@import"https://fonts.googleapis.com/css2?family=ZCOOL+KuaiLe&family=Noto+Sans+SC:wght@400;500;700;900&display=swap";:root{--red: #ff5a5f;--orange: #ff8a00;--yellow: #ffc93c;--yellow-soft: #ffb800;--green: #34c759;--green-soft: #4cd97b;--blue: #3b82f6;--blue-soft: #60a5fa;--purple: #8b5cf6;--purple-soft: #a78bfa;--pink: #ff7ac6;--navy: #2d2a3e;--ink: #3d3a50;--muted: #7b768f;--cream: #f7f9ff;--card-bg: #ffffff;--radius-lg: 28px;--radius-md: 20px;--shadow-soft: 0 10px 30px rgba(61, 58, 80, .08);--shadow-float: 0 16px 40px rgba(61, 58, 80, .14);--font-fun: "ZCOOL KuaiLe", "Noto Sans SC", sans-serif;--font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-body);color:var(--ink);background:var(--cream);line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}::selection{background:var(--yellow);color:var(--navy)}a{text-decoration:none;color:inherit}img,svg{display:block;max-width:100%}button{font-family:inherit;cursor:pointer}.container{width:min(1120px,92%);margin:0 auto}.container-narrow{width:min(820px,92%);margin:0 auto}section[id]{scroll-margin-top:88px}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 26px;border:none;border-radius:999px;font-size:1rem;font-weight:700;font-family:var(--font-body);transition:transform .2s ease,box-shadow .2s ease;white-space:nowrap}.btn-primary{background:linear-gradient(135deg,var(--blue-soft),var(--purple) 60%,var(--pink));color:#fff;box-shadow:0 8px 22px #7864ff61}.btn-primary:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 14px 30px #7864ff80}.btn-ghost{background:#fff;color:var(--ink);border:2px dashed var(--purple-soft);box-shadow:var(--shadow-soft)}.btn-ghost:hover{transform:translateY(-3px);border-color:var(--purple);color:var(--purple)}.btn-lg{padding:15px 32px;font-size:1.08rem}.site-header{position:sticky;top:0;z-index:100;background:#f7f9ffdb;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:2px solid rgba(167,139,250,.28)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}.logo{display:inline-flex;align-items:center;gap:10px}.logo-badge{position:relative;width:42px;height:42px;border-radius:50%;background:linear-gradient(160deg,var(--yellow) 10%,var(--orange) 90%);box-shadow:0 4px 12px #ffa02866;flex-shrink:0}.logo-ears{position:absolute;top:-2px;left:4px;width:12px;height:12px;border-radius:50%;background:var(--yellow-soft);box-shadow:22px 0 0 var(--yellow-soft)}.logo-face{position:absolute;top:9px;right:8px;bottom:6px;left:8px;border-radius:50%;background:radial-gradient(circle at 30% 38%,#33333b 0 3px,transparent 3.6px),radial-gradient(circle at 70% 38%,#33333b 0 3px,transparent 3.6px),radial-gradient(circle at 50% 62%,transparent 0 5px,#ff7ac6 5px 6px,transparent 6.4px)}.logo-text{font-family:var(--font-fun);font-size:1.45rem;color:var(--navy);letter-spacing:1px;line-height:1.1}.logo-text em{font-style:normal;color:var(--purple);font-size:1.05rem;margin-left:2px}.nav{display:flex;align-items:center;gap:4px}.nav a{padding:8px 14px;border-radius:999px;font-size:.95rem;font-weight:500;color:var(--ink);transition:background .2s,color .2s}.nav a:hover{background:#fff;color:var(--purple);box-shadow:var(--shadow-soft)}.header-cta{padding:10px 22px;font-size:.95rem}.hero{position:relative;min-height:92vh;display:flex;align-items:center;background:linear-gradient(180deg,#eaf1ff,#f3ecff 55%,#fff);overflow:hidden;padding:60px 0 90px}.hero-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.math-grid{position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(rgba(139,92,246,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(139,92,246,.06) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 78%);-webkit-mask-image:radial-gradient(ellipse at 50% 40%,#000 30%,transparent 78%)}.