:root {
  --ink: #232235;
  --muted: #716f80;
  --line: #dcd9ec;
  --paper: #fff;
  --lavender: #7671c8;
  --lavender-dark: #514ca7;
  --lavender-soft: #e8e5fa;
  --danger: #9f3d4d;
  --success-soft: #eef8f2;
}

* { box-sizing: border-box; }

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 2%, rgba(118, 113, 200, 0.16), transparent 32rem),
    linear-gradient(#f9f8fc 0%, #f2f0f8 100%);
  margin: 0;
  min-height: 100vh;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

button, select, textarea { font: inherit; }
button, select { min-height: 44px; }

.site-shell {
  width: min(1100px, 100% - 32px);
  margin: 0 auto;
  padding: 42px 0 32px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 26px;
}

.eyebrow {
  color: var(--lavender-dark);
  letter-spacing: .12em;
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
}

h1 {
  letter-spacing: -.04em;
  margin: 0;
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1.08;
}

.subtitle { color: var(--muted); margin: 12px 0 0; font-size: 16px; }

.status-pill {
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--lavender-dark);
  white-space: nowrap;
  border-radius: 999px;
  padding: 9px 14px;
  font-size: 13px;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

label { color: var(--muted); display: grid; gap: 7px; font-size: 13px; }

select, textarea {
  border: 1px solid var(--line);
  background: var(--paper);
  width: 100%;
  color: var(--ink);
  border-radius: 12px;
  outline: none;
}

select { padding: 0 12px; }
textarea { resize: vertical; min-height: 160px; padding: 15px 16px; line-height: 1.8; }
select:focus, textarea:focus { border-color: var(--lavender); box-shadow: 0 0 0 3px rgba(118, 113, 200, .15); }

.practice-card, .answer-panel, .result-panel {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .93);
  border-radius: 22px;
  box-shadow: 0 18px 50px rgba(54, 49, 100, .08);
}

.practice-card { min-height: 330px; padding: clamp(22px, 4vw, 36px); }

.section-heading {
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 18px;
}

.section-heading span { color: var(--lavender-dark); font-size: 18px; font-weight: 700; }
.section-heading small { color: var(--muted); text-align: right; }
.learning-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 28px; padding-top: 22px; }
.learning-grid article { min-width: 0; }
h2 { margin: 0 0 10px; font-size: 16px; }
p { line-height: 1.8; }
ul { margin: 0; padding-left: 20px; }
li { margin: 7px 0; line-height: 1.65; }
.script-reference { border-left: 4px solid var(--lavender); background: var(--lavender-soft); border-radius: 12px; padding: 18px 20px; }
.script-reference p { margin: 0; }
.task-content, .customer-question, .danger-box { padding-top: 24px; }
.task-content h2:not(:first-child) { margin-top: 22px; }
.customer-question b, .danger-box b { color: var(--lavender-dark); }
.customer-question p, .danger-box p { margin: 10px 0 0; font-size: 20px; line-height: 1.65; }
.danger-box p { color: var(--danger); }
details { margin-top: 24px; }
summary { cursor: pointer; color: var(--lavender-dark); font-weight: 700; }
.table-wrap { margin-top: 14px; overflow-x: auto; }
table { border-collapse: collapse; width: 100%; min-width: 720px; }
th, td { border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; padding: 13px 12px; line-height: 1.6; }
th { color: var(--muted); font-size: 13px; }
td:first-child { width: 34%; color: var(--danger); }

.answer-panel { display: grid; gap: 12px; margin-top: 16px; padding: 22px; }
.action-row { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
button { cursor: pointer; border: 0; border-radius: 10px; padding: 0 18px; transition: transform .15s, opacity .15s; }
button:hover:not(:disabled) { transform: translateY(-1px); }
button:disabled { cursor: not-allowed; opacity: .45; }
.primary { background: var(--lavender-dark); color: #fff; }
.secondary { background: var(--lavender-soft); color: var(--lavender-dark); }
.ghost { color: var(--muted); border: 1px solid var(--line); background: transparent; }

.result-panel { background: var(--success-soft); grid-template-columns: 140px 1fr; gap: 22px 28px; margin-top: 16px; padding: 24px; }
.score { border-right: 1px solid var(--line); align-content: center; justify-items: center; display: grid; }
.score span, .score small { color: var(--muted); font-size: 12px; }
.score strong { color: var(--lavender-dark); font-size: 54px; line-height: 1; }
.reference-result { border-top: 1px solid var(--line); grid-column: 1 / -1; padding-top: 18px; }
.reference-result p { margin: 0; }
footer { color: var(--muted); text-align: center; margin-top: 24px; font-size: 12px; line-height: 1.8; }
[hidden] { display: none !important; }

@media (max-width: 760px) {
  .site-shell { width: min(100% - 20px, 1100px); padding-top: 24px; }
  .topbar { display: grid; }
  .status-pill { justify-self: start; }
  .control-grid { grid-template-columns: 1fr 1fr; }
  .learning-grid { grid-template-columns: 1fr; }
  .section-heading { display: grid; }
  .section-heading small { text-align: left; }
  .result-panel { grid-template-columns: 1fr; }
  .score { border-right: 0; border-bottom: 1px solid var(--line); padding-bottom: 18px; }
}

@media (max-width: 480px) {
  .control-grid { grid-template-columns: 1fr; }
  .practice-card, .answer-panel, .result-panel { border-radius: 16px; }
  .action-row { display: grid; grid-template-columns: 1fr 1fr; }
  button { width: 100%; }
}