/* Chat Layout */
:root {
    --chat-bg: #1c1e22;
    --sidebar-bg: #111316;
    --sidebar-text: #d1d5db;
    --sidebar-hover: #1f2227;
    --sidebar-active: #2a2e35;
    --primary-color: #ffa600;
    --primary-hover: #e09400;
    --primary-light: #2a1f00;
    --primary-mid: #3a2a00;
    --user-msg-bg: #ffa600;
    --user-msg-text: #1a0a00;
    --assistant-msg-bg: #23272e;
    --assistant-msg-text: #e2e8f0;
    --top-bar-height: 56px;
    --border-color: #2e3138;
    --text-muted: #6b7280;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* Chat Layout Container */
.chat-layout {
    display: flex;
    height: 100%;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease;
    z-index: 100;
}

.sidebar-header {
    padding: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-toggle {
    display: none;
}

.btn-new-chat {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    background: var(--primary-color);
    border: none;
    color: white;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-new-chat:hover {
    background: var(--primary-hover);
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.conversation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.1s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

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

.conversation-title {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 14px;
}

.conversation-delete {
    opacity: 0;
    background: none;
    border: none;
    color: rgba(255,255,255,0.5);
    cursor: pointer;
    padding: 4px 5px;
    border-radius: 5px;
    transition: background 0.12s, color 0.12s, opacity 0.12s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.conversation-item:hover .conversation-delete {
    opacity: 1;
}

.conversation-delete:hover {
    background: rgba(239, 68, 68, 0.18);
    color: #f87171;
}

.no-chats {
    padding: 20px;
    text-align: center;
    color: rgba(255,255,255,0.4);
    font-size: 13px;
}

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

/* Top Bar */
.top-bar {
    height: var(--top-bar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--assistant-msg-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.top-bar-left, .top-bar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-muted);
}

.chat-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: #e2e8f0;
}

/* Model Selector */
.model-selector-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
}

.model-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.model-select {
    appearance: none;
    background: var(--assistant-msg-bg) 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='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E") no-repeat right 10px center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 30px 6px 12px;
    font-size: 13px;
    font-weight: 500;
    color: #e2e8f0;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
    min-width: 160px;
}

.model-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 166, 0, 0.15);
}

.model-select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Regenerate button */
.regenerate-bar {
    max-width: 800px;
    margin: 0 auto 16px;
    padding: 0 24px;
    display: flex;
    justify-content: center;
}

.regenerate-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: 1px solid var(--border-color);
    background: var(--assistant-msg-bg);
    color: #9ca3af;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
    box-shadow: var(--shadow-sm);
}

.regenerate-btn:hover:not(:disabled) {
    background: #2e3138;
    border-color: #4b5563;
    box-shadow: var(--shadow-md);
}

.regenerate-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Chat Area */
.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px 0;
    scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
}

.welcome-icon {
    margin-bottom: 24px;
    color: var(--primary-color);
}

.welcome-screen h1 {
    font-size: 24px;
    font-weight: 600;
    color: #e2e8f0;
    margin-bottom: 8px;
}

.welcome-screen p {
    font-size: 15px;
}

.suggested-prompts {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    max-width: 760px;
}

.prompt-chip {
    border: 1px solid rgba(255, 166, 0, 0.25);
    background: var(--assistant-msg-bg);
    color: #fbbf24;
    border-radius: 999px;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.prompt-chip:hover {
    background: var(--primary-mid);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Chat Footer */
.chat-footer {
    padding: 16px 24px;
    background: var(--assistant-msg-bg);
    border-top: 1px solid var(--border-color);
}

/* User Menu */
.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-name {
    font-size: 14px;
    font-weight: 500;
    color: #d1d5db;
}

/* Message Bubbles */
.message-bubble {
    display: flex;
    padding: 0 24px;
    margin-bottom: 20px;
}

/* Assistant — left aligned */
.assistant-message {
    justify-content: flex-start;
}

.assistant-message .bubble-body {
    max-width: 80%;
}

/* User — right aligned */
.user-message {
    justify-content: flex-end;
}

.user-message .bubble-body {
    max-width: 80%;
}

/* Attached images rendered inside a user message via markdown image syntax */
.message-content img {
    display: block;
    max-width: 220px;
    max-height: 160px;
    height: auto;
    width: auto;
    margin-top: 8px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    cursor: zoom-in;
    transition: opacity 0.15s;
}

.message-content img:hover {
    opacity: 0.88;
}

/* ── Image / Document modal ── */
.img-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.78);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 24px;
    animation: fadeInBackdrop 0.15s ease;
}

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

.img-modal-inner {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.img-modal-inner img {
    max-width: 90vw;
    max-height: 80vh;
    width: auto;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: 0 24px 64px rgba(0,0,0,0.5);
    display: block;
}

