*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#2da3d9;--primary-dark:#2090bc;--subject-a:#282867;--subject-b:#38a169;--text:#282867;--text-light:#414041;--bg:#feffff;--surface:#fff;--border:#d8dae8;--radius:6px;--shadow:0 1px 4px #00000014;--nav-height:60px;--color-accent:var(--primary);--color-border:var(--border);--color-bg:var(--bg);--color-text:var(--text);--color-text-secondary:var(--text-light);--color-surface:var(--surface)}body{background:var(--bg);color:var(--text);font-family:Hiragino Kaku Gothic ProN,Noto Sans JP,Meiryo,sans-serif;font-size:16px;line-height:1.7}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.navbar{z-index:100;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;box-shadow:0 1px 6px #0000000f}.navbar-inner{max-width:1200px;height:var(--nav-height);align-items:center;gap:16px;margin:0 auto;padding:0 20px;display:flex}.navbar-brand{color:var(--text);white-space:nowrap;flex-shrink:0;align-items:center;gap:8px;font-size:15px;font-weight:700;text-decoration:none;display:flex}.brand-icon{font-size:20px}.nav-desktop{align-items:center;gap:8px;margin-left:auto;display:flex}.dropdown-wrap{position:relative}.dropdown-trigger{border:1px solid var(--border);cursor:pointer;color:var(--text-light);white-space:nowrap;background:0 0;border-radius:8px;align-items:center;gap:6px;padding:6px 12px;font-size:13px;font-weight:600;transition:background .15s,border-color .15s;display:flex}.dropdown-trigger:hover{background:var(--bg);border-color:var(--primary)}.dropdown-trigger.active{color:var(--primary);border-color:var(--primary);background:#2da3d90d}.dropdown-trigger.open{background:var(--bg);border-color:var(--primary)}.dropdown-arrow{color:var(--text-light);font-size:10px}.dropdown-menu{background:var(--surface);border:1px solid var(--border);z-index:200;border-radius:10px;min-width:200px;padding:6px;position:absolute;top:calc(100% + 6px);left:0;box-shadow:0 8px 24px #0000001f}.dropdown-item{color:var(--text);white-space:nowrap;border-radius:6px;align-items:center;gap:8px;padding:8px 10px;font-size:13px;text-decoration:none;transition:background .12s;display:flex}.dropdown-item:hover{background:var(--bg);text-decoration:none}.dropdown-item.active{color:var(--primary);background:#2da3d914;font-weight:600}.dropdown-num{background:var(--border);width:20px;height:20px;color:var(--text-light);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:inline-flex}.dropdown-item.active .dropdown-num{background:var(--primary);color:#fff}.hamburger{cursor:pointer;background:0 0;border:none;flex-direction:column;gap:5px;margin-left:auto;padding:6px;display:none}.hamburger span{background:var(--text);border-radius:2px;width:22px;height:2px;display:block}.mobile-menu{background:var(--surface);border-top:1px solid var(--border);gap:24px;padding:12px 20px 16px;display:flex;box-shadow:0 4px 12px #00000014}.mobile-section{flex:1}.mobile-section-label{border-radius:4px;margin-bottom:8px;padding:3px 8px;font-size:11px;font-weight:800;display:inline-block}.mobile-section-label.subject-a{color:var(--subject-a);background:#2828671a}.mobile-section-label.subject-b{color:var(--subject-b);background:#48bb781f}.mobile-link{color:var(--text-light);border-radius:6px;align-items:center;gap:8px;padding:7px 6px;font-size:13px;text-decoration:none;transition:background .12s;display:flex}.mobile-link:hover{background:var(--bg);color:var(--text);text-decoration:none}.mobile-link.active{color:var(--primary);background:#2da3d912;font-weight:600}.mobile-num{background:var(--border);width:18px;height:18px;color:var(--text-light);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:10px;font-weight:700;display:inline-flex}@media (max-width:700px){.nav-desktop{display:none}.hamburger{display:flex}.mobile-menu{flex-direction:column;gap:12px}}@media (min-width:701px){.hamburger{display:none}.mobile-menu{display:none!important}}.page-wrapper{max-width:1200px;margin:0 auto;padding:0 20px 60px}.site-footer{color:#fff9;text-align:center;background:#282867;margin-top:40px;padding:24px 