/* KorvaxAI Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-hover: #5855eb;
    --primary-light: rgba(99, 102, 241, 0.1);
    --secondary-color: #1f2937;
    --accent-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --success-color: #10b981;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    --bg-sidebar: #1e293b;
    
    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    --text-dark: #0f172a;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --border-dark: #334155;
    
    /* 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);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Transitions */
    --transition: all 0.2s ease-in-out;
    --transition-fast: all 0.15s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

.h1 { font-size: 2.25rem; }
.h2 { font-size: 1.875rem; }
.h3 { font-size: 1.5rem; }
.h4 { font-size: 1.25rem; }
.h5 { font-size: 1.125rem; }
.h6 { font-size: 1rem; }

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-logo {
    width: 80px;
    height: 80px;
    margin-bottom: var(--space-4);
    animation: pulse 2s infinite;
}

.loading-text {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

/* Header */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
}

.logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
}

.brand-text {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.auth-buttons {
    display: flex;
    gap: var(--space-3);
}

.user-menu {
    position: relative;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    overflow: hidden;
    border: 2px solid var(--primary-color);
    transition: var(--transition);
}

.user-avatar:hover {
    transform: scale(1.05);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.user-dropdown {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1001;
}

.user-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-info {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-color);
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.user-email {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-tertiary);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: var(--space-2) 0;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    height: calc(100vh - 80px);
}

/* Chat Container */
.chat-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.chat-sidebar {
    width: 280px;
    background: var(--bg-sidebar);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-dark);
    transition: var(--transition);
}

.sidebar-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--border-dark);
}

.new-chat-btn {
    width: 100%;
    justify-content: center;
    gap: var(--space-2);
}

.chat-sessions {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2);
}

.session-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: var(--space-1);
    text-decoration: none;
    color: var(--text-light);
}

.session-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

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

.session-icon {
    width: 16px;
    color: var(--text-muted);
}

.session-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.875rem;
}

.sidebar-footer {
    padding: var(--space-4);
    border-top: 1px solid var(--border-dark);
}

.usage-info {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius);
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
}

/* Chat Main */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-card);
}

.chat-title {
    flex: 1;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.chat-actions {
    display: flex;
    gap: var(--space-2);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius);
    transition: var(--transition);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
    scroll-behavior: smooth;
}

/* Welcome Message */
.welcome-message {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--space-12) var(--space-4);
}

.welcome-logo {
    width: 120px;
    height: 120px;
    margin-bottom: var(--space-6);
    animation: float 6s ease-in-out infinite;
}

.welcome-message h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-message p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.suggested-prompts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
    max-width: 800px;
    margin: 0 auto;
}

.prompt-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.prompt-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.prompt-card i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.prompt-card span {
    font-weight: 500;
    color: var(--text-primary);
}

/* Message Bubbles */
.message {
    margin-bottom: var(--space-6);
    animation: fadeInUp 0.3s ease-out;
}

.message-user {
    display: flex;
    justify-content: flex-end;
}

.message-ai {
    display: flex;
    justify-content: flex-start;
}

.message-bubble {
    max-width: 70%;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    position: relative;
    word-wrap: break-word;
}

.message-bubble.user {
    background: var(--primary-color);
    color: white;
    border-bottom-right-radius: var(--radius);
}

.message-bubble.ai {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius);
}

.message-content {
    line-height: 1.6;
}

.message-content pre {
    background: var(--bg-tertiary);
    padding: var(--space-3);
    border-radius: var(--radius);
    overflow-x: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
}

.message-content code {
    background: var(--bg-tertiary);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-2);
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4);
    color: var(--text-secondary);
    font-style: italic;
}

.typing-dots {
    display: flex;
    gap: var(--space-1);
}

.typing-dot {
    width: 6px;
    height: 6px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: 0s; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

/* Chat Input */
.chat-input-area {
    padding: var(--space-4) var(--space-6);
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
}

