:root {
  --bg: #eef5ff;
  --bg-2: #dbeafe;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: #ffffff;
  --line: #c7dcf8;
  --line-strong: #9cc3f5;
  --text: #16324f;
  --muted: #5f7f9f;
  --accent: #2f80ed;
  --accent-strong: #1c63c7;
  --accent-soft: #e8f2ff;
  --ok-bg: #e9f7f1;
  --ok-text: #19744e;
  --danger-bg: #fdecec;
  --danger-text: #b53f4e;
  --shadow: 0 18px 48px rgba(47, 128, 237, 0.12);
  --radius: 18px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --app-h: 100vh;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(47, 128, 237, 0.18), transparent 30%),
    linear-gradient(180deg, #f6fbff 0%, var(--bg) 54%, var(--bg-2) 100%);
}

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

.app-shell {
  height: var(--app-h);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow: hidden;
}

.topbar,
.panel,
.modal-box,
.toast {
  backdrop-filter: blur(16px);
}

.topbar,
.panel {
  background: var(--panel);
  border: 1px solid rgba(156, 195, 245, 0.75);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  flex: 0 0 auto;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent-strong);
}

.topbar h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.topbar-actions,
.toolbar,
.modal-actions,
.header-badges {
  display: flex;
  align-items: center;
  gap: 10px;
}

.workspace {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  gap: 0;
  overflow: hidden;
}

.panel {
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#sidebar {
  flex: 0 0 330px;
  min-width: 260px;
}

#result-panel {
  flex: 1 1 auto;
  min-width: 360px;
}

#template-panel {
  flex: 0 0 42%;
  min-width: 360px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.92));
  flex: 0 0 auto;
}

.sidebar-header {
  flex-direction: column;
}

.panel-heading span {
  display: block;
  font-size: 15px;
  font-weight: 700;
}

.panel-heading small {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  line-height: 1.45;
}

.header-badges {
  flex-wrap: wrap;
}

.panel-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

.panel-scroll,
.tree,
#template-tab,
#original-tab {
  height: 100%;
  min-height: 0;
}

.tree,
#result-body,
#template-body,
#template-editor,
#template-preview,
#original-content,
#result-md {
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: #8bb8f1 rgba(232, 242, 255, 0.7);
}

.tree::-webkit-scrollbar,
#result-body::-webkit-scrollbar,
#template-body::-webkit-scrollbar,
#template-editor::-webkit-scrollbar,
#template-preview::-webkit-scrollbar,
#original-content::-webkit-scrollbar,
#result-md::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.tree::-webkit-scrollbar-track,
#result-body::-webkit-scrollbar-track,
#template-body::-webkit-scrollbar-track,
#template-editor::-webkit-scrollbar-track,
#template-preview::-webkit-scrollbar-track,
#original-content::-webkit-scrollbar-track,
#result-md::-webkit-scrollbar-track {
  background: rgba(232, 242, 255, 0.8);
  border-radius: 999px;
}

.tree::-webkit-scrollbar-thumb,
#result-body::-webkit-scrollbar-thumb,
#template-body::-webkit-scrollbar-thumb,
#template-editor::-webkit-scrollbar-thumb,
#template-preview::-webkit-scrollbar-thumb,
#original-content::-webkit-scrollbar-thumb,
#result-md::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, #8bb8f1, #4f93eb);
  border-radius: 999px;
  border: 2px solid rgba(232, 242, 255, 0.8);
}

.gutter {
  width: 10px;
  position: relative;
  flex: 0 0 auto;
}

.gutter::before {
  content: "";
  position: absolute;
  inset: 18px 3px;
  border-radius: 999px;
  background: rgba(47, 128, 237, 0.18);
  transition: background 0.15s ease;
}

.gutter:hover::before,
.gutter.dragging::before {
  background: rgba(47, 128, 237, 0.44);
}

.btn {
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-strong);
  color: var(--text);
  padding: 0 14px;
  cursor: pointer;
  transition: 0.15s ease;
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.btn.primary {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
}

.btn.primary:hover {
  filter: brightness(1.03);
}

.btn.sm {
  height: 34px;
  padding: 0 12px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

select.btn {
  min-width: 132px;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid transparent;
}

.badge {
  background: var(--ok-bg);
  color: var(--ok-text);
  border-color: rgba(25, 116, 78, 0.12);
}

.badge.muted {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-color: rgba(47, 128, 237, 0.18);
}

.tree {
  padding: 12px;
}

.tree-node + .tree-node {
  margin-top: 2px;
}

.tree-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 6px 10px;
  border-radius: 12px;
  cursor: pointer;
}

.tree-row:hover {
  background: rgba(47, 128, 237, 0.08);
}

.tree-row.selected {
  background: linear-gradient(135deg, rgba(47, 128, 237, 0.16), rgba(47, 128, 237, 0.06));
}

.tree-row.active-meeting {
  outline: 1px solid rgba(47, 128, 237, 0.28);
}

.tree-row .arrow,
.tree-row .icon,
.tree-row .del-btn,
.meeting-pin {
  flex: 0 0 auto;
}

.tree-row .arrow {
  width: 14px;
  text-align: center;
  color: var(--muted);
  transition: transform 0.1s ease;
}

