/* ============================================
   AI Assistant — Nordic Minimal Frontend
   配色体系：温暖克制、高级安静
   ============================================ */

/* ── CSS Variables ── */
:root {
  /* 核心色板 — 温暖陶土系 */
  --color-primary:      #C4936A;
  --color-primary-hover:#B07D52;
  --color-primary-light:#E8D4BC;
  --color-primary-faint:#F5EDE3;

  /* 背景层次 */
  --bg-base:    #FAFAF8;
  --bg-surface: #FFFFFF;
  --bg-hover:   #F4F3F0;
  --bg-active:  #EFEDE9;

  /* 边框 */
  --border-light:  #EBEBEA;
  --border-medium: #D8D8D4;

  /* 文字层次 */
  --text-primary:   #1C1C1A;
  --text-secondary:  #6E6E68;
  --text-tertiary:  #A8A8A2;
  --text-inverse:   #FFFFFF;

  /* 功能色 */
  --color-success:  #7A9E7E;
  --color-warning:  #C4936A;
  --color-error:    #B87070;
  --color-info:     #8BA0A8;

  /* 静谧点缀 */
  --dot-color:      #C4936A;

  /* 间距系统 */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  20px;
  --space-6:  24px;
  --space-8:  32px;
  --space-10: 40px;
  --space-12: 48px;

  /* 圆角 */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* 阴影 */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
  --shadow-lg:  0 8px 24px rgba(0,0,0,0.06), 0 4px 8px rgba(0,0,0,0.04);

  /* 过渡 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --transition: 0.2s var(--ease);

  /* 字体 */
  --font-sans: "Inter", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { font-family: var(--font-sans); font-size: 14px; line-height: 1.6; color: var(--text-primary); background: var(--bg-base); min-height: 100vh; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── Typography ── */
.text-xs   { font-size: 11px; }
.text-sm   { font-size: 12px; }
.text-base { font-size: 14px; }
.text-lg   { font-size: 16px; }
.text-xl   { font-size: 18px; }
.text-2xl  { font-size: 22px; }
.text-3xl  { font-size: 28px; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.text-secondary { color: var(--text-secondary); }
.text-tertiary  { color: var(--text-tertiary); }
.text-primary-color { color: var(--color-primary); }

/* ── Layout ── */
.app-layout { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar { width: 220px; min-height: 100vh; background: var(--bg-surface); border-right: 1px solid var(--border-light); display: flex; flex-direction: column; position: fixed; top: 0; left: 0; z-index: 100; transition: transform 0.3s var(--ease); }
.sidebar-brand { padding: var(--space-6) var(--space-6) var(--space-5); border-bottom: 1px solid var(--border-light); }
.sidebar-logo { display: flex; align-items: center; gap: var(--space-3); }
.logo-dot { width: 8px; height: 8px; border-radius: var(--radius-full); background: var(--dot-color); flex-shrink: 0; }
.logo-text { font-size: 15px; font-weight: 600; letter-spacing: -0.3px; color: var(--text-primary); }
.sidebar-nav { flex: 1; padding: var(--space-4) var(--space-3); display: flex; flex-direction: column; gap: 2px; }
.nav-label { font-size: 10px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-tertiary); padding: var(--space-4) var(--space-3) var(--space-2); }
.nav-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); color: var(--text-secondary); font-size: 13.5px; font-weight: 450; transition: all var(--transition); cursor: pointer; position: relative; }
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { background: var(--color-primary-faint); color: var(--color-primary); font-weight: 500; }
.nav-item.active::before { content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%); width: 3px; height: 16px; background: var(--color-primary); border-radius: 0 2px 2px 0; }
.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; opacity: 0.7; }
.nav-item.active svg, .nav-item:hover svg { opacity: 1; }
.nav-divider { height: 1px; background: var(--border-light); margin: var(--space-3) var(--space-3); }
.sidebar-footer { padding: var(--space-4) var(--space-3); border-top: 1px solid var(--border-light); }

/* User card in sidebar */
.user-card { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3); border-radius: var(--radius-md); cursor: pointer; transition: background var(--transition); }
.user-card:hover { background: var(--bg-hover); }
.user-avatar { width: 32px; height: 32px; border-radius: var(--radius-full); background: var(--color-primary-light); color: var(--color-primary); display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 600; flex-shrink: 0; }
.user-info { flex: 1; min-width: 0; }
.user-name { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-plan  { font-size: 11px; color: var(--text-tertiary); }

