:root{--bg:#f0fdfa;--surface:#fff;--surface2:#f0fdf9;--surface3:#e6f7f3;--border:#d1e8e3;--border2:#b2d8d0;--text:#134e4a;--text2:#1e5d57;--text3:#5f8a84;--primary:#0d9488;--primary-light:#ccfbf1;--primary-dark:#0a7a70;--secondary:#2dd4bf;--green:#059669;--green-bg:#ecfdf5;--green-border:#a7f3d0;--blue:#0284c7;--blue-bg:#f0f9ff;--blue-border:#bae6fd;--purple:#7c3aed;--purple-bg:#f5f3ff;--purple-border:#ddd6fe;--amber:#b45309;--amber-bg:#fffbeb;--amber-border:#fde68a;--red:#dc2626;--red-bg:#fef2f2;--red-border:#fecaca;--radius:16px;--radius-sm:10px;--radius-xs:6px;--shadow-sm:0 1px 2px #0d94880d;--shadow-md:0 4px 12px #0d948814, 0 2px 4px #0d94880a;--shadow-lg:0 10px 25px #0d94881f;--font-heading:"DM Sans", system-ui, sans-serif;--font-body:"Source Sans 3", system-ui, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;font-size:16px;line-height:1.75}.icon-svg{stroke:currentColor;fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;width:18px;height:18px}.icon-svg.lg{width:24px;height:24px}.header{background:var(--surface);border-bottom:1px solid var(--border);z-index:100;box-shadow:var(--shadow-sm);position:sticky;top:0}.header-inner{max-width:900px;margin:0 auto;padding:0 24px}.header-top{justify-content:space-between;align-items:center;padding:14px 0 10px;display:flex}.header-title{align-items:center;gap:12px;display:flex}.header-logo{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;width:38px;height:38px;font-family:var(--font-heading);border-radius:12px;justify-content:center;align-items:center;font-size:1rem;font-weight:800;display:flex;box-shadow:0 2px 8px #0d948840}.header h1{font-family:var(--font-heading);color:var(--text);letter-spacing:-.02em;font-size:1.3rem;font-weight:700}.header-sub{color:var(--text3);font-size:.82rem;font-weight:500}.progress-wrap{color:var(--text3);font-size:.8rem;font-weight:600;font-family:var(--font-heading);align-items:center;gap:8px;display:flex}.progress-bar{background:var(--primary-light);border-radius:3px;width:72px;height:6px;overflow:hidden}.progress-fill{background:var(--primary);border-radius:3px;width:0%;height:100%;transition:width .4s}.tabs{scrollbar-width:none;gap:0;margin:0 -24px;padding:0 24px;display:flex;overflow-x:auto}.tabs::-webkit-scrollbar{display:none}.tab{font-size:.88rem;font-weight:600;font-family:var(--font-heading);color:var(--text3);cursor:pointer;white-space:nowrap;background:0 0;border:none;padding:10px 16px;transition:color .2s;position:relative}.tab:hover{color:var(--text2)}.tab:focus-visible{outline:2px solid var(--primary);outline-offset:-2px;border-radius:4px}.tab.active{color:var(--primary)}.tab.active:after{content:"";background:var(--primary);border-radius:2px 2px 0 0;height:2.5px;position:absolute;bottom:0;left:14px;right:14px}.content{max-width:900px;margin:0 auto;padding:24px 24px 80px}.section{animation:.25s fadeIn;display:none}.section.active{display:block}.subpanel{display:none}.subpanel.active{display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.section{animation:none}.progress-fill{transition:none}}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);margin-bottom:14px;padding:24px}.card h2{font-family:var(--font-heading);color:var(--text);letter-spacing:-.01em;align-items:center;gap:8px;margin-bottom:14px;font-size:1.08rem;font-weight:700;display:flex}.card h3{font-family:var(--font-heading);color:var(--text2);border-bottom:1px solid var(--surface3);margin:20px 0 10px;padding-bottom:6px;font-size:.95rem;font-weight:600}.section-header{margin-bottom:20px}.section-header h2{font-family:var(--font-heading);color:var(--text);letter-spacing:-.02em;align-items:center;gap:8px;margin-bottom:4px;font-size:1.25rem;font-weight:700;display:flex}.section-header