@import "https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap";body{overscroll-behavior:contain}*,:before,:after{box-sizing:border-box}html,body{margin:0;padding:0}button{font:inherit;color:inherit;cursor:pointer;background:0 0;border:0}input{font:inherit;color:inherit;background:0 0;border:0}h1,h2,h3,h4,p{margin:0}:root{--font-display:"Chakra Petch", "Space Grotesk", ui-sans-serif, system-ui, sans-serif;--font-body:"Space Grotesk", "Inter", ui-sans-serif, system-ui, sans-serif;--font-mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;--r-xs:4px;--r-sm:6px;--r-md:10px;--r-lg:14px;--r-xl:20px;--gutter:16px;--maxw:1160px;--cell-size:clamp(26px, 4vw, 38px)}:root,:root[data-theme=dark]{--ink-1000:oklch(10% .015 230);--ink-950:oklch(13% .02 230);--ink-900:oklch(16% .024 224);--ink-850:oklch(19% .026 222);--ink-800:oklch(22% .03 221);--ink-700:oklch(28% .033 220);--ink-600:oklch(35% .035 220);--ink-500:oklch(50% .033 220);--ink-400:oklch(62% .028 220);--ink-300:oklch(75% .024 220);--ink-200:oklch(86% .015 220);--ink-100:oklch(96% .008 220);--cyan:oklch(78% .12 205);--cyan-bright:oklch(85% .14 200);--cyan-dim:oklch(55% .08 205);--amber:oklch(82% .13 78);--amber-dim:oklch(60% .12 72);--hit:oklch(66% .2 25);--hit-bright:oklch(75% .19 28);--miss:oklch(55% .03 222);--mint:oklch(74% .14 162);--mint-dim:oklch(55% .1 165);--bg:var(--ink-950);--panel:color-mix(in oklab, var(--ink-900) 96%, transparent);--panel-2:var(--ink-850);--border:color-mix(in oklab, var(--ink-600) 70%, transparent);--border-2:color-mix(in oklab, var(--cyan) 22%, transparent);--text:var(--ink-100);--text-dim:var(--ink-300);--text-mute:var(--ink-400);--shadow-1:0 1px 0 oklab(100% 0 5.96046e-8/.04) inset, 0 18px 40px -20px #000000b3;--shadow-2:0 1px 0 oklab(100% 0 5.96046e-8/.06) inset, 0 30px 70px -30px #000000e6;--input-bg:color-mix(in oklab, var(--ink-1000) 60%, transparent);--input-border:var(--border);--input-focus:color-mix(in oklab, var(--cyan) 60%, transparent);--chip-bg:color-mix(in oklab, var(--ink-1000) 50%, transparent);--chip-border:var(--border);--tray-bg:color-mix(in oklab, var(--ink-1000) 55%, transparent);--tray-border:var(--border);--tray-active-bg:color-mix(in oklab, var(--cyan) 8%, transparent);--tray-active-bd:color-mix(in oklab, var(--cyan) 45%, transparent);--tray-placed-bg:color-mix(in oklab, var(--mint) 6%, transparent);--tray-placed-bd:color-mix(in oklab, var(--mint) 30%, var(--border));--board-shell:color-mix(in oklab, var(--ink-1000) 70%, transparent);--board-border:color-mix(in oklab, var(--cyan) 18%, var(--border));--grid-line:color-mix(in oklab, var(--cyan) 16%, var(--ink-700));--grid-cell-bg:color-mix(in oklab, var(--ink-1000) 80%, transparent);--grid-cell-hover:color-mix(in oklab, var(--cyan) 10%, var(--ink-900));--grid-hit:color-mix(in oklab, var(--hit) 30%, transparent);--grid-miss:color-mix(in oklab, var(--miss) 30%, transparent);--ship-cell-bg:color-mix(in oklab, var(--cyan) 18%, transparent);--preview-valid:color-mix(in oklab, var(--cyan) 28%, transparent);--preview-invalid:color-mix(in oklab, var(--hit) 28%, transparent);--coord-color:var(--cyan);--msg-info-bg:color-mix(in oklab, var(--cyan) 8%, var(--ink-1000));--msg-info-bd:color-mix(in oklab, var(--cyan) 30%, var(--border));--msg-info-tx:var(--cyan-bright);--msg-error-bg:color-mix(in oklab, var(--hit) 10%, var(--ink-1000));--msg-error-bd:color-mix(in oklab, var(--hit) 40%, var(--border));--msg-error-tx:oklch(82% .12 25)}:root[data-theme=light]{--ink-1000:oklch(98% .005 220);--ink-950:oklch(96% .008 220);--ink-900:oklch(94% .01 220);--ink-850:oklch(92% .012 220);--ink-800:oklch(90% .014 220);--ink-700:oklch(82% .02 220);--ink-600:oklch(72% .025 220);--ink-500:oklch(58% .03 220);--ink-400:oklch(45% .035 220);--ink-300:oklch(32% .03 220);--ink-200:oklch(22% .025 220);--ink-100:oklch(14% .02 220);--cyan:oklch(52% .14 220);--cyan-bright:oklch(45% .16 