:root {
  color-scheme: light;
  --bg: #f3f7f6;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --border: #d1d5db;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, #f0fdfa 0%, var(--bg) 100%);
  color: var(--text);
}


.top-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(6px);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.top-nav a {
  color: #0f172a;
  text-decoration: none;
  font-weight: 600;
}

.top-nav nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 56px;
}

.card {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 24px;
  box-shadow: 0 8px 26px rgba(15, 118, 110, 0.08);
  margin-bottom: 16px;
}

.hidden {
  display: none;
}

h1,
h2,
h3 {
  margin: 10px 0 12px;
  line-height: 1.3;
}

.subtitle {
  font-size: 1.03rem;
}

.pill {
  display: inline-block;
  font-size: 0.84rem;
  color: var(--primary-dark);
  border: 1px solid #99f6e4;
  background: #ecfeff;
  border-radius: 999px;
  padding: 4px 10px;
}

.btn-primary,
.btn-secondary {
  appearance: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 1rem;
  cursor: pointer;
}

.btn-primary {
  border: 0;
  color: #fff;
  background: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  border: 1px solid var(--border);
  background: #fff;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-wrap {
  margin-bottom: 16px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #e5e7eb;
  overflow: hidden;
}

.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  transition: width 180ms ease-in-out;
  background: linear-gradient(90deg, #14b8a6, #0f766e);
}

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

.option-btn {
  text-align: left;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
}

.option-btn:hover {
  border-color: #5eead4;
  background: #f0fdfa;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.tags {
  color: var(--primary-dark);
  font-weight: 600;
}


.seo-copy ul {
  padding-left: 18px;
}

.seo-copy a {
  color: #0f766e;
}

.faq details {
  border-top: 1px solid #e5e7eb;
  padding: 8px 0;
}

footer {
  text-align: center;
  color: var(--muted);
  padding: 0 16px 20px;
}