.tree-row .arrow.expanded {
  transform: rotate(90deg);
}

.tree-row .arrow.none {
  visibility: hidden;
}

.tree-row .label {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-row .del-btn,
.meeting-pin {
  color: var(--muted);
  font-size: 12px;
}

.tree-row .del-btn {
  display: none;
}

.tree-row:hover .del-btn {
  display: inline;
}

.tree-children {
  display: none;
}

.tree-children.open {
  display: block;
}

.empty-state,
.processing {
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--muted);
  padding: 32px;
  text-align: center;
}

.empty-icon {
  width: 72px;
  height: 72px;
  border-radius: 24px;
  display: grid;
  place-items: center;
  margin: 0 auto 14px;
  color: var(--accent-strong);
  background: linear-gradient(135deg, rgba(47, 128, 237, 0.16), rgba(47, 128, 237, 0.05));
  font-size: 26px;
  font-weight: 700;
}

.spinner {
  width: 38px;
  height: 38px;
  border: 3px solid rgba(47, 128, 237, 0.16);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.stream-box {
  position: relative;
  width: min(620px, calc(100% - 40px));
  background: rgba(248, 252, 255, 0.98);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  text-align: left;
  box-shadow: 0 14px 36px rgba(47, 128, 237, 0.1);
}

.stream-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: -35%;
  width: 35%;
  height: 3px;
  background: linear-gradient(90deg, rgba(47, 128, 237, 0), rgba(47, 128, 237, 0.95), rgba(47, 128, 237, 0));
  animation: marquee-glow 1.8s linear infinite;
}

.stream-title {
  position: relative;
  padding: 12px 16px 10px;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
  color: var(--accent-strong);
  background: linear-gradient(180deg, rgba(232, 242, 255, 0.92), rgba(248, 252, 255, 0.98));
  overflow: hidden;
}

.stream-title::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -100%;
  width: 100%;
  background: linear-gradient(
    90deg,
    rgba(47, 128, 237, 0) 0%,
    rgba(125, 182, 255, 0.12) 16%,
    rgba(125, 182, 255, 0.28) 38%,
    rgba(125, 182, 255, 0.36) 50%,
    rgba(125, 182, 255, 0.28) 62%,
    rgba(125, 182, 255, 0.12) 84%,
    rgba(47, 128, 237, 0) 100%
  );
  transform: none;
  animation: title-marquee 2.2s linear infinite;
  pointer-events: none;
}

.stream-content,
#original-content,
#template-editor {
  font-family: var(--mono);
}

.stream-content {
  margin: 0;
  padding: 14px 16px 16px;
  white-space: pre-wrap;
  min-height: 116px;
  max-height: 220px;
  overflow: auto;
  color: #557cad;
  line-height: 1.45;
  background: rgba(251, 253, 255, 0.96);
}

@keyframes marquee-glow {
  from {
    left: -35%;
  }
  to {
    left: 100%;
  }
}

@keyframes title-marquee {
  0% {
    left: -100%;
  }
  62% {
    left: 100%;
  }
  100% {
    left: 100%;
  }
}

#result-md,
#template-preview,
#original-markdown,
#original-content {
  padding: 18px 20px;
}

#result-md,
#template-preview,
#original-markdown {
  display: none;
}

#template-editor {
  width: 100%;
  height: 100%;
  border: 0;
  padding: 18px 20px;
  background: transparent;
  resize: none;
  outline: none;
  font-size: 13px;
  line-height: 1.7;
  display: none;
}

#original-content {
  margin: 0;
  white-space: pre-wrap;
  line-height: 1.7;
}

.panel-tabs {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(232, 242, 255, 0.55);
}

.tab {
  min-height: 34px;
  padding: 0 14px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.tab.active {
  background: rgba(47, 128, 237, 0.15);
  color: var(--accent-strong);
}

.md-content {
  line-height: 1.8;
  color: var(--text);
}

.md-content h1,
.md-content h2,
.md-content h3 {
  line-height: 1.35;
}

.md-content code {
  background: rgba(47, 128, 237, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
}

.md-content pre {
  padding: 14px;
  overflow: auto;
  border-radius: 14px;
  background: #12325e;
  color: #eef6ff;
}

.md-content blockquote {
  margin: 0;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.modal-mask {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  background: rgba(17, 47, 84, 0.28);
  padding: 20px;
}

.modal-mask.show {
  display: grid;
}

.modal-box {
  width: min(480px, 100%);
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(156, 195, 245, 0.8);
  border-radius: 22px;
  padding: 22px;
  box-shadow: var(--shadow);
}

.modal-box h3 {
  margin-top: 0;
}

.form-field {
  display: block;
  margin-bottom: 14px;
}

.form-field span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.form-field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f9fcff;
}

.toast {
  position: fixed;
  top: 22px;
  right: 22px;
  max-width: 360px;
  padding: 12px 16px;
  border-radius: 14px;
  color: #fff;
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
  transition: 0.18s ease;
  background: rgba(28, 99, 199, 0.96);
}

.toast.err {
  background: rgba(181, 63, 78, 0.95);
}

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

@media (max-width: 1100px) {
  html,
  body {
    overflow: auto;
  }

  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .workspace {
    flex-direction: column;
    overflow: visible;
  }

  #sidebar,
  #result-panel,
  #template-panel {
    flex-basis: auto;
    min-width: 0;
  }

  .gutter {
    display: none;
  }

  .panel {
    min-height: 360px;
  }

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