*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:#5a3a1c;background:linear-gradient(180deg,#fff7e0,#ffe9b0 60%,#ffd56a);overflow-x:hidden;min-height:100vh}a{color:inherit;text-decoration:none}:root{--sun: #ffb84d;--sun-deep: #ff8a00;--leaf: #79b34d;--leaf-deep: #4f8a25;--brown: #7a4a1f;--cream: #fff7e0;--paper: #fffdf6;--shadow: 0 10px 30px rgba(122, 74, 31, .18)}.header{text-align:center;padding:48px 20px 24px;position:relative;z-index:2}.header-with-bg{padding-top:150px;padding-bottom:32px;min-height:260px;border-radius:0 0 32px 32px;box-shadow:0 12px 30px #7a4a1f2e;overflow:hidden;background-repeat:no-repeat;display:flex;flex-direction:column;justify-content:flex-end;align-items:center}.header-with-bg{background-image:linear-gradient(to top,#fff7e08c,#fff7e026 40%,#fff0 70%),var(--header-img, 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rotate(-14deg)}.hero-sun-right{right:6px;transform:translateY(-40%) rotate(12deg);animation-delay:1.2s}.hero-sub{display:inline-block;margin-top:22px;padding:9px 30px;font-size:15px;letter-spacing:2px;color:var(--brown);background:repeating-linear-gradient(45deg,#ffe58a 0,#ffe58a 10px,#ffd56a 10px,#ffd56a 20px);transform:rotate(1deg);clip-path:polygon(3% 6%,14% 0,50% 5%,88% 0,97% 8%,100% 42%,96% 92%,82% 100%,45% 94%,8% 100%,0 88%,4% 40%);filter:drop-shadow(0 6px 10px rgba(122,74,31,.2));animation:hero-pop .5s .45s cubic-bezier(.34,1.56,.64,1) both}@keyframes hero-drop{0%{opacity:0;transform:translateY(-36px) rotate(-6deg)}to{opacity:1;transform:translateY(0) rotate(-1.4deg)}}@keyframes hero-pop{0%{opacity:0;transform:scale(.7) rotate(var(--r, 0deg))}to{opacity:1}}.hero-title{--r: -2deg}.hero-sub{--r: 1deg}.box-page{max-width:980px;margin:0 auto;padding:0 24px 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ease-in-out infinite}.open-btn-spark{animation:open-spark 1.2s ease-in-out infinite}.open-btn-arrow{transition:transform .2s}.open-btn:hover .open-btn-arrow{transform:translate(3px)}.open-btn:active{transform:translateY(2px);box-shadow:0 2px 0 var(--brown)}@keyframes open-btn-pulse{0%,to{transform:translateY(0);box-shadow:0 4px 0 var(--brown),0 8px 18px #ff4d6d59}50%{transform:translateY(-3px);box-shadow:0 7px 0 var(--brown),0 14px 24px #ff4d6d73}}@keyframes open-spark{0%,to{transform:scale(1) rotate(0)}50%{transform:scale(1.3) rotate(20deg)}}.open-hint{margin-top:6px;font-size:10px;color:var(--sun-deep);font-weight:700;letter-spacing:.5px;animation:open-hint-bounce 1.4s ease-in-out infinite}@keyframes open-hint-bounce{0%,to{transform:translateY(0);opacity:.85}50%{transform:translateY(-4px);opacity:1}}.fake-icon{font-size:32px}.fake-hint{font-size:11px;line-height:1.4;color:#555}.box-progress{margin-top:24px;text-align:center;font-size:14px;color:var(--brown);display:flex;flex-direction:column;align-items:center;gap:10px}.progress-pill{position:fixed;top:14px;right:14px;z-index:20;display:inline-flex;align-items:center;gap:6px;padding:8px 14px 8px 12px;background:var(--paper);border:2px solid var(--sun);border-radius:999px;box-shadow:0 8px 18px #7a4a1f40;font-size:13px;color:var(--brown);font-weight:600;animation:pill-pop .3s cubic-bezier(.34,1.56,.64,1) both}.progress-pill-num{display:inline-block;min-width:22px;text-align:center;color:var(--sun-deep);font-size:16px;font-weight:900}.progress-pill-divider{color:var(--brown);opacity:.5}.progress-pill-total{font-size:12px;opacity:.7}.progress-pill-label{font-size:12px;opacity:.8;margin-right:4px}@keyframes pill-pop{0%{opacity:0;transform:translateY(-12px) scale(.8)}to{opacity:1;transform:translateY(0) scale(1)}}.global-back{position:fixed;top:14px;left:14px;z-index:30;padding:7px 16px 7px 13px;background:var(--paper);color:var(--brown);border:2px solid var(--sun);border-radius:999px;font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;box-shadow:0 6px 16px #7a4a1f38;transition:transform .15s}.global-back:hover{transform:translate(-2px)}.global-back:active{transform:scale(.96)}.family-entry{margin:32px auto 0;max-width:560px;background:var(--paper);border:3px solid var(--sun);border-radius:18px;padding:16px 20px;display:flex;align-items:center;gap:14px;cursor:pointer;box-shadow:var(--shadow);transition:transform .2s}.family-entry:hover{transform:translateY(-2px)}.family-entry:focus-visible{outline:3px