:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#0b1d55;background:#f9f7ff;--brand:#b58cff;--brand-strong:#8b5cf6;--brand-deep:#7047e8;--brand-soft:#f0e9ff;--brand-soft-2:#e4d6ff;--navy:#0a1e58;--navy-soft:#33436e;--muted:#78819a;--line:#d8d9e6;--line-strong:#47577d;--danger:#ef4b57;--green:#25b86a;--amber:#f3a70a;--red:#ef4936;--shadow:0 12px 35px rgba(61,42,124,.12);--shadow-soft:0 7px 22px rgba(61,42,124,.10)}
*{box-sizing:border-box}html,body,#app{min-height:100%;margin:0}body{background:radial-gradient(circle at 82% 12%,rgba(181,140,255,.17),transparent 28%),radial-gradient(circle at 12% 68%,rgba(181,140,255,.10),transparent 28%),var(--tg-theme-bg-color,#f9f7ff);overscroll-behavior:none}button{font:inherit;-webkit-tap-highlight-color:transparent}button,[role=button]{touch-action:manipulation}.hidden{display:none!important}
.app-shell,.app{width:min(100%,760px);min-height:100dvh;margin:0 auto;padding:max(10px,env(safe-area-inset-top)) 14px max(14px,env(safe-area-inset-bottom));color:var(--navy);user-select:none}.app{background:transparent}.topbar{min-height:52px;display:flex;align-items:center;justify-content:space-between;gap:12px}.topbar>span{flex:1;text-align:center;font-size:18px;font-weight:800;color:#111}.top-actions{display:flex;align-items:center;gap:12px}.top-actions button,.top-actions span{border:0;background:transparent;color:var(--navy-soft);font-size:25px}
svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.menu-screen{padding-bottom:28px}.menu-hero{position:relative;margin:4px auto 14px;min-height:230px;display:grid;place-items:center}.menu-hero:before,.menu-hero:after{content:"✦";position:absolute;color:rgba(181,140,255,.54);font-size:25px}.menu-hero:before{right:3%;top:18%}.menu-hero:after{left:4%;bottom:8%;font-size:17px}.brand-lockup{width:min(100%,650px);display:grid;grid-template-columns:minmax(112px,34%) 1fr;align-items:center;gap:16px;padding:4px 8px}.brand-icon{width:100%;aspect-ratio:1;object-fit:cover;border-radius:26%;box-shadow:0 16px 34px rgba(82,52,159,.16)}.brand-copy{min-width:0}.brand-title{margin:0;color:var(--navy);font-weight:900;font-size:clamp(33px,9vw,66px);line-height:.92;letter-spacing:-.055em}.brand-title span{color:var(--brand-strong)}.brand-subtitle{margin:12px 0 0;font-size:clamp(14px,3.7vw,20px);color:var(--navy-soft);font-weight:650}.brand-subtitle b{color:var(--brand-strong)}
.score-card{display:grid;grid-template-columns:74px 1fr 48px;align-items:center;gap:16px;min-height:126px;padding:19px 22px;border:1px solid rgba(181,140,255,.23);border-radius:29px;background:linear-gradient(135deg,rgba(255,255,255,.96),rgba(247,243,255,.92));box-shadow:var(--shadow)}.score-emblem,.score-star{display:grid;place-items:center;color:var(--brand-deep);background:var(--brand-soft);border:2px solid rgba(181,140,255,.25)}.score-emblem{width:70px;height:70px;border-radius:50%;padding:17px}.score-star{width:48px;height:48px;border-radius:15px;padding:12px}.score-label{color:var(--muted);font-size:17px;font-weight:600}.score-value{font-size:clamp(38px,10vw,62px);font-weight:900;line-height:1;letter-spacing:-.035em;margin-top:3px}.menu-section-title{margin:24px 4px 13px;font-size:clamp(22px,5.8vw,30px);font-weight:900;letter-spacing:-.025em}
