:root { color-scheme: dark; --bg:#050b1a; --bg2:#07122a; --panel:#0d1c3f; --panel2:#11285c; --line:#2a56b5; --line-soft:#1a3c83; --ink:#ffffff; --muted:#b9c9e6; --cyan:#5fd4ff; --cyan-2:#4aa8ff; --yellow:#ffd84d; --yellow-hot:#ffee58; --yellow-deep:#b78600; --red:#ff4d6d; --red-hot:#ff6f86; --red-deep:#951a39; --shadow:#020814; }
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:radial-gradient(circle at 15% 10%,#163a8a55 0%,transparent 30%),radial-gradient(circle at 85% 0%,#1d4ed855 0%,transparent 26%),radial-gradient(circle at 50% 120%,#0ea5e933 0%,transparent 28%),linear-gradient(180deg,var(--bg2) 0%,var(--bg) 55%,#040814 100%);min-height:100vh}
button{font:inherit;cursor:pointer;transition:background .18s,border-color .18s,transform .18s;touch-action:manipulation}
button:focus-visible,a:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;box-shadow:0 0 0 6px #5fd4ff22}
button:disabled{opacity:.38;cursor:not-allowed}
.page{max-width:1270px;margin:auto;padding:0 25px}
.topbar{height:95px;border-bottom:1px solid #1e4ea0;display:flex;justify-content:space-between;align-items:center;box-shadow:0 1px 0 #58c8ff22}
.brand{text-decoration:none;color:var(--ink);font-weight:850;letter-spacing:-1.1px;font-size:25px;display:flex;align-items:center;gap:13px}
.brand strong{color:var(--cyan);text-shadow:0 0 12px #5fd4ff88}
.brand-glyph{width:35px;height:35px;display:grid;grid-template-columns:repeat(2,13px);grid-template-rows:repeat(2,13px);gap:4px;transform:rotate(-10deg)}
.brand-glyph i{background:radial-gradient(circle at 30% 28%,#fff9bd 0%,var(--yellow-hot) 28%,var(--yellow) 58%,#d7a100 84%,#7f5b00 100%);border-radius:50%;border:1px solid #fff2a4;box-shadow:inset 0 2px 4px #fff8,inset 0 -4px 8px #0006,0 0 12px #ffe34f88,0 0 22px #ffd84d55}
.brand-glyph i:nth-child(2),.brand-glyph i:nth-child(3){background:radial-gradient(circle at 30% 28%,#ffd3d6 0%,var(--red-hot) 28%,var(--red) 58%,#b71c4c 84%,#5d0d28 100%);border-color:#ff9fb1;box-shadow:inset 0 2px 4px #fff7,inset 0 -4px 8px #0006,0 0 12px #ff5d7a88,0 0 22px #ff4d6d55}
.top-tag{font-size:10px;letter-spacing:2px;font-weight:800;color:#d8e6ff;display:flex;align-items:center;gap:10px}
.live-dot,.online-pulse{height:8px;width:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px #5fd4ff,0 0 20px #5fd4ff88;display:inline-block}
.beta-tag{border:1px solid #2f6ee4;border-radius:6px;letter-spacing:0;padding:4px 6px;color:#d5e6ff;background:#0e234d}
.heading{text-align:center;padding:40px 0 38px}
.eyebrow,.overline,.setting-label{color:var(--cyan);font-size:11px;letter-spacing:2.4px;font-weight:800;text-shadow:0 0 10px #5fd4ff66}
.heading h1{font-size:clamp(32px,4.4vw,58px);line-height:1.14;letter-spacing:-2.2px;margin:13px auto}
.heading h1 span{color:var(--yellow-hot);text-shadow:0 0 12px #ffe95f88}
.heading p{font-size:14px;line-height:1.7;color:#d4e0f5;max-width:570px;margin:17px auto 0}
.layout{display:grid;grid-template-columns:minmax(0,760px) minmax(270px,1fr);gap:22px;align-items:start}
.game-card,.side-card{background:linear-gradient(165deg,#0b1735 0%,#11244f 45%,#0a1630 100%);border:1px solid #2a56b5;border-radius:20px;box-shadow:0 0 0 1px #4aa8ff22,0 18px 40px #010611,0 0 28px #1d4ed833}
.game-card{padding:26px 27px 24px}
.mode-group{display:flex;gap:5px;padding:5px;background:#07142e;border:1px solid #204890;border-radius:12px;box-shadow:inset 0 0 14px #4aa8ff14}
.mode{border:0;flex:1;min-height:40px;border-radius:8px;background:transparent;color:#d9e6ff;font-size:12px;font-weight:750;padding:8px 10px}
.mode.active{background:linear-gradient(180deg,#153b7a,#102a59);color:white;box-shadow:0 0 0 1px #4aa8ff66,0 0 16px #4aa8ff33}
