:root {
  --research-ink: #10233d;
  --research-muted: #61708a;
  --research-line: #dce6f3;
  --research-blue: #1769e0;
  --research-soft: #edf5ff;
  --research-risk: #fff4df;
}

.douyin-research-app {
  min-height: 100vh;
  margin: 0;
  color: var(--research-ink);
  background:
    radial-gradient(circle at 88% 0%, rgba(66, 159, 255, 0.15), transparent 30rem),
    #f6f9fd;
}

.research-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0 80px;
}

.research-masthead,
.session-card,
.research-card,
.task-card,
.result-card {
  border: 1px solid var(--research-line);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 20px 60px rgba(37, 72, 118, 0.08);
}

.research-masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 32px;
  border-radius: 28px;
}

.research-masthead h1,
.session-card h2,
.research-card h2,
.task-card h2,
.result-card h2 {
  margin: 6px 0 8px;
  color: var(--research-ink);
}

.research-masthead h1 {
  font-size: clamp(32px, 5vw, 54px);
  letter-spacing: -0.05em;
}

.research-masthead p,
.session-card p,
.research-card p,
.task-card p,
.result-card p {
  margin: 0;
  color: var(--research-muted);
  line-height: 1.7;
}

.research-kicker,
.section-label {
  color: var(--research-blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.session-card,
.task-card,
.result-card {
  margin-top: 22px;
  padding: 26px;
  border-radius: 24px;
}

.session-card {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto;
  gap: 18px 28px;
  align-items: center;
}

.session-state,
.session-actions,
.task-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.session-actions,
.privacy-note {
  grid-column: 1 / -1;
}

.state-badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 13px;
  border-radius: 999px;
  color: #53647c;
  background: #edf1f6;
  font-size: 13px;
  font-weight: 700;
}

.state-badge.is-ready {
  color: #08785e;
  background: #e2f8f0;
}

.state-badge.is-active {
  color: #175dc7;
  background: #e7f1ff;
}

.state-badge.is-risk {
  color: #9b5a00;
  background: #fff0cf;
}

.primary-action,
.secondary-action,
.ghost-action {
  min-height: 44px;
  padding: 0 18px;
  border-radius: 13px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

.primary-action {
  color: #fff;
  background: linear-gradient(135deg, #1269e8, #318cfa);
  box-shadow: 0 10px 25px rgba(23, 105, 224, 0.2);
}

.secondary-action {
  color: var(--research-blue);
  border-color: #bcd4f5;
  background: var(--research-soft);
}

.ghost-action {
  color: #59687c;
  border-color: var(--research-line);
  background: #fff;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 22px;
}

.research-card {
  padding: 28px;
  border-radius: 24px;
}

.research-card form {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.research-card label {
  display: grid;
  gap: 8px;
  color: #33445c;
  font-size: 14px;
  font-weight: 750;
}

.research-card input,
.research-card textarea {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #cfdceb;
  border-radius: 13px;
  padding: 13px 14px;
  color: var(--research-ink);
  background: #fbfdff;
  font: inherit;
  resize: vertical;
  outline: none;
}

.research-card input:focus,
.research-card textarea:focus {
  border-color: #61a2f3;
  box-shadow: 0 0 0 4px rgba(49, 140, 250, 0.12);
}

.task-heading,
.result-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.task-actions {
  margin-top: 20px;
}

.risk-panel {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid #f1cf87;
  border-radius: 16px;
  background: var(--research-risk);
}

.risk-panel p {
  color: #7a5515;
}

.risk-panel ul {
  margin: 10px 0 0;
  padding-left: 20px;
  color: #7a5515;
}

.result-table-wrap {
  overflow-x: auto;
  margin-top: 22px;
}

.result-card table {
  width: 100%;
  border-collapse: collapse;
  min-width: 900px;
}

.result-card th,
.result-card td {
  padding: 13px 12px;
  border-bottom: 1px solid #e6edf6;
  text-align: left;
  vertical-align: top;
  font-size: 13px;
}

.result-card th {
  color: #697991;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.result-card td:nth-child(2) {
  min-width: 280px;
  white-space: pre-wrap;
}

.result-card a {
  color: var(--research-blue);
  font-weight: 700;
}

.research-toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  max-width: min(420px, calc(100% - 48px));
  padding: 14px 18px;
  border-radius: 14px;
  color: #fff;
  background: #10233d;
  box-shadow: 0 18px 50px rgba(16, 35, 61, 0.25);
}

@media (max-width: 760px) {
  .research-shell {
    width: min(100% - 24px, 1180px);
    padding-top: 12px;
  }

  .research-masthead,
  .task-heading,
  .result-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .session-card,
  .research-grid {
    grid-template-columns: 1fr;
  }

  .session-state {
    justify-content: flex-start;
  }
}