222);--cyan-dim:oklch(65% .1 220);--bg:var(--ink-1000);--panel:oklab(100% 0 5.96046e-8/.9);--panel-2:var(--ink-950);--border:var(--ink-700);--border-2:color-mix(in oklab, var(--cyan) 35%, transparent);--text:var(--ink-100);--text-dim:var(--ink-400);--text-mute:var(--ink-500);--shadow-1:0 1px 0 #ffffffb3 inset, 0 12px 28px -16px #0d21342e;--shadow-2:0 1px 0 #fffc inset, 0 20px 44px -24px #0d213447;--input-bg:oklab(100% 0 5.96046e-8/.95);--chip-bg:color-mix(in oklab, var(--cyan) 6%, white);--tray-bg:oklab(100% 0 5.96046e-8/.92);--tray-active-bg:color-mix(in oklab, var(--cyan) 10%, white);--tray-placed-bg:color-mix(in oklab, var(--mint) 8%, white);--board-shell:oklab(100% 0 5.96046e-8/.96);--grid-line:color-mix(in oklab, var(--cyan) 25%, var(--ink-700));--grid-cell-bg:oklab(100% 0 5.96046e-8/.97);--grid-cell-hover:color-mix(in oklab, var(--cyan) 8%, white);--grid-hit:color-mix(in oklab, var(--hit) 25%, white);--grid-miss:color-mix(in oklab, var(--miss) 18%, white);--ship-cell-bg:color-mix(in oklab, var(--cyan) 22%, white);--msg-info-bg:color-mix(in oklab, var(--cyan) 8%, white);--msg-error-bg:color-mix(in oklab, var(--hit) 8%, white);--msg-error-tx:oklch(40% .14 25)}html,body{background:var(--bg);color:var(--text);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}:root[data-theme=light] body{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}body{font-family:var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;overscroll-behavior:contain;background:radial-gradient(80% 60% at 20% 0%, color-mix(in oklab, var(--cyan) 12%, transparent) 0%, transparent 60%), radial-gradient(60% 50% at 100% 10%, color-mix(in oklab, var(--amber) 8%, transparent) 0%, transparent 55%), linear-gradient(180deg, var(--ink-950), var(--ink-1000) 60%);min-height:100vh;font-size:15px;line-height:1.5;transition:background-color .22s}button{touch-action:manipulation}button:focus-visible,input:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}#root{z-index:1;min-height:100vh;position:relative}.app-shell{max-width:var(--maxw);padding:24px var(--gutter) 36px;padding-top:max(env(safe-area-inset-top), 22px);padding-bottom:max(env(safe-area-inset-bottom), 18px);z-index:1;flex-direction:column;gap:16px;min-height:100dvh;margin:0 auto;display:flex;position:relative}.app-header{border:1px solid var(--border);border-radius:var(--r-lg);background:linear-gradient(180deg, color-mix(in oklab, var(--ink-800) 92%, transparent), color-mix(in oklab, var(--ink-900) 92%, transparent));box-shadow:var(--shadow-1);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:14px 20px;animation:.65s cubic-bezier(.22,.61,.36,1) backwards panel-rise;display:flex;position:relative;overflow:hidden}.app-header:before{content:"";background:linear-gradient(90deg, transparent 30%, color-mix(in oklab, var(--cyan) 8%, transparent) 50%, transparent 70%);pointer-events:none;position:absolute;inset:0;-webkit-mask:linear-gradient(#000,#0000 60%);mask:linear-gradient(#000,#0000 60%)}.header-row{flex:1;justify-content:flex-start;align-items:center;gap:12px;min-width:0;display:flex}.app-title{font-family:var(--font-display);letter-spacing:.14em;text-transform:uppercase;color:var(--text);align-items:center;gap:12px;margin:0;font-size:clamp(1.2rem,2.4vw,1.6rem);font-weight:700;display:inline-flex}.app-title:before{content:"◣";background:color-mix(in oklab, var(--cyan) 14%, var(--ink-1000));width:34px;height:34px;color:var(--cyan-bright);border:1px solid color-mix(in oklab, var(--cyan) 40%, transparent);box-shadow:inset 0 0 12px color-mix(in oklab, var(--cyan) 18%, 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.12s,background .18s,border-color .18s,box-shadow .18s,filter .18s;display:inline-flex}.primary-btn:hover,.ghost-btn:hover{filter:brightness(1.05);transform:translateY(-1px)}.primary-btn:active,.ghost-btn:active{transform:translateY(0)}.primary-btn:disabled,.ghost-btn:disabled{opacity:.55;cursor:not-allowed;filter:none;transform:none}.primary-btn{color:var(--ink-1000);background:linear-gradient(180deg, var(--cyan-bright), var(--cyan));border-color:color-mix(in oklab, var(--cyan) 55%, transparent);box-shadow:0 0 0 1px color-mix(in oklab, var(--cyan) 30%, transparent), 0 10px 26px -10px color-mix(in oklab, var(--cyan) 40%, transparent), inset 0 1px 0 #ffffff40}.primary-btn:hover{box-shadow:0 0 0 1px color-mix(in oklab, var(--cyan) 60%, transparent), 0 14px 32px -10px color-mix(in oklab, var(--cyan) 50%, transparent), inset 0 1px 0 #ffffff4d}.btn-secondary,.primary-btn.btn-secondary{color:var(--ink-1000);background:linear-gradient(180deg, var(--amber), 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0}.lobby-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:16px;display:flex}.lobby-help-actions{flex-wrap:wrap;gap:8px;display:flex}.lobby-divider{color:var(--text-mute);font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;align-items:center;gap:12px;margin:22px 0 18px;font-size:.72rem;display:flex}.lobby-divider:before,.lobby-divider:after{content:"";background:linear-gradient(90deg, transparent, var(--border), transparent);flex:1;height:1px}.vs-computer-section{flex-direction:column;align-items:center;gap:12px;display:flex}.vs-computer-section .helper-text{text-align:center;margin:0}.difficulty-buttons{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.open-rooms{width:100%;margin-top:18px}.open-rooms-title{font-family:var(--font-mono);letter-spacing:.18em;text-transform:uppercase;color:var(--text-mute);margin:0 0 8px;font-size:.7rem;font-weight:500}.room-list{flex-direction:column;gap:6px;margin:0;padding:0;list-style:none;display:flex}.room-row{border-radius:var(--r-md);background:var(--tray-bg);border:1px solid var(--tray-border);justify-content:space-between;align-items:center;padding:10px 14px;transition:background .18s,border-color .18s;display:flex}.room-row:hover{border-color:color-mix(in oklab, var(--cyan) 40%, var(--border));background:color-mix(in oklab, var(--cyan) 6%, var(--tray-bg))}.room-row-id{font-family:var(--font-mono);letter-spacing:.08em;color:var(--cyan);white-space:nowrap;font-size:.9rem;font-weight:600}.room-join-btn{padding:6px 14px;font-size:.82rem}.room-status-pill{font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;border:1px solid;border-radius:999px;padding:3px 8px;font-size:.72rem;font-weight:600}.room-status-pill.warn{color:oklch(78% .18 80);background:oklch(78% .18 80/.08);border-color:oklch(78% .18 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var(--tray-border);border-radius:var(--r-md);background:var(--tray-bg);cursor:grab;-webkit-user-select:none;user-select:none;flex-direction:column;align-items:center;gap:8px;min-width:90px;padding:12px 10px;transition:border-color .18s,transform .18s,background-color .18s,box-shadow .18s,opacity .18s;display:flex;position:relative}.ship-tray-item:before{content:"";border-top:1px solid color-mix(in oklab, var(--cyan) 35%, transparent);border-right:1px solid color-mix(in oklab, var(--cyan) 35%, transparent);opacity:.5;width:10px;height:10px;position:absolute;top:6px;right:6px}.ship-tray-item:hover{border-color:color-mix(in oklab, var(--cyan) 45%, transparent);background:color-mix(in oklab, var(--cyan) 6%, var(--tray-bg));transform:translateY(-2px)}.ship-tray-item.tray-active{border-color:color-mix(in oklab, var(--cyan) 65%, transparent);background:var(--tray-active-bg);box-shadow:0 0 0 1px color-mix(in oklab, var(--cyan) 45%, transparent), 0 8px 24px -8px color-mix(in oklab, var(--cyan) 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.tray-count{color:var(--mint)}.setup-controls{flex-wrap:wrap;grid-area:controls;align-items:center;gap:10px;display:flex}.btn-fixed-width{text-align:center;min-width:130px}.counter-text{font-family:var(--font-mono);letter-spacing:.04em;color:var(--text-dim);margin:0;font-size:.82rem;font-weight:500}.board-wrapper{background:radial-gradient(60% 