p{color:var(--text3);font-size:.92rem;line-height:1.6}.table-wrap{border-radius:var(--radius-sm);border:1px solid var(--border);margin:12px 0;overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:.92rem}th{background:var(--surface2);color:var(--text2);font-family:var(--font-heading);text-align:left;border-bottom:1px solid var(--border);text-transform:uppercase;letter-spacing:.04em;padding:11px 14px;font-size:.8rem;font-weight:600}td{border-bottom:1px solid var(--surface3);vertical-align:top;color:var(--text2);padding:11px 14px}tr:last-child td{border-bottom:none}tr:hover td{background:#0d948808}td strong{color:var(--text)}ol,ul{margin:8px 0;padding-left:22px}li{color:var(--text2);margin-bottom:8px;font-size:.95rem;line-height:1.7}li strong{color:var(--text)}.badge{font-size:.76rem;font-weight:700;font-family:var(--font-heading);letter-spacing:.03em;border-radius:20px;align-items:center;padding:2px 10px;display:inline-flex}.badge-b1{background:var(--green-bg);color:var(--green);border:1px solid var(--green-border)}.badge-b2{background:var(--blue-bg);color:var(--blue);border:1px solid var(--blue-border)}.badge-c1{background:var(--purple-bg);color:var(--purple);border:1px solid var(--purple-border)}.tip{border-radius:var(--radius-sm);margin:14px 0;padding:14px 18px;font-size:.95rem;line-height:1.65}.tip strong{font-weight:700}.tip-info{background:var(--blue-bg);border:1px solid var(--blue-border);color:#075985}.tip-warn{background:var(--amber-bg);border:1px solid var(--amber-border);color:var(--amber)}.tip-ok{background:var(--green-bg);border:1px solid var(--green-border);color:#065f46}.tip-magic{background:var(--amber-bg);border:1px solid var(--amber-border);color:var(--amber)}.tip-primary{background:var(--primary-light);border:1px solid var(--border2);color:var(--primary-dark)}pre{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);white-space:pre-wrap;word-wrap:break-word;color:var(--text2);margin:12px 0;padding:18px 20px;font-family:SF Mono,Cascadia Code,Fira Code,monospace;font-size:.88rem;line-height:1.85;overflow-x:auto}pre .magic{color:var(--amber);background:var(--amber-bg);border-radius:3px;padding:1px 4px;font-weight:700}pre .placeholder{color:var(--primary);font-weight:600}pre .comment{color:var(--text3);font-style:italic}.example{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text2);margin:12px 0;padding:20px;font-size:.95rem;line-height:1.75}.example 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(width<=640px){.magic[data-vi]:hover:after{white-space:normal;max-width:200px;left:0;transform:none}}.subtabs{flex-wrap:wrap;gap:6px;margin-bottom:18px;display:flex}.subtab{font-size:.85rem;font-weight:600;font-family:var(--font-heading);background:var(--surface);border:1px solid var(--border);color:var(--text3);cursor:pointer;box-shadow:var(--shadow-sm);border-radius:20px;padding:8px 18px;transition:all .2s}.subtab:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-light)}.subtab:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.subtab.