@import"https://fonts.googleapis.com/css2?family=Fredoka:wght@300;400;500;600;700&family=Baloo+2:wght@400;500;600;700;800&display=swap";:root{--color-primary: #FF6B6B;--color-primary-light: #FF8E8E;--color-primary-dark: #E55555;--color-secondary: #4ECDC4;--color-secondary-light: #7EDDD6;--color-secondary-dark: #3DBDB5;--color-accent: #FFE66D;--color-accent-light: #FFF0A3;--color-accent-dark: #E6CF5C;--color-purple: #A06CD5;--color-purple-light: #C4A0E8;--color-purple-dark: #8B5DC0;--color-orange: #FF9F43;--color-orange-light: #FFB976;--color-orange-dark: #E88D3A;--bg-main: #FFF9F0;--bg-card: #FFFFFF;--bg-gradient: linear-gradient(135deg, #FFF9F0 0%, #FFE8D6 100%);--text-primary: #2D3436;--text-secondary: #636E72;--text-light: #B2BEC3;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .08);--shadow-md: 0 4px 16px rgba(0, 0, 0, .12);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .16);--shadow-glow: 0 0 20px rgba(255, 107, 107, .4);--radius-sm: 12px;--radius-md: 20px;--radius-lg: 28px;--radius-xl: 40px;--radius-full: 9999px;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--font-display: "Fredoka", sans-serif;--font-body: "Baloo 2", cursive;--transition-fast: .15s ease;--transition-normal: .3s ease;--transition-slow: .5s ease;--transition-bounce: .5s cubic-bezier(.68, -.55, .265, 1.55)}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg-gradient);color:var(--text-primary);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:600;line-height:1.2}button{font-family:var(--font-display);cursor:pointer;border:none;outline:none}a{text-decoration:none;color:inherit}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-lg)}.text-center{text-align:center}.flex-center{display:flex;align-items:center;justify-content:center}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-main)}::-webkit-scrollbar-thumb{background:var(--color-primary-light);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}::selection{background:var(--color-accent);color:var(--text-primary)}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}@keyframes confetti{0%{transform:translateY(0) rotate(0);opacity:1}to{transform:translateY(-100px) rotate(720deg);opacity:0}}@keyframes glow{0%,to{box-shadow:0 0 20px #ff6b6b66}50%{box-shadow:0 0 40px #ff6b6b99}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes bounceIn{0%{opacity:0;transform:scale(.3)}50%{transform:scale(1.05)}70%{transform:scale(.9)}to{opacity:1;transform:scale(1)}}.header{display:flex;justify-content:space-between;align-items:center;padding:var(--space-md) var(--space-xl);background:var(--bg-card);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.logo{display:flex;align-items:center;gap:var(--space-sm)}.logo-icon{font-size:2rem}.logo-text{display:flex;align-items:baseline;font-family:var(--font-display);font-weight:700}.logo-number{font-size:2rem;color:var(--color-primary)}.logo-minute{font-size:1.5rem;color:var(--color-secondary)}.logo-academy{font-size:1.5rem;color:var(--text-primary);margin-left:4px}.nav{display:flex;gap:var(--space-md);flex-wrap:wrap}.env-badge{display:inline-flex;align-items:center;justify-content:center;padding:6px 10px;border-radius:var(--radius-full);font-family:var(--font-display);font-weight:800;font-size:.8rem;letter-spacing:.06em;color:#3a2a00;background:linear-gradient(135deg,#ffe66d,#ff9f43);border:2px solid rgba(58,42,0,.12);box-shadow:var(--shadow-sm);-webkit-user-select:none;user-select:none}.dev-tier{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border-radius:var(--radius-full);background:#0000000a;border:1px solid rgba(0,0,0,.08);-webkit-user-select:none;user-select:none}.dev-tier-label{font-family:var(--font-display);font-weight:900;font-size:.78rem;letter-spacing:.06em;color:var(--text-secondary);text-transform:uppercase}.dev-tier-select{border:none;outline:none;background:transparent;font-family:var(--font-display);font-weight:950;color:var(--text-primary);cursor:pointer}.nav-item{display:flex;align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-full);font-family:var(--font-display);font-weight:500;font-size:.95rem;cursor:pointer;transition:all var(--transition-fast)}.nav-item.streak{background:linear-gradient(135deg,#fff0e0,#ffe0c0);color:var(--color-orange-dark)}.nav-item.points{background:linear-gradient(135deg,#fff9e0,#fff0a3);color:#b8860b}.nav-item.link{background:#a06cd51f;color:#4b2d6b;border:1px solid rgba(160,108,213,.25)}.nav-item.link.browse{background:#4ecdc41f;color:#1c6b66;border:1px solid rgba(78,205,196,.28)}.nav-item.button{background:#0000000d;border:1px solid rgba(0,0,0,.08);color:var(--text-primary)}.nav-item.button:hover{background:#00000014}@media(max-width:768px){.header{padding:var(--space-md);flex-wrap:wrap;gap:var(--space-md)}.nav{width:100%;justify-content:center;gap:var(--space-sm)}.nav-item{padding:10px 