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5}.blob-1{width:420px;height:420px;background:#ffd84d;top:-120px;left:-100px;animation:drift 12s ease-in-out infinite alternate}.blob-2{width:380px;height:380px;background:#b7a4ff;bottom:-80px;right:-60px;animation:drift 14s ease-in-out infinite alternate-reverse}.blob-3{width:300px;height:300px;background:#9bd8ff;top:10%;right:28%;animation:drift 16s ease-in-out infinite alternate}@keyframes drift{0%{transform:translate(0) scale(1)}to{transform:translate(30px,-24px) scale(1.08)}}.dotted-ring{position:absolute;border:3px dashed rgba(139,92,246,.35);border-radius:50%;animation:spin 30s linear infinite}.ring-1{width:130px;height:130px;left:6%;top:16%}.ring-2{width:90px;height:90px;right:8%;bottom:14%;border-color:#ff5a5f59;animation-direction:reverse}@keyframes spin{to{transform:rotate(360deg)}}.star{position:absolute;font-size:1.6rem;color:var(--yellow-soft);animation:twinkle 2.4s ease-in-out infinite}.star-1{left:14%;bottom:22%}.star-2{right:18%;top:18%;color:var(--pink);animation-delay:.8s}.star-3{left:44%;bottom:12%;color:var(--purple-soft);animation-delay:1.4s}@keyframes twinkle{0%,to{transform:scale(1) rotate(0);opacity:1}50%{transform:scale(1.35) rotate(20deg);opacity:.55}}.math-sym{position:absolute;font-family:Georgia,serif;font-weight:900;color:var(--purple-soft);opacity:.4;animation:sym-float 6s ease-in-out infinite}.sym-1{left:7%;top:30%;font-size:2.2rem}.sym-2{left:12%;top:62%;font-size:1.7rem;color:var(--orange);animation-delay:1s}.sym-3{right:9%;top:26%;font-size:2rem;color:var(--red);animation-delay:.6s}.sym-4{right:14%;top:60%;font-size:1.8rem;animation-delay:1.8s}.sym-5{left:46%;top:12%;font-size:1.6rem;color:var(--green);animation-delay:2.4s}.sym-6{right:38%;bottom:9%;font-size:2rem;color:var(--pink);animation-delay:3s}.sym-7{left:30%;bottom:7%;font-size:1.5rem;animation-delay:3.6s}.sym-8{right:30%;top:14%;font-size:1.5rem;color:var(--yellow-soft);animation-delay:4.2s}@keyframes sym-float{0%,to{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-16px) rotate(6deg)}}.hero-inner{position:relative;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:44px}.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:2px solid var(--purple-soft);border-radius:999px;padding:7px 16px;font-size:.92rem;font-weight:700;color:var(--purple);box-shadow:var(--shadow-soft)}.badge-dot{width:10px;height:10px;border-radius:50%;background:var(--green-soft);box-shadow:0 0 0 4px #4cd97b40;animation:pulse 1.6s ease-in-out infinite}@keyframes pulse{50%{box-shadow:0 0 0 8px #4cd97b14}}.hero-title{font-family:var(--font-fun);font-size:clamp(2.6rem,6vw,4.2rem);line-height:1.14;margin:18px 0 10px;color:var(--navy);background:linear-gradient(120deg,var(--blue),var(--purple) 45%,var(--red) 90%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.hero-subtitle-line{display:block;font-family:var(--font-body);font-size:clamp(1.3rem,3vw,1.9rem);font-weight:900;color:var(--navy);-webkit-text-fill-color:var(--navy);margin-top:6px}.hero-subtitle-line:after{content:"";display:inline-block;width:12px;height:12px;margin-left:6px;border-radius:3px;background:var(--purple);transform:rotate(45deg);animation:bounce-dot 1s ease-in-out infinite;vertical-align:middle}@keyframes bounce-dot{50%{transform:translateY(-6px) rotate(45deg)}}.hero-desc{max-width:520px;color:var(--muted);font-size:1.06rem;margin:14px 0 26px}.hero-actions{display:flex;flex-wrap:wrap;gap:14px}.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:34px;max-width:540px}.stat-card{background:#fff;border-radius:18px;padding:14px 10px;text-align:center;box-shadow:var(--shadow-soft);border-bottom:5px solid transparent;transition:transform .2s ease}.stat-card:hover{transform:translateY(-4px)}.stat-card strong{display:block;font-family:var(--font-fun);font-size:1.35rem;line-height:1.2;color:var(--ink)}.stat-card span{font-size:.82rem;color:var(--muted)}.stat-orange{border-bottom-color:var(--orange)}.stat-orange strong{color:var(--orange)}.stat-blue{border-bottom-color:var(--blue)}.stat-blue strong{color:var(--blue)}.stat-green{border-bottom-color:var(--green)}.stat-green strong{color:var(--green)}.stat-pink{border-bottom-color:var(--pink)}.stat-pink