/* RPAdev - 品牌样式 */
:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-soft: rgba(88, 166, 255, 0.15);
  --success: #3fb950;
  --font-sans: "DM Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* 导航 */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* 统一字重与预留下划线空间，切换页面时导航布局不变 */
.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

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

.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
  pointer-events: none;
  cursor: default;
}

/* 免费远程：导航首位 + 突出样式（引流核心） */
.nav-links a.nav-link--featured {
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.35rem 0.6rem;
  margin: -0.35rem 0;
  border-radius: 8px;
  border-bottom-color: transparent;
}

.nav-links a.nav-link--featured:hover {
  background: rgba(88, 166, 255, 0.25);
  color: var(--accent);
  text-decoration: none;
}

.nav-links a.nav-link--featured.active {
  background: var(--accent-soft);
  color: var(--accent);
}

.nav-link-badge {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.4rem;
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--bg);
  background: var(--success);
  border-radius: 4px;
  vertical-align: middle;
}

/* 主内容区 */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 2rem;
}

/* 区块标题 */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

/* 飞书文档卡片 */
.doc-cards {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.doc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.doc-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.doc-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.doc-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0 0 1rem;
  line-height: 1.5;
}

.doc-card a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.doc-card a::after {
  content: "→";
}

/* 私域 CTA 区块 */
.cta-box {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  margin: 2rem 0;
}

.cta-box h2 {
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
}

.cta-box p {
  color: var(--text-muted);
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

.qr-placeholder {
  width: 160px;
  height: 160px;
  margin: 0 auto 1rem;
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.qr-img {
  display: block;
  width: 160px;
  height: 160px;
  margin: 0 auto 1rem;
  border-radius: var(--radius);
  object-fit: cover;
}

.cta-box--highlight {
  border-width: 2px;
  padding: 1.75rem;
}

.steps-list {
  padding-left: 1.5rem;
  margin: 0 0 1rem;
}

.steps-list li {
  margin-bottom: 0.75rem;
  padding-left: 0.25rem;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.link-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.link-list li:last-child {
  border-bottom: none;
}

.link-list a { font-weight: 500; }

.tip-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.tip-list li {
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: var(--surface);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
}

.btn:hover {
  filter: brightness(1.1);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

/* 常见问题列表 */
.faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-list li {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.faq-list li:last-child {
  border-bottom: none;
}

.faq-list strong {
  display: block;
  margin-bottom: 0.35rem;
}

.faq-list p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 页脚 */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer a {
  color: var(--text-muted);
}

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