/* 鱼店通 · 官网样式
 * 设计规范：浅色主题（白底 / 灰边框 / 蓝色高亮），主色 #2563EB
 */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.08);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 滚动进度条 ---------- */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  z-index: 1000;
}

.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--primary), #60a5fa);
  transition: width 0.1s linear;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo::before {
  content: '';
  display: inline-block;
  width: 26px;
  height: 26px;
  background: var(--primary);
  border-radius: 7px;
  /* 简易鱼形标识：用渐变模拟 */
  background-image: linear-gradient(135deg, #60a5fa 0%, #2563eb 100%);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  font-weight: 500;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 18px;
  color: var(--text);
  cursor: pointer;
}

/* ---------- Hero 区 ---------- */
.hero {
  padding: 96px 0 80px;
  background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

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

.hero p {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  background: #fff;
  color: var(--text);
  border-color: var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 16px;
}

/* ---------- 区块标题 ---------- */
.section {
  padding: 80px 0;
}

.section-head {
  text-align: center;
  margin-bottom: 48px;
}

.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.section-head p {
  font-size: 16px;
  color: var(--text-muted);
}

/* ---------- 功能卡片 ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.25s;
}

.feature-card:hover {
  border-color: #bfdbfe;
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
}

/* ---------- 下载中心 ---------- */
.download-section {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.download-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: all 0.25s;
}

.download-card:hover {
  border-color: #bfdbfe;
  box-shadow: var(--shadow-lg);
}

.download-card .icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.download-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.download-card .desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.download-card .btn {
  width: 100%;
}

.download-card.disabled {
  opacity: 0.6;
}

.download-card.disabled .btn {
  cursor: not-allowed;
  background: var(--border);
  color: var(--text-muted);
  box-shadow: none;
}

/* ---------- 页脚 ---------- */
.footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 56px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer h4 {
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer .brand p {
  font-size: 14px;
  color: #94a3b8;
  margin-top: 12px;
  max-width: 280px;
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 10px;
}

.footer ul a {
  font-size: 14px;
  color: #94a3b8;
  transition: color 0.2s;
}

.footer ul a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: #64748b;
}

.footer-bottom a {
  color: #94a3b8;
}

.footer-bottom a:hover {
  color: #fff;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .hero {
    padding: 64px 0 56px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero p {
    font-size: 16px;
  }

  .section {
    padding: 56px 0;
  }

  .section-head h2 {
    font-size: 26px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 20px;
    border-bottom: 1px solid var(--border);
    gap: 4px;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
  }

  .mobile-menu-btn {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}