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 2px 6px #0d948840}.score-grid{grid-template-columns:repeat(3,1fr);gap:12px;margin:16px 0;display:grid}.score-card{border-radius:var(--radius);text-align:center;box-shadow:var(--shadow-sm);cursor:default;padding:20px}.score-card.b1{background:var(--green-bg);border:1px solid var(--green-border)}.score-card.b2{background:var(--blue-bg);border:1px solid var(--blue-border)}.score-card.c1{background:var(--purple-bg);border:1px solid var(--purple-border)}.score-card .level{font-family:var(--font-heading);letter-spacing:-.03em;font-size:1.5rem;font-weight:800}.score-card.b1 .level{color:var(--green)}.score-card.b2 .level{color:var(--blue)}.score-card.c1 .level{color:var(--purple)}.score-card .label{font-family:var(--font-heading);color:var(--text3);text-transform:uppercase;letter-spacing:.05em;margin-top:2px;font-size:.76rem;font-weight:600}.score-card .range{color:var(--text2);margin-top:4px;font-size:.92rem;font-weight:600}.skill-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0;display:grid}.skill-card{border-radius:var(--radius);border:1px solid var(--border);background:var(--surface);box-shadow:var(--shadow-sm);cursor:pointer;padding:22px;transition:all .2s}.skill-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md);transform:translateY(-2px)}.skill-card:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.skill-card-icon{border-radius:12px;justify-content:center;align-items:center;width:40px;height:40px;margin-bottom:12px;display:flex}.skill-card-icon svg{stroke-width:1.8px;width:22px;height:22px}.skill-card-icon.listening{color:#2563eb;background:#dbeafe}.skill-card-icon.reading{color:#4f46e5;background:#e0e7ff}.skill-card-icon.writing{color:#db2777;background:#fce7f3}.skill-card-icon.speaking{color:#d97706;background:#fef3c7}.skill-card .skill-name{font-family:var(--font-heading);color:var(--text);margin-bottom:4px;font-size:1rem;font-weight:700}.skill-card .skill-desc{color:var(--text3);font-size:.88rem;line-height:1.55}.skill-card .skill-meta{color:var(--text3);font-size:.8rem;font-weight:600;font-family:var(--font-heading);gap:14px;margin-top:10px;display:flex}.checklist{padding-left:0;list-style:none}.checklist li{background:var(--surface2);border-radius:var(--radius-sm);cursor:pointer;-webkit-user-select:none;user-select:none;margin-bottom:4px;padding:10px 14px 10px 42px;font-size:.95rem;transition:background .15s;position:relative}.checklist li:hover{background:var(--surface3)}.checklist li:before{content:"";border:2px solid var(--border2);border-radius:5px;width:16px;height:16px;transition:all .15s;position:absolute;top:12px;left:14px}.checklist li.checked{color:var(--text3);text-decoration:line-through}.checklist li.checked:before{background:var(--primary);border-color:var(--primary);box-shadow:inset 0 0 0 2px #fff}.compare{grid-template-columns:1fr 1fr;gap:12px;margin:12px 0;display:grid}.compare-col{border-radius:var(--radius-sm);padding:18px;font-size:.95rem;line-height:1.7}.compare-col p{margin-bottom:6px}.compare-col.weak{background:var(--red-bg);border:1px solid var(--red-border)}.compare-col.strong{background:var(--green-bg);border:1px solid var(--green-border)}.compare-col .label{font-family:var(--font-heading);text-transform:uppercase;letter-spacing:.06em;border-radius:20px;margin-bottom:10px;padding:2px 10px;font-size:.76rem;font-weight:700;display:inline-block}.compare-col.weak .label{color:var(--red);background:#dc262614}.compare-col.strong .label{color:#065f46;background:#05966914}.lang-toggle{background:var(--surface2);border:1px solid var(--border);cursor:pointer;font-family:var(--font-heading);color:var(--text3);-webkit-user-select:none;user-select:none;border-radius:20px;align-items:center;gap:4px;padding:5px 10px;font-size:.8rem;font-weight:700;transition:all .2s;display:flex}.lang-toggle:hover{border-color:var(--primary);color:var(--primary)}.lang-toggle:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.scroll-top{background:var(--primary);color:#fff;cursor:pointer;width:42px;height:42px;box-shadow:var(--shadow-lg);z-index:50;border:none;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:none;position:fixed;bottom:24px;right:24px}.scroll-top:hover{background:var(--primary-dark);transform:scale(1.08)}.scroll-top:focus-visible{outline:2px