#root{min-height:100vh}.app-shell{width:min(1240px,100%);min-height:100vh;margin:0 auto;padding:0 42px 24px}.site-header{display:flex;min-height:82px;align-items:center;justify-content:space-between;border-bottom:1px solid var(--color-border)}.brand{display:inline-flex;align-items:center;gap:10px;color:#f1f6fb;font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:-.055em;text-decoration:none}.brand-mark{display:grid;width:30px;height:30px;place-items:center;border:1px solid rgb(109 224 192 / 28%);border-radius:10px;background:#6de0c01c;color:var(--color-teal);font-size:18px}.header-note{display:inline-flex;align-items:center;gap:9px;color:#9eacbb;font-size:12px;letter-spacing:.015em}.online-dot{width:7px;height:7px;border-radius:50%;background:var(--color-teal);box-shadow:0 0 11px #6de0c0b3}.game-layout{display:grid;grid-template-columns:minmax(230px,.73fr) minmax(0,1.8fr);gap:24px;align-items:start;padding-top:30px}.control-panel,.board-panel{min-width:0;border:1px solid var(--color-border);border-radius:19px;background:linear-gradient(150deg,#1f2c3bf7,#17212ef7);box-shadow:0 22px 70px #0003,inset 0 1px #ffffff05}.control-panel{padding:26px 23px 22px}.intro{margin-bottom:25px}.eyebrow{margin:0 0 9px;color:#80d9c2;font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase}.intro h1,.board-heading h2{margin:0;color:#edf4fa;font-family:var(--font-display);letter-spacing:-.055em}.intro h1{font-size:clamp(27px,3vw,34px);font-weight:800;line-height:1.14}.intro-copy{margin:11px 0 0;color:#99a7b7;font-size:13px;line-height:1.65}.field-label{display:block;margin-bottom:8px;color:#b8c4d0;font-size:11px;font-weight:600;letter-spacing:.04em}.difficulty-select{width:100%;min-height:45px;padding:0 38px 0 13px;border:1px solid rgb(176 200 222 / 14%);border-radius:10px;appearance:none;background:linear-gradient(45deg,transparent 50%,#91a1b3 50%) calc(100% - 17px) 19px / 5px 5px no-repeat,linear-gradient(135deg,#91a1b3 50%,transparent 50%) calc(100% - 13px) 19px / 5px 5px no-repeat,#17212d;color:#e5edf5;font-size:13px;cursor:pointer}.difficulty-select option{color:#17212d}.control-actions{display:grid;grid-template-columns:1.25fr .75fr;gap:9px;margin-top:11px}.button{display:inline-flex;min-height:44px;align-items:center;justify-content:center;gap:7px;padding:0 12px;border:1px solid transparent;border-radius:10px;font-size:12px;font-weight:700;cursor:pointer;transition:transform .15s ease,background-color .15s ease,border-color .15s ease}.button:hover{transform:translateY(-1px)}.button:active{transform:translateY(0)}.button-primary{background:linear-gradient(135deg,#7ce2c6,#58cbaa);box-shadow:0 6px 20px #49c7a42e;color:#10231f}.button-primary:hover{background:linear-gradient(135deg,#92edd4,#6bdcbc)}.button-primary span{font-size:16px}.button-secondary{border-color:#b6cbdf21;background:#202b39;color:#d7e0ea}.button-secondary:hover{border-color:#b6cbdf45;background:#273546}.flag-mode-button{display:flex;width:min(310px,100%);min-height:64px;align-items:center;gap:12px;margin:0 0 12px;padding:10px 12px;border:1px solid rgb(182 203 223 / 12%);border-radius:12px;background:#1a2532;text-align:left;cursor:pointer;transition:border-color .15s ease,background-color .15s ease}.flag-mode-button:hover,.flag-mode-button.is-active{border-color:#f4b96273;background:#684d2e2b}.flag-mode-icon{display:grid;width:34px;height:34px;flex:0 0 auto;place-items:center;border-radius:10px;background:#f6bb661f;color:#f0bd70;font-size:19px}.flag-mode-text{display:grid;flex:1;gap:3px}.flag-mode-text strong{color:#e1e9f1;font-size:12px}.flag-mode-text>span{color:#8999aa;font-size:10px}.mode-switch{position:relative;width:30px;height:17px;flex:0 0 auto;border-radius:12px;background:#344354;transition:background-color .15s