/* ===========================================================
   base.css · 重置、变量、字体、纸纹
   =========================================================== */

:root {
  /* 米杏纸感 */
  --bg-paper: #FAF6EF;
  --bg-card:  #F2EAD9;
  --bg-soft:  #F8F2E4;

  /* 童趣点缀 */
  --c-pink:   #F4D7D7;
  --c-yellow: #F4E7B8;
  --c-mint:   #CFE4D6;
  --c-sky:    #D4E3EE;
  --c-lilac:  #E2D5E6;

  /* 强调与文字 */
  --c-accent: #A56A3C;        /* 焦糖印章 */
  --c-accent-soft: #C99A3F;
  --c-text:   #3D352B;
  --c-text-soft: #7A6E5F;
  --c-line:   #D9CFB8;

  /* 字体 */
  --ff-hand-cn: "ZCOOL KuaiLe", "Ma Shan Zheng", "Noto Serif SC", serif;
  --ff-hand-en: "Caveat", "Cormorant Garamond", cursive;
  --ff-body:    "Cormorant Garamond", "Noto Serif SC", "Inter", serif;
  --ff-num:     "JetBrains Mono", ui-monospace, monospace;

  /* 缓动 */
  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);

  /* 半径 */
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --r-xl: 32px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg-paper);
  color: var(--c-text);
  font-family: var(--ff-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
}

/* 纸纹底（细腻米杏色，叠加细密噪点） */
.paper-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1200px 600px at 12% 6%, #FFF7E7 0%, transparent 60%),
    radial-gradient(900px 500px at 92% 100%, #F1E5C7 0%, transparent 55%),
    var(--bg-paper);
}

/* 噪点（SVG 内联滤镜，无外部依赖） */
.paper-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.78  0 0 0 0 0.69  0 0 0 0 0.55  0 0 0 0.22 0'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.55'/></svg>");
  opacity: 0.45;
  mix-blend-mode: multiply;
}

/* 视图容器 */
.app {
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

.view {
  position: relative;
  width: 100%;
  min-height: 100vh;
}

.view[hidden] {
  display: none !important;
}

/* 视图层叠：cover 在最上，map / hall 在下；橡皮擦擦除 cover 时露出 map */
.view-cover { z-index: 3; }
.view-map   { z-index: 1; }
.view-hall  { z-index: 1; }

/* 幽灵按钮（通用） */
.ghost-btn {
  padding: 8px 16px;
  font-family: var(--ff-hand-en);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--c-text);
  border: 1.5px solid var(--c-line);
  background: rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  transition: all .3s var(--ease);
  backdrop-filter: blur(2px);
}
.ghost-btn:hover {
  background: var(--c-accent);
  color: #fff;
  border-color: var(--c-accent);
  transform: translateY(-1px);
}
.ghost-btn:focus-visible {
  outline: 2px dashed var(--c-accent);
  outline-offset: 3px;
}

/* 顶部导航 */
.top-nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(250, 246, 239, 0.85);
  border: 1px solid var(--c-line);
  border-radius: 999px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(165, 106, 60, 0.08);
  font-family: var(--ff-hand-en);
  font-size: 1.05rem;
  color: var(--c-text-soft);
}
.top-nav button {
  padding: 4px 8px;
  border-radius: 999px;
  transition: color .25s var(--ease);
}
.top-nav button:hover {
  color: var(--c-accent);
}
.top-nav-sep {
  color: var(--c-line);
  user-select: none;
}

/* 通用进入动画 */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===========================================================
   背景音乐开关 · 右下角小圆按钮（低调）
   =========================================================== */
.bgm-toggle {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 60;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(250, 246, 239, 0.78);
  border: 1px solid var(--c-line);
  color: var(--c-accent);
  box-shadow: 0 2px 10px rgba(165, 106, 60, 0.10);
  backdrop-filter: blur(6px);
  transition: background .3s var(--ease), color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
  cursor: pointer;
}
.bgm-toggle:hover {
  background: var(--c-accent);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(165, 106, 60, 0.18);
}
.bgm-toggle:focus-visible {
  outline: 2px dashed var(--c-accent);
  outline-offset: 3px;
}
.bgm-icon {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
}
.bgm-icon svg {
  position: absolute;
  inset: 0;
  margin: auto;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.bgm-toggle.is-on .bgm-icon-on  { opacity: 1; transform: scale(1); }
.bgm-toggle.is-on .bgm-icon-off { opacity: 0; transform: scale(0.6); }
.bgm-toggle.is-off .bgm-icon-on  { opacity: 0; transform: scale(0.6); }
.bgm-toggle.is-off .bgm-icon-off { opacity: 1; transform: scale(1); }

/* 播放中：呼吸光晕 */
.bgm-pulse {
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1px solid var(--c-accent-soft);
  opacity: 0;
  pointer-events: none;
}
.bgm-toggle.is-on .bgm-pulse {
  animation: bgmPulse 2.6s var(--ease-soft) infinite;
}
@keyframes bgmPulse {
  0%   { transform: scale(0.85); opacity: 0.55; }
  70%  { transform: scale(1.25); opacity: 0;    }
  100% { transform: scale(1.25); opacity: 0;    }
}

@media (prefers-reduced-motion: reduce) {
  .bgm-toggle.is-on .bgm-pulse { animation: none; opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
}