/* Harness Series — Shared Styles */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Pretendard Variable',Pretendard,-apple-system,BlinkMacSystemFont,sans-serif;background:#f8fafc;color:#1e293b;line-height:1.7}

nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,0.92);backdrop-filter:blur(20px);border-bottom:1px solid rgba(0,0,0,0.06)}
.nav-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 32px;height:56px}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:#1e293b;text-decoration:none}
.nav-logo img{height:26px}
.nav-links{display:flex;gap:2px}
.nav-links a{text-decoration:none;color:#64748b;font-size:0.78rem;font-weight:500;padding:6px 12px;border-radius:20px;transition:all 0.25s;white-space:nowrap}
.nav-links a:hover{color:#4f46e5;background:rgba(79,70,229,0.06)}
.nav-links a.active{color:#4f46e5;background:rgba(79,70,229,0.1);font-weight:600}

.hero{min-height:70vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#0f172a 0%,#1e1b4b 40%,#312e81 70%,#4338ca 100%);position:relative;overflow:hidden;padding:100px 32px 80px}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 20% 50%,rgba(99,102,241,0.15) 0%,transparent 50%),radial-gradient(circle at 80% 30%,rgba(139,92,246,0.12) 0%,transparent 40%)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,0.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,0.03) 1px,transparent 1px);background-size:60px 60px}
.hero-content{position:relative;z-index:2;max-width:750px;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);border-radius:24px;padding:8px 20px;margin-bottom:28px}
.hero-badge span{color:rgba(255,255,255,0.85);font-size:0.8rem;font-weight:500;letter-spacing:0.5px}
.hero-badge i{color:#a5b4fc;font-size:1rem}
.hero h1{font-size:clamp(1.8rem,4.5vw,2.8rem);font-weight:900;color:#fff;line-height:1.25;margin-bottom:18px}
.hero h1 .accent{background:linear-gradient(135deg,#a5b4fc,#c4b5fd,#e9d5ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-sub{color:rgba(255,255,255,0.6);font-size:1rem;line-height:1.7;max-width:560px;margin:0 auto}

.s{padding:80px 32px}
.s-inner{max-width:900px;margin:0 auto}
.s-label{display:inline-flex;align-items:center;gap:6px;color:#4f46e5;font-size:0.72rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:12px}
.s-title{font-size:clamp(1.4rem,3vw,1.9rem);font-weight:800;color:#0f172a;line-height:1.3;margin-bottom:14px}
.s-title .hl{color:#4f46e5}
.s-desc{color:#475569;font-size:1rem;line-height:1.8;margin-bottom:40px;text-align:justify}
.s-alt{background:#f1f5f9}
.s-dark{background:#0f172a}
.s-dark .s-label{color:#a5b4fc}
.s-dark .s-title{color:#f1f5f9}
.s-dark .s-title .hl{color:#a5b4fc}
.s-dark .s-desc{color:#94a3b8}

.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-bottom:36px}
.card{background:#fff;border-radius:16px;padding:28px 24px;border:1px solid #e2e8f0;transition:all 0.3s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 32px rgba(79,70,229,0.07);border-color:#c7d2fe}
.card-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:14px}
.card-icon.purple{background:#eef2ff;color:#4f46e5}
.card-icon.blue{background:#eff6ff;color:#2563eb}
.card-icon.green{background:#ecfdf5;color:#059669}
.card-icon.amber{background:#fffbeb;color:#d97706}
.card-icon.red{background:#fef2f2;color:#dc2626}
.card-icon.teal{background:#f0fdfa;color:#0d9488}
.card h3{font-size:1rem;font-weight:700;color:#0f172a;margin-bottom:8px}
.card p{color:#64748b;font-size:0.88rem;line-height:1.7;text-align:justify}

.diagram{background:#fff;border-radius:20px;padding:36px 32px;border:1px solid #e2e8f0;margin-bottom:36px}
.diagram h3{font-size:1rem;font-weight:700;color:#0f172a;text-align:center;margin-bottom:4px}
.diagram .sub{font-size:0.82rem;color:#64748b;text-align:center;margin-bottom:24px}
.flow{display:flex;align-items:center;justify-content:center;gap:0;flex-wrap:wrap}
.flow-node{text-align:center;padding:22px 18px;border-radius:14px;min-width:160px;flex:1}
.flow-node i{font-size:1.8rem;margin-bottom:8px;display:block}
.flow-node h4{font-size:0.9rem;font-weight:700;margin-bottom:3px}
.flow-node p{font-size:0.75rem;color:#64748b;line-height:1.4}
.flow-node.n1{background:#eef2ff;color:#4338ca}
.flow-node.n2{background:#ecfdf5;color:#047857}
.flow-node.n3{background:#fef3c7;color:#b45309}
.flow-arr{font-size:1.4rem;color:#cbd5e1;padding:0 6px}

