* { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; }

button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }

.game-shell { width: min(1080px, calc(100% - 32px)); margin: 0 auto; padding: 15px 0 40px; }
.game-heading { max-width: 700px; margin: 0 auto 24px auto; text-align: center; }
.eyebrow { margin: 0 0 10px; color: #ff7b00; font: 700 .68rem 'Chakra Petch', sans-serif; letter-spacing: 2.5px; }
.status-dot { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: #ff7b00; box-shadow: 0 0 12px #ff7b00; }
.game-heading p:last-child { max-width: 615px; margin: 0 auto; color: #a7bac5; font-size: .94rem; line-height: 1.75; }
.panel { border: 1px solid rgba(255,255,255,.1); border-radius: 18px; background: linear-gradient(145deg, rgba(11,28,39,.9), rgba(5,12,18,.85)); box-shadow: 0 20px 70px rgba(0, 0, 0, .38); }

.scoreboard { display: grid; grid-template-columns: 1fr 1.4fr 1fr; align-items: center; margin-bottom: 18px; padding: 20px 25px; border-top: 1px solid rgba(0,183,255,.55); }
.score-side { text-align: center; }
.score-label, .score-caption, .match-kicker, .target-score { display: block; color: #7d929f; font: 700 .62rem 'Chakra Petch', sans-serif; letter-spacing: 2px; }
.score-side strong { display: block; margin: 2px 0 -3px; font: 900 clamp(2.5rem, 6vw, 4rem) 'Orbitron', sans-serif; }
.player-side strong { color: #39ff14; text-shadow: 0 0 22px rgba(57,255,20,.28); }
.cpu-side strong { color: #ff7b00; text-shadow: 0 0 22px rgba(255,123,0,.28); }
.match-status { padding: 0 15px; text-align: center; border-right: 1px solid rgba(255,255,255,.1); border-left: 1px solid rgba(255,255,255,.1); }
.match-status strong { display: block; margin: 7px 0; color: #00b7ff; font: 700 .9rem 'Chakra Petch', sans-serif; letter-spacing: 1px; }
.target-score { color: #587482; font-size: .55rem; letter-spacing: 1px; }

.arena { padding: 23px 25px 21px; border-top: 1px solid rgba(255,123,0,.58); }
.arena-header, .choice-heading, .panel-title { display: flex; justify-content: space-between; align-items: center; gap: 16px; color: #7d929f; font: 700 .65rem 'Chakra Petch', sans-serif; letter-spacing: 2px; }
.arena-header span:last-child, .panel-title span:last-child { color: #ff7b00; }
.tag { padding: 6px 9px; color: #ff7b00; border: 1px solid rgba(255,123,0,.3); border-radius: 7px; font-size: .6rem; }
.duel-board { display: grid; grid-template-columns: 1fr 80px 1fr; align-items: center; max-width: 730px; margin: 31px auto 13px; }
.combatant { display: grid; justify-items: center; gap: 10px; }
.combatant-label { color: #7d929f; font: 700 .62rem 'Chakra Petch', sans-serif; letter-spacing: 1.5px; }
.combatant strong { min-height: 17px; color: #eaf6fb; font: 700 .72rem 'Chakra Petch', sans-serif; letter-spacing: 1px; }
.choice-display { width: 150px; height: 150px; display: grid; place-items: center; border: 1px solid; border-radius: 50%; background: rgba(0, 183, 255, .05); transition: transform .28s, box-shadow .28s, border-color .28s; }
.choice-display span { color: #00b7ff; font: 700 5rem 'Chakra Petch', sans-serif; line-height: 1; }
.choice-player { border-color: rgba(57,255,20,.42); box-shadow: inset 0 0 30px rgba(57,255,20,.08), 0 0 24px rgba(57,255,20,.08); }
.choice-player span { color: #39ff14; }
.choice-cpu { border-color: rgba(255,123,0,.42); box-shadow: inset 0 0 30px rgba(255,123,0,.08), 0 0 24px rgba(255,123,0,.08); }
.choice-cpu span { color: #ff7b00; }
.choice-display.is-win { transform: scale(1.05); box-shadow: 0 0 35px rgba(57,255,20,.38); }
.choice-display.is-loss { box-shadow: 0 0 35px rgba(255,59,107,.3); border-color: #ff3b6b; }
.choice-display.is-draw { box-shadow: 0 0 35px rgba(0,183,255,.3); }
.versus { display: grid; justify-items: center; gap: 8px; color: #00b7ff; font: 900 1rem 'Orbitron', sans-serif; }
.versus i { width: 1px; height: 38px; display: block; background: linear-gradient(#00b7ff, transparent); }
.round-message { min-height: 28px; color: #b7cbd4; font: 600 .84rem 'Chakra Petch', sans-serif; letter-spacing: .4px; text-align: center; }
.round-message.is-win { color: #39ff14; }
.round-message.is-loss { color: #ff7192; }
.round-message.is-draw { color: #00b7ff; }
.choice-heading { margin: 26px 0 12px; }
.choice-heading small { color: #7d929f; font-size: .58rem; font-weight: 400; letter-spacing: .7px; text-transform: none; }
.choices { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.choice-button { min-height: 126px; display: grid; justify-items: center; align-content: center; gap: 5px; border: 1px solid rgba(0,183,255,.25); border-radius: 12px; color: #c9e4ed; background: rgba(0,183,255,.05); cursor: pointer; font: 700 .75rem 'Chakra Petch', sans-serif; letter-spacing: 1px; transition: transform .18s, border-color .18s, background .18s, box-shadow .18s; }
.choice-button:hover, .choice-button:focus-visible { transform: translateY(-4px); border-color: #00b7ff; background: rgba(0,183,255,.13); box-shadow: 0 0 21px rgba(0,183,255,.18); outline: none; }
.choice-symbol { color: #00b7ff; font-size: 2.35rem; line-height: 1; }
.choice-button small { color: #7d929f; font: 600 .56rem 'Chakra Petch', sans-serif; letter-spacing: 1.2px; }
.choice-button.is-selected { border-color: #39ff14; box-shadow: 0 0 24px rgba(57,255,20,.2); }
.choice-button:disabled { cursor: not-allowed; opacity: .58; }
.reset-button { display: block; margin: 17px auto 0; padding: 7px 10px; border: 0; color: #7d929f; background: transparent; cursor: pointer; font: 600 .63rem 'Chakra Petch', sans-serif; letter-spacing: 1px; text-transform: uppercase; transition: color .2s; }
.reset-button:hover, .reset-button:focus-visible { color: #ff7b00; outline: none; }
.reset-button span { margin-left: 4px; color: #ff7b00; font-size: 1rem; }