solid var(--primary);outline-offset:3px}.scroll-top.visible{display:flex}.scroll-top svg{stroke:#fff;fill:none;stroke-width:2.5px;width:20px;height:20px}.doc-back-btn{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--primary);cursor:pointer;font-size:.9rem;font-weight:600;font-family:var(--font-body);align-items:center;gap:6px;margin-bottom:16px;padding:8px 16px;transition:all .15s;display:inline-flex}.doc-back-btn:hover{background:var(--primary-light);border-color:var(--primary)}.doc-category-title{font-family:var(--font-heading);color:var(--text);align-items:center;gap:8px;margin-bottom:12px;font-size:1rem;font-weight:700;display:flex}.doc-count{background:var(--primary-light);color:var(--primary);border-radius:10px;padding:2px 8px;font-size:.78rem;font-weight:700}.doc-list{flex-direction:column;gap:4px;display:flex}.doc-item{border-radius:var(--radius-xs);background:var(--surface2);cursor:pointer;text-align:left;font-family:var(--font-body);color:var(--text);border:1px solid #0000;align-items:center;gap:10px;width:100%;padding:10px 14px;font-size:.92rem;transition:all .15s;display:flex}.doc-item:hover{background:var(--primary-light);border-color:var(--border)}.doc-item-title{flex:1;font-weight:500}.doc-type-badge{text-transform:uppercase;font-size:.7rem;font-weight:700;font-family:var(--font-heading);border-radius:4px;flex-shrink:0;padding:2px 7px}.doc-type-badge.md{background:var(--blue-bg);color:var(--blue);border:1px solid var(--blue-border)}.doc-type-badge.pdf{background:var(--red-bg);color:var(--red);border:1px solid var(--red-border)}.doc-viewer{padding:24px}.markdown-body{color:var(--text);font-size:.95rem;line-height:1.8}.markdown-body h1{font-family:var(--font-heading);color:var(--text);border-bottom:2px solid var(--border);margin:24px 0 12px;padding-bottom:8px;font-size:1.5rem;font-weight:800}.markdown-body h2{font-family:var(--font-heading);color:var(--text);margin:20px 0 10px;font-size:1.25rem;font-weight:700}.markdown-body h3{font-family:var(--font-heading);color:var(--text2);margin:16px 0 8px;font-size:1.1rem;font-weight:700}.markdown-body p{margin:8px 0}.markdown-body ul,.markdown-body ol{margin:8px 0;padding-left:24px}.markdown-body li{margin:4px 0}.markdown-body strong{color:var(--text);font-weight:700}.markdown-body code{background:var(--surface3);border-radius:4px;padding:2px 6px;font-size:.88rem}.markdown-body pre{background:var(--surface3);border-radius:var(--radius-sm);margin:12px 0;padding:16px;overflow-x:auto}.markdown-body pre code{background:0 0;padding:0}.markdown-body blockquote{border-left:3px solid var(--primary);background:var(--surface2);border-radius:0 var(--radius-xs) var(--radius-xs) 0;margin:12px 0;padding:8px 16px}.markdown-body table{border-collapse:collapse;width:100%;margin:12px 0}.markdown-body th,.markdown-body td{border:1px solid var(--border);text-align:left;padding:8px 12px}.markdown-body th{background:var(--surface3);font-weight:700}.markdown-body hr{border:none;border-top:1px solid var(--border);margin:20px 0}.markdown-body a{color:var(--primary);text-decoration:none}.markdown-body a:hover{text-decoration:underline}@media (width<=640px){.header-inner,.content{padding-left:16px;padding-right:16px}.tabs{margin:0 -16px;padding:0 16px}.tab{padding:10px;font-size:.82rem}.card{border-radius:12px;padding:18px}.compare,.score-grid,.skill-grid{grid-template-columns:1fr}table{font-size:.85rem}th,td{padding:9px 10px}pre{padding:14px;font-size:.82rem}}