/* =============================================
   NoteBot — Design System
   Based on Pencil MCP design (2026-03-28)
   ============================================= */

:root {
    --bg:             #0F1117;
    --sidebar-bg:     #13161F;
    --surface:        #1A1D2E;
    --surface-hover:  #1E2235;
    --border:         #252A3D;
    --border-light:   #1E2235;
    --primary:        #4D7EFF;
    --primary-dark:   #1A2D5E;
    --primary-hover:  #3D6EEF;
    --text-primary:   #E2E4F0;
    --text-secondary: #8B90AD;
    --text-muted:     #5A5F7A;
    --success:        #22C55E;
    --success-bg:     #0E2A1A;
    --success-border: #1A3A1A;
    --danger:         #EF4444;
    --danger-bg:      #2A0E0E;
    --user-msg:       #1A3060;
    --user-msg-border:#2A4080;
    --user-text:      #E2E8FF;
    --transition:     all 0.2s ease;
    --radius-sm:      6px;
    --radius-md:      10px;
    --radius-lg:      12px;
    --radius-xl:      16px;
}

/* =============================================  RESET & BASE
   ============================================= */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    font-size: 14px;
    line-height: 1.5;
}

button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; }
.hidden { display: none !important; }

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* =============================================
   LAYOUT
   ============================================= */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* =============================================
   SIDEBAR
   ============================================= */
.sidebar {
    width: 270px;
    min-width: 180px;
    max-width: 520px;
    height: 100vh;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease, opacity 0.3s ease;
    overflow: hidden;
    z-index: 200;
    position: relative;
    flex-shrink: 0;
}

.sidebar.no-transition {
    transition: none;
}

.sidebar.collapsed {
    width: 0;
    min-width: 0;
    opacity: 0;
    pointer-events: none;
}

/* Sidebar Header */
.sidebar-header {
    height: 64px;
    min-height: 64px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--border-light);
    flex-shrink: 0;
}

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

.sidebar-logo-icon {
    font-size: 20px;
    color: var(--primary);
}

.sidebar-logo-text {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}

.ai-badge {
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-dark);
    padding: 2px 7px;
    border-radius: var(--radius-sm);
}

/* Sidebar Resize Handle */
.sidebar-resize-handle {
    position: absolute;
    top: 0;
    right: 0;
    width: 5px;
    height: 100%;
    cursor: col-resize;
    z-index: 300;
    transition: background 0.15s;
}

.sidebar-resize-handle:hover,
.sidebar-resize-handle.dragging {
    background: var(--primary);
    opacity: 0.5;
}

/* Sources Section */
.sources-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 16px 12px 8px;
    gap: 4px;
    overflow: hidden;
}

.sources-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4px 8px;
    flex-shrink: 0;
}

.sources-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.source-count-badge {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--surface-hover);
    padding: 2px 7px;
    border-radius: 10px;
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-right: 2px;
}

/* Note / File Item */
.note-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 8px;
    height: 46px;
    border-radius: var(--radius-md);
    cursor: default;
    transition: background 0.15s;
    flex-shrink: 0;
}

.note-item:hover { background: var(--surface-hover); }
.note-item.active { background: var(--surface); }

.note-item-icon {
    width: 28px;
    height: 28px;
    border-radius: 7px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 13px;
}

.note-item-icon.pdf  { background: #2A1A1A; color: #FF6B6B; }
.note-item-icon.md   { background: #1A1F2A; color: #64D2FF; }
.note-item-icon.txt  { background: #1A2A1F; color: #98E4B0; }
.note-item-icon.note { background: var(--primary-dark); color: var(--primary); }

.note-item-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.note-item-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-item-meta {
    font-size: 10px;
    color: var(--text-secondary);
}

.note-delete-btn {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    opacity: 0;
    transition: var(--transition);
    flex-shrink: 0;
    font-size: 12px;
}

.note-item:hover .note-delete-btn { opacity: 1; }
.note-delete-btn:hover { background: var(--danger-bg); color: var(--danger); }

/* Add File Button */
.add-file-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    height: 40px;
    padding: 0 8px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
    flex-shrink: 0;
    margin-top: 4px;
}

.add-file-btn:hover {
    background: var(--surface);
    color: var(--text-primary);
    border-color: var(--primary);
}

/* Sidebar Bottom */
.sidebar-bottom {
    padding: 12px;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex-shrink: 0;
}

.new-note-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    height: 40px;
    padding: 0 12px;
    border-radius: var(--radius-md);
    background: var(--primary-dark);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
}

.new-note-btn:hover { background: #1f3570; }

.settings-row-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    height: 36px;
    padding: 0 8px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    transition: var(--transition);
}

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

/* =============================================
   MAIN CONTENT
   ============================================= */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    overflow: hidden;
    position: relative;
}

