:root{
  --bg:#f5f8fc;--bg2:#eaf1f8;--card:#ffffff;--line:#d6e0ec;
  --ink:#0b1a2e;--muted:#4f6179;--cyan:#0e7490;--orange:#d9600b;--green:#15803d;--navy:#0b1a2e;
  --radius:16px;--fs:16px;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;font-size:var(--fs)}
html.projector{--fs:20px}
body{margin:0;background:var(--bg);color:var(--ink);line-height:1.65}
a{color:var(--cyan)}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:var(--orange);color:#000;padding:8px;z-index:99}
.nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:24px;padding:12px 4vw;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:700}
.brand svg{width:34px;height:34px;color:var(--orange)}
.brand small{display:block;font-size:.62rem;letter-spacing:.18em;color:var(--muted);font-weight:500}
.nav nav{display:flex;gap:18px;flex:1;flex-wrap:wrap}
.nav nav a{color:var(--muted);text-decoration:none;font-size:.92rem}
.nav nav a:hover{color:var(--cyan)}
.btn{display:inline-block;padding:10px 18px;border-radius:999px;font-weight:600;text-decoration:none;font-size:.95rem;cursor:pointer;border:1px solid transparent;font-family:inherit}
.btn.primary{background:var(--orange);color:#fff}
.btn.primary:hover{background:#b94f08}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover,.btn.ghost[aria-pressed=true]{border-color:var(--cyan);color:var(--cyan)}
.eyebrow{font-size:.75rem;letter-spacing:.22em;color:var(--cyan);font-weight:700;margin:0 0 8px}
h1{font-size:clamp(2.4rem,6vw,4.4rem);line-height:1.1;margin:.2em 0}
h1 em,h2 em{font-style:normal;color:var(--orange)}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem);margin:.1em 0 .3em}
.sub,.lead{color:var(--muted);max-width:720px}
.lead{font-size:1.12rem}
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;padding:72px 4vw 48px;min-height:78vh;background:repeating-linear-gradient(90deg,transparent 0 119px,rgba(14,116,144,.07) 119px 120px),radial-gradient(900px 500px at 85% 20%,rgba(14,116,144,.10),transparent),radial-gradient(700px 400px at 10% 90%,rgba(217,96,11,.08),transparent),linear-gradient(180deg,#ffffff,#eef4fa)}
.cta{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}
.stats{display:flex;gap:28px;list-style:none;padding:0;margin:28px 0 0;flex-wrap:wrap}
.stats b{display:block;font-size:2rem;color:var(--ink)}
.stats li{color:var(--muted);font-size:.85rem}
.hero-board{margin:0}
.hero-board svg{width:100%;height:auto;border-radius:18px;box-shadow:0 24px 60px rgba(11,26,46,.22)}
.route path{fill:none;stroke:#22d3ee;stroke-width:3;stroke-dasharray:400;stroke-dashoffset:400;animation:draw 2.4s ease forwards;marker-end:none}
.route circle{fill:#07111f;stroke:#f59e0b;stroke-width:3}
.route text{fill:#e8f1fb;font-size:14px;font-weight:700}
.r2 path{animation-delay:.6s}.r3 path{animation-delay:1.2s}
.board-label{fill:#8fa6c1;font-size:13px;letter-spacing:.08em}.board-label.small{font-size:11px}
@keyframes draw{to{stroke-dashoffset:0}}
@media (prefers-reduced-motion:reduce){.route path{animation:none;stroke-dashoffset:0}}
.section{padding:80px 4vw;border-top:1px solid var(--line)}
.levels{list-style:none;padding:0;display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:28px;counter-reset:l}
.levels button{width:100%;height:100%;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--ink);cursor:pointer;font-family:inherit;position:relative;overflow:hidden}
.levels button:hover,.levels button[aria-pressed=true]{border-color:var(--orange);transform:translateY(-2px)}
.levels button{transition:.2s}
.levels .lv{font-size:1.8rem;font-weight:800;color:var(--orange)}
.levels h3{margin:.2em 0;font-size:1.1rem}
.levels p{margin:0;color:var(--muted);font-size:.88rem}
.levels .count{display:block;margin-top:12px;font-size:.8rem;color:var(--cyan)}
.levels .yard{font-weight:700;position:absolute;right:12px;top:14px;font-size:.7rem;color:var(--muted);letter-spacing:.1em}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0 8px}
.chip{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:7px 14px;cursor:pointer;font-family:inherit;font-size:.9rem}