.steps{margin-bottom:36px}
.step{display:flex;gap:20px;padding-bottom:28px;position:relative}
.step:last-child{padding-bottom:0}
.step-marker{width:36px;height:36px;border-radius:50%;background:#eef2ff;display:flex;align-items:center;justify-content:center;flex-shrink:0;position:relative;z-index:1;font-size:0.85rem;font-weight:800;color:#4f46e5}
.step:not(:last-child)::before{content:'';position:absolute;left:17px;top:40px;width:2px;height:calc(100% - 40px);background:#e2e8f0}
.step-body h4{font-size:0.95rem;font-weight:700;color:#0f172a;margin-bottom:4px}
.step-body p{color:#64748b;font-size:0.88rem;line-height:1.7;text-align:justify}

.tbl-wrap{background:#fff;border-radius:16px;padding:32px;border:1px solid #e2e8f0;margin-bottom:36px;overflow-x:auto}
.tbl-wrap h3{font-size:1rem;font-weight:700;color:#0f172a;margin-bottom:16px}
.tbl{width:100%;border-collapse:collapse;font-size:0.85rem}
.tbl thead th{background:#f1f5f9;color:#334155;font-weight:700;padding:12px 14px;text-align:left;border-bottom:2px solid #e2e8f0;white-space:nowrap}
.tbl thead th:first-child{border-radius:8px 0 0 0}
.tbl thead th:last-child{border-radius:0 8px 0 0}
.tbl tbody td{padding:12px 14px;border-bottom:1px solid #f1f5f9;color:#475569;vertical-align:top}
.tbl tbody tr:hover{background:#fafbfe}
.tbl .lbl{font-weight:600;color:#0f172a;white-space:nowrap}
.tag-r{display:inline-block;background:#fef2f2;color:#dc2626;font-size:0.7rem;font-weight:600;padding:2px 8px;border-radius:4px}
.tag-g{display:inline-block;background:#ecfdf5;color:#059669;font-size:0.7rem;font-weight:600;padding:2px 8px;border-radius:4px}
.tag-b{display:inline-block;background:#eef2ff;color:#4338ca;font-size:0.7rem;font-weight:600;padding:2px 8px;border-radius:4px}
.tag-y{display:inline-block;background:#fffbeb;color:#b45309;font-size:0.7rem;font-weight:600;padding:2px 8px;border-radius:4px}

.s-dark .card{background:rgba(255,255,255,0.04);border-color:rgba(255,255,255,0.08)}
.s-dark .card:hover{background:rgba(255,255,255,0.07);border-color:rgba(99,102,241,0.3);box-shadow:0 8px 32px rgba(0,0,0,0.3)}
.s-dark .card h3{color:#f1f5f9}
.s-dark .card p{color:#94a3b8}
.s-dark .card-icon.purple{background:rgba(79,70,229,0.15);color:#a5b4fc}
.s-dark .card-icon.red{background:rgba(239,68,68,0.15);color:#fca5a5}
.s-dark .card-icon.amber{background:rgba(245,158,11,0.15);color:#fcd34d}
.s-dark .tbl-wrap{background:rgba(255,255,255,0.04);border-color:rgba(255,255,255,0.08)}
.s-dark .tbl-wrap h3{color:#f1f5f9}
.s-dark .tbl thead th{background:rgba(255,255,255,0.05);color:#94a3b8;border-color:rgba(255,255,255,0.1)}
.s-dark .tbl tbody td{color:#94a3b8;border-color:rgba(255,255,255,0.05)}
.s-dark .tbl tbody tr:hover{background:rgba(255,255,255,0.06)}
.s-dark .tbl .lbl{color:#f1f5f9}

.insight{background:linear-gradient(135deg,#eef2ff,#e0e7ff);border-left:4px solid #4f46e5;border-radius:0 14px 14px 0;padding:24px 28px;margin-bottom:36px}
.insight h4{color:#3730a3;font-size:0.9rem;font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.insight p{color:#4338ca;font-size:0.88rem;line-height:1.8;text-align:justify}
.insight-green{background:linear-gradient(135deg,#ecfdf5,#d1fae5);border-left-color:#059669}
.insight-green h4{color:#065f46}
.insight-green p{color:#047857}

