:root {
  --bg: #eef4fb;
  --card: #ffffff;
  --text: #1f2d3d;
  --muted: #62758b;
  --primary: #1273de;
  --primary-soft: #e6f0fd;
  --danger: #d93025;
  --ok: #138a36;
  --border: #d8e3f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #dcecff 0%, var(--bg) 100%);
  color: var(--text);
}

.app {
  max-width: 680px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 16px 14px 24px;
}

.topbar {
  margin-bottom: 12px;
}

.topbar-brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  object-fit: cover;
  border: 1px solid var(--border);
  background: #fff;
}

.topbar h1 {
  margin: 0;
  font-size: 24px;
}

.topbar p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.brand-extra {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.brand-tag {
  display: inline-block;
  font-size: 12px;
  color: #1b4c81;
  background: #eaf3ff;
  border: 1px solid #cfe1f7;
  border-radius: 999px;
  padding: 4px 10px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 6px 16px rgba(18, 115, 222, 0.08);
}

.hidden {
  display: none;
}

.row {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
}

label {
  color: var(--muted);
  font-size: 13px;
}

select,
input[type="file"],
input[type="text"],
input[type="date"],
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

.btn {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 12px;
  background: #fff;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}

.btn.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint {
  margin: 10px 2px 0;
  font-size: 12px;
  color: var(--muted);
}

.license-box {
  border: 1px dashed #b8cff1;
  border-radius: 12px;
  padding: 12px;
  margin-bottom: 12px;
  background: #f8fbff;
}

.license-box h2 {
  margin: 0;
  font-size: 18px;
}

.license-actions {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 96px;
  gap: 8px;
}

.license-ok {
  color: var(--ok);
}

.license-bad {
  color: var(--danger);
}

.status {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}

.progress {
  margin-top: 8px;
  height: 8px;
  background: #ebf1f8;
  border-radius: 999px;
  overflow: hidden;
}

#progressBar {
  width: 0;
  height: 100%;
  background: var(--primary);
}

.question-card {
  margin-top: 12px;
}

.question-card h2 {
  margin: 0 0 6px;
  font-size: 18px;
}

.question-card p {
  margin: 0 0 12px;
  line-height: 1.55;
}

#options {
  display: grid;
  gap: 8px;
}

.option {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
  text-align: left;
  cursor: pointer;
}

.option.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.option.correct {
  border-color: var(--ok);
  background: #eaf8ef;
}

.option.wrong {
  border-color: var(--danger);
  background: #ffefef;
}

.result {
  margin-top: 12px;
  border-radius: 10px;
  padding: 10px;
  line-height: 1.5;
  font-size: 14px;
}

.result.ok {
  background: #eaf8ef;
  border: 1px solid #bee8cc;
}

.result.bad {
  background: #ffefef;
  border: 1px solid #f4c4c4;
}

.actions {
  margin-top: 10px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.actions + .actions {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 420px) {
  .app {
    padding: 12px 10px 18px;
  }

  .row {
    grid-template-columns: 64px 1fr;
    gap: 8px;
  }

  .license-actions {
    grid-template-columns: 1fr;
  }
}