:root {
  color-scheme: light;
  --bg: #f5f8ff;
  --panel: #ffffff;
  --text: #172033;
  --muted: #657188;
  --line: #dbe5f4;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --soft: #eaf2ff;
  --danger: #dc2626;
  --ok: #166534;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 68px;
  padding: 0 7vw;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
}

.brand {
  font-weight: 800;
}

nav {
  display: flex;
  gap: 16px;
  color: var(--muted);
  font-size: 14px;
}

nav a:hover {
  color: var(--accent);
}

.layout {
  width: min(1100px, calc(100% - 44px));
  margin: 0 auto;
  padding: 56px 0 84px;
}

.intro {
  max-width: 760px;
  margin-bottom: 26px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 12px;
  font-size: clamp(36px, 7vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: 22px;
}

.intro p:not(.eyebrow) {
  color: var(--muted);
  font-size: 18px;
}

.panel {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 22px 60px rgba(37, 99, 235, 0.08);
}

.admin-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

form {
  display: grid;
  gap: 18px;
}

label,
.field {
  display: grid;
  gap: 8px;
  margin: 0;
  border: 0;
  padding: 0;
  color: var(--text);
  font-weight: 700;
}

legend {
  padding: 0;
  font-weight: 800;
}

.required {
  color: var(--danger);
}

input[type="text"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  font: inherit;
  padding: 11px 12px;
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: rgba(37, 99, 235, 0.7);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.option-list {
  display: grid;
  gap: 10px;
}

.option,
.switch-row {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 600;
}

.option input,
.switch-row input {
  width: 17px;
  height: 17px;
  accent-color: var(--accent);
}

button,
.primary {
  min-height: 42px;
  border: 0;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 800;
  padding: 0 17px;
  cursor: pointer;
}

button:hover,
.primary:hover {
  background: var(--accent-dark);
}

button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.result {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 7px;
  font-weight: 700;
}

.result.ok {
  border: 1px solid rgba(22, 101, 52, 0.2);
  background: #ecfdf3;
  color: var(--ok);
}

.result.error {
  border: 1px solid rgba(220, 38, 38, 0.22);
  background: #fff1f2;
  color: var(--danger);
}

.empty {
  margin: 0;
  color: var(--muted);
}

.section-title,
.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.share-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}

.share-row input {
  color: var(--muted);
  background: #f8fbff;
}

.section-title button,
.question-head button,
.share-row button {
  min-height: 36px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--accent-dark);
}

.question-editor {
  display: grid;
  gap: 14px;
}

.question-card {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdff;
}

.options-row {
  display: grid;
}

.submissions-panel {
  overflow: hidden;
}

.submissions {
  display: grid;
  gap: 10px;
}

.submission {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fbfdff;
}

.submission summary {
  cursor: pointer;
  padding: 12px 14px;
  font-weight: 800;
}

.submission dl {
  display: grid;
  grid-template-columns: minmax(100px, 0.25fr) minmax(0, 1fr);
  gap: 8px 14px;
  margin: 0;
  padding: 0 14px 14px;
}

.submission dt {
  color: var(--muted);
}

.submission dd {
  margin: 0;
  word-break: break-word;
}

@media (max-width: 720px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 22px;
  }

  .layout {
    width: calc(100% - 28px);
    padding-top: 40px;
  }

  .panel {
    padding: 18px;
  }

  .share-row {
    grid-template-columns: 1fr;
  }

  .submission dl {
    grid-template-columns: 1fr;
  }
}