:root {
  --bg: #f3f6f4;
  --ink: #14211d;
  --muted: #66756f;
  --line: #d9e3df;
  --panel: rgba(255, 255, 255, .94);
  --brand: #126854;
  --brand-dark: #0b3a31;
  --brand-soft: #e7f4ef;
  --blue: #1c7f9e;
  --warn: #b56a1a;
  --danger: #b64a45;
  --shadow: 0 18px 48px rgba(20, 33, 29, .09);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100vh;
  overflow: hidden;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255,255,255,.84), rgba(243,246,244,.96)),
    repeating-linear-gradient(90deg, rgba(18,104,84,.045) 0, rgba(18,104,84,.045) 1px, transparent 1px, transparent 30px);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  letter-spacing: 0;
}

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

button {
  cursor: pointer;
}

.app-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  padding: 20px 14px;
  display: grid;
  grid-template-rows: auto auto 1fr;
  gap: 20px;
  background: #10251f;
  color: #f4fbf8;
  overflow-y: auto;
  min-height: 0;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 0 6px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: #b8eadb;
  color: #10251f;
  font-weight: 900;
}

.brand-title {
  font-size: 15px;
  font-weight: 800;
}

.brand-subtitle {
  margin-top: 3px;
  color: rgba(244,251,248,.58);
  font-size: 11px;
}

.nav {
  display: grid;
  gap: 6px;
}

.nav-item {
  height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  color: rgba(244,251,248,.82);
  background: transparent;
  border: 0;
  border-radius: 8px;
  text-align: left;
}

.nav-item.active {
  color: #082018;
  background: #c7f0e4;
  font-weight: 800;
}

.nav-icon {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 7px;
  font-size: 12px;
}

.login-panel {
  align-self: end;
  padding: 12px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px;
  background: rgba(255,255,255,.06);
}

.login-panel label {
  display: grid;
  gap: 6px;
  margin-bottom: 10px;
  color: rgba(244,251,248,.62);
  font-size: 12px;
}

.login-panel input {
  width: 100%;
  height: 34px;
  padding: 0 9px;
  color: #fff;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
}

.login-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.login-state {
  margin-top: 10px;
  color: #b8eadb;
  font-size: 12px;
}

.login-state strong,
.login-state span {
  display: block;
}

.login-state strong {
  color: #f4fbf8;
  font-size: 14px;
}

.login-state span {
  margin-top: 4px;
  color: rgba(244,251,248,.66);
}

.logout-btn {
  width: 100%;
  height: 34px;
  margin-top: 12px;
  color: #f4fbf8;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 8px;
  font-weight: 800;
}

.logout-btn:hover {
  border-color: rgba(255,255,255,.36);
  background: rgba(255,255,255,.13);
}

.main {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: 72px minmax(0, 1fr);
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  background: rgba(255,255,255,.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.topbar h1 {
  margin: 0;
  font-size: 19px;
}

.topbar p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--brand);
  background: var(--brand-soft);
  font-size: 12px;
  font-weight: 700;
}

.status-badge.muted {
  color: var(--muted);
  background: #fbfcfc;
}

.icon-btn, .ghost-btn, .primary-btn {
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font-weight: 800;
}

.icon-btn {
  width: 36px;
  display: grid;
  place-items: center;
}

.ghost-btn {
  padding: 0 12px;
}

.primary-btn {
  padding: 0 15px;
  color: #fff;
  border-color: var(--brand);
  background: var(--brand);
}

.view {
  display: none;
  min-height: 0;
  padding: 20px;
  overflow: hidden;
}

.view.is-visible {
  display: grid;
  height: 100%;
}

.chat-layout {
  grid-template-columns: minmax(240px, 290px) minmax(420px, 1fr);
  gap: 16px;
  min-height: 0;
}

.bubble-body {
  white-space: pre-wrap;
}

.bubble-references {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 12px;
}

.bubble-references-title {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.bubble-references-body {
  display: grid;
  gap: 4px;
}

.bubble-reference-item {
  padding: 2px 0;
}

.bubble-reference-item summary {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--brand-dark);
  font-weight: 600;
  list-style: none;
  user-select: none;
}

.bubble-reference-item summary::-webkit-details-marker { display: none; }
.bubble-reference-item summary::marker { content: ""; }

.bubble-reference-item summary::before {
  content: "▸";
  display: inline-block;
  width: 12px;
  color: var(--muted);
  transition: transform .15s;
}

.bubble-reference-item[open] summary::before {
  transform: rotate(90deg);
}

.bubble-reference-item summary .ref-icon {
  display: inline-block;
  width: 14px;
  text-align: center;
}

.ref-snippet {
  margin-top: 6px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  white-space: pre-wrap;
  line-height: 1.6;
  font-size: 12px;
}