/* Sidebar Toggle */
.sidebar-toggle-btn {
    position: absolute;
    top: 16px;
    left: 16px;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: var(--transition);
}

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

/* Chat Header */
.chat-header {
    height: 64px;
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px 0 64px;
    border-bottom: 1px solid var(--border-light);
    flex-shrink: 0;
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-header-icon {
    font-size: 18px;
    color: var(--primary);
}

.chat-title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.chat-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.chat-subtitle {
    font-size: 11px;
    color: var(--text-secondary);
}

.chat-header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Model Selector (inline header) */
.model-selector-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 34px;
    padding: 0 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
}

.model-selector-wrap .model-icon,
.model-selector-wrap .caret-icon {
    font-size: 12px;
    color: var(--text-secondary);
    pointer-events: none;
}

.model-selector-inline {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    max-width: 160px;
}

.model-selector-inline option { background: var(--surface); }

/* Status Badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    background: var(--success-bg);
    font-size: 11px;
    font-weight: 500;
    color: var(--success);
}

.status-badge.error { background: var(--danger-bg); color: var(--danger); }

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--success);
    flex-shrink: 0;
}

.status-badge.error .status-dot { background: var(--danger); }

/* Icon Button */
.icon-btn {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 14px;
    transition: var(--transition);
    background: var(--surface);
    border: 1px solid var(--border);
}

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

/* =============================================
   CHAT MESSAGES
   ============================================= */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Welcome Message */
.welcome-msg {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin: auto;
    padding: 40px 20px;
    max-width: 500px;
    gap: 12px;
}

.welcome-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 4px;
}

.welcome-msg h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.welcome-msg p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.welcome-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-top: 8px;
}

/* Message Row */
.message-row {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    animation: fadeIn 0.3s ease;
}

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

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

/* Bot Avatar */
.bot-avatar {
    width: 34px;
    height: 34px;
    min-width: 34px;
    border-radius: 10px;
    background: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--primary);
}

/* Message Bubble Wrapper */
.msg-bubble-wrap {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-width: 75%;
}

.message-row.user .msg-bubble-wrap {
    align-items: flex-end;
}

/* Bubble */
.msg-bubble {
    padding: 14px 16px;
    border-radius: 12px;
    line-height: 1.65;
    font-size: 14px;
    white-space: pre-wrap;
    word-break: break-word;
}

.message-row.bot .msg-bubble {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 4px 12px 12px 12px;
}

.message-row.user .msg-bubble {
    background: var(--user-msg);
    border: 1px solid var(--user-msg-border);
    color: var(--user-text);
    border-radius: 12px 4px 12px 12px;
}

.msg-bubble.loading {
    color: var(--text-muted);
    font-style: italic;
}

.msg-bubble.error { color: var(--danger); }

/* Source Tags */
.source-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.source-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    background: #0F1A3D;
    color: var(--primary);
    font-size: 11px;
    border: 1px solid #1E2D5E;
}

.source-tag i { font-size: 10px; }

/* Timestamp */
.msg-time {
    font-size: 10px;
    color: var(--text-muted);
    padding: 0 2px;
}

/* =============================================
   INPUT AREA
   ============================================= */
.input-area {
    padding: 12px 20px 20px;
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
}

/* Suggestion Chips */
.suggestion-chips,
.welcome-chips {
    display: flex;
    gap: 8px;
    flex-wrap: nowrap;
    overflow-x: auto;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 12px;
    white-space: nowrap;
    transition: var(--transition);
    flex-shrink: 0;
}

.chip:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    border-color: var(--primary);
}

/* Input Row */
.input-row {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 0 6px 0 16px;
    transition: border-color 0.2s;
}

.input-row:focus-within {
    border-color: var(--primary);
}

.chat-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    resize: none;
    font-size: 14px;
    padding: 14px 0;
    outline: none;
    min-height: 52px;
    max-height: 160px;
    line-height: 1.6;
}

.chat-input::placeholder { color: var(--text-muted); }

.send-btn {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.send-btn:hover { background: var(--primary-hover); transform: scale(1.05); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* =============================================
   MODALS — BASE
   ============================================= */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.55);
    backdrop-filter: blur(6px);
    cursor: pointer;
}

.modal-content {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 560px;
    background: var(--sidebar-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    animation: modalIn 0.25s cubic-bezier(0.16,1,0.3,1);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-lg { max-width: 620px; }
.modal-sm { max-width: 400px; padding: 32px 28px; text-align: center; }

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

/* Modal Header */
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-light);
    flex-shrink: 0;
}

.modal-title-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-title-icon { color: var(--primary); font-size: 18px; }

.modal-close-btn {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-sm);
    background: var(--surface-hover);
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

