/**
 * Qwen AI Chat - Frontend Styles
 *
 * @package Qwen_AI_Chat
 */

/* CSS Custom Properties */
:root {
    /* Colors - Light Theme */
    --qwen-primary: #6366f1;
    --qwen-primary-hover: #4f46e5;
    --qwen-primary-light: #e0e7ff;
    --qwen-secondary: #8b5cf6;
    --qwen-success: #10b981;
    --qwen-error: #ef4444;
    --qwen-warning: #f59e0b;

    /* Background Colors */
    --qwen-bg-widget: #ffffff;
    --qwen-bg-header: #f8fafc;
    --qwen-bg-messages: #f1f5f9;
    --qwen-bg-input: #ffffff;
    --qwen-bg-user-message: var(--qwen-primary);
    --qwen-bg-assistant-message: #ffffff;

    /* Text Colors */
    --qwen-text-primary: #1e293b;
    --qwen-text-secondary: #64748b;
    --qwen-text-muted: #94a3b8;
    --qwen-text-inverse: #ffffff;

    /* Border Colors */
    --qwen-border: #e2e8f0;
    --qwen-border-focus: var(--qwen-primary);

    /* Shadows */
    --qwen-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --qwen-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --qwen-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --qwen-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Dimensions */
    --qwen-widget-width: 100%;
    --qwen-widget-height: 600px;
    --qwen-widget-radius: 16px;
    --qwen-avatar-size: 32px;
    --qwen-spacing-xs: 4px;
    --qwen-spacing-sm: 8px;
    --qwen-spacing-md: 16px;
    --qwen-spacing-lg: 24px;
    --qwen-spacing-xl: 32px;

    /* Typography */
    --qwen-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --qwen-font-size-xs: 11px;
    --qwen-font-size-sm: 13px;
    --qwen-font-size-md: 14px;
    --qwen-font-size-lg: 16px;
    --qwen-line-height: 1.5;

    /* Transitions */
    --qwen-transition-fast: 150ms ease;
    --qwen-transition-normal: 250ms ease;
    --qwen-transition-slow: 350ms ease;

    /* Z-index */
    --qwen-z-widget: 999999;
    --qwen-z-overlay: 1000000;
}

/* Dark Theme */
[data-theme="dark"],
.qwen-chat-widget[data-theme="dark"] {
    --qwen-bg-widget: #1e293b;
    --qwen-bg-header: #0f172a;
    --qwen-bg-messages: #0f172a;
    --qwen-bg-input: #334155;
    --qwen-bg-assistant-message: #334155;
    --qwen-text-primary: #f1f5f9;
    --qwen-text-secondary: #94a3b8;
    --qwen-text-muted: #64748b;
    --qwen-border: #334155;
}

/* Auto Theme - System Preference */
@media (prefers-color-scheme: dark) {
    .qwen-chat-widget[data-theme="auto"] {
        --qwen-bg-widget: #1e293b;
        --qwen-bg-header: #0f172a;
        --qwen-bg-messages: #0f172a;
        --qwen-bg-input: #334155;
        --qwen-bg-assistant-message: #334155;
        --qwen-text-primary: #f1f5f9;
        --qwen-text-secondary: #94a3b8;
        --qwen-text-muted: #64748b;
        --qwen-border: #334155;
    }
}

/* Reset */
.qwen-chat-widget,
.qwen-chat-widget *,
.qwen-chat-widget *::before,
.qwen-chat-widget *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Visually Hidden */
.qwen-visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* ==================== Chat Widget Container ==================== */
.qwen-chat-widget {
    position: relative;
    width: var(--qwen-widget-width);
    height: var(--qwen-widget-height);
    max-height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--qwen-bg-widget);
    border-radius: var(--qwen-widget-radius);
    box-shadow: var(--qwen-shadow-xl);
    overflow: hidden;
    font-family: var(--qwen-font-family);
    font-size: var(--qwen-font-size-md);
    line-height: var(--qwen-line-height);
    color: var(--qwen-text-primary);
}

/* Fullscreen Mode */
.qwen-chat-widget.qwen-chat--fullscreen {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    max-height: 100%;
    border-radius: 0;
    z-index: var(--qwen-z-widget);
}

/* ==================== Mobile Styles ==================== */
@media (max-width: 640px) {
    .qwen-chat-widget {
        border-radius: var(--qwen-widget-radius);
    }
}

/* ==================== Header ==================== */
.qwen-chat__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--qwen-spacing-md);
    background: var(--qwen-bg-header);
    border-bottom: 1px solid var(--qwen-border);
    flex-shrink: 0;
}

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

.qwen-chat__logo {
    width: 40px;
    height: 40px;
    color: var(--qwen-primary);
    flex-shrink: 0;
}

