:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --panel-soft: #eef6f3;
  --ink: #172026;
  --muted: #667085;
  --line: #d9dee7;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --warm: #c2410c;
  --ok: #16803c;
  --bad: #b42318;
  --shadow: 0 18px 50px rgba(23, 32, 38, 0.09);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(15, 118, 110, 0.06), transparent 300px),
    var(--bg);
  color: var(--ink);
  font-family:
    "Microsoft JhengHei",
    "Noto Sans TC",
    system-ui,
    sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px clamp(18px, 4vw, 48px) 18px;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.65rem, 3vw, 2.45rem);
  line-height: 1.15;
}

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

.icon-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-size: 1.1rem;
  box-shadow: 0 8px 22px rgba(23, 32, 38, 0.06);
}

.icon-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.shell {
  display: grid;
  grid-template-columns: minmax(210px, 280px) minmax(0, 1fr);
  gap: 22px;
  padding: 0 clamp(18px, 4vw, 48px) 40px;
}

.sidebar {
  align-self: start;
  position: sticky;
  top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-weight: 800;
}

.paper-nav {
  display: grid;
  gap: 4px;
  padding: 8px;
}

.paper-button {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  width: 100%;
  padding: 12px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.paper-button:hover,
.paper-button.is-active {
  background: var(--panel-soft);
}

.paper-button.is-active {
  color: var(--accent-strong);
  font-weight: 800;
}

.paper-meta {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
}

.tag {
  align-self: start;
  border-radius: 999px;
  padding: 2px 8px;
  background: #e9edf5;
  color: #475467;
  font-size: 0.72rem;
  font-weight: 800;
}

.workspace {
  min-width: 0;
}

.summary-band {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.summary-band > div {
  min-width: 0;
  padding: 16px;
  background: var(--panel);
}

.summary-label {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.summary-band strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: 1.05rem;
}

.tabbar {
  display: inline-flex;
  gap: 4px;
  margin: 18px 0;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.tab {
  min-width: 92px;
  padding: 9px 14px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 800;
}

.tab.is-active {
  background: var(--accent);
  color: #fff;
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.section-block {
  margin-bottom: 22px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.section-head h2 {
  margin-bottom: 4px;
  font-size: 1.22rem;
}

.section-head p {
  margin-bottom: 0;
  color: var(--muted);
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}

.question-title {
  display: block;
  min-height: 44px;
  margin-bottom: 10px;
  line-height: 1.5;
}

input[type="text"] {
  width: 100%;
  min-height: 42px;
  border: 1px solid #c7cedb;
  border-radius: 7px;
  padding: 9px 11px;
  background: #fff;
  color: var(--ink);
}

input[type="text"]:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(15, 118, 110, 0.16);
}

.answer-feedback {
  min-height: 22px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.answer-feedback.ok {
  color: var(--ok);
}

.answer-feedback.bad {
  color: var(--bad);
}

.empty-state,
.tool-panel,
.pdf-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
  box-shadow: var(--shadow);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.tool-panel h3 {
  margin-bottom: 9px;
  font-size: 1rem;
}

.tool-panel p {
  color: var(--muted);
  line-height: 1.6;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.primary-button,
.secondary-button {
  min-height: 40px;
  border-radius: 7px;
  padding: 8px 13px;
  font-weight: 800;
  text-decoration: none;
}

.primary-button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
}

.secondary-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.pdf-frame {
  width: 100%;
  height: min(76vh, 780px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.phrase-list {
  display: grid;
  gap: 8px;
  max-height: 460px;
  overflow: auto;
  padding-right: 4px;
}

.phrase-item {
  display: grid;
  grid-template-columns: minmax(100px, 0.4fr) minmax(0, 1fr);
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding: 9px 0;
}

.phrase-item strong,
.phrase-item span {
  overflow-wrap: anywhere;
}

.phrase-item strong {
  color: var(--warm);
}

.check-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
}

.score-pill {
  border-radius: 999px;
  padding: 7px 11px;
  background: #e9edf5;
  color: #344054;
  font-weight: 800;
}

@media (max-width: 820px) {
  .topbar {
    align-items: flex-start;
  }

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

  .sidebar {
    position: static;
  }

  .summary-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .topbar {
    padding-top: 20px;
  }

  .summary-band {
    grid-template-columns: 1fr;
  }

  .tabbar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 100%;
  }

  .tab {
    min-width: 0;
    padding-inline: 8px;
  }

  .question-grid,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .phrase-item {
    grid-template-columns: 1fr;
  }
}

@media print {
  .topbar,
  .sidebar,
  .tabbar,
  .top-actions,
  .action-row {
    display: none;
  }

  .shell {
    display: block;
    padding: 0;
  }

  .summary-band,
  .question-card {
    box-shadow: none;
  }
}