/* ============================================
   AI Chat - Professional Design System
   ============================================ */

/* ---- CSS Variables ---- */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #1a1a24;
    --bg-hover: #22222e;
    --bg-active: #2a2a38;

    --surface-1: rgba(255, 255, 255, 0.03);
    --surface-2: rgba(255, 255, 255, 0.06);
    --surface-3: rgba(255, 255, 255, 0.09);
    --surface-glass: rgba(17, 17, 24, 0.85);

    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b8;
    --text-tertiary: #6b6b82;
    --text-placeholder: #4a4a60;

    --accent-1: #7c3aed;
    --accent-2: #6366f1;
    --accent-3: #2563eb;
    --accent-glow: rgba(124, 58, 237, 0.25);
    --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #6366f1 50%, #2563eb 100%);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);

    --sidebar-width: 300px;
    --topbar-height: 60px;
    --input-max-height: 200px;

    --family-sans: 'Tajawal', 'Inter', -apple-system, sans-serif;
    --family-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--family-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    direction: rtl;
    line-height: 1.6;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--surface-3);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

::selection {
    background: var(--accent-1);
    color: white;
}

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    height: 100%;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base), width var(--transition-base);
    position: relative;
    z-index: 30;
    flex-shrink: 0;
}

.sidebar.collapsed {
    transform: translateX(100%);
    width: 0;
    overflow: hidden;
    border: none;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    min-height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: var(--accent-gradient);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.logo-icon svg {
    width: 18px;
    height: 18px;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---- Buttons ---- */
.btn-icon {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-icon:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-new-chat {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 12px 16px;
    padding: 12px 16px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: var(--family-sans);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-new-chat::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn-new-chat:hover::before {
    opacity: 1;
}

.btn-new-chat:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-new-chat svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    padding: 10px 24px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: var(--family-sans);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-secondary {
    padding: 10px 24px;
    background: var(--surface-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--family-sans);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--surface-3);
    color: var(--text-primary);
}

/* ---- Sidebar Search ---- */
.sidebar-search {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 16px 8px;
    padding: 8px 12px;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition-fast);
}

.sidebar-search:focus-within {
    border-color: var(--accent-2);
}

.sidebar-search svg {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.sidebar-search input {
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--family-sans);
    font-size: 0.85rem;
    width: 100%;
    outline: none;
}

.sidebar-search input::placeholder {
    color: var(--text-placeholder);
}

/* ---- Conversations List ---- */
.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px;
}

.conversation-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: 10px;
    position: relative;
    margin-bottom: 2px;
}

.conversation-item:hover {
    background: var(--surface-2);
}

.conversation-item.active {
    background: var(--surface-3);
}

.conversation-item .conv-icon {
    width: 18px;
    height: 18px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.conversation-item .conv-title {
    flex: 1;
    font-size: 0.88rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-fast);
}

.conversation-item:hover .conv-title,
.conversation-item.active .conv-title {
    color: var(--text-primary);
}

.conversation-item .conv-actions {
    display: none;
    gap: 2px;
}

.conversation-item:hover .conv-actions {
    display: flex;
}

.conversation-item .conv-actions button {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.conversation-item .conv-actions button:hover {
    background: var(--surface-3);
    color: var(--text-primary);
}

.conversation-item .conv-actions button.delete-btn:hover {
    color: var(--error);
}

.conversation-item .conv-actions button svg {
    width: 14px;
    height: 14px;
}

.conv-date-group {
    padding: 8px 12px 4px;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ---- Sidebar Footer ---- */
.sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding: 8px;
}

.btn-sidebar-action {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--family-sans);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-sidebar-action:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.btn-sidebar-action svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ---- Main Content ---- */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: relative;
    background: var(--bg-primary);
}

/* ---- Top Bar ---- */
.top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    min-height: var(--topbar-height);
    border-bottom: 1px solid var(--border-color);
    background: var(--surface-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 10;
}

.model-selector {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--surface-2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.model-selector:hover {
    background: var(--surface-3);
    border-color: var(--border-hover);
}

.model-name {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-primary);
}

.top-bar-actions {
    margin-right: auto;
}

[dir="rtl"] .top-bar-actions {
    margin-right: 0;
    margin-left: auto;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    background: var(--surface-1);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--error);
    transition: background var(--transition-base);
}

.status-dot.connected {
    background: var(--success);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
    animation: pulse-green 2s infinite;
}

.status-text {
    color: var(--text-secondary);
}

@keyframes pulse-green {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ---- Chat Area ---- */
.chat-area {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    scroll-behavior: smooth;
}

