/* ═══════════════════════════════════════════════════════
   深圳 AI 外贸助手  ·  Apple-inspired Design System
   ═══════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #f5f5f7;
  --surface:     #ffffff;
  --border:      rgba(0,0,0,0.08);
  --border-med:  rgba(0,0,0,0.12);
  --text-1:      #1d1d1f;
  --text-2:      #424245;
  --text-3:      #86868b;
  --accent:      #0071e3;
  --accent-dark: #0057b3;
  --accent-bg:   #f0f7ff;
  --green:       #30d158;
  --orange:      #ff9f0a;
  --red:         #ff453a;
  --shadow-sm:   0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:   0 4px 16px rgba(0,0,0,.07), 0 1px 4px rgba(0,0,0,.04);
  --radius-sm:   8px;
  --radius:      14px;
  --radius-lg:   18px;
  --transition:  0.22s cubic-bezier(.4,0,.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text-1);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ── Status Bar ── */
.status-bar {
  background: rgba(255,255,255,0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: 36px;
  display: flex;
  align-items: center;
}
.status-inner {
  max-width: 1160px;
  width: 100%;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-3);
}
.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-3);
  flex-shrink: 0;
  transition: background var(--transition), box-shadow var(--transition);
}
.status-dot.online { background: var(--green); box-shadow: 0 0 0 3px rgba(48,209,88,.18); }
.status-dot.offline { background: var(--red); }
.status-sep { opacity: 0.35; }
.mode-mock { color: var(--orange); font-weight: 500; }
.mode-live { color: var(--green); font-weight: 500; }

/* ── Header ── */
.site-header {
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 36px;
  z-index: 99;
}
.header-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-icon {
  width: 36px; height: 36px;
  background: var(--text-1);
  color: #fff;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.brand-name { font-size: 15px; font-weight: 600; letter-spacing: -0.3px; display: block; }
.brand-sub  { font-size: 11px; color: var(--text-3); display: block; margin-top: 1px; }

/* ── Tab Nav ── */
.tab-nav {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border: 1px solid var(--border-med);
  border-radius: 10px;
  padding: 3px;
}
.tab-btn {
  background: transparent; border: none;
  padding: 6px 18px; font-size: 13px; font-weight: 500;
  color: var(--text-3); border-radius: 8px; cursor: pointer;
  transition: all var(--transition); white-space: nowrap;
  font-family: inherit;
}
.tab-btn:hover { color: var(--text-1); background: rgba(0,0,0,.04); }
.tab-btn.active { background: var(--surface); color: var(--text-1); box-shadow: var(--shadow-sm); }

/* ── Main ── */
.main-content {
  max-width: 1160px;
  margin: 0 auto;
  padding: 32px 32px 64px;
}

/* ── Tabs ── */
.tab-panel { display: none; animation: fadeUp .3s ease both; }
.tab-panel.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 860px) { .panel-grid { grid-template-columns: 1fr; } }

/* ── Cards ── */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); }

.card-head { margin-bottom: 22px; }
.card-title { font-size: 17px; font-weight: 600; letter-spacing: -0.4px; }
.card-desc  { font-size: 13px; color: var(--text-3); margin-top: 4px; line-height: 1.5; }

/* ── Upload ── */
.upload-zone {
  border: 1.5px dashed var(--border-med);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 16px;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-bg);
}
.upload-icon { color: var(--text-3); margin-bottom: 10px; transition: color var(--transition); }
.upload-zone:hover .upload-icon { color: var(--accent); }
.upload-label { font-size: 14px; font-weight: 500; color: var(--text-2); }
.upload-hint  { font-size: 12px; color: var(--text-3); margin-top: 4px; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px; border-radius: var(--radius-sm);
  font-size: 13.5px; font-weight: 500; cursor: pointer;
  border: none; transition: all var(--transition);
  white-space: nowrap; font-family: inherit;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(0,113,227,.35); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; }

.btn-ghost { background: transparent; color: var(--text-2); border: 1px solid var(--border-med); }
.btn-ghost:hover { background: var(--bg); color: var(--text-1); border-color: rgba(0,0,0,.18); }
.btn-ghost:disabled { opacity: .5; cursor: not-allowed; }

.btn-wide { width: 100%; justify-content: center; padding: 12px 18px; font-size: 14px; }
.btn-sm   { padding: 6px 13px; font-size: 12.5px; }
.btn-row  { display: flex; gap: 10px; margin-bottom: 20px; }

