.idi-hub{--idi-accent:#2563eb}.idi-hero{background:linear-gradient(#eef2ff,#fff);border-bottom:1px solid #e2e8f0;padding:28px 0 24px}.idi-hero-inner{max-width:960px;margin:0 auto;padding:0 16px}.idi-hero-crumbs{align-items:center;gap:6px;margin-bottom:14px;font-size:12px;display:flex}.idi-hero-crumbs a{color:#4f46e5;text-decoration:none}.idi-hero-crumbs a:hover{text-decoration:underline}.idi-hero-crumbs .sep{color:#94a3b8}.idi-hero-crumbs .here{color:#334155;font-weight:600}.idi-hero-trust{color:#4338ca;background:#e0e7ff;border-radius:9999px;align-items:center;gap:6px;margin-bottom:14px;padding:4px 12px;font-size:12px;font-weight:600;display:inline-flex}.idi-hero-trust svg{width:13px;height:13px}.idi-hero-main{align-items:flex-start;gap:18px;display:flex}.idi-hero-emoji{flex-shrink:0;margin-top:4px;font-size:40px;line-height:1}.idi-hero h1{color:#0f172a;letter-spacing:-.025em;margin-bottom:14px;font-size:36px;font-weight:800;line-height:1.1}.idi-hero p{color:#475569;line-height:1.7}.idi-hero p.lead{margin-bottom:10px;font-size:15.5px}.idi-hero p.sub{color:#64748b;font-size:14px}.idi-hero p strong{color:#0f172a}.idi-hero p a{color:#4f46e5;font-weight:600;text-decoration:none}.idi-hero p a:hover{text-decoration:underline}.idi-hero-stats{background:#e2e8f0;border:1px solid #e2e8f0;border-radius:14px;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:24px;display:grid;overflow:hidden}.idi-hero-stat{text-align:left;color:inherit;background:#fff;padding:14px 16px;text-decoration:none}.idi-hero-stat-num{letter-spacing:-.02em;font-size:22px;font-weight:800;line-height:1}.idi-hero-stat-label{color:#0f172a;margin-top:4px;font-size:12px;font-weight:600}.idi-hero-stat-sub{color:#94a3b8;margin-top:2px;font-size:11px}.idi-hero-stat--link{cursor:pointer;transition:background .15s}.idi-hero-stat--link:hover{background:color-mix(in srgb, var(--idi-accent) 7%, #fff)}.idi-hero-stat--link .idi-hero-stat-sub{color:#4f46e5;font-weight:700}.idi-jumpnav{z-index:30;-webkit-backdrop-filter:blur(8px);background:#f8fafceb;border-bottom:1px solid #e2e8f0;position:sticky;top:64px}.idi-jumpnav-inner{scrollbar-width:none;gap:8px;max-width:1152px;margin:0 auto;padding:10px 16px;display:flex;overflow-x:auto}.idi-jumpnav-inner::-webkit-scrollbar{display:none}.idi-jumpnav-pill{color:#475569;white-space:nowrap;cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:9999px;flex-shrink:0;align-items:center;gap:6px;padding:6px 12px;font-size:12px;font-weight:600;text-decoration:none;transition:background-color .15s,color .15s,border-color .15s;display:inline-flex}.idi-jumpnav-pill:hover{color:#1e293b;border-color:#cbd5e1}.idi-jumpnav-pill.is-active{color:#fff;background:#4f46e5;border-color:#4f46e5}.idi-section{margin:0 0 56px}.idi-section[id]{scroll-margin-top:120px}.idi-fade-in{animation:.24s forwards idi-fade-in}@keyframes idi-fade-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.idi-section-header{margin-bottom:28px}.idi-section-eyebrow{letter-spacing:.1em;color:var(--idi-accent);background:linear-gradient(90deg, color-mix(in srgb, var(--idi-accent) 14%, transparent), color-mix(in srgb, var(--idi-accent) 4%, transparent));border:1px solid color-mix(in srgb, var(--idi-accent) 24%, transparent);border-radius:9999px;align-items:center;gap:6px;margin-bottom:14px;padding:4px 10px;font-size:10.5px;font-weight:700;display:inline-flex}.idi-section-eyebrow .icon{font-size:12px}.idi-section-titlerow{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;display:flex}.idi-section-h2{color:#0f172a;letter-spacing:-.02em;margin:0;padding-bottom:10px;font-size:26px;font-weight:800;line-height:1.15;position:relative}.idi-section-h2:after{content:"";background:linear-gradient(90deg, var(--idi-accent), color-mix(in srgb, var(--idi-accent) 33%, transparent) 