/* ==========================================================================
 * components/nav.css — 顶部悬浮胶囊导航（含磁吸力场与音乐开关）
 * ========================================================================== */

.site-nav {
  position: fixed;
  top: 1.25rem;
  /* 刘海屏 / 灵动岛：把胶囊往下压出安全区 */
  top: calc(1.25rem + env(safe-area-inset-top, 0px));
  left: 0;
  right: 0;
  z-index: 100;
  pointer-events: none;
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4.5vw, 4rem);
  padding-left: max(clamp(1.25rem, 4.5vw, 4rem), env(safe-area-inset-left));
  padding-right: max(clamp(1.25rem, 4.5vw, 4rem), env(safe-area-inset-right));
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}
.brand-badge {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  padding: 0.5rem 1.1rem;
  border-radius: 99px;
  text-decoration: none;
  color: var(--ink-main);
  box-shadow: 0 8px 24px rgba(30, 42, 36, 0.05);
  transition: transform 0.35s var(--ease-out-expo), border-color 0.3s ease;
}
.brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-sage);
}
.brand-title {
  font-family: var(--font-serif-en);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.nav-pill-group {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem;
  border-radius: 99px;
  box-shadow: 0 8px 24px rgba(30, 42, 36, 0.05);
}
.nav-link {
  font-family: var(--font-serif-zh);
  font-size: 0.9rem;
  color: var(--ink-body);
  text-decoration: none;
  padding: 0.35rem 0.95rem;
  border-radius: 99px;
  transition: background 0.3s ease, color 0.3s ease, transform 0.25s var(--ease-out-expo);
  display: inline-block;
}

/* 音乐开关：状态由 js/modules/piano-player.js 切换 .playing */
.nav-music-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--surface-card);
  background: var(--forest-deep);
  border: none;
  padding: 0.42rem 0.95rem;
  border-radius: 99px;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.25s var(--ease-out-expo);
}
.music-bars {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 10px;
}
.music-bars i {
  width: 2px;
  background: var(--accent-ochre);
  display: block;
  height: 3px;
  transition: height 0.2s ease;
}
.nav-music-btn.playing .music-bars i:nth-child(1) { animation: barBounce 0.6s infinite ease-in-out; }
.nav-music-btn.playing .music-bars i:nth-child(2) { animation: barBounce 0.6s 0.15s infinite ease-in-out; }
.nav-music-btn.playing .music-bars i:nth-child(3) { animation: barBounce 0.6s 0.3s infinite ease-in-out; }
@keyframes barBounce {
  0%, 100% { height: 3px; }
  50% { height: 10px; }
}

/* ---------------------------------------------------------------------------
   悬停态：只在真正有指针的设备上生效。
   触屏点一下会留下粘滞的 :hover，胶囊会一直保持按下态的背景色，很脏。
   --------------------------------------------------------------------------- */
@media (hover: hover) and (pointer: fine) {
  .brand-badge:hover {
    border-color: var(--border-strong);
  }
  .nav-link:hover {
    background: rgba(74, 107, 86, 0.12);
    color: var(--ink-main);
  }
  .nav-music-btn:hover {
    background: var(--accent-sage);
  }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 960px) {
  .nav-link {
    display: none;
  }
}

@media (max-width: 640px) {
  .site-nav {
    top: calc(0.85rem + env(safe-area-inset-top, 0px));
  }
  .brand-badge {
    gap: 0.5rem;
    padding: 0.42rem 0.85rem;
  }
  .brand-title {
    font-size: 1.05rem;
  }
  .nav-music-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.66rem;
  }
}

@media (max-width: 420px) {
  .brand-badge {
    padding: 0.38rem 0.7rem;
  }
  .brand-title {
    font-size: 0.98rem;
  }
  .nav-music-btn {
    padding: 0.36rem 0.62rem;
  }
}