/* ── Messages ── */
.inline-msg {
  padding: 10px 14px; border-radius: var(--radius-sm);
  font-size: 13px; margin-top: 12px;
  animation: fadeIn .2s ease;
  line-height: 1.5;
}
.inline-msg.success { background: rgba(48,209,88,.1); color: #1a7a3a; border: 1px solid rgba(48,209,88,.2); }
.inline-msg.error   { background: rgba(255,69,58,.08); color: #c0392b; border: 1px solid rgba(255,69,58,.18); }
.inline-msg.info    { background: var(--accent-bg); color: var(--accent-dark); border: 1px solid rgba(0,113,227,.14); }
.hidden { display: none !important; }

@keyframes fadeIn {
  from { opacity:0; transform: translateY(4px); }
  to   { opacity:1; transform: translateY(0); }
}

/* ── Doc List ── */
.doc-list-wrap { margin-top: 20px; }
.section-label {
  font-size: 11px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-3); margin-bottom: 10px;
  display: block;
}
.doc-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.doc-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: var(--radius-sm);
  background: var(--bg); transition: background var(--transition);
  animation: fadeIn .25s ease both;
}
.doc-item:hover { background: #ebebed; }
.doc-icon  { color: var(--text-3); flex-shrink: 0; }
.doc-name  { font-size: 13px; color: var(--text-2); flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.doc-type  { font-size: 11px; color: var(--text-3); background: rgba(0,0,0,.05); padding: 2px 6px; border-radius: 4px; flex-shrink: 0; }
.doc-empty { font-size: 13px; color: var(--text-3); padding: 12px 0; }

/* ── Q&A ── */
.qa-input-wrap { display: flex; gap: 10px; margin-bottom: 20px; }
.qa-input-wrap .text-input { flex: 1; }

.qa-result {
  background: var(--bg); border-radius: var(--radius);
  padding: 18px; margin-bottom: 20px;
  animation: fadeIn .25s ease both;
}
.qa-answer { font-size: 14px; color: var(--text-1); line-height: 1.75; white-space: pre-wrap; }
.qa-sources { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.qa-source-chip {
  font-size: 11px; color: var(--text-3);
  background: rgba(0,0,0,.05); padding: 3px 9px;
  border-radius: 20px;
}

/* ── Chips ── */
.sample-wrap { margin-top: 18px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.chip {
  font-size: 12.5px; color: var(--accent);
  background: var(--accent-bg);
  border: 1px solid rgba(0,113,227,.14);
  border-radius: 20px; padding: 5px 13px;
  cursor: pointer; transition: all var(--transition);
  font-family: inherit;
}
.chip:hover { background: var(--accent); color: #fff; border-color: transparent; transform: translateY(-1px); }

/* ── Form ── */
.form-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 500px) { .form-grid-2 { grid-template-columns: 1fr; } }

.form-field { display: flex; flex-direction: column; gap: 5px; }
.field-label { font-size: 12px; font-weight: 500; color: var(--text-3); }
.required { color: var(--red); }

.text-input, .select-input, .textarea-input {
  background: var(--bg);
  border: 1.5px solid var(--border-med);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font-size: 14px; color: var(--text-1);
  font-family: inherit;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none; width: 100%; -webkit-appearance: none;
}
.text-input::placeholder, .textarea-input::placeholder { color: var(--text-3); }
.text-input:focus, .select-input:focus, .textarea-input:focus {
  border-color: var(--accent); background: #fff;
  box-shadow: 0 0 0 3px rgba(0,113,227,.1);
}
.textarea-input { resize: vertical; line-height: 1.6; }

/* ── Inquiry Result ── */
.result-card { display: flex; flex-direction: column; }
.result-placeholder {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 14px; color: var(--text-3);
  font-size: 13px; text-align: center;
  padding: 40px 20px; min-height: 280px;
}

.inq-result { animation: fadeIn .3s ease both; }

.result-header {
  display: flex; align-items: center; gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}
.grade-block { display: flex; align-items: center; gap: 14px; }
.grade-badge {
  width: 48px; height: 48px; border-radius: 12px;
  font-size: 22px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; letter-spacing: -1px;
}

/* Grade colors */
.grade-badge.grade-a, .grade-a { background: rgba(48,209,88,.15); color: #1a7a3a; }
.grade-badge.grade-b, .grade-b { background: rgba(0,113,227,.12); color: #004a99; }
.grade-badge.grade-c, .grade-c { background: rgba(255,159,10,.15); color: #a05800; }
.grade-badge.grade-d, .grade-d { background: rgba(255,69,58,.1);   color: #c0392b; }