.compare-wrap{margin-bottom:36px}
.compare-label{font-size:0.92rem;font-weight:700;color:#0f172a;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.compare-label i{color:#4f46e5}
.s-dark .compare-label{color:#f1f5f9}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.compare-col{border-radius:16px;padding:28px 24px}
.compare-col.bad{background:#fef2f2;border:1px solid #fecaca}
.compare-col.good{background:#ecfdf5;border:1px solid #a7f3d0}
.compare-col .col-tag{display:inline-flex;align-items:center;gap:4px;font-size:0.72rem;font-weight:700;padding:3px 10px;border-radius:6px;margin-bottom:14px}
.compare-col.bad .col-tag{background:#fee2e2;color:#dc2626}
.compare-col.good .col-tag{background:#d1fae5;color:#059669}
.compare-col h4{font-size:0.9rem;font-weight:700;margin-bottom:10px}
.compare-col.bad h4{color:#991b1b}
.compare-col.good h4{color:#065f46}
.compare-col .chat{background:rgba(255,255,255,0.7);border-radius:10px;padding:14px 16px;margin-bottom:10px;font-size:0.82rem;line-height:1.6}
.compare-col.bad .chat{color:#7f1d1d;border-left:3px solid #fca5a5}
.compare-col.good .chat{color:#14532d;border-left:3px solid #6ee7b7}
.compare-col .chat .q{font-weight:700;margin-bottom:6px}
.compare-col .verdict{font-size:0.78rem;font-weight:600;margin-top:8px;display:flex;align-items:center;gap:4px}
.compare-col.bad .verdict{color:#dc2626}
.compare-col.good .verdict{color:#059669}

.sub-label{font-size:1.1rem;font-weight:700;color:#0f172a;margin-bottom:20px;display:flex;align-items:center;gap:10px}
.sub-num{background:#eef2ff;color:#4f46e5;padding:4px 10px;border-radius:6px;font-size:0.75rem;font-weight:800}

.tool-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:20px;margin-bottom:36px}
.tool{background:#fff;border-radius:16px;padding:28px 24px;border:1px solid #e2e8f0;transition:all 0.3s}
.tool:hover{transform:translateY(-3px);box-shadow:0 8px 32px rgba(79,70,229,0.07);border-color:#c7d2fe}
.tool-top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.tool-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}
.tool-top h4{font-size:0.95rem;font-weight:700;color:#0f172a}
.tool-top .tool-cat{font-size:0.7rem;color:#64748b;font-weight:500}
.tool p{color:#64748b;font-size:0.85rem;line-height:1.6;text-align:justify;margin-bottom:12px}
.tool-tags{display:flex;gap:6px;flex-wrap:wrap}
.tool-tag{font-size:0.7rem;font-weight:600;padding:3px 10px;border-radius:6px}

.roadmap{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:36px}
.rm-phase{background:#fff;border-radius:16px;padding:24px 20px;border:1px solid #e2e8f0;text-align:center;position:relative;transition:all 0.3s}
.rm-phase:hover{border-color:#c7d2fe;box-shadow:0 8px 24px rgba(79,70,229,0.06)}
.rm-phase::after{content:'→';position:absolute;right:-14px;top:50%;transform:translateY(-50%);color:#cbd5e1;font-size:1.2rem;font-weight:700}
.rm-phase:last-child::after{display:none}
.rm-week{font-size:0.7rem;font-weight:700;color:#4f46e5;letter-spacing:1px;margin-bottom:8px}
.rm-phase h4{font-size:0.88rem;font-weight:700;color:#0f172a;margin-bottom:6px}
.rm-phase p{font-size:0.78rem;color:#64748b;line-height:1.5}
.rm-phase .rm-icon{width:40px;height:40px;border-radius:10px;background:#eef2ff;color:#4f46e5;font-size:1.2rem;display:flex;align-items:center;justify-content:center;margin:0 auto 12px}

.checklist{background:#fff;border-radius:16px;padding:32px;border:1px solid #e2e8f0;margin-bottom:20px}
.checklist h3{font-size:1rem;font-weight:700;color:#0f172a;margin-bottom:16px;display:flex;align-items:center;gap:8px}
.checklist h3 i{color:#4f46e5}
.check-item{display:flex;align-items:flex-start;gap:10px;padding:10px 0;border-bottom:1px solid #f1f5f9}
.check-item:last-child{border-bottom:none}
.check-item i{color:#4f46e5;font-size:1rem;margin-top:2px;flex-shrink:0}
.check-item span{font-size:0.88rem;color:#334155;line-height:1.6}

/* Chapter Nav */
.ch-nav{display:flex;justify-content:space-between;align-items:center;padding:40px 32px;max-width:900px;margin:0 auto;gap:16px}
.ch-nav a{display:flex;align-items:center;gap:8px;text-decoration:none;font-size:0.88rem;font-weight:600;color:#4f46e5;padding:12px 20px;border-radius:12px;border:1px solid #e2e8f0;background:#fff;transition:all 0.3s}
.ch-nav a:hover{background:#eef2ff;border-color:#c7d2fe;transform:translateY(-1px)}
.ch-nav .spacer{flex:1}

.source-bar{background:#f1f5f9;padding:20px 32px;text-align:center}
.source-bar p{font-size:0.78rem;color:#94a3b8;max-width:700px;margin:0 auto}
.source-bar a{color:#6366f1;text-decoration:none}
.source-bar a:hover{text-decoration:underline}