/* Main content */
.main-content { flex: 1; margin-left: 220px; min-height: 100vh; display: flex; flex-direction: column; }

/* Page header */
.page-header { padding: var(--space-8) var(--space-10) var(--space-6); border-bottom: 1px solid var(--border-light); background: var(--bg-surface); }
.page-title { font-size: 22px; font-weight: 600; letter-spacing: -0.4px; color: var(--text-primary); margin-bottom: var(--space-1); }
.page-desc { font-size: 13px; color: var(--text-secondary); }
.page-body { flex: 1; padding: var(--space-8) var(--space-10); }

/* ── Buttons ── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); padding: var(--space-2) var(--space-5); border-radius: var(--radius-md); font-size: 13.5px; font-weight: 500; transition: all var(--transition); white-space: nowrap; cursor: pointer; border: none; line-height: 1.4; }
.btn svg { width: 15px; height: 15px; flex-shrink: 0; }
.btn-primary { background: var(--color-primary); color: var(--text-inverse); }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-primary:active { transform: scale(0.98); }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary); border: 1px solid var(--border-medium); }
.btn-secondary:hover { background: var(--bg-hover); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-danger { background: transparent; color: var(--color-error); border: 1px solid var(--color-error); }
.btn-danger:hover { background: #fdf0f0; }
.btn-sm { padding: var(--space-1) var(--space-3); font-size: 12px; }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: 14.5px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

/* ── Form Elements ── */
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: 12.5px; font-weight: 500; color: var(--text-secondary); letter-spacing: 0.01em; }
.form-input, .form-textarea, .form-select { width: 100%; padding: var(--space-3) var(--space-4); border: 1px solid var(--border-medium); border-radius: var(--radius-md); background: var(--bg-surface); color: var(--text-primary); font-size: 14px; transition: border-color var(--transition), box-shadow var(--transition); outline: none; }
.form-input::placeholder, .form-textarea::placeholder { color: var(--text-tertiary); }
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-faint); }
.form-textarea { resize: vertical; min-height: 100px; line-height: 1.6; }
.form-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23A8A8A2' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; cursor: pointer; }
.form-hint { font-size: 11.5px; color: var(--text-tertiary); }
.form-error { font-size: 11.5px; color: var(--color-error); }

/* ── Cards ── */
.card { background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); overflow: hidden; }
.card-header { padding: var(--space-5) var(--space-6); border-bottom: 1px solid var(--border-light); display: flex; align-items: center; justify-content: space-between; }
.card-title { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.card-body { padding: var(--space-6); }
.card-footer { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border-light); background: var(--bg-base); }

/* ── Auth Page ── */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg-base); padding: var(--space-6); }
.auth-card { width: 100%; max-width: 400px; background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-xl); padding: var(--space-10) var(--space-8); box-shadow: var(--shadow-md); }
.auth-logo { display: flex; align-items: center; justify-content: center; gap: var(--space-3); margin-bottom: var(--space-8); }
.auth-logo-dot { width: 10px; height: 10px; border-radius: var(--radius-full); background: var(--dot-color); }
.auth-logo-text { font-size: 18px; font-weight: 600; letter-spacing: -0.4px; }
.auth-title { font-size: 20px; font-weight: 600; text-align: center; margin-bottom: var(--space-2); letter-spacing: -0.3px; }
.auth-subtitle { font-size: 13px; color: var(--text-secondary); text-align: center; margin-bottom: var(--space-8); }
.auth-form { display: flex; flex-direction: column; gap: var(--space-5); }
.auth-tabs { display: flex; background: var(--bg-base); border-radius: var(--radius-md); padding: 3px; margin-bottom: var(--space-6); }
.auth-tab { flex: 1; padding: var(--space-2); text-align: center; font-size: 13px; font-weight: 500; border-radius: calc(var(--radius-md) - 2px); color: var(--text-secondary); cursor: pointer; transition: all var(--transition); border: none; background: none; }
.auth-tab.active { background: var(--bg-surface); color: var(--text-primary); box-shadow: var(--shadow-sm); }