.img-modal-close {
    position: absolute;
    top: -14px;
    right: -14px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.25);
    color: white;
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s;
}

.img-modal-close:hover {
    background: rgba(255,255,255,0.28);
}

/* Shared bubble body */
.bubble-body {
    display: flex;
    flex-direction: column;
}

/* Headers */
.message-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.assistant-message .message-header {
    color: var(--text-muted);
    justify-content: flex-start;
}

.user-message .message-header {
    color: rgba(26, 10, 0, 0.5);
    justify-content: flex-end;
}

/* Bubble content */
.message-content {
    padding: 12px 16px;
    font-size: inherit;
    line-height: 1.6;
    word-wrap: break-word;
}

.user-message .message-content {
    background: var(--user-msg-bg);
    color: var(--user-msg-text);
    border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg);
}

.assistant-message .message-content {
    background: var(--assistant-msg-bg);
    color: var(--assistant-msg-text);
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

/* Footer with copy button — sits below the content bubble */
.message-footer {
    display: flex;
    gap: 5px;
    margin-top: 4px;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.assistant-message .message-footer {
    justify-content: flex-start;
    padding-left: 4px;
}

.user-message .message-footer {
    justify-content: flex-end;
    padding-right: 4px;
}

.message-bubble:hover .message-footer {
    opacity: 1;
}

.message-copy-btn {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--assistant-msg-bg);
    color: #6b7280;
    border-radius: 8px;
    padding: 0;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
    flex-shrink: 0;
}

.message-copy-btn svg {
    width: 13px;
    height: 13px;
    display: block;
    flex-shrink: 0;
}

.message-copy-btn:hover {
    background: #2e3138;
    color: #e2e8f0;
    border-color: #4b5563;
    transform: scale(1.08);
}

.message-copy-btn.copied {
    background: #052e16;
    color: #4ade80;
    border-color: #166534;
}

/* User bubble copy btn tinted to match */
.user-message .message-copy-btn {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,166,0,0.2);
    color: rgba(26,10,0,0.6);
}

.user-message .message-copy-btn:hover {
    background: white;
    color: #92470a;
    border-color: rgba(255,166,0,0.45);
}

.user-message .message-copy-btn.copied {
    background: #052e16;
    color: #4ade80;
    border-color: #166534;
}

.message-delete-btn {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--assistant-msg-bg);
    color: #6b7280;
    border-radius: 8px;
    padding: 0;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
    flex-shrink: 0;
}

.message-delete-btn svg {
    width: 13px;
    height: 13px;
    display: block;
    flex-shrink: 0;
}

.message-delete-btn:hover {
    background: #2d0a0a;
    color: #f87171;
    border-color: #7f1d1d;
    transform: scale(1.08);
}

.user-message .message-delete-btn {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,166,0,0.2);
    color: rgba(26,10,0,0.6);
}

.user-message .message-delete-btn:hover {
    background: #2d0a0a;
    color: #f87171;
    border-color: #7f1d1d;
}

/* Edit icon button — same base shape as copy/delete */
.message-edit-btn {
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255,255,255,0.1);
    background: var(--assistant-msg-bg);
    color: #6b7280;
    border-radius: 8px;
    padding: 0;
    cursor: pointer;
    transition: background 0.15s, color 0.15s, border-color 0.15s, transform 0.1s;
    flex-shrink: 0;
}

.message-edit-btn svg {
    width: 13px;
    height: 13px;
    display: block;
    flex-shrink: 0;
}

.message-edit-btn:hover {
    background: #2a1f00;
    color: #fbbf24;
    border-color: #92400e;
    transform: scale(1.08);
}

.user-message .message-edit-btn {
    background: rgba(255,255,255,0.15);
    border-color: rgba(255,166,0,0.2);
    color: rgba(26,10,0,0.6);
}

.user-message .message-edit-btn:hover {
    background: #2a1f00;
    color: #fbbf24;
    border-color: #92400e;
}

/* Inline edit mode */
.message-edit-area {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.message-edit-textarea {
    width: 100%;
    padding: 10px 14px;
    font-size: 15px;
    line-height: 1.6;
    font-family: inherit;
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    background: #1a1400;
    color: #e2e8f0;
    resize: vertical;
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 166, 0, 0.12);
    transition: border-color 0.15s, box-shadow 0.15s;
    box-sizing: border-box;
}

.message-edit-textarea:focus {
    border-color: var(--primary-hover);
    box-shadow: 0 0 0 3px rgba(255, 166, 0, 0.2);
}

.user-message .message-edit-textarea {
    background: rgba(0,0,0,0.25);
}

.message-edit-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

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

.assistant-message .message-edit-actions {
    justify-content: flex-start;
}

.message-edit-send {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
}

.message-edit-send svg {
    width: 13px;
    height: 13px;
    display: block;
}

.message-edit-send:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: scale(1.02);
}

