/**
 * AI Chat Assistant - Minimal Professional Design
 * Clean, modern, business-ready - Samsung Theme
 */

/* Variables - Samsung Blue Palette */
:root {
    --primary: #1428A0;
    --primary-dark: #0d1c78;
    --primary-light: #1e38cc;
    --bg-main: #fafafa;
    --bg-card: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-light: #e5e5e5;
    --border-medium: #d4d4d4;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 200ms ease;

    /* Spacing Scale (8px base unit) */
    --space-0: 0;
    --space-1: 0.25rem;    /* 4px */
    --space-2: 0.5rem;     /* 8px */
    --space-3: 0.75rem;    /* 12px */
    --space-4: 1rem;       /* 16px - base */
    --space-5: 1.25rem;    /* 20px */
    --space-6: 1.5rem;     /* 24px */
    --space-7: 1.75rem;    /* 28px */
    --space-8: 2rem;       /* 32px */
    --space-10: 2.5rem;    /* 40px */
    --space-12: 3rem;      /* 48px */
    --space-16: 4rem;      /* 64px */
}

/* Global */
body {
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
}

/* Container */
.ai-chat-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    min-height: calc(100vh - 80px);
}

/* Header */
.ai-chat-header {
    text-align: center;
    margin-bottom: var(--space-6);
    position: relative;
    z-index: 1;
}

.ai-chat-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    letter-spacing: -0.02em;
}

.ai-chat-header h1 .ai-icon {
    display: none; /* Remove emoji */
}

.ai-chat-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 400;
}

.ai-chat-header-actions {
    display: none; /* Hidden - button moved to sidebar */
}

/* Clear Button (now in sidebar) */
.ai-clear-chat-btn {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    box-shadow: var(--shadow-sm);
}

.ai-clear-chat-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #eef0fb;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.ai-clear-chat-btn svg {
    width: 16px;
    height: 16px;
}

/* Two Column Layout */
.ai-chat-main-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: var(--space-6);
    align-items: start;
}

/* Sidebar */
.ai-chat-sidebar {
    position: sticky;
    top: var(--space-4);
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.ai-chat-sidebar::-webkit-scrollbar {
    width: 4px;
}

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

.ai-chat-sidebar::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 10px;
}

.ai-chat-sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Disclaimer - Minimal Card */
.ai-chat-disclaimer {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.ai-chat-disclaimer strong {
    color: var(--text-primary);
    font-size: 0.813rem;
    font-weight: 600;
    display: block;
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ai-chat-disclaimer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ai-chat-disclaimer li {
    padding: var(--space-1) 0;
    color: var(--text-secondary);
    font-size: 0.813rem;
    border-bottom: 1px solid var(--border-light);
}

.ai-chat-disclaimer li:last-child {
    border-bottom: none;
}

.ai-chat-disclaimer li::before {
    content: '•';
    color: var(--primary);
    font-weight: bold;
    display: inline-block;
    width: var(--space-4);
    margin-right: var(--space-1);
}

.ai-chat-disclaimer p {
    margin: var(--space-3) 0 0 0;
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-light);
    color: var(--text-muted);
    font-size: 0.75rem;
    line-height: 1.4;
}

/* Quick Actions - Clean Buttons */
.ai-quick-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.quick-action-btn {
    padding: var(--space-3) var(--space-4);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition);
    text-align: left;
    box-shadow: var(--shadow-sm);
}

.quick-action-btn:hover {
    border-color: var(--primary);
    background: var(--bg-card);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.quick-action-btn:active {
    transform: translateX(2px);
}

/* Info Card */
.ai-info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.ai-info-card h3 {
    color: var(--text-primary);
    font-size: 0.813rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ai-info-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.ai-info-card li {
    padding: var(--space-1) 0;
    color: var(--text-secondary);
    font-size: 0.813rem;
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.ai-info-card li::before {
    content: '';
    width: 4px;
    height: 4px;
    background: var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
}

.ai-info-card a {
    display: block;
    margin-top: var(--space-4);
    padding: var(--space-3);
    background: var(--primary);
    color: white;
    text-align: center;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition);
}

.ai-info-card a:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Main Chat Area */
.ai-chat-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    min-height: calc(100vh - 150px);
}

/* Messages Container */
.ai-chat-messages {
    flex: 1;
    min-height: 400px;
    max-height: calc(100vh - 280px);
    padding: var(--space-6);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.ai-chat-messages::-webkit-scrollbar {
    width: 6px;
}

.ai-chat-messages::-webkit-scrollbar-track {
    background: var(--bg-main);
}

.ai-chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 10px;
}

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

/* Message */
.ai-message {
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
}

.ai-message.user {
    flex-direction: row-reverse;
}

.ai-message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.ai-message.user .ai-message-avatar {
    background: var(--primary);
    color: white;
}

.ai-message.assistant .ai-message-avatar {
    background: var(--bg-main);
    color: var(--text-primary);
}

.ai-message-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 70%;
}

.ai-message-bubble {
    padding: var(--space-4) var(--space-5);
    border-radius: var(--radius-md);
    line-height: 1.6;
    font-size: 0.938rem;
}

.ai-message.user .ai-message-bubble {
    background: var(--primary);
    color: white;
}

.ai-message.assistant .ai-message-bubble {
    background: var(--bg-main);
    color: var(--text-primary);
}

