent Activity */
.recent-activity {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
}

.recent-activity h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 101;
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    width: 40px;
    height: 40px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.mobile-menu-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
}

.mobile-menu-btn:active {
    transform: translateY(0);
}

.mobile-menu-btn i {
    font-size: 1.2rem;
}

/* Chat Styles */
.chat-container {
    background: var(--chat-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    height: 70vh;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.message {
    max-width: 85%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    font-size: 0.95rem;
    line-height: 1.6;
    animation: fadeIn 0.3s ease-in-out;
}

.message.user {
    background: var(--user-message-bg);
    color: var(--color-primary);
    align-self: flex-end;
    border-bottom-right-radius: var(--border-radius-sm);
}

.message.assistant {
    background: var(--message-bg);
    color: var(--color-text);
    align-self: flex-start;
    border-bottom-left-radius: var(--border-radius-sm);
}

.message h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.message ul, .message ol {
    margin: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
}

.message li {
    margin: var(--spacing-xs) 0;
}

.typing-indicator {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--message-bg);
    border-radius: var(--border-radius-lg);
    align-self: flex-start;
    margin-bottom: var(--spacing-md);
    animation: fadeIn 0.3s ease-in-out;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }

.chat-input-container {
    padding: var(--spacing-lg);
    background: var(--chat-bg);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.chat-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
    background: var(--color-background);
    resize: none;
    min-height: 48px;
    max-height: 120px;
}

.chat-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.send-button {
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-lg);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.send-button:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.send-button:active {
    transform: translateY(0);
}

.error-message {
    background: #fee2e2;
    color: var(--color-danger);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    margin: var(--spacing-md) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Mobile styles */
@media (max-width: 1024px) {
    .mobile-menu-btn {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        width: 100%;
    }

    .chat-container {
        height: 80vh;
    }

    .message {
        max-width: 90%;
    }

    .chat-input-container {
        padding: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .statistics-section {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .main-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
}

/* Upload Area Styles */
.upload-area {
    position: relative;
    width: 100%;
    min-height: 200px;
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius-lg);
    background: var(--color-surface);
    transition: all 0.3s ease;
    cursor: pointer;
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--color-primary);
    background: var(--color-background-hover);
}

.upload-area.dragover {
    border-color: var(--color-primary);
    background: var(--color-background-hover);
}

.upload-content {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    text-align: center;
    pointer-events: none; /* Allow clicks to pass through to file input */
}

.upload-content i {
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.upload-content p {
    color: var(--color-text-light);
    margin: 0;
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 9999;
    pointer-events: auto;
    display: block;
}

.file-info {
    position: relative;
    padding: var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 2;
    margin: 0.5rem auto;
    width: 90%;
    max-width: 400px;
    border-radius: var(--border-radius-md);
}

.file-name {
    color: var(--color-text);
    font-size: 0.875rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    margin-right: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.remove-file {
    background: none;
    border: none;
    color: var(--color-danger);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all 0.2s ease;
    z-index: 2;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-file:hover {
    background: var(--color-background-hover);
    transform: scale(1.05);
}

/* Loading States */
.upload-area.loading {
    pointer-events: none;
    opacity: 0.7;
}

.upload-area.loading .upload-content {
    opacity: 0.5;
}

/* Success State */
.upload-area.success {
    border-color: var(--color-success);
}

.upload-area.success .upload-content i {
    color: var(--color-success);
}

/* Error State */
.upload-area.error {
    border-color: var(--color-danger);
}

.upload-area.error .upload-content i {
    color: var(--color-danger);
}