:root{color-scheme:light;--navy:#0b2045;--ink:#102449;--muted:#576983;--blue:#0755ef;--blue-soft:#eaf3ff;--border:#dce6f2;--surface:#f5f8fc;--red:#e52d2a;--white:#fff;--shadow:0 10px 32px rgba(25,58,103,.05)}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Inter,"Segoe UI","Microsoft YaHei",system-ui,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #375f9b;outline-offset:3px}.container{width:min(1400px,calc(100% - 80px));margin-inline:auto}.skip-link{position:absolute;left:1rem;top:-8rem;z-index:100;background:#fff;color:var(--navy);padding:.6rem 1rem;border:2px solid var(--blue)}.skip-link:focus{top:1rem}
.site-header{background:#fff;border-bottom:1px solid #e8edf5}.header-inner{min-height:70px;display:flex;align-items:center;gap:2.25rem}.brand{display:inline-flex;align-items:baseline;white-space:nowrap;letter-spacing:-.055em;font-weight:800;font-size:1.6rem;line-height:1;color:#101d34}.brand-x{color:var(--red)}.brand-solver{color:var(--blue)}.nav-links{display:flex;align-items:center;gap:2.35rem;margin-left:auto;font-size:.97rem;font-weight:600}.nav-links a{color:#233452;padding:.4rem 0}.nav-links a:hover{color:var(--blue)}.language-switch{display:flex;align-items:center;gap:.45rem;white-space:nowrap;font-size:.9rem;color:#52627c}.language-switch [aria-current]{color:var(--blue);font-weight:700;border-bottom:2px solid var(--blue)}.language-switch a:hover{color:var(--blue)}
.hero{background:linear-gradient(105deg,#f6f9fd 0%,#f0f5fb 100%);overflow:hidden}.hero-inner{min-height:352px;display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:center;gap:2.75rem;padding-block:3.6rem}.eyebrow{color:#5a6c86;font-size:.82rem;letter-spacing:.14em;font-weight:700;margin:0 0 .75rem}.hero h1{font-size:clamp(2.45rem,5vw,4.15rem);letter-spacing:-.045em;line-height:1.08;margin:0 0 .45rem;color:#081c40}.hero-subtitle{font-size:clamp(1.1rem,2vw,1.65rem);color:#52627c;line-height:1.25;margin:0 0 .85rem}.hero-description{max-width:37rem;color:#5b6e87;font-size:1.04rem;margin:0 0 1.35rem}.button{display:inline-flex;align-items:center;justify-content:center;gap:.7rem;border:0;border-radius:9px;background:var(--blue);color:#fff;font:inherit;font-weight:700;padding:.72rem 1.35rem;min-height:48px;cursor:pointer}.button:hover{background:#0849cb}.button svg{width:20px;height:20px}.hero-visual{min-width:0;margin:0}.hero-visual svg{display:block;width:100%;height:auto;filter:drop-shadow(0 14px 8px rgba(54,84,122,.07))}.legend{display:flex;justify-content:flex-end;gap:1.2rem;color:#52627c;font-size:.76rem}.legend span{display:inline-flex;gap:.35rem;align-items:center}.legend i{display:block;width:20px;border-top:3px solid var(--red)}.legend span+span i{border-color:#0872dc}
.category-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:15px}.category-card{position:relative;display:flex;min-height:174px;flex-direction:column;align-items:flex-start;padding:1.35rem 1.4rem 1.2rem;border-radius:9px;border:1px solid transparent;background:#edf6fd}.category-card:nth-child(2){background:#eef9f4}.category-card:nth-child(3){background:#fcf8f0}.category-card:nth-child(4){background:#f5f2fd}.category-card:is(a):hover{border-color:#9bbcf1;transform:translateY(-2px)}.category-icon{width:42px;height:42px;stroke:#11274b;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;margin-bottom:.75rem}.category-card h2{font-size:1.17rem;line-height:1.3;margin:0 0 .35rem;color:#0c2147}.category-card p{font-size:.87rem;line-height:1.5;color:#5d708a;margin:0;max-width:19rem}.category-card .arrow{position:absolute;right:1.35rem;bottom:1.25rem;font-size:1.25rem;color:#11284c}.status-label{display:inline-block;margin-top:.45rem;color:#718099;font-size:.72rem;font-weight:700;letter-spacing:.02em}