.chip{background:#fff}.chip[aria-pressed=true]{background:var(--navy);color:#fff;border-color:var(--cyan);font-weight:700}
.filter-state{color:var(--muted);font-size:.85rem;min-height:1.4em}
.filter-state button{background:none;border:0;color:var(--orange);cursor:pointer;font-family:inherit}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);box-shadow:0 2px 10px rgba(11,26,46,.05);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.2s}
.card:hover{border-color:var(--cyan);transform:translateY(-3px)}
.thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#dbe8f4,#c4d7ea);position:relative;overflow:hidden}
.thumb img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover;display:block}
.thumb .ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.85rem}
.badges{position:absolute;z-index:2;left:10px;top:10px;display:flex;gap:6px}
.badge{font-size:.72rem;font-weight:700;padding:3px 8px;border-radius:6px;background:rgba(11,26,46,.85);color:#fff}
.badge.live{background:var(--green);color:#fff}
.badge.lv{background:var(--orange);color:#fff}
.card-body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{margin:0;font-size:1.05rem;line-height:1.35}
.card .tag{font-size:.75rem;color:var(--cyan);letter-spacing:.06em}
.card p{margin:0;color:var(--muted);font-size:.9rem}
.teach{border-left:3px solid var(--orange);padding-left:10px;color:var(--ink)!important;font-size:.86rem!important}
.teach b{color:var(--orange);font-weight:600}
.links{display:flex;gap:10px;margin-top:auto;padding-top:8px}
.links a{font-size:.88rem;font-weight:600;text-decoration:none}
.links a.go{color:#fff;background:var(--cyan);padding:6px 12px;border-radius:8px}
.links a.src{color:var(--muted);padding:6px 0}
.lessons{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:20px;margin-top:24px}
.lesson{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.lesson h3{margin:.2em 0 .4em}
.lesson .meta{color:var(--cyan);font-size:.8rem;letter-spacing:.08em}
.lesson ol{padding-left:1.2em;margin:.6em 0 0;color:var(--muted)}
.lesson li{margin:.35em 0}
.lesson li a{color:var(--ink)}
.lesson .status{display:inline-block;margin-top:12px;font-size:.78rem;color:var(--orange)}
.safety{background:linear-gradient(180deg,var(--bg),var(--bg2))}
.rules{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:28px}
.rules article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.rules span{color:var(--orange);font-weight:800;font-size:1.4rem}
.rules h3{margin:.3em 0;font-size:1.05rem}
.rules p{margin:0;color:var(--muted);font-size:.9rem}
.tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin-top:24px}
.tool{display:block;background:#fff;border:1px dashed var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--ink)}
.tool:hover{border-color:var(--cyan);border-style:solid}
.tool b{display:block;font-size:.95rem}
.tool span{color:var(--muted);font-size:.84rem}
.about{display:block}.about>div{max-width:900px}
.about p{color:var(--muted)}
.foot{padding:36px 4vw;border-top:1px solid var(--line);color:var(--ink);text-align:center}
.muted{color:var(--muted);font-size:.85rem}
@media (max-width:980px){.hero{grid-template-columns:1fr;min-height:auto}.levels{grid-template-columns:repeat(2,1fr)}.rules{grid-template-columns:1fr 1fr}.nav nav{display:none}}
@media (max-width:560px){.levels,.rules{grid-template-columns:1fr}}

/* v1.1 light field + glossary/gear/library */
.section:nth-of-type(even){background:var(--bg2)}
.section{position:relative}
.section .eyebrow{display:inline-block;background:var(--navy);color:#fff;padding:3px 10px;border-radius:4px;letter-spacing:.18em}
.levels button{border-top:4px solid var(--navy)}
.levels button[aria-pressed=true]{border-top-color:var(--orange);background:#fff7ef}
.concepts{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:16px}
.concept{background:#fff;border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:12px;padding:16px 18px;display:flex;flex-direction:column;gap:6px}
.concept .badge{align-self:flex-start}
.concept h3{margin:2px 0 0;font-size:1.05rem}
.concept p{margin:0;color:var(--muted);font-size:.9rem}
.concept .play{color:var(--ink);background:var(--bg2);border-radius:8px;padding:8px 10px;font-size:.86rem}
