:root{--bg-primary: #f5ebe0;--bg-secondary: #e8d5c4;--bg-card: #fdfbf7;--text-primary: #5c4033;--text-secondary: #8b7355;--text-light: #a89880;--accent-heart: #e07a5f;--accent-heart-light: #f2a794;--accent-heart-dark: #c45d4a;--accent-warm: #d4a574;--shadow-soft: rgba(92, 64, 51, .1);--shadow-medium: rgba(92, 64, 51, .15);--font-display: "Ma Shan Zheng", cursive;--font-body: "ZCOOL XiaoWei", serif}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}#app{width:100%;height:100%;position:relative;overflow:hidden}.screen{position:absolute;top:0;left:0;width:100%;height:100%;opacity:0;visibility:hidden;transition:opacity .8s ease,visibility .8s ease}.screen.active{opacity:1;visibility:visible}#lock-screen{background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%);display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}#falling-hearts-container{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;overflow:hidden}.falling-heart{position:absolute;top:-50px;font-size:20px;animation:fall linear forwards;opacity:.7}@keyframes fall{0%{transform:translateY(0) rotate(0);opacity:.7}to{transform:translateY(calc(100vh + 100px)) rotate(360deg);opacity:.3}}.lock-content{display:flex;flex-direction:column;align-items:center;gap:40px;z-index:10}#pixel-heart{--pixel-size: 12px;--heart-color: var(--accent-heart);display:grid;grid-template-columns:repeat(13,var(--pixel-size));grid-template-rows:repeat(12,var(--pixel-size));animation:heartbeat 1.5s ease-in-out infinite;filter:drop-shadow(0 8px 24px rgba(224,122,95,.4))}@media (min-width: 400px){#pixel-heart{--pixel-size: 16px}}@keyframes heartbeat{0%,to{transform:scale(1)}15%{transform:scale(1.1)}30%{transform:scale(1)}45%{transform:scale(1.08)}60%{transform:scale(1)}}.pixel{width:var(--pixel-size);height:var(--pixel-size);background-color:var(--heart-color);border-radius:2px}.pixel.empty{background-color:transparent}.pixel.light{background-color:var(--accent-heart-light)}.pixel.dark{background-color:var(--accent-heart-dark)}#keyhole-container{display:flex;flex-direction:column;align-items:center;gap:20px}.keyhole{position:relative;width:36px;height:56px;display:flex;flex-direction:column;align-items:center}.keyhole-circle{width:36px;height:36px;background:linear-gradient(145deg,#5c4033,#3d2a22);border-radius:50%;box-shadow:inset 0 4px 8px #0006,0 2px 4px #0003}.keyhole-body{width:16px;height:28px;background:linear-gradient(145deg,#5c4033,#3d2a22);margin-top:-8px;clip-path:polygon(0 0,100% 0,85% 100%,15% 100%);box-shadow:inset 0 2px 4px #0000004d}#password-input{width:200px;padding:14px 20px;border:2px solid var(--accent-warm);border-radius:25px;background:#ffffffe6;font-family:var(--font-body);font-size:16px;text-align:center;color:var(--text-primary);outline:none;transition:all .3s ease}#password-input::placeholder{color:var(--text-light)}#password-input:focus{border-color:var(--accent-heart);box-shadow:0 0 20px #e07a5f4d}#password-input.shake{animation:shake .5s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-10px)}40%{transform:translate(10px)}60%{transform:translate(-10px)}80%{transform:translate(10px)}}#error-message{height:24px;font-size:14px;color:var(--accent-heart);opacity:0;transition:opacity .3s ease}#error-message.show{opacity:1}#main-content{background:var(--bg-primary);display:flex}#timeline{position:fixed;left:0;top:0;width:90px;height:100%;background:linear-gradient(to right,var(--bg-secondary) 70%,transparent);z-index:100;overflow-y:auto;overflow-x:hidden;scrollbar-width:none;-webkit-overflow-scrolling:touch}#timeline::-webkit-scrollbar{display:none}.timeline-inner{position:relative;min-height:100%;display:flex;flex-direction:column;align-items:center;padding:50px 