.conversation-panel, .chat-panel, .admin-view, .table-wrap, .usage-board {
  min-width: 0;
  min-height: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.conversation-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.panel-head, .section-toolbar {
  min-height: 62px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.panel-head.compact {
  min-height: 56px;
}

.panel-head h2, .section-toolbar h2 {
  margin: 0;
  font-size: 15px;
}

.panel-head p, .section-toolbar p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.session-list, .reference-list {
  display: block;
  overflow-y: auto;
  min-height: 0;
}

.session-item {
  display: flex;
  align-items: stretch;
  border-top: 1px solid var(--line);
  background: transparent;
}

.session-item.active {
  background: var(--brand-soft);
  border-left: 3px solid var(--brand);
}

.session-body {
  flex: 1;
  min-width: 0;
  padding: 12px 8px 12px 14px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.session-item.active .session-body {
  padding-left: 11px;
}

.session-delete {
  width: 30px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
  opacity: 0;
  transition: opacity .15s, color .15s, background .15s;
}

.session-item:hover .session-delete,
.session-delete:focus-visible {
  opacity: 1;
}

.session-delete:hover {
  color: var(--danger);
  background: rgba(182, 74, 69, .08);
}

.session-title {
  font-size: 13px;
  font-weight: 800;
}

.session-meta {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.chat-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
}

.messages {
  padding: 16px;
  overflow-y: auto;
  min-height: 0;
}

.empty-state {
  min-height: 260px;
  display: grid;
  place-items: center;
  color: var(--muted);
  text-align: center;
}

.message {
  display: grid;
  gap: 8px;
  margin-bottom: 16px;
}

.message.user {
  justify-items: end;
}

.bubble {
  max-width: 88%;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
  line-height: 1.7;
  font-size: 14px;
  white-space: pre-wrap;
}

.message.user .bubble {
  color: #fff;
  border-color: var(--brand);
  background: var(--brand);
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 14px;
  border-top: 1px solid var(--line);
  background: #fbfcfc;
}

.composer textarea {
  resize: vertical;
  min-height: 54px;
  max-height: 140px;
  padding: 10px 12px;
  border: 1px solid #cfdcd7;
  border-radius: 8px;
}

.reference-card {
  padding: 12px 14px;
  border-top: 1px solid var(--line);
}

.reference-card strong {
  display: block;
  font-size: 13px;
}

.reference-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 14px;
  border-top: 1px solid var(--line);
}

.stat-strip div, .usage-board div {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfc;
}

.stat-strip strong, .usage-board strong {
  display: block;
  font-size: 22px;
}

.stat-strip span, .usage-board span {
  color: var(--muted);
  font-size: 12px;
}

.admin-view {
  align-content: start;
  padding: 0;
  overflow: auto;
}

.audit-grid {
  min-height: 0;
}

.inline-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.inline-form input, .inline-form select {
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(10, 24, 20, .46);
  backdrop-filter: blur(10px);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  width: min(620px, 100%);
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.52);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(8, 22, 18, .24);
}

.modal-head {
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.modal-head h2 {
  margin: 0;
  font-size: 16px;
}

.modal-head p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.modal-body {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.drop-zone {
  min-height: 190px;
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 22px;
  text-align: center;
  border: 1px dashed #97b5ab;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(18,104,84,.08), rgba(28,127,158,.08)),
    #fbfcfc;
}

.drop-zone.is-dragging,
.drop-zone.has-file {
  border-color: var(--brand);
  background: var(--brand-soft);
}

.drop-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--brand);
  border-radius: 8px;
  font-size: 22px;
  font-weight: 900;
}

.drop-zone strong {
  font-size: 15px;
}

.drop-zone small {
  color: var(--muted);
}

.modal-grid {
  display: grid;
  grid-template-columns: 1fr 160px;
  gap: 12px;
}

.modal-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
}

.modal-grid input,
.modal-grid select {
  height: 38px;
  padding: 0 10px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.table-wrap {
  margin: 16px;
  overflow: auto;
  box-shadow: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th, td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

th {
  color: var(--muted);
  background: #fbfcfc;
  font-weight: 800;
}

.tag {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  margin: 2px 4px 2px 0;
  padding: 0 8px;
  border-radius: 8px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  font-weight: 700;
}

.audit-grid {
  display: grid;
  gap: 16px;
}

.usage-board {
  margin: 16px 16px 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 14px;
  box-shadow: none;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(360px, calc(100vw - 36px));
  padding: 12px 14px;
  color: #fff;
  background: var(--brand-dark);
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: .2s ease;
}

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

@media (max-width: 1120px) {
  .chat-layout {
    grid-template-columns: 240px minmax(0, 1fr);
  }
}

@media (max-width: 760px) {
  html, body {
    overflow: auto;
  }

  .app-shell {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
  }

  .main, .view {
    overflow: visible;
  }

  .chat-layout, .usage-board {
    grid-template-columns: 1fr;
  }

  .topbar, .section-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .composer {
    grid-template-columns: 1fr;
  }
}