:root {
    --bg: #111827;
    --surface: #1F2937;
    --border: #374151;
    --input-bg: #111827;
    --text-main: #F9FAFB;
    --text-sub: #9CA3AF;

    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --success: #10B981;
    --danger: #EF4444;
    --danger-bg: rgba(239, 68, 68, 0.1);

    --radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.5;
}

.layout {
    display: flex;
    min-height: 100vh;
}

.sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 0.3s ease;
}

.sidebar {
    width: 300px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    z-index: 100;
    transition: transform 0.3s ease;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.3);
}

.sidebar.sidebar-collapsed {
    transform: translateX(-100%);
    box-shadow: none;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.08) 0%, transparent 100%);
}

.sidebar-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.btn-close-sidebar {
    background: none;
    border: none;
    color: var(--text-sub);
    cursor: pointer;
    font-size: 1rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.2s, color 0.2s;
}

.btn-close-sidebar:hover { background: var(--border); color: var(--text-main); }

.sidebar-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
}

.btn-sidebar-action {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, transform 0.1s;
    white-space: nowrap;
}

.btn-sidebar-action:hover {
    background: var(--border);
    border-color: var(--text-sub);
}

.btn-sidebar-action:active {
    transform: scale(0.96);
}

.btn-sidebar-export {
    color: var(--text-sub);
    font-size: 0.7rem;
    padding: 5px 8px;
}

.sidebar-search {
    padding: 10px 12px 6px;
}

.sidebar-search input {
    width: 100%;
    padding: 8px 12px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-main);
    font-size: 0.8rem;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.sidebar-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.sidebar-search input::placeholder {
    color: var(--text-sub);
    opacity: 0.7;
}

.sidebar-footer {
    padding: 8px 16px;
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-sub);
    text-align: center;
}

.sidebar-toggle {
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 101;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.3s, background 0.2s, transform 0.1s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.sidebar-toggle:hover { background: var(--border); }
.sidebar-toggle:active { transform: scale(0.94); }
.sidebar-toggle.sidebar-toggle-hidden { opacity: 0; pointer-events: none; }

.main-content {
    flex: 1;
    margin-left: 300px;
    transition: margin-left 0.3s ease;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.main-content.expanded {
    margin-left: 0;
}

.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.card {
    background: var(--surface);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
}

.collapsible-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.header-left { display: flex; align-items: center; gap: 10px; }
.chevron { transition: transform 0.3s ease; font-size: 0.8rem; color: var(--text-sub); }
.card.collapsed .chevron { transform: rotate(-90deg); }
.card.collapsed .config-content { display: none; }

h2 { margin: 0; font-size: 1.25rem; font-weight: 600; color: var(--text-main); }
label { display: block; font-size: 0.85rem; color: var(--text-sub); margin-bottom: 6px; font-weight: 500; }

input[type="text"], input[type="number"], input[type="password"], select, textarea {
    width: 100%;
    background-color: var(--input-bg);
    color: var(--text-main);
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    box-sizing: border-box;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

.valid-json { border-color: var(--success) !important; }
.invalid-json { border-color: var(--danger) !important; }
.validation-msg { font-size: 0.75rem; float: right; margin-top: 4px; }

.input-status { font-size: 0.75rem; color: var(--primary); opacity: 0; transition: opacity 0.5s; }
textarea { resize: none; min-height: 60px; overflow: hidden; display: block; }
#api-custom { font-family: "Menlo", "Consolas", monospace; color: #a5b4fc; line-height: 1.4; tab-size: 2; }

.thinking-block { margin-bottom: 8px; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.thinking-header { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--input-bg); cursor: pointer; user-select: none; font-size: 0.85rem; color: var(--text-sub); font-weight: 500; }
.thinking-header:hover { background: var(--border); }
.thinking-chevron { transition: transform 0.3s ease; font-size: 0.7rem; }
.thinking-block.collapsed .thinking-chevron { transform: rotate(-90deg); }
.thinking-block.collapsed .thinking-content { display: none; }
.thinking-content { padding: 12px; background: rgba(59, 130, 246, 0.05); border-top: 1px solid var(--border); font-size: 0.9rem; color: var(--text-sub); overflow-wrap: break-word; }
.thinking-content p { margin-top: 0; margin-bottom: 1em; }
.thinking-content p:last-child { margin-bottom: 0; }
.thinking-label { flex: 1; }
.thinking-block.streaming .thinking-header { color: var(--primary); }