/* Modal Body */
.modal-body {
    padding: 24px;
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Modal Footer */
.modal-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    padding: 0 24px;
    border-top: 1px solid var(--border-light);
    flex-shrink: 0;
    gap: 10px;
}

.modal-footer-left { display: flex; align-items: center; gap: 6px; }
.modal-footer-right { display: flex; align-items: center; gap: 10px; }

/* =============================================
   FORM ELEMENTS
   ============================================= */
.form-section { display: flex; flex-direction: column; gap: 8px; }

.form-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-hint { font-size: 11px; color: var(--text-secondary); }

.form-label-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.required-badge {
    font-size: 10px;
    font-weight: 600;
    color: #FF6B6B;
    background: #2A1A1A;
    padding: 2px 6px;
    border-radius: 4px;
}

.form-input {
    width: 100%;
    height: 44px;
    padding: 0 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    transition: border-color 0.2s;
    outline: none;
}

.form-input:focus { border-color: var(--primary); }
.form-input::placeholder { color: var(--text-muted); }

/* API Input Row */
.api-input-row {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 0 12px;
    height: 46px;
}

.api-input-row:focus-within { border-color: var(--primary); }

.api-icon { color: var(--text-secondary); font-size: 14px; flex-shrink: 0; }

.api-input-row .form-input {
    height: auto;
    border: none;
    background: transparent;
    padding: 0;
}

.api-input-row .form-input:focus { box-shadow: none; }

.visibility-toggle {
    color: var(--text-secondary);
    font-size: 14px;
    padding: 4px;
    transition: var(--transition);
    flex-shrink: 0;
}

.visibility-toggle:hover { color: var(--text-primary); }

/* Model Options (Settings Modal) */
.model-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.model-loading { color: var(--text-secondary); font-size: 13px; padding: 12px 0; }

.model-option {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 50px;
    padding: 0 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    transition: var(--transition);
}

.model-option:hover { border-color: var(--primary); background: var(--surface-hover); }

.model-option.selected {
    border-color: var(--primary);
    border-width: 1.5px;
    background: var(--primary-dark);
}

.model-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    flex-shrink: 0;
    transition: var(--transition);
}

.model-option.selected .model-dot { background: var(--primary); }

.model-option-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.model-option-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.model-option.selected .model-option-name { color: var(--text-primary); }

.model-option-desc {
    font-size: 11px;
    color: var(--text-secondary);
}

.model-selected-badge {
    font-size: 11px;
    font-weight: 600;
    color: #fff;
    background: var(--primary);
    padding: 3px 8px;
    border-radius: 4px;
}

/* Diag */
.diag-wrap { display: flex; align-items: center; gap: 10px; }

.diag-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    height: 42px;
    padding: 0 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 13px;
    transition: var(--transition);
}

.diag-btn:hover { background: var(--surface-hover); border-color: var(--primary); }

.diag-status-pill {
    margin-left: auto;
    font-size: 11px;
    font-weight: 500;
    padding: 3px 9px;
    border-radius: var(--radius-sm);
}

.diag-status-pill.ok  { background: var(--success-bg); color: var(--success); }
.diag-status-pill.err { background: var(--danger-bg);  color: var(--danger); }

.diag-result {
    margin-top: 4px;
    padding: 10px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* =============================================
   UPLOAD MODAL
   ============================================= */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 32px 20px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--primary);
    background: #0D1020;
}

.drop-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    background: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: var(--primary);
    margin-bottom: 4px;
}

.drop-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.drop-hint { font-size: 12px; color: var(--text-muted); }

.format-badges {
    display: flex;
    gap: 8px;
    margin-top: 4px;
}

.fmt-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
}

.fmt-badge.pdf { color: #FF6B6B; }
.fmt-badge.md  { color: #64D2FF; }
.fmt-badge.txt { color: #98E4B0; }

/* Upload Queue */
.upload-queue { display: flex; flex-direction: column; gap: 8px; }

.queue-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0 4px;
}

.queue-count-badge {
    background: var(--surface-hover);
    color: var(--text-secondary);
    padding: 2px 7px;
    border-radius: 10px;
    font-size: 11px;
    font-weight: 500;
}

.upload-list { display: flex; flex-direction: column; gap: 6px; }

/* Upload Item */
.upload-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface);
}

.upload-item-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 14px;
    height: 52px;
}

.upload-item.done  { background: var(--success-bg); border-color: var(--success-border); }
.upload-item.error { background: var(--danger-bg); border-color: #3A1A1A; }
.upload-item.loading { border-color: var(--primary); }

.upload-item-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--surface-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
}

