:root{font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;background:#f7f7f4;color:#1d1f23}*{box-sizing:border-box}body{margin:0}main{max-width:1420px;margin:0 auto;padding:28px 36px}h1{font-size:36px;margin:0 0 16px}h2{font-size:28px;margin:12px 0}h3{font-size:25px;margin:10px 0 16px}p{line-height:1.45}.cards{display:grid;grid-template-columns:1fr 1fr;gap:16px}.cards a,button{background:#222;color:#fff;padding:13px 18px;border-radius:9px;text-decoration:none;border:0;cursor:pointer}textarea,input,select{width:100%;box-sizing:border-box;padding:14px;margin:8px 0 16px;border:1px solid #cfd3d8;border-radius:10px;background:#fff;font:inherit}.progress{font-weight:600;color:#5e6570}.training-layout{display:grid;grid-template-columns:minmax(520px,660px) minmax(420px,1fr);gap:38px;align-items:start;margin-top:18px}.board-shell{display:grid;grid-template-columns:26px 1fr;grid-template-rows:1fr 28px;width:min(660px,100%)}.rank-axis{grid-column:1;grid-row:1;display:grid;grid-template-rows:repeat(8,1fr);align-items:center;text-align:center;font-weight:600;color:#3d4650}.file-axis{grid-column:2;grid-row:2;display:grid;grid-template-columns:repeat(8,1fr);align-items:center;text-align:center;font-weight:600;color:#3d4650}.board{grid-column:2;grid-row:1;width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);border:1px solid #66715f;box-shadow:0 2px 10px rgba(0,0,0,.10)}.sq{position:relative;display:flex;align-items:center;justify-content:center;border:0;border-radius:0;padding:0;overflow:hidden;font-size:clamp(42px,5.4vw,72px);line-height:1;user-select:none}.sq.light{background:#eeeccf}.sq.dark{background:#779556}.sq:disabled{opacity:1;cursor:default}.sq:not(:disabled){cursor:pointer}.sq.selected{box-shadow:inset 0 0 0 6px rgba(255,211,0,.9)}.piece{font-family:"DejaVu Sans","Arial Unicode MS",sans-serif;pointer-events:none;line-height:1}.white-piece{color:#f7f7f7;text-shadow:0 0 1px #111,0 1px 1px #111}.black-piece{color:#171717;text-shadow:0 1px 0 rgba(255,255,255,.25)}.timers{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}.timers>div{background:#eef5fb;border:1px solid #dfe8f0;border-radius:14px;padding:16px 20px}.timers small{display:block;color:#526273;margin-bottom:4px}.timers strong{font-size:30px;font-variant-numeric:tabular-nums}.panel{background:#fff;border:1px solid #e0e2e4;border-radius:14px;padding:22px;box-shadow:0 1px 3px rgba(0,0,0,.03)}.panel button{width:100%;font-size:17px}.stepname{color:#657080}.stepper{display:flex;gap:8px;justify-content:space-between;margin-top:18px;background:#fff;border:1px solid #e0e2e4;border-radius:14px;padding:18px 12px}.stepdot{flex:1;text-align:center;color:#737b84}.stepdot span{display:flex;margin:0 auto 8px;width:38px;height:38px;border-radius:50%;align-items:center;justify-content:center;background:#e1e5e9}.stepdot.active span{background:#1769c2;color:#fff}.stepdot.done span{background:#9fc4e9;color:#173f69}.stepdot small{font-size:11px;display:block}.notation{margin:12px 0 0 26px;color:#657080;font-size:12px}.notation code{display:block;padding:8px 0;overflow-wrap:anywhere}.parent-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.metric{padding:14px;border:1px solid #ddd;border-radius:10px}table{border-collapse:collapse;width:100%;margin:10px 0}th,td{border-bottom:1px solid #ddd;text-align:left;padding:8px}@media(max-width:980px){main{padding:20px}.training-layout{grid-template-columns:1fr}.board-shell{width:min(680px,100%)}.stepper{overflow-x:auto}.stepdot{min-width:90px}}@media(max-width:650px){main{padding:14px}.cards{grid-template-columns:1fr}.rank-axis{font-size:12px}.file-axis{font-size:12px}.board-shell{grid-template-columns:20px 1fr;grid-template-rows:1fr 22px}.timers strong{font-size:23px}}
.phase-banner{display:flex;gap:14px;align-items:center;padding:12px 16px;border-radius:12px;margin:0 0 18px;font-size:15px}.phase-banner b{letter-spacing:.08em}.phase-banner.learn{background:#e9f3ff;border:1px solid #c9def4}.phase-banner.practice{background:#fff5d9;border:1px solid #ead59a}.phase-banner.test{background:#f0edf9;border:1px solid #d8d0ed}.phase-banner.recap{background:#eaf6ec;border:1px solid #cce3d0}.feedback{padding:14px 16px;border-radius:10px;margin:16px 0;line-height:1.45}.feedback.neutral{background:#f4f5f6}.feedback.correct{background:#e5f5e8;border:1px solid #b9dfc0}.feedback.wrong{background:#fff0ee;border:1px solid #efc5bf}.feedback.hint{background:#fff6dc;border:1px solid #ead89b}.secondary{background:#fff!important;color:#222!important;border:1px solid #aeb5bc!important;margin-bottom:10px}.recap-card{max-width:760px;margin:40px auto}
