<div class="dock-wrapper">
<nav class="dock">
  <a href="#" class="dock-item" data-tooltip="Home">
    <svg viewBox="0 0 24 24"><path d="M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z"/></svg>
  </a>
  <a href="#" class="dock-item" data-tooltip="Messages">
    <svg viewBox="0 0 24 24"><path d="M20 2H4c-1.1 0-2 .9-2 2v18l4-4h14c1.1 0 2-.9 2-2V4c0-1.1-.9-2-2-2zm0 14H6l-2 2V4h16v12z"/></svg>
  </a>
  <a href="#" class="dock-item" data-tooltip="Dashboard">
    <svg viewBox="0 0 24 24"><path d="M3 13h8V3H3v10zm0 8h8v-6H3v6zm10 0h8V11h-8v10zm0-18v6h8V3h-8z"/></svg>
  </a>
  <a href="#" class="dock-item" data-tooltip="Settings">
    <svg viewBox="0 0 24 24"><path d="M19.14,12.94c0.04-0.3,0.06-0.61,0.06-0.94c0-0.32-0.02-0.64-0.06-0.94l2.03-1.58c0.18-0.14,0.23-0.41,0.12-0.61 l-1.92-3.32c-0.12-0.22-0.37-0.29-0.59-0.22l-2.39,0.96c-0.5-0.38-1.03-0.7-1.62-0.94L14.4,2.81c-0.04-0.24-0.24-0.41-0.48-0.41 h-3.84c-0.24,0-0.43,0.17-0.47,0.41L9.25,5.35C8.66,5.59,8.12,5.92,7.63,6.29L5.24,5.33c-0.22-0.08-0.47,0-0.59,0.22L2.73,8.87 C2.62,9.08,2.66,9.34,2.86,9.48l2.03,1.58C4.84,11.36,4.8,11.69,4.8,12s0.02,0.64,0.06,0.94l-2.03,1.58 c-0.18,0.14-0.23,0.41-0.12,0.61l1.92,3.32c0.12,0.22,0.37,0.29,0.59,0.22l2.39-0.96c0.5,0.38,1.03,0.7,1.62,0.94l0.36,2.54 c0.05,0.24,0.24,0.41,0.48,0.41h3.84c0.24,0,0.43-0.17,0.47-0.41l0.36-2.54c0.59-0.24,1.13-0.56,1.62-0.94l2.39,0.96 c0.22,0.08,0.47,0,0.59-0.22l1.92-3.32c0.12-0.22,0.07-0.49-0.12-0.61L19.14,12.94z M12,15.6c-1.98,0-3.6-1.62-3.6-3.6 s1.62-3.6,3.6-3.6s3.6,1.62,3.6,3.6S13.98,15.6,12,15.6z"/></svg>
  </a>
  <a href="#" class="dock-item" data-tooltip="Profile">
    <svg viewBox="0 0 24 24"><path d="M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z"/></svg>
  </a>
</nav>
</div>

<style>
.dock-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  padding: 40px 20px;
  background-color: #f8fafc;
  overflow: hidden;
  border-radius: 12px;
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
  .dock-wrapper {
    background-color: #0f172a;
  }
}

.dock {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  padding: 12px;
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.8);
  gap: 12px;
  height: 74px;
  position: relative;
}

@media (prefers-color-scheme: dark) {
  .dock {
    background: rgba(30, 41, 59, 0.5);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  }
}

.dock-item {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #334155;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.25, 1, 0.5, 1);
  position: relative;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08), inset 0 1px 1px rgba(255, 255, 255, 1);
  transform-origin: bottom center;
}

@media (prefers-color-scheme: dark) {
  .dock-item {
    background: linear-gradient(135deg, #334155 0%, #1e293b 100%);
    color: #cbd5e1;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.1);
  }
}

.dock-item svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
  transition: all 0.25s ease;
}

/* ツールチップ */
.dock-item::before {
  content: attr(data-tooltip);
  position: absolute;
  top: -45px;
  background: rgba(15, 23, 42, 0.9);
  color: white;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 500;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

@media (prefers-color-scheme: dark) {
  .dock-item::before {
    background: rgba(255, 255, 255, 0.9);
    color: #0f172a;
  }
}

/* ホバー時の中央要素 */
.dock-item:hover {
  transform: scale(1.4);
  margin: 0 12px;
  z-index: 10;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15), inset 0 1px 1px rgba(255, 255, 255, 1);
}

@media (prefers-color-scheme: dark) {
  .dock-item:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.2);
  }
}

.dock-item:hover::before {
  opacity: 1;
  transform: translateY(0);
}

/* 直近の隣接要素（左右） */
.dock-item:has(+ .dock-item:hover),
.dock-item:hover + .dock-item {
  transform: scale(1.15);
  margin: 0 4px;
  z-index: 5;
}

/* 2つ隣の要素（左右） */
.dock-item:has(+ .dock-item + .dock-item:hover),
.dock-item:hover + .dock-item + .dock-item {
  transform: scale(1.05);
  z-index: 1;
}
</style>