/* ===================== 基础重置 ===================== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --primary-50: #eef2ff;
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

html { font-size: 16px; scroll-behavior: smooth; height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  background-image:
    radial-gradient(at 20% 0%, rgba(79,70,229,.06) 0%, transparent 50%),
    radial-gradient(at 80% 100%, rgba(99,102,241,.05) 0%, transparent 50%);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.view { display: none; min-height: 100vh; min-height: 100dvh; flex-direction: column; }
.view.active { display: flex; }

/* ===================== 问卷视图 ===================== */
#survey-view { align-items: center; justify-content: center; padding: 2rem 1rem; }
.survey-container { width: 100%; max-width: 680px; }

/* 头部 */
.survey-header { text-align: center; margin-bottom: 2.5rem; position: relative; }
.survey-logo {
  width: 64px; height: 64px; margin: 0 auto 1.25rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 18px; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(79,70,229,.3);
}
.survey-logo svg { width: 32px; height: 32px; color: #fff; }
.survey-header h1 { font-size: 1.75rem; font-weight: 700; letter-spacing: -.02em; margin-bottom: .5rem; }
.survey-header p { font-size: 1rem; color: var(--text-light); }

/* 语言切换 */
.lang-toggle {
  position: absolute; top: -8px; right: 0;
  display: inline-flex; border: 1.5px solid var(--border);
  border-radius: 8px; overflow: hidden; background: var(--card-bg);
}
.lang-toggle button {
  padding: .3125rem .625rem; border: none; background: transparent;
  color: var(--text-light); font-size: .75rem; font-weight: 600;
  cursor: pointer; transition: var(--transition); letter-spacing: .02em;
}
.lang-toggle button.active { background: var(--primary); color: #fff; }
.lang-toggle button:not(.active):hover { background: var(--primary-50); color: var(--primary); }

/* 搜索栏 */
.search-bar { position: relative; margin-bottom: 1.25rem; }
.search-bar svg {
  position: absolute; left: 16px; top: 50%; transform: translateY(-50%);
  width: 18px; height: 18px; color: var(--text-lighter); pointer-events: none;
}
.search-bar input {
  width: 100%; padding: .75rem 1rem .75rem 2.75rem;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  font-size: .9375rem; background: var(--card-bg); color: var(--text);
  transition: var(--transition); outline: none;
}
.search-bar input:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.search-bar input::placeholder { color: var(--text-lighter); }

/* 选项列表 */
.options-list { display: flex; flex-direction: column; gap: .75rem; }
.option-card {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.125rem 1.25rem; background: var(--card-bg);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  cursor: pointer; transition: var(--transition); position: relative;
  overflow: hidden; user-select: none;
}
.option-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--primary); transform: scaleY(0); transform-origin: center;
  transition: var(--transition);
}
.option-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); transform: translateY(-2px); }
.option-card:hover::before { transform: scaleY(1); }
.option-card:active { transform: translateY(0); }
.option-icon {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 12px;
  background: var(--primary-50); display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.option-card:hover .option-icon { background: var(--primary); }
.option-icon svg { width: 22px; height: 22px; color: var(--primary); transition: var(--transition); }
.option-card:hover .option-icon svg { color: #fff; }
.option-body { flex: 1; min-width: 0; }
.option-label { font-size: .9375rem; font-weight: 600; margin-bottom: .125rem; color: var(--text); }
.option-desc { font-size: .8125rem; color: var(--text-light); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.option-action { flex-shrink: 0; display: flex; flex-direction: column; align-items: center; gap: 2px; }
.option-action .action-badge {
  font-size: .6875rem; font-weight: 500; color: var(--text-lighter);
  padding: 2px 8px; border-radius: 6px; background: var(--bg); transition: var(--transition);
}
.option-card:hover .action-badge { color: var(--primary); background: var(--primary-50); }
.option-action .action-arrow { width: 18px; height: 18px; color: var(--text-lighter); transition: var(--transition); }
.option-card:hover .action-arrow { color: var(--primary); transform: translateX(3px); }

/* 空状态 */
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-lighter); font-size: .9375rem; }

/* 页脚 */
.survey-footer { text-align: center; margin-top: 2rem; font-size: .8125rem; color: var(--text-lighter); }

/* ===================== 跳转过渡 ===================== */
#redirect-overlay {
  position: fixed; inset: 0; background: rgba(241,245,249,.92);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  display: none; align-items: center; justify-content: center;
  z-index: 9999; opacity: 0; transition: opacity .3s ease;
}
#redirect-overlay.show { display: flex; opacity: 1; }
.redirect-content { text-align: center; }
.redirect-spinner {
  width: 48px; height: 48px; margin: 0 auto 1.25rem;
  border: 4px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.redirect-content p { font-size: 1rem; font-weight: 600; color: var(--text); margin-bottom: .25rem; }
.redirect-url { font-size: .8125rem !important; font-weight: 400 !important; color: var(--text-light); margin-bottom: 1.25rem !important; }
.redirect-cancel {
  padding: .5rem 1.25rem; border: 1.5px solid var(--border); border-radius: 8px;
  background: var(--card-bg); color: var(--text-light); font-size: .875rem;
  cursor: pointer; transition: var(--transition);
}
.redirect-cancel:hover { border-color: var(--primary); color: var(--primary); }