strong{color:var(--pink)}.hero-art{position:relative;display:flex;justify-content:center;align-items:center;min-height:420px}.mascot-wrap{position:relative;width:min(420px,100%);animation:bob 4.5s ease-in-out infinite}@keyframes bob{0%,to{transform:translateY(0) rotate(-1.5deg)}50%{transform:translateY(-16px) rotate(1.5deg)}}.mascot{width:100%;filter:drop-shadow(0 18px 26px rgba(100,90,255,.26))}.mascot-bit{animation:bit-float 3.4s ease-in-out infinite}.mascot-bit-2{animation-delay:.8s}.mascot-bit-3{animation-delay:1.6s}@keyframes bit-float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.mascot-shadow{position:absolute;left:50%;bottom:-4px;width:62%;height:22px;transform:translate(-50%);background:#645aff29;border-radius:50%;filter:blur(8px);animation:shadow-pulse 4.5s ease-in-out infinite}@keyframes shadow-pulse{50%{transform:translate(-50%) scaleX(.82);opacity:.7}}.float-chip{position:absolute;background:#fff;border-radius:999px;padding:9px 16px;font-size:.92rem;font-weight:700;color:var(--ink);box-shadow:var(--shadow-float);border:2px solid rgba(255,255,255,.9);white-space:nowrap;animation:chip-float 3.6s ease-in-out infinite}.chip-score{top:6%;left:-2%;border-color:var(--purple-soft);color:var(--purple)}.chip-streak{top:42%;right:-4%;border-color:var(--red);color:var(--red);animation-delay:.9s}.chip-star{bottom:6%;left:4%;border-color:var(--yellow-soft);color:var(--orange);animation-delay:1.8s}@keyframes chip-float{0%,to{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-12px) rotate(2deg)}}.note{position:absolute;font-family:Georgia,serif;font-size:2rem;font-weight:700;opacity:.85;animation:note-float 3s ease-in-out infinite}.note-1{top:10%;right:12%;color:var(--purple-soft)}.note-2{top:30%;left:-3%;color:var(--red);font-size:2.4rem;animation-delay:1s}.note-3{bottom:18%;right:2%;color:var(--blue-soft);animation-delay:.5s}.note-4{bottom:-2%;left:30%;color:var(--pink);font-size:1.6rem;animation-delay:1.5s}@keyframes note-float{0%,to{transform:translateY(0) rotate(-8deg)}50%{transform:translateY(-18px) rotate(8deg)}}.hero-wave{position:absolute;left:0;right:0;bottom:-1px;line-height:0}.hero-wave svg{width:100%;height:70px}.section{padding:86px 0;position:relative}.section-tint{background:linear-gradient(180deg,#e8f0ff 0%,#f2ecff 60%,var(--cream) 100%)}.section-kicker{text-align:center;font-weight:900;color:var(--purple);font-size:1rem;letter-spacing:2px;margin-bottom:10px}.section-title{text-align:center;font-family:var(--font-fun);font-size:clamp(1.9rem,4vw,2.7rem);color:var(--navy);line-height:1.3}.section-sub{text-align:center;color:var(--muted);max-width:640px;margin:14px auto 0}.grad-text{background:linear-gradient(120deg,var(--purple),var(--pink) 55%,var(--red));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.doka-word{color:var(--red)}.playground-grid{display:grid;grid-template-columns:1.45fr 1fr;gap:30px;align-items:stretch;margin-top:48px}.canvas-card{position:relative;border-radius:var(--radius-lg);overflow:hidden;background:radial-gradient(circle at 50% 30%,#fff,#e9e3ff 55%,#cfc2ff);border:4px solid #fff;box-shadow:var(--shadow-float);min-height:460px}.canvas-card canvas{touch-action:none}.canvas-hint{position:absolute;left:50%;bottom:14px;transform:translate(-50%);background:#2d2a3ed1;color:#fff;border-radius:999px;padding:7px 18px;font-size:.85rem;font-weight:700;white-space:nowrap;pointer-events:none;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.canvas-fallback{height:100%;min-height:460px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;text-align:center;padding:30px;color:var(--muted);font-weight:700}.fallback-emoji{font-size:3.4rem;animation:bob 2.5s ease-in-out infinite}.shape-tag{display:inline-block;white-space:nowrap;background:#ffffffeb;color:var(--navy);font-weight:900;font-size:.85rem;padding:4px 12px;border-radius:999px;border:2.5px solid var(--tag-color, var(--purple-soft));box-shadow:0 