.qwen-chat__logo svg {
    width: 100%;
    height: 100%;
}

.qwen-chat__title-group {
    display: flex;
    flex-direction: column;
}

.qwen-chat__title {
    font-size: var(--qwen-font-size-lg);
    font-weight: 600;
    color: var(--qwen-text-primary);
    margin: 0;
    line-height: 1.2;
}

.qwen-chat__subtitle {
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    margin: 0;
}

.qwen-chat__status {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 20px;
    margin-left: auto;
}

.qwen-chat__status-dot {
    width: 8px;
    height: 8px;
    background: var(--qwen-success);
    border-radius: 50%;
    animation: qwen-pulse 2s infinite;
}

.qwen-chat__status-text {
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-success);
    font-weight: 500;
}

@keyframes qwen-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.qwen-chat__controls {
    display: flex;
    gap: var(--qwen-spacing-xs);
}

/* ==================== Buttons ==================== */
.qwen-chat__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--qwen-text-secondary);
    transition: color var(--qwen-transition-fast), background var(--qwen-transition-fast);
    border-radius: 8px;
    padding: 8px;
}

.qwen-chat__btn:hover {
    color: var(--qwen-text-primary);
    background: var(--qwen-border);
}

.qwen-chat__btn:focus-visible {
    outline: 2px solid var(--qwen-primary);
    outline-offset: 2px;
}

.qwen-chat__btn svg {
    width: 20px;
    height: 20px;
}

/* Icon Toggle States */
.qwen-chat__btn--fullscreen .qwen-icon--compress,
.qwen-chat__btn--theme .qwen-icon--sun {
    display: none;
}

.qwen-chat--fullscreen .qwen-chat__btn--fullscreen .qwen-icon--expand {
    display: none;
}

.qwen-chat--fullscreen .qwen-chat__btn--fullscreen .qwen-icon--compress {
    display: block;
}

[data-theme="dark"] .qwen-chat__btn--theme .qwen-icon--moon {
    display: none;
}

[data-theme="dark"] .qwen-chat__btn--theme .qwen-icon--sun {
    display: block;
}

/* Send Button */
.qwen-chat__btn--send {
    width: 44px;
    height: 44px;
    background: var(--qwen-primary);
    color: var(--qwen-text-inverse);
    border-radius: 50%;
    flex-shrink: 0;
}

.qwen-chat__btn--send:hover {
    background: var(--qwen-primary-hover);
    color: var(--qwen-text-inverse);
}

.qwen-chat__btn--send .qwen-icon--loading {
    display: none;
}

.qwen-chat__btn--send.qwen-chat__btn--loading .qwen-icon--send {
    display: none;
}

.qwen-chat__btn--send.qwen-chat__btn--loading .qwen-icon--loading {
    display: block;
}

.qwen-chat__btn--send.qwen-chat__btn--disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Upload Button */
.qwen-chat__btn--upload {
    cursor: pointer;
}

/* Status Bar Buttons */
.qwen-chat__btn--new,
.qwen-chat__btn--theme {
    padding: 6px 10px;
    gap: 4px;
    font-size: var(--qwen-font-size-xs);
}

.qwen-chat__btn--new svg,
.qwen-chat__btn--theme svg {
    width: 16px;
    height: 16px;
}

/* Model Selector */
.qwen-chat__model-selector {
    display: flex;
    align-items: center;
}

.qwen-chat__model-select {
    padding: 6px 10px;
    font-size: var(--qwen-font-size-xs);
    font-family: var(--qwen-font-family);
    color: var(--qwen-text-secondary);
    background: var(--qwen-bg-input);
    border: 1px solid var(--qwen-border);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color var(--qwen-transition-fast), color var(--qwen-transition-fast);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}

.qwen-chat__model-select:hover {
    border-color: var(--qwen-primary);
    color: var(--qwen-text-primary);
}

.qwen-chat__model-select:focus {
    outline: none;
    border-color: var(--qwen-primary);
}

[data-theme="dark"] .qwen-chat__model-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
}

/* ==================== Messages Area ==================== */
.qwen-chat__messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--qwen-spacing-md);
    background: var(--qwen-bg-messages);
    scroll-behavior: smooth;
}

.qwen-chat__messages::-webkit-scrollbar {
    width: 6px;
}

.qwen-chat__messages::-webkit-scrollbar-track {
    background: transparent;
}

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

.qwen-chat__messages::-webkit-scrollbar-thumb:hover {
    background: var(--qwen-text-muted);
}

/* ==================== Message Bubbles ==================== */
.qwen-message {
    display: flex;
    gap: var(--qwen-spacing-sm);
    margin-bottom: var(--qwen-spacing-md);
    animation: qwen-message-in var(--qwen-transition-normal) ease-out;
}

