:root{color-scheme:dark;--navy:#071d28;--panel:#102c39;--gold:#e5bd79;--ink:#ecf2f3;--muted:#a7bfc9;--cell:38px;font-family:Arial,Helvetica,sans-serif;background:var(--navy);color:var(--ink)}
*{box-sizing:border-box}body{margin:0;min-width:280px}button,select{font:inherit}button,a,select,summary{-webkit-tap-highlight-color:transparent}button,select{min-height:44px}button{cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible,.board-scroll:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button:disabled{cursor:default}.game-shell{width:min(900px,calc(100% - 40px));margin:0 auto;padding:26px 0 22px}.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:.875rem}.topbar a{text-decoration:none;color:var(--muted);padding:10px 0}.topbar a:hover{color:var(--gold)}.arcade-label{font-size:.75rem;letter-spacing:.15em;color:var(--gold);white-space:nowrap}.heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:20px 0 22px}.heading h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(2.5rem,6vw,3.65rem);line-height:1.08;font-weight:400;letter-spacing:-.045em;margin:0}.title-dot{color:var(--gold)}.heading p{margin:0;font-size:1rem;color:var(--muted)}.game-panel{border:1px solid #36505b;border-top:3px solid var(--gold);border-radius:5px;background:var(--panel);overflow:hidden;box-shadow:0 20px 60px #0003}.toolbar{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;padding:20px 24px;border-bottom:1px solid #36505b}.level-control{display:flex;flex-direction:column;gap:7px;min-width:0}.level-control label{font-size:.875rem;color:var(--muted)}select{max-width:100%;background:#071d28;color:var(--ink);border:1px solid #526b77;border-radius:4px;padding:9px 32px 9px 12px;font-size:1rem}.new-game{background:var(--gold);color:#16222b;border:1px solid var(--gold);border-radius:4px;padding:10px 16px;font-weight:700;white-space:nowrap}.new-game:hover{background:#f7d59c}.new-game span{font-size:1.15rem;padding-right:5px}.scoreboard{display:grid;grid-template-columns:1fr 1fr 1fr;align-items:center;gap:12px;padding:20px 24px 15px}.counter{display:flex;flex-direction:column;gap:5px}.stat-label{color:var(--muted);font-size:.75rem;letter-spacing:.12em}.counter strong{font-family:'Courier New',monospace;font-size:2rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--gold);line-height:1.15}.time{text-align:right}.board-meta{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;color:var(--muted);font-size:.875rem}.board-meta span:first-child{color:var(--ink);font-weight:600}.status{padding:3px 18px 17px;text-align:center;color:#d5e2e7;font-size:1rem;line-height:1.45;min-height:43px}.status.won{color:#b3f0bf}.status.lost{color:#ffb8ae}.board-well{margin:0 24px;background:#071a24;border:1px solid #38515c;border-radius:4px;padding:16px}.board-scroll{overflow:auto;max-width:100%;overscroll-behavior-x:contain;scrollbar-color:#819aa5 #071a24;scrollbar-width:thin;padding:4px 4px 10px}.board{display:grid;grid-template-columns:repeat(var(--cols,9),var(--cell));width:max-content;margin:0 auto;border:2px solid #020e15;background:#8197a1;gap:1px;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:pan-x pan-y}.board-row{display:contents}.cell{display:flex;align-items:center;justify-content:center;width:var(--cell);height:var(--cell);min-height:0;padding:0;border:0;border-top:2px solid #f0f5f6;border-left:2px solid #f0f5f6;border-right:2px solid #9dabb0;border-bottom:2px solid #9dabb0;border-radius:0;background:#cedbe0;color:#102d3b;font-family:'Courier New',monospace;font-size:1.2rem;font-weight:700;line-height:1;position:relative;touch-action:pan-x pan-y}.cell:hover:not(.open):not(.mine):not(.wrong){background:#e2eaec}.cell:focus-visible{outline:3px solid #f8bb46;outline-offset:-3px;z-index:1}.cell.open{border:0;background:#aebfc7;color:#243d49}.cell.open[data-number="1"]{color:#144f9d}.cell.open[data-number="2"]{color:#185d39}.cell.open[data-number="3"]{color:#a32926}.cell.open[data-number="4"]{color:#523382}.cell.open[data-number="5"]{color:#782827}.cell.open[data-number="6"]{color:#125c67}.cell.open[data-number="7"]{color:#16202a}.cell.open[data-number="8"]{color:#41474b}.cell.flagged{color:#a13d1a;font-family:Arial,sans-serif;font-size:1.45rem}.cell.mine{border:0;background:#bcc9ce;color:#28343b;font-size:1.6rem}.cell.detonated{background:#ba443b;color:#fff}.cell.wrong{background:#f2c3b5;color:#942e1f;font-size:1.5rem}.board.finished .cell{cursor:default}.control-deck{padding:20px 16px 17px;text-align:center}.mode-buttons{display:inline-flex;border:1px solid #667f8b;border-radius:5px;overflow:hidden;max-width:100%}.mode-buttons button{color:#d5e2e7;background:transparent;border:0;padding:10px 25px;min-width:110px}.mode-buttons button+button{border-left:1px solid #667f8b}.mode-buttons button[aria-pressed="true"]{background:var(--gold);color:#16222b;font-weight:700}.mode-buttons button:focus-visible{outline-offset:-4px}.mode-buttons span{margin-right:6px}.control-deck p{margin:12px 0 0;font-size:.875rem;line-height:1.5;color:var(--muted)}.control-deck .scroll-hint{color:var(--gold)}.instructions{margin:18px 0 0;border-bottom:1px solid #304853}.instructions summary{list-style:none;display:flex;justify-content:space-between;align-items:center;font-size:1rem;cursor:pointer;padding:14px 0 18px}.instructions summary::-webkit-details-marker{display:none}.instructions summary span{font-size:1.3rem;color:var(--gold)}.instructions[open] summary span{transform:rotate(45deg)}.rules{color:#b8cbd3;line-height:1.65;font-size:1rem;max-width:760px;padding-bottom:12px}.rules p{margin:0 0 14px}.rules strong{color:#edf3f5}footer{text-align:center;font-size:.875rem;color:var(--muted);line-height:1.6;margin:20px 0 0}footer a{color:var(--gold);text-underline-offset:3px}noscript{display:block;color:#ffc5b8;padding:20px;text-align:center}
@media(min-width:700px){.game-shell:has(.board[data-level="beginner"]){width:min(660px,calc(100% - 40px))}.board[data-level="beginner"]{--cell:42px}}
@media(max-width:560px){.game-shell{width:calc(100% - 24px);padding-top:10px}.heading{margin:14px 0 17px;gap:8px}.heading p{font-size:.875rem}.toolbar{padding:14px 12px;gap:8px}.new-game{padding:10px;font-size:.875rem}select{font-size:.875rem;padding-left:8px;padding-right:18px}.scoreboard{padding:17px 14px 13px}.counter strong{font-size:1.8rem}.board-meta{font-size:.75rem}.status{font-size:.875rem;padding-left:12px;padding-right:12px}.board-well{margin:0 10px;padding:6px}.board[data-level="beginner"]{--cell:clamp(24px,calc((100vw - 80px)/9 - 1px),38px)}.cell{font-size:1.125rem}.control-deck{padding:16px 10px}.topbar{gap:8px}.arcade-label{font-size:.75rem;letter-spacing:.07em}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}