/* ============================================================
   site-nav 组件样式 — 从 styles/site.css 提取的抽屉导航
   供自包含页面（gratitude-design / nt-flow-progression / 募捐 / 报名 / 钱包）
   复用全站抽屉导航。与 SPA 的 drawer 视觉保持一致。
   改动 site.css 的 drawer 部分时，需同步此处。
   ============================================================ */

/* ---- 变量（与 site.css 的 :root 一致，仅抽屉用到的子集） ---- */
.site-nav {
  --drawer-surface: rgba(247, 250, 246, 0.98);
  --line-drawer: #d7e0db;
  --line-muted: #c7d5cb;
  --muted: #55644e;
  --overlay: rgba(101, 118, 122, 0.58);
  --drawer-width: min(316px, 79vw);
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --blue-400: #7a96a6;
  --blue-600: #7d98a8;
}

.site-nav * {
  box-sizing: border-box;
}

/* ---- 菜单按钮基础样式（页首固定按钮与抽屉内关闭按钮共用） ---- */
.site-nav .menu-button {
  width: 42px;
  height: 42px;
  border: 1px solid #b7c7be;
  border-radius: 21px;
  background: rgba(241, 246, 243, 0.92);
  box-shadow: 0 6px 18px rgba(126, 152, 169, 0.1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  flex-direction: column;
  cursor: pointer;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

/* 只有直接挂在 .site-nav 根下的按钮才固定在视口左上角；
   抽屉头部里的那颗是关闭钮，保持在文档流里，否则会盖住品牌名 */
.site-nav > .menu-button {
  position: fixed;
  top: calc(14px + env(safe-area-inset-top, 0px));
  left: calc(14px + env(safe-area-inset-left, 0px));
  z-index: 30;
}

.site-nav .menu-button span {
  width: 14px;
  height: 2px;
  border-radius: 999px;
  background: #5f6f57;
  display: block;
}

.site-nav .menu-button:focus-visible,
.site-nav .drawer-link:focus-visible {
  outline: 2px solid rgba(82, 100, 110, 0.82);
  outline-offset: 3px;
}

/* ---- 遮罩与抽屉主体 ---- */
.site-nav .drawer-backdrop {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity 240ms ease;
  z-index: 40;
}

.site-nav .drawer {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--drawer-width);
  max-width: 100%;
  background: var(--drawer-surface);
  border-right: 1px solid #cbd6d1;
  box-shadow: 18px 0 40px rgba(82, 99, 95, 0.1);
  transform: translateX(-100%);
  transition: transform 280ms ease;
  padding: 28px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  z-index: 41;
  touch-action: pan-y;
  overflow: hidden;
}

.site-nav[data-open="true"] .drawer-backdrop {
  opacity: 1;
  pointer-events: auto;
}

.site-nav[data-open="true"] .drawer {
  transform: translateX(0);
}

body.site-nav-open {
  overflow: hidden;
}

/* ---- 抽屉头 ---- */
.site-nav .drawer__header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-nav .drawer__brand {
  display: flex;
  flex-direction: column;
}

.site-nav .drawer__brand-title {
  margin: 0;
  color: #364a50;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
}

/* ---- 导航列表 ---- */
.site-nav .drawer__nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 0;
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  padding-right: 6px;
  scrollbar-gutter: stable;
}

.site-nav .drawer__nav::-webkit-scrollbar {
  width: 8px;
}

.site-nav .drawer__nav::-webkit-scrollbar-track {
  background: rgba(215, 224, 219, 0.55);
  border-radius: 999px;
}

.site-nav .drawer__nav::-webkit-scrollbar-thumb {
  background: rgba(112, 129, 134, 0.65);
  border-radius: 999px;
}

.site-nav .drawer-link {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  padding: 10px;
  border-radius: 18px;
  border: 1px solid var(--line-drawer);
  background: rgba(249, 251, 248, 0.96);
  color: #55644e;
  position: relative;
  flex: 0 0 auto;
}

.site-nav .drawer-link.is-active {
  background: #e8eee9;
}

.site-nav .drawer-link__index {
  width: 38px;
  height: 38px;
  border-radius: 18px;
  border: 1px solid var(--line-drawer);
  background: #eef3ef;
  color: #47626f;
  font-family: var(--font-serif);
  font-size: 16px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
}

.site-nav .drawer-link.is-active .drawer-link__index {
  background: #d8e5de;
  border-color: #d8e5de;
}

.site-nav .drawer-link__copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 158px;
  min-width: 0;
  flex: 1 1 auto;
}

.site-nav .drawer-link__title {
  color: #364a50;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
}

.site-nav .drawer-link__subtitle {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.25;
}

.site-nav .drawer-link__arrow {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

/* ---- 抽屉尾 ---- */
.site-nav .drawer__footer {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 0 0 auto;
}

.site-nav .drawer__footer-rule {
  height: 1px;
  background: var(--line-muted);
}

.site-nav .drawer__footer p {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 11px;
  line-height: 1.25;
}

.site-nav .drawer__bird {
  position: absolute;
  right: 4px;
  bottom: 0;
  width: 154px;
  height: 154px;
  object-fit: contain;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .site-nav .drawer,
  .site-nav .drawer-backdrop {
    transition: none;
  }
}