:root {
  --bg: #eef3f8;
  --panel: rgba(255, 255, 255, 0.76);
  --panel-strong: #ffffff;
  --panel-border: rgba(18, 51, 90, 0.14);
  --text: #10243e;
  --muted: #667995;
  --accent: #12335a;
  --accent-2: #1d6fd1;
  --success: #1f8f59;
  --danger: #c83c4c;
  --shadow: 0 18px 48px rgba(16, 36, 62, 0.12);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(circle at top left, rgba(29, 111, 209, 0.14), transparent 28%),
    radial-gradient(circle at top right, rgba(18, 51, 90, 0.1), transparent 24%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  font-family: "Noto Sans SC", sans-serif;
}

button,
input,
textarea,
select {
  font: inherit;
}

.shell {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 20px 56px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 28px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font: 800 1.2rem/1 "Manrope", sans-serif;
  letter-spacing: 0.08em;
  box-shadow: var(--shadow);
}

.eyebrow,
.section-label {
  margin: 0 0 6px;
  color: var(--accent-2);
  font: 700 0.78rem/1 "Manrope", sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand-lockup h1,
.card-head h2 {
  margin: 0;
  font-family: "Manrope", sans-serif;
}

.brand-lockup h1 {
  font-size: clamp(1.8rem, 2vw, 2.4rem);
}

.status-strip {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  padding: 14px 18px;
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  backdrop-filter: blur(12px);
  color: var(--muted);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #b7c2d2;
}

.status-dot.online {
  background: var(--success);
}

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

.status-divider {
  opacity: 0.45;
}

.workspace {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.panel-nav,
.card,
.upload-zone,
.qa-result,
.result-placeholder,
.json-panel,
.history-item {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  background: var(--panel);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.panel-nav {
  padding: 12px;
  display: grid;
  gap: 10px;
  position: sticky;
  top: 20px;
}

.tab-btn {
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  transition: 0.2s ease;
}

.tab-btn:hover,
.tab-btn.active {
  background: linear-gradient(135deg, rgba(18, 51, 90, 0.94), rgba(29, 111, 209, 0.92));
  color: #fff;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.panel-stack {
  display: grid;
  gap: 24px;
}

.card {
  padding: 26px;
}

.card-head p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.7;
}

.inline-head {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 16px;
}

.upload-zone {
  padding: 28px 20px;
  text-align: center;
  border-style: dashed;
  cursor: pointer;
  margin: 20px 0 14px;
}

.upload-zone.drag-over {
  border-color: var(--accent-2);
  background: rgba(29, 111, 209, 0.08);
}

.upload-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 12px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: rgba(18, 51, 90, 0.08);
  color: var(--accent);
  font: 800 1.6rem/1 "Manrope", sans-serif;
}

.upload-label {
  margin: 0;
  font-weight: 700;
}

.upload-hint,
.grade-caption {
  color: var(--muted);
}

.action-row,
.qa-box,
.list-head {
  display: flex;
  gap: 12px;
  align-items: center;
}

.action-row {
  flex-wrap: wrap;
}

.btn {
  border: 0;
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: wait;
  transform: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
}

.btn-secondary,
.btn-ghost {
  background: rgba(18, 51, 90, 0.08);
  color: var(--text);
  font-weight: 700;
}

.btn-sm {
  padding: 10px 12px;
}

.text-input,
.textarea-input,
.select-input {
  width: 100%;
  border: 1px solid rgba(18, 51, 90, 0.16);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  padding: 14px 15px;
}

.textarea-input {
  resize: vertical;
}

.chip-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.chip {
  border: 1px solid rgba(18, 51, 90, 0.16);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--text);
  padding: 10px 14px;
  cursor: pointer;
}

.doc-list,
.history-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.doc-item,
.history-item {
  display: flex;
  gap: 12px;
  align-items: start;
  padding: 16px;
  margin-top: 12px;
}

.doc-item {
  justify-content: space-between;
}

.doc-name {
  font-weight: 700;
}

.doc-type {
  color: var(--muted);
}

.doc-empty,
.history-empty {
  color: var(--muted);
  padding: 18px 4px;
}

.qa-result,
.result-placeholder,
.action-box,
.reply-body,
.reply-subject {
  margin-top: 18px;
  padding: 18px;
}

.qa-answer,
.action-box,
.reply-body,
#resJson {
  white-space: pre-wrap;
  line-height: 1.72;
}

.qa-sources {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.qa-source-chip {
  background: rgba(18, 51, 90, 0.08);
  border-radius: 999px;
  padding: 8px 12px;
  color: var(--muted);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-weight: 700;
}

.field-full {
  margin-top: 16px;
}

.summary-band {
  display: flex;
  align-items: center;
  gap: 16px;
}

.grade-badge {
  min-width: 58px;
  min-height: 58px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  font: 800 1.5rem/1 "Manrope", sans-serif;
  color: #fff;
  background: linear-gradient(135deg, #345d94, #5d95da);
}

.grade-badge.grade-a {
  background: linear-gradient(135deg, #0f8d67, #2dbc8f);
}

.grade-badge.grade-b {
  background: linear-gradient(135deg, #1b6bc7, #58a0ff);
}

.grade-badge.grade-c {
  background: linear-gradient(135deg, #a06b17, #e0ac3c);
}

.grade-badge.grade-d {
  background: linear-gradient(135deg, #9f3847, #de6679);
}

.grade-score {
  font: 800 1.8rem/1 "Manrope", sans-serif;
}

.result-section {
  margin-top: 20px;
}

.result-section h3 {
  margin-bottom: 12px;
  font-family: "Manrope", sans-serif;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.spec-item {
  padding: 14px;
  border-radius: 14px;
  background: rgba(18, 51, 90, 0.06);
}

.spec-key {
  color: var(--muted);
  margin-bottom: 6px;
}

.spec-val {
  font-weight: 700;
}

.json-panel summary {
  cursor: pointer;
  font-weight: 700;
}

#resJson {
  margin: 12px 0 0;
}

.history-body {
  flex: 1;
}

.history-top,
.history-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.history-title {
  font-weight: 700;
}

.history-score,
.history-meta {
  color: var(--muted);
}

.channel-tag {
  border-radius: 999px;
  background: rgba(18, 51, 90, 0.08);
  padding: 3px 10px;
}

.history-action {
  margin-top: 10px;
  line-height: 1.65;
}

.inline-msg {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 12px;
  background: rgba(18, 51, 90, 0.08);
}

.inline-msg.success {
  background: rgba(31, 143, 89, 0.12);
  color: var(--success);
}

.inline-msg.error {
  background: rgba(200, 60, 76, 0.12);
  color: var(--danger);
}

.hidden {
  display: none !important;
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  padding: 12px 16px;
  border-radius: 14px;
  color: #fff;
  background: rgba(16, 36, 62, 0.95);
  transform: translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: 0.2s ease;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 1024px) {
  .workspace,
  .panel-grid {
    grid-template-columns: 1fr;
  }

  .panel-nav {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .shell {
    padding-inline: 14px;
  }

  .topbar,
  .status-strip,
  .panel-nav,
  .action-row,
  .qa-box,
  .inline-head,
  .history-top,
  .history-meta {
    flex-direction: column;
    align-items: stretch;
  }

  .form-grid,
  .spec-grid {
    grid-template-columns: 1fr;
  }

  .panel-nav {
    grid-template-columns: 1fr;
  }
}