ease}.mode-switch:after{position:absolute;top:3px;left:3px;width:11px;height:11px;border-radius:50%;background:#c1ccd6;content:"";transition:transform .15s ease,background-color .15s ease}.is-active .mode-switch{background:#ad7d44}.is-active .mode-switch:after{transform:translate(13px);background:#fff4de}.how-to-play{margin-top:25px;padding-top:21px;border-top:1px solid var(--color-border)}.how-to-play h2{margin:0 0 13px;color:#cbd5df;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.how-to-play ul{display:grid;gap:12px;margin:0;padding:0;color:#a1afbd;font-size:11px;list-style:none}.how-to-play li{display:flex;align-items:center;gap:10px}.instruction-icon{display:grid;width:22px;height:22px;flex:0 0 auto;place-items:center;border:1px solid rgb(182 203 223 / 10%);border-radius:6px;background:#202d3b;color:#aab9c8;font-size:11px}.number-icon{color:#79a9ff;font-family:var(--font-mono);font-weight:700}.flag-icon{color:#efbd73}.first-click-note{display:flex;align-items:center;gap:8px;margin:22px 0 0;padding:11px 12px;border:1px solid rgb(109 224 192 / 15%);border-radius:9px;background:#4a988114;color:#a7daca;font-size:10px}.first-click-note span{color:#75d9bc}.board-panel{--cell-size: 34px;min-width:0;padding:25px 26px 19px}.board-heading{display:flex;min-height:44px;align-items:center;justify-content:space-between;gap:15px;margin-bottom:17px}.board-heading .eyebrow{margin-bottom:5px}.board-heading h2{font-size:21px;font-weight:750}.difficulty-pill{display:inline-flex;min-height:26px;align-items:center;padding:0 9px;border:1px solid rgb(127 157 185 / 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9%);border-radius:13px;background:linear-gradient(110deg,#17212de5,#1d2a38c2),#182331}.score-card{display:flex;min-width:112px;align-items:center;gap:10px}.score-icon{display:grid;width:38px;height:38px;place-items:center;border-radius:11px;font-size:18px}.mine-icon{background:#ee96851c;color:#ef9d8f}.timer-icon{background:#6eaee51c;color:#89b8e4;font-size:23px}.score-card>div{display:grid;gap:2px}.score-label{color:#8898a9;font-size:10px}.score-value{color:#f1f5f9;font-family:var(--font-mono);font-size:19px;font-weight:500;letter-spacing:-.05em}.score-value.is-negative{color:#f0998d}.score-divider{width:1px;height:34px;background:#b8cadc1f}.status-face{margin-left:auto;font-size:24px;filter:saturate(.8)}.game-message{display:flex;min-height:36px;align-items:center;gap:8px;margin:9px 2px 11px;color:#a4b1bf;font-size:11px}.message-indicator{width:6px;height:6px;flex:0 0 auto;border-radius:50%;background:#70dcbf;box-shadow:0 0 9px 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pan-y;-webkit-user-select:none;user-select:none}.board-row{display:grid;gap:3px}.cell{display:grid;width:var(--cell-size);height:var(--cell-size);padding:0;place-items:center;border:1px solid transparent;border-radius:5px;font-family:var(--font-mono);font-size:15px;font-weight:700;line-height:1;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background-color .1s ease,border-color .1s ease,transform .1s ease}.cell-covered{border-color:#a9c0d61f;background:linear-gradient(145deg,#324153,#273547);box-shadow:inset 0 1px #ffffff12,0 1px 2px #0000002b;color:#dfe8f1}.cell-covered:hover{border-color:#80e8ca7d;background:linear-gradient(145deg,#3c5266,#304459);transform:translateY(-1px)}.cell-flagged{border-color:#f2bb6c52;background:linear-gradient(145deg,#624c34,#463a2e);color:#ffd07c;font-size:15px}.cell-revealed{border-color:#1e2d3b17;background:#d9e3e9;color:#637688;cursor:default}.cell-mine{border-color:#ffc0ae;background:linear-gradient(145deg,#ff9c88,#ea715f);box-shadow:0 0 10px #e862503b;color:#612e2b;font-size:17px}.cell-number-1{color:#3574d4}.cell-number-2{color:#25825c}.cell-number-3{color:#dc5b51}.cell-number-4{color:#6748a3}.cell-number-5,.cell-number-6,.cell-number-7,.cell-number-8{color:#445261}.board-help{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:7px;margin:0;padding:11px 