:root {
  color-scheme: dark;
  --ink: #07101f;
  --panel: #101d31;
  --panel-2: #152740;
  --line: #29415e;
  --text: #f4f8fc;
  --muted: #9cafc5;
  --cyan: #35d6c5;
  --yellow: #ffd166;
  --red: #ff6b6b;
  --green: #66d19e;
  --shadow: 0 24px 70px rgba(0, 0, 0, .32);
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--text); background: radial-gradient(circle at 18% 12%, #123454 0, transparent 34%), radial-gradient(circle at 85% 80%, #153842 0, transparent 30%), var(--ink); }
button, input { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }

.topbar { height: 78px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(22px, 5vw, 72px); border-bottom: 1px solid rgba(156,175,197,.16); background: rgba(7,16,31,.72); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-size: 23px; font-weight: 780; letter-spacing: -.03em; }
.brand-mark { display: grid; grid-template-columns: repeat(3, 13px); gap: 2px; padding: 7px; border: 1px solid var(--line); border-radius: 9px; background: var(--panel); font-size: 10px; }
.brand-mark b { color: var(--cyan); }
.brand-mark i { color: var(--yellow); font-style: normal; }
.server-state { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 13px; }
.pulse { width: 9px; height: 9px; border-radius: 50%; background: var(--yellow); box-shadow: 0 0 0 5px rgba(255,209,102,.1); }
.pulse.online { background: var(--green); box-shadow: 0 0 0 5px rgba(102,209,158,.1); }

main { width: min(1180px, calc(100% - 36px)); margin: 0 auto; }
.hero { min-height: calc(100vh - 78px); display: grid; grid-template-columns: 1.18fr .82fr; align-items: center; gap: clamp(48px, 8vw, 110px); padding: 70px 0; }
.eyebrow { margin: 0 0 16px; color: var(--cyan); font-size: 12px; font-weight: 800; letter-spacing: .17em; }
.hero h1 { margin: 0; max-width: 690px; font-size: clamp(52px, 7vw, 88px); line-height: .98; letter-spacing: -.065em; }
.hero h1 span { color: var(--cyan); }
.hero-copy > p:not(.eyebrow) { max-width: 600px; margin: 28px 0; color: var(--muted); font-size: 19px; line-height: 1.7; }
.trust-line { display: flex; flex-wrap: wrap; gap: 10px; }
.trust-line span { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; color: #c8d4e3; font-size: 12px; }

.auth-panel { padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: rgba(16,29,49,.9); box-shadow: var(--shadow); }
.tabs { display: grid; grid-template-columns: 1fr 1fr; padding: 4px; border-radius: 12px; background: #091526; }
.tab { padding: 11px; border: 0; border-radius: 9px; color: var(--muted); background: transparent; }
.tab.active { color: var(--ink); background: var(--cyan); font-weight: 750; }
.auth-form { display: grid; gap: 18px; margin-top: 26px; }
label { color: #cbd6e4; font-size: 13px; font-weight: 700; }
input { width: 100%; margin-top: 8px; padding: 13px 14px; border: 1px solid var(--line); border-radius: 10px; outline: none; color: var(--text); background: #091526; }
input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(53,214,197,.12); }
.primary { min-height: 48px; border: 0; border-radius: 10px; color: var(--ink); background: var(--cyan); font-weight: 800; }
.primary:hover { filter: brightness(1.08); }
.form-note { min-height: 20px; margin: 16px 0 0; color: var(--muted); font-size: 12px; }
.form-note.error { color: #ff9b9b; }