0 60px}.timeline-line{position:absolute;left:50%;top:55px;bottom:55px;width:2px;background:var(--accent-warm);transform:translate(-50%)}.timeline-line:before{content:"💘";position:absolute;top:-24px;left:50%;transform:translate(-50%);font-size:20px;filter:drop-shadow(0 2px 4px rgba(0,0,0,.15))}.arrow-feather{position:absolute;bottom:-24px;left:50%;transform:translate(-50%);width:24px;height:24px}.arrow-feather:before{content:"";position:absolute;bottom:4px;right:50%;width:12px;height:4px;background:var(--accent-warm);transform-origin:right center;transform:rotate(35deg);border-radius:2px 0 0 2px}.arrow-feather:after{content:"";position:absolute;bottom:4px;left:50%;width:12px;height:4px;background:var(--accent-warm);transform-origin:left center;transform:rotate(-35deg);border-radius:0 2px 2px 0}.timeline-node{position:relative;width:24px;height:22px;cursor:pointer;transition:transform .3s ease;z-index:1;flex-shrink:0}.timeline-node:hover{transform:scale(1.2)}.timeline-node.active .node-heart{fill:var(--accent-heart);filter:drop-shadow(0 2px 6px rgba(224,122,95,.5))}.timeline-node .node-heart{fill:var(--text-light);transition:fill .3s ease,filter .3s ease}.timeline-date{position:absolute;left:32px;top:50%;transform:translateY(-50%);font-size:10px;color:var(--text-light);white-space:nowrap;opacity:0;transition:opacity .3s ease,color .3s ease;pointer-events:none}.timeline-node.visited .timeline-date{opacity:.7}.timeline-node.active .timeline-date{opacity:1;color:var(--accent-heart);font-weight:700}.timeline-node:hover .timeline-date{opacity:1}.timeline-nodes{display:flex;flex-direction:column;align-items:center;gap:24px;padding:40px 0;position:relative;z-index:2}#cards-container{flex:1;margin-left:90px;height:100%;position:relative;overflow:hidden;perspective:1000px}.card{position:absolute;top:0;left:0;width:100%;height:100%;padding:30px 20px;display:flex;flex-direction:column;will-change:transform,opacity;transform-origin:center center}.card.with-transition{transition:transform .4s cubic-bezier(.34,1.56,.64,1),opacity .4s ease}.card.dragging{transition:none!important}.card.stacked{transform:scale(.92) translateY(30px);opacity:.6;pointer-events:none;z-index:1}.card.stacked-deep{transform:scale(.85) translateY(50px);opacity:.3;pointer-events:none;z-index:0}.card.active{transform:scale(1) translateY(0) rotate(0);opacity:1;z-index:10;pointer-events:auto}.card.fly-out-up{transform:translateY(-150%) rotate(-8deg) scale(.9);opacity:0;z-index:20;pointer-events:none}.card.fly-out-down{transform:translateY(150%) rotate(8deg) scale(.9);opacity:0;z-index:20;pointer-events:none}.card.passed{transform:translateY(-100%) scale(.8);opacity:0;pointer-events:none;z-index:0}.card.behind{transform:translateY(100%) scale(.8);opacity:0;pointer-events:none;z-index:0}.card-inner{background:var(--bg-card);border-radius:20px;padding:30px 24px;box-shadow:0 4px 20px var(--shadow-soft),0 8px 40px var(--shadow-medium);flex:1;display:flex;flex-direction:column;overflow-y:auto;max-height:calc(100vh - 60px);-webkit-overflow-scrolling:touch}.card-inner::-webkit-scrollbar{width:4px}.card-inner::-webkit-scrollbar-track{background:transparent}.card-inner::-webkit-scrollbar-thumb{background:var(--accent-warm);border-radius:2px}.swipe-hint{position:absolute;bottom:20px;left:50%;transform:translate(-50%);display:flex;flex-direction:column;align-items:center;gap:4px;color:var(--text-light);font-size:12px;opacity:.6;animation:bounce-hint 