:root {
  --bg: #f2efe8;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --ink: #1f2430;
  --muted: #5c6575;
  --line: rgba(31, 36, 48, 0.12);
  --accent: #0f766e;
  --accent-strong: #115e59;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --shadow: 0 24px 60px rgba(54, 43, 23, 0.12);
  --warning: #b54708;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.13), transparent 28%),
    radial-gradient(circle at top right, rgba(193, 118, 75, 0.14), transparent 24%),
    linear-gradient(180deg, #f5f3ee 0%, #ece6dd 100%);
  min-height: 100vh;
}

.shell {
  width: min(960px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 48px 0 64px;
}

.shell.narrow {
  width: min(720px, calc(100vw - 32px));
}

.hero {
  padding: 12px 4px 24px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

h1,
h2 {
  margin: 0;
  line-height: 1.12;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
}

.lede {
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
}

.lede.compact {
  max-width: 560px;
}

.card {
  backdrop-filter: blur(14px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  border-radius: 28px;
  padding: 28px;
  margin-top: 18px;
}

.centered {
  text-align: center;
}

.hidden {
  display: none;
}

.plain-list {
  margin: 18px 0 20px;
  padding-left: 20px;
  color: var(--muted);
  line-height: 1.8;
}

.form-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 18px 0;
}

.field {
  display: grid;
  gap: 8px;
  margin: 16px 0;
}

.field span {
  font-weight: 600;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  font: inherit;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(15, 118, 110, 0.18);
  border-color: rgba(15, 118, 110, 0.35);
}

.consent {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin: 12px 0 22px;
  color: var(--muted);
}

.consent input {
  width: 18px;
  height: 18px;
  margin-top: 2px;
}

button {
  font: inherit;
  border: none;
  border-radius: 999px;
  padding: 14px 22px;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

button:hover {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.primary-button {
  background: linear-gradient(135deg, var(--accent) 0%, #1b8f84 100%);
  color: white;
  box-shadow: 0 12px 28px rgba(15, 118, 110, 0.22);
}

.secondary-button {
  background: #1f2430;
  color: white;
}

.progress-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.pill {
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 700;
}

.progress-bar {
  margin-top: 18px;
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(31, 36, 48, 0.08);
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #d97706 0%, #0f766e 100%);
  transition: width 180ms ease;
}

.audio-panel,
.answer-panel,
.summary-box {
  margin-top: 24px;
  padding: 22px;
  border-radius: 22px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

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

.confidence-button {
  min-width: 54px;
  background: rgba(31, 36, 48, 0.07);
  color: var(--ink);
  font-weight: 700;
}

.confidence-button.is-active {
  background: #1f2430;
  color: white;
}

.muted {
  min-height: 22px;
  color: var(--muted);
  line-height: 1.6;
}

.muted.is-error {
  color: var(--warning);
}

@media (max-width: 640px) {
  .shell {
    padding-top: 28px;
  }

  .card {
    padding: 22px 18px;
    border-radius: 22px;
  }

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

  .confidence-button {
    flex: 1 1 calc(20% - 8px);
  }
}