12px 12px;border-top:1px solid rgb(177 199 222 / 8%);color:#8594a4;font-size:10px;line-height:1.5;text-align:center}.board-help span{color:#a0b4c4;font-size:14px}.game-footer{display:flex;justify-content:space-between;gap:12px;margin-top:16px;color:#738294;font-size:10px}.page-footer{display:flex;justify-content:space-between;gap:16px;padding:20px 3px 0;color:#596a7b;font-family:var(--font-mono);font-size:9px;letter-spacing:.075em}.page-footer>span:last-child{color:#8090a0;letter-spacing:.01em;text-transform:none}.page-footer>span:last-child span{color:#71d7b7}@media(min-width:1200px){.board-panel{--cell-size: 36px}}@media(max-width:900px){.app-shell{padding-right:24px;padding-left:24px}.game-layout{grid-template-columns:minmax(210px,.7fr) minmax(0,1.5fr);gap:16px}.control-panel{padding:22px 18px 18px}.board-panel{--cell-size: 32px;padding:22px 18px 17px}.scoreboard{gap:13px;padding-right:13px;padding-left:13px}}@media(max-width:680px){.app-shell{padding:0 15px 18px}.site-header{min-height:65px}.header-note{font-size:10px}.game-layout{grid-template-columns:minmax(0,1fr);gap:15px;padding-top:18px}.control-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(150px,.8fr);column-gap:14px;align-items:start;padding:19px}.intro{grid-column:1 / -1;margin-bottom:17px}.intro h1{font-size:29px}.intro-copy{max-width:410px;margin-top:7px}.field-label,.difficulty-select,.control-actions{grid-column:1}.how-to-play{grid-column:1 / -1;margin-top:17px;padding-top:15px}.how-to-play ul{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.how-to-play li{align-items:flex-start;gap:7px;line-height:1.4}.first-click-note{grid-column:1 / -1;margin-top:13px}.board-panel{--cell-size: 30px;padding:18px 13px 14px}.scoreboard{min-height:65px}.score-card{min-width:98px}.score-icon{width:33px;height:33px}.board-scroll{padding:12px}.cell{border-radius:4px;font-size:13px}.cell-flagged{font-size:14px}.board-help{flex-wrap:wrap;line-height:1.5}}@media(max-width:410px){.app-shell{padding-right:10px;padding-left:10px}.header-note{gap:6px;font-size:9px}.control-panel{grid-template-columns:minmax(0,1fr);padding:17px}.intro,.field-label,.difficulty-select,.control-actions,.flag-mode-button,.how-to-play,.first-click-note{grid-column:1}.flag-mode-button{grid-row:auto;margin-top:12px}.how-to-play ul{grid-template-columns:1fr}.board-heading h2{font-size:19px}.scoreboard{gap:9px;padding:10px}.score-card{min-width:91px;gap:7px}.score-value{font-size:17px}.status-face{font-size:20px}.board-scroll{padding:10px}.board-panel{--cell-size: 30px}.board-grid,.board-row{gap:2px}.cell{border-radius:4px}.game-footer{font-size:9px}}@media(max-width:360px){.app-shell{padding-right:6px;padding-left:6px}.board-panel{padding-right:8px;padding-left:8px}.board-scroll{padding-right:0;padding-left:0}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}:root{font-family:Segoe UI Variable,Segoe UI,system-ui,sans-serif;color:#eaf0f7;background:#101722;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-optical-sizing:auto;font-weight:400;--font-display: "Segoe UI Variable", "Segoe UI", system-ui, sans-serif;--font-mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;--cell-size: 34px;--color-ink: #eaf0f7;--color-muted: #8997a9;--color-teal: #6de0c0;--color-panel: #192331;--color-panel-light: #202c3c;--color-border: rgb(181 202 222 / 11%)}*{box-sizing:border-box}body{min-height:100vh;margin:0;background:radial-gradient(ellipse at 8% 0%,rgb(50 108 113 / 20%),transparent 36rem),radial-gradient(ellipse at 95% 28%,rgb(68 85 127 / 14%),transparent 34rem),linear-gradient(135deg,#0e151e,#111b27,#121823)}button,select{font:inherit}button{color:inherit}button:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #80e8ca;outline-offset:3px}::selection{color:#0f1d25;background:#82e4c8}