.mode:hover:not(.active){background:#102444}
.settings-row{display:flex;justify-content:space-between;align-items:flex-end;gap:15px;margin:23px 0}
.setting{display:flex;flex-direction:column;gap:9px}
.setting-label{color:#b9cff7;font-size:10px;letter-spacing:1.5px}
.choice-row{display:flex;gap:5px}
.chip{padding:8px 13px;background:linear-gradient(180deg,#0c1f45,#0a1734);border:1px solid #2b5dbe;border-radius:8px;color:#e5efff;font-size:12px;font-weight:750;min-width:53px;box-shadow:inset 0 1px 0 #8fbbff18}
.chip.active{background:linear-gradient(180deg,#123a7a,#0d2b5b);border-color:#5fd4ff;color:#ffffff;box-shadow:0 0 14px #5fd4ff33}
.chip:hover{border-color:var(--cyan);box-shadow:0 0 10px #5fd4ff22}
.game-state{display:flex;justify-content:space-between;gap:8px;align-items:center;background:linear-gradient(180deg,#09162f,#0d1f42);border:1px solid #2553a8;border-radius:14px;padding:16px 16px;margin:17px 0 22px;box-shadow:inset 0 0 16px #4aa8ff12}
.player{display:flex;align-items:center;gap:10px;min-width:125px;opacity:.65}
.player.is-turn{opacity:1}
.player.red{justify-content:flex-end;text-align:right;flex-direction:row-reverse}
.player-disc{width:29px;height:29px;border-radius:50%;background:radial-gradient(circle at 30% 25%,#fffad1 0%,var(--yellow-hot) 22%,var(--yellow) 52%,#d0a11f 76%,#795400 100%);border:2px solid #fff1a8;box-shadow:inset 0 2px 5px #fff9,inset 0 -6px 10px #0005,0 0 14px #ffe34f88,0 3px 16px #0007;flex-shrink:0}
.player.red .player-disc{background:radial-gradient(circle at 30% 25%,#ffd5dc 0%,var(--red-hot) 22%,var(--red) 52%,#b31b4b 76%,#5d0d28 100%);border-color:#ffb0bf;box-shadow:inset 0 2px 5px #fff8,inset 0 -6px 10px #0005,0 0 14px #ff617d88,0 3px 16px #0007}
.player-name{display:block;font-size:11px;letter-spacing:.8px;font-weight:850}
.player-sub{display:block;color:#d4e1f9;font-size:10px;margin-top:3px;white-space:nowrap}
.state-center{text-align:center;display:flex;flex-direction:column;gap:4px;align-items:center;max-width:220px}
.state-tag{color:var(--cyan);font-size:9px;letter-spacing:1.5px;font-weight:850}
.state-center strong{font-size:17px;letter-spacing:-.4px;color:#fff}
.status-caption{font-size:10px;color:#d4e1f9}
.board-wrap{display:flex;justify-content:center;padding:0 5px}
.board{--size:4;display:grid;grid-template-columns:repeat(var(--size),minmax(0,1fr));width:min(100%,490px);gap:clamp(6px,1.1vw,11px);padding:clamp(10px,1.9vw,19px);background:linear-gradient(145deg,#13306a,#0f2351 42%,#0a1634 100%);border:1px solid #4aa8ff;border-radius:20px;box-shadow:inset 0 2px 12px #7cc2ff22,inset 0 -3px 8px #0008,0 0 18px #1d4ed844,0 20px 40px #070e1e55}
.cell{aspect-ratio:1;background:linear-gradient(180deg,#09162d,#0f2143);border:1px solid #2f69cc;border-radius:14px;display:flex;align-items:center;justify-content:center;padding:10%;box-shadow:inset 0 4px 10px #02091399, inset 0 -2px 8px #5fd4ff10;position:relative}
.cell:hover:not(:disabled){background:linear-gradient(180deg,#102756,#163369);border-color:#74d8ff;transform:translateY(-1px);box-shadow:0 0 12px #5fd4ff22,inset 0 4px 10px #02091399}
.cell:disabled{opacity:1;cursor:default}
.cell .disc{display:block;width:100%;height:100%;border-radius:50%;box-shadow:inset 0 3px 10px #fff7,inset 0 -8px 14px #0007,0 0 12px #0006,0 6px 14px #0007}
.cell.yellow .disc{background:radial-gradient(circle at 30% 24%,#fffad7 0%,#fff38a 16%,var(--yellow-hot) 34%,var(--yellow) 58%,#d7a100 78%,#6d4e00 100%);border:2px solid #fff1aa}
