@import"https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800&family=Caveat:wght@600;700&family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500;600&display=swap";:root{--glass-blur: 14px;--on-amber: #15171c;--r-sm: 14px;--r-md: 17px;--r-lg: 24px;--r-xl: 42px;--r-full: 999px;--s1: 5px;--s2: 10px;--s3: 14px;--s4: 18px;--s5: 26px;--s6: 51px;--ease: cubic-bezier(.16, 1, .3, 1);--dur: .28s;--paper: #14161b;--paper-warm: #1d2027;--amber: #ffe8b8;--amber-deep: #e7c786;--green: #e8ffc2;--ink: #fbf7ec;--ink-soft: #adaba3;--ink-faint: #7c7a74;--cream-text: #15171c;--line: rgba(255, 255, 255, .085);--line-strong: rgba(255, 255, 255, .16);--hover: rgba(255, 255, 255, .06);--track-soft: rgba(255, 232, 184, .45);--panel-bg: #0d0f13;--code-bg: #0a0c10;--panel-text: #fff9ed;--glass: rgba(255, 255, 255, .045);--glass-solid: rgba(255, 255, 255, .072);--shadow-card: rgba(0, 0, 0, .5) 0 18px 44px 0, rgba(0, 0, 0, .32) 0 6px 16px 0, rgba(255, 255, 255, .055) 0 1px 0 0 inset, rgba(0, 0, 0, .4) 0 -1px 0 0 inset;--shadow-soft: rgba(0, 0, 0, .42) 0 4px 14px 0;--shadow-lift: rgba(0, 0, 0, .62) 0 28px 64px -12px, rgba(0, 0, 0, .34) 0 8px 20px 0}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:Geist,ui-sans-serif,system-ui,sans-serif;background:var(--paper);color:var(--ink);line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}a{color:inherit;text-decoration:none}::selection{background:var(--amber);color:var(--on-amber)}.page-pad{padding:clamp(8px,1.4vw,18px)}.master-shell{position:relative;border-radius:var(--r-lg);overflow:clip;background:radial-gradient(120% 80% at 80% -10%,var(--paper-warm) 0%,transparent 55%),var(--paper);border:1px solid var(--line);box-shadow:var(--shadow-card);isolation:isolate}#topographic-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:0;display:block;pointer-events:none}#topographic-canvas,.field-fallback{-webkit-mask-image:linear-gradient(to bottom,#000 0,#000 30vh,transparent 80vh);mask-image:linear-gradient(to bottom,#000 0,#000 30vh,transparent 80vh)}.noise{position:absolute;inset:0;z-index:1;pointer-events:none;opacity:.32;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E")}.soft-vignette{position:absolute;inset:0;z-index:1;pointer-events:none;background:radial-gradient(130% 100% at 50% 0%,transparent 52%,rgba(0,0,0,.5) 100%)}.shell-content{position:relative;z-index:2}.field-fallback{position:absolute;inset:0;z-index:0;background:radial-gradient(60% 50% at 78% 8%,rgba(255,232,184,.18) 0%,transparent 60%),radial-gradient(50% 45% at 12% 30%,rgba(232,255,194,.1) 0%,transparent 55%),radial-gradient(70% 60% at 50% 100%,rgba(242,212,154,.1) 0%,transparent 60%)}.wrap{width:min(1180px,100%);margin-inline:auto;padding-inline:clamp(20px,4vw,48px)}.wrap-narrow{width:min(880px,100%);margin-inline:auto;padding-inline:clamp(20px,4vw,48px)}.section{padding-block:clamp(64px,9vw,118px)}.nav{position:sticky;top:clamp(8px,1.4vw,18px);z-index:50;margin:clamp(8px,1.4vw,16px) auto 0;width:fit-content;max-width:calc(100% - 24px)}.nav-inner{display:flex;align-items:center;gap:10px;padding:7px 7px 7px 16px;border-radius:var(--r-full);background:var(--glass-solid);border:1px solid var(--line);box-shadow:var(--shadow-soft);backdrop-filter:blur(var(--glass-blur)) saturate(1.4);-webkit-backdrop-filter:blur(var(--glass-blur)) saturate(1.4)}.brand{display:flex;align-items:center;gap:9px;font-weight:700;letter-spacing:-.02em}.brand .mark{width:30px;height:30px;border-radius:9px;flex:none;overflow:hidden;box-shadow:inset 0 1px #ffffff80,0 0 0 1px #15171c0f}.mark svg{display:block;width:100%;height:100%}.brand b{font-size:14px;white-space:nowrap}.nav-links{display:flex;gap:2px;margin-left:4px}.nav-links a{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:500;color:var(--ink-soft);padding:8px 