20px;font-size:13px}.site-footer-inner{flex-direction:column;align-items:center;gap:8px;display:flex}.site-footer-name{color:#ffffffd9;font-weight:500}.site-footer-notice{color:#ffffff73;max-width:560px;font-size:11px;line-height:1.6}.site-footer-links{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;display:flex}.site-footer-links a{color:#2da3d9;text-decoration:none}.site-footer-links a:hover{text-decoration:underline}.site-footer-links span{color:#ffffff4d}.disclaimer-page{max-width:760px;margin:0 auto;padding:40px 20px 80px}.disclaimer-inner{flex-direction:column;gap:0;display:flex}.disclaimer-h1{margin-bottom:6px;font-size:24px;font-weight:700}.disclaimer-updated{color:var(--text-light);margin-bottom:36px;font-size:13px}.disclaimer-section{margin-bottom:32px}.disclaimer-section h2{border-bottom:1px solid var(--border);margin-bottom:10px;padding-bottom:6px;font-size:16px;font-weight:700}.disclaimer-section p{color:var(--text);margin-bottom:10px;font-size:14px;line-height:1.8}.disclaimer-section ul{color:var(--text);margin-bottom:10px;padding-left:20px;font-size:14px;line-height:1.8}.disclaimer-section ul li{margin-bottom:4px}.disclaimer-section a{color:var(--primary)}.disclaimer-footer-nav{border-top:1px solid var(--border);margin-top:16px;padding-top:24px}.btn-back-home{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:8px;align-items:center;gap:6px;padding:10px 20px;font-size:14px;text-decoration:none;transition:background .15s;display:inline-flex}.btn-back-home:hover{background:var(--border)}.chapter-disclaimer-bar{color:var(--text-light);background:var(--surface);border:1px solid var(--border);border-radius:6px;flex-wrap:wrap;align-items:center;gap:6px;margin-bottom:16px;padding:6px 12px;font-size:11px;display:flex}.chapter-disclaimer-link{color:var(--primary);white-space:nowrap;flex-shrink:0;text-decoration:none}.chapter-disclaimer-link:hover{text-decoration:underline}.hero{justify-content:space-between;align-items:center;gap:40px;padding:60px 0 48px;display:flex}.hero-title{color:var(--text);margin-bottom:12px;font-size:clamp(24px,4vw,40px);font-weight:800;line-height:1.2}.hero-subtitle{color:var(--text-light);margin-bottom:20px;font-size:17px}.hero-badges{flex-wrap:wrap;gap:8px;margin-bottom:28px;display:flex}.badge{border-radius:20px;padding:4px 12px;font-size:12px;font-weight:600}.badge-a{color:var(--subject-a);background:#28286714;border:1px solid #28286740}.badge-b{color:var(--subject-b);background:#48bb781f;border:1px solid #48bb784d}.badge-q{color:#c05621;background:#ed89361f;border:1px solid #ed89364d}.btn-start{background:var(--primary);color:#fff;border-radius:6px;padding:12px 28px;font-size:16px;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .15s,background .15s;display:inline-block;box-shadow:0 3px 10px #2da3d959}.btn-start:hover{background:var(--primary-dark);text-decoration:none;transform:translateY(-1px);box-shadow:0 5px 14px #2da3d966}.subject-section{margin-bottom:48px}.section-heading{align-items:center;gap:10px;margin-bottom:8px;font-size:20px;font-weight:700;display:flex}.section-desc{color:var(--text-light);margin-bottom:20px;font-size:14px}.subject-tag{letter-spacing:.5px;border-radius:5px;padding:3px 9px;font-size:11px;font-weight:800}.subject-tag.subject-a{color:var(--subject-a);background:#2828671f}.subject-tag.subject-b{color:var(--subject-b);background:#48bb7826}.chapter-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;display:grid}.chapter-card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);color:var(--text);border-top:4px solid #0000;flex-direction:column;padding:20px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:flex}.chapter-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:0 6px 20px #0000001f}.chapter-card-a{border-top-color:var(--subject-a)}.chapter-card-b{border-top-color:var(--subject-b)}.chapter-num{color:var(--text-light);margin-bottom:6px;font-size:12px}.chapter-card-title{margin-bottom:8px;font-size:16px;font-weight:700}.chapter-card-desc{color:var(--text-light);flex:1;font-size:13px;line-height:1.5}.chapter-card-footer{color:var(--text-light);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px;margin-top:16px;font-size:13px;display:flex}.chapter-est-time{color:var(--text-light);opacity:.75;white-space:nowrap;font-size:11px}.arrow{color:var(--primary);font-size:16px}.chapter-difficulty-row{align-items:center;gap:6px;margin-top:8px;display:flex}.chapter-difficulty-dots{align-items:center;gap:3px;display:flex}.chapter-difficulty-dot{background:var(--color-border,#e2e8f0);border-radius:50%;width:8px;height:8px;transition:background .2s;display:inline-block}.chapter-difficulty-label{color:var(--text-light);letter-spacing:.02em;font-size:11px;font-weight:600}.features-section{background:var(--surface);box-shadow:var(--shadow);border-radius:16px;margin-top:48px;padding:40px}.features-section h2{text-align:center;margin-bottom:24px;font-size:20px;font-weight:700}.features-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;display:grid}.feature-card{text-align:center}.feature-icon{margin-bottom:10px;font-size:36px;display:block}.feature-card h3{margin-bottom:6px;font-size:15px;font-weight:700}.feature-card p{color:var(--text-light);font-size:13px}.chapter-page{min-height:calc(100vh - var(--nav-height));grid-template-columns:240px 1fr;gap:32px;padding-top:28px;display:grid}.chapter-sidebar{top:calc(var(--nav-height) + 16px);max-height:calc(100vh - var(--nav-height) - 32px);background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);align-self:start;padding:20px 0;position:sticky;overflow-y:auto}.sidebar-header{border-bottom:1px solid var(--border);padding:0 16px 16px;position:relative}.sidebar-title{margin-top:8px;font-size:15px;font-weight:700;line-height:1.4}.section-nav{padding:12px 0}.section-nav-btn{text-align:left;width:100%;color:var(--text-light);cursor:pointer;background:0 0;border:none;align-items:center;gap:10px;padding:10px 16px;font-size:13px;line-height:1.4;transition:background .12s,color .12s;display:flex}.section-nav-btn:hover{background:var(--bg);color:var(--text)}.section-nav-btn.active{color:var(--primary);background:#2da3d912;font-weight:600}.sec-num{background:var(--border);width:22px;height:22px;color:var(--text-light);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex}.section-nav-btn.active .sec-num{background:var(--primary);color:#fff}.chapter-main{min-width:0}.breadcrumb{color:var(--text-light);margin-bottom:20px;font-size:13px}.breadcrumb a{color:var(--text-light)}.breadcrumb a:hover{color:var(--primary)}.section-content{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px}.section-title{color:var(--text);margin-bottom:24px;font-size:24px;font-weight:800}.section-body .point-box{color:var(--text);background:#2da3d912;border:none;border-left:4px solid #2da3d9;border-radius:0 4px 4px 0;margin:20px 0;padding:14px 16px;font-size:14px;line-height:1.7}.section-body .caution-box{color:var(--text);background:#fff0f0;border:none;border-left:4px solid #e53e3e;border-radius:0 4px 4px 0;margin:20px 0;padding:14px 16px;font-size:14px;line-height:1.7}.section-body h3{color:var(--text);margin:24px 0 10px;font-size:17px;font-weight:700}.section-body p{margin-bottom:12px;font-size:15px;line-height:1.8}.section-body ul,.section-body ol{margin-bottom:12px;padding-left:24px}.section-body li{margin-bottom:6px;font-size:15px;line-height:1.7}.section-body strong{color:var(--primary-dark);font-weight:700}.section-body code{color:#282867;background:#28286712;border-radius:4px;padding:2px 7px;font-family:SFMono-Regular,Consolas,monospace;font-size:13.5px}.section-body pre{color:#d0d8f0;white-space:pre;background:#1a1940;border-radius:6px;margin:16px 0;padding:20px;font-family:SFMono-Regular,Consolas,monospace;font-size:13.5px;line-height:1.7;overflow-x:auto}.diagram-wrapper{margin:28px 0}.diagram-container{background:#f8faff;border:1px solid #e8edf8;border-radius:12px;padding:20px}.diagram-title{color:var(--text-light);text-align:center;text-transform:uppercase;letter-spacing:.5px;margin-bottom:16px;font-size:14px;font-weight:700}.diagram-svg{width:100%;max-width:520px;margin:0 