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

.qwen-message__avatar {
    width: var(--qwen-avatar-size);
    height: var(--qwen-avatar-size);
    flex-shrink: 0;
    color: var(--qwen-primary);
}

.qwen-message__avatar svg {
    width: 100%;
    height: 100%;
}

.qwen-message__bubble {
    max-width: 85%;
    padding: var(--qwen-spacing-sm) var(--qwen-spacing-md);
    border-radius: 16px;
    position: relative;
}

.qwen-message--user .qwen-message__bubble {
    background: var(--qwen-bg-user-message);
    color: var(--qwen-text-inverse);
    border-bottom-right-radius: 4px;
}

.qwen-message--assistant .qwen-message__bubble {
    background: var(--qwen-bg-assistant-message);
    color: var(--qwen-text-primary);
    border-bottom-left-radius: 4px;
    box-shadow: var(--qwen-shadow-sm);
}

.qwen-message__content {
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.qwen-message__content p {
    margin: 0 0 8px;
}

.qwen-message__content p:last-child {
    margin-bottom: 0;
}

.qwen-message__time {
    display: block;
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    margin-top: var(--qwen-spacing-xs);
}

.qwen-message--user .qwen-message__time {
    color: rgba(255, 255, 255, 0.7);
    text-align: right;
}

/* Message Actions */
.qwen-message__actions {
    display: flex;
    gap: var(--qwen-spacing-xs);
    margin-top: var(--qwen-spacing-sm);
    padding-top: var(--qwen-spacing-sm);
    border-top: 1px solid var(--qwen-border);
}

.qwen-message__btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: color var(--qwen-transition-fast), background var(--qwen-transition-fast);
}

.qwen-message__btn:hover {
    color: var(--qwen-text-primary);
    background: var(--qwen-border);
}

.qwen-message__btn svg {
    width: 14px;
    height: 14px;
}

/* Message Image */
.qwen-message__image {
    max-width: 100%;
    border-radius: 8px;
    margin-bottom: var(--qwen-spacing-sm);
}

/* ==================== Code Blocks ==================== */
.qwen-message__content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: var(--qwen-spacing-md);
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: var(--qwen-font-size-sm);
    margin: var(--qwen-spacing-sm) 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.qwen-message__content code {
    background: var(--qwen-primary-light);
    color: var(--qwen-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.9em;
}

.qwen-message__content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

/* ==================== Typing Indicator ==================== */
.qwen-typing {
    display: flex;
    gap: var(--qwen-spacing-sm);
    margin-bottom: var(--qwen-spacing-md);
}

.qwen-typing[hidden] {
    display: none;
}

.qwen-typing__avatar {
    width: var(--qwen-avatar-size);
    height: var(--qwen-avatar-size);
    color: var(--qwen-primary);
}

.qwen-typing__avatar svg {
    width: 100%;
    height: 100%;
}

.qwen-typing__indicator {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: var(--qwen-spacing-sm) var(--qwen-spacing-md);
    background: var(--qwen-bg-assistant-message);
    border-radius: 16px;
    border-bottom-left-radius: 4px;
    box-shadow: var(--qwen-shadow-sm);
}

.qwen-typing__indicator span {
    width: 8px;
    height: 8px;
    background: var(--qwen-text-muted);
    border-radius: 50%;
    animation: qwen-typing 1.4s infinite ease-in-out both;
}

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

@keyframes qwen-typing {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.6; }
    40% { transform: scale(1); opacity: 1; }
}

@keyframes qwen-message-in {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== Error Message ==================== */
.qwen-error {
    display: flex;
    align-items: center;
    gap: var(--qwen-spacing-sm);
    padding: var(--qwen-spacing-md);
    background: rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    margin-bottom: var(--qwen-spacing-md);
}

.qwen-error[hidden] {
    display: none;
}

.qwen-error__icon {
    color: var(--qwen-error);
    flex-shrink: 0;
}

.qwen-error__text {
    flex: 1;
    font-size: var(--qwen-font-size-sm);
    color: var(--qwen-error);
    margin: 0;
}

.qwen-error__retry {
    padding: 6px 12px;
    font-size: var(--qwen-font-size-sm);
    color: var(--qwen-error);
    background: transparent;
    border: 1px solid var(--qwen-error);
    border-radius: 4px;
    cursor: pointer;
    transition: background var(--qwen-transition-fast);
}

.qwen-error__retry:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* ==================== Footer / Input Area ==================== */
.qwen-chat__footer {
    padding: var(--qwen-spacing-md);
    background: var(--qwen-bg-widget);
    border-top: 1px solid var(--qwen-border);
    flex-shrink: 0;
}

/* Image Preview */
.qwen-image-preview {
    position: relative;
    margin-bottom: var(--qwen-spacing-sm);
    display: inline-block;
}