solid var(--sun-deep);outline-offset:2px}.family-entry-icon{font-size:30px;flex-shrink:0}.family-entry-text{flex:1;min-width:0}.family-entry-title{font-size:15px;font-weight:700;color:var(--brown)}.family-entry-sub{font-size:12px;color:var(--leaf-deep);margin-top:2px}.family-entry-arrow{font-size:22px;color:var(--sun-deep)}.family-letter{max-width:640px;margin:40px auto 80px;padding:44px 36px 36px;background:var(--paper);border:3px solid var(--sun);border-radius:6px 24px;position:relative;z-index:2;box-shadow:var(--shadow);line-height:2}.letter-tape{position:absolute;top:-14px;left:50%;transform:translate(-50%) rotate(-2deg);padding:5px 22px;font-size:12px;letter-spacing:2px;color:var(--brown);background:repeating-linear-gradient(45deg,#ffe58a 0,#ffe58a 10px,#ffd56a 10px,#ffd56a 20px);clip-path:polygon(3% 6%,14% 0,50% 5%,88% 0,97% 8%,100% 42%,96% 92%,82% 100%,45% 94%,8% 100%,0 88%,4% 40%);filter:drop-shadow(0 4px 8px rgba(122,74,31,.25))}.letter-title{text-align:center;color:var(--sun-deep);font-size:24px;margin-bottom:22px}.letter-body p{font-size:15px;color:var(--brown);text-indent:2em;margin-bottom:14px}.letter-opening{text-indent:0!important;font-weight:700}.letter-sign{margin-top:24px;text-align:right}.letter-sign-line{font-size:15px;color:var(--brown);font-weight:700;margin-bottom:6px}.signature{color:var(--leaf-deep);font-style:italic;font-size:14px}.sunflower-deco{position:absolute;width:90px;height:90px;z-index:1;opacity:.85;pointer-events:none}.sunflower-deco.left{top:80px;left:-20px;--r: -15deg;transform:rotate(-15deg)}.sunflower-deco.right{top:140px;right:-10px;--r: 20deg;transform:rotate(20deg)}.confetti{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;pointer-events:none;z-index:5;overflow:hidden}.petal{position:absolute;width:18px;height:18px;background:#ff4d6d;transform:rotate(45deg);opacity:0;animation:heart-fall linear forwards;--drift: 0px}.petal:before,.petal:after{content:"";position:absolute;width:100%;height:100%;background:inherit;border-radius:50%}.petal:before{top:-50%;left:0}.petal:after{left:-50%;top:0}@keyframes heart-fall{0%{transform:rotate(45deg) translateY(0) translate(0) scale(.4);opacity:0}15%{opacity:1;transform:rotate(55deg) translateY(8vh) translate(0) scale(1)}to{transform:rotate(540deg) translateY(80vh) translate(var(--drift)) scale(.9);opacity:0}}@keyframes floaty{0%,to{transform:translateY(0) rotate(var(--r, 0deg))}50%{transform:translateY(-12px) rotate(var(--r, 0deg))}}.floaty{animation:floaty 6s ease-in-out infinite}.floaty.delay{animation-delay:1.5s}.teacher-page{max-width:720px;margin:40px auto;padding:32px;background:var(--paper);border:3px solid var(--sun);border-radius:24px;box-shadow:var(--shadow);position:relative;z-index:2}.teacher-page .top{display:flex;flex-direction:column;align-items:center;gap:12px;margin-bottom:18px;text-align:center}.teacher-avatar{width:140px;height:140px;border-radius:50%;object-fit:cover;border:5px solid #fff;box-shadow:0 6px 20px #7a4a1f4d}.teacher-page h2{color:var(--sun-deep);font-size:26px}.teacher-page .role{color:var(--leaf-deep);font-size:14px}.teacher-page .greeting{background:var(--cream);border-left:4px solid var(--sun);padding:14px 18px;border-radius:8px;margin:16px 0;line-height:1.8;color:var(--brown)}.audio-section{margin-top:12px;padding:18px 20px;background:var(--cream);border:2px solid var(--sun);border-radius:16px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}.audio-label{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:15px;font-weight:700;color:var(--brown)}.audio-kid-avatar{width:72px;height:72px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:0 3px 10px #7a4a1f40}.audio-player{width:100%;border-radius:999px;outline:none}.audio-player::-webkit-media-controls-panel{background:#fff}.dot{width:10px;height:10px;background:var(--sun-deep);border-radius:50%;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.3);opacity:.6}}.back-btn{display:inline-block;margin-top:20px;padding:8px 18px;background:var(--leaf);color:#fff;border-radius:999px;font-size:14px;cursor:pointer;border:none;font-family:inherit}.back-btn:hover{background:var(--leaf-deep)}footer{text-align:center;padding:20px;font-size:12px;color:var(--brown);opacity:.6}