60% at 50% 30%, color-mix(in oklab, var(--cyan) 7%, transparent), transparent 70%), linear-gradient(180deg, color-mix(in oklab, var(--ink-1000) 78%, transparent), color-mix(in oklab, var(--ink-900) 86%, transparent));border:1px solid var(--board-border);border-radius:var(--r-md);box-shadow:var(--shadow-1), inset 0 0 0 1px color-mix(in oklab, var(--cyan) 6%, transparent);display:inline-block;position:relative;overflow:visible}.board-wrapper:before,.board-wrapper:after{content:"";pointer-events:none;z-index:3;width:14px;height:14px;position:absolute}.board-wrapper:before{border-top:1px solid var(--cyan);border-left:1px solid var(--cyan);top:-6px;left:-6px}.board-wrapper:after{border-bottom:1px solid var(--cyan);border-right:1px solid var(--cyan);bottom:-6px;right:-6px}.board-grid{grid-template-columns:repeat(11, var(--cell-size));grid-template-rows:repeat(11, var(--cell-size));contain:paint;gap:0;display:grid;position:relative}.board-corner{background:0 0;border:none}.axis-label{color:var(--coord-color);font-family:var(--font-mono);letter-spacing:.04em;-webkit-user-select:none;user-select:none;background:0 0;justify-content:center;align-items:center;font-size:.72rem;font-weight:600;display:flex}.grid-cell{width:var(--cell-size);height:var(--cell-size);border:none;border-right:1px solid var(--grid-line);border-bottom:1px solid var(--grid-line);background:var(--grid-cell-bg);appearance:none;padding:0;transition:background-color 80ms,border-color 80ms;position:relative}.grid-cell.cell-top-edge{border-top:1px solid var(--grid-line)}.grid-cell.cell-left-edge{border-left:1px solid var(--grid-line)}.grid-cell.cell-clickable{cursor:pointer}.grid-cell.cell-clickable:hover{background:var(--grid-cell-hover);border-color:var(--amber)}.grid-cell.cell-disabled,.grid-cell:disabled{cursor:default;pointer-events:none}.grid-cell.ship-cell{background:linear-gradient(180deg, color-mix(in oklab, var(--cyan) 18%, transparent), color-mix(in oklab, var(--cyan) 8%, transparent)), var(--grid-cell-bg);border-color:color-mix(in oklab, var(--cyan) 28%, var(--grid-line))}.grid-cell.cell-preview{background:repeating-linear-gradient(45deg, var(--preview-valid) 0 4px, transparent 4px 8px), var(--grid-cell-bg);border-color:color-mix(in oklab, var(--cyan) 50%, transparent)}.grid-cell.cell-preview-invalid{background:repeating-linear-gradient(45deg, var(--preview-invalid) 0 4px, transparent 4px 8px), var(--grid-cell-bg);border-color:color-mix(in oklab, var(--hit) 50%, transparent)}.grid-cell.miss{background:var(--grid-cell-bg);border-color:color-mix(in oklab, var(--miss) 35%, var(--grid-line));pointer-events:none}.grid-cell.miss:after{content:"";background:color-mix(in oklab, var(--miss) 75%, white);border-radius:50%;position:absolute;inset:35%}.grid-cell.hit,.grid-cell.hit:disabled{pointer-events:none}.grid-cell.hit{background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><g stroke='white' stroke-width='3.5' stroke-linecap='round' fill='none'><line x1='6' y1='6' x2='18' y2='18'/><line x1='18' y1='6' x2='6' y2='18'/></g></svg>") center / 55% 55% no-repeat, radial-gradient(circle at 50% 50%, color-mix(in oklab, var(--hit-bright) 55%, transparent) 0%, color-mix(in oklab, var(--hit) 28%, transparent) 50%, transparent 75%), var(--grid-cell-bg);border-color:color-mix(in oklab, var(--hit) 55%, var(--grid-line));z-index:3}:root[data-theme=light] .grid-cell.hit{background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><g stroke='%237f1e2b' stroke-width='3.5' stroke-linecap='round' fill='none'><line x1='6' y1='6' x2='18' y2='18'/><line x1='18' y1='6' x2='6' y2='18'/></g></svg>") center / 55% 55% no-repeat, radial-gradient(circle at 50% 50%, color-mix(in oklab, var(--hit-bright) 35%, transparent) 