/* 
   Professional AI Chat Interface
   Enterprise-grade design for education and business
*/

/* Reset and Mobile-First Base */
* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    /* Trending Deep Sea Professional 2024 - Ocean Blue */
    --primary: #0C1844;
    --primary-light: #1E40AF;
    --primary-dark: #0B1426;
    --secondary: #2563EB;
    --secondary-light: #3B82F6;
    --secondary-dark: #1D4ED8;
    --accent: #60A5FA;
    --accent-light: #93C5FD;
    --accent-research: #8B5CF6;
    --accent-research-light: #A78BFA;
    
    /* Modern Ocean Gradient Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --bg-quaternary: #E2E8F0;
    --bg-gradient: linear-gradient(135deg, #F8FAFC 0%, #F1F5F9 50%, #E2E8F0 100%);
    --bg-gradient-accent: linear-gradient(135deg, #0C1844 0%, #1E40AF 100%);
    --bg-gradient-soft: linear-gradient(135deg, #EBF8FF 0%, #DBEAFE 100%);
    
    /* Professional Text Colors */
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-muted: #64748B;
    --text-light: #94A3B8;
    
    /* Professional Borders */
    --border: #E5E7EB;
    --border-light: #F3F4F6;
    --border-dark: #D1D5DB;
    
    /* Professional Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Professional Spacing */
    --touch-target: 44px;
    --touch-target-lg: 52px;
    --border-radius: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --spacing: 16px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* AI Mode Colors */
    --creative-primary: #3B82F6;
    --creative-secondary: #EFF6FF;
    --creative-border: #DBEAFE;
    --research-primary: #8B5CF6;
    --research-secondary: #F3F4F6;
    --research-border: #E9D5FF;
    
    /* Status Colors */
    --success: #10B981;
    --success-light: #D1FAE5;
    --warning: #F59E0B;
    --warning-light: #FEF3C7;
    --error: #EF4444;
    --error-light: #FEE2E2;
    
    /* Math rendering colors */
    --math-error-bg: #FEF2F2;
    --math-error-border: #FECACA;
    --math-error-text: #DC2626;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-gradient);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
    letter-spacing: -0.011em;
}

/* Modern App-like Layout */
.chat-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100vw;
    margin: 0 auto;
    background: var(--bg-secondary);
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-light);
}

/* Professional Header */
.chat-header {
    background: var(--bg-gradient-accent);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 72px;
}

.brand-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--secondary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow);
}

.brand-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    color: white;
    letter-spacing: -0.025em;
}

.school-info {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 2px;
    font-weight: 500;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.header-tools {
    display: flex;
    gap: var(--spacing-sm);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.header-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: var(--spacing-sm);
    border-radius: 12px;
    min-width: var(--touch-target);
    min-height: var(--touch-target);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    font-weight: 500;
}

.header-btn:hover, .header-btn:focus {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Header Mode Selector Styles */
.header-mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.header-mode-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    font-weight: 500;
    font-size: 0.875rem;
    min-height: var(--touch-target);
}

.header-mode-btn:hover, .header-mode-btn:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.header-mode-btn.active {
    background: white;
    color: var(--primary);
    border-color: white;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3), 0 0 0 2px rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    font-weight: 700;
}

.header-mode-btn.active:hover {
    background: white;
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4), 0 0 0 2px rgba(255, 255, 255, 0.7);
}

.header-mode-btn span {
    font-weight: 600;
}

/* Professional AI Mode Selector */
.ai-mode-selector {
    position: relative;
}

.mode-toggle-container {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    padding: 4px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.mode-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 120px;
    position: relative;
    overflow: hidden;
}

.mode-toggle:hover {
    background: var(--bg-quaternary);
}

.mode-toggle.active {
    background: var(--bg-gradient-soft);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    border: 1px solid var(--secondary-light);
}

