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:root{--bg:#f6f7f9;--card:#fff;--border:#e6e9ec;--text:#1b1b1b;--muted:#6b7580;--dark:#1a1e26;--dark-2:#2c3540;--accent:#007a4a;--accent-bright:#01ae6a}*{box-sizing:border-box}html,body{height:100%}body{background:var(--bg);color:var(--text);margin:0;line-height:1.55}a{color:inherit;text-decoration:none}.container{max-width:1020px;margin:0 auto;padding:2rem 1.25rem}.navbar{background:var(--dark-2);color:#fff}.navbar .inner{justify-content:space-between;align-items:center;gap:1rem;max-width:1020px;margin:0 auto;padding:.8rem 1.25rem;display:flex}.navbar img{width:auto;height:44px;display:block}.navbar .who{color:#b8c2cc;text-overflow:ellipsis;white-space:nowrap;font-size:.8rem;overflow:hidden}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:1.4rem;box-shadow:0 1px 3px #1a1e260d}.muted{color:var(--muted)}.btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:.8rem 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.4rem;font-size:1.55rem;font-weight:800}.login-box .lead{color:var(--muted);margin:0 0 1.5rem}.login-box .hint{color:var(--muted);margin-top:1.4rem;font-size:.8rem}.login-box .hint a{color:var(--accent);font-weight:600}.sent-box{border:1px solid var(--border);border-left:4px solid var(--accent-bright);background:#fff;border-radius:12px;padding:1.1rem 1.2rem}@media (max-width:880px){.login-shell{grid-template-columns:1fr}.login-hero{padding:2.2rem 1.5rem}.login-hero h2{font-size:1.5rem}.login-hero .foot{display:none}}.course-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.1rem;margin-top:1.3rem;display:grid}.course-card{border:1px solid var(--border);background:var(--card);border-radius:14px;flex-direction:column;gap:.5rem;padding:1.4rem;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex;box-shadow:0 1px 3px #1a1e260d}.course-card:hover{border-color:var(--accent-bright);transform:translateY(-3px);box-shadow:0 10px 28px #1a1e261f}.course-card 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input[type=text]:focus{border-color:var(--accent-bright);outline:none;box-shadow:0 0 0 3px #01ae6a2e}.promo-btn{font:inherit;color:#007a4a;cursor:pointer;background:#fff;border:1px solid #007a4a;border-radius:4px;flex:none;padding:0 22px;font-size:15px;font-weight:600}.promo-btn:disabled{opacity:.5;cursor:default}.course-nav li a.locked{color:var(--muted)}.course-nav li a.locked .ic{color:var(--muted);font-size:.8rem}.lesson-locked{text-align:center;padding:2.4rem 1.6rem}.lesson-locked-icon{margin:0 0 .4rem;font-size:2.2rem}.lesson-locked h2{margin:0 0 .6rem;font-size:1.25rem}.lesson-locked p{max-width:520px;color:var(--muted);margin:0 auto 1.2rem}.course-card .tag-free{color:#b7791f;background:#d69e2e24}.trial-banner{border-left:4px solid var(--accent);margin-bottom:1.2rem}.trial-banner p{margin:0}.trial-promo{border:1px dashed var(--accent);background:#01ae6a1a;border-radius:8px;padding:.7rem 1rem;margin-top:.8rem!important}.lesson-locked .trial-promo{max-width:520px;margin:.4rem auto 1.2rem!important}.player-wm{z-index:2;color:#ffffff8c;pointer-events:none;-webkit-user-select:none;user-select:none;background:#00000040;border-radius:4px;padding:.15rem .5rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.72rem;transition:top .6s,bottom .6s,left .6s,right .6s;position:absolute}.player-wm-tl{top:8%;left:3%}.player-wm-tr{top:8%;right:3%}.player-wm-br{bottom:14%;right:3%}.player-wm-bl{bottom:14%;left:3%}.nf{background:radial-gradient(1200px 700px at 15% -10%, #2c3540 0%, var(--dark) 55%);color:#fff;text-align:center;justify-content:center;align-items:center;min-height:100vh;padding:2rem 1.25rem;display:flex;position:relative;overflow:hidden}.nf-box{z-index:1;max-width:560px;position:relative}.nf-logo{width:auto;height:56px;margin-bottom:1.4rem}.nf-chart svg{max-width:100%;height:auto}.nf-candles line{stroke:#ffffff8c;stroke-width:2px}.nf-candles rect{rx:2}.nf-candles .up{fill:var(--accent-bright)}.nf-candles .dn{fill:#d01a31}.nf-q{fill:#d01a31;font-size:34px;font-weight:800}.nf-code{letter-spacing:-.04em;background:linear-gradient(90deg, var(--accent-bright), #fff);color:#0000;-webkit-background-clip:text;background-clip:text;margin:.4rem 0 0;font-size:5rem;font-weight:800;line-height:1}.nf h1{margin:.4rem 0 .8rem;font-size:1.6rem;font-weight:700}.nf-lead{color:#ffffffbf;max-width:460px;margin:0 auto 1.6rem}.nf-actions{flex-wrap:wrap;justify-content:center;gap:.7rem;display:flex}.nf-ghost{color:#fff;background:0 0;border:1px solid #ffffff59}.nf-ghost:hover{border-color:var(--accent-bright);color:var(--accent-bright)}.nf-help{color:#fff9;margin-top:1.8rem;font-size:.85rem}.nf-help a{color:var(--accent-bright)}@media (max-width:560px){.nf-code{font-size:3.6rem}.nf h1{font-size:1.3rem}}