.concept .play b{display:block;color:var(--cyan);font-size:.72rem;letter-spacing:.12em}
.concept a{margin-top:auto;font-weight:600;font-size:.88rem;text-decoration:none}
.gear{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:24px}
.gear-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
.gear-card .tag{font-size:.72rem;letter-spacing:.1em;color:#fff;background:var(--cyan);padding:2px 8px;border-radius:4px}
.gear-card h3{margin:.5em 0 .3em}.gear-card h3 a{color:var(--ink);text-decoration:none}
.gear-card dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:4px 10px;font-size:.88rem}
.gear-card dt{color:var(--orange);font-weight:700}.gear-card dd{margin:0;color:var(--muted)}
.library{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px;margin-top:12px}
.lib-item{display:block;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;text-decoration:none;color:var(--ink)}
.lib-item:hover{border-color:var(--cyan)}
.lib-item span{display:block;font-size:.72rem;color:var(--cyan);letter-spacing:.08em}
.lib-item b{font-weight:600;font-size:.93rem}
.foot{background:var(--navy);color:#e8f1fb}.foot .muted{color:#8fa6c1}

/* L0 drill (empty level state) */
.grid>.drill{grid-column:1/-1}
.drill{background:#fff;border:1px solid var(--line);border-top:4px solid var(--orange);border-radius:var(--radius);padding:24px;box-shadow:0 2px 12px rgba(11,26,46,.06)}
.drill-head h3{margin:.5em 0 .2em;font-size:1.25rem}
.drill-head p{margin:0;color:var(--muted)}
.drill-plays{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0 14px;position:relative}
.play-card{border-radius:12px;padding:16px;background:var(--bg2);border:1px solid var(--line);position:relative}
.play-card .down{display:inline-block;font-size:.7rem;letter-spacing:.14em;font-weight:800;color:#fff;background:var(--navy);padding:2px 8px;border-radius:4px}
.play-card b{display:block;margin:.5em 0 .3em}
.play-card .q{margin:0;font-size:.9rem;color:var(--ink);background:#fff;border:1px dashed var(--line);border-radius:8px;padding:8px 10px}
.play-card .a{margin:.6em 0 0;font-size:.86rem;color:var(--muted)}
.play-card.weak{border-left:4px solid #94a3b8}
.play-card.mid{border-left:4px solid var(--cyan)}
.play-card.good{border-left:4px solid var(--green);background:#f0fdf4}
.play-card.good .down{background:var(--green)}
.call{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:4px 0 14px}
.call b{margin-right:6px}
.call span{background:var(--navy);color:#fff;border-radius:999px;padding:4px 12px;font-size:.85rem}
.drill-terms{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}
.drill-terms b{margin-right:6px}
.drill-terms a{font-size:.88rem;text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:4px 12px}
.drill-terms a:hover{border-color:var(--cyan)}
.drill-next{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
@media (max-width:980px){.drill-plays{grid-template-columns:1fr}}

/* v1.3 实战案例 */
.case-feature{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:28px;align-items:center;margin-top:24px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 6px 24px rgba(11,26,46,.06)}
.case-cover{position:relative;display:block;border-radius:12px;overflow:hidden;border:3px solid var(--navy)}
.case-cover img{display:block;width:100%;height:auto;transition:transform .3s}
.case-cover:hover img{transform:scale(1.03)}
.case-cover span{position:absolute;left:12px;top:12px;background:#F2C14E;color:var(--navy);font-weight:800;font-size:.8rem;padding:4px 10px;border-radius:999px;border:2px solid var(--navy)}
.case-body .meta{color:var(--cyan);font-size:.8rem;letter-spacing:.08em;margin:0}
.case-body h3{margin:.2em 0 .4em;font-size:1.5rem}
.case-body>p{color:var(--muted);margin:0 0 14px}
.case-aud{list-style:none;padding:0;margin:0 0 18px;display:grid;grid-template-columns:1fr 1fr;gap:8px}
.case-aud li{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:.86rem;color:var(--muted)}
.case-aud b{display:block;color:var(--ink);font-size:.9rem}
@media (max-width:820px){.case-feature{grid-template-columns:1fr}.case-aud{grid-template-columns:1fr}}