auto;display:block}.truth-table-wrapper{overflow-x:auto}.truth-table{border-collapse:collapse;width:100%;font-size:14px}.truth-table th{background:var(--primary);color:#fff;text-align:center;padding:10px 16px;font-weight:700}.truth-table td{text-align:center;border-bottom:1px solid var(--border);padding:9px 16px;font-family:monospace;font-size:15px}.truth-table tr:hover td{background:#2da3d90a}.truth-table td.and{color:#e53e3e;font-weight:700}.truth-table td.or{color:#38a169;font-weight:700}.truth-table td.xor{color:#dd6b20;font-weight:700}.truth-table td.not{color:#805ad5;font-weight:700}.osi-layers{flex-direction:column;gap:6px;display:flex}.osi-layer{background:var(--surface);border-left:4px solid;border-radius:8px;align-items:center;gap:12px;padding:10px 14px;display:flex;box-shadow:0 1px 4px #0000000f}.osi-num{color:#fff;white-space:nowrap;border-radius:4px;padding:3px 8px;font-size:11px;font-weight:700}.osi-name{flex:1;font-size:14px;font-weight:700}.osi-protocol{color:var(--text-light);font-size:12px}.stack-queue-wrapper{flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:40px;display:flex}.ds-box{text-align:center}.ds-title{margin-bottom:10px;font-size:15px;font-weight:700}.ds-note{color:var(--text-light);margin-top:8px;font-size:12px}.sort-steps{flex-wrap:wrap;justify-content:center;gap:24px;display:flex}.sort-step{flex-direction:column;align-items:center;gap:8px;display:flex}.sort-label{color:var(--text-light);font-size:12px;font-weight:700}.sort-bars{align-items:flex-end;gap:4px;height:80px;display:flex}.sort-bar-wrap{flex-direction:column;align-items:center;gap:3px;display:flex}.sort-bar{border-radius:4px 4px 0 0;width:30px;transition:all .3s}.sort-val{font-size:13px;font-weight:700}.formula-box{padding:20px}.formula{background:var(--surface);border:2px solid var(--primary);border-radius:8px;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;padding:16px 20px;display:flex}.formula-label{color:var(--primary);font-size:15px;font-weight:800}.formula-eq{color:var(--text-light);font-size:18px;font-weight:700}.formula-num{color:var(--text);text-align:center;font-size:15px;font-weight:700}.formula-div{color:var(--text-light);font-size:18px}.formula-denom{color:var(--text-light);font-size:15px}.formula-example{text-align:center;color:var(--text-light);margin-top:16px;font-size:14px}.formula-example strong{color:var(--primary);font-size:16px}.quiz-section{border-top:2px dashed var(--border);margin-top:40px;padding-top:32px}.quiz-title{color:var(--text);margin-bottom:20px;font-size:18px;font-weight:800}.mini-quiz-title{color:var(--text-light);margin-bottom:16px;font-size:16px;font-weight:700}.section-quiz{margin-top:28px}.quiz-card{background:var(--bg);border:2px solid #0000;border-radius:10px;margin-bottom:16px;padding:20px;transition:border-color .2s}.quiz-card.correct{background:#f0fff4;border-color:#48bb78}.quiz-card.wrong{background:#fff5f5;border-color:#fc8181}.quiz-question{margin-bottom:14px;font-size:15px;font-weight:600;line-height:1.7}.quiz-num{background:var(--primary);color:#fff;border-radius:4px;margin-right:8px;padding:2px 8px;font-size:12px;font-weight:700;display:inline-block}.quiz-choices{flex-direction:column;gap:8px;display:flex}.choice-btn{background:var(--surface);border:2px solid var(--border);text-align:left;cursor:pointer;border-radius:8px;align-items:flex-start;gap:10px;padding:11px 14px;font-size:14px;line-height:1.5;transition:border-color .15s,background .15s;display:flex}.choice-btn:hover{border-color:var(--primary);background:#2da3d90a}.choice-btn.selected{border-color:var(--primary);background:#2da3d912}.choice-btn.correct-answer{background:#f0fff4!important;border-color:#48bb78!important}.choice-btn.wrong-answer{background:#fff5f5!important;border-color:#fc8181!important}.choice-label{color:var(--primary);flex-shrink:0;min-width:20px;font-weight:700}.explanation{border-radius:8px;margin-top:12px;padding:12px 