.mode-toggle[data-mode="creative"].active {
    background: linear-gradient(135deg, #EBF8FF 0%, #DBEAFE 100%);
    border: 1px solid var(--secondary);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.mode-toggle[data-mode="research"].active {
    background: linear-gradient(135deg, #F3E8FF 0%, #E9D5FF 100%);
    border: 1px solid var(--accent-research-light);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.2);
}

.mode-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    transition: color 0.2s ease;
}

.mode-toggle.active .mode-icon {
    color: var(--text-primary);
}

.mode-toggle[data-mode="creative"].active .mode-icon {
    color: var(--creative-primary);
}

.mode-toggle[data-mode="research"].active .mode-icon {
    color: var(--research-primary);
}

.mode-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-width: 0;
}

.mode-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
}

.mode-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.2;
    margin-top: 1px;
}

.mode-toggle.active .mode-subtitle {
    color: var(--text-secondary);
}

/* AI Mode Indicator in Messages */
.ai-mode-indicator {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    padding: 4px 8px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    display: inline-block;
    font-weight: 500;
    border: 1px solid var(--border-light);
}

/* Export Menu */
.export-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-sm);
    min-width: 220px;
    z-index: 50;
    border: 1px solid var(--border);
    backdrop-filter: blur(20px);
}

.export-menu a {
    display: block;
    padding: 12px var(--spacing);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    font-size: 0.9rem;
}

.export-menu a:hover {
    background: var(--bg-tertiary);
    color: var(--primary);
    transform: translateX(4px);
}

.hidden {
    display: none !important;
    visibility: hidden !important;
    opacity: 0 !important;
}

/* Modern Chat Container */
.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* Custom Scrollbar for Modern Look */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

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

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

/* Professional Welcome Section */
.welcome-section {
    margin: var(--spacing-xl) var(--spacing-lg);
    background: var(--bg-gradient);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.welcome-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-gradient-accent);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.welcome-content {
    padding: var(--spacing-xl);
}

.welcome-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.welcome-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    border-radius: var(--border-radius-lg);
    color: white;
    margin-bottom: var(--spacing);
    box-shadow: var(--shadow-md);
}

.welcome-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
    letter-spacing: -0.025em;
}

.welcome-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin: 0;
    font-weight: 500;
}

.welcome-description {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.welcome-description p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.mode-explanation {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing);
    margin-top: var(--spacing-lg);
}

.mode-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-md);
    padding: var(--spacing);
    transition: all 0.2s ease;
}

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

.mode-card.creative {
    border-color: var(--creative-border);
    background: var(--creative-secondary);
}

.mode-card.research {
    border-color: var(--research-border);
    background: var(--research-secondary);
}

.mode-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.mode-card.creative .mode-card-icon {
    background: var(--creative-primary);
    color: white;
}

.mode-card.research .mode-card-icon {
    background: var(--research-primary);
    color: white;
}

.mode-card-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
}

.mode-card-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
}

/* Modern Message Bubbles */
.message-container {
    margin-bottom: var(--spacing);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    animation: messageSlideIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.message-container.user {
    flex-direction: row-reverse;
    justify-content: flex-start;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.message-avatar.user {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.message-avatar.assistant {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.message-bubble {
    max-width: 85%;
    padding: 18px 22px;
    border-radius: 20px;
    position: relative;
    box-shadow: var(--shadow-md);
    word-wrap: break-word;
    font-size: 1rem;
    line-height: 1.6;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

/* Message Actions Container */
.message-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: all 0.2s ease;
    z-index: 5;
}

.message-bubble:hover .message-actions {
    opacity: 1;
}

/* Shared Button Styles */
.copy-message-btn,
.speak-message-btn,
.download-audio-btn {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-muted);
    backdrop-filter: blur(4px);
}

.copy-message-btn:hover,
.speak-message-btn:hover,
.download-audio-btn:hover {
    background: rgba(255, 255, 255, 1);
    border-color: var(--border);
    color: var(--text-primary);
    transform: scale(1.05);
}