.cell.red .disc{background:radial-gradient(circle at 30% 24%,#ffe0e5 0%,#ff9cab 16%,var(--red-hot) 34%,var(--red) 58%,#b51647 78%,#540b24 100%);border:2px solid #ffb3c1}
.cell.selectable:after{content:'';position:absolute;inset:4px;border:2px dashed var(--cyan);border-radius:11px;pointer-events:none;box-shadow:0 0 12px #5fd4ff44}
.cell.selected{outline:3px solid var(--cyan);outline-offset:-3px;box-shadow:0 0 18px #5fd4ff66,inset 0 4px 10px #02091399}
.cell.destination{background:linear-gradient(180deg,#12304f,#18456d);border-color:var(--cyan);box-shadow:0 0 16px #5fd4ff22}
.cell.destination:before{content:'';height:24%;width:24%;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px #5fd4ff,0 0 20px #5fd4ff88}
.cell.win{background:linear-gradient(180deg,#17345e,#194874);border-color:#ffe45d;box-shadow:inset 0 1px 12px #fff38a55,0 0 16px #ffe45d55}
.actions{display:flex;gap:12px;justify-content:center;margin-top:24px}
.shift-button,.reset-button,.primary,.outline{border:1px solid #2f66d1;border-radius:10px;font-size:12px;font-weight:800;min-height:43px;padding:11px 15px;box-shadow:0 0 0 1px #4aa8ff12,inset 0 1px 0 #ffffff12}
.shift-button{background:linear-gradient(180deg,#143770,#0f2a57);color:#fff;min-width:215px;text-shadow:0 1px 0 #0008}
.shift-button.active{border-color:var(--cyan);color:#fff;background:linear-gradient(180deg,#17507f,#0f4169);box-shadow:0 0 16px #5fd4ff33}
.shift-button:hover:not(:disabled){border-color:var(--cyan);box-shadow:0 0 16px #5fd4ff2a}
.shift-icon{font-size:19px;vertical-align:-2px;padding-right:5px}
.reset-button,.outline{background:linear-gradient(180deg,#0a1a38,#0a1731);color:#e6f0ff}
.reset-button:hover,.outline:hover{background:linear-gradient(180deg,#123162,#10264d);box-shadow:0 0 14px #4aa8ff22}
.hint{color:#d5e1f6;font-size:11px;text-align:center;margin:15px 0 0;min-height:20px}
.sidebar{display:flex;flex-direction:column;gap:18px}
.side-card{padding:25px}
.move-card{position:relative;overflow:hidden;background:radial-gradient(ellipse 180px 180px at 100% 0%,#1f5fb855 0%,transparent 100%),linear-gradient(135deg,#0d1a39,#0c1730)}
.card-icon{border-radius:10px;background:linear-gradient(180deg,#12396f,#0f2850);width:39px;height:39px;display:flex;align-items:center;justify-content:center;color:var(--cyan);font-size:22px;margin-bottom:19px;box-shadow:0 0 14px #4aa8ff33}
.side-card h2{font-size:25px;letter-spacing:-1px;line-height:1.25;margin:10px 0}
.side-card p{font-size:12px;color:#d5e1f6;line-height:1.8;margin:10px 0}
.side-card p strong{color:#f1f6ff}
.example-grid{border:1px solid #2f69cc;background:linear-gradient(180deg,#0a1730,#0e1c37);border-radius:12px;padding:13px;margin:17px 0;display:flex;gap:25px;justify-content:center;align-items:center}
.example-yellow,.example-open{width:30px;height:30px;border-radius:50%;background:radial-gradient(circle at 30% 24%,#fffad7 0%,#fff38a 16%,var(--yellow-hot) 34%,var(--yellow) 58%,#d7a100 78%,#6d4e00 100%);box-shadow:inset 0 3px 8px #fff7,inset 0 -7px 10px #0005,0 0 12px #ffe34f66}
.example-open{background:transparent;border:2px dashed #6fcfff;box-shadow:none}
.example-arrow{font-size:25px;color:var(--cyan);text-shadow:0 0 10px #5fd4ff88}
.notice{background:#0e2940;border-left:3px solid var(--cyan);color:#dff6ff;font-size:11px;line-height:1.6;padding:11px 12px;border-radius:0 8px 8px 0;box-shadow:0 0 12px #5fd4ff18}
.rules-card h3{font-size:18px;margin:10px 0 18px}
.rules-card ol{padding-left:19px;margin:0;color:#e2ecff;font-size:12px;line-height:1.7}
.rules-card li{margin:0 0 10px;padding-left:5px}
.rules-card li::marker{color:var(--cyan);font-weight:900}
.rules-card strong{color:#f1f4f9}