/* ---- Welcome Screen ---- */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: 40px 20px;
    text-align: center;
    animation: fadeInUp 0.6s ease-out;
}

.welcome-screen.hidden {
    display: none;
}

.welcome-icon {
    width: 100px;
    height: 100px;
    margin-bottom: 24px;
    animation: float 4s ease-in-out infinite;
}

.welcome-icon svg {
    width: 100%;
    height: 100%;
}

.welcome-title {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.welcome-subtitle {
    font-size: 1rem;
    color: var(--text-tertiary);
    margin-bottom: 40px;
}

.welcome-suggestions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-width: 600px;
    width: 100%;
}

.suggestion-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: var(--family-sans);
    font-size: 0.88rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: right;
}

.suggestion-card:hover {
    background: var(--surface-2);
    border-color: var(--accent-2);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.suggestion-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}

/* ---- Messages ---- */
.messages-container {
    display: none;
    flex-direction: column;
    padding: 20px;
    max-width: 850px;
    width: 100%;
    margin: 0 auto;
}

.messages-container.active {
    display: flex;
}

.message {
    display: flex;
    gap: 14px;
    margin-bottom: 24px;
    animation: fadeInUp 0.3s ease-out;
    position: relative;
}

.message-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.message.user .message-avatar {
    background: var(--accent-gradient);
    color: white;
}

.message.assistant .message-avatar {
    background: var(--surface-3);
    color: var(--accent-2);
}

.message-avatar svg {
    width: 18px;
    height: 18px;
}

.message-body {
    flex: 1;
    min-width: 0;
}

.message-sender {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.message-content {
    font-size: 0.95rem;
    line-height: 1.75;
    color: var(--text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message-content p {
    margin-bottom: 12px;
}

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

.message-content ul, .message-content ol {
    padding-right: 24px;
    margin-bottom: 12px;
}

.message-content li {
    margin-bottom: 4px;
}

.message-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.message-content a {
    color: var(--accent-2);
    text-decoration: none;
}

.message-content a:hover {
    text-decoration: underline;
}

.message-content blockquote {
    border-right: 3px solid var(--accent-2);
    padding-right: 16px;
    margin: 12px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.88rem;
}

.message-content table th,
.message-content table td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: right;
}

.message-content table th {
    background: var(--surface-2);
    font-weight: 600;
}

.message-content table tr:hover {
    background: var(--surface-1);
}

/* Code blocks */
.message-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin: 12px 0;
    overflow: hidden;
    position: relative;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--surface-2);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.78rem;
    color: var(--text-tertiary);
}

.code-header .lang-tag {
    font-family: var(--family-mono);
    font-weight: 500;
}

.btn-copy-code {
    display: flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-family: var(--family-sans);
    font-size: 0.78rem;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-copy-code:hover {
    background: var(--surface-3);
    color: var(--text-primary);
}

.btn-copy-code svg {
    width: 14px;
    height: 14px;
}

.message-content pre code {
    display: block;
    padding: 16px;
    overflow-x: auto;
    font-family: var(--family-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    direction: ltr;
    text-align: left;
}

.message-content :not(pre) > code {
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--family-mono);
    font-size: 0.85em;
    color: #e879f9;
}

/* Message actions */
.message-actions {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.message-actions button {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all var(--transition-fast);
    font-family: var(--family-sans);
}

.message-actions button:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.message-actions button svg {
    width: 14px;
    height: 14px;
}

/* ---- Typing Indicator ---- */
.typing-indicator {
    display: none;
    align-items: center;
    gap: 14px;
    padding: 12px 20px;
    max-width: 850px;
    width: 100%;
    margin: 0 auto;
}

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

.typing-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: var(--surface-3);
    color: var(--accent-2);
    display: flex;
    align-items: center;
    justify-content: center;
}

.typing-avatar svg {
    width: 18px;
    height: 18px;
}

.typing-dots {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
    background: var(--surface-1);
    border-radius: var(--radius-lg);
}

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

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

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-8px); opacity: 1; }
}

/* ---- Input Area ---- */
.input-area {
    padding: 12px 20px 16px;
    background: linear-gradient(to top, var(--bg-primary) 60%, transparent);
    position: relative;
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    max-width: 850px;
    margin: 0 auto;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 8px 12px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-container:focus-within {
    border-color: var(--accent-2);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.input-container textarea {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--family-sans);
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: var(--input-max-height);
    padding: 6px 4px;
}