.copy-message-btn:disabled,
.speak-message-btn:disabled,
.download-audio-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Download button specific styling */
.download-audio-btn {
    color: #28a745;
}

.download-audio-btn:hover {
    color: #1e7e34;
    background: rgba(40, 167, 69, 0.1);
}

/* User Message Button Styles */
.message-bubble.user .copy-message-btn,
.message-bubble.user .speak-message-btn,
.message-bubble.user .download-audio-btn {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.8);
}

.message-bubble.user .copy-message-btn:hover,
.message-bubble.user .speak-message-btn:hover,
.message-bubble.user .download-audio-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    color: white;
}

.message-bubble.user .download-audio-btn {
    color: rgba(255, 255, 255, 0.9);
}

.message-bubble.user .download-audio-btn:hover {
    color: white;
}

.message-bubble.user {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
    color: white;
    border-bottom-right-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.message-bubble.assistant {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-bottom-left-radius: 8px;
    backdrop-filter: blur(10px);
}

/* Message Tails */
.message-bubble.user::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: -8px;
    width: 0;
    height: 0;
    border-left: 16px solid var(--secondary-light);
    border-top: 16px solid transparent;
    filter: drop-shadow(-1px 1px 2px rgba(0, 0, 0, 0.1));
}

.message-bubble.assistant::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -8px;
    width: 0;
    height: 0;
    border-right: 16px solid var(--bg-secondary);
    border-top: 16px solid transparent;
    filter: drop-shadow(1px 1px 2px rgba(0, 0, 0, 0.1));
}

/* Typing Indicator - More Playful */
.typing-container {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing);
}

.typing-indicator {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    border-bottom-left-radius: 8px;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: var(--shadow-md);
    position: relative;
    backdrop-filter: blur(10px);
}

.typing-indicator::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -8px;
    width: 0;
    height: 0;
    border-right: 16px solid var(--bg-secondary);
    border-top: 16px solid transparent;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }
.typing-dot:nth-child(3) { animation-delay: 0s; }

@keyframes typingBounce {
    0%, 80%, 100% { 
        transform: translateY(0) scale(0.8);
        opacity: 0.5;
    }
    40% { 
        transform: translateY(-8px) scale(1.2);
        opacity: 1;
    }
}

/* Modern Input Area - Touch Optimized */
.chat-input-area {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--spacing);
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(20px);
}

.input-container {
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 24px;
    padding: 12px;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    backdrop-filter: blur(10px);
}

.input-container:focus-within {
    border-color: var(--secondary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1), var(--shadow-lg);
    background: var(--bg-primary);
    transform: translateY(-2px);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    padding: var(--spacing-sm);
    min-height: 44px;
    max-height: 120px;
    overflow-y: auto;
    border-radius: var(--border-radius);
}

.chat-input::placeholder {
    color: var(--text-secondary);
}

/* Touch-Friendly Send Button */
.send-button {
    background: var(--bg-gradient-accent);
    border: none;
    color: white;
    width: var(--touch-target);
    height: var(--touch-target);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.send-button:hover, .send-button:focus {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-xl);
    filter: brightness(1.1);
}

.send-button:active {
    transform: translateY(0) scale(0.95);
}

.send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.send-button svg {
    width: 20px;
    height: 20px;
}

/* Professional Quick Actions Section */
.quick-actions-section {
    margin: var(--spacing-lg) var(--spacing-lg) 0;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.quick-actions-title {
    padding: var(--spacing) var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.quick-actions-title::before {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    background: var(--secondary);
    border-radius: 50%;
    flex-shrink: 0;
}

.quick-actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1px;
    background: var(--border);
}

.quick-action-card {
    background: var(--bg-primary);
    padding: var(--spacing);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s ease;
    min-height: 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.quick-action-card:hover {
    background: var(--bg-secondary);
    transform: translateY(-1px);
}