2s ease-in-out infinite;pointer-events:none}.swipe-hint svg{width:20px;height:20px}@keyframes bounce-hint{0%,to{transform:translate(-50%) translateY(0)}50%{transform:translate(-50%) translateY(5px)}}.card-header{margin-bottom:24px;padding-bottom:16px;border-bottom:1px solid var(--bg-secondary)}.card-date{font-size:14px;color:var(--text-light);margin-bottom:8px}.card-title{font-family:var(--font-display);font-size:28px;color:var(--accent-heart);line-height:1.4}.card-content{flex:1;font-size:17px;line-height:2;color:var(--text-primary);letter-spacing:.5px}.card-content p{margin-bottom:16px}.char{opacity:0;display:inline;transition:opacity .4s ease}.char.visible{opacity:1}.card.animated .char{opacity:1;transition:none}.card-image{margin:16px 0;opacity:0;transform:translateY(10px);transition:opacity .6s ease,transform .6s ease}.card-image.visible{opacity:1;transform:translateY(0)}.card.animated .card-image{opacity:1;transform:translateY(0);transition:none}.card-image img{width:100%;border-radius:12px;box-shadow:0 4px 16px var(--shadow-soft);object-fit:cover;display:block}#bouncing-hearts-container{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1000;overflow:hidden}.bouncing-heart{position:absolute;font-size:24px;will-change:transform;transition:opacity .3s ease}.bouncing-heart.fade-out{opacity:0}@media (min-width: 768px){#timeline{width:110px}#cards-container{margin-left:110px}.card{padding:40px;display:flex;align-items:center;justify-content:center}.card-inner{padding:40px;max-width:600px;width:100%;max-height:calc(100vh - 120px)}.card-title{font-size:32px}.card-content{font-size:18px}.swipe-hint{bottom:30px}}#music-player{position:fixed;top:20px;right:20px;z-index:1000}.music-btn{width:48px;height:48px;border:none;border-radius:50%;background:var(--bg-card);box-shadow:0 2px 12px var(--shadow-medium);cursor:pointer;display:flex;align-items:center;justify-content:center;position:relative;transition:transform .2s ease,box-shadow .2s ease;overflow:visible}.music-btn:hover{box-shadow:0 4px 16px var(--shadow-medium)}.music-btn:active{transform:scale(.95)}.music-note{width:26px;height:26px;color:var(--accent-heart);animation:bounce-note .6s ease-in-out infinite}.music-note svg{width:100%;height:100%}@keyframes bounce-note{0%,to{transform:translateY(0) rotate(-5deg)}50%{transform:translateY(-4px) rotate(5deg)}}.music-note-off{width:26px;height:26px;color:var(--text-light);position:relative;display:none}.music-note-off svg{width:100%;height:100%}.music-note-off .slash{position:absolute;top:50%;left:50%;width:32px;height:3px;background:var(--accent-heart);border-radius:2px;transform:translate(-50%,-50%) rotate(-45deg)}.music-btn.playing .music-note{display:block}.music-btn.playing .music-note-off,.music-btn.paused .music-note{display:none}.music-btn.paused .music-note-off{display:block}.timeline-node{position:relative}.timeline-hearts-container{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:60px;height:60px;pointer-events:none;overflow:visible}.timeline-floating-heart{position:absolute;left:50%;top:50%;font-size:10px;opacity:0;animation:float-up 2.5s ease-out forwards;pointer-events:none}@keyframes float-up{0%{transform:translate(-50%,-50%) scale(.5);opacity:0}20%{opacity:1}to{transform:translate(calc(-50% + var(--drift-x, 0px)),calc(-50% - 40px)) scale(.3);opacity:0}}.timeline-node.active .node-heart{animation:glow-pulse 2s ease-in-out infinite}@keyframes glow-pulse{0%,to{filter:drop-shadow(0 0 4px rgba(224,122,95,.5))}50%{filter:drop-shadow(0 0 12px rgba(224,122,95,.8))}}