/* ==========================================================
   AI 智能问卷平台 · 主题样式
   设计语言: 暖米白底 + 橙红主色 + 衬线标题, 参考 Claude 官网
   ========================================================== */

:root {
  /* 调色板 */
  --color-bg: #FAF9F5;
  --color-bg-cream: #F5F0E8;
  --color-card: #FFFFFF;
  --color-card-hover: #FBFAF6;
  --color-card-soft: #F0EBE0;

  --color-text: #3D3929;
  --color-text-secondary: #6B6253;
  --color-text-muted: #8E8676;

  --color-primary: #D97757;
  --color-primary-hover: #C66544;
  --color-primary-soft: #F4E4DB;
  --color-primary-deep: #A04A2E;

  --color-border: #E5E0D5;
  --color-border-strong: #CFC8B8;

  --color-success: #5C8A5C;
  --color-success-soft: #E0EDDF;
  --color-warning: #D4A555;
  --color-warning-soft: #FBF1DD;
  --color-danger: #C66B5C;
  --color-danger-soft: #F8E0DA;
  --color-info: #5B7C99;
  --color-info-soft: #DDE6EF;

  /* 图表用色 (与主题协调) */
  --chart-1: #D97757;
  --chart-2: #C49B6A;
  --chart-3: #8FA68E;
  --chart-4: #6B8FA8;
  --chart-5: #B589C2;
  --chart-6: #C26B6B;
  --chart-7: #6FAEA5;
  --chart-8: #A89B5C;

  /* 字号 */
  --fs-display: 48px;
  --fs-h1: 32px;
  --fs-h2: 24px;
  --fs-h3: 20px;
  --fs-body: 16px;
  --fs-small: 14px;
  --fs-tiny: 12px;

  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(61, 57, 41, 0.04);
  --shadow-md: 0 2px 8px rgba(61, 57, 41, 0.06);
  --shadow-lg: 0 8px 24px rgba(61, 57, 41, 0.08);

  /* 字体 */
  --font-serif: "Tiempos Headline", "Source Han Serif SC", "Noto Serif CJK SC",
                "Songti SC", "STSong", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-text);
  letter-spacing: -0.01em;
  font-weight: 600;
  line-height: 1.25;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
p { color: var(--color-text); }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--color-primary-hover); }

.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }
.text-primary { color: var(--color-primary); }
.text-small { font-size: var(--fs-small); }
.text-tiny { font-size: var(--fs-tiny); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }

/* ---------- 容器 ---------- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
.container-narrow { max-width: 760px; }
.container-wide { max-width: 1400px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: inherit;
  font-size: var(--fs-body);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  line-height: 1.4;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary { background: var(--color-primary); color: #FFFFFF; }
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn-secondary {
  background: var(--color-card);
  color: var(--color-text);
  border-color: var(--color-border-strong);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-card-hover);
  border-color: var(--color-text-muted);
}

.btn-ghost { background: transparent; color: var(--color-text-secondary); }
.btn-ghost:hover:not(:disabled) {
  background: var(--color-card-soft);
  color: var(--color-text);
}

.btn-danger {
  background: transparent;
  color: var(--color-danger);
  border-color: var(--color-border);
}
.btn-danger:hover:not(:disabled) {
  background: var(--color-danger);
  color: white;
  border-color: var(--color-danger);
}

.btn-lg { padding: 14px 32px; font-size: 17px; }
.btn-sm { padding: 6px 14px; font-size: var(--fs-small); }
.btn-block { width: 100%; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}
.card-hover {
  transition: all 0.2s;
  cursor: pointer;
}
.card-hover:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.card-soft { background: var(--color-card-soft); border-color: var(--color-border); }

/* ---------- 表单 ---------- */
label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-text);
}

input[type="text"], input[type="password"], input[type="email"],
input[type="number"], input[type="datetime-local"], input[type="date"],
input[type="search"], textarea, select {
  width: 100%;
  padding: 10px 14px;
  font-family: inherit;
  font-size: var(--fs-body);
  color: var(--color-text);
  background: var(--color-card);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}
textarea { resize: vertical; min-height: 100px; line-height: 1.6; }

/* 自定义单/复选 */
.option-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s;
  background: var(--color-card);
  margin-bottom: 8px;
  user-select: none;
}
.option-item:hover {
  background: var(--color-card-hover);
  border-color: var(--color-border-strong);
}
.option-item.selected {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
}
.option-item input[type="radio"],
.option-item input[type="checkbox"] {
  margin-top: 4px;
  flex-shrink: 0;
  accent-color: var(--color-primary);
  width: 16px;
  height: 16px;
  cursor: pointer;
}
.option-item .option-label {
  flex: 1;
  color: var(--color-text);
  line-height: 1.5;
}
.option-other-input { margin-left: 28px; margin-top: 8px; }

/* ---------- 提示 ---------- */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid;
  margin-bottom: 16px;
  font-size: var(--fs-small);
  line-height: 1.6;
}
.alert-info {    background: var(--color-info-soft);    border-color: #C7D4E0; color: #3D5063; }
.alert-warning { background: var(--color-warning-soft); border-color: #E8D7A0; color: #7A5C1E; }
.alert-danger {  background: var(--color-danger-soft);  border-color: #E8B5A8; color: #8C3A2C; }
.alert-success { background: var(--color-success-soft); border-color: #B7D2B7; color: #3D5E3D; }

/* ---------- 徽标 ---------- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--fs-tiny);
  font-weight: 500;
  border-radius: 6px;
  background: var(--color-card-soft);
  color: var(--color-text-secondary);
  white-space: nowrap;
}
.badge-primary { background: var(--color-primary-soft); color: var(--color-primary-hover); }
.badge-success { background: var(--color-success-soft); color: #3D5E3D; }
.badge-info {    background: var(--color-info-soft);    color: #3D5266; }
.badge-warning { background: var(--color-warning-soft); color: #7A5A2C; }
.badge-danger  { background: var(--color-danger-soft);  color: #8C3A2C; }

/* ---------- 进度条 ---------- */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-card-soft);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  transition: width 0.3s ease;
  border-radius: 3px;
}

/* ---------- 加载 ---------- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
.spinner-lg { width: 32px; height: 32px; border-width: 3px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Logo ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--color-text);
  text-decoration: none;
}
.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
}

/* ---------- Flex / 工具类 ---------- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: 4px; } .gap-2 { gap: 8px; } .gap-3 { gap: 12px; }
.gap-4 { gap: 16px; } .gap-6 { gap: 24px; }

.mt-1 { margin-top: 4px; } .mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; } .mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; } .mt-8 { margin-top: 32px; }

.mb-1 { margin-bottom: 4px; } .mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; } .mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; } .mb-8 { margin-bottom: 32px; }

.ml-2 { margin-left: 8px; } .ml-3 { margin-left: 12px; }
.mr-2 { margin-right: 8px; } .mr-3 { margin-right: 12px; }

.p-4 { padding: 16px; } .p-6 { padding: 24px; }
.py-2 { padding-top: 8px; padding-bottom: 8px; }
.py-4 { padding-top: 16px; padding-bottom: 16px; }
.py-8 { padding-top: 32px; padding-bottom: 32px; }
.py-12 { padding-top: 48px; padding-bottom: 48px; }

.w-full { width: 100%; }
.hidden { display: none !important; }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: var(--color-text-muted); }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  :root {
    --fs-display: 36px;
    --fs-h1: 26px;
    --fs-h2: 20px;
    --fs-h3: 18px;
  }
  .container { padding: 0 16px; }
  .card { padding: 20px; }
  .btn-lg { padding: 12px 24px; font-size: 16px; }
}