.input-container textarea::placeholder {
    color: var(--text-placeholder);
}

.input-actions {
    display: flex;
    align-items: center;
}

.btn-send {
    background: var(--accent-gradient) !important;
    color: white !important;
    border-radius: var(--radius-sm) !important;
    transition: all var(--transition-fast) !important;
    opacity: 0.5;
    pointer-events: none;
}

.btn-send.enabled {
    opacity: 1;
    pointer-events: auto;
}

.btn-send.enabled:hover {
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
}

.btn-stop {
    background: var(--error) !important;
    color: white !important;
    border-radius: var(--radius-sm) !important;
    animation: pulse-red 1.5s infinite;
}

@keyframes pulse-red {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}

.input-hint {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 8px;
    max-width: 850px;
    margin-left: auto;
    margin-right: auto;
}

/* ---- Modal ---- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
    animation: fadeIn 0.2s ease-out;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 560px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease-out;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-start;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

[dir="rtl"] .modal-footer {
    justify-content: flex-start;
}

/* ---- Settings Groups ---- */
.settings-group {
    margin-bottom: 24px;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.settings-group h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

.setting-item {
    margin-bottom: 16px;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

.setting-item input[type="url"],
.setting-item input[type="number"],
.setting-item select,
.setting-item textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--family-sans);
    font-size: 0.9rem;
    outline: none;
    transition: border-color var(--transition-fast);
    direction: ltr;
    text-align: left;
}

.setting-item textarea {
    direction: rtl;
    text-align: right;
    resize: vertical;
    font-size: 0.85rem;
    line-height: 1.6;
}

.setting-item input:focus,
.setting-item select:focus,
.setting-item textarea:focus {
    border-color: var(--accent-2);
}

.setting-item input[type="range"] {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--surface-3);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
    margin-top: 4px;
}

.setting-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.setting-hint {
    display: block;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    margin-top: 4px;
}

.setting-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.setting-row select {
    width: auto;
    min-width: 120px;
}

.model-select-wrapper {
    display: flex;
    gap: 8px;
}

.model-select-wrapper select {
    flex: 1;
}

.btn-refresh {
    width: 40px;
    height: 40px;
    background: var(--surface-1);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-refresh:hover {
    background: var(--surface-2);
    color: var(--accent-2);
}

.btn-refresh svg {
    width: 16px;
    height: 16px;
}

.btn-refresh.spinning svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---- Model Dropdown ---- */
.model-dropdown {
    position: fixed;
    top: 60px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    z-index: 50;
    display: none;
    animation: slideDown 0.2s ease-out;
    overflow: hidden;
}

.model-dropdown.active {
    display: block;
}

.model-dropdown-header {
    padding: 10px 16px;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    font-weight: 600;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
}

.model-dropdown-list {
    max-height: 300px;
    overflow-y: auto;
    padding: 4px;
}

.model-dropdown-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.model-dropdown-item:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}

.model-dropdown-item.active {
    color: var(--accent-2);
    background: rgba(99, 102, 241, 0.1);
}

.model-dropdown-item .model-size {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* ---- Toast ---- */
.toast-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.toast {
    padding: 12px 24px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.88rem;
    box-shadow: var(--shadow-md);
    animation: toastIn 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.toast.hiding {
    animation: toastOut 0.3s ease-in forwards;
}

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

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(24px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(16px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(16px); }
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        right: 0;
        top: 0;
        height: 100%;
        z-index: 50;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.collapsed {
        transform: translateX(100%);
    }

    .welcome-suggestions {
        grid-template-columns: 1fr;
    }

    .welcome-title {
        font-size: 1.5rem;
    }

    .messages-container {
        padding: 12px;
    }

    .message {
        gap: 10px;
    }

    .top-bar {
        padding: 8px 12px;
    }

    .input-area {
        padding: 8px 12px 12px;
    }
}

@media (max-width: 480px) {
    :root {
        --sidebar-width: 280px;
    }

    .welcome-icon {
        width: 70px;
        height: 70px;
    }

    .modal {
        max-height: 95vh;
        border-radius: var(--radius-lg);
    }
}

/* ---- Empty State ---- */
.empty-conversations {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
    text-align: center;
}

.empty-conversations svg {
    width: 48px;
    height: 48px;
    margin-bottom: 12px;
    opacity: 0.3;
}

.empty-conversations p {
    font-size: 0.85rem;
}

/* ---- Rename Input ---- */
.rename-input {
    background: var(--surface-1);
    border: 1px solid var(--accent-2);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: var(--family-sans);
    font-size: 0.88rem;
    padding: 2px 6px;
    width: 100%;
    outline: none;
}