.quick-action-card:active {
    transform: translateY(0);
}

.quick-action-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.quick-action-card:hover .quick-action-icon {
    background: var(--secondary);
    color: white;
    transform: scale(1.1);
}

.quick-action-text {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.3;
    transition: color 0.2s ease;
}

.quick-action-card:hover .quick-action-text {
    color: var(--text-primary);
}

/* Legacy Quick Actions - Touch Friendly */
.quick-actions {
    display: flex;
    gap: 12px;
    padding: var(--spacing) var(--spacing-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.quick-action {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 12px 18px;
    white-space: nowrap;
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: var(--touch-target);
    display: flex;
    align-items: center;
    font-weight: 500;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.quick-action:hover, .quick-action:focus {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

/* Privacy Notice */
.privacy-notice {
    margin-top: var(--spacing);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    line-height: 1.5;
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 12px;
    border: 1px solid var(--border-light);
}

.privacy-notice a {
    color: var(--primary);
    text-decoration: none;
}

.privacy-notice a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (min-width: 640px) {
    .chat-app {
        max-width: 640px;
        margin: 0 auto;
        border-radius: 24px;
        overflow: hidden;
        box-shadow: var(--shadow-xl);
        margin-top: var(--spacing);
        margin-bottom: var(--spacing);
        height: calc(100vh - 32px);
        backdrop-filter: blur(20px);
    }
    
    body {
        padding: var(--spacing);
        background-attachment: fixed;
    }
}

@media (min-width: 768px) {
    .chat-app {
        max-width: 768px;
    }
    
    .message-bubble {
        max-width: 75%;
    }
    
    .chat-input {
        font-size: 1.1rem;
    }
}

@media (min-width: 1024px) {
    .chat-app {
        max-width: 900px;
    }
    
    .message-bubble {
        max-width: 70%;
    }
}

/* iPad and Tablet Optimizations */
@media (min-width: 768px) and (max-width: 1024px) {
    .chat-header {
        padding: var(--spacing-lg) var(--spacing-lg);
    }
    
    .chat-messages {
        padding: var(--spacing-lg);
    }
    
    .chat-input-area {
        padding: var(--spacing-lg);
    }
    
    .send-button {
        width: 52px;
        height: 52px;
    }
    
    .message-avatar {
        width: 44px;
        height: 44px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0F172A;
        --bg-secondary: #1E293B;
        --bg-tertiary: #334155;
        --bg-gradient: linear-gradient(135deg, #0F172A 0%, #1E293B 50%, #0F172A 100%);
        --text-primary: #F1F5F9;
        --text-secondary: #94A3B8;
        --text-muted: #64748B;
        --border: #334155;
        --border-light: #475569;
    }
    
    body {
        background: var(--bg-gradient);
    }
    
    .welcome-message {
        background: linear-gradient(135deg, rgba(15, 118, 110, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
        border-color: var(--border);
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus management for keyboard users */
.chat-input:focus,
.send-button:focus,
.header-btn:focus,
.quick-action:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Loading states */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Error states */
.error-message {
    color: #EF4444;
    background: #FEF2F2;
    border: 1px solid #FECACA;
    padding: var(--spacing);
    border-radius: var(--border-radius);
    margin: var(--spacing-sm) 0;
}

/* Math rendering styles */
.math-error {
    background: var(--math-error-bg);
    border: 1px solid var(--math-error-border);
    border-radius: 4px;
    color: var(--math-error-text);
    padding: 4px 8px;
    font-family: monospace;
    font-size: 0.9em;
    display: inline-block;
    margin: 2px;
}

/* KaTeX math expressions styling */
.katex-display,
.katex-display-wrapper {
    margin: 1em 0;
    text-align: center;
}

.katex-display-wrapper .katex-display {
    margin: 0;
}

.katex {
    font-size: 1.1em;
    max-width: 100%;
    overflow-x: auto;
}

/* Prevent math expressions from breaking layout */
.katex-display {
    overflow-x: auto;
    overflow-y: hidden;
}

