/* Linsense 统一样式：灰白底 + 科技蓝强调（方案 A） */
:root {
  --bg: #F7F9FC;
  --text: #111827;
  --muted: #6B7280;
  --line: #E5E7EB;
  --primary: #2563EB;
  --primaryDark: #1D4ED8;
  --card-bg: #FFFFFF;
  --card-border: #E5E7EB;
  /* 毛玻璃卡片 */
  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-border: rgba(255, 255, 255, 0.85);
  --glass-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --glass-blur: 12px;
  --container-max: 1040px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  background-image: radial-gradient(circle at top right, rgba(37, 99, 235, 0.04), transparent 50%);
}

/* 顶部导航 */
.site-nav {
  padding: 1.5rem 1.5rem 1rem;
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.site-nav .brand {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--primary);
  text-decoration: none;
}
.site-nav .brand:hover {
  color: var(--primaryDark);
}

.site-nav .links {
  display: flex;
  gap: 2rem;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav .links a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

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

.site-nav .links a.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* 主容器 */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

/* 页面标题区 */
.page-header {
  padding: 4rem 0 3rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  margin: 0 0 0.75rem;
  color: var(--text);
}

.page-header .subtitle {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto;
}

/* 分段 */
.section {
  margin-bottom: 3rem;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

/* 卡片网格 */
.cards {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 1rem;
  padding: 1.5rem 1.75rem;
  box-shadow: var(--glass-shadow);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin: 0 0 0.5rem;
}

.card p {
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

/* 段落块 */
.prose {
  color: var(--muted);
  line-height: 1.8;
  font-size: 0.9375rem;
}

.prose p {
  margin: 0 0 1rem;
}

.prose p:last-child {
  margin-bottom: 0;
}

/* 列表（价值观等） */
.value-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.value-list li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.value-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: 50%;
}

/* 页尾标语 */
.page-tagline {
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

/* 底部 footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 1.5rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--muted);
}

/* 免责声明块（毛玻璃卡片风格） */
.disclaimer {
  margin-top: 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 0.75rem;
  box-shadow: var(--glass-shadow);
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.7;
}

/* CTA 链接 */
.cta-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--primary);
  padding-bottom: 2px;
}

.cta-link:hover {
  color: var(--primaryDark);
  border-bottom-color: var(--primaryDark);
}

/* 联系表单 */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  max-width: 480px;
  padding: 0.6rem 0.75rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--text);
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 0.25rem;
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-submit {
  margin-top: 1rem;
  padding: 0.65rem 1.5rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: #FFFFFF;
  background: var(--primary);
  border: none;
  border-radius: 0.25rem;
  cursor: pointer;
  letter-spacing: 0.05em;
}

.form-submit:hover {
  background: var(--primaryDark);
}

.form-hint {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.6;
}

/* 首页大标题区 */
.hero {
  min-height: 75vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem 1.5rem 4rem;
}

.hero .eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
  line-height: 1.2;
}

.hero h1 .gold {
  color: var(--primary);
}

.hero .lead {
  max-width: 36em;
  font-size: 1.0625rem;
  color: var(--muted);
  line-height: 1.7;
  margin: 0 0 2rem;
}

.hero .line {
  width: 1px;
  height: 5rem;
  background: linear-gradient(to bottom, var(--primary), transparent);
}

.hero-cards {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.hero-cards .card {
  padding: 2rem;
}

.hero-cards .card h3 {
  font-size: 1.125rem;
}

@media (max-width: 640px) {
  .site-nav .links {
    gap: 1.25rem;
    font-size: 0.75rem;
  }
}