/* Lock overlay */
.lock-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(15,23,42,.97);z-index:9999;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(12px)}
.lock-box{text-align:center;max-width:380px;padding:48px 36px;background:rgba(30,41,59,.8);border:1px solid rgba(99,102,241,.25);border-radius:24px;box-shadow:0 24px 64px rgba(0,0,0,.4)}
.lock-box i.lock-icon{font-size:3.2rem;color:#818cf8;margin-bottom:16px;display:block}
.lock-box h2{font-size:1.3rem;font-weight:800;color:#e2e8f0;margin-bottom:8px}
.lock-box p{font-size:.88rem;color:#94a3b8;line-height:1.6;margin-bottom:24px}
.lock-input{width:100%;padding:14px 18px;border:1.5px solid rgba(99,102,241,.3);border-radius:12px;background:rgba(15,23,42,.6);color:#e2e8f0;font-size:1.1rem;font-family:inherit;text-align:center;letter-spacing:8px;outline:none;transition:border-color .2s}
.lock-input:focus{border-color:#6366f1}
.lock-input.shake{animation:lockShake .4s}
.lock-submit{margin-top:16px;width:100%;padding:14px;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;border:none;border-radius:12px;font-size:.95rem;font-weight:700;cursor:pointer;font-family:inherit;transition:transform .2s,box-shadow .2s}
.lock-submit:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(79,70,229,.4)}
.lock-error{color:#f87171;font-size:.82rem;margin-top:10px;min-height:1.2em}
@keyframes lockShake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}

/* Quiz */
.quiz-container{display:flex;flex-direction:column;gap:24px;margin-top:32px}
.quiz-card{background:#fff;border:1px solid #e5e7eb;border-radius:16px;padding:28px;transition:border-color .3s}
.quiz-card.answered{pointer-events:none}
.quiz-card.correct{border-color:#22c55e;background:#f0fdf4}
.quiz-card.wrong{border-color:#ef4444;background:#fef2f2}
.quiz-num{display:inline-block;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;font-size:.72rem;font-weight:800;padding:4px 12px;border-radius:20px;margin-bottom:12px}
.quiz-q{font-size:1.05rem;font-weight:700;color:#1e293b;line-height:1.6;margin-bottom:16px}
.quiz-options{display:flex;flex-direction:column;gap:10px}
.quiz-opt{background:#f8fafc;border:1.5px solid #e2e8f0;border-radius:10px;padding:12px 16px;text-align:left;font-size:.92rem;color:#334155;cursor:pointer;transition:all .2s;font-family:inherit;line-height:1.5}
.quiz-opt:hover{border-color:#4f46e5;background:#eef2ff;color:#4f46e5}
.quiz-opt.selected-correct{border-color:#22c55e;background:#dcfce7;color:#15803d;font-weight:600}
.quiz-opt.selected-wrong{border-color:#ef4444;background:#fee2e2;color:#dc2626;font-weight:600}
.quiz-opt.show-correct{border-color:#22c55e;background:#f0fdf4;color:#15803d}
.quiz-explain{display:none;margin-top:16px;padding:16px;background:#f0f9ff;border-left:3px solid #4f46e5;border-radius:0 10px 10px 0;font-size:.88rem;color:#475569;line-height:1.7}
.quiz-explain.show{display:block;animation:fadeIn .3s}
.quiz-score{text-align:center;padding:40px 24px;background:linear-gradient(135deg,#eef2ff,#faf5ff);border-radius:20px;margin-top:32px}
.score-icon{font-size:3rem;color:#4f46e5;margin-bottom:12px}
.score-text{font-size:2rem;font-weight:800;color:#1e293b}
.score-text span{color:#4f46e5}
.score-msg{margin-top:12px;font-size:1rem;color:#64748b;line-height:1.6}
.score-retry{margin-top:20px;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;border:none;padding:12px 28px;border-radius:10px;font-size:.92rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;font-family:inherit}
.score-retry:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(79,70,229,.3)}
@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

@media(max-width:768px){
    .nav-links{display:none}
    .hero{padding:100px 20px 60px;min-height:auto}
    .hero h1{font-size:1.7rem}
    .s{padding:60px 20px}
    .card-grid,.tool-grid{grid-template-columns:1fr}
    .compare{grid-template-columns:1fr}
    .flow{flex-direction:column;gap:8px}
    .flow-arr{transform:rotate(90deg)}
    .roadmap{grid-template-columns:1fr 1fr}
    .rm-phase::after{display:none}
    .tbl-wrap{padding:16px}
    .ch-nav{flex-wrap:wrap}
}
@media(max-width:480px){.roadmap{grid-template-columns:1fr}}