/* =====================================================================
 * PDFnoted · 全局组件样式 (Unified Components)
 * 统一按钮 / 卡片 / 区块标题 / 标签 / 导航
 * 与 tokens.css 配合使用；逐步替代各页面的内联样式。
 * ===================================================================== */

/* ---------- 按钮 ---------- */
.btn,
.btn-primary,
.btn-secondary,
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 22px; border-radius: var(--radius-md);
  font-size: 15px; font-weight: 600; cursor: pointer; text-decoration: none;
  font-family: inherit; border: 1px solid transparent; transition: all .18s ease;
  box-sizing: border-box;
}
.btn-primary { background: var(--brand-grad); color: #fff; box-shadow: 0 8px 22px rgba(79, 70, 229, .28); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(79, 70, 229, .36); }
.btn-secondary { background: #fff; color: var(--brand); border-color: var(--brand); }
.btn-secondary:hover { background: var(--brand-light); }
.btn-ghost { background: #fff; color: var(--text-primary); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- 区块标题 ---------- */
.section-head { text-align: center; margin-bottom: 36px; }
.section-head h2 { font-size: 1.7rem; font-weight: 800; color: var(--text-primary); margin: 0 0 8px; letter-spacing: -.02em; }
.section-head p { font-size: 1rem; color: var(--text-secondary); margin: 0; line-height: 1.6; }

/* ---------- 卡片 ---------- */
.card {
  display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px; text-decoration: none;
  transition: all .2s ease; color: var(--text-primary);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--brand); }
.card-icon { font-size: 26px; margin-bottom: 12px; }
.card h3 { font-size: 1.05rem; font-weight: 700; margin: 0 0 8px; }
.card p { font-size: .9rem; color: var(--text-secondary); margin: 0 0 12px; line-height: 1.6; }

/* ---------- 标签 ---------- */
.tag {
  display: inline-block; font-size: 11px; font-weight: 600; padding: 3px 10px;
  border-radius: 999px; background: var(--brand-light); color: var(--brand);
}
.tag.pro { background: #f5f3ff; color: #7c3aed; }
.tag.kbd { background: #f1f5f9; color: var(--text-secondary); }
.tag.free { background: #ecfdf5; color: var(--success); }

/* ---------- 网格 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 18px; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- 步骤 ---------- */
.step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px 24px; }
.step-num {
  width: 40px; height: 40px; border-radius: 50%; background: var(--brand-grad); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 18px; margin-bottom: 14px;
}
.step h3 { font-size: 1.1rem; font-weight: 700; margin: 0 0 8px; color: var(--text-primary); }
.step p { font-size: .92rem; color: var(--text-secondary); margin: 0; line-height: 1.6; }

/* ---------- 顶部导航 ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .94); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-nav .nav-inner { max-width: var(--container); margin: 0 auto; padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.site-nav .brand { display: flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 700; color: var(--text-primary); font-size: 17px; }
.site-nav .brand .logo { background: var(--brand-grad); color: #fff; width: 32px; height: 32px; border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; font-weight: 800; }
.site-nav .nav-links { display: flex; gap: 4px; align-items: center; }
.site-nav .nav-links a { padding: 8px 14px; color: var(--text-secondary); text-decoration: none; border-radius: var(--radius-sm); font-weight: 600; font-size: 14px; }
.site-nav .nav-links a:hover { color: var(--brand); background: var(--brand-light); }
.site-nav .nav-links a.active { color: var(--brand); background: var(--brand-light); }

/* ---------- 导航下拉 ---------- */
.nav-dropdown { position: relative; }
.nav-dropdown > .nav-dropdown-toggle { display: inline-flex; align-items: center; gap: 4px; }
.nav-dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 220px; margin-top: 8px;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-md); padding: 8px; display: none; z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a { display: block; padding: 8px 12px; border-radius: var(--radius-sm); color: var(--text-secondary); text-decoration: none; font-size: 14px; }
.nav-dropdown-menu a:hover { background: var(--brand-light); color: var(--brand); }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .site-nav .nav-links { gap: 0; }
  .site-nav .nav-links a { padding: 8px 10px; font-size: 13px; }
}
@media (max-width: 480px) {
  .grid { grid-template-columns: 1fr; }
  .section-head h2 { font-size: 1.4rem; }
}

/* ---------- 导航：品牌 / 登录 / 用户 ---------- */
.site-nav .brand .brand-pill {
  font-size: 11px; font-weight: 700; color: var(--brand);
  background: var(--brand-light); padding: 2px 8px; border-radius: 999px; margin-left: 2px;
}
.site-nav .nav-login { color: var(--brand) !important; }
.site-nav .nav-user-chip {
  display: none; align-items: center; gap: 8px; padding: 4px 10px 4px 4px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 999px; cursor: pointer;
}
.site-nav .nav-user-avatar { width: 28px; height: 28px; border-radius: 50%; display: block; }
.site-nav .nav-user-name { font-size: 13px; font-weight: 600; color: var(--text-primary); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.site-nav .nav-user-plan { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; }
.site-nav .nav-user-plan.pro { background: #dcfce7; color: var(--success); }
.site-nav .nav-user-plan.free { background: #e0e7ff; color: var(--brand); }
.site-nav .nav-mobile-btn {
  display: none; background: none; border: 1px solid var(--border); border-radius: 8px;
  width: 40px; height: 40px; font-size: 18px; cursor: pointer; color: var(--text-secondary);
}
@media (max-width: 768px) {
  .site-nav .nav-mobile-btn { display: inline-flex; align-items: center; justify-content: center; }
  .site-nav .nav-links {
    position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--border); padding: 10px 16px; gap: 4px;
    box-shadow: var(--shadow-md); display: none;
  }
  .site-nav .nav-links.open { display: flex; }
  /* 移动端整个菜单已折叠，下拉项直接平铺，避免依赖 hover（触屏不可靠） */
  .site-nav .nav-dropdown-menu {
    position: static; box-shadow: none; border: none; padding: 0 0 0 12px;
    min-width: 0; margin-top: 0; display: block;
  }
  .site-nav .nav-dropdown-menu a { font-size: 13px; color: var(--text-muted); }
  .site-nav .nav-dropdown > .nav-dropdown-toggle span { display: none; }
  /* 触摸目标 ≥44px */
  .site-nav .nav-links > a,
  .site-nav .nav-dropdown > .nav-dropdown-toggle { min-height: 44px; display: flex; align-items: center; }
}