.small-note{padding:0 9px;font-size:10px;line-height:1.6;color:#a8bfe0;margin:0}
footer{text-align:center;color:#a8bfe0;font-size:11px;margin:35px 0 25px}
footer span{color:var(--cyan);margin:0 8px}
.online-banner{background:linear-gradient(180deg,#0c2340,#0d1c33);border:1px solid #2e69cf;border-radius:12px;padding:15px 16px;margin-bottom:20px;box-shadow:0 0 14px #4aa8ff18}
.online-head{display:flex;align-items:center;gap:9px;color:var(--cyan);font-size:12px}
.online-banner p{font-size:11px;color:#d5e1f6;margin:8px 0 12px;line-height:1.6}
.online-action-row{display:flex;gap:8px;flex-wrap:wrap}
.primary{background:linear-gradient(180deg,#33b8ff,#0f7cff);border-color:#6fd4ff;color:#fff;text-shadow:0 1px 0 #00142f;box-shadow:0 0 18px #33b8ff33}
.primary:hover{background:linear-gradient(180deg,#63ceff,#2890ff);box-shadow:0 0 20px #33b8ff55}
.small{min-height:33px;padding:7px 12px}
.online-banner .online-link{font-size:10px;overflow-wrap:anywhere;color:#bfe9ff;margin:9px 0 0}
.hidden{display:none!important}
.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,15px);padding:11px 18px;background:linear-gradient(180deg,#103058,#0d2140);color:#fff;border:1px solid #4aa8ff;border-radius:10px;font-size:12px;font-weight:750;box-shadow:0 12px 26px #0008,0 0 20px #4aa8ff33;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:99;max-width:90vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1000px){.layout{grid-template-columns:minmax(0,1fr) 270px}.game-card{padding:18px}.side-card{padding:20px}}
@media(max-width:770px){.layout{grid-template-columns:1fr;max-width:610px;margin:auto}.sidebar{display:grid;grid-template-columns:1fr 1fr}.small-note{grid-column:span 2}.topbar{height:75px}.heading{padding:29px 0}.heading h1{letter-spacing:-1.5px}}
@media(max-width:530px){.page{padding:0 12px}.heading p{font-size:12px}.game-card{padding:12px}.mode{font-size:10px;padding:7px 4px}.settings-row{flex-wrap:wrap;gap:12px;margin:17px 0}.chip{font-size:11px;padding:7px 9px}.game-state{padding:13px 7px;gap:5px}.player{gap:5px;min-width:80px}.player-disc{width:22px;height:22px}.player-name{font-size:9px}.player-sub{font-size:9px;white-space:normal}.state-center strong{font-size:14px}.status-caption{font-size:9px}.state-tag{font-size:8px}.board{border-radius:13px;gap:6px;padding:9px}.cell{border-radius:8px}.actions{gap:6px}.shift-button,.reset-button{font-size:10px;min-width:0;padding:8px 10px}.sidebar{grid-template-columns:1fr}.small-note{grid-column:auto}}

/* Player names and live presence — v0.2 */
.nickname-form{margin:17px 0 0;display:flex;justify-content:space-between;align-items:center;gap:14px;background:linear-gradient(180deg,#0c1b39,#10254d);border:1px solid #2d66cd;border-radius:12px;padding:13px 14px;box-shadow:0 0 14px #4aa8ff12}
.nickname-copy{display:flex;flex-direction:column;gap:5px}
.nickname-help{font-size:11px;color:#d6e3f8}
.nickname-controls{display:flex;align-items:center;gap:7px;flex:0 1 280px;min-width:0}
.nickname-controls input,.join-panel input{width:100%;min-width:0;background:#09142c;color:#ffffff;border:1px solid #3a79e4;border-radius:9px;font-size:13px;padding:10px 12px;font-family:inherit;outline:none;box-shadow:inset 0 1px 0 #ffffff10}
.nickname-controls input:focus,.join-panel input:focus{border-color:var(--cyan);box-shadow:0 0 0 2px #5fd4ff33,0 0 14px #5fd4ff22}
.nickname-controls .outline{white-space:nowrap}
.presence-bar{background:linear-gradient(180deg,#0d2340,#10284d);border:1px solid #316fda;border-radius:9px;padding:9px 12px;color:#edf4ff;font-size:11px;font-weight:650;display:flex;align-items:center;gap:9px;margin-top:10px}