.grade-sm { width: 32px; height: 32px; border-radius: 8px; font-size: 14px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }

.grade-score { font-size: 20px; font-weight: 700; letter-spacing: -0.5px; }
.grade-label { font-size: 12px; color: var(--text-3); margin-top: 2px; }

.result-section { margin-bottom: 22px; }
.result-section-title {
  font-size: 11px; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-3); margin-bottom: 10px;
}
.action-box {
  background: var(--accent-bg);
  border: 1px solid rgba(0,113,227,.12);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  font-size: 13.5px; color: var(--accent-dark);
  line-height: 1.55;
}

.spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.spec-item { background: var(--bg); border-radius: var(--radius-sm); padding: 10px 13px; }
.spec-key  { font-size: 11px; color: var(--text-3); font-weight: 500; margin-bottom: 3px; }
.spec-val  { font-size: 13.5px; color: var(--text-1); font-weight: 500; }

.reply-subject {
  font-size: 13px; font-weight: 600; color: var(--text-2);
  margin-bottom: 10px; padding: 8px 12px;
  background: var(--bg); border-radius: 6px;
}
.reply-body {
  background: var(--bg); border-radius: var(--radius-sm);
  padding: 14px; font-size: 13px; color: var(--text-2);
  white-space: pre-wrap; line-height: 1.7;
  max-height: 240px; overflow-y: auto; margin-bottom: 10px;
}

.raw-details {
  border-top: 1px solid var(--border);
  padding-top: 14px; margin-top: 8px;
}
.raw-details summary {
  font-size: 12px; color: var(--text-3);
  cursor: pointer; user-select: none;
  list-style: none; display: flex; align-items: center; gap: 6px;
}
.raw-details summary::-webkit-details-marker { display: none; }
.raw-details summary::before { content: '▶'; font-size: 9px; transition: transform .2s; }
.raw-details[open] summary::before { transform: rotate(90deg); }
.raw-json {
  margin-top: 12px; background: #1d1d1f; color: #a8e5a0;
  padding: 14px; border-radius: var(--radius-sm);
  font-size: 11.5px; overflow-x: auto; line-height: 1.65;
  white-space: pre; font-family: 'SF Mono', Menlo, Consolas, monospace;
}

/* ── History ── */
.history-toolbar {
  display: flex; align-items: center;
  justify-content: space-between; margin-bottom: 20px;
}
.history-item {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px;
  margin-bottom: 10px; box-shadow: var(--shadow-sm);
  animation: fadeIn .25s ease both;
  transition: box-shadow var(--transition), transform var(--transition);
  cursor: default;
}
.history-item:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
.history-body { flex: 1; min-width: 0; }
.history-top { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 5px; }
.history-title { font-size: 14.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.history-score { font-size: 18px; font-weight: 700; letter-spacing: -0.5px; flex-shrink: 0; }
.history-score small { font-size: 12px; font-weight: 400; color: var(--text-3); }
.history-meta { font-size: 12.5px; color: var(--text-3); display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.dot { opacity: 0.35; }
.channel-tag { background: rgba(0,0,0,.05); padding: 1px 7px; border-radius: 20px; font-size: 11px; }
.history-action { font-size: 12.5px; color: var(--text-3); margin-top: 7px; line-height: 1.4; }
.history-empty { text-align: center; color: var(--text-3); padding: 60px 0; font-size: 14px; }

/* ── Toast ── */
.toast {
  position: fixed; bottom: 32px; left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(29,29,31,.92); color: #fff;
  padding: 11px 22px; border-radius: 22px;
  font-size: 13px; font-weight: 500;
  opacity: 0; pointer-events: none;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  backdrop-filter: blur(12px); white-space: nowrap; z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── Spinner ── */
.spinner {
  width: 15px; height: 15px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff; border-radius: 50%;
  animation: spin .6s linear infinite; flex-shrink: 0;
}
.btn-ghost .spinner { border: 2px solid rgba(0,0,0,.15); border-top-color: var(--text-2); }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,.14); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,.24); }

/* ── Responsive ── */
@media (max-width: 640px) {
  .header-inner, .status-inner, .main-content { padding-left: 16px; padding-right: 16px; }
  .main-content { padding-top: 20px; padding-bottom: 40px; }
  .tab-btn { padding: 6px 12px; font-size: 12px; }
  .card { padding: 20px; }
  .spec-grid { grid-template-columns: 1fr; }
  .history-item { padding: 14px 16px; }
}