70%, transparent);border-radius:2px;width:44px;height:3px;position:absolute;bottom:0;left:0}.idi-section-meta{flex-wrap:wrap;gap:8px;display:flex}.idi-section-meta-badge{color:#475569;background:#fff;border:1px solid #e2e8f0;border-radius:9999px;align-items:center;gap:5px;padding:5px 10px;font-size:11.5px;font-weight:600;display:inline-flex}.idi-section-sub{color:#64748b;max-width:680px;margin-top:10px;font-size:14px;line-height:1.6}.idi-section-sub em{color:#4f46e5;font-style:normal;font-weight:600}.idi-ad{margin:0 0 56px}.idi-card{border-radius:14px;transition:transform .3s cubic-bezier(.4,0,.2,1),box-shadow .3s cubic-bezier(.4,0,.2,1),border-color .3s;position:relative;overflow:hidden}.idi-card:hover{box-shadow:0 18px 30px -12px color-mix(in srgb, var(--idi-accent) 32%, transparent);transform:translateY(-3px);border-color:color-mix(in srgb, var(--idi-accent) 35%, #e2e8f0)!important}.idi-card-accent{background:linear-gradient(90deg, var(--idi-accent), transparent);transform-origin:0;opacity:.4;pointer-events:none;border-top-left-radius:inherit;border-top-right-radius:inherit;height:3px;transition:transform .4s cubic-bezier(.4,0,.2,1),opacity .4s;position:absolute;top:0;left:0;right:0;transform:scaleX(.25)}.idi-card:hover .idi-card-accent{opacity:1;transform:scaleX(1)}.idi-card-tint{background:radial-gradient(circle, color-mix(in srgb, var(--idi-accent) 14%, transparent) 0%, transparent 70%);opacity:.55;pointer-events:none;width:130px;height:130px;transition:opacity .3s;position:absolute;top:-30px;right:-30px}.idi-card:hover .idi-card-tint{opacity:1}.idi-card-glow{background:radial-gradient(circle, color-mix(in srgb, var(--idi-accent) 22%, transparent) 0%, transparent 65%);opacity:0;pointer-events:none;width:130px;height:130px;transition:opacity .3s;position:absolute;bottom:-25px;left:-25px}.idi-card:hover .idi-card-glow{opacity:1}.idi-card-arrow{opacity:0;transition:opacity .28s,transform .28s;display:inline-block;transform:translate(-4px)}.idi-card:hover .idi-card-arrow{opacity:1;transform:translate(0)}.idi-card:hover .idi-card-title{color:var(--idi-accent)}.idi-map-grid{grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:14px;display:grid}.idi-mapcard{cursor:pointer;background:#fff;border:1px solid #e2e8f0;flex-direction:column;min-height:170px;padding:18px;text-decoration:none;display:flex}.idi-mapcard-inner{z-index:1;flex-direction:column;flex:1;display:flex;position:relative}.idi-mapcard-top{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.idi-mapcard-icon{font-size:26px;line-height:1}.idi-mapcard-count{border-radius:9999px;padding:3px 9px;font-size:10.5px;font-weight:700}.idi-mapcard-name{color:#0f172a;margin-bottom:6px;font-size:16px;font-weight:700;line-height:1.25;transition:color .2s}.idi-mapcard-desc{color:#64748b;font-size:12.5px;line-height:1.5}.idi-mapcard-foot{margin-top:auto;padding-top:12px}.idi-mapcard-go{color:#475569;align-items:center;gap:4px;font-size:12.5px;font-weight:700;transition:color .2s;display:inline-flex}.idi-finder{background:#fff;border:1px solid #e2e8f0;border-radius:20px;overflow:hidden;box-shadow:0 1px 2px #0f172a0a}.idi-finder-controls{background:color-mix(in srgb, var(--idi-accent) 5%, #fff);border-bottom:1px solid #e2e8f0;flex-wrap:wrap;align-items:center;gap:12px;padding:16px 18px;display:flex}.idi-finder-search{flex:1;align-items:center;min-width:220px;display:flex;position:relative}.idi-finder-search svg{color:#94a3b8;pointer-events:none;position:absolute;left:12px}.idi-finder-search input{color:#0f172a;background:#fff;border:1.5px solid #e2e8f0;border-radius:10px;width:100%;padding:10px 12px 10px 36px;font-size:14px}.idi-finder-search input:focus{border-color:var(--idi-accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--idi-accent) 