.presence-dot{width:8px;height:8px;border-radius:50%;background:#ffd84d;box-shadow:0 0 10px #ffd84d88;flex-shrink:0}
.presence-dot.online{background:#56e6b7;box-shadow:0 0 9px #56e6b788}
.presence-dot.offline{background:#fb7474;box-shadow:none}
.join-overlay{position:fixed;inset:0;background:#020814dd;backdrop-filter:blur(3px);z-index:90;display:flex;align-items:center;justify-content:center;padding:20px}
.join-panel{width:100%;max-width:420px;background:linear-gradient(145deg,#0c1b3d,#0d1a36 55%,#11234a);border:1px solid #4aa8ff;border-radius:20px;box-shadow:0 25px 85px #0009,0 0 30px #1d4ed844;padding:30px}
.join-panel h2{font-size:27px;letter-spacing:-.8px;margin:12px 0}
.join-panel p{font-size:13px;color:#e1ebff;line-height:1.7}
.join-panel label{display:block;color:var(--cyan);font-size:11px;font-weight:850;letter-spacing:1px;margin:20px 0 8px}
.join-actions{display:flex;gap:9px;margin-top:20px;flex-wrap:wrap}
.join-panel .join-error{color:#ffb3c1;margin:12px 0 0}
@media(max-width:530px){.nickname-form{flex-direction:column;align-items:stretch;gap:10px}.nickname-controls{flex-basis:auto}.join-panel{padding:22px}.player-name{max-width:88px;overflow-wrap:anywhere}}

/* Consent-based board-size changes after an online match — v0.5 */
.rematch-panel{margin:17px 0 0;padding:17px 19px;background:linear-gradient(130deg,#0f2547,#112a53);border:1px solid #4aa8ff;border-radius:12px;box-shadow:0 0 18px #4aa8ff12}
.rematch-heading{display:flex;align-items:center;gap:9px;color:#ffffff;font-size:14px}
.rematch-spark{color:var(--cyan);font-size:20px}
.rematch-panel p{color:#dce8ff;line-height:1.6;font-size:12px;margin:10px 0 0}
.rematch-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip.proposed{border-color:#5fd4ff;box-shadow:0 0 0 1px #5fd4ff,0 0 14px #5fd4ff22;background:linear-gradient(180deg,#184780,#10315e);color:#ffffff}
.chip:disabled{opacity:.58;cursor:not-allowed}
@media(max-width:530px){.rematch-panel{padding:14px}.rematch-actions{gap:7px}}

/* Player onboarding — v0.4 */
.welcome-panel{border-color:#4aa8ff;max-width:460px;background:linear-gradient(155deg,#0f2148,#0c1732 70%,#132a56);box-shadow:0 25px 85px #0009,0 0 30px #1d4ed844}
.welcome-panel h2{font-size:30px;line-height:1.15;max-width:350px}
.welcome-pieces{display:flex;gap:10px;margin-bottom:24px}
.welcome-pieces span{display:block;width:27px;height:27px;border-radius:50%;background:radial-gradient(circle at 30% 24%,#fffad7 0%,#fff38a 16%,var(--yellow-hot) 34%,var(--yellow) 58%,#d7a100 78%,#6d4e00 100%);border:1px solid #fff1aa;box-shadow:0 0 14px #ffe34f66,0 4px 13px #0007}
.welcome-pieces span:last-child{background:radial-gradient(circle at 30% 24%,#ffe0e5 0%,#ff9cab 16%,var(--red-hot) 34%,var(--red) 58%,#b51647 78%,#540b24 100%);border-color:#ffb3c1;box-shadow:0 0 14px #ff617d66,0 4px 13px #0007}
.welcome-panel .welcome-start{width:100%;font-size:13px}
.welcome-panel .welcome-note{font-size:11px;margin:15px 0 0;text-align:center;color:#c7d9f6}
@media(max-width:530px){.welcome-panel h2{font-size:26px}}


/* Neon theme adjustments — v0.6 */
.primary,.shift-button,.reset-button,.outline,.mode,.chip{transition:background .18s,border-color .18s,transform .18s,box-shadow .18s,color .18s}
.actions button:hover:not(:disabled), .online-action-row button:hover:not(:disabled), .nickname-controls button:hover:not(:disabled), .join-actions button:hover:not(:disabled), .rematch-actions button:hover:not(:disabled){transform:translateY(-1px)}
.side-card h2,.join-panel h2,.welcome-panel h2{color:#fff;text-shadow:0 0 10px #4aa8ff22}
.heading h1{color:#fff;text-shadow:0 0 14px #4aa8ff14}