.opening-page-hero{background:linear-gradient(90deg,#020b18fa,#020b18eb 45%,#020b18c7),radial-gradient(circle at center right,rgba(30,123,255,.2),transparent 38%),#020b18;color:#fff;padding:82px 0 58px}.opening-page-hero-inner{max-width:960px}.opening-page-hero h1{font-size:clamp(3rem,7vw,6rem);line-height:.95;letter-spacing:-.07em;margin:18px 0;color:#fff}.opening-page-hero p{max-width:780px;color:#ffffffc7;font-size:1.15rem;line-height:1.7}.opening-hero-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.opening-hero-chip{background:#ffffff14;border:1px solid rgba(255,255,255,.14);color:#ffffffd6;padding:10px 14px;border-radius:999px;font-size:.92rem;font-weight:750}.opening-trainer-section{background:#fff;padding:72px 0}.opening-app{display:grid;grid-template-columns:320px minmax(420px,560px) 320px;gap:24px;align-items:start}.opening-panel,.opening-board-shell,.opening-summary-card,.opening-seo-content,.opening-faq details{background:#fff;border:1px solid rgba(15,23,42,.08);border-radius:22px;box-shadow:0 18px 48px #0f172a17}.opening-panel{padding:24px}.opening-panel h2{margin:0 0 16px;color:#0f172a;font-size:1.45rem;letter-spacing:-.04em}.opening-panel h3{margin-bottom:8px;color:#0f172a}.opening-panel p{color:#5b6472}.opening-small-label{font-size:.72rem;text-transform:uppercase;color:#1e7bff;font-weight:900;letter-spacing:.12em}.opening-current-move{color:#1e7bff;font-weight:900;margin-top:6px}.opening-mode-tabs{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.opening-btn{background:linear-gradient(135deg,#3391ff,#156df0);color:#fff;border:none;padding:13px 18px;border-radius:999px;font-weight:900;cursor:pointer;font-size:.9rem;transition:transform .15s ease,opacity .15s ease,background .15s ease,box-shadow .15s ease;box-shadow:0 10px 22px #1e7bff38}.opening-btn:hover{transform:translateY(-1px);box-shadow:0 14px 28px #1e7bff47}.opening-btn.secondary{background:#eef5ff;color:#0f172a;box-shadow:none;border:1px solid #d7e7ff}.opening-btn.green{background:#16a34a;color:#fff}.opening-btn.red{background:#ef4444;color:#fff}.opening-btn.ghost{background:#fff;color:#5b6472;border:1px solid rgba(15,23,42,.12);box-shadow:none}.opening-btn.active{background:linear-gradient(135deg,#3391ff,#156df0);color:#fff;border:none}.opening-btn:disabled{opacity:.38;cursor:not-allowed;transform:none;box-shadow:none}.opening-move-box,.opening-info-card,.opening-mini-card{margin-top:15px;padding:15px;border-radius:16px;background:#f5f7fb;border:1px solid rgba(15,23,42,.08);color:#5b6472}.opening-progress-wrap{margin-top:18px;background:#f5f7fb;border:1px solid rgba(15,23,42,.08);padding:14px;border-radius:16px}.opening-progress-top{display:flex;justify-content:space-between;color:#5b6472;font-size:.82rem;margin-bottom:10px}.opening-progress-bar{width:100%;height:10px;background:#dbe7f5;border-radius:999px;overflow:hidden}.opening-progress-fill{height:100%;width:0%;background:linear-gradient(90deg,#1e7bff,#38bdf8);border-radius:999px}.opening-moves-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.opening-move-pill{background:#fff;border:1px solid rgba(15,23,42,.1);color:#5b6472;padding:9px 12px;border-radius:999px;font-size:.88rem;cursor:pointer;font-weight:750;transition:.15s ease}.opening-move-pill:hover{border-color:#1e7bff73;color:#1e7bff}.opening-move-pill.active{background:#1e7bff;color:#fff;border-color:#1e7bff;font-weight:900}.opening-variant-buttons{display:grid;gap:10px;margin-top:16px}.opening-board-card{text-align:center}.opening-board-shell{padding:20px;background:#fff}#board{display:inline-block;border:8px solid #020b18;border-radius:18px;overflow:hidden;background:#fff;max-width:100%}#board svg{display:block;max-width:100%;height:auto}.opening-controls{margin-top:18px;display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.opening-comment-card{background:#f5f7fb;padding:20px;border-radius:18px;border:1px solid rgba(15,23,42,.08);border-left:5px solid #1e7bff}.opening-comment-card h3{color:#1e7bff;margin:8px 0}.opening-comment-card p{margin-bottom:0;color:#5b6472;line-height:1.65}.opening-attack-list,.opening-error-list,.opening-seo-list{padding-left:20px;color:#5b6472;line-height:1.75}.opening-attack-list li,.opening-seo-list li{margin-bottom:6px}.opening-train-box{margin-top:18px;padding:18px;border-radius:18px;background:#eef7ff;border:1px solid #cfe7ff;display:none}.opening-train-box h3{margin:8px 0}.opening-train-options{display:grid;gap:10px;margin-top:14px}.opening-feedback{margin-top:12px;padding:13px;border-radius:14px;display:none;font-weight:850}.opening-feedback.good{display:block;color:#052e16;background:#bbf7d0}.opening-feedback.bad{display:block;color:#450a0a;background:#fecaca}.opening-summary-section{background:#fff;padding:0 0 72px}.opening-summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.opening-summary-card{padding:22px}.opening-summary-card h3{margin:8px 0 10px;color:#0f172a;font-size:1.25rem;letter-spacing:-.03em}.opening-summary-card p{color:#5b6472}.opening-summary-card strong{color:#1e7bff}.opening-seo-section{background:#f5f7fb;padding:72px 0}.opening-seo-content{padding:36px 40px;max-width:1100px;margin:0 auto}.opening-seo-content h2{font-size:clamp(2rem,4vw,3rem);line-height:1;letter-spacing:-.05em;margin:0 0 14px;color:#0f172a}.opening-seo-content h3{color:#0f172a;margin-top:30px;font-size:1.35rem}.opening-seo-content p{color:#5b6472;line-height:1.75}.opening-seo-content strong{color:#0f172a}.opening-faq-section{background:#fff;padding:72px 0}.opening-faq{max-width:1100px;margin:0 auto}.opening-faq h2{font-size:clamp(2rem,4vw,3rem);line-height:1;letter-spacing:-.05em;margin:0 0 24px;color:#0f172a}.opening-faq details{padding:18px 20px;margin-bottom:12px;box-shadow:none}.opening-faq summary{cursor:pointer;font-weight:900;color:#0f172a}.opening-faq p{color:#5b6472;margin-bottom:0}@media(max-width:1180px){.opening-app{grid-template-columns:1fr}.opening-board-card{order:-1}.opening-summary-grid{grid-template-columns:1fr}}@media(max-width:720px){.opening-page-hero{padding:58px 0 42px}.opening-trainer-section,.opening-seo-section,.opening-faq-section{padding:54px 0}.opening-summary-section{padding-bottom:54px}.opening-panel,.opening-board-shell,.opening-seo-content{padding:18px}.opening-controls{flex-direction:column}.opening-controls .opening-btn{width:100%}.opening-mode-tabs{grid-template-columns:1fr}}@media(max-width:520px){.opening-page-hero h1{font-size:clamp(2.6rem,15vw,4rem)}.opening-hero-chips{flex-direction:column}.opening-hero-chip{width:100%}#board{border-width:5px}}