.stage-hero{border-bottom:1px solid var(--c-border);padding:88px 48px 64px;position:relative;overflow:hidden}.stage-hero:before{content:"";background:radial-gradient(ellipse 65% 60% at 10% 60%, var(--c-accent-glow) 0%, transparent 65%), radial-gradient(ellipse 45% 45% at 85% 15%, var(--c-accent-dim) 0%, transparent 55%);pointer-events:none;position:absolute;inset:0}.stage-hero:after{content:"";background-image:linear-gradient(var(--c-border) 1px, transparent 1px), linear-gradient(90deg, var(--c-border) 1px, transparent 1px);opacity:.07;pointer-events:none;background-size:44px 44px;position:absolute;inset:0}.stage-hero__inner{z-index:1;max-width:900px;margin:0 auto;position:relative}.stage-hero__breadcrumb{font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;color:var(--c-text-3);align-items:center;gap:8px;margin-bottom:20px;font-size:.72rem;font-weight:600;display:flex}.stage-hero__breadcrumb a{color:var(--c-text-3);transition:color .15s}.stage-hero__breadcrumb a:hover{color:var(--c-accent);opacity:1}.stage-hero__breadcrumb span{color:var(--c-accent)}.stage-hero__level-badge{font-family:var(--font-display);letter-spacing:.12em;text-transform:uppercase;color:var(--c-accent);background:var(--c-accent-dim);border:1px solid var(--c-accent-glow);border-radius:9999px;align-items:center;gap:8px;margin-bottom:20px;padding:6px 14px;font-size:.7rem;font-weight:700;display:inline-flex}.stage-hero__level-icon{font-size:1rem}.stage-hero__title{font-family:var(--font-display);letter-spacing:-.025em;color:var(--c-text);margin-bottom:12px;font-size:clamp(2.4rem,5vw,4rem);font-weight:800;line-height:1.08}.stage-hero__title em{font-style:italic;font-family:var(--font-body);color:var(--c-accent);font-weight:400}.stage-hero__desc{color:var(--c-text-2);max-width:580px;margin-bottom:28px;font-size:1.05rem;line-height:1.65}.stage-hero__meta{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.stage-hero__tag{font-family:var(--font-display);letter-spacing:.1em;text-transform:uppercase;color:var(--c-tag-text);background:var(--c-tag-bg);border:1px solid var(--c-accent-glow);border-radius:9999px;padding:4px 12px;font-size:.68rem;font-weight:700}.stage-nav{border-bottom:1px solid var(--c-border);justify-content:space-between;align-items:center;max-width:900px;margin:0 auto;padding:20px 48px;display:flex}.stage-nav__steps{align-items:center;gap:0;display:flex}.stage-nav__step{align-items:center;display:flex}.stage-nav__step-btn{font-family:var(--font-display);letter-spacing:.06em;text-transform:uppercase;color:var(--c-text-3);cursor:pointer;border:1px solid #0000;border-radius:9999px;align-items:center;gap:8px;padding:7px 14px;font-size:.72rem;font-weight:700;text-decoration:none;transition:all .18s;display:flex}.stage-nav__step-btn:hover{color:var(--c-text-2);background:var(--c-bg-3);opacity:1}.stage-nav__step-btn.active{color:var(--c-accent);background:var(--c-accent-dim);border-color:var(--c-accent-glow)}.stage-nav__step-icon{font-size:.9rem}.stage-nav__sep{background:linear-gradient(90deg, var(--c-border-2), var(--c-border));width:32px;height:1px;margin:0 2px}.stage-body{max-width:900px;margin:0 auto;padding:56px 48px 96px}.stage-service{margin-bottom:64px;animation:.4s both fadeUp}@keyframes fadeUp{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.stage-service:first-child{animation-delay:50ms}.stage-service:nth-child(2){animation-delay:.1s}.stage-service:nth-child(3){animation-delay:.15s}.stage-service:nth-child(4){animation-delay:.2s}.stage-service:nth-child(5){animation-delay:.25s}.stage-service:nth-child(6){animation-delay:.3s}.stage-service__header{border-bottom:1px