.upload-item.done  .upload-item-icon { background: var(--success-bg); color: var(--success); }
.upload-item.error .upload-item-icon { background: var(--danger-bg); color: var(--danger); }
.upload-item.loading .upload-item-icon { background: var(--primary-dark); color: var(--primary); }

.upload-item-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.upload-item-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.upload-item-status {
    font-size: 11px;
    color: var(--text-secondary);
}

.upload-item.done  .upload-item-status { color: var(--success); }
.upload-item.error .upload-item-status { color: var(--danger); }

.upload-item-right {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    flex-shrink: 0;
}

.upload-item.done  .upload-item-right { color: var(--success); font-size: 16px; }
.upload-item.error .upload-item-right { color: var(--danger); font-size: 16px; }

.upload-progress-bar {
    height: 4px;
    background: var(--border-light);
    border-radius: 0;
}

.upload-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 0;
    transition: width 0.3s ease;
}

/* =============================================
   NOTE MODAL
   ============================================= */
.title-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.title-input-wrap .form-input { padding-right: 60px; }

.char-count {
    position: absolute;
    right: 12px;
    font-size: 11px;
    color: var(--text-muted);
    pointer-events: none;
}

.content-editor {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 2px;
    height: 38px;
    padding: 0 10px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.toolbar-btn {
    width: 28px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 13px;
    transition: var(--transition);
}

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

.toolbar-divider {
    width: 1px;
    height: 18px;
    background: var(--border);
    margin: 0 4px;
}

.content-textarea {
    width: 100%;
    background: var(--bg);
    border: none;
    color: var(--text-primary);
    resize: none;
    font-size: 13px;
    padding: 14px 16px;
    outline: none;
    line-height: 1.7;
    min-height: 180px;
}

.content-textarea::placeholder { color: var(--text-muted); }

.content-footer-row {
    display: flex;
    justify-content: flex-end;
    padding: 6px 12px;
    background: var(--bg);
    border-top: 1px solid var(--border-light);
}

.content-footer-row .char-count {
    position: static;
    font-size: 11px;
    color: var(--text-muted);
}

/* Tag Input */
.tag-input-area {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    min-height: 44px;
    padding: 8px 12px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: text;
    transition: border-color 0.2s;
}

.tag-input-area:focus-within { border-color: var(--primary); }

.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }

.tag-pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 6px;
    background: var(--primary-dark);
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
}

.tag-pill-remove {
    font-size: 10px;
    cursor: pointer;
    color: var(--primary);
    opacity: 0.7;
    padding: 1px;
}

.tag-pill-remove:hover { opacity: 1; }

.tag-input-field {
    flex: 1;
    min-width: 80px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 13px;
    outline: none;
}

.tag-input-field::placeholder { color: var(--text-muted); }

/* AI Suggest Button */
.btn-ai-suggest {
    display: flex;
    align-items: center;
    gap: 6px;
    height: 34px;
    padding: 0 14px;
    border-radius: var(--radius-md);
    background: #0F1520;
    border: 1px solid #1E2D4A;
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
    transition: var(--transition);
}

.btn-ai-suggest:hover { background: var(--primary-dark); }

/* =============================================
   DELETE MODAL
   ============================================= */
.delete-icon-wrap {
    font-size: 40px;
    color: var(--danger);
    margin-bottom: 12px;
}

.delete-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.delete-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.delete-warn {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.confirm-actions {
    display: flex;
    justify-content: center;
    gap: 10px;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    background: var(--primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

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

.btn-danger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 40px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #EF4444, #B91C1C);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.btn-danger:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(239,68,68,0.35); }

/* =============================================
   TOAST NOTIFICATIONS
   ============================================= */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    background: var(--surface-hover);
    border: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    font-size: 13px;
    color: var(--text-primary);
    pointer-events: auto;
    animation: toastIn 0.3s ease;
    min-width: 240px;
    max-width: 360px;
}

.toast.success { border-color: var(--success-border); }
.toast.success .toast-icon { color: var(--success); }
.toast.error { border-color: #3A1A1A; }
.toast.error .toast-icon { color: var(--danger); }
.toast.info .toast-icon { color: var(--primary); }

.toast-icon { font-size: 15px; flex-shrink: 0; }
.toast-msg { flex: 1; line-height: 1.4; }

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

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

/* =============================================
   RESPONSIVE — MOBILE
   ============================================= */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 500;
        box-shadow: 4px 0 24px rgba(0,0,0,0.4);
    }

    .sidebar.collapsed {
        transform: translateX(-270px);
        width: 270px;
        min-width: 270px;
        opacity: 1;
        pointer-events: none;
    }

    .chat-header { padding-left: 60px; }

    .chat-subtitle { display: none; }

    .msg-bubble-wrap { max-width: 88%; }

    .suggestion-chips { display: none; }

    .model-selector-wrap { display: none; }
}