.mode-switch{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px;padding:5px;border:1px solid rgba(181,140,255,.18);border-radius:23px;background:rgba(255,255,255,.74);box-shadow:var(--shadow-soft)}.mode-card{min-width:0;min-height:82px;border:0;border-radius:18px;background:transparent;color:var(--navy-soft);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:8px 4px}.mode-card.selected{color:var(--brand-deep);background:linear-gradient(135deg,rgba(255,255,255,.98),rgba(240,233,255,.94));box-shadow:inset 0 0 0 1px rgba(139,92,246,.45)}.mode-icon{width:27px;height:27px;margin-bottom:5px}.mode-name{font-size:14px;font-weight:900;line-height:1.05;text-align:center}.mode-desc{font-size:9px;color:var(--muted);margin-top:5px;text-align:center;line-height:1.1}
.difficulty-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.difficulty-card{position:relative;min-height:108px;padding:16px;border:1px solid rgba(20,33,79,.07);border-radius:24px;background:rgba(255,255,255,.88);box-shadow:var(--shadow-soft);color:var(--navy);display:grid;grid-template-columns:54px 1fr;gap:13px;align-items:center;text-align:left}.difficulty-card.selected{border:2px solid var(--brand-strong);background:linear-gradient(135deg,rgba(255,255,255,.98),rgba(240,233,255,.93));box-shadow:0 10px 30px rgba(126,78,239,.20)}.difficulty-check{position:absolute;top:10px;right:10px;width:27px;height:27px;display:grid;place-items:center;border-radius:50%;background:var(--brand-deep);color:#fff;font-weight:900;font-size:15px}.difficulty-icon{width:54px;height:54px;border-radius:50%;padding:14px;display:grid;place-items:center}.difficulty-icon.easy{color:var(--green);background:rgba(37,184,106,.12)}.difficulty-icon.medium{color:var(--amber);background:rgba(243,167,10,.13)}.difficulty-icon.strong{color:var(--red);background:rgba(239,73,54,.12)}.difficulty-icon.extreme{color:var(--brand-deep);background:rgba(181,140,255,.18)}.difficulty-copy{min-width:0;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.difficulty-name{font-size:18px;font-weight:900;line-height:1.08}.difficulty-desc{color:var(--muted);font-size:14px;margin-top:6px;line-height:1.18}.local-note{margin-top:15px;padding:18px 20px;border-radius:22px;background:#fff;border:1px solid rgba(181,140,255,.28);color:var(--navy-soft);font-size:14px;line-height:1.45;box-shadow:var(--shadow-soft)}
.primary-action,.primary{width:100%;min-height:72px;margin-top:18px;border:0;border-radius:23px;color:#fff;background:linear-gradient(110deg,var(--brand-strong),var(--brand));box-shadow:0 13px 30px rgba(126,78,239,.28);display:flex;align-items:center;justify-content:center;gap:12px;font-size:clamp(21px,5.8vw,29px);font-weight:900}.primary-action .mini-icon{width:28px;height:28px}.secondary-actions,.secondary-row{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin-top:14px}.secondary-action,.secondary{min-height:70px;border:1px solid rgba(20,33,79,.07);border-radius:22px;background:rgba(255,255,255,.88);color:var(--navy);box-shadow:var(--shadow-soft);display:flex;align-items:center;justify-content:center;gap:10px;font-weight:800}.secondary-action:disabled,.secondary:disabled{opacity:.42}.secondary-action .mini-icon{width:36px;height:36px;padding:8px;border-radius:50%;background:var(--brand-soft);color:var(--brand-deep)}.menu-tip,.footer{margin:18px 6px 0;display:flex;justify-content:center;align-items:center;gap:9px;color:var(--muted);font-size:13px;text-align:center}.menu-tip .mini-icon{width:30px;height:30px;padding:7px;border-radius:50%;background:var(--brand-soft);color:var(--brand-deep);flex:0 0 auto}