.ai-message-bubble strong {
    font-weight: 600;
}

.ai-message-bubble a {
    color: inherit;
    text-decoration: underline;
}

.ai-message.user .ai-message-bubble a {
    color: white;
}

.ai-message-bubble code {
    background: rgba(0, 0, 0, 0.08);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'SF Mono', 'Monaco', 'Courier New', monospace;
    font-size: 0.875em;
}

/* Message Actions */
.ai-message-actions {
    display: flex;
    gap: var(--space-2);
    opacity: 0;
    transition: opacity var(--transition);
}

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

.copy-message-btn {
    padding: var(--space-2) var(--space-3);
    background: white;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.copy-message-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.copy-message-btn.copied {
    border-color: #10b981;
    color: #10b981;
}

.copy-message-btn svg {
    width: 12px;
    height: 12px;
}

/* Typing Indicator */
.ai-typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--space-3);
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* Input Container */
.ai-chat-input-container {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    display: flex;
    gap: var(--space-4);
    align-items: flex-end;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.ai-chat-input-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(20, 40, 160, 0.1);
}

.ai-chat-textarea {
    flex: 1;
    min-height: 48px;
    max-height: 150px;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-light);
    background: var(--bg-main);
    resize: none;
    font-family: inherit;
    font-size: 0.938rem;
    color: var(--text-primary);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.ai-chat-textarea:focus {
    outline: none;
    border-color: var(--border-medium);
    background: white;
}

.ai-chat-textarea::placeholder {
    color: var(--text-muted);
}

.ai-char-counter {
    position: absolute;
    bottom: var(--space-3);
    right: 140px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* File Upload Button */
.ai-file-upload-btn {
    padding: var(--space-3);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-file-upload-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: #eef0fb;
}

.ai-file-upload-btn svg {
    width: 20px;
    height: 20px;
}

/* File Preview */
.ai-file-preview {
    position: absolute;
    bottom: 100%;
    left: 0;
    right: 0;
    margin-bottom: var(--space-2);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    box-shadow: var(--shadow-sm);
}

.ai-file-preview-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ai-file-preview-icon svg {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

.ai-file-preview-info {
    flex: 1;
    min-width: 0;
}

.ai-file-preview-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.ai-file-preview-size {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-1);
}

.ai-file-preview-remove {
    padding: var(--space-2);
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    transition: all var(--transition);
    border-radius: var(--radius-sm);
}

.ai-file-preview-remove:hover {
    background: #eef0fb;
    color: var(--primary);
}

.ai-file-preview-remove svg {
    width: 16px;
    height: 16px;
}

/* Message Attachment */
.ai-message-attachment {
    max-width: 250px;
    margin-bottom: var(--space-2);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

.ai-message-attachment img {
    width: 100%;
    height: auto;
    display: block;
}

.ai-chat-send-btn {
    padding: var(--space-3) var(--space-6);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.938rem;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    white-space: nowrap;
}

.ai-chat-send-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.ai-chat-send-btn:active:not(:disabled) {
    transform: translateY(0);
}

.ai-chat-send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ai-chat-send-btn svg {
    width: 16px;
    height: 16px;
}

/* Error Notification */
.ai-error-notification {
    position: fixed;
    top: 100px;
    right: 20px;
    background: white;
    color: var(--primary);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    border: 1px solid var(--primary);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    opacity: 0;
    transform: translateX(400px);
    transition: all var(--transition);
    font-weight: 500;
    font-size: 0.875rem;
}

.ai-error-notification.show {
    opacity: 1;
    transform: translateX(0);
}

/* Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ai-message {
    animation: slideInUp 0.3s ease;
}

/* Responsive */
@media (max-width: 1024px) {
    .ai-chat-main-layout {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .ai-chat-sidebar {
        position: relative;
        top: auto;
        max-height: none;
        order: 2;
    }

    .ai-chat-main {
        order: 1;
        min-height: auto;
    }

    .ai-chat-messages {
        max-height: 500px;
    }
}

@media (max-width: 768px) {
    .ai-chat-container {
        padding: var(--space-3) var(--space-3);
    }

    .ai-chat-header {
        margin-bottom: var(--space-4);
    }

    .ai-chat-header h1 {
        font-size: 1.5rem;
    }

    .ai-chat-header p {
        font-size: 0.813rem;
    }

    .ai-chat-messages {
        padding: var(--space-4);
        min-height: 350px;
        max-height: 450px;
    }

    .ai-message-content {
        max-width: 85%;
    }

    .ai-char-counter {
        right: 110px;
        font-size: 0.7rem;
    }

    .ai-message-actions {
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .ai-chat-container {
        padding: var(--space-4) var(--space-3);
    }

    .ai-chat-messages {
        padding: var(--space-4);
        gap: var(--space-5);
    }

    .ai-message-content {
        max-width: 100%;
    }

    .ai-message-avatar {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .ai-message-bubble {
        padding: var(--space-3) var(--space-4);
    }

    .ai-chat-input-container {
        flex-wrap: wrap;
    }

    .ai-chat-textarea {
        min-width: 100%;
        margin-bottom: var(--space-2);
    }

    .ai-file-upload-btn,
    .ai-chat-send-btn {
        flex: 1;
        padding: var(--space-3) var(--space-4);
    }

    .ai-char-counter {
        position: static;
        width: 100%;
        text-align: center;
        order: 3;
        margin-top: var(--space-2);
    }
}

/* Accessibility */
.ai-chat-send-btn:focus,
.ai-clear-chat-btn:focus,
.quick-action-btn:focus,
.copy-message-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}