/* ===============================================
   AI Chat UI - Modern Ambient Styling
   =============================================== */

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

:root {
    /* Light Theme Colors */
    --primary-bg-light: #ffffff;
    --secondary-bg-light: #f8fafc;
    --tertiary-bg-light: #f1f5f9;
    --text-primary-light: #1e293b;
    --text-secondary-light: #64748b;
    --text-muted-light: #94a3b8;
    --border-light: #e2e8f0;
    --border-focus-light: #3b82f6;
    --accent-light: #3b82f6;
    --accent-hover-light: #2563eb;
    --success-light: #10b981;
    --warning-light: #f59e0b;
    --error-light: #ef4444;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --glass-bg-light: rgba(255, 255, 255, 0.8);
    
    /* Dark Theme Colors */
    --primary-bg-dark: #0f172a;
    --secondary-bg-dark: #1e293b;
    --tertiary-bg-dark: #334155;
    --text-primary-dark: #f8fafc;
    --text-secondary-dark: #cbd5e1;
    --text-muted-dark: #94a3b8;
    --border-dark: #334155;
    --border-focus-dark: #3b82f6;
    --accent-dark: #3b82f6;
    --accent-hover-dark: #60a5fa;
    --success-dark: #10b981;
    --warning-dark: #f59e0b;
    --error-dark: #ef4444;
    --shadow-dark: rgba(0, 0, 0, 0.3);
    --glass-bg-dark: rgba(15, 23, 42, 0.8);
    
    /* Dynamic Variables (will switch based on theme) */
    --primary-bg: var(--primary-bg-dark);
    --secondary-bg: var(--secondary-bg-dark);
    --tertiary-bg: var(--tertiary-bg-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-muted: var(--text-muted-dark);
    --border-color: var(--border-dark);
    --border-focus: var(--border-focus-dark);
    --accent: var(--accent-dark);
    --accent-hover: var(--accent-hover-dark);
    --success: var(--success-dark);
    --warning: var(--warning-dark);
    --error: var(--error-dark);
    --shadow: var(--shadow-dark);
    --glass-bg: var(--glass-bg-dark);
    
    /* Layout */
    --header-height: 70px;
    --input-height: 120px;
    --border-radius: 12px;
    --border-radius-small: 8px;
    --border-radius-large: 16px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* Animations */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
    --primary-bg: var(--primary-bg-light);
    --secondary-bg: var(--secondary-bg-light);
    --tertiary-bg: var(--tertiary-bg-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
    --text-muted: var(--text-muted-light);
    --border-color: var(--border-light);
    --border-focus: var(--border-focus-light);
    --accent: var(--accent-light);
    --accent-hover: var(--accent-hover-light);
    --success: var(--success-light);
    --warning: var(--warning-light);
    --error: var(--error-light);
    --shadow: var(--shadow-light);
    --glass-bg: var(--glass-bg-light);
}

/* Base Body Styling */
body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    min-height: 100vh;
    overflow: hidden;
}

/* ===============================================
   Main Chat Container
   =============================================== */

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
    margin: 0 auto;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    position: relative;
}

/* ===============================================
   Header
   =============================================== */

.chat-header {
    height: var(--header-height);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    box-shadow: 0 4px 12px var(--shadow);
}

.header-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.app-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.status-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius-small);
    background: var(--tertiary-bg);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 1rem;
}

.action-btn:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow);
}

.action-btn.end-chat {
    background: var(--error);
    color: white;
}

.action-btn.end-chat:hover {
    background: #dc2626;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* ===============================================
   Message Styling
   =============================================== */

.message {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: messageSlideIn var(--transition-normal) ease forwards;
}

@keyframes messageSlideIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.message.user .message-avatar {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, var(--success), var(--success-hover));
}

.message-content {
    flex: 1;
    max-width: 70%;
}

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

.message-bubble {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    box-shadow: 0 2px 8px var(--shadow);
    position: relative;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: white;
    border-color: var(--accent);
}

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

.message-text {
    line-height: 1.6;
    word-wrap: break-word;
}

.message-text p {
    margin: 0 0 0.5rem 0;
}

.message-text p:last-child {
    margin-bottom: 0;
}

.message-text code {
    background: var(--tertiary-bg);
    padding: 0.125rem 0.25rem;
    border-radius: var(--border-radius-small);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875em;
}

.message-text pre {
    background: var(--tertiary-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 0.5rem 0;
}

.message-text pre code {
    background: none;
    padding: 0;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.message-time {
    opacity: 0.8;
}