14px;font-size:14px;line-height:1.6}.exp-correct{color:#276749;background:#c6f6d5}.exp-wrong{color:#c53030;background:#fed7d7}.exp-icon{margin-right:6px;font-weight:900}.quiz-actions{text-align:center;margin-top:24px}.btn-submit{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:13px 32px;font-size:16px;font-weight:700;transition:transform .15s,box-shadow .15s,background .15s;box-shadow:0 3px 10px #2da3d94d}.btn-submit:disabled{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}.btn-submit:not(:disabled):hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 5px 14px #2da3d966}.quiz-result{flex-direction:column;align-items:center;gap:12px;display:flex}.score-display{align-items:baseline;gap:6px;font-size:32px;font-weight:800;display:flex}.score-num{color:var(--primary)}.score-sep{color:var(--text-light)}.score-total{color:var(--text-light);font-size:24px}.score-label{color:var(--text-light);font-size:16px;font-weight:400}.perfect-msg{color:#38a169;font-size:15px;font-weight:700}.btn-reset{background:var(--surface);color:var(--primary);border:2px solid var(--primary);cursor:pointer;border-radius:8px;padding:10px 24px;font-size:14px;font-weight:700;transition:background .15s}.btn-reset:hover{background:var(--bg)}.mock-quiz-banner{background:var(--primary);border-radius:8px;margin:0 0 40px;box-shadow:0 3px 12px #2da3d940}.mock-quiz-banner-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:24px;padding:24px 32px;display:flex}.mock-quiz-banner-title{color:#fff;margin-bottom:6px;font-size:20px;font-weight:800}.mock-quiz-banner-desc{color:#ffffffd9;font-size:14px}.mock-quiz-banner-btn{color:var(--primary);white-space:nowrap;background:#fff;border-radius:10px;flex-shrink:0;padding:12px 28px;font-size:15px;font-weight:800;text-decoration:none;transition:transform .15s,box-shadow .15s;box-shadow:0 2px 10px #00000026}.mock-quiz-banner-btn:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 6px 20px #0003}.mock-quiz-page{min-height:calc(100vh - var(--nav-height));padding:40px 20px}.mock-quiz-container{max-width:800px;margin:0 auto}.mock-setup{background:var(--surface);text-align:center;box-shadow:var(--shadow);border-radius:16px;padding:48px 40px}.mock-setup-icon{margin-bottom:16px;font-size:52px}.mock-setup-title{margin-bottom:12px;font-size:26px;font-weight:800}.mock-setup-desc{color:var(--text-light);margin-bottom:32px;font-size:15px;line-height:1.7}.mock-count-label{color:var(--text-light);margin-bottom:12px;font-size:14px;font-weight:600}.mock-count-options{justify-content:center;gap:12px;margin-bottom:32px;display:flex}.mock-count-btn{background:var(--bg);border:2px solid var(--border);cursor:pointer;border-radius:12px;flex-direction:column;align-items:center;gap:2px;padding:16px 28px;transition:all .15s;display:flex}.mock-count-btn:hover{border-color:var(--primary)}.mock-count-btn.selected{border-color:var(--primary);background:#2da3d912}.mock-count-num{color:var(--primary);font-size:28px;font-weight:800}.mock-count-unit{color:var(--text-light);font-size:13px;font-weight:600}.btn-start-mock{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:14px 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solid;border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:160px;height:160px;margin:0 auto 20px;display:inline-flex}.mock-score-circle.pass{background:#48bb780f;border-color:#48bb78}.mock-score-circle.fail{background:#f6ad550f;border-color:#f6ad55}.mock-score-pct{font-size:40px;font-weight:900}.mock-score-circle.pass .mock-score-pct{color:#38a169}.mock-score-circle.fail .mock-score-pct{color:#c05621}.mock-score-label{color:var(--text-light);font-size:13px}.mock-verdict{margin-bottom:32px;font-size:15px;font-weight:600}.mock-verdict.pass{color:#38a169}.mock-verdict.fail{color:#c05621}.mock-breakdown{text-align:left;margin-bottom:32px}.mock-breakdown-title{margin-bottom:12px;font-size:16px;font-weight:700}.mock-breakdown-row{background:var(--bg);color:var(--text);border-radius:8px;align-items:center;gap:10px;margin-bottom:8px;padding:11px 14px;font-size:14px;text-decoration:none;transition:background 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