.katex-display-wrapper {
    overflow-x: auto;
    overflow-y: hidden;
}

/* Ensure message content doesn't overflow */
.markdown-content {
    word-wrap: break-word;
    overflow-wrap: break-word;
    max-width: 100%;
}

.message-bubble {
    overflow-x: auto;
}

/* Comprehensive Markdown Styling */
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin: 1.5em 0 1em 0;
    line-height: 1.3;
}

.markdown-content h1 { font-size: 1.5em; }
.markdown-content h2 { font-size: 1.3em; }
.markdown-content h3 { font-size: 1.1em; }
.markdown-content h4 { font-size: 1em; font-weight: 700; }

/* Tables */
.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.markdown-content th,
.markdown-content td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.markdown-content th {
    background: var(--primary);
    color: white;
    font-weight: 600;
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.markdown-content tr:last-child td {
    border-bottom: none;
}

.markdown-content tr:hover {
    background: var(--bg-tertiary);
}

/* Code blocks */
.markdown-content pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1em;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 1em 0;
    border: 1px solid var(--border);
}

.markdown-content code {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
}

/* Lists */
.markdown-content ul,
.markdown-content ol {
    margin: 1em 0;
    padding-left: 1.5em;
}

.markdown-content li {
    margin: 0.5em 0;
    line-height: 1.6;
}

.markdown-content ul ul,
.markdown-content ol ol,
.markdown-content ul ol,
.markdown-content ol ul {
    margin: 0.5em 0;
}

/* Blockquotes */
.markdown-content blockquote {
    border-left: 4px solid var(--primary);
    background: var(--bg-tertiary);
    margin: 1em 0;
    padding: 1em 1.5em;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* Links */
.markdown-content a {
    color: var(--primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

.markdown-content a:hover {
    border-bottom-color: var(--primary);
    color: var(--primary-dark);
}

/* Horizontal rules */
.markdown-content hr {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
    margin: 2em 0;
}

/* Emphasis */
.markdown-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-content em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Strikethrough */
.markdown-content del {
    text-decoration: line-through;
    opacity: 0.7;
}

/* Responsive tables */
@media (max-width: 640px) {
    .markdown-content table {
        font-size: 0.9em;
    }
    
    .markdown-content th,
    .markdown-content td {
        padding: 8px 12px;
    }
}

/* Mode Switch Dialog Styles */
.dialog-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.dialog-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.dialog-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 400px;
    width: calc(100% - 2rem);
    margin: 1rem;
    overflow: hidden;
    transform: scale(1);
    transition: transform 0.3s ease;
}

.dialog-overlay.hidden .dialog-content {
    transform: scale(0.9);
}

.dialog-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background: var(--bg-gradient);
}

.dialog-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.dialog-body {
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.5;
}

.dialog-actions {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    background: var(--bg-secondary);
}

.dialog-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.dialog-btn-cancel {
    background: var(--bg-primary);
    color: var(--text-secondary);
}

.dialog-btn-cancel:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-dark);
}

.dialog-btn-confirm {
    background: var(--bg-gradient-accent);
    color: white;
    border-color: var(--primary);
}

.dialog-btn-confirm:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Adjust AI Mode Selector for Input Area Position */
.chat-input-area .ai-mode-selector {
    margin-bottom: var(--spacing-md);
}

.chat-input-area .mode-toggle-container {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-md);
    padding: 4px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    justify-content: center;
    max-width: 400px;
    margin: 0 auto;
}

.chat-input-area .mode-toggle {
    flex: 1;
    min-width: auto;
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-sm);
}

.chat-input-area .mode-text {
    text-align: center;
}

.chat-input-area .mode-title {
    font-size: 0.875rem;
    font-weight: 600;
}

.chat-input-area .mode-subtitle {
    font-size: 0.75rem;
    opacity: 0.8;
}