4px 12px #2d2a3e2e;-webkit-user-select:none;user-select:none;pointer-events:none}.tag-0{--tag-color: #3b82f6}.tag-1{--tag-color: #ff5a5f}.tag-2{--tag-color: #ffb800}.tag-3{--tag-color: #34c759}.tag-4{--tag-color: #a78bfa}.tag-5{--tag-color: #ff7ac6}.playground-info{background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);padding:34px 32px;border:3px solid var(--purple-soft);display:flex;flex-direction:column}.playground-info h3{font-family:var(--font-fun);font-size:1.5rem;color:var(--navy);line-height:1.4}.info-desc{color:var(--muted);font-size:.96rem;margin:12px 0 20px}.legend-list{list-style:none;display:flex;flex-direction:column;gap:10px;flex:1}.legend-list li{display:flex;align-items:center;gap:12px;background:var(--cream);border-radius:14px;padding:10px 14px;font-size:.92rem}.legend-dot{width:18px;height:18px;border-radius:6px;flex-shrink:0;box-shadow:inset 0 0 0 2px #ffffffb3,0 2px 5px #2d2a3e33}.legend-name{font-weight:900;color:var(--navy)}.legend-fact{color:var(--muted);font-size:.82rem}.info-note{margin-top:18px;font-size:.9rem;color:var(--muted);background:linear-gradient(135deg,#f3ecff,#ffeef6);border-radius:14px;padding:12px 16px}.info-note strong{color:var(--purple)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}.feature-card{position:relative;background:var(--card-bg);border-radius:var(--radius-lg);padding:30px 26px 26px;box-shadow:var(--shadow-soft);overflow:hidden;transition:transform .25s ease,box-shadow .25s ease}.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-float)}.feature-card:before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:var(--card-accent, var(--purple))}.card-blue{--card-accent: var(--blue)}.card-red{--card-accent: var(--red)}.card-orange{--card-accent: var(--orange)}.card-green{--card-accent: var(--green)}.card-purple{--card-accent: var(--purple)}.card-pink{--card-accent: var(--pink)}.feature-emoji{width:64px;height:64px;display:grid;place-items:center;font-size:2rem;border-radius:22px;background:color-mix(in srgb,var(--card-accent) 16%,#fff);margin-bottom:16px;transition:transform .25s ease}.feature-card:hover .feature-emoji{transform:scale(1.12) rotate(-6deg)}.feature-card h3{font-family:var(--font-fun);font-size:1.3rem;color:var(--navy);margin-bottom:8px}.feature-card p{color:var(--muted);font-size:.96rem}.feature-line{position:absolute;right:22px;bottom:18px;width:46px;height:8px;border-radius:999px;background:color-mix(in srgb,var(--card-accent) 55%,#fff)}.grade-tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:40px}.grade-tab{display:inline-flex;align-items:center;gap:8px;border:2px solid transparent;border-radius:999px;padding:10px 20px;font-size:1rem;font-weight:900;background:#fff;color:var(--ink);box-shadow:var(--shadow-soft);transition:transform .2s ease,box-shadow .2s ease,background .2s ease}.grade-tab:hover{transform:translateY(-3px)}.grade-tab.active{color:#fff;transform:translateY(-3px) scale(1.05);box-shadow:0 12px 26px #3d3a5033}.tab-emoji{font-size:1.15rem}.tab-green.active{background:linear-gradient(135deg,#4cd97b,#1fae52)}.tab-blue.active{background:linear-gradient(135deg,#60a5fa,var(--blue))}.tab-orange.active{background:linear-gradient(135deg,var(--yellow-soft),var(--orange))}.tab-purple.active{background:linear-gradient(135deg,var(--purple-soft),var(--purple))}.tab-pink.active{background:linear-gradient(135deg,var(--pink),#f0458f)}.tab-red.active{background:linear-gradient(135deg,#ff8a80,var(--red))}.grade-panel{margin-top:28px;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);padding:34px 38px;border:3px solid var(--purple-soft);animation:panel-pop .35s ease}@keyframes panel-pop{0%{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}.grade-panel-head{display:flex;align-items:center;gap:18px}.grade-badge{width:68px;height:68px;display:grid;place-items:center;font-size:2rem;border-radius:50%;background:linear-gradient(160deg,#eef2ff,#ffe9f3);box-shadow:inset 0 0 0 3px #fff,var(--shadow-soft);flex-shrink:0}.grade-panel-head h3{font-family:var(--font-fun);font-size:1.5rem;color:var(--navy)}.grade-panel-head p{color:var(--purple);font-weight:700}.grade-points{list-style:none;margin-top:22px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.grade-points li{display:flex;align-items:flex-start;gap:10px;background:var(--cream);border-radius:16px;padding:14px 16px;font-size:.95rem;font-weight:500;color:var(--ink)}.check-dot{flex-shrink:0;width:22px;height:22px;display:grid;place-items:center;border-radius:50%;background:var(--green);color:#fff;font-size:.75rem;font-weight:900;margin-top:3px}.journey-list{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:52px}.journey-step{position:relative;background:#fff;border-radius:var(--radius-md);padding:26px 18px 24px;text-align:center;box-shadow:var(--shadow-soft);border-top:6px solid var(--step-accent, var(--yellow));transition:transform .22s ease}.journey-step:hover{transform:translateY(-6px)}.journey-step:not(:last-child):after{content:"➜";position:absolute;top:20px;right:-19px;color:var(--purple-soft);font-size:1.15rem;z-index:2}.step-sunny{--step-accent: var(--yellow-soft)}.step-sky{--step-accent: var(--blue)}.step-mint{--step-accent: var(--green-soft)}.step-grape{--step-accent: var(--purple)}.step-berry{--step-accent: var(--pink)}.journey-badge{position:absolute;top:-16px;left:50%;transform:translate(-50%);width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:var(--step-accent, var(--yellow));color:#fff;font-weight:900;font-size:1rem;box-shadow:0 4px 10px #3d3a5033}.journey-emoji{font-size:2.4rem;display:block;margin-bottom:10px}.journey-step h3{font-family:var(--font-fun);font-size:1.15rem;color:var(--navy);margin-bottom:6px}.journey-step p{font-size:.88rem;color:var(--muted)}.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:48px}.why-card{border-radius:var(--radius-md);padding:28px 22px;border:3px solid transparent;background:#fff;box-shadow:var(--shadow-soft);transition:transform .22s ease,border-color .22s ease}.why-card:hover{transform:translateY(-6px) rotate(-.5deg)}.why-blue{border-top-color:var(--blue)}.why-green{border-top-color:var(--green)}.why-orange{border-top-color:var(--orange)}.why-pink{border-top-color:var(--pink)}.why-emoji{display:grid;place-items:center;width:58px;height:58px;border-radius:20px;font-size:1.8rem;margin-bottom:14px;background:var(--cream)}.why-card h3{font-family:var(--font-fun);font-size:1.2rem;color:var(--navy);margin-bottom:8px}.why-card p{font-size:.92rem;color:var(--muted)}.why-quote{margin:48px auto 0;max-width:720px;background:#fff;border-radius:var(--radius-lg);padding:34px 40px;text-align:center;box-shadow:var(--shadow-soft);border:3px dashed var(--purple-soft);position:relative}.quote-avatar{width:56px;height:56px;margin:0 auto 12px;border-radius:50%;display:grid;place-items:center;font-size:1.7rem;background:linear-gradient(160deg,#eef2ff,#fff);box-shadow:var(--shadow-soft)}.why-quote blockquote{font-size:1.12rem;font-weight:700;color:var(--navy)}.quote-from{margin-top:10px;color:var(--muted);font-size:.9rem}.download-section{padding:88px 0;background:radial-gradient(circle at 10% 20%,rgba(167,139,250,.22),transparent 42%),radial-gradient(circle at 90% 80%,rgba(255,216,77,.22),transparent 42%),linear-gradient(180deg,var(--cream),#fff)}.download-card{position:relative;overflow:hidden;border-radius:40px;padding:60px 56px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:48px;color:#fff;background:linear-gradient(135deg,var(--blue-soft) 0%,var(--purple) 45%,var(--pink) 100%);box-shadow:0 24px 60px #6e5af059}.download-deco{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;opacity:.5}.download-deco span{position:absolute;font-size:2.2rem;font-weight:700;animation:note-float 4s ease-in-out infinite}.download-deco span:nth-child(1){top:14%;left:6%;animation-delay:0s}.download-deco 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