13px;border-radius:var(--r-full);transition:color var(--dur) var(--ease),background var(--dur) var(--ease)}.nav-links .nav-highlight{color:var(--amber)}.nav-links a:hover,.nav-links a.active{color:var(--ink);background:var(--hover)}.nav-cta{display:flex;align-items:center;gap:6px;margin-left:6px;padding-left:8px;border-left:1px solid var(--line)}.nav-burger{display:none;width:38px;height:38px;place-items:center;border-radius:50%;background:var(--glass);border:1px solid var(--line);color:var(--ink-soft);cursor:pointer;margin-left:4px}.nav-burger:hover{color:var(--ink);background:var(--glass-solid)}.nav-mobile{display:none}.nav-login{font-size:13px;font-weight:600;color:var(--ink-soft);padding:9px 13px;border-radius:var(--r-full)}.nav-login:hover{color:var(--ink)}.nav-icon{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:var(--glass);border:1px solid var(--line);color:var(--ink-soft);cursor:pointer;position:relative}.nav-icon:hover{color:var(--ink);background:var(--glass-solid)}.nav-icon svg{width:18px;height:18px}.nav-icon .dotred{position:absolute;top:8px;right:9px;width:7px;height:7px;border-radius:50%;background:#ff6b57;border:2px solid var(--paper)}.nav-user{display:flex;align-items:center;gap:9px;padding:5px 12px 5px 6px;border-radius:var(--r-full);background:var(--glass);border:1px solid var(--line)}.nav-user:hover{background:var(--glass-solid)}.nav-user .avatar{width:28px;height:28px;font-size:13px}.nav-user 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svg{width:12px;height:12px}.overlay-tag.count{letter-spacing:.04em;text-transform:none}.overlay-tag.muted{background:#12141999;color:var(--ink-soft);border-color:var(--line);text-transform:none;-webkit-backdrop-filter:none;backdrop-filter:none}.card-no{font-family:Archivo;font-weight:700;font-size:13px;color:var(--ink-faint);letter-spacing:-.02em}.card h3{font-family:Archivo;font-weight:700;font-size:clamp(20px,2.4vw,25px);line-height:1.05;letter-spacing:-.04em;margin:46px 0 0}.card p{font-size:13.5px;color:var(--ink-soft);margin-top:12px;line-height:1.6}.card-foot{display:flex;align-items:center;justify-content:space-between;margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}.card-meta{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--ink-faint);font-weight:500}.card-meta 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p{margin:0;font-size:13.5px;line-height:1.6;color:var(--ink-soft)}.callout b{color:var(--ink)}.lesson-nav{display:flex;gap:14px;max-width:720px;margin:48px auto 0}.lnav-ph{flex:1}.lnav{flex:1;display:flex;align-items:center;gap:14px;padding:18px 20px;border-radius:var(--r-md);background:var(--glass);border:1px solid var(--line);transition:background var(--dur) var(--ease),transform var(--dur) var(--ease)}.lnav:hover{background:var(--glass-solid);transform:translateY(-2px)}.lnav.next{justify-content:flex-end;text-align:right}.lnav .nav-ic{width:38px;height:38px;flex:none;border-radius:50%;display:grid;place-items:center;background:var(--paper-warm);border:1px solid var(--line);color:var(--ink)}.lnav.next .nav-ic{background:var(--amber);color:var(--on-amber);border-color:transparent}.lnav .nav-ic svg{width:18px;height:18px}.lnav .lab{display:block;font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.06em;font-weight:600}.lnav 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button{text-align:left;background:none;border:none;cursor:pointer;font-family:Geist;font-size:13px;color:var(--ink);padding:8px 10px;border-radius:var(--r-sm)}.c-menu-pop button:hover{background:var(--glass)}.c-menu-pop button.danger{color:#ff8a8a}.edit-box{margin:4px 0 2px}.edit-box textarea{width:100%;min-height:76px;max-height:320px;overflow-y:auto;resize:none;box-sizing:border-box;border-radius:var(--r-lg);border:1px