/* ========================================
   通用样式 - 重置、布局、水墨底纹、导航栏
   ======================================== */

/* === 基础重置 === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  color: var(--ink-deep);
  background-color: var(--paper);
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}

/* === 宣纸纹理背景 === */
.paper-bg {
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(180,170,150,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(180,170,150,0.06) 0%, transparent 50%);
}

/* === 水墨晕染边框 === */
.ink-border {
  border: 2px solid var(--ink-black);
  box-shadow:
    0 0 0 1px rgba(44,44,44,0.1),
    4px 4px 12px rgba(44,44,44,0.15);
}

/* === 水墨分割线 === */
.ink-divider {
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--ink-light) 20%,
    var(--ink-black) 50%,
    var(--ink-light) 80%,
    transparent 100%);
  margin: var(--spacing-lg) auto;
  max-width: 600px;
}

/* === 通用容器 === */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* === 文字工具类 === */
.text-center { text-align: center; }
.text-title { font-family: var(--font-title); }
.text-body { font-family: var(--font-body); }
.text-sans { font-family: var(--font-sans); }
.text-ink-black { color: var(--ink-black); }
.text-ink-deep { color: var(--ink-deep); }
.text-ink-light { color: var(--ink-light); }
.text-nation-red { color: var(--nation-red); }
.text-nation-gold { color: var(--nation-gold); }
.text-birth-pink { color: var(--birth-pink); }

/* === 通用按钮 === */
.btn {
  display: inline-block;
  padding: 12px 36px;
  font-family: var(--font-sans);
  font-size: 16px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 2px;
  text-decoration: none;
  outline: none;
}

.btn-primary {
  background: var(--ink-black);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--ink-deep);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(44,44,44,0.3);
}

.btn-nation {
  background: var(--nation-red);
  color: var(--white);
}

.btn-nation:hover {
  background: var(--nation-deep);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(192,57,43,0.4);
}

.btn-birth {
  background: var(--birth-pink);
  color: var(--white);
}

.btn-birth:hover {
  background: var(--birth-soft);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(232,180,184,0.4);
}

/* === 页面内容区域 === */
/* 导航栏已取消隐藏，页面内容不再预留顶部高度 */
.page-content {
  padding-top: 0;
  min-height: 100vh;
}

/* === 响应式 === */
@media (max-width: 768px) {
  .container, .container-wide {
    padding: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container, .container-wide {
    padding: var(--spacing-sm);
  }
}

/* === 滚动条美化 === */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--paper-deep);
}

::-webkit-scrollbar-thumb {
  background: var(--ink-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--ink-deep);
}

/* === 音乐盒 - 全局背景音乐悬浮控件 === */
.music-box {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 3000;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(44, 44, 44, 0.72);
  color: var(--paper);
  border: 1px solid rgba(245, 241, 232, 0.35);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.music-box:hover,
.music-box:focus-visible {
  background: rgba(44, 44, 44, 0.9);
  transform: scale(1.06);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.42);
  outline: none;
}

.music-note-icon {
  width: 26px;
  height: 26px;
  display: block;
  opacity: 1;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.music-play-icon {
  position: absolute;
  width: 15px;
  height: 15px;
  opacity: 0;
  transition: opacity 0.3s ease;
  filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}

/* 播放态：音符旋转，播放图标隐藏 */
.music-box.playing .music-note-icon {
  animation: musicSpin 4s linear infinite;
}

.music-box.playing .music-play-icon {
  opacity: 0;
}

/* 暂停/未开启态：音符静止变淡，播放图标浮现 */
.music-box.paused .music-note-icon {
  opacity: 0.45;
  animation: none;
}

.music-box.paused .music-play-icon {
  opacity: 1;
}

/* 提示气泡（自动播放被拦 / 手动暂停时展示） */
.music-hint {
  position: absolute;
  right: 64px;
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: rgba(44, 44, 44, 0.85);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 13px;
  letter-spacing: 1px;
  line-height: 1.4;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

/* 仅用 transform/opacity 的低开销旋转动画 */
@keyframes musicSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* === 音乐盒响应式适配 === */
@media (max-width: 768px) {
  .music-box {
    right: 16px;
    bottom: 16px;
  }
}

@media (max-width: 480px) {
  .music-box {
    width: 46px;
    height: 46px;
    right: 14px;
    bottom: 14px;
  }
  .music-note-icon {
    width: 22px;
    height: 22px;
  }
  .music-hint {
    right: 56px;
    font-size: 12px;
    padding: 5px 10px;
  }
}

@media (max-width: 380px) {
  .music-box {
    width: 42px;
    height: 42px;
    right: 12px;
    bottom: 12px;
  }
  .music-note-icon {
    width: 20px;
    height: 20px;
  }
  .music-play-icon {
    width: 14px;
    height: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .music-box.playing .music-note-icon {
    animation: none;
  }
  .music-box:hover,
  .music-box:focus-visible {
    transform: none;
  }
}