.game-shell { display: grid; grid-template-columns: 260px minmax(430px, 1fr) 280px; gap: 20px; padding: 34px 0 60px; }
.sidebar, .arena, .score-panel { border: 1px solid var(--line); border-radius: 18px; background: rgba(16,29,49,.93); box-shadow: 0 14px 50px rgba(0,0,0,.18); }
.sidebar, .score-panel { padding: 20px; }
.arena { padding: 30px; }
.profile-row { display: grid; grid-template-columns: 42px 1fr auto; align-items: center; gap: 10px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.avatar { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; color: var(--ink); background: var(--cyan); font-weight: 900; }
.profile-row span, .players small { display: block; color: var(--muted); font-size: 11px; }
.profile-row strong { display: block; overflow: hidden; max-width: 105px; text-overflow: ellipsis; }
.icon-button, .copy-button { padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); background: transparent; font-size: 11px; }
.game-actions { display: grid; gap: 10px; margin: 22px 0; }
.game-actions button { display: grid; grid-template-columns: 32px 1fr; gap: 1px 9px; padding: 13px; border: 1px solid var(--line); border-radius: 12px; text-align: left; color: var(--text); background: var(--panel-2); }
.game-actions button > span { grid-row: span 2; color: var(--cyan); font-size: 22px; }
.game-actions small { color: var(--muted); }
.join-form > div { display: flex; gap: 7px; }
.join-form input { text-transform: uppercase; letter-spacing: .12em; }
.join-form button { align-self: flex-end; height: 45px; padding: 0 12px; border: 0; border-radius: 9px; color: var(--ink); background: var(--yellow); font-weight: 800; }
.text-button { padding: 10px 0; border: 0; color: var(--cyan); background: transparent; font-size: 12px; }
.danger { color: var(--red); }

.arena-heading, .score-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.arena h2, .score-panel h2 { margin: 0; font-size: 24px; letter-spacing: -.03em; }
.players { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px; margin: 28px 0; }
.players > div { display: flex; align-items: center; gap: 10px; }
.players > div:last-child { justify-content: flex-end; text-align: right; }
.symbol { display: grid; place-items: center; width: 43px; height: 43px; border-radius: 11px; font-size: 22px; font-weight: 900; }
.symbol.x { color: var(--ink); background: var(--cyan); }
.symbol.o { color: var(--ink); background: var(--yellow); }
.versus { color: var(--muted); font-size: 12px; font-weight: 800; }
.players strong { display: block; margin-top: 3px; }
.board { width: min(100%, 430px); aspect-ratio: 1; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; padding: 8px; border-radius: 19px; background: #091526; }
.cell { border: 1px solid var(--line); border-radius: 13px; color: var(--text); background: var(--panel-2); font-size: clamp(35px, 5vw, 58px); font-weight: 900; transition: transform .15s, border-color .15s, background .15s; }
.cell:not(:disabled):hover { transform: translateY(-2px); border-color: var(--cyan); background: #19314f; }
.cell.x { color: var(--cyan); }
.cell.o { color: var(--yellow); }
.turn-line { margin-top: 18px; text-align: center; color: var(--muted); font-size: 14px; }
.arena > .text-button { display: block; margin: 4px auto 0; }

.score-table { margin-top: 22px; }
.score-row { display: grid; grid-template-columns: 28px 1fr 40px; align-items: center; gap: 8px; padding: 12px 0; border-bottom: 1px solid rgba(41,65,94,.65); font-size: 13px; }
.score-row b:last-child { text-align: right; color: var(--yellow); }
.rank { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 7px; color: var(--muted); background: #091526; font-size: 11px; }
.empty { color: var(--muted); font-size: 13px; }
.security-note { display: flex; gap: 11px; margin-top: 30px; padding: 14px; border: 1px solid rgba(102,209,158,.25); border-radius: 12px; background: rgba(102,209,158,.06); }
.lock { color: var(--green); font-size: 22px; }
.security-note strong, .security-note small { display: block; }
.security-note small { margin-top: 4px; color: var(--muted); line-height: 1.4; }

.toast { position: fixed; right: 24px; bottom: 24px; max-width: min(390px, calc(100% - 48px)); padding: 13px 16px; border: 1px solid var(--line); border-radius: 11px; color: var(--text); background: #162842; box-shadow: var(--shadow); }
.toast.error { border-color: rgba(255,107,107,.5); }

@media (max-width: 1050px) {
  .game-shell { grid-template-columns: 240px 1fr; }
  .score-panel { grid-column: 1 / -1; }
  .score-table { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 30px; }
}
@media (max-width: 760px) {
  .topbar { height: 68px; }
  .server-state span:last-child { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 42px; padding: 56px 0; }
  .hero h1 { font-size: 52px; }
  .game-shell { grid-template-columns: 1fr; padding-top: 20px; }
  .score-panel { grid-column: auto; }
  .sidebar { order: 2; }
  .arena { order: 1; padding: 22px 16px; }
  .score-panel { order: 3; }
  .score-table { display: block; }
}