/* V3.1 visual refresh: presentation only; training persistence and board logic unchanged. */
:root{background:#f4f7fb;color:#17233b}body{background:linear-gradient(180deg,#f7faff 0,#f5f7fa 42%,#f7f7f4 100%)}main{max-width:1480px;padding:30px 42px 46px}h1,h2,h3{color:#14233f;letter-spacing:-.02em}button,.cards a{background:linear-gradient(135deg,#2877d4,#4b8fe2);box-shadow:0 6px 16px rgba(39,105,190,.16);font-weight:700;transition:transform .12s ease,box-shadow .12s ease,filter .12s ease}button:hover,.cards a:hover{filter:brightness(1.03);box-shadow:0 8px 20px rgba(39,105,190,.22)}button:active,.cards a:active{transform:translateY(1px)}button:disabled{filter:grayscale(.25);opacity:.65;cursor:default}.training-layout{grid-template-columns:minmax(540px,660px) minmax(440px,1fr);gap:42px}.board-shell{background:#fff;padding:14px 14px 8px 8px;border:1px solid #e1e7ef;border-radius:18px;box-shadow:0 10px 28px rgba(27,46,76,.09)}.board{border:1px solid #65745d;box-shadow:none}.panel{border:1px solid #dfe6ef;border-radius:18px;padding:26px 28px;box-shadow:0 8px 26px rgba(28,48,80,.07)}.learning-panel h2{font-size:30px;margin-top:12px}.learning-prompt{font-size:17px;line-height:1.6;margin:20px 0 24px}.feedback{margin:24px 0 0;padding:17px 19px;border-radius:13px;font-size:16px}.feedback.neutral{background:linear-gradient(135deg,#f0f6ff,#f7faff);border:1px solid #d5e5f7;color:#314b6c}.feedback.correct{background:linear-gradient(135deg,#e9f8ed,#f3fbf5);border:1px solid #bfe3c8;color:#245b34}.feedback.wrong{background:linear-gradient(135deg,#fff0ee,#fff7f5);border:1px solid #efc5bf;color:#7b332b}.primary-action{margin-top:18px}.module-title{display:flex;align-items:center;gap:14px;margin:18px 0 20px;padding:0 4px}.module-title b{font-size:13px;letter-spacing:.08em;color:#2877d4}.module-title span{font-weight:700;color:#33445f}.phase-nav{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 18px}.phase-tab{position:relative;display:flex;flex-direction:column;gap:3px;min-height:70px;padding:14px 18px;border:1px solid #dfe6ef;border-radius:16px;background:rgba(255,255,255,.8);color:#6b778b;box-shadow:0 4px 14px rgba(27,46,76,.04)}.phase-tab b{font-size:14px}.phase-tab span{font-size:12px}.phase-tab.active{background:linear-gradient(135deg,#347be0,#5a95e8);border-color:transparent;color:#fff;box-shadow:0 8px 22px rgba(49,116,213,.22)}.timers>div{background:linear-gradient(135deg,#eef6ff,#f7faff);border-color:#dce8f5}.stepper{border-radius:18px;box-shadow:0 5px 18px rgba(28,48,80,.05)}.stepdot.active span{background:linear-gradient(135deg,#2877d4,#4b8fe2)}textarea,input,select{border-color:#cfd9e6;box-shadow:inset 0 1px 2px rgba(30,50,80,.02)}textarea:focus,input:focus,select:focus{outline:3px solid rgba(52,123,224,.12);border-color:#6d9ddd}.secondary{background:#f7f9fc!important;color:#33445f!important;border:1px solid #d6dee9!important;box-shadow:none!important}@media(max-width:980px){.phase-nav{grid-template-columns:1fr 1fr}.training-layout{grid-template-columns:1fr}}@media(max-width:650px){main{padding:16px}.phase-nav{gap:8px}.phase-tab{padding:11px 12px;min-height:62px}.learning-panel h2{font-size:25px}.board-shell{padding:8px 8px 5px 4px}}
.retry-note{margin-top:12px;padding:10px 12px;border-radius:10px;background:#fff7df;border:1px solid #ead9a6;color:#66511e}.answer-reveal{margin-top:12px;padding-top:12px;border-top:1px solid rgba(0,0,0,.1)}
/* V3.3 navigation and curriculum UI. Functional board/tracking rules remain unchanged. */