.lower-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.history-panel, .rules-panel { min-height: 198px; padding: 20px 22px; }
.panel-title { padding-bottom: 13px; border-bottom: 1px solid rgba(255,255,255,.1); }
.panel-title span:last-child { font-size: .57rem; }
.history-list { max-height: 145px; overflow: auto; }
.empty-history { margin: 22px 0 0; color: #7d929f; font-size: .72rem; text-align: center; }
.history-item { display: grid; grid-template-columns: 32px 1fr auto; align-items: center; gap: 9px; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.06); color: #a9bfca; font: 600 .67rem 'Chakra Petch', sans-serif; }
.history-item:last-child { border-bottom: 0; }
.history-index { color: #7d929f; }
.history-result { justify-self: end; padding: 3px 6px; border-radius: 4px; font-size: .56rem; letter-spacing: 1px; }
.history-result.win { color: #39ff14; background: rgba(57,255,20,.1); }
.history-result.loss { color: #ff7192; background: rgba(255,59,107,.1); }
.history-result.draw { color: #00b7ff; background: rgba(0,183,255,.1); }
.rules-list { margin-top: 17px; }
.rules-list p { margin: 0 0 8px; color: #9bb0ba; font-size: .75rem; }
.rules-list b { color: #eaf6fb; font-family: 'Chakra Petch', sans-serif; letter-spacing: 1px; }
.rules-note { padding-top: 9px; border-top: 1px solid rgba(255,255,255,.1); color: #ff7b00 !important; font-size: .68rem !important; }

@media (max-width: 760px) {
    .game-shell { padding-top: 10px; }
    .scoreboard { padding: 18px 12px; }
    .score-side strong { font-size: 2.7rem; }
    .match-status { padding: 0 8px; }
    .duel-board { grid-template-columns: 1fr 48px 1fr; }
    .choice-display { width: 112px; height: 112px; }
    .choice-display span { font-size: 3.6rem; }
}
@media (max-width: 560px) {
    .game-shell { width: min(100% - 22px, 1080px); }
    .arena, .history-panel, .rules-panel { padding: 17px; }
    .lower-grid { grid-template-columns: 1fr; }
    .choices { gap: 7px; }
    .choice-button { min-height: 105px; font-size: .65rem; }
    .choice-symbol { font-size: 1.9rem; }
    .choice-display { width: 92px; height: 92px; }
    .choice-display span { font-size: 3rem; }
    .combatant-label { font-size: .55rem; letter-spacing: 1px; }
    .duel-board { grid-template-columns: 1fr 30px 1fr; }
    .versus { font-size: .76rem; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}