/* ── Chat Interface ── */
.chat-body { flex: 1; display: flex; flex-direction: column; min-height: 0; overflow: hidden; }
.chat-messages { flex: 1; overflow-y: auto; padding: var(--space-8) var(--space-10); display: flex; flex-direction: column; gap: var(--space-6); min-height: 0; align-items: stretch; }
.chat-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-4); color: var(--text-tertiary); padding: var(--space-10); margin: auto; }
.chat-empty-icon { width: 40px; height: 40px; border-radius: var(--radius-lg); background: var(--color-primary-faint); display: flex; align-items: center; justify-content: center; }
.chat-empty-icon svg { width: 20px; height: 20px; color: var(--color-primary); }
.chat-empty-title { font-size: 16px; font-weight: 500; color: var(--text-secondary); }
.chat-empty-desc { font-size: 13px; text-align: center; max-width: 300px; line-height: 1.7; }
.message { display: flex; gap: var(--space-4); max-width: 720px; animation: msgIn 0.3s var(--ease-out); }
@keyframes msgIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.message.user { align-self: flex-end; flex-direction: row-reverse; }
.message.assistant { align-self: flex-start; }
.msg-avatar { width: 32px; height: 32px; border-radius: var(--radius-full); flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 11px; font-weight: 600; }
.msg-avatar.user { background: var(--color-primary-light); color: var(--color-primary); }
.msg-avatar.assistant { background: var(--bg-active); color: var(--text-secondary); }
.msg-content { flex: 1; min-width: 0; }
.msg-bubble { padding: var(--space-4) var(--space-5); border-radius: var(--radius-lg); line-height: 1.7; font-size: 14px; white-space: pre-wrap; word-break: break-word; }
.message.user .msg-bubble { background: var(--color-primary); color: var(--text-inverse); border-bottom-right-radius: var(--radius-sm); }
.message.assistant .msg-bubble { background: var(--bg-surface); border: 1px solid var(--border-light); border-bottom-left-radius: var(--radius-sm); }
.msg-time { font-size: 11px; color: var(--text-tertiary); margin-top: var(--space-1); padding: 0 var(--space-1); }
.msg-ref { margin-top: var(--space-3); padding: var(--space-3) var(--space-4); background: var(--bg-base); border-left: 2px solid var(--color-primary-light); border-radius: 0 var(--radius-md) var(--radius-md) 0; font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; }
.msg-ref-label { font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-tertiary); margin-bottom: var(--space-1); }

/* Chat input area */
.chat-input-area { padding: var(--space-5) var(--space-10) var(--space-8); border-top: 1px solid var(--border-light); background: var(--bg-surface); }

/* ── Task list ── */
.task-item { background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: var(--space-5); margin-bottom: var(--space-4); transition: border-color 0.2s; }
.task-item:hover { border-color: var(--border-medium); }
.task-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-2); flex-wrap: wrap; gap: var(--space-2); }
.task-meta { display: flex; align-items: center; gap: var(--space-2); font-size: 13px; }
.task-dot { font-size: 14px; }
.task-label { font-weight: 500; }
.task-time { color: var(--text-tertiary); font-size: 12px; }
.task-topic { font-size: 13px; color: var(--text-secondary); margin-bottom: var(--space-3); line-height: 1.5; }
.task-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.task-result-content { background: var(--bg-base); border: 1px solid var(--border-light); border-radius: var(--radius-md); padding: var(--space-4); font-size: 13px; line-height: 1.7; white-space: pre-wrap; word-break: break-word; color: var(--text-primary); max-height: 400px; overflow-y: auto; }

/* 状态颜色 */
.status-pending    .task-label { color: var(--text-tertiary); }
.status-processing .task-label { color: var(--color-primary); animation: pulse 1.5s ease-in-out infinite; }
.status-completed  .task-label { color: var(--color-success); }
.status-failed     .task-label { color: var(--color-error); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.chat-input-wrapper { display: flex; align-items: flex-end; gap: var(--space-3); background: var(--bg-base); border: 1px solid var(--border-medium); border-radius: var(--radius-xl); padding: var(--space-3) var(--space-4); transition: border-color var(--transition), box-shadow var(--transition); }
.chat-input-wrapper:focus-within { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-faint); }
.chat-textarea { flex: 1; background: none; border: none; outline: none; resize: none; font-size: 14px; color: var(--text-primary); line-height: 1.6; max-height: 160px; overflow-y: auto; }
.chat-textarea::placeholder { color: var(--text-tertiary); }

/* ── Tabs ── */
.tabs { display: flex; gap: 2px; background: var(--bg-base); border-radius: var(--radius-md); padding: 3px; width: fit-content; margin-bottom: var(--space-6); }
.tab { padding: var(--space-2) var(--space-4); border-radius: calc(var(--radius-md) - 2px); font-size: 13px; font-weight: 500; color: var(--text-secondary); cursor: pointer; transition: all var(--transition); border: none; background: none; white-space: nowrap; }
.tab:hover { color: var(--text-primary); }
.tab.active { background: var(--bg-surface); color: var(--text-primary); box-shadow: var(--shadow-sm); }