12px;font-size:.92rem}.logo-text{font-size:.9rem}.logo-number{font-size:1.5rem}.logo-minute,.logo-academy{font-size:1.2rem}}.home{min-height:100vh;display:flex;flex-direction:column}.home-main{flex:1;padding:var(--space-xl) var(--space-lg);max-width:1200px;margin:0 auto;width:100%}.hero{text-align:center;padding:var(--space-3xl) 0}.hero-badge{display:inline-block;background:linear-gradient(135deg,var(--color-accent) 0%,var(--color-orange) 100%);padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-full);font-family:var(--font-display);font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-lg);box-shadow:var(--shadow-md)}.hero-title{font-size:clamp(2.5rem,6vw,4rem);font-weight:700;margin-bottom:var(--space-lg);line-height:1.1}.hero-title .highlight{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto;line-height:1.8}.hero-cta{display:flex;justify-content:center;gap:var(--space-md);margin-top:var(--space-xl);flex-wrap:wrap}.cta{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:var(--radius-full);font-family:var(--font-display);font-weight:700;box-shadow:var(--shadow-sm);transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.cta:hover{transform:translateY(-1px);box-shadow:var(--shadow-md)}.cta.primary{color:var(--text-primary);background:linear-gradient(135deg,var(--color-accent) 0%,var(--color-orange) 100%)}.cta.secondary{color:var(--text-primary);background:#0000000d;border:1px solid rgba(0,0,0,.08)}.subjects-section{padding:var(--space-2xl) 0}.home-loading,.home-error{max-width:720px;margin:0 auto var(--space-lg);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow-sm)}.home-loading{text-align:center;color:var(--text-secondary)}.home-error{border:2px dashed rgba(255,107,107,.35)}.home-error-sub{margin-top:6px;color:var(--text-secondary);font-size:.95rem}.section-title{font-size:2rem;text-align:center;margin-bottom:var(--space-xl)}.subjects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--space-lg);padding:var(--space-md) 0}.how-it-works{padding:var(--space-3xl) 0;position:relative}.how-it-works:before{content:"";position:absolute;inset:-12px;border-radius:var(--radius-xl);background:radial-gradient(700px 240px at 18% 10%,rgba(255,107,107,.2),transparent 60%),radial-gradient(620px 240px at 82% 0%,rgba(78,205,196,.18),transparent 60%),radial-gradient(640px 260px at 50% 100%,rgba(147,51,234,.1),transparent 62%);filter:blur(0px);z-index:-1}.how-header{text-align:center}.section-subtitle{margin:10px auto 0;max-width:720px;color:var(--text-secondary);line-height:1.7;font-size:1.05rem}.how-grid{margin-top:var(--space-xl);display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-md)}.how-card{background:#ffffffb3;border:1px solid rgba(0,0,0,.06);border-radius:var(--radius-xl);padding:var(--space-lg);box-shadow:var(--shadow-sm);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.how-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}.how-top{display:flex;align-items:center;justify-content:space-between;gap:var(--space-md)}.how-num{font-family:var(--font-display);font-weight:1000;letter-spacing:.06em;font-size:.95rem;color:var(--text-secondary);background:#0000000a;border:1px solid rgba(0,0,0,.07);padding:6px 10px;border-radius:var(--radius-full)}.how-icon{width:38px;height:38px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;font-size:1.25rem;background:linear-gradient(135deg,#ff6b6b2e,#4ecdc429);border:1px solid rgba(0,0,0,.06)}.how-title{margin:var(--space-md) 0 0;font-size:1.15rem}.how-body{margin:8px 0 0;color:var(--text-secondary);line-height:1.65;font-size:.98rem}.how-meta{margin-top:var(--space-md);display:inline-flex;align-items:center;justify-content:center;padding:7px 12px;border-radius:var(--radius-full);font-weight:900;font-size:.92rem;color:var(--text-primary);background:linear-gradient(135deg,#ff6b6b29,#9333ea1f);border:1px solid rgba(0,0,0,.06)}.how-notes{margin-top:var(--space-lg);display:flex;justify-content:center;flex-wrap:wrap;gap:var(--space-sm)}.how-chip{background:#0000000a;border:1px solid rgba(0,0,0,.07);color:var(--text-secondary);padding:9px 12px;border-radius:var(--radius-full);font-weight:800;font-size:.95rem}.how-cta{display:flex;justify-content:center;margin-top:var(--space-xl)}@media(max-width:768px){.how-grid{grid-template-columns:1fr}.how-card{padding:var(--space-md)}.hero-title{font-size:2rem}.hero-subtitle{font-size:1rem}.hero-cta{gap:var(--space-sm)}}@media(max-width:1100px){.how-grid{grid-template-columns:repeat(2,1fr)}}.star-rating{display:inline-flex;align-items:center;gap:10px}.star-row{display:inline-flex;align-items:center;gap:4px}.star{border:none;background:transparent;cursor:pointer;padding:0;line-height:1;transition:transform .12s ease,opacity .12s ease;color:#2d343659}.star.on{color:#f59e0b}.star:disabled{cursor:default;opacity:1}.star:not(:disabled):hover{transform:translateY(-1px) scale(1.06)}.star-rating.sm .star{font-size:16px}.star-rating.md .star{font-size:20px}.star-rating.lg .star{font-size:26px}.star-meta{display:inline-flex;align-items:baseline;gap:8px;color:#2d3436a6;font-weight:750}.star-value{font-variant-numeric:tabular-nums}.star-count{font-size:.95rem}.subject-card{position:relative;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-md);transition:all var(--transition-normal);border:3px solid transparent}.subject-card:before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:var(--card-color)}.subject-card:hover{border-color:var(--card-color)}.subject-card.coming-soon{opacity:.7;cursor:not-allowed}.subject-card.coming-soon:hover{border-color:transparent}.card-link{display:block;height:100%}.card-content{padding:var(--space-xl);position:relative;z-index:1}.completed-ribbon{position:absolute;top:var(--space-lg);right:var(--space-lg);padding:6px 10px;border-radius:var(--radius-full);font-family:var(--font-display);font-weight:800;font-size:.82rem;background:linear-gradient(135deg,#e8f5e9,#c8e6c9);color:#1b5e20;border:1px solid rgba(46,125,50,.25);box-shadow:var(--shadow-sm)}.card-emoji{font-size:3.5rem;margin-bottom:var(--space-md);display:inline-block}.card-title{font-size:1.5rem;font-weight:600;margin-bottom:var(--space-sm);color:var(--text-primary)}.card-description{color:var(--text-secondary);font-size:1rem;margin-bottom:var(--space-lg);line-height:1.6}.card-footer{display:flex;gap:var(--space-sm);flex-wrap:wrap;align-items:center}.rating-badge{display:inline-flex;align-items:center;gap:8px;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);border:1px solid rgba(245,158,11,.25);background:#f59e0b1a}.rating-text{font-size:.85rem;font-weight:700;font-family:var(--font-display);color:#78350ff2}.difficulty-badge,.completed-badge,.coming-soon-badge{padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);font-size:.85rem;font-weight:500;font-family:var(--font-display)}.difficulty-badge,.completed-badge{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);color:#2e7d32}.coming-soon-badge{background:linear-gradient(135deg,#f3e5f5,#e1bee7);color:#7b1fa2}.play-hint{position:absolute;bottom:var(--space-xl);right:var(--space-xl);font-family:var(--font-display);font-weight:600;color:var(--card-color);font-size:1rem}.card-decoration{position:absolute;inset:0;pointer-events:none;overflow:hidden}.decoration-circle{position:absolute;border-radius:50%;opacity:.1;background:var(--card-color)}.circle-1{width:150px;height:150px;top:-50px;right:-50px}.circle-2{width:100px;height:100px;bottom:-30px;left:-30px}@media(max-width:768px){.card-content{padding:var(--space-lg)}.card-emoji{font-size:2.5rem}.card-title{font-size:1.25rem}}.topics-browser{min-height:100vh}.topics-browser-main{max-width:1120px;margin:0 auto;padding:28px 20px 56px}.topics-browser-hero{margin:6px 0 18px}.topics-browser-hero h1{margin:0;font-size:34px;line-height:1.1;letter-spacing:-.02em}.topics-browser-hero p{margin:10px 0 0;color:var(--text-secondary)}.topics-browser-error{margin:14px 0 18px;padding:12px 14px;border:2px dashed rgba(255,107,107,.35);background:var(--bg-card);border-radius:14px;box-shadow:var(--shadow-sm)}.topics-browser-error-sub{margin-top:6px;opacity:.85;font-size:13px}.topics-browser-layout{display:grid;grid-template-columns:260px 1fr;gap:18px;align-items:start}.topics-sidebar{position:sticky;top:14px;padding:14px;border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow-sm);border:1px solid rgba(0,0,0,.06)}.sidebar-block+.sidebar-block{margin-top:14px;padding-top:14px;border-top:1px solid rgba(0,0,0,.06)}.sidebar-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--text-secondary);margin-bottom:10px}.categories-list{display:flex;flex-direction:column;gap:8px}.cat{text-align:left;padding:10px;border-radius:12px;border:1px solid rgba(0,0,0,.08);background:#00000008;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:10px}.cat-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cat-count{flex:0 0 auto;font-size:12px;font-weight:800;padding:2px 8px;border-radius:999px;border:1px solid rgba(0,0,0,.08);background:#ffffffb3;color:#2d3436bf}.cat:hover{border-color:#0000001f;background:#0000000d}.cat.active{border-color:#4ecdc48c;background:#4ecdc429}.filters{display:grid;grid-template-columns:1fr;gap:8px}.f{text-align:left;padding:10px;border-radius:12px;border:1px solid rgba(0,0,0,.08);background:#00000008;color:var(--text-primary);cursor:pointer}.f:hover{border-color:#0000001f;background:#0000000d}.f.active{border-color:#ff6b6b73;background:#ff6b6b1f}.topics-content{min-width:0}.topics-toolbar{padding:14px;border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow-sm);border:1px solid rgba(0,0,0,.06)}.toolbar-row{display:flex;gap:12px;align-items:center}.search{flex:1;display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:14px;border:1px solid rgba(0,0,0,.08);background:#00000008}.search-icon{opacity:.65}.search