18%, transparent);outline:none}.idi-finder-rows{max-height:560px;overflow-y:auto}.idi-finder-row{border-bottom:1px solid #f1f5f9;grid-template-columns:1fr 1.2fr;gap:18px;padding:13px 22px;text-decoration:none;transition:background .12s;display:grid}.idi-finder-row:last-child{border-bottom:none}.idi-finder-row:hover{background:color-mix(in srgb, var(--idi-accent) 4%, #fff)}.idi-finder-main{flex-direction:column;gap:4px;min-width:0;display:flex}.idi-finder-en{color:#0f172a;align-items:center;gap:8px;font-size:14.5px;font-weight:700;display:inline-flex}.idi-finder-lit{color:#94a3b8;font-size:12px;font-style:italic}.idi-finder-reg{letter-spacing:.02em;color:var(--idi-accent);background:color-mix(in srgb, var(--idi-accent) 12%, #fff);border:1px solid color-mix(in srgb, var(--idi-accent) 22%, transparent);border-radius:9999px;align-self:flex-start;padding:1px 7px;font-size:10px;font-weight:700}.idi-finder-audio{width:24px;height:24px;color:var(--idi-accent);cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:inline-flex}.idi-finder-audio svg{width:13px;height:13px}.idi-finder-audio:hover{background:color-mix(in srgb, var(--idi-accent) 12%, #fff)}.idi-finder-mean{flex-direction:column;gap:3px;min-width:0;display:flex}.idi-finder-eq{color:var(--idi-accent);font-size:14px;font-weight:700}.idi-finder-def{color:#475569;font-size:13px;line-height:1.4}.idi-finder-ex{flex-direction:column;gap:1px;margin-top:4px;display:flex}.idi-finder-ex .en{color:#0f172a;font-size:12.5px;font-style:italic}.idi-finder-ex .cs{color:#94a3b8;font-size:12px}.idi-finder-empty{text-align:center;color:#94a3b8;padding:28px 22px;font-size:13.5px}.idi-finder-hint{text-align:center;color:#94a3b8;padding:22px;font-size:13px}@media (max-width:640px){.idi-finder-row{grid-template-columns:1fr;gap:8px}}.idi-flash-wrap{flex-direction:column;gap:18px;display:flex}.idi-flash-topics{flex-wrap:wrap;gap:8px;display:flex}.idi-flash-chip{color:#475569;cursor:pointer;background:#fff;border:1.5px solid #e2e8f0;border-radius:9999px;padding:7px 12px;font-size:12px;font-weight:600;transition:background-color .15s,color .15s,border-color .15s}.idi-flash-chip:hover{border-color:#cbd5e1}.idi-flash-chip.is-active{color:#fff;background:#db2777;border-color:#db2777}.idi-flash{flex-direction:column;align-items:center;gap:14px;display:flex}.idi-flash-card{perspective:1400px;cursor:pointer;width:100%;max-width:520px;height:280px;position:relative}.idi-flash-face{backface-visibility:hidden;text-align:center;border:1px solid #e2e8f0;border-radius:20px;flex-direction:column;justify-content:center;align-items:center;padding:28px;transition:transform .52s cubic-bezier(.4,0,.2,1);display:flex;position:absolute;inset:0;box-shadow:0 12px 30px -14px #0f172a47}.idi-flash-front{background:linear-gradient(135deg,#fff,#fdf2f8);transform:rotateY(0)}.idi-flash-back{background:linear-gradient(135deg,#fff,#eef2ff);transform:rotateY(180deg)}.idi-flash-card.is-flipped .idi-flash-front{transform:rotateY(-180deg)}.idi-flash-card.is-flipped .idi-flash-back{transform:rotateY(0)}.idi-flash-label{letter-spacing:.12em;color:#db2777;margin-bottom:14px;font-size:10px;font-weight:800}.idi-flash-back .idi-flash-label{color:#4f46e5}.idi-flash-en{color:#0f172a;letter-spacing:-.02em;font-size:26px;font-weight:800;line-height:1.2}.idi-flash-literal{color:#94a3b8;margin-top:10px;font-size:14px;font-style:italic}.idi-flash-audio{color:#db2777;cursor:pointer;background:#fff;border:1px solid #f9a8d4;border-radius:50%;justify-content:center;align-items:center;width:38px;height:38px;margin-top:16px;display:inline-flex}.idi-flash-audio svg{width:18px;height:18px}.idi-flash-hint{color:#cbd5e1;margin-top:16px;font-size:11.5px}.idi-flash-meaning{color:#0f172a;font-size:19px;font-weight:700;line-height:1.3}.idi-flash-equiv{color:#4f46e5;margin-top:10px;font-size:14.5px;font-weight:600}.idi-flash-ex{flex-direction:column;gap:2px;margin-top:14px;display:flex}.idi-flash-ex .en{color:#334155;font-size:13.5px;font-style:italic}.idi-flash-ex .cs{color:#94a3b8;font-size:12.5px}.idi-flash-more{color:#4f46e5;margin-top:16px;font-size:12.5px;font-weight:700;text-decoration:none}.idi-flash-more:hover{text-decoration:underline}.idi-flash-controls{align-items:center;gap:10px;display:flex}.idi-flash-btn{color:#475569;cursor:pointer;background:#fff;border:1.5px solid #e2e8f0;border-radius:50%;width:40px;height:40px;font-size:22px;line-height:1;transition:border-color .15s,color .15s}.idi-flash-btn:hover{color:#db2777;border-color:#db2777}.idi-flash-flip{color:#fff;cursor:pointer;background:linear-gradient(135deg,#db2777,#be185d);border:none;border-radius:9999px;padding:10px 20px;font-size:13.5px;font-weight:700;transition:filter .15s}.idi-flash-flip:hover{filter:brightness(1.07)}.idi-flash-progress{color:#94a3b8;font-size:12px;font-weight:600}.idi-stories{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;display:grid}.idi-story{background:#fff;border:1px solid #e2e8f0}.idi-story-inner{z-index:1;padding:18px;position:relative}.idi-story-en{color:#0f172a;margin:0 0 4px;font-size:16px;font-weight:800}.idi-story-meaning{color:var(--idi-accent);margin:0 0 10px;font-size:13px;font-weight:600}.idi-story-origin{color:#475569;margin:0 0 12px;font-size:13px;line-height:1.6}.idi-story-link{color:#c2410c;font-size:12.5px;font-weight:700;text-decoration:none}.idi-story-link:hover{text-decoration:underline}.idi-traps{grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:14px;display:grid}.idi-trap{border:1px solid #e2e8f0;border-left:4px solid var(--idi-accent);background:#fff;border-radius:12px;padding:16px 18px}.idi-trap-en{color:#0f172a;margin-bottom:10px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;font-weight:700}.idi-trap-wrong{color:#b91c1c;margin-bottom:6px;font-size:13px;line-height:1.5}.idi-trap-right{color:#15803d;font-size:13px;line-height:1.5}.idi-tests{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;display:grid}.idi-test{background:#fff;border:1px solid #e2e8f0;text-decoration:none}.idi-test-inner{z-index:1;align-items:center;gap:14px;padding:18px;display:flex;position:relative}.idi-test-icon{flex-shrink:0;font-size:26px}.idi-test-name{color:#0f172a;font-size:15px;font-weight:700;transition:color .2s}.idi-test-meta{color:#94a3b8;margin-top:2px;font-size:12px}.idi-test .idi-card-arrow{color:var(--idi-accent);margin-left:auto}.idi-articles-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;display:grid}.idi-back{text-align:center;margin-top:8px}.idi-back a{color:#4f46e5;align-items:center;gap:8px;font-size:14px;font-weight:600;text-decoration:none;display:inline-flex}.idi-back a:hover{text-decoration:underline}.idi-faq{flex-direction:column;gap:10px;display:flex}.idi-faq-item{background:#fff;border:1px solid #e2e8f0;border-radius:12px;overflow:hidden}.idi-faq-q{color:#0f172a;cursor:pointer;padding:16px 44px 16px 18px;font-size:14.5px;font-weight:700;list-style:none;position:relative}.idi-faq-q::-webkit-details-marker{display:none}.idi-faq-q:after{content:"+";color:#94a3b8;font-size:20px;font-weight:400;position:absolute;top:50%;right:18px;transform:translateY(-50%)}.idi-faq-item[open] .idi-faq-q:after{content:"−"}.idi-faq-a{color:#475569;padding:0 18px 16px;font-size:13.5px;line-height:1.65}@media (max-width:680px){.idi-hero h1{font-size:28px}.idi-hero-stats{grid-template-columns:repeat(2,1fr)}.idi-section-h2{font-size:22px}.idi-flash-card{height:300px}}@media (prefers-reduced-motion:reduce){.idi-fade-in{animation:none!important}.idi-card,.idi-flash-face{transition:none!important}}@media (pointer:coarse){.idi-finder-search input{font-size:16px}}