/* Landing + leaderboard + profile + settings + about page styles. */

.subtitle {
  color: var(--text-dim);
  font-size: clamp(14px, 1.6vw, 18px);
  margin: 0 0 28px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-align: center;
}

/* Landing hero */
.hero { text-align: center; padding: 32px 0 8px; }
.hero .logo { margin-top: 8px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 18px 0 18px; }

/* Trust / value strip */
.trust-strip {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 18px;
  margin: 0 auto 24px; max-width: 720px; padding: 10px 14px;
  color: var(--text-dim); font-size: 12px; letter-spacing: 0.25em;
  text-transform: uppercase; text-align: center;
}
.trust-strip span { display: inline-flex; align-items: center; gap: 6px; }
.trust-strip span::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px var(--cyan);
}

/* Hero preview grid (auto-playing demo) */
.hero-preview-wrap {
  display: grid; place-items: center;
  margin: 6px auto 22px;
}
.hero-preview {
  --n: 4;
  display: grid;
  grid-template-columns: repeat(var(--n), 1fr);
  grid-auto-rows: 1fr;
  gap: 6px;
  width: min(340px, 80vw);
  aspect-ratio: 1 / 1;
  padding: 10px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(14px) saturate(140%);
}
.preview-tile {
  border-radius: 8px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  transition: background .18s ease, box-shadow .18s ease, border-color .18s ease, transform .18s ease;
}
.preview-tile.on.ai {
  background: var(--cyan);
  border-color: #fff;
  box-shadow: 0 0 16px var(--cyan), 0 0 36px rgba(0,240,255,0.6);
  transform: scale(1.04);
}
.preview-tile.on.human {
  background: var(--magenta);
  border-color: #fff;
  box-shadow: 0 0 16px var(--magenta), 0 0 36px rgba(255,43,214,0.6);
  transform: scale(1.04);
}
.preview-caption {
  margin-top: 10px; color: var(--text-dim);
  font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase;
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
}
.preview-caption .dot {
  display: inline-flex; align-items: center; gap: 8px;
}
.preview-caption .dot::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
}
.preview-caption .ai-dot::before { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.preview-caption .you-dot::before { background: var(--magenta); box-shadow: 0 0 8px var(--magenta); }

/* Final CTA block */
.final-cta {
  text-align: center; margin: 36px auto 12px;
  padding: 28px 20px; max-width: 720px;
}
.final-cta h2 {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: 0.15em; text-transform: uppercase;
  margin: 0 0 8px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.final-cta p { color: var(--text-dim); margin: 0 0 18px; }

/* Difficulty picker — segmented radio row that rewrites mode-card hrefs. */
.diff-picker {
  display: flex; justify-content: center; gap: 6px;
  margin: 0 auto 6px; max-width: 420px;
}
.diff-btn {
  flex: 1; padding: 8px 14px; font: inherit; cursor: pointer;
  background: var(--panel); border: 1px solid var(--panel-border);
  color: var(--text-dim); border-radius: var(--radius-sm);
  letter-spacing: 0.18em; text-transform: uppercase; font-size: 12px;
  transition: color .15s ease, border-color .15s ease, box-shadow .2s ease, background .2s ease;
}
.diff-btn:hover { color: var(--text); border-color: var(--cyan); }
.diff-btn.is-on {
  color: #fff; border-color: var(--magenta);
  background: linear-gradient(180deg, rgba(255,43,214,0.18), rgba(0,240,255,0.08));
  box-shadow: 0 0 14px rgba(255,43,214,0.35);
}
.diff-hint {
  text-align: center; color: var(--text-dim); font-size: 11px;
  letter-spacing: 0.12em; margin: 0 auto 14px; max-width: 640px;
}

/* Mode picker (links to play.html?mode=N) */
.mode-cards {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 12px; margin: 0 auto 20px; max-width: 560px;
}
.mode-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 16px 12px;
  color: var(--text); cursor: pointer;
  display: grid; gap: 4px; text-decoration: none; text-align: center;
  transition: transform .15s ease, box-shadow .2s ease, border-color .2s ease, background .2s ease;
  backdrop-filter: blur(10px);
}
.mode-card:hover { transform: translateY(-2px); border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.mode-card .mode-size { font-family: var(--font-display); font-weight: 700; font-size: 22px; letter-spacing: 0.08em; }
.mode-card .mode-name { color: var(--text-dim); font-size: 12px; letter-spacing: 0.25em; text-transform: uppercase; }
.mode-card.is-locked { opacity: 0.55; cursor: not-allowed; filter: grayscale(0.6); }
.mode-card.is-locked:hover { transform: none; border-color: var(--panel-border); box-shadow: none; }
.mode-card .mode-locked {
  display: block; margin-top: 6px; font-size: 10px; letter-spacing: 0.2em;
  color: var(--bad); text-transform: uppercase;
}
.kind-picker { max-width: 480px; margin-bottom: 6px; }

/* Features grid (landing) */
.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px; margin: 24px 0 8px;
}
.feature { padding: 18px; text-align: left; }
.feature h3 {
  font-family: var(--font-display); font-weight: 700; letter-spacing: 0.15em;
  text-transform: uppercase; font-size: 14px; color: var(--cyan);
  margin: 0 0 8px; text-shadow: var(--glow-cyan);
}
.feature p { color: var(--text-dim); margin: 0; font-size: 14px; line-height: 1.5; }

.section-title {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(20px, 3vw, 28px);
  letter-spacing: 0.15em; text-transform: uppercase;
  text-align: center; margin: 32px 0 16px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* Leaderboard */
.tabs { display: flex; gap: 8px; justify-content: center; margin: 0 0 14px; flex-wrap: wrap; }
.tab {
  font-family: var(--font-display); font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase;
  padding: 8px 16px; border-radius: 999px;
  background: var(--panel); border: 1px solid var(--panel-border); color: var(--text-dim);
  cursor: pointer; backdrop-filter: blur(10px);
  transition: color .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.tab:hover { color: var(--text); border-color: var(--cyan); }
.tab.is-active { color: var(--cyan); border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.leaderboard {
  list-style: none; padding: 14px 18px; margin: 0 auto 14px;
  max-width: 560px; text-align: left;
  display: grid; gap: 6px; counter-reset: lb;
}
.leaderboard li {
  display: grid; grid-template-columns: 36px 1fr auto; align-items: center;
  padding: 10px 12px; border-radius: 10px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.04);
  gap: 8px;
}
.leaderboard li::before {
  counter-increment: lb; content: counter(lb);
  font-family: var(--font-display); color: var(--text-dim); font-weight: 700;
}
.leaderboard li strong {
  font-family: var(--font-display); color: var(--cyan); text-shadow: 0 0 8px rgba(0,240,255,0.4);
}
.leaderboard li.empty { grid-template-columns: 1fr; color: var(--text-dim); text-align: center; }
.leaderboard li.empty::before { content: ''