.markdown-content { padding: 12px; background-color: transparent; min-height: 40px; overflow-wrap: break-word; }
.markdown-content p { margin-top: 0; margin-bottom: 1em; }
.markdown-content p:last-child { margin-bottom: 0; }
.markdown-content pre { position: relative; background: #282c34; padding: 12px; border-radius: 6px; overflow-x: auto; border: 1px solid var(--border); margin: 10px 0; }

.copy-btn { position: absolute; top: 5px; right: 5px; background-color: rgba(255, 255, 255, 0.1); border: none; color: var(--text-sub); padding: 4px 8px; border-radius: 4px; font-size: 0.75rem; cursor: pointer; transition: background 0.2s, color 0.2s; z-index: 10; }
.copy-btn:hover { background-color: rgba(255, 255, 255, 0.2); color: var(--text-main); }

.markdown-content code { font-family: "Menlo", "Consolas", monospace; font-size: 0.9em; background: rgba(255, 255, 255, 0.1); padding: 2px 4px; border-radius: 4px; }
.markdown-content pre code { background: transparent; padding: 0; color: inherit; border-radius: 0; }
.markdown-content table { border-collapse: collapse; width: 100%; margin: 10px 0; }
.markdown-content th, .markdown-content td { border: 1px solid var(--border); padding: 8px; text-align: left; }
.markdown-content th { background-color: var(--input-bg); }
.markdown-content blockquote { border-left: 4px solid var(--primary); margin: 10px 0; padding-left: 12px; color: var(--text-sub); }
.markdown-content a { color: var(--primary); text-decoration: none; }
.markdown-content h1, .markdown-content h2, .markdown-content h3 { color: #fff; margin-top: 1.5em; margin-bottom: 0.5em; }

.hidden { display: none !important; }
.config-content { margin-top: 24px; }
.config-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.full-width { grid-column: 1 / -1; }
.col-span-2 { grid-column: span 2; }

.toggle-container { display: flex; align-items: center; gap: 10px; margin-top: 10px; padding: 10px; background: var(--input-bg); border-radius: var(--radius); border: 1px solid var(--border); width: fit-content; }

#message-list { display: flex; flex-direction: column; gap: 16px; }
.message-row { display: flex; gap: 12px; align-items: flex-start; animation: fadeIn 0.2s ease-in-out; position: relative; }
.role-wrapper { width: 140px; flex-shrink: 0; }
.content-wrapper { flex-grow: 1; min-width: 0; position: relative; }
.action-buttons { display: flex; flex-direction: row; gap: 6px; margin-top: 6px; }

.btn { border: none; padding: 10px 16px; border-radius: var(--radius); font-weight: 600; cursor: pointer; transition: opacity 0.2s, background-color 0.2s; }
.btn:hover { opacity: 0.9; }
.btn-primary { background-color: var(--primary); color: white; width: 100%; margin-top: 20px; font-size: 1rem; }
.btn-stop { background-color: var(--danger); color: white; width: 100%; margin-top: 20px; font-size: 1rem; }
.btn-secondary { background-color: var(--input-bg); border: 1px solid var(--border); color: var(--text-main); font-weight: normal;}
.btn-secondary:hover { background-color: var(--border); }
.btn-icon { padding: 8px; font-size: 1.1rem; line-height: 1; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;}
.btn-danger { background-color: transparent; color: var(--danger); border: 1px solid transparent; }
.btn-danger:hover { background-color: var(--danger-bg); border-color: var(--danger-bg); }
.btn-regen { background-color: transparent; color: var(--primary); border: 1px solid var(--border); }
.btn-regen:hover { background-color: var(--border); }
.btn-toggle { background-color: transparent; color: var(--text-sub); border: 1px solid var(--border); }
.btn-toggle:hover { background-color: var(--border); color: var(--text-main); }

.btn-clear { background-color: transparent; color: var(--text-sub); border: 1px solid var(--border); }
.btn-clear:hover { background-color: var(--border); color: var(--text-main); }

.image-attachments { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.image-attachment { position: relative; width: 80px; height: 80px; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
.image-attachment img { width: 100%; height: 100%; object-fit: cover; }
.image-attachment .remove-img { position: absolute; top: 2px; right: 2px; background: rgba(0,0,0,0.7); color: var(--danger); border: none; border-radius: 50%; width: 20px; height: 20px; font-size: 12px; cursor: pointer; display: flex; align-items: center; justify-content: center; line-height: 1; }
.image-attachment .remove-img:hover { background: rgba(239, 68, 68, 0.3); }

