:root {
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-strong: #eef7f4;
  --ink: #16211f;
  --muted: #63716f;
  --line: #dfe7e4;
  --teal: #0f766e;
  --teal-dark: #0b5f59;
  --coral: #e85536;
  --amber: #d99221;
  --blue: #2563eb;
  --green: #1f8a4c;
  --shadow: 0 18px 44px rgba(16, 36, 33, 0.08);
  color-scheme: light;
  font-family: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
}

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

button {
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 72px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 8px;
  background: var(--teal);
  color: #fff;
  font-weight: 800;
  letter-spacing: 0;
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
}

.top-actions,
.panel-heading,
.section-heading,
.form-row,
.metric-line,
.wallet-card,
.primary-action,
.ghost-button,
.nav-button {
  display: flex;
  align-items: center;
}

.top-actions {
  gap: 10px;
}

.wallet-card {
  gap: 8px;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  white-space: nowrap;
}

.icon-button,
.primary-action,
.ghost-button {
  min-height: 42px;
  border-radius: 8px;
  border: 1px solid transparent;
}

.icon-button {
  display: grid;
  width: 42px;
  place-items: center;
  background: var(--ink);
  color: #fff;
}

.workspace {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
}

.nav-list,
.stack-form,
.mission-list,
.compact-list,
.question-list,
.answer-list,
.level-list {
  display: grid;
  gap: 10px;
}

.nav-list {
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.nav-button {
  gap: 10px;
  width: 100%;
  min-height: 46px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  text-align: left;
}

.nav-button.active,
.nav-button:hover {
  background: var(--surface-strong);
  color: var(--teal-dark);
}

.learning-photo {
  margin: 18px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.learning-photo img {
  aspect-ratio: 4 / 3;
  width: 100%;
  object-fit: cover;
}

.learning-photo figcaption {
  display: grid;
  gap: 4px;
  padding: 14px;
}

.learning-photo span,
.eyebrow,
.tag,
.balance-box span,
.mission-card small,
.stat-card span,
.question-meta,
.answer-meta,
.note-meta {
  color: var(--muted);
  font-size: 0.86rem;
}

.learning-photo strong {
  font-size: 1.2rem;
}

.main-panel {
  min-width: 0;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.section-heading {
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.section-heading h1 {
  margin: 4px 0 0;
  max-width: 780px;
  font-size: 2rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  font-weight: 700;
  text-transform: uppercase;
}

.primary-action,
.ghost-button {
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  font-weight: 700;
  white-space: nowrap;
}

.primary-action {
  background: var(--teal);
  color: #fff;
}

.primary-action:hover {
  background: var(--teal-dark);
}

.ghost-button {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.stats-grid,
.market-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat-card,
.panel,
.note-card,
.market-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 18px;
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.7rem;
}

.stat-card:nth-child(2) {
  border-top: 4px solid var(--coral);
}

.stat-card:nth-child(3) {
  border-top: 4px solid var(--amber);
}

.stat-card:nth-child(4) {
  border-top: 4px solid var(--blue);
}

.dashboard-grid,
.notes-layout,
.trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 18px;
}

.panel,
.note-card,
.market-card {
  padding: 18px;
}

.panel-heading {
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.panel-heading h2 {
  margin: 0;
  font-size: 1.1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 8px;
  background: #edf2f7;
  font-weight: 700;
}

.mission-card,
.compact-item,
.question-card,
.answer-card,
.level-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
}

.mission-card {
  display: grid;
  gap: 6px;
  padding: 14px;
}

.mission-card strong {
  display: block;
}

.compact-item {
  display: grid;
  gap: 6px;
  padding: 12px;
}

.compact-item strong {
  line-height: 1.35;
}

.control,
input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

input,
select {
  min-height: 42px;
  padding: 0 12px;
}

textarea {
  resize: vertical;
  min-height: 120px;
  padding: 12px;
  line-height: 1.6;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 700;
}

label span {
  font-size: 0.9rem;
}

.form-row {
  gap: 10px;
}

.form-row label {
  flex: 1;
  min-width: 0;
}

.qa-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) minmax(320px, 1fr);
  grid-template-areas:
    "form list"
    "answer answer";
  gap: 18px;
}

.qa-layout > .panel:first-child {
  grid-area: form;
}

.question-panel {
  grid-area: list;
}

.answer-panel {
  grid-area: answer;
}

.question-card {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 14px;
  text-align: left;
}

.question-card.active {
  border-color: var(--teal);
  background: var(--surface-strong);
}

.question-card h3,
.answer-card h3,
.note-card h3,
.market-card h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.4;
}

.question-meta,
.answer-meta,
.note-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.selected-question {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  padding: 16px;
  border-radius: 8px;
  background: var(--surface-strong);
}

.selected-question p,
.answer-card p,
.note-card p,
.market-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.answer-card {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.answer-card.accepted {
  border-color: rgba(31, 138, 76, 0.45);
  background: #effaf3;
}

.score-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 8px;
  background: #fff;
  color: var(--teal-dark);
  font-weight: 800;
}

.notes-layout {
  grid-template-columns: 360px minmax(0, 1fr);
}

.notes-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.note-card {
  display: grid;
  gap: 10px;
}

.market-card {
  display: grid;
  gap: 12px;
  min-height: 220px;
}

.market-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 8px;
  background: var(--surface-strong);
  color: var(--teal-dark);
}

.market-card strong {
  font-size: 1.5rem;
}

.balance-box {
  display: grid;
  gap: 4px;
  min-width: 150px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.trust-grid {
  grid-template-columns: 0.8fr 1fr 1fr;
}

.reputation-meter {
  overflow: hidden;
  height: 14px;
  border-radius: 8px;
  background: #edf2f7;
}

.reputation-meter div {
  width: 0;
  height: 100%;
  border-radius: 8px;
  background: var(--green);
  transition: width 220ms ease;
}

.metric-line {
  gap: 4px;
  margin: 16px 0 0;
}

.metric-line strong {
  font-size: 2.2rem;
}

.level-item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 10px;
  padding: 12px;
}

.level-item strong {
  display: block;
}

.level-item.active {
  border-color: var(--teal);
  background: var(--surface-strong);
}

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 50;
  max-width: min(420px, calc(100vw - 40px));
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

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

.empty-state {
  padding: 18px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
}

@media (max-width: 1120px) {
  .workspace,
  .dashboard-grid,
  .notes-layout,
  .trust-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .nav-list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .nav-button {
    justify-content: center;
  }

  .learning-photo {
    display: none;
  }

  .stats-grid,
  .market-grid,
  .notes-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px;
  }

  .top-actions,
  .wallet-card {
    width: 100%;
  }

  .wallet-card {
    flex: 1;
  }

  .workspace {
    padding: 14px;
  }

  .section-heading,
  .form-row {
    align-items: stretch;
    flex-direction: column;
  }

  .section-heading h1 {
    font-size: 1.55rem;
  }

  .nav-list,
  .stats-grid,
  .market-grid,
  .notes-list,
  .qa-layout {
    grid-template-columns: 1fr;
  }

  .qa-layout {
    grid-template-areas:
      "form"
      "list"
      "answer";
  }

  .nav-button {
    justify-content: flex-start;
  }
}