.section{padding-top:2.4rem}.section-heading{display:flex;align-items:center;gap:1.2rem;margin-bottom:1rem}.section-heading h2{margin:0;color:#0a1f45;font-size:1.6rem;line-height:1.3;white-space:nowrap}.section-heading::after{content:"";height:1px;background:#e3eaf3;flex:1}.tool-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.tool-card{display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:1.1rem;padding:1.15rem 1.3rem;border:1px solid var(--border);border-radius:9px;min-height:112px;background:#fff;transition:border-color .15s,box-shadow .15s}.tool-card:hover{border-color:#a2c1ef;box-shadow:var(--shadow)}.tool-icon{width:38px;height:38px;stroke:#153358;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.tool-card h3{font-size:1.02rem;line-height:1.3;margin:0 0 .25rem}.tool-card p{font-size:.84rem;color:#52627c;margin:0;line-height:1.5}.tool-arrow{font-size:1.35rem;color:#17365d}.ad-slot{display:flex;align-items:center;justify-content:center;min-height:76px;margin:1.25rem 0 0;border-radius:7px;background:#f1f3f6;color:#52627c;font-size:.75rem;letter-spacing:.04em}.about{display:grid;grid-template-columns:1fr 1fr;gap:2rem;padding-block:2.6rem 3rem}.about h2{font-size:1.35rem;margin:0 0 .65rem}.about p{max-width:40rem;color:#61728a;font-size:.9rem;margin:.35rem 0}.about .about-note{border-left:3px solid #a9c7f4;padding-left:1rem}.site-footer{border-top:1px solid #e6edf5;padding:1.35rem 0}.footer-inner{display:flex;align-items:center;gap:1.5rem}.site-footer .brand{font-size:1.2rem}.footer-copy{font-size:.76rem;color:#52627c}.footer-nav{display:flex;align-items:center;gap:1.2rem;margin-left:auto;color:#52627c;font-size:.8rem}.footer-nav a:hover{color:var(--blue)}
@media(max-width:900px){.container{width:min(calc(100% - 40px),1400px)}.header-inner{gap:1rem;flex-wrap:wrap;padding-block:1rem}.nav-links{gap:1.1rem}.hero-inner{grid-template-columns:1fr 1fr;gap:1.5rem;padding-block:3rem}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.category-card{min-height:155px}}
@media(max-width:600px){.container{width:calc(100% - 32px)}.header-inner{min-height:64px}.brand{font-size:1.35rem}.language-switch{margin-left:auto}.nav-links{order:3;flex-basis:100%;margin:0;gap:1.25rem;font-size:.86rem}.hero-inner{grid-template-columns:1fr;padding-block:2.5rem 1.6rem;gap:1rem}.hero h1{font-size:2.35rem}.hero-subtitle{font-size:1.1rem}.hero-description{font-size:.95rem}.hero-visual{max-width:560px}.legend{justify-content:flex-start}.category-grid{gap:10px;margin-top:10px}.category-card{padding:1rem;min-height:150px}.category-card h2{font-size:1rem}.category-card p{font-size:.78rem}.category-icon{width:34px;height:34px;margin-bottom:.5rem}.category-card .arrow{right:1rem;bottom:.8rem}.section{padding-top:1.8rem}.section-heading h2{font-size:1.35rem}.tool-grid{grid-template-columns:1fr;gap:10px}.tool-card{min-height:96px;padding:1rem}.about{grid-template-columns:1fr;gap:1rem;padding-block:2rem}.footer-inner{align-items:flex-start;flex-direction:column;gap:.6rem}.footer-nav{margin-left:0;flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}