/* ── Quota Display ── */
.quota-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--space-4); margin-bottom: var(--space-8); }
.quota-card { background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: var(--space-5) var(--space-6); display: flex; flex-direction: column; gap: var(--space-2); }
.quota-label { font-size: 11.5px; font-weight: 600; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-tertiary); }
.quota-value { font-size: 28px; font-weight: 700; letter-spacing: -0.8px; color: var(--text-primary); line-height: 1; }
.quota-suffix { font-size: 13px; font-weight: 400; color: var(--text-secondary); margin-left: var(--space-1); }
.quota-bar { height: 4px; background: var(--bg-active); border-radius: var(--radius-full); margin-top: var(--space-2); overflow: hidden; }
.quota-bar-fill { height: 100%; border-radius: var(--radius-full); background: var(--color-primary); transition: width 0.6s var(--ease-out); }
.quota-bar-fill.warn { background: var(--color-warning); }
.quota-bar-fill.danger { background: var(--color-error); }
.quota-sub { font-size: 12px; color: var(--text-tertiary); margin-top: var(--space-1); }

/* Plan badge */
.plan-badge { display: inline-flex; align-items: center; padding: 2px var(--space-3); border-radius: var(--radius-full); font-size: 11.5px; font-weight: 600; letter-spacing: 0.03em; }
.plan-badge.free    { background: var(--bg-active); color: var(--text-secondary); }
.plan-badge.basic   { background: #E8F0E8; color: var(--color-success); }
.plan-badge.pro    { background: var(--color-primary-faint); color: var(--color-primary); }
.plan-badge.unlimit{ background: #EAF0F8; color: #5A8FAF; }

/* ── Stats ── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: var(--space-4); margin-bottom: var(--space-8); }
.stat-card { background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: var(--space-5) var(--space-6); }
.stat-value { font-size: 26px; font-weight: 700; letter-spacing: -0.6px; color: var(--text-primary); line-height: 1; margin-bottom: var(--space-1); }
.stat-label { font-size: 12px; color: var(--text-secondary); }

/* ── Table ── */
.table-wrap { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--border-light); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th { padding: var(--space-3) var(--space-5); text-align: left; font-size: 11px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-tertiary); background: var(--bg-base); border-bottom: 1px solid var(--border-light); white-space: nowrap; }
tbody tr { border-bottom: 1px solid var(--border-light); transition: background var(--transition); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--bg-hover); }
tbody td { padding: var(--space-3) var(--space-5); color: var(--text-primary); vertical-align: middle; }

/* ── Status badge ── */
.status-badge { display: inline-flex; align-items: center; gap: var(--space-1); padding: 2px var(--space-2); border-radius: var(--radius-full); font-size: 11px; font-weight: 600; }
.status-badge.pending   { background: #F5F0E8; color: #B08A50; }
.status-badge.processing { background: #EAF0F8; color: #5A8FAF; }
.status-badge.completed { background: #E8F0E8; color: #5A8A5A; }
.status-badge.failed    { background: #F8EBEB; color: var(--color-error); }

/* ── Document list ── */
.doc-list { display: flex; flex-direction: column; gap: var(--space-3); }
.doc-item { display: flex; align-items: center; gap: var(--space-4); padding: var(--space-4) var(--space-5); background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); transition: all var(--transition); cursor: pointer; }
.doc-item:hover { border-color: var(--border-medium); box-shadow: var(--shadow-sm); }
.doc-icon { width: 36px; height: 36px; border-radius: var(--radius-md); background: var(--color-primary-faint); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.doc-icon svg { width: 18px; height: 18px; color: var(--color-primary); }
.doc-info { flex: 1; min-width: 0; }
.doc-title { font-size: 13.5px; font-weight: 500; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.doc-meta { font-size: 11.5px; color: var(--text-tertiary); margin-top: 2px; }
.doc-actions { display: flex; gap: var(--space-2); opacity: 0; transition: opacity var(--transition); }
.doc-item:hover .doc-actions { opacity: 1; }