.training-page{background:#f4f7fb}.app-frame{min-height:100vh;display:grid;grid-template-columns:300px minmax(0,1fr)}.child-sidebar{position:sticky;top:0;height:100vh;overflow:auto;background:#10213e;color:#dbe7f8;padding:26px 20px;border-right:1px solid rgba(255,255,255,.06)}.sidebar-brand{display:flex;align-items:center;gap:12px;padding:0 4px 24px;border-bottom:1px solid rgba(255,255,255,.10)}.brand-mark{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#3c83e6,#63a0ec);color:#fff;font-weight:800}.sidebar-brand b{display:block;color:#fff}.sidebar-brand small{display:block;color:#8fa6c6;margin-top:2px}.sidebar-data{padding-top:20px}.player-mini{padding:0 5px 18px}.player-mini>small,.side-heading{font-size:11px;letter-spacing:.11em;font-weight:800;color:#7993b8}.player-mini>strong{display:block;color:#fff;font-size:24px;margin:5px 0 9px}.player-mini div{display:flex;align-items:center;gap:8px;color:#a9bbd4;font-size:12px}.player-mini div b{color:#fff;font-size:16px}.player-mini .target{margin-left:auto;background:rgba(255,255,255,.08);padding:4px 7px;border-radius:8px}.side-nav{display:grid;gap:6px;margin-bottom:24px}.side-nav a{color:#b9c9de;text-decoration:none;padding:11px 12px;border-radius:10px;font-weight:650}.side-nav a.active,.side-nav a:hover{background:rgba(80,145,232,.16);color:#fff}.journey{scroll-margin-top:20px}.journey-module{margin:10px 0 18px}.journey-module>b{display:block;color:#edf4ff;font-size:13px;margin:0 5px 9px}.journey-level{display:grid;grid-template-columns:12px 1fr;gap:9px;padding:9px 8px;border-radius:10px;color:#aabbd2}.journey-level.current{background:rgba(68,137,229,.15);color:#fff}.journey-level strong{display:block;font-size:12px;line-height:1.3}.journey-level small{display:block;font-size:11px;color:#8199b9;margin-top:3px}.journey-level.current small{color:#b8d2f4}.level-dot{width:8px;height:8px;border-radius:50%;background:#506680;margin-top:4px}.level-dot.done{background:#55c58a}.side-history{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;margin-top:10px}.history-row{display:flex;justify-content:space-between;padding:7px 5px;color:#9eb1ca;font-size:12px}.history-row b{color:#e9f2ff}.training-main{max-width:none;margin:0;padding:30px 38px 48px}.training-main #app{max-width:1420px;margin:0 auto}.home-main{max-width:1180px;padding-top:54px}.home-hero{display:flex;align-items:flex-start;justify-content:space-between;gap:30px}.eyebrow{font-size:12px;letter-spacing:.12em;font-weight:800;color:#2d76d1}.home-hero h1{font-size:40px;margin:8px 0}.home-hero p{color:#61708a}.parent-link{color:#5f6f87;text-decoration:none;font-weight:650;padding:10px 12px}.home-status{display:grid;grid-template-columns:180px 180px 1fr;gap:14px;margin:42px 0 18px}.status-card{background:#fff;border:1px solid #e0e7f0;border-radius:18px;padding:20px;box-shadow:0 8px 24px rgba(28,48,80,.05)}.status-card small,.status-card span{display:block;color:#708099}.status-card strong{display:block;font-size:30px;color:#14233f;margin:6px 0}.status-card.wide strong{font-size:22px}.continue-card{display:flex;justify-content:space-between;align-items:center;text-decoration:none;background:linear-gradient(135deg,#2877d4,#4b8fe2);color:#fff;padding:24px 28px;border-radius:20px;box-shadow:0 12px 28px rgba(39,105,190,.18)}.continue-card span>*{display:block}.continue-card small{letter-spacing:.1em;opacity:.8;font-weight:800}.continue-card b{font-size:25px;margin:5px 0}.continue-card em{font-style:normal;opacity:.82}.continue-card>strong{font-size:38px}.empty-state{max-width:720px;margin:90px auto;padding:38px}.empty-state h2{font-size:30px}@media(max-width:1120px){.app-frame{grid-template-columns:250px minmax(0,1fr)}.training-main{padding:24px}.training-layout{grid-template-columns:1fr}.home-status{grid-template-columns:1fr 1fr}.status-card.wide{grid-column:1/-1}}@media(max-width:760px){.app-frame{display:block}.child-sidebar{position:relative;height:auto;padding:16px}.journey,.side-history{display:none}.sidebar-brand{padding-bottom:14px}.player-mini{padding-bottom:8px}.side-nav{display:flex;margin:0}.training-main{padding:16px}.home-hero{display:block}.parent-link{display:inline-block;padding-left:0}.home-status{grid-template-columns:1fr}.status-card.wide{grid-column:auto}}
.reset-zone{margin-top:32px;border:1px solid #f1c7c7;background:#fffafa;padding:20px;border-radius:16px}.reset-zone input{margin-top:8px;max-width:260px}.danger-btn{background:linear-gradient(135deg,#b42318,#d92d20)!important;color:#fff!important}.danger-btn:hover{filter:brightness(.96)}