solid var(--c-border);align-items:center;gap:14px;margin-bottom:20px;padding-bottom:16px;display:flex}.stage-service__icon{background:var(--c-accent-dim);border:1px solid var(--c-accent-glow);border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;font-size:1.2rem;display:flex}.stage-service__title{font-family:var(--font-display);letter-spacing:-.01em;color:var(--c-text);font-size:1.2rem;font-weight:700}.stage-service__count{font-family:var(--font-mono);color:var(--c-accent);background:var(--c-accent-dim);border:1px solid var(--c-accent-glow);white-space:nowrap;border-radius:9999px;margin-left:auto;padding:2px 10px;font-size:.65rem;font-weight:500}.stage-topics{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;display:grid}.stage-topic{background:var(--c-surface);border:1px solid var(--c-border);cursor:pointer;border-radius:12px;align-items:flex-start;gap:12px;padding:16px;text-decoration:none;transition:all .22s cubic-bezier(.34,1.56,.64,1);display:flex;position:relative;overflow:hidden}.stage-topic:before{content:"";background:linear-gradient(90deg, var(--c-accent), transparent);opacity:0;height:2px;transition:opacity .2s;position:absolute;top:0;left:0;right:0}.stage-topic:hover{border-color:var(--c-accent-glow);box-shadow:0 6px 24px #00000059, 0 0 32px var(--c-accent-dim);transform:translateY(-2px)}.stage-topic:hover:before{opacity:1}.stage-topic__num{font-family:var(--font-mono);color:var(--c-accent);background:var(--c-accent-dim);border:1px solid var(--c-accent-glow);border-radius:4px;flex-shrink:0;margin-top:1px;padding:2px 7px;font-size:.62rem;font-weight:500}.stage-topic__body{flex:1;min-width:0}.stage-topic__title{font-family:var(--font-display);color:var(--c-text);margin-bottom:4px;font-size:.875rem;font-weight:600;line-height:1.4}.stage-topic__sub{font-family:var(--font-display);color:var(--c-text-3);font-size:.72rem;line-height:1.4}.stage-topic__arrow{color:var(--c-text-3);flex-shrink:0;margin-top:2px;font-size:.8rem;transition:all .18s}.stage-topic:hover .stage-topic__arrow{color:var(--c-accent);transform:translate(3px)}.stage-topic__diff{font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;border-radius:9999px;align-items:center;margin-top:6px;padding:2px 7px;font-size:.6rem;font-weight:700;display:inline-flex}.diff-easy{color:#4ade80;background:#22c55e1a;border:1px solid #22c55e40}.diff-medium{color:#fbbf24;background:#f59e0b1a;border:1px solid #f59e0b40}.diff-hard{color:#f87171;background:#ef44441a;border:1px solid #ef444433}.stage-progress-bar{background:var(--c-bg-3);border-radius:9999px;height:4px;margin-bottom:32px;overflow:hidden}.stage-progress-bar__fill{background:linear-gradient(90deg, var(--c-accent), var(--c-tag-text));border-radius:9999px;height:100%;transition:width .6s}.stage-cta{background:var(--c-surface);border:1px solid var(--c-border);text-align:center;border-radius:20px;margin-top:64px;padding:40px;position:relative;overflow:hidden}.stage-cta:before{content:"";background:radial-gradient(ellipse at center, var(--c-accent-dim) 0%, transparent 70%);pointer-events:none;position:absolute;inset:0}.stage-cta__title{font-family:var(--font-display);color:var(--c-text);margin-bottom:8px;font-size:1.4rem;font-weight:800;position:relative}.stage-cta__desc{font-family:var(--font-display);color:var(--c-text-3);margin-bottom:24px;font-size:.88rem;position:relative}.stage-cta__btn{font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;color:var(--c-bg);background:var(--c-accent);box-shadow:0 