/* ════════════════════════════════════════════════════════════════════════
 * ui-motion-lab.css — 微交互实验室（小龙 5 微交互 + 西瓜同学高级交互）
 * 仅用 var(--...) 令牌，自动适配主题。纯 CSS/JS 演示，零外部依赖。
 * ════════════════════════════════════════════════════════════════════════ */
.ml-wrap{max-width:1280px;margin:0 auto;padding:8px 4px;}
.ml-head{margin-bottom:18px;}
.ml-head p{font-size:13px;line-height:1.8;color:var(--text-secondary);margin:8px 0 0;}
.ml-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));}
.ml-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px;box-shadow:var(--shadow-sm);transition:box-shadow .25s ease,border-color .2s ease,transform .2s cubic-bezier(.34,1.56,.64,1);}
.ml-card:hover{box-shadow:var(--shadow-md);border-color:var(--accent);transform:translateY(-2px);}
.ml-card h4{font-size:14px;font-weight:700;color:var(--text-primary);margin-bottom:4px;display:flex;align-items:center;gap:8px;}
.ml-card .ml-sub{font-size:12px;color:var(--text-muted);margin-bottom:12px;}
.ml-hint{position:absolute;bottom:6px;right:10px;font-size:11px;color:var(--text-muted);opacity:.7;}
.ml-demo{min-height:120px;display:flex;align-items:center;justify-content:center;gap:14px;padding:18px;border-radius:var(--radius);background:var(--bg-tertiary);margin-bottom:12px;position:relative;overflow:hidden;}
.ml-prompt{font-size:12px;line-height:1.7;color:var(--text-secondary);background:var(--bg-tertiary);border:1px dashed var(--border);border-radius:var(--radius);padding:10px 12px;white-space:pre-wrap;word-break:break-word;}
.ml-prompt b{color:var(--accent-text);}

/* ① 爆炸爱心 */
.ml-heart{font-size:40px;cursor:pointer;user-select:none;transition:transform .25s cubic-bezier(.34,1.56,.64,1);filter:drop-shadow(0 2px 6px rgba(230,57,124,.4));}
.ml-heart:active{transform:scale(.82);}
.ml-heart.pop{animation:ml-heart-pop .5s cubic-bezier(.34,1.56,.64,1);}
@keyframes ml-heart-pop{0%{transform:scale(1)}30%{transform:scale(1.35)}60%{transform:scale(.9)}100%{transform:scale(1)}}
.ml-particle{position:absolute;width:8px;height:8px;border-radius:50%;background:var(--accent);pointer-events:none;opacity:0;}
@keyframes ml-burst{0%{opacity:1;transform:translate(0,0) scale(1)}100%{opacity:0;transform:translate(var(--dx),var(--dy)) scale(.2)}}

/* ② 果冻开关 */
.ml-switch{position:relative;width:64px;height:34px;border-radius:999px;background:var(--border);cursor:pointer;transition:background .3s ease,transform .2s cubic-bezier(.34,1.56,.64,1);border:none;}
.ml-switch.on{background:var(--accent);}
.ml-switch:active{transform:scaleX(1.12) scaleY(.9);}
.ml-switch .ml-knob{position:absolute;top:3px;left:3px;width:28px;height:28px;border-radius:50%;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.25);transition:left .35s cubic-bezier(.34,1.8,.5,1);}
.ml-switch.on .ml-knob{left:33px;}

/* ③ 铃铛声波 */
.ml-bell{font-size:38px;cursor:pointer;user-select:none;transition:transform .3s ease;display:inline-block;position:relative;}
.ml-bell.shake{animation:ml-bell-shake .6s ease;}
@keyframes ml-bell-shake{0%,100%{transform:rotate(0)}15%{transform:rotate(14deg)}30%{transform:rotate(-12deg)}45%{transform:rotate(8deg)}60%{transform:rotate(-6deg)}75%{transform:rotate(3deg)}}
.ml-wave{position:absolute;left:50%;top:50%;width:14px;height:14px;border:2px solid var(--accent);border-radius:50%;transform:translate(-50%,-50%);opacity:0;pointer-events:none;}
.ml-wave.go{animation:ml-wave 1s ease-out;}
@keyframes ml-wave{0%{opacity:.7;width:14px;height:14px}100%{opacity:0;width:90px;height:90px}}
.ml-badge{position:absolute;top:-4px;right:-4px;min-width:18px;height:18px;padding:0 4px;border-radius:999px;background:var(--danger);color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;transform:scale(0);transition:transform .3s cubic-bezier(.34,1.56,.64,1);}
.ml-badge.show{transform:scale(1);}