0%, color-mix(in oklab, var(--hit) 18%, transparent) 50%, transparent 75%), var(--grid-cell-bg)}.grid-cell.pending{outline:2px dashed var(--amber);outline-offset:-3px;animation:1.4s ease-in-out infinite pulse-amber}@keyframes pulse-amber{0%,to{box-shadow:0 0 0 0 color-mix(in oklab, var(--amber) 30%, transparent)}50%{box-shadow:0 0 0 4px color-mix(in oklab, var(--amber) 0%, transparent)}}.battle-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:16px;display:flex}.turn-indicator{border:1px solid color-mix(in oklab, var(--amber) 30%, var(--border));background:radial-gradient(50% 80% at 50% 0%, color-mix(in oklab, var(--amber) 14%, transparent), transparent), color-mix(in oklab, var(--ink-1000) 55%, transparent);font-family:var(--font-display);letter-spacing:.12em;text-transform:uppercase;color:var(--amber);text-shadow:0 0 16px color-mix(in oklab, var(--amber) 40%, transparent);border-radius:999px;margin:0;padding:8px 16px;font-size:.82rem;font-weight:600}.dual-boards{flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:20px;display:flex;position:relative}.win-overlay{border-radius:var(--r-lg);pointer-events:none;z-index:20;background:0 0;justify-content:center;align-items:center;animation:1.6s .3s forwards win-bg-fade;display:flex;position:absolute;inset:0}.win-overlay-text{font-family:var(--font-display);letter-spacing:.08em;color:gold;text-shadow:0 0 20px #ffd700e6,0 0 50px #ffd70080,0 4px 24px #000000e6;opacity:0;font-size:clamp(1.8rem,7vw,3.5rem);font-weight:900;animation:1s 1.2s forwards win-text-rise}@keyframes win-bg-fade{0%{background:0 0}to{background:#000000b8}}@keyframes win-text-rise{0%{opacity:0;transform:scale(.4)translateY(10px)}65%{opacity:1;transform:scale(1.08)translateY(-4px)}to{opacity:1;transform:scale(1)translateY(0)}}.board-card{border:1px solid var(--border);border-radius:var(--r-lg);background:var(--ink-900);box-shadow:var(--shadow-1);contain:paint;flex-direction:column;gap:12px;padding:14px;animation:.55s cubic-bezier(.22,.61,.36,1) backwards panel-rise;display:flex}.board-card:nth-child(2){animation-delay:.1s}.board-title{font-family:var(--font-display);letter-spacing:.12em;text-transform:uppercase;color:var(--text);align-items:center;gap:8px;margin:0;font-size:.92rem;font-weight:600;display:inline-flex}.board-title:before{content:"▸";color:var(--cyan);font-size:.82em}.result-layout{flex-direction:column;gap:16px;display:flex}.result-panel{background:linear-gradient(180deg, color-mix(in oklab, var(--cyan) 8%, var(--ink-900)), color-mix(in oklab, var(--cyan) 4%, var(--ink-900)));border-color:var(--border-2);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.result-panel .panel-title{color:var(--cyan-bright);text-shadow:0 0 18px color-mix(in oklab, var(--cyan) 40%, transparent)}@keyframes panel-rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes modal-rise{0%{opacity:0;transform:translateY(12px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}}@media (width<=980px){.setup-layout{grid-template-columns:1fr;grid-template-areas:"tray""controls""board""error""submit"}.setup-layout>.primary-btn:last-child{justify-self:stretch}.setup-layout>.board-wrapper{justify-self:center}}@media (width<=760px){:root{--cell-size:clamp(27px, 7.5vw, 34px);--gutter:14px}.app-header{padding:12px 14px}.app-title{letter-spacing:.12em;font-size:1.1rem}.app-title:before{width:30px;height:30px;font-size:12px}.session-meta{justify-content:flex-start;width:100%;margin-left:0}.battle-header{flex-direction:column;align-items:flex-start}.dual-boards{gap:14px}}@media (width<=600px){.lobby-header{flex-direction:column;align-items:flex-start}.header-row{flex-wrap:nowrap}.panel{padding:16px}.modal-box{padding:20px}}@media (width<=480px){:root{--cell-size:clamp(24px, 8vw, 30px)}.ship-tray{grid-template-columns:repeat(2,1fr)}.tray-name{font-size:.76rem}.difficulty-buttons .primary-btn{flex:1}}