4px 20px var(--c-accent-glow);border-radius:9999px;align-items:center;gap:8px;padding:12px 28px;font-size:.8rem;font-weight:700;text-decoration:none;transition:all .22s;display:inline-flex;position:relative}.stage-cta__btn:hover{box-shadow:0 8px 32px var(--c-accent-glow);opacity:1;transform:translateY(-2px)}@media (max-width:768px){.stage-hero{padding:56px 24px 40px}.stage-body{padding:40px 24px 64px}.stage-nav{flex-direction:column;gap:16px;padding:16px 24px}.stage-topics{grid-template-columns:1fr}.stage-nav__steps{flex-wrap:wrap;justify-content:center;gap:4px}.stage-nav__sep{display:none}}.topic-container{max-width:800px;margin:0 auto;padding:48px 24px 80px}.topic-breadcrumb{font-family:var(--font-display);letter-spacing:.08em;text-transform:uppercase;color:var(--c-text-3);align-items:center;gap:8px;margin-bottom:32px;font-size:.72rem;font-weight:600;display:flex}.topic-breadcrumb a{color:var(--c-text-3);transition:color .15s}.topic-breadcrumb a:hover{color:var(--c-accent);opacity:1}.topic-content{font-family:var(--font-body);color:var(--c-text-2);font-size:1rem;line-height:1.7}.topic-content h1{font-family:var(--font-display);color:var(--c-text-1);margin-bottom:24px;font-size:2.5rem;font-weight:700;line-height:1.2}.topic-content h2{font-family:var(--font-display);color:var(--c-text-1);border-top:1px solid var(--c-border);margin:40px 0 16px;padding-top:24px;font-size:1.5rem;font-weight:600}.topic-content h3{font-family:var(--font-display);color:var(--c-text-1);margin:32px 0 12px;font-size:1.15rem;font-weight:600}.topic-content p{margin-bottom:16px}.topic-content ul,.topic-content ol{margin:16px 0;padding-left:24px}.topic-content li{margin-bottom:8px}.topic-content code{font-family:var(--font-mono);background:var(--c-bg-2);border-radius:4px;padding:2px 6px;font-size:.875em}.topic-content pre{background:var(--c-bg-2);font-family:var(--font-mono);white-space:pre;text-align:left;border-radius:8px;margin:16px 0;padding:16px;font-size:.8rem;line-height:1.5;overflow-x:auto}.topic-content pre code{background:0 0;padding:0;font-family:inherit}.topic-content table{border-collapse:collapse;width:100%;margin:16px 0}.topic-content th,.topic-content td{border:1px solid var(--c-border);text-align:left;padding:12px}.topic-content th{background:var(--c-bg-2);font-weight:600}.topic-content blockquote{border-left:3px solid var(--c-accent);color:var(--c-text-3);margin:16px 0;padding-left:16px}.topic-content hr{border:none;border-top:1px solid var(--c-border);margin:32px 0}.topic-nav{border-top:1px solid var(--c-border);justify-content:space-between;margin-top:48px;padding-top:24px;display:flex}.topic-nav-btn{background:var(--c-bg-2);border:1px solid var(--c-border);font-family:var(--font-display);color:var(--c-text-2);border-radius:8px;align-items:center;padding:12px 20px;font-size:.875rem;font-weight:500;text-decoration:none;transition:all .15s;display:inline-flex}.topic-nav-btn:hover{background:var(--c-accent-dim);border-color:var(--c-accent);color:var(--c-accent)}.topic-loading,.topic-error{text-align:center;font-family:var(--font-body);color:var(--c-text-3);padding:80px 24px}.topic-error{color:#ef4444}@media (max-width:768px){.topic-container{padding:32px 16px 64px}.topic-content h1{font-size:1.75rem}.topic-content h2{font-size:1.25rem}}