/* ④ 图标变形下载 */
.ml-dl{position:relative;width:120px;height:42px;border-radius:var(--radius);background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:14px;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:8px;transition:width .3s ease;}
.ml-dl .ml-dl-label{transition:opacity .2s;}
.ml-dl .ml-ring{width:20px;height:20px;border:3px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:ml-spin .7s linear infinite;display:none;}
.ml-dl.loading .ml-ring{display:block;}
.ml-dl.loading .ml-arrow{display:none;}
.ml-dl.done{background:var(--success);}
.ml-dl .ml-check{display:none;font-weight:700;}
.ml-dl.done .ml-check{display:inline;}
.ml-dl.done .ml-ring{display:none;}
@keyframes ml-spin{to{transform:rotate(360deg)}}
.ml-arrow{font-size:16px;}

/* ⑤ 摇晃碎裂删除 */
.ml-trash-wrap{position:relative;display:inline-block;}
.ml-trash{font-size:40px;cursor:pointer;user-select:none;transition:opacity .4s,transform .4s;}
.ml-trash.shake{animation:ml-shake .5s ease;}
@keyframes ml-shake{0%,100%{transform:rotate(0) translateX(0)}20%{transform:rotate(-10deg) translateX(-4px)}40%{transform:rotate(8deg) translateX(4px)}60%{transform:rotate(-6deg) translateX(-3px)}80%{transform:rotate(4deg) translateX(2px)}}
.ml-shard{position:absolute;width:7px;height:7px;background:var(--text-muted);border-radius:2px;opacity:0;pointer-events:none;}
@keyframes ml-fall{0%{opacity:1;transform:translate(0,0) rotate(0)}100%{opacity:0;transform:translate(var(--sx),120px) rotate(var(--sr))}}

/* ⑥ 水波按钮 */
.ml-ripple-btn{position:relative;overflow:hidden;padding:10px 22px;border-radius:var(--radius);background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:14px;font-family:var(--font-sans);}
.ml-ripple{position:absolute;border-radius:50%;background:rgba(255,255,255,.5);transform:translate(-50%,-50%) scale(0);pointer-events:none;animation:ml-ripple .6s ease-out;}
@keyframes ml-ripple{to{transform:translate(-50%,-50%) scale(8);opacity:0}}

/* ⑦ 汉堡变叉 */
.ml-burger{width:44px;height:34px;background:transparent;border:none;cursor:pointer;position:relative;padding:0;}
.ml-burger span{position:absolute;left:7px;right:7px;height:3px;border-radius:3px;background:var(--text-primary);transition:transform .3s cubic-bezier(.34,1.56,.64,1),opacity .2s;}
.ml-burger span:nth-child(1){top:8px;}
.ml-burger span:nth-child(2){top:15px;}
.ml-burger span:nth-child(3){top:22px;}
.ml-burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.ml-burger.open span:nth-child(2){opacity:0;}
.ml-burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ⑧ 底部抽屉 */
.ml-drawer{position:relative;width:100%;height:90px;border-radius:var(--radius);background:var(--bg-secondary);border:1px solid var(--border);overflow:hidden;}
.ml-drawer-panel{position:absolute;left:0;right:0;bottom:0;background:var(--bg-card);border-top:2px solid var(--accent);padding:14px;transform:translateY(100%);transition:transform .4s cubic-bezier(.34,1.56,.64,1);box-shadow:0 -8px 24px rgba(0,0,0,.18);}
.ml-drawer.open .ml-drawer-panel{transform:translateY(0);}
.ml-drawer-handle{position:absolute;left:50%;top:6px;transform:translateX(-50%);width:40px;height:4px;border-radius:2px;background:var(--border);}
.ml-drawer-trigger{position:absolute;left:12px;bottom:12px;padding:6px 14px;border-radius:var(--radius);background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:13px;z-index:2;}

/* ⑨ 卡片抽走 */
.ml-swipe-card{width:200px;padding:16px;border-radius:var(--radius);background:var(--bg-card);border:1px solid var(--border);box-shadow:var(--shadow-sm);transition:transform .5s cubic-bezier(.55,0,.55,.7),opacity .5s;cursor:pointer;font-size:13px;color:var(--text-secondary);}
.ml-swipe-card.gone{transform:translateX(320px) rotate(8deg);opacity:0;}

/* reset 按钮（实验室通用） */
.ml-reset{margin-top:10px;font-size:12px;padding:4px 12px;border-radius:var(--radius);background:var(--bg-hover);color:var(--accent-text);border:1px solid var(--border);cursor:pointer;}