.qwen-image-preview[hidden] {
    display: none;
}

.qwen-image-preview__img {
    max-width: 100px;
    max-height: 80px;
    border-radius: 8px;
    object-fit: cover;
}

.qwen-image-preview__remove {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--qwen-error);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
}

.qwen-image-preview__remove svg {
    width: 12px;
    height: 12px;
}

/* Input Form */
.qwen-chat__form {
    display: flex;
    align-items: flex-end;
    gap: var(--qwen-spacing-sm);
}

.qwen-chat__input-wrapper {
    flex: 1;
    display: flex;
    align-items: flex-end;
    gap: var(--qwen-spacing-sm);
    padding: var(--qwen-spacing-sm) var(--qwen-spacing-md);
    background: var(--qwen-bg-input);
    border: 1px solid var(--qwen-border);
    border-radius: 24px;
    transition: border-color var(--qwen-transition-fast);
}

.qwen-chat__input-wrapper:focus-within {
    border-color: var(--qwen-border-focus);
}

.qwen-chat__input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--qwen-text-primary);
    font-family: var(--qwen-font-family);
    font-size: var(--qwen-font-size-md);
    line-height: var(--qwen-line-height);
    resize: none;
    max-height: 120px;
    min-height: 24px;
}

.qwen-chat__input:focus {
    outline: none;
}

.qwen-chat__input::placeholder {
    color: var(--qwen-text-muted);
}

.qwen-chat__char-count {
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    white-space: nowrap;
}

/* Status Bar */
.qwen-chat__status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--qwen-spacing-sm);
    padding-top: var(--qwen-spacing-sm);
}

.qwen-chat__actions {
    display: flex;
    gap: var(--qwen-spacing-xs);
}

.qwen-chat__usage {
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    margin: 0;
}

/* SEO Footer */
.qwen-chat__seo-footer {
    padding: var(--qwen-spacing-sm) var(--qwen-spacing-md);
    background: var(--qwen-bg-header);
    border-top: 1px solid var(--qwen-border);
    text-align: center;
}

.qwen-chat__seo-footer p {
    font-size: var(--qwen-font-size-xs);
    color: var(--qwen-text-muted);
    margin: 0;
}

/* ==================== Toast Notification ==================== */
.qwen-toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 12px 24px;
    background: var(--qwen-text-primary);
    color: var(--qwen-text-inverse);
    font-family: var(--qwen-font-family);
    font-size: var(--qwen-font-size-sm);
    border-radius: 8px;
    box-shadow: var(--qwen-shadow-lg);
    z-index: var(--qwen-z-overlay);
    opacity: 0;
    transition: opacity var(--qwen-transition-fast), transform var(--qwen-transition-fast);
}

.qwen-toast--visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ==================== Inline Chat Mode ==================== */
.qwen-chat-inline {
    position: relative;
    width: 90%;
    max-width: 90%;
    height: 90vh;
    margin: 2vh auto;
    box-sizing: border-box;
}

/* Inline widget - always visible, embedded in page */
.qwen-chat-inline .qwen-chat-widget,
.qwen-chat-widget.qwen-chat-widget--inline {
    position: relative;
    width: 100%;
    height: 100%;
    max-height: 90vh;
    border-radius: var(--qwen-widget-radius);
    box-shadow: var(--qwen-shadow-lg);
}

/* Messages area takes available space in inline mode */
.qwen-chat-inline .qwen-chat__messages,
.qwen-chat-widget--inline .qwen-chat__messages {
    flex: 1;
    min-height: 200px;
    max-height: none;
}

/* Fullscreen for inline mode */
.qwen-chat-inline .qwen-chat-widget.qwen-chat--fullscreen,
.qwen-chat-widget--inline.qwen-chat--fullscreen {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    max-height: 100%;
    border-radius: 0;
    z-index: var(--qwen-z-widget);
}

/* Mobile adjustments for inline mode */
@media (max-width: 640px) {
    .qwen-chat-inline .qwen-chat-widget,
    .qwen-chat-widget.qwen-chat-widget--inline {
        border-radius: var(--qwen-widget-radius);
    }
}

/* Dark theme inheritance for inline container */
.qwen-chat-inline[data-theme="dark"] {
    --qwen-bg-widget: #1e293b;
    --qwen-bg-header: #0f172a;
    --qwen-bg-messages: #0f172a;
    --qwen-bg-input: #334155;
    --qwen-bg-assistant-message: #334155;
    --qwen-text-primary: #f1f5f9;
    --qwen-text-secondary: #94a3b8;
    --qwen-text-muted: #64748b;
    --qwen-border: #334155;
}

/* Error message styling */
.qwen-chat-error {
    padding: var(--qwen-spacing-md, 16px);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #dc2626;
    text-align: center;
    font-family: var(--qwen-font-family, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif);
}