.input-container {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    display: flex;
    align-items: flex-end;
    gap: var(--space-3);
    transition: var(--transition);
}

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

#messageInput {
    flex: 1;
    border: none;
    outline: none;
    resize: none;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    max-height: 120px;
    background: transparent;
    color: var(--text-primary);
}

#messageInput::placeholder {
    color: var(--text-muted);
}

#sendButton {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

#sendButton:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.05);
}

#sendButton:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.input-footer {
    margin-top: var(--space-2);
    text-align: center;
}

/* Landing Page */
.landing-page {
    width: 100%;
    overflow-y: auto;
}

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: var(--space-20) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

.brand-gradient {
    background: linear-gradient(135deg, #60a5fa, #34d399);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: var(--space-8);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.hero-image {
    text-align: center;
}

.hero-logo {
    width: 300px;
    height: 300px;
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
}

.features {
    padding: var(--space-20) 0;
    background: var(--bg-primary);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-12);
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
}

.feature-card {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-6);
}

.feature-icon i {
    font-size: 2rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
}

.btn-google {
    background: white;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-google:hover {
    background: var(--bg-tertiary);
}

.btn-large {
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    max-width: 400px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: scale(1);
}

.close-modal {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--text-primary);
}

.auth-form {
    animation: fadeIn 0.3s ease-out;
}

.auth-form h2 {
    text-align: center;
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.form-group {
    margin-bottom: var(--space-4);
}

.form-group input {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.divider {
    display: flex;
    align-items: center;
    margin: var(--space-6) 0;
    color: var(--text-muted);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    margin: 0 var(--space-4);
    font-size: 0.875rem;
}

.auth-links {
    text-align: center;
    margin-top: var(--space-6);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Toast Notifications */
.toast {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    z-index: 10001;
    transform: translateX(100%);
    transition: var(--transition);
    min-width: 300px;
}

.toast.show {
    transform: translateX(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    flex: 1;
    color: var(--text-primary);
}

.toast.success {
    border-color: var(--success-color);
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error {
    border-color: var(--danger-color);
}

.toast.error .toast-icon {
    color: var(--danger-color);
}

.toast.warning {
    border-color: var(--warning-color);
}

.toast.warning .toast-icon {
    color: var(--warning-color);
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-danger { color: var(--danger-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

@keyframes typing {
    0%, 20% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.5; }
    80%, 100% { transform: scale(1); opacity: 1; }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .chat-sidebar {
        width: 250px;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--space-8);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .chat-container {
        position: relative;
    }
    
    .chat-sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease-in-out;
    }
    
    .chat-sidebar.show {
        left: 0;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .chat-header {
        padding: var(--space-4);
    }
    
    .chat-messages {
        padding: var(--space-2);
    }
    
    .chat-input-area {
        padding: var(--space-4);
    }
    
    .message-bubble {
        max-width: 85%;
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero {
        padding: var(--space-16) 0;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .btn-large {
        padding: var(--space-3) var(--space-6);
    }
    
    .features {
        padding: var(--space-16) 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: var(--space-6);
    }
    
    .suggested-prompts {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .welcome-message {
        padding: var(--space-8) var(--space-2);
    }
    
    .welcome-logo {
        width: 80px;
        height: 80px;
    }
    
    .welcome-message h2 {
        font-size: 1.5rem;
    }
    
    .modal-content {
        padding: var(--space-6);
        margin: var(--space-4);
    }
    
    .toast {
        right: var(--space-4);
        left: var(--space-4);
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .prompt-card {
        text-align: center;
        flex-direction: column;
    }
}

/* Dark mode support (future enhancement) */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here */
}

/* Print styles */
@media print {
    .header,
    .chat-sidebar,
    .chat-input-area,
    .loading-screen,
    .modal,
    .toast {
        display: none !important;
    }
    
    .chat-messages {
        height: auto !important;
        overflow: visible !important;
    }
}