.generating textarea, .generating .markdown-content { border-color: var(--success); box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.3); }
.generating .markdown-content { border: 1px solid var(--success); border-radius: var(--radius); }

#timer-display { font-family: monospace; font-size: 0.85rem; color: var(--text-sub); margin-left: 10px; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    color: var(--text-main);
    box-shadow: var(--shadow);
    opacity: 0;
    transform: translateX(100%);
    transition: opacity 0.3s, transform 0.3s;
    max-width: 400px;
    word-break: break-word;
}

.toast-visible { opacity: 1; transform: translateX(0); }
.toast-out { opacity: 0; transform: translateX(100%); }

.toast-info { background: var(--surface); border: 1px solid var(--primary); }
.toast-success { background: var(--surface); border: 1px solid var(--success); }
.toast-error { background: var(--surface); border: 1px solid var(--danger); }

.toast-close {
    background: none;
    border: none;
    color: var(--text-sub);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 0 0 0 8px;
    margin-left: auto;
    flex-shrink: 0;
}
.toast-close:hover { color: var(--text-main); }

.content-wrapper.drag-over {
    outline: 2px dashed var(--primary);
    outline-offset: -2px;
    background: rgba(59, 130, 246, 0.05);
}

.image-panel { margin-top: 8px; padding: 10px; background: var(--input-bg); border: 1px solid var(--border); border-radius: var(--radius); }

.image-url-row {
    display: flex;
    gap: 8px;
}

.image-url-row input {
    flex: 1;
    padding: 8px 12px;
    font-size: 0.85rem;
    min-height: auto;
}

.image-url-row button {
    flex-shrink: 0;
    padding: 8px 12px;
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .sidebar {
        width: 280px;
    }
    .main-content {
        margin-left: 0;
        padding: 10px;
        padding-top: 60px;
    }
    .sidebar-toggle {
        opacity: 1;
        pointer-events: auto;
    }
    .sidebar:not(.sidebar-collapsed) ~ .main-content .sidebar-toggle {
        opacity: 0;
        pointer-events: none;
    }
    .container { gap: 16px; }
    .card { padding: 16px; }
    .config-grid { grid-template-columns: 1fr; }
    .col-span-2 { grid-column: span 1; }
    .message-row { flex-wrap: wrap; gap: 8px; }
    .role-wrapper { width: auto; flex-grow: 1; }
    .content-wrapper { width: 100%; flex-basis: 100%; }
    .history-item-actions { opacity: 1; }
}

.drag-handle {
    cursor: grab;
    color: var(--text-sub);
    font-size: 1rem;
    padding: 8px 4px;
    user-select: none;
    touch-action: none;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.drag-handle:hover { opacity: 1; }
.drag-handle:active { cursor: grabbing; }

.message-row.dragging { opacity: 0.5; }
.message-row.drag-over-row { outline: 2px dashed var(--primary); outline-offset: 2px; }

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.history-list::-webkit-scrollbar {
    width: 4px;
}

.history-list::-webkit-scrollbar-track {
    background: transparent;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
    color: var(--text-sub);
    font-size: 0.8rem;
    text-align: center;
    gap: 8px;
}

.history-empty-icon {
    font-size: 2rem;
    opacity: 0.4;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s, transform 0.1s;
    margin-bottom: 2px;
    border: 1px solid transparent;
    position: relative;
}

.history-item:hover {
    background: var(--input-bg);
    border-color: var(--border);
}

.history-item:active {
    transform: scale(0.98);
}

.history-item.active {
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.history-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 3px;
    background: var(--primary);
    border-radius: 0 3px 3px 0;
}

.history-item-content {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
    flex: 1;
}

.history-title {
    font-size: 0.83rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-main);
}

.history-meta {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-date {
    font-size: 0.68rem;
    color: var(--text-sub);
}

.history-msg-count {
    font-size: 0.65rem;
    color: var(--text-sub);
    background: var(--input-bg);
    padding: 1px 6px;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.history-item-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity 0.2s;
    flex-shrink: 0;
    margin-left: 6px;
}

.history-item:hover .history-item-actions { opacity: 1; }

.btn-hist-action {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 5px;
    font-size: 0.75rem;
    color: var(--text-sub);
    border-radius: 4px;
    transition: background 0.2s, color 0.2s;
}

.btn-hist-action:hover { background: var(--border); color: var(--text-main); }
.btn-hist-delete:hover { color: var(--danger); background: var(--danger-bg); }

.btn-sm {
    padding: 6px 10px;
    font-size: 0.75rem;
}