input{width:100%;border:none;outline:none;background:transparent;color:var(--text-primary);font-size:14px}.search input::placeholder{color:#2d343673}.clear{border:none;background:transparent;color:#2d3436a6;cursor:pointer;font-size:14px}.mobile-category{display:none}.mobile-category select{padding:10px 12px;border-radius:14px;border:1px solid rgba(0,0,0,.08);background:#00000008;color:var(--text-primary);outline:none}.toolbar-sub{margin-top:10px;font-size:13px;color:var(--text-secondary)}.mobile-controls{display:none}.chip-row{display:flex;gap:8px;overflow-x:auto;padding:10px 2px 2px;-webkit-overflow-scrolling:touch;scroll-snap-type:x proximity}.chip-row::-webkit-scrollbar{height:6px}.chip-row::-webkit-scrollbar-track{background:transparent}.chip-row::-webkit-scrollbar-thumb{background:#0000001f;border-radius:999px}.chip{flex:0 0 auto;display:inline-flex;align-items:center;gap:8px;padding:9px 12px;border-radius:999px;border:1px solid rgba(0,0,0,.08);background:#00000008;color:var(--text-primary);scroll-snap-align:start}.chip:hover{border-color:#0000001f;background:#0000000d}.chip.active{border-color:#4ecdc48c;background:#4ecdc429}.chip-name{max-width:210px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chip-count{font-size:12px;font-weight:800;padding:2px 7px;border-radius:999px;border:1px solid rgba(0,0,0,.08);background:#ffffffbf;color:#2d3436b3}.topics-grid{margin-top:14px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.topics-loading,.topics-empty{margin-top:14px;padding:22px 18px;border-radius:var(--radius-lg);border:1px solid rgba(0,0,0,.06);background:var(--bg-card);box-shadow:var(--shadow-sm);color:var(--text-secondary)}@media(max-width:980px){.topics-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:820px){.topics-browser-layout{grid-template-columns:1fr}.topics-sidebar,.mobile-category{display:none}.mobile-controls{display:block}.topics-browser-main{padding:18px 14px 42px}}@media(max-width:520px){.topics-browser-hero h1{font-size:28px}.topics-grid{grid-template-columns:1fr}.toolbar-row{flex-direction:column;align-items:stretch}.chip-name{max-width:160px}}.topic-page{min-height:100vh;display:flex;flex-direction:column}.topic-main{flex:1;padding:var(--space-xl) var(--space-lg);max-width:900px;margin:0 auto;width:100%}.topic-header{margin-bottom:var(--space-xl)}.back-button{display:inline-flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);background:var(--bg-card);border-radius:var(--radius-full);font-family:var(--font-display);font-weight:500;color:var(--text-secondary);box-shadow:var(--shadow-sm);transition:all var(--transition-fast)}.back-button:hover{color:var(--color-primary);transform:translate(-5px)}.topic-content{display:flex;flex-direction:column;gap:var(--space-xl)}.topic-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-2xl);box-shadow:var(--shadow-md);text-align:center;position:relative;overflow:hidden}.topic-card:before{content:"";position:absolute;top:0;left:0;right:0;height:8px;background:var(--topic-color)}.topic-emoji{font-size:5rem;margin-bottom:var(--space-lg);display:inline-block}.topic-title{font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md);color:var(--text-primary)}.topic-description{font-size:1.2rem;color:var(--text-secondary);max-width:600px;margin:0 auto var(--space-lg);line-height:1.7}.topic-meta{display:flex;justify-content:center;gap:var(--space-md);margin-bottom:var(--space-xl);flex-wrap:wrap}.meta-badge{padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-full);font-family:var(--font-display);font-weight:500;font-size:1rem}.meta-badge.duration{background:linear-gradient(135deg,#e3f2fd,#bbdefb);color:#1565c0}.meta-badge.difficulty{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);color:#2e7d32}.learning-points{background:linear-gradient(135deg,#fff9e0,#fff0a3);border-radius:var(--radius-md);padding:var(--space-lg);margin-bottom:var(--space-lg);text-align:left}.learning-points h3{font-size:1.2rem;margin-bottom:var(--space-md);color:var(--text-primary)}.learning-points ul{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-sm)}.learning-points li{padding:var(--space-sm) 0;font-size:1rem;color:var(--text-primary)}.fun-fact{background:linear-gradient(135deg,#f3e5f5,#e1bee7);border-radius:var(--radius-md);padding:var(--space-md) var(--space-lg);text-align:left}.fun-fact-label{font-family:var(--font-display);font-weight:600;color:var(--color-purple-dark)}.fun-fact p{color:var(--text-primary);margin-top:var(--space-xs)}.start-section{text-align:center;padding:var(--space-xl) 0}.topic-actions{display:grid;gap:var(--space-md);justify-items:center}.topic-action-btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-md);padding:var(--space-md) var(--space-2xl);border-radius:var(--radius-full);font-size:1.25rem;font-weight:700;border:none;cursor:pointer;transition:all var(--transition-normal)}.topic-action-btn.primary{background:#ff6b6b1f;border:2px