solid var(--line);background:var(--glass);color:var(--ink);padding:12px 14px;font-family:Geist;font-size:14px;line-height:1.6}.edit-box textarea:focus{outline:none;border-color:var(--amber)}.c-confirm{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:10px;padding:10px 12px;border-radius:var(--r-md);border:1px solid var(--line);background:var(--glass);font-size:13px;color:var(--ink-soft)}.c-confirm-actions{display:flex;gap:8px;margin-left:auto}.c-confirm-yes,.c-confirm-no{display:inline-flex;align-items:center;gap:6px;cursor:pointer;font-family:Geist;font-size:12.5px;font-weight:600;padding:6px 12px;border-radius:var(--r-full);border:1px solid var(--line);background:none}.c-confirm-yes{color:#15171c;background:#ff8a8a;border-color:transparent}.c-confirm-yes:disabled{opacity:.6;cursor:default}.c-confirm-no{color:var(--ink-soft)}.c-confirm-no:hover{color:var(--ink)}.c-body{font-size:14px;line-height:1.65;color:var(--ink-soft);margin:0}.c-body>:first-child{margin-top:0}.c-body>:last-child{margin-bottom:0}.c-body p{margin:0 0 10px}.c-body ul,.c-body ol{margin:0 0 10px;padding-left:22px}.c-body a{color:var(--amber);text-decoration:underline;text-underline-offset:2px}.c-body code{font-family:Geist Mono,ui-monospace,monospace;font-size:.9em;background:var(--glass);border:1px solid var(--line);border-radius:5px;padding:1px 5px}.c-body pre{background:var(--glass);border:1px solid var(--line);border-radius:var(--r-lg);padding:12px 14px;overflow-x:auto;margin:0 0 10px}.c-body pre code{background:none;border:none;padding:0}.c-body blockquote{margin:0 0 10px;padding-left:12px;border-left:3px solid var(--line);color:var(--ink-faint)}.c-body table{border-collapse:collapse;margin:0 0 10px}.c-body th,.c-body td{border:1px solid var(--line);padding:5px 9px}.c-img{max-width:100%;max-height:420px;height:auto;border-radius:var(--r-lg);border:1px solid var(--line);margin:4px 0}.cf-tools{flex:1;display:flex;align-items:center;gap:8px}.cf-attach{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--r-md, 8px);border:1px solid var(--line);background:var(--glass);color:var(--ink-soft);cursor:pointer}.cf-attach:hover:not(:disabled){border-color:var(--amber);color:var(--ink)}.cf-attach:disabled{opacity:.5;cursor:default}.cf-sep{color:var(--line);font-size:13px;-webkit-user-select:none;user-select:none}.rb-actions .cf-attach{margin-right:auto}.cf-error{font-size:12px;color:var(--danger, #e5484d)}.c-actions{display:flex;gap:14px;margin-top:8px}.c-act{display:inline-flex;align-items:center;gap:5px;background:none;border:none;cursor:pointer;font-family:Geist;font-size:12.5px;color:var(--ink-faint);padding:0}.c-act:hover{color:var(--amber);background-color:transparent}.reply-box{display:flex;gap:12px;margin-top:14px}.c-replies{margin-top:18px;padding-left:20px;border-left:1px solid var(--line);display:flex;flex-direction:column;gap:20px}.comment.reply .avatar{width:32px;height:32px;font-size:13px}.comments-more{display:flex;justify-content:center;margin-top:28px}.disc-top{padding-top:clamp(28px,5vw,56px)}.disc-body{padding-bottom:clamp(56px,9vw,100px)}.disc-top .crumb,.disc-top .disc-hero{max-width:720px;margin-inline:auto}.disc-hero{display:block}.disc-hero-in{display:flex;align-items:stretch;min-height:128px;border-radius:calc(var(--r-lg) - 1px);background:var(--glass-solid);overflow:hidden}.disc-hero-in .cover{flex:0 0 200px;aspect-ratio:auto}.disc-hero-body{flex:1 1 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svg{width:16px;height:16px}.empty-hint{text-align:center;color:var(--ink-faint);font-size:13px;padding:30px}.cert-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;padding-bottom:clamp(64px,9vw,110px)}.cc{display:flex;flex-direction:column}.cc-banner{position:relative;aspect-ratio:16/7;display:grid;place-items:center;border-bottom:1px