/* 进度条 */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  width: 0; z-index: 10000; transition: width .3s ease;
  box-shadow: 0 0 8px rgba(79,70,229,.4);
}

/* ===================== 内嵌视图 ===================== */
#embed-view { background: var(--bg); height: 100vh; height: 100dvh; min-height: 100vh; min-height: 100dvh; overflow: hidden; }
.embed-header {
  display: flex; align-items: center; gap: 1rem; padding: .75rem 1.25rem;
  background: var(--card-bg); border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm); flex-shrink: 0;
}
.back-btn {
  display: flex; align-items: center; gap: .375rem; padding: .5rem .875rem;
  border: 1.5px solid var(--border); border-radius: 8px; background: var(--card-bg);
  color: var(--text-light); font-size: .875rem; font-weight: 500; cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.back-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-50); }
.back-btn svg { width: 16px; height: 16px; }
.embed-title { flex: 1; font-size: .9375rem; font-weight: 600; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.open-new-btn {
  display: flex; align-items: center; gap: .375rem; padding: .5rem .875rem;
  border: 1.5px solid var(--border); border-radius: 8px; background: var(--card-bg);
  color: var(--text-light); font-size: .875rem; font-weight: 500;
  text-decoration: none; cursor: pointer; transition: var(--transition); white-space: nowrap;
}
.open-new-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-50); }
.open-new-btn svg { width: 16px; height: 16px; }
.iframe-wrapper { flex: 1; position: relative; overflow: hidden; }
#embed-frame { width: 100%; height: 100%; border: none; background: #fff; opacity: 0; transition: opacity .4s ease; }
#embed-frame.loaded { opacity: 1; }
.iframe-loading {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: var(--bg); flex-direction: column; gap: .75rem;
}
.iframe-loading .redirect-spinner { width: 36px; height: 36px; }
.iframe-loading p { font-size: .875rem; color: var(--text-light); }
.iframe-loading.hidden { display: none; }
.iframe-fallback {
  position: absolute; inset: 0; display: none; align-items: center; justify-content: center;
  background: var(--bg); flex-direction: column; gap: 1rem; padding: 2rem; text-align: center;
}
.iframe-fallback.show { display: flex; }
.iframe-fallback .fallback-icon {
  width: 56px; height: 56px; background: #fef3c7; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.iframe-fallback .fallback-icon svg { width: 28px; height: 28px; color: #d97706; }
.iframe-fallback h3 { font-size: 1.0625rem; font-weight: 600; color: var(--text); }
.iframe-fallback p { font-size: .875rem; color: var(--text-light); max-width: 360px; }
.iframe-fallback .fallback-link {
  display: inline-flex; align-items: center; gap: .5rem; padding: .625rem 1.5rem;
  background: var(--primary); color: #fff; border-radius: 10px; text-decoration: none;
  font-size: .875rem; font-weight: 600; transition: var(--transition);
}
.iframe-fallback .fallback-link:hover { background: var(--primary-dark); }
.iframe-fallback .fallback-link svg { width: 16px; height: 16px; }

/* ===================== 入场动画 ===================== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.survey-header { animation: fadeInUp .5s ease both; }
.option-card { animation: fadeInUp .4s ease both; }
.option-card:nth-child(1) { animation-delay: .05s; }
.option-card:nth-child(2) { animation-delay: .10s; }
.option-card:nth-child(3) { animation-delay: .15s; }
.option-card:nth-child(4) { animation-delay: .20s; }
.option-card:nth-child(5) { animation-delay: .25s; }
.option-card:nth-child(6) { animation-delay: .30s; }
.option-card:nth-child(7) { animation-delay: .35s; }
.option-card:nth-child(8) { animation-delay: .40s; }
.search-bar { animation: fadeInUp .4s ease both; animation-delay: .03s; }

/* ===================== 响应式 ===================== */
@media (max-width: 600px) {
  .survey-header h1 { font-size: 1.4rem; }
  .survey-header p { font-size: .875rem; }
  .option-card { padding: 1rem; gap: .75rem; }
  .option-icon { width: 38px; height: 38px; }
  .option-icon svg { width: 18px; height: 18px; }
  .option-label { font-size: .875rem; }
  .option-desc { font-size: .75rem; }
  .option-action .action-badge { display: none; }
  .embed-header { padding: .625rem .875rem; gap: .5rem; }
  .back-btn span, .open-new-btn span { display: none; }
  .lang-toggle { top: -4px; }
}