solid rgba(255,107,107,.24);color:var(--color-primary)}.topic-action-btn.primary:hover{background:#ff6b6b2e}.topic-action-btn.secondary{background:#4ecdc424;border:2px solid rgba(78,205,196,.26);color:#0f766e}.topic-action-btn.secondary:hover{background:#4ecdc433}.start-button{display:inline-flex;align-items:center;gap:var(--space-md);padding:var(--space-lg) var(--space-2xl);background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-dark) 100%);color:#fff;border-radius:var(--radius-full);font-size:1.5rem;font-weight:600;border:none;cursor:pointer;transition:all var(--transition-normal)}.button-icon{font-size:1.8rem}.button-timer{background:#fff3;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full);font-size:1rem}.start-hint{margin-top:var(--space-lg);color:var(--text-secondary);font-size:1rem}.topic-not-found{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-lg)}.topic-not-found a{color:var(--color-primary);font-weight:600}@media(max-width:768px){.topic-card{padding:var(--space-xl)}.topic-emoji{font-size:3.5rem}.topic-title{font-size:1.8rem}.topic-description{font-size:1rem}.start-button{padding:var(--space-md) var(--space-xl);font-size:1.2rem}.topic-action-btn{padding:var(--space-md) var(--space-xl);font-size:1.1rem}.learning-points ul{grid-template-columns:1fr}}.timer{position:relative}.timer-circle{width:80px;height:80px;position:relative}.timer-circle svg{transform:rotate(-90deg);width:100%;height:100%}.timer-bg{fill:none;stroke:#e0e0e0;stroke-width:6}.timer-progress{fill:none;stroke:var(--color-secondary);stroke-width:6;stroke-linecap:round;transition:stroke .3s ease}.timer.low .timer-progress{stroke:var(--color-orange)}.timer.critical .timer-progress{stroke:var(--color-primary)}.timer-display{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}.timer-value{font-family:var(--font-display);font-size:1.2rem;font-weight:700;color:var(--text-primary);display:block}.timer.low .timer-value{color:var(--color-orange)}.timer.critical .timer-value{color:var(--color-primary)}.timer-label{font-size:.6rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}@media(max-width:768px){.timer-circle{width:60px;height:60px}.timer-value{font-size:1rem}.timer-label{font-size:.5rem}}.step{width:100%;max-width:720px;text-align:center}.step-title{font-size:2rem;margin-bottom:var(--space-md)}.step-text{color:var(--text-secondary);font-size:1.15rem;margin-bottom:var(--space-lg)}.step-emoji{font-size:5rem;margin-bottom:var(--space-md)}.step-success{margin-top:var(--space-md);font-weight:800;color:var(--color-secondary-dark)}.reveal-box{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-xl);box-shadow:var(--shadow-md);border:3px dashed var(--color-secondary);cursor:pointer;min-height:210px;display:flex;align-items:center;justify-content:center}.reveal-box.open{border-style:solid;cursor:default}.reveal-closed{display:grid;gap:var(--space-sm);color:var(--text-secondary);font-weight:700}.reveal-click{font-size:2.2rem}.reveal-items{width:100%;display:grid;gap:var(--space-md)}.reveal-item{display:flex;gap:var(--space-md);align-items:center;background:var(--bg-main);border-radius:var(--radius-md);padding:var(--space-md)}.reveal-icon{font-size:1.6rem}.reveal-text{font-weight:700}.chain-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:var(--space-sm);margin:var(--space-lg) 0}.chain-link{display:flex;align-items:center}.chain-connector{display:flex;align-items:center;padding:0 var(--space-xs)}.connector-line{width:22px;height:4px;background:var(--color-secondary);border-radius:2px;transform-origin:left}.link-emoji{font-size:1.2rem}.chain-block{background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-secondary-dark) 100%);color:#fff;border-radius:var(--radius-md);padding:var(--space-md) var(--space-lg);font-family:var(--font-display);font-weight:800;min-width:120px}.chain-block.genesis{background:linear-gradient(135deg,var(--color-purple) 0%,var(--color-purple-dark) 100%)}.chain-name{font-size:.95rem}.chain-hash{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;opacity:.9;font-size:.8rem}.step-button{padding:var(--space-md) var(--space-xl);background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-secondary-dark) 100%);color:#fff;border-radius:var(--radius-full);font-size:1.1rem;font-weight:800}.summary-points{display:grid;gap:var(--space-md);margin:var(--space-lg) 0}.summary-pill{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);border-radius:var(--radius-full);padding:var(--space-md) var(--space-xl);font-weight:800}.summary-uses{margin-top:var(--space-lg)}.uses-label{font-weight:800;color:var(--text-secondary)}.uses-icons{display:flex;justify-content:center;gap:var(--space-md);margin-top:var(--space-sm);flex-wrap:wrap}.use-icon{font-size:2rem;filter:drop-shadow(0 8px 12px rgba(0,0,0,.08))}.use-chip{display:inline-flex;align-items:center;gap:var(--space-sm);padding:10px 