.message-edit-send:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.message-edit-cancel {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--assistant-msg-bg);
    color: #9ca3af;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.message-edit-cancel svg {
    width: 13px;
    height: 13px;
    display: block;
}

.message-edit-cancel:hover {
    background: #2e3138;
    border-color: #4b5563;
}

.markdown-body > :first-child {
    margin-top: 0;
}

.markdown-body > :last-child {
    margin-bottom: 0;
}

.message-content pre {
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
    font-size: 13px;
    font-family: 'Cascadia Code', 'Fira Code', Consolas, monospace;
}

.message-content code {
    font-family: 'Cascadia Code', 'Fira Code', Consolas, monospace;
}

.message-content :not(pre) code {
    background: rgba(255,255,255,0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.message-content p {
    margin: 0 0 8px 0;
}

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

.message-content strong {
    font-weight: 600;
}

.message-content em {
    font-style: italic;
}

.message-content ul, .message-content ol {
    margin: 8px 0;
    padding-left: 24px;
}

.message-content li {
    margin: 4px 0;
}

.message-content blockquote {
    margin: 8px 0;
    padding-left: 12px;
    border-left: 3px solid rgba(255, 166, 0, 0.4);
    color: #9ca3af;
}

.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 14px;
}

.message-content th,
.message-content td {
    padding: 8px 10px;
    border: 1px solid rgba(148, 163, 184, 0.24);
}

.message-content th {
    background: rgba(255, 255, 255, 0.06);
    font-weight: 700;
}

.message-model-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 166, 0, 0.12);
    color: #fbbf24;
    border: 1px solid rgba(255, 166, 0, 0.25);
    border-radius: 999px;
    padding: 1px 8px;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.3px;
    text-transform: none;
}

.message-time {
    color: rgba(255,255,255,0.5);
    font-weight: 400;
    text-transform: none;
    letter-spacing: 0;
    font-size: 10px;
}

/* Streaming cursor */
.streaming .cursor {
    display: inline-block;
    width: 2px;
    height: 1em;
    background: currentColor;
    animation: blink 1s step-end infinite;
    vertical-align: middle;
    margin-left: 2px;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* Chat Input */
.chat-input-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background: var(--assistant-msg-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.chat-input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 166, 0, 0.15);
}

.chat-input {
    flex: 1;
    border: none;
    background: transparent;
    resize: none;
    font-size: 15px;
    line-height: 1.5;
    outline: none;
    font-family: inherit;
    max-height: 200px;
    min-height: 24px;
    padding: 4px 0;
    color: #e2e8f0;
    caret-color: var(--primary-color);
    overflow-y: auto;
}

.chat-input:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.send-btn {
    background: var(--primary-color);
    border: none;
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #1a0a00;
    transition: background 0.15s;
    flex-shrink: 0;
}

.send-btn:hover:not(:disabled) {
    background: var(--primary-hover);
}

.send-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.stop-btn {
    background: #c0392b;
    color: #fff;
}

.stop-btn:hover {
    background: #e74c3c;
}

.chat-input-hint {
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

/* File Upload Zone */
.file-upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
    transition: border-color 0.15s, background 0.15s;
    margin-bottom: 8px;
    cursor: pointer;
}

/* Hide the native file-input buttons; interaction goes through the label / attach icon */
.file-upload-input,
.attach-input {
    display: none !important;
}

.file-upload-zone.dragging {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.04);
}

.file-upload-content {
    pointer-events: none;
}

.upload-icon {
    color: var(--text-muted);
    margin-bottom: 8px;
}

.upload-text {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
}

.browse-link {
    color: var(--primary-color);
    text-decoration: underline;
    cursor: pointer;
}

.upload-hint {
    margin: 4px 0 0;
    font-size: 11px;
    color: #9ca3af;
}

/* Attached Files */
.attached-files {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 4px;
}

.file-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--chat-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 12px;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.file-chip:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(255,166,0,0.15);
}

.file-chip-preview {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: 4px;
    flex-shrink: 0;
    cursor: zoom-in;
}

.file-chip-icon {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.file-name {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-remove {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 14px;
    padding: 0 2px;
    line-height: 1;
}

.file-remove:hover {
    color: #ef4444;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: var(--top-bar-height);
        left: 0;
        bottom: 0;
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-md);
    }

    .mobile-menu-btn {
        display: block;
    }

    .message-bubble {
        padding: 0 16px;
    }

    .welcome-screen h1 {
        font-size: 20px;
    }

    .chat-footer {
        padding: 12px 16px;
    }
}

/* Scrollbar Styling */
.chat-area::-webkit-scrollbar,
.conversation-list::-webkit-scrollbar {
    width: 6px;
}

.chat-area::-webkit-scrollbar-track,
.conversation-list::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb,
.conversation-list::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
}

.chat-area::-webkit-scrollbar-thumb:hover,
.conversation-list::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}