.message-status {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    opacity: 0.7;
}

/* ===============================================
   Typing Indicator
   =============================================== */

.typing-indicator {
    display: none;
    gap: 1rem;
    padding: 0 1.5rem 1rem 1.5rem;
    animation: messageSlideIn var(--transition-normal) ease;
}

.typing-indicator.show {
    display: flex;
}

.typing-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.typing-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    box-shadow: 0 2px 8px var(--shadow);
}

.typing-dots {
    display: flex;
    gap: 0.25rem;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    animation: typingDot 1.5s infinite;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingDot {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    30% {
        opacity: 1;
        transform: scale(1);
    }
}

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

/* ===============================================
   Input Area
   =============================================== */

.chat-input-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    position: sticky;
    bottom: 0;
    z-index: 100;
}

.input-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.input-field {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem;
    transition: border-color var(--transition-fast);
}

.input-field:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

#messageInput {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    resize: none;
    min-height: 24px;
    max-height: 120px;
    line-height: 1.5;
}

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

.send-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--border-radius-small);
    background: var(--accent);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 1rem;
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow);
}

.send-btn:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.char-count {
    font-weight: 500;
}

.input-hint {
    opacity: 0.7;
}

/* ===============================================
   Modals
   =============================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-overlay.show {
    display: flex;
    animation: modalFadeIn var(--transition-normal) ease;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    box-shadow: 0 20px 40px var(--shadow);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    animation: modalSlideIn var(--transition-normal) ease;
}

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

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: var(--tertiary-bg);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--error);
    color: white;
}

.modal-body {
    padding: 1.5rem;
    max-height: 60vh;
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Rating Section */
.rating-section {
    margin-bottom: 1.5rem;
}

.rating-section p {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.star-rating {
    display: flex;
    gap: 0.25rem;
}

.star {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0.25rem;
    border-radius: 4px;
}

.star:hover,
.star.active {
    color: var(--warning);
    transform: scale(1.1);
}

/* Comment Section */
.comment-section label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.comment-section textarea {
    width: 100%;
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 0.75rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.comment-section textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.char-count-small {
    text-align: right;
    margin-top: 0.5rem;
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Settings */
.setting-group {
    margin-bottom: 1.5rem;
}

.setting-label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 500;
    color: var(--text-primary);
}

.setting-label select,
.setting-label input[type="checkbox"] {
    margin-left: 1rem;
}

.setting-label select {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 0.5rem;
    color: var(--text-primary);
    cursor: pointer;
}

.setting-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-primary:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: var(--tertiary-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--secondary-bg);
    border-color: var(--accent);
}

/* ===============================================
   Toast Notifications
   =============================================== */

.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    box-shadow: 0 8px 24px var(--shadow);
    backdrop-filter: blur(20px);
    max-width: 300px;
    animation: toastSlideIn var(--transition-normal) ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

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

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

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

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

.toast-icon {
    font-size: 1.2rem;
}

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

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

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

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

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 0.25rem 0;
    font-size: var(--font-size-sm);
}

.toast-message {
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    margin: 0;
}

/* ===============================================
   Responsive Design
   =============================================== */

@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
        border: none;
        border-radius: 0;
    }
    
    .chat-header {
        padding: 0 1rem;
    }
    
    .header-text {
        display: none;
    }
    
    .chat-messages {
        padding: 1rem;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    .welcome-message {
        padding: 2rem 1rem;
    }
    
    .welcome-avatar {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .chat-input-container {
        padding: 1rem;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-height: 95vh;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 1rem;
    }
    
    .toast-container {
        left: 1rem;
        right: 1rem;
        top: auto;
        bottom: 140px;
    }
    
    .toast {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .action-btn {
        width: 36px;
        height: 36px;
        font-size: 0.9rem;
    }
    
    .message-bubble {
        padding: 0.75rem 1rem;
    }
    
    .input-field {
        padding: 0.5rem;
    }
    
    .send-btn {
        width: 36px;
        height: 36px;
    }
}

/* ===============================================
   Utility Classes
   =============================================== */

.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-normal) ease;
}

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

.slide-up {
    animation: slideUp var(--transition-normal) ease;
}

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

/* ===============================================
   Dark/Light Theme Toggle
   =============================================== */

.theme-toggle i {
    transition: transform var(--transition-fast);
}

[data-theme="light"] .theme-toggle i::before {
    content: "\f185"; /* sun icon */
}

[data-theme="dark"] .theme-toggle i::before {
    content: "\f186"; /* moon icon */
}