14px;border-radius:var(--radius-full);background:#0000000a;border:1px solid rgba(0,0,0,.06)}.use-text{font-weight:850;color:var(--text-secondary);white-space:nowrap}.summary-congrats{margin-top:var(--space-lg);font-size:1.4rem;font-weight:900;color:var(--color-primary)}.eitheror-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md);margin-top:var(--space-md)}.eitheror-btn{background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-xl);border:2px solid rgba(0,0,0,.06);box-shadow:var(--shadow-sm);text-align:center;min-height:160px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-sm)}.eitheror-btn.picked{border-color:#00000024}.eitheror-btn.correct{border-color:#2ecc718c;background:linear-gradient(135deg,#e8f5e9,#c8e6c9)}.eitheror-emoji{font-size:2.2rem}.eitheror-text{font-weight:900;font-size:1.1rem}.eitheror-reveal{margin-top:var(--space-md);font-weight:850;color:var(--text-secondary)}.eitheror-explain{margin-top:var(--space-sm);color:var(--text-secondary);font-weight:700}@media(max-width:768px){.eitheror-row{grid-template-columns:1fr}}.sprint-meter{margin:var(--space-md) auto;width:100%;max-width:520px}.sprint-meter-track{height:16px;border-radius:var(--radius-full);background:#0000000f;overflow:hidden}.sprint-meter-fill{height:100%;transform-origin:left;background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-secondary-dark) 100%)}.sprint-meter-label{margin-top:var(--space-xs);font-weight:900;color:var(--text-secondary)}.sprint-button{margin-top:var(--space-lg);width:100%;max-width:520px;padding:var(--space-xl);border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-secondary-dark) 100%);color:#fff;box-shadow:var(--shadow-md)}.sprint-button.done{opacity:.95}.sprint-button-inner{font-weight:1000;font-size:2rem;letter-spacing:.08em}.sprint-sub{margin-top:var(--space-sm);opacity:.9;font-weight:800}@media(max-width:768px){.step-title{font-size:1.6rem}.step-text{font-size:1rem}.step-emoji{font-size:4rem}.chain-row{flex-direction:column}.chain-connector{transform:rotate(90deg)}}.lesson-renderer{max-width:820px;margin:0 auto;min-height:520px;display:flex;flex-direction:column}.lesson-renderer-step{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--space-xl)}.lesson-renderer-empty{max-width:700px;margin:0 auto;text-align:center;background:var(--bg-card);border-radius:var(--radius-lg);padding:var(--space-2xl);box-shadow:var(--shadow-md)}.lesson-renderer-dots{display:flex;justify-content:center;gap:var(--space-sm);padding:var(--space-lg)}.lesson-dot{width:12px;height:12px;border-radius:50%;background:#e3e3e3}.lesson-dot.active{background:var(--color-primary);transform:scale(1.2)}.lesson-dot.done{background:var(--color-secondary)}.lesson-review{min-height:100vh;background:var(--bg-gradient);display:flex;flex-direction:column}.review-topbar{position:sticky;top:0;z-index:120;display:grid;grid-template-columns:120px 1fr 120px;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:#ffffffd9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,0,0,.06)}.review-back{justify-self:start;border:none;background:#0000000d;padding:10px 14px;border-radius:var(--radius-full);font-weight:800;cursor:pointer}.review-back:hover{background:#00000014}.review-title{justify-self:center;text-align:center;font-weight:950;letter-spacing:-.02em}.review-sub{margin-top:2px;font-size:.9rem;font-weight:700;color:var(--text-secondary)}.review-spacer{width:1px;height:1px}.review-progress{padding:var(--space-md) var(--space-lg)}.review-progress-bar{height:10px;border-radius:var(--radius-full);background:#00000014;overflow:hidden}.review-progress-fill{height:100%;background:linear-gradient(90deg,var(--color-secondary) 0%,var(--color-primary) 100%)}.review-progress-text{margin-top:var(--space-xs);color:var(--text-secondary);font-weight:800;text-align:center}.review-steppicker{display:flex;gap:var(--space-sm);padding:0 var(--space-lg);overflow-x:auto;-webkit-overflow-scrolling:touch}.review-chip{flex:0 0 auto;display:inline-flex;align-items:center;gap:var(--space-sm);max-width:340px;border:2px solid rgba(0,0,0,.08);background:#ffffffb3;border-radius:var(--radius-full);padding:10px 12px;cursor:pointer}.review-chip:hover{border-color:#00000024}.review-chip.active{border-color:#4ecdc48c;background:#4ecdc41f}.review-chip.done{border-color:#2ecc718c}.review-chip-num{display:inline-flex;width:26px;height:26px;align-items:center;justify-content:center;border-radius:50%;background:#0000000f;font-weight:950}.review-chip-title{font-weight:850;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.review-step{flex:1;display:flex;padding:var(--space-lg)}.review-step-inner{width:100%;display:flex;justify-content:center}.review-nav{display:flex;justify-content:center;gap:var(--space-md);padding:var(--space-lg)}.review-nav-btn{border:none;cursor:pointer;padding:var(--space-md) var(--space-xl);border-radius:var(--radius-full);background:#0000000f;font-weight:900}.review-nav-btn.primary{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-dark) 