@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap");

:root{color-scheme:dark;--bg:#07111f;--panel:#0c1a2a;--panel-light:#12243a;--line:rgba(172,206,231,.13);--text:#f1f6fa;--muted:#8da2b5;--cyan:#78e0e2;--blue:#84b9f8;--green:#90e0bd}
*{box-sizing:border-box}
body{margin:0;min-width:320px;min-height:100vh;min-height:100dvh;background:radial-gradient(ellipse at 50% 0%,rgba(57,129,162,.18),transparent 34rem),var(--bg);color:var(--text);font-family:"DM Sans",Arial,sans-serif;-webkit-font-smoothing:antialiased}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit}
button:focus-visible,a:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
.page-shell{width:min(100% - 36px,510px);min-height:100vh;min-height:100dvh;margin:auto;padding:30px 0 20px;display:flex;flex-direction:column;align-items:center}
.back-link{align-self:flex-start;color:#a8bdce;font-size:13px;text-decoration:none;display:inline-flex;align-items:center;gap:9px;min-height:40px}.back-link span{font-size:18px;color:var(--cyan);transition:transform .2s}.back-link:hover span{transform:translateX(-3px)}
.game-card{width:100%;margin:auto 0;padding:clamp(24px,6vw,42px);border:1px solid var(--line);border-radius:22px;background:linear-gradient(145deg,rgba(17,36,57,.96),rgba(9,22,37,.97));box-shadow:0 24px 90px #0005}
.game-heading{text-align:center}.eyebrow{margin:0 0 12px;color:#9db4c6;font-size:10px;font-weight:700;letter-spacing:.16em}.eyebrow span{display:inline-block;width:7px;height:7px;margin-right:5px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px #78e0e2}.game-heading h1{margin:0;font:800 clamp(38px,10vw,54px)/1.08 Manrope,Arial,sans-serif;letter-spacing:-.065em}.game-heading h1 em{font-style:normal;color:var(--cyan)}.intro{margin:10px 0 25px;color:var(--muted);font-size:14px}
.mode-switch{display:grid;grid-template-columns:1fr 1fr;gap:4px;padding:4px;border:1px solid var(--line);border-radius:12px;background:#071321}.mode-button{min-height:42px;border:0;border-radius:9px;background:transparent;color:#93a8ba;font-size:13px;font-weight:600;cursor:pointer;transition:background .2s,color .2s}.mode-button.active{background:#18334c;color:#eaf8ff;box-shadow:inset 0 0 0 1px #294d69}
.scoreboard{max-width:330px;margin:21px auto 13px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:14px}.score{min-width:90px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid transparent;border-radius:12px;color:#8ea4b7;transition:background .2s,border-color .2s}.score.active{border-color:rgba(120,224,226,.28);background:rgba(82,170,185,.09);color:#eaf7fb}.score-name{font-size:10px;font-weight:700;letter-spacing:.08em}.score-name b{margin-left:5px;color:var(--cyan)}.score strong{font:700 22px Manrope,sans-serif}.score-divider{color:#5f788c}
.status{min-height:24px;margin:0 0 16px;text-align:center;color:#bbcad7;font-size:13px}.status.result{color:var(--cyan);font-weight:700}
.board{width:min(100%,354px);aspect-ratio:1;margin:auto;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.cell{display:grid;place-items:center;min-width:0;aspect-ratio:1;border:1px solid rgba(172,206,231,.12);border-radius:15px;background:linear-gradient(145deg,#11263b,#0c1b2d);color:var(--cyan);font:800 clamp(40px,13vw,66px)/1 Manrope,sans-serif;cursor:pointer;transition:transform .15s,border-color .15s,background .15s,box-shadow .15s}.cell:not(:disabled):hover{transform:translateY(-2px);border-color:rgba(120,224,226,.45);background:#152c42}.cell:disabled{cursor:default}.cell[data-mark="O"]{color:var(--blue)}.cell.win{border-color:rgba(120,224,226,.6);background:rgba(67,166,169,.15);box-shadow:0 0 26px rgba(78,205,211,.13)}
.game-actions{display:flex;justify-content:center;align-items:center;gap:17px;margin-top:23px}.new-game{min-height:46px;padding:0 20px;border:1px solid #73ced4;border-radius:999px;background:linear-gradient(120deg,#80dce3,#84b9f8);color:#071421;font-size:13px;font-weight:700;cursor:pointer;transition:transform .2s,filter .2s}.new-game:hover{transform:translateY(-2px);filter:brightness(1.08)}.new-game span{margin-left:8px;font-size:18px}.reset-score{min-height:42px;padding:0 9px;border:0;background:transparent;color:#9db0c0;font-size:12px;text-decoration:underline;text-decoration-color:#526a7d;text-underline-offset:4px;cursor:pointer}.reset-score:hover{color:var(--text)}
footer{width:100%;padding-top:18px;display:flex;justify-content:space-between;gap:12px;color:#71879a;font-size:10px}.footer-mark{font-weight:800;letter-spacing:.1em;color:#eaf1f5}.footer-mark span{color:var(--cyan)}
@media(max-width:420px){.page-shell{width:min(100% - 24px,510px);padding-top:15px}.game-card{padding:23px 17px;border-radius:18px}.board{gap:7px}.cell{border-radius:12px}.scoreboard{gap:7px}.score{min-width:0;padding:9px 10px}.game-actions{gap:10px}.reset-score{font-size:11px}footer{font-size:9px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}