/* GAME */.game-head{display:grid;grid-template-columns:minmax(88px,1fr) minmax(126px,1.25fr) minmax(88px,1fr);align-items:center;gap:8px;margin:7px 0 12px}.hint-pill{background:var(--brand-soft);border-radius:18px;padding:12px 8px;font-weight:800;color:#4a3c78;text-align:center;font-size:13px}.game-score{text-align:center;min-width:0}.game-score b{display:block;color:var(--brand-deep);font-size:clamp(30px,8vw,40px);line-height:1}.game-score span{display:block;font-size:14px;font-weight:800;margin-top:5px}.timer-wrap{text-align:right;font-size:20px;font-weight:900;white-space:nowrap}.pause-btn{margin-left:6px;border:0;width:46px;height:46px;padding:9px;border-radius:16px;background:var(--brand-soft);color:var(--brand-deep)}.player-card{display:flex;align-items:center;gap:13px;padding:12px 16px;margin:9px 0;border-radius:22px;background:#fff;border:1px solid rgba(181,140,255,.20);box-shadow:var(--shadow-soft)}.avatar{width:52px;height:52px;border-radius:15px;background:linear-gradient(135deg,#dfe5f8,#313b69);display:grid;place-items:center;font-size:35px}.player-name{font-size:21px;font-weight:900}.player-level{color:var(--muted);font-size:14px}.clock{margin-left:auto;border-radius:17px;background:var(--brand-soft);color:#5c3aa1;padding:12px 15px;font-size:19px;font-weight:900;white-space:nowrap;transition:.18s ease}.clock.active{box-shadow:inset 0 0 0 2px var(--brand-strong),0 5px 16px rgba(126,78,239,.18);background:#eee4ff}
.board-shell{width:100%;max-width:620px;margin:10px auto;padding:7px;border-radius:22px;background:#fff;border:1px solid rgba(181,140,255,.25);box-shadow:var(--shadow-soft)}.board{width:100%;aspect-ratio:1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));overflow:hidden;border:2px solid var(--line-strong);background:#fff}.sq{appearance:none;border:0;padding:0;margin:0;min-width:0;min-height:0;width:100%;height:100%;position:relative;display:grid;place-items:center;line-height:1;overflow:hidden}.sq.light{background:#fff9ec}.sq.dark{background:#d7d8ea}.sq.selected{box-shadow:inset 0 0 0 3px var(--brand-deep);background:#e8dcff}.sq.last{background:#e9ddff}.piece{font-family:"Segoe UI Symbol","Noto Sans Symbols 2",serif;display:block;font-size:clamp(28px,9.4vw,58px);line-height:1;pointer-events:none}.piece.white{color:#fff;text-shadow:0 0 1px #071d57,1px 1px 0 #071d57,-1px -1px 0 #071d57,0 2px 4px rgba(3,20,60,.45)}.piece.black{color:#071d57;text-shadow:0 2px 5px rgba(0,0,0,.28)}.dot{position:absolute;width:22%;aspect-ratio:1;border-radius:50%;background:rgba(145,92,246,.50)}.capture-dot{position:absolute;inset:12%;border:4px solid rgba(145,92,246,.58);border-radius:50%}.coord{position:absolute;font-size:8px;font-weight:800;color:#65708d;line-height:1}.rank{left:2px;top:2px}.file{right:3px;bottom:2px}.turn-card{display:flex;align-items:center;justify-content:center;gap:10px;margin:10px auto;padding:13px 16px;max-width:620px;border-radius:18px;background:#fff;border:1px solid rgba(181,140,255,.28);box-shadow:var(--shadow-soft);font-weight:900}.turn-dot{width:18px;height:18px;border-radius:50%;border:2px solid #23345f}.turn-dot.white{background:#fff}.turn-dot.black{background:#0b235f}.turn-label{font-size:17px}.captured{display:flex;align-items:center;justify-content:space-between;padding:10px 13px;margin:10px 0;border-radius:18px;background:#fff;border:1px solid #eee7ff;min-height:48px}.captured-pieces{font-size:22px;letter-spacing:-4px}.moves-mini{display:flex;gap:6px;overflow:hidden;min-width:0}.move-pill{padding:7px 9px;border-radius:12px;border:1px solid #e3d8ff;background:#fff;color:#66708c;font-size:11px;white-space:nowrap}.controls{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px;margin:11px 0}.ctrl{border:1px solid rgba(20,33,79,.07);background:rgba(255,255,255,.90);border-radius:18px;padding:10px 2px;color:var(--navy-soft);min-height:78px;box-shadow:var(--shadow-soft)}.tool-icon{display:block;width:31px;height:31px;margin:0 