100%);color:#fff}.review-nav-btn:disabled{opacity:.5;cursor:default}.review-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-xl);text-align:center}.review-empty p{color:var(--text-secondary)}@media(max-width:768px){.review-topbar{grid-template-columns:100px 1fr 40px;padding:var(--space-sm) var(--space-md)}.review-chip{max-width:260px}.review-step{padding:var(--space-md)}}.lesson-page{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-gradient)}.countdown-screen{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--space-xl)}.countdown-content{text-align:center;max-width:500px}.countdown-content h1{font-size:2.5rem;margin-bottom:var(--space-md);color:var(--text-primary)}.countdown-content p{font-size:1.2rem;color:var(--text-secondary);margin-bottom:var(--space-xl)}.countdown-tips{display:flex;justify-content:center;gap:var(--space-md);margin-bottom:var(--space-2xl);flex-wrap:wrap}.tip{background:var(--bg-card);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-full);font-size:.95rem;box-shadow:var(--shadow-sm)}.begin-button{padding:var(--space-lg) var(--space-2xl);font-size:1.5rem;font-weight:600;background:linear-gradient(135deg,var(--color-secondary) 0%,var(--color-secondary-dark) 100%);color:#fff;border-radius:var(--radius-full);border:none;cursor:pointer}.lesson-container{flex:1;display:flex;flex-direction:column}.lesson-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-xl);background:var(--bg-card);box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:100}.progress-container{flex:1;max-width:400px;margin:0 var(--space-xl)}.progress-bar{height:12px;background:#e0e0e0;border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-secondary) 0%,var(--color-primary) 100%);border-radius:var(--radius-full)}.progress-text{display:block;text-align:center;font-size:.85rem;color:var(--text-secondary);margin-top:var(--space-xs);font-family:var(--font-display)}.exit-button{width:40px;height:40px;border-radius:50%;background:var(--bg-main);border:none;font-size:1.2rem;cursor:pointer;transition:all var(--transition-fast)}.exit-button:hover{background:var(--color-primary-light);color:#fff}.lesson-content{flex:1;padding:var(--space-xl);overflow-y:auto}.completion-screen{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--space-xl);position:relative;overflow:hidden}.completion-content{text-align:center;background:var(--bg-card);padding:var(--space-2xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);position:relative;z-index:10;width:100%;max-width:760px}.completion-emoji{font-size:5rem;margin-bottom:var(--space-lg)}.completion-content h1{font-size:2.5rem;margin-bottom:var(--space-md);background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.completion-content p{font-size:1.2rem;color:var(--text-secondary);margin-bottom:var(--space-xl)}.completion-stats{display:flex;justify-content:center;gap:var(--space-xl);margin-bottom:var(--space-xl)}.stat{display:flex;flex-direction:column;align-items:center;padding:var(--space-md) var(--space-xl);background:linear-gradient(135deg,#fff9e0,#ffe66d);border-radius:var(--radius-md)}.stat-value{font-size:2rem;font-family:var(--font-display);font-weight:700;color:var(--color-orange-dark)}.stat-label{font-size:.9rem;color:var(--text-secondary)}.completion-actions{display:flex;gap:var(--space-md);justify-content:center;flex-wrap:wrap}.completion-panel{margin-top:var(--space-md);padding:var(--space-lg);background:var(--bg-main);border:1px solid rgba(0,0,0,.06);border-radius:var(--radius-md);text-align:left}.completion-progress{text-align:center}.completion-panel-title{margin:0;font-weight:900;color:var(--text-primary)}.completion-panel-subtitle{margin:6px 0 0;opacity:.85;font-size:14px;color:var(--text-secondary)}.completion-panel-error{margin-top:10px;color:#b91c1c;font-weight:700;font-size:13px}.completion-rating-header{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-md)}.completion-rating-body{margin-top:var(--space-md);display:flex;align-items:center;justify-content:space-between;gap:var(--space-md);flex-wrap:wrap}.completion-rating-meta{font-weight:800;color:var(--text-secondary)}.completion-signin{padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-full);border:2px solid var(--color-primary);background:transparent;color:var(--text-primary);font-weight:800;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.completion-signin:hover{background:var(--color-primary-light);border-color:var(--color-primary-light);color:#fff}.action-button{padding:var(--space-md) var(--space-xl);font-size:1.1rem;font-weight:600;border-radius:var(--radius-full);border:none;cursor:pointer;transition:all var(--transition-fast)}.action-button.primary{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-primary-dark) 