:root {
        --bg0: #06111f;
        --bg1: #081b31;
        --bg2: #0c2a4a;
        --panel: rgba(9, 25, 46, 0.78);
        --panel-soft: rgba(14, 38, 66, 0.5);
        --line: rgba(176, 217, 255, 0.18);
        --line-strong: rgba(202, 232, 255, 0.4);
        --text: #eaf5ff;
        --muted: #9fc0de;
        --accent: #79c3ff;
        --accent2: #cbe9ff;
      }
      * { box-sizing: border-box; }
      html, body { width: 100%; height: 100%; }
      body {
        margin: 0;
        overflow: hidden;
        color: var(--text);
        font-family: "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
        background:
          radial-gradient(circle at 15% 10%, rgba(84, 177, 255, 0.12), transparent 22rem),
          radial-gradient(circle at 80% 20%, rgba(94, 163, 255, 0.08), transparent 18rem),
          linear-gradient(135deg, var(--bg0), var(--bg1) 50%, var(--bg2));
      }
      body::before {
        content: "";
        position: fixed;
        inset: 0;
        pointer-events: none;
        background-image:
          linear-gradient(rgba(190, 220, 255, 0.05) 1px, transparent 1px),
          linear-gradient(90deg, rgba(190, 220, 255, 0.05) 1px, transparent 1px);
        background-size: 28px 28px;
        mask-image: linear-gradient(180deg, rgba(0,0,0,0.7), transparent 80%);
      }
      .app {
        position: relative;
        width: 100vw;
        height: 100vh;
        display: grid;
        grid-template-rows: auto 1fr;
      }
      header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        padding: 18px 20px;
        border-bottom: 1px solid rgba(255,255,255,0.06);
        backdrop-filter: blur(16px);
        background: linear-gradient(180deg, rgba(5, 15, 29, 0.82), rgba(5, 15, 29, 0.22));
        z-index: 2;
      }
      .title {
        display: flex;
        flex-direction: column;
        gap: 4px;
      }
      .title h1 {
        margin: 0;
        font-size: clamp(1.1rem, 2vw, 1.45rem);
        letter-spacing: 0.02em;
        font-weight: 700;
      }
      .title p {
        margin: 0;
        color: var(--muted);
        font-size: 0.84rem;
        letter-spacing: 0.06em;
      }
      .toolbar {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-wrap: wrap;
      }
      button {
        appearance: none;
        border: 1px solid var(--line);
        background: rgba(14, 33, 59, 0.72);
        color: var(--text);
        padding: 10px 14px;
        border-radius: 12px;
        font: inherit;
        cursor: pointer;
        transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
      }
      button:hover {
        transform: translateY(-1px);
        border-color: var(--line-strong);
        background: rgba(22, 47, 82, 0.85);
      }
      button.primary {
        background: linear-gradient(180deg, rgba(115, 187, 255, 0.96), rgba(71, 154, 233, 0.96));
        color: #04111f;
        font-weight: 700;
      }
      button.primary.active {
        box-shadow: 0 0 0 1px rgba(203, 233, 255, 0.34), 0 0 34px rgba(121, 195, 255, 0.18);
      }
      main {
        position: relative;
        display: grid;
        grid-template-columns: 260px 1fr;
        min-height: 0;
      }
      .palette {
        border-right: 1px solid rgba(255,255,255,0.06);
        background: linear-gradient(180deg, rgba(8, 25, 46, 0.62), rgba(5, 15, 29, 0.8));
        padding: 18px;
        overflow: auto;
      }
      .panel-label {
        margin: 0 0 12px;
        color: var(--muted);
        font-size: 0.76rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
      }
      .tray {
        display: grid;
        gap: 12px;
      }
      .tray-item {
        display: grid;
        grid-template-columns: 64px 1fr;
        gap: 12px;
        align-items: center;
        padding: 12px;
        border: 1px solid var(--line);
        border-radius: 16px;
        background: rgba(8, 28, 51, 0.66);
        cursor: grab;
        user-select: none;
      }
      .tray-item canvas {
        display: block;
        width: 64px;
        height: 64px;
      }
      .tray-item:active { cursor: grabbing; }
      .tray-item.dragging { opacity: 0.6; }
      .tray-item strong { display: block; margin-bottom: 4px; font-size: 0.98rem; }
      .tray-item span { display: block; color: var(--muted); font-size: 0.8rem; line-height: 1.4; }
      .workspace {
        position: relative;
        overflow: hidden;
      }
      canvas {
        display: block;
        width: 100%;
        height: 100%;
      }
      .hud {
        position: absolute;
        left: 18px;
        bottom: 18px;
        display: grid;
        gap: 10px;
        padding: 14px 16px;
        border: 1px solid rgba(255,255,255,0.08);
        border-radius: 16px;
        background: rgba(7, 19, 35, 0.68);
        backdrop-filter: blur(12px);
        max-width: min(360px, calc(100% - 36px));
      }
      .gear-editor {
        position: absolute;
        left: 18px;
        top: 18px;
        display: none;
        gap: 10px;
        padding: 14px 16px;
        width: min(340px, calc(100% - 36px));
        border: 1px solid rgba(255,255,255,0.08);
        border-radius: 16px;
        background: rgba(7, 19, 35, 0.72);
        backdrop-filter: blur(12px);
      }
      .gear-editor.active { display: grid; }
      .gear-editor h3 {
        margin: 0 0 2px;
        font-size: 1rem;
      }
      .gear-editor .meta {
        color: var(--muted);
        font-size: 0.82rem;
      }
      .gear-editor .actions {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
      }
      .gear-edit-row {
        display: grid;
        gap: 6px;
        color: var(--muted);
        font-size: 0.8rem;
      }
      .gear-edit-row input {
        width: 100%;
        border: 1px solid var(--line);
        border-radius: 10px;
        background: rgba(8, 28, 51, 0.86);
        color: var(--text);
        padding: 10px 12px;
        font: inherit;
        outline: none;
      }
      .gear-edit-row input:focus {
        border-color: var(--line-strong);
        box-shadow: 0 0 0 1px rgba(121, 195, 255, 0.24);
      }
      .gear-editor .actions button {
        padding: 8px 10px;
        border-radius: 10px;
      }
      .gear-editor .danger {
        border-color: rgba(255, 135, 135, 0.38);
        color: #ffd5d5;
      }
      .gear-editor #deleteBtn {
        justify-self: end;
        width: 44px;
        height: 44px;
        display: grid;
        place-items: center;
        padding: 0;
      }
      .hud-row {
        display: flex;
        justify-content: space-between;
        gap: 18px;
        font-size: 0.86rem;
        color: var(--muted);
      }
      .hud-row strong {
        color: var(--text);
        font-weight: 700;
      }
      .hint {
        margin: 0;
        color: var(--muted);
        font-size: 0.84rem;
        line-height: 1.6;
      }
      .badge {
        position: absolute;
        top: 18px;
        right: 18px;
        padding: 10px 12px;
        border: 1px solid rgba(255,255,255,0.08);
        border-radius: 999px;
        background: rgba(7, 19, 35, 0.65);
        color: var(--accent2);
        font-size: 0.82rem;
        letter-spacing: 0.08em;
      }
      @media (max-width: 920px) {
        main { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
        .palette { border-right: 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
      }
      @media (max-width: 640px) {
        header {
          align-items: flex-start;
          flex-direction: column;
        }
        .toolbar { width: 100%; }
        button { width: 100%; }
        .tray-item { grid-template-columns: 58px 1fr; }
        .badge { top: auto; bottom: 18px; right: 18px; left: 18px; text-align: center; }
      }