/**
 * 道系氛围层 · CSS
 * ----------------------------------------
 * 模块开关（靠 body class / 媒体查询）：
 * - 默认开启：边角静态纹样、水墨分割线、便签轻阴影
 * - 动态开启条件：非 .dao-formal，且未开启 prefers-reduced-motion
 * - .dao-formal（登录/注册/协议）：仅极淡静态纹理，动画全关
 * - prefers-reduced-motion：全部 animation / transition 动效关闭
 *
 * z-index：装饰永远在最底层（.dao-layer = 0），正文内容相对更高。
 */

/* ========== 1. 变量与底层 ========== */
:root {
  --dao-ink: #5a6552;
  --dao-paper: #e9ebe4;
  --dao-corner-opacity: 0.1;
  --dao-mist-opacity: 0.08;
}

/* 仅抬高页面主体；切勿命中 .inspire-layer（否则 fixed 弹层被压成 relative） */
body.fit > #site-page,
body.write-page > #site-page {
  position: relative;
  z-index: 1;
}

/* ========== 2. 氛围层容器（静态骨架） ========== */
.dao-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  color: var(--dao-ink);
}

/* 左上 / 右下 边角枯笔远山与淡云（另两角留白，不对称） */
.dao-corner {
  position: absolute;
  opacity: var(--dao-corner-opacity);
  display: none;
}

body.dao-formal .dao-corner {
  display: block;
}

.dao-corner svg {
  display: block;
  width: 100%;
  height: auto;
}

.dao-corner-tl {
  top: 2.5vh;
  left: 1.2vw;
  width: min(220px, 34vw);
}

.dao-corner-br {
  right: 1.5vw;
  bottom: 3vh;
  width: min(260px, 40vw);
  opacity: 0.09;
}

/* 底雾与 ink-hills 抢戏，全站关闭 */
.dao-mist {
  display: none !important;
}

/* ========== 3. 枯笔断续水墨分割线 ========== */
.dao-rule,
.ink-rule {
  display: block;
  width: 100%;
  height: 10px;
  margin: 28px 0;
  border: 0;
  background:
    radial-gradient(circle at 8% 50%, rgba(90, 101, 82, 0.35) 0 1.1px, transparent 1.4px),
    radial-gradient(circle at 22% 42%, rgba(90, 101, 82, 0.28) 0 0.9px, transparent 1.2px),
    radial-gradient(circle at 41% 58%, rgba(90, 101, 82, 0.32) 0 1px, transparent 1.3px),
    radial-gradient(circle at 63% 45%, rgba(90, 101, 82, 0.25) 0 0.85px, transparent 1.15px),
    radial-gradient(circle at 78% 55%, rgba(90, 101, 82, 0.3) 0 1px, transparent 1.3px),
    radial-gradient(circle at 92% 48%, rgba(90, 101, 82, 0.22) 0 0.8px, transparent 1.1px),
    linear-gradient(
      90deg,
      transparent 0%,
      rgba(90, 101, 82, 0.18) 12%,
      transparent 18%,
      transparent 28%,
      rgba(90, 101, 82, 0.14) 40%,
      transparent 46%,
      transparent 58%,
      rgba(90, 101, 82, 0.16) 70%,
      transparent 76%,
      transparent 86%,
      rgba(90, 101, 82, 0.12) 94%,
      transparent 100%
    );
  background-size: 100% 100%;
  background-repeat: no-repeat;
  opacity: 0.7;
}

/* 随笔条目：不再画顶部分割横线 */
.note {
  border-top: 0 !important;
  position: relative;
}

.note::before {
  content: none;
  display: none;
}

/* 页脚：无顶部分割线（版权已固定在壳层） */
.site-footer {
  border-top: 0 !important;
}

.site-footer::before {
  content: none;
  display: none;
}

/* ========== 4. 便签卡片：毛边已有，补轻薄纸感与克制 hover ========== */
.slip {
  background: #f3f0e7 !important;
  filter: drop-shadow(0 4px 10px rgba(48, 42, 34, 0.05)) !important;
  transition:
    transform 0.7s ease,
    filter 0.7s ease;
}

.slip-1 {
  background: #f6f3eb !important;
}

body.reading-page .slip {
  filter: none !important;
}

/* ========== 6. 滚动淡入（仅 opacity，由 .dao-reveal / .is-in 控制） ========== */
.dao-reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.dao-reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

html:not(.js-ready) .dao-reveal,
.dao-formal .dao-reveal,
.note.dao-reveal,
.slip.dao-reveal,
.profile-card.dao-reveal,
.slip-month.dao-reveal,
.scrap-leaf.dao-reveal {
  /* 具体显隐由 JS 加 is-in；无 JS 时可见 */
}

html:not(.js-ready) .dao-reveal {
  opacity: 1;
  transform: none;
}

/* 兼容旧选择器：统一为仅淡入 */
.note,
.profile-card,
.page-body > p,
.slip-month,
.scrap-leaf,
.slip {
  /* 覆盖旧 translateY 入场：见下方 reduce / formal 清理 */
}

/* ========== 8. 动态：仅非正式页 + 未减少动画（无循环晃动） ========== */
@media (prefers-reduced-motion: no-preference) {
  body:not(.dao-formal) .slip:hover {
    filter: drop-shadow(0 5px 12px rgba(48, 42, 34, 0.07)) !important;
  }

  body:not(.dao-formal) .slip.slip-0:hover,
  body:not(.dao-formal) .slip:not(.slip-1):not(.slip-2):hover {
    transform: rotate(-1.4deg);
  }

  body:not(.dao-formal) .slip-1:hover {
    transform: rotate(1.6deg);
  }

  body:not(.dao-formal) .slip-2:hover {
    transform: rotate(-1.6deg);
  }

  body.reading-page:not(.dao-formal) .slip:hover {
    filter: none !important;
    transform: rotate(var(--slip-r, -2.4deg));
  }
}

/* ========== 9. 正式页：仅极淡静态纹理，动画全关 ========== */
.dao-formal .dao-layer {
  opacity: 0.55;
}

.dao-formal .dao-mist {
  display: none;
}

.dao-formal .dao-corner {
  opacity: 0.06;
  animation: none !important;
}

.dao-formal .dao-reveal {
  opacity: 1 !important;
  transform: none !important;
  transition: none !important;
}

.dao-formal .slip:hover {
  transform: none !important;
  filter: drop-shadow(0 4px 10px rgba(48, 42, 34, 0.05)) !important;
}

/* 正式页极淡宣纸底纹（不动画） */
/* 正式页不再叠纸噪，让 mist-hills 干净露出 */
.dao-formal::before {
  display: none;
}

/* ========== 10. prefers-reduced-motion：全部动态关闭 ========== */
@media (prefers-reduced-motion: reduce) {
  .dao-mist-flow,
  .dao-corner-tl,
  .dao-corner-br {
    animation: none !important;
  }

  .dao-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .slip {
    transition: none !important;
  }

  .slip:hover {
    transform: none !important;
    filter: drop-shadow(0 4px 10px rgba(48, 42, 34, 0.05)) !important;
  }

  .dao-corner,
  .dao-mist {
    transform: none !important;
  }
}

/* 首页已有 hero 天幕与远山，再挂 dao 层会叠成一团 */
body:has(.hero) .dao-layer {
  display: none;
}