100%);color:#fff}.action-button.secondary{background:var(--bg-main);color:var(--text-primary);border:2px solid var(--color-primary)}.confetti-container{position:fixed;inset:0;pointer-events:none;overflow:hidden}.confetti{position:absolute;width:10px;height:10px;border-radius:2px}.lesson-error{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-lg)}.lesson-error button{padding:var(--space-md) var(--space-xl);background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-full);font-size:1rem;cursor:pointer}@media(max-width:768px){.lesson-header{padding:var(--space-sm) var(--space-md);flex-wrap:wrap;gap:var(--space-sm)}.progress-container{order:3;width:100%;max-width:none;margin:0}.countdown-content h1{font-size:1.8rem}.begin-button{padding:var(--space-md) var(--space-xl);font-size:1.2rem}.completion-content{padding:var(--space-xl)}.completion-panel{padding:var(--space-md)}.completion-rating-header{flex-direction:column;align-items:flex-start}.completion-rating-body{justify-content:flex-start}.completion-emoji{font-size:3.5rem}.completion-content h1{font-size:1.8rem}}.review-page{min-height:100vh}.review-loading,.review-error{min-height:100vh;display:grid;place-items:center;color:var(--text-secondary);padding:var(--space-xl)}.review-error{color:var(--text-primary)}.review-error button{margin-top:14px;border:none;background:#4ecdc42e;border:1px solid rgba(78,205,196,.35);padding:10px 14px;border-radius:var(--radius-full);font-weight:800;cursor:pointer}.upgrade-page{min-height:100vh;display:flex;flex-direction:column}.upgrade-main{flex:1;padding:var(--space-xl) var(--space-lg);max-width:980px;margin:0 auto;width:100%}.upgrade-card{background:var(--bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:var(--space-xl);border:1px solid rgba(0,0,0,.06)}.upgrade-hero{display:flex;gap:var(--space-md);align-items:center;margin-bottom:var(--space-lg)}.upgrade-emoji{font-size:2.4rem}.upgrade-hero h1{margin:0;font-size:2.3rem;line-height:1.05;letter-spacing:-.02em;background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.upgrade-hero p{margin:6px 0 0;color:var(--text-secondary)}.upgrade-tier{margin-top:8px;color:var(--text-secondary);font-weight:700}.upgrade-tier-actions{margin-top:10px}.upgrade-manage-btn{border:none;cursor:pointer;border-radius:var(--radius-full);padding:10px 12px;font-weight:950;background:#4ecdc429;border:1px solid rgba(78,205,196,.3);color:#0f766e}.upgrade-manage-btn:hover{background:#4ecdc438}.upgrade-section{margin-top:var(--space-md)}.upgrade-section-title{font-weight:950;color:var(--text-secondary);margin-bottom:var(--space-sm)}.upgrade-section-sub{margin-top:-6px;margin-bottom:var(--space-sm);color:var(--text-secondary);font-weight:650;line-height:1.35}.upgrade-section-spaced{margin-top:18px}.tier-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md)}.tier-card{border-radius:var(--radius-xl);padding:var(--space-lg);border:2px solid rgba(0,0,0,.06);background:#00000004;position:relative;overflow:hidden;transition:transform var(--transition-fast),box-shadow var(--transition-fast),border-color var(--transition-fast)}.tier-card:hover{transform:translateY(-2px);box-shadow:0 18px 40px #00000014}.tier-card.current{border-color:#4ecdc459;background:#4ecdc40f}.tier-current-badge{display:inline-flex;align-items:center;justify-content:center;padding:6px 10px;border-radius:var(--radius-full);background:#4ecdc429;border:1px solid rgba(78,205,196,.28);color:#0f766e;font-weight:950;font-size:.85rem;margin-bottom:10px;max-width:calc(100% - 210px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.tier-card.featured{background:#ff6b6b0f;border-color:#ff6b6b2e}.tier-badge{position:absolute;top:14px;right:14px;padding:6px 10px;border-radius:var(--radius-full);background:#ff6b6b24;border:1px solid rgba(255,107,107,.24);color:var(--color-primary);font-weight:950;font-size:.85rem;max-width:calc(100% - 28px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.tier-name{font-weight:950;letter-spacing:.12em;text-transform:uppercase;color:var(--text-secondary);font-size:.9rem}.tier-price{margin-top:8px;font-size:2.2rem;line-height:1.05;font-weight:1100;color:var(--text-primary);font-family:var(--font-display)}.tier-card.featured .tier-price{background:linear-gradient(135deg,var(--color-primary) 0%,var(--color-orange) 50%,var(--color-purple) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tier-note{margin-top:6px;color:var(--text-secondary);font-weight:750}.tier-bullets{margin:var(--space-md) 0 0;padding-left:18px;color:var(--text-secondary);font-weight:650}.tier-bullets li{margin:8px 0}.tier-actions{margin-top:var(--space-md)}.tier-rule{margin-top:var(--space-md);color:var(--text-secondary);font-weight:650}.compare{margin-top:var(--space-lg);border-radius:var(--radius-xl);border:1px solid 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