auto;color:var(--brand-deep)}.ctrl span:last-child{display:block;font-size:10px;margin-top:8px}.draw-btn{margin-top:8px}.modal-backdrop{position:fixed;inset:0;background:rgba(14,18,47,.68);display:flex;align-items:center;justify-content:center;padding:22px;z-index:10}.modal{width:min(430px,100%);max-height:88vh;overflow:auto;background:#fff;border-radius:28px;padding:24px;box-shadow:0 20px 70px rgba(0,0,0,.3)}.modal h2{text-align:center;font-size:27px;margin:0 0 18px}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat{background:#faf8ff;border:1px solid #e9dfff;border-radius:19px;padding:16px;text-align:center}.stat b{font-size:27px;color:var(--brand-deep)}.stat small{display:block;color:var(--muted);margin-top:5px}.history{max-height:220px;overflow:auto;margin-top:14px}.history-row{display:grid;grid-template-columns:30px 1fr 1fr;padding:8px;border-bottom:1px solid #eee}
@media(max-width:430px){.app-shell,.app{padding-left:10px;padding-right:10px}.menu-hero{min-height:190px}.brand-lockup{grid-template-columns:minmax(105px,32%) 1fr;gap:12px}.brand-title{font-size:clamp(32px,10vw,43px)}.brand-subtitle{font-size:13px}.score-card{grid-template-columns:62px 1fr 46px;min-height:112px;padding:17px}.score-emblem{width:62px;height:62px;padding:15px}.mode-name{font-size:12px}.mode-desc{font-size:8px}.difficulty-card{padding:14px 12px;grid-template-columns:50px 1fr;gap:10px}.difficulty-icon{width:50px;height:50px;padding:13px}.difficulty-name{font-size:16px}.difficulty-desc{font-size:12px}.controls{gap:5px}.ctrl{min-height:74px}.piece{font-size:min(10.6vw,52px)}.game-head{grid-template-columns:88px 1fr 88px}.timer-wrap{font-size:17px}.pause-btn{width:40px;height:40px}.clock{font-size:16px;padding:10px}.player-card{padding:10px 12px}.avatar{width:46px;height:46px}.player-name{font-size:19px}}

/* v4: responsive AI and cleaner board rotation control */
.board-shell{position:relative}
.board-shell.thinking .board{filter:saturate(.82);pointer-events:none}
.thinking-overlay{position:absolute;inset:7px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;border-radius:16px;background:rgba(249,247,255,.76);backdrop-filter:blur(2px);color:var(--navy);z-index:4}
.thinking-spinner{width:36px;height:36px;border-radius:50%;border:4px solid rgba(145,92,246,.18);border-top-color:var(--brand-deep);animation:chess-spin .72s linear infinite}
@keyframes chess-spin{to{transform:rotate(360deg)}}
#flip .tool-icon{width:29px;height:29px}
#flip .tool-icon svg{stroke-linecap:round;stroke-linejoin:round}
.engine-retry{display:block;width:calc(100% - 24px);margin:10px auto 0;border:0;border-radius:16px;padding:13px 16px;background:#fff0f1;color:#9d3440;font:800 15px/1.2 inherit;box-shadow:inset 0 0 0 1px rgba(157,52,64,.12)}

/* v6.3: local chess clocks */
.clock-title{margin-top:18px}
.clock-options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}
.clock-option{min-height:48px;border:1px solid rgba(20,33,79,.08);border-radius:16px;background:rgba(255,255,255,.88);color:var(--navy);font:800 13px/1.15 inherit;box-shadow:var(--shadow-soft);padding:8px 5px}
.clock-option.selected{border:2px solid var(--brand-strong);background:linear-gradient(135deg,#fff,#efe6ff);color:var(--brand-deep)}
.clock.countdown{font-variant-numeric:tabular-nums;letter-spacing:.02em}
.clock.countdown.active{background:linear-gradient(135deg,#7e4eef,#a777ff);color:#fff;box-shadow:0 7px 18px rgba(126,78,239,.28)}
@media(max-width:430px){.clock-options{grid-template-columns:repeat(2,minmax(0,1fr))}.clock-option{min-height:44px}}