solid var(--line);background:radial-gradient(120% 90% at 80% -10%,#fff4de,transparent 55%),#fffdf6;color:#15171c}.cc-banner .seal{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--amber),var(--amber-deep));color:#5a4322;box-shadow:0 6px 14px #b98a454d}.cc-banner .seal svg{width:24px;height:24px}.cc-banner .mini-eyebrow{position:absolute;top:14px;left:0;right:0;text-align:center;font-size:9px;font-weight:700;letter-spacing:.34em;text-transform:uppercase;color:#b98a45}.cc-banner 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.btn{flex:1;justify-content:center}.cc-prog{display:flex;align-items:center;gap:12px;margin-top:16px;margin-bottom:16px}.cc-prog .pb{flex:1;height:7px;border-radius:var(--r-full);background:#ffffff14;overflow:hidden;border:1px solid var(--line)}.cc-prog .pb i{display:block;height:100%;border-radius:var(--r-full);background:linear-gradient(90deg,var(--amber-deep),var(--amber))}.cc-prog .pn{font-size:12px;font-weight:700;font-family:Archivo;min-width:34px;text-align:right}@media(max-width:760px){.cert-list{grid-template-columns:1fr}}.cert-stage{padding-block:clamp(28px,4vw,52px)}.cert-controls{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:26px}.cert-controls .back{display:inline-flex;align-items:center;gap:9px;font-size:13px;font-weight:600;color:var(--ink-soft)}.cert-controls .back:hover{color:var(--ink)}.cert-controls .back svg{width:15px;height:15px}.cert-controls 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78%,0 100%)}.cert-id{position:absolute;left:0;right:0;bottom:clamp(12px,2.4%,20px);text-align:center;font-family:Geist;font-size:clamp(8.5px,.95vw,10.5px);letter-spacing:.04em;color:#15171c6b}@media(max-width:760px){.cert{aspect-ratio:auto;min-height:560px}.cert-foot{position:static;margin-top:30px}.cert-body{position:static}}@media print{@page{size:A4 landscape;margin:10mm}html,body{background:#fff!important}.page-pad{padding:0!important}.master-shell{background:#fff!important;border:none!important;box-shadow:none!important;border-radius:0!important}#topographic-canvas,.field-fallback,.noise,.soft-vignette{display:none!important}.shell-content>*:not(.cert-stage){display:none!important}.no-print{display:none!important}.cert-stage{padding:0!important}.cert-scroll{overflow:visible!important}.cert{width:100%!important;box-shadow:none!important;margin:0!important}*{-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important}}.verify-wrap{width:min(620px,100%);margin-inline:auto;padding-bottom:clamp(64px,9vw,110px)}.verify-search{display:flex;gap:10px;margin-bottom:30px}.vs-field{position:relative;flex:1}.vs-field svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--ink-faint);pointer-events:none}.vs-field input{width:100%;font-family:Geist;font-size:14.5px;color:var(--ink);padding:14px 15px 14px 44px;border-radius:var(--r-full);background:var(--glass);border:1px solid var(--line);transition:border-color var(--dur) var(--ease),background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}.vs-field input::placeholder{color:var(--ink-faint)}.vs-field input:focus{outline:none;border-color:var(--amber);background:var(--glass-solid);box-shadow:0 0 0 3px #ffe8b824}.result{display:none;border-radius:var(--r-lg);padding:1px;box-shadow:var(--shadow-card);animation:rise .5s var(--ease)}.result.show{display:block}.result-in{border-radius:calc(var(--r-lg) - 1px);background:#181b21;padding:30px}.result.valid{background:linear-gradient(135deg,#e8ffc28c,#ffffff0d 55%,#96c85a4d)}.result.invalid{background:linear-gradient(135deg,#ff8c6e73,#ffffff0d 60%,#ff8c6e33)}.result.valid .result-in{background:radial-gradient(120% 70% at 50% -10%,rgba(232,255,194,.07),transparent 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