/* ── Upload Modal ── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.35); display: flex; align-items: flex-start; justify-content: center; z-index: 1000; padding: var(--space-6); overflow-y: auto; animation: fadeIn 0.2s var(--ease-out); }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal { background: var(--bg-surface); border-radius: var(--radius-xl); width: 100%; max-width: 520px; box-shadow: var(--shadow-lg); animation: slideUp 0.25s var(--ease-out); }
@keyframes slideUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.modal-header { padding: var(--space-6) var(--space-8); border-bottom: 1px solid var(--border-light); display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 16px; font-weight: 600; letter-spacing: -0.2px; }
.modal-close { width: 28px; height: 28px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; color: var(--text-tertiary); transition: all var(--transition); cursor: pointer; }
.modal-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.modal-close svg { width: 14px; height: 14px; }
.modal-body { padding: var(--space-6) var(--space-8); }
.modal-footer { padding: var(--space-5) var(--space-8); border-top: 1px solid var(--border-light); display: flex; gap: var(--space-3); justify-content: flex-end; background: var(--bg-base); }

/* ── History list ── */
.history-list { display: flex; flex-direction: column; gap: var(--space-3); }
.history-item { padding: var(--space-4) var(--space-5); background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); cursor: pointer; transition: all var(--transition); }
.history-item:hover { border-color: var(--border-medium); background: var(--bg-hover); }
.history-q { font-size: 13px; font-weight: 500; color: var(--text-primary); margin-bottom: var(--space-1); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-a { font-size: 12.5px; color: var(--text-secondary); line-height: 1.5; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.history-meta { font-size: 11px; color: var(--text-tertiary); margin-top: var(--space-2); }

/* ── Loading ── */
.loading-dots { display: inline-flex; gap: 4px; align-items: center; }
.loading-dots span { width: 5px; height: 5px; border-radius: var(--radius-full); background: var(--text-tertiary); animation: dotBounce 1.2s infinite; }
.loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.loading-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes dotBounce { 0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; } 40% { transform: scale(1); opacity: 1; } }
.spinner { width: 18px; height: 18px; border: 2px solid var(--border-light); border-top-color: var(--color-primary); border-radius: var(--radius-full); animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toast / Notification ── */
.toast-container { position: fixed; top: var(--space-6); right: var(--space-6); z-index: 2000; display: flex; flex-direction: column; gap: var(--space-3); pointer-events: none; }
.toast { background: var(--bg-surface); border: 1px solid var(--border-light); border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5); box-shadow: var(--shadow-md); display: flex; align-items: center; gap: var(--space-3); font-size: 13.5px; max-width: 340px; pointer-events: all; animation: toastIn 0.3s var(--ease-out); }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
.toast.success { border-left: 3px solid var(--color-success); }
.toast.error   { border-left: 3px solid var(--color-error); }
.toast.info    { border-left: 3px solid var(--color-info); }

/* ── Utilities ── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start  { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }
.flex-1 { flex: 1; }
.min-w-0 { min-width: 0; }
.mt-2  { margin-top: var(--space-2); }
.mt-4  { margin-top: var(--space-4); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }
.ml-auto { margin-left: auto; }
.w-full { width: 100%; }
.hidden { display: none; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Empty state ── */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: var(--space-12) var(--space-6); text-align: center; color: var(--text-tertiary); }
.empty-state-icon { width: 48px; height: 48px; border-radius: var(--radius-lg); background: var(--bg-active); display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-4); }
.empty-state-icon svg { width: 22px; height: 22px; }
.empty-state-title { font-size: 15px; font-weight: 500; color: var(--text-secondary); margin-bottom: var(--space-2); }
.empty-state-desc { font-size: 13px; color: var(--text-tertiary); max-width: 280px; line-height: 1.6; }

/* ── Plan selector ── */
.plan-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
.plan-card { padding: var(--space-5); border: 1px solid var(--border-light); border-radius: var(--radius-lg); cursor: pointer; transition: all var(--transition); background: var(--bg-surface); }
.plan-card:hover { border-color: var(--border-medium); }
.plan-card.selected { border-color: var(--color-primary); background: var(--color-primary-faint); }
.plan-card-name { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: var(--space-1); }
.plan-card-desc { font-size: 12px; color: var(--text-secondary); line-height: 1.5; }

/* ── Page transitions ── */
.page { display: none; animation: pageIn 0.25s var(--ease-out); }
.page.active { display: flex; flex-direction: column; flex: 1; min-height: 0; }
@keyframes pageIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }

/* ── Responsive ── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .page-body { padding: var(--space-6) var(--space-6); }
  .page-header { padding: var(--space-6) var(--space-6) var(--space-5); }
  .chat-messages { padding: var(--space-6); }
  .chat-input-area { padding: var(--space-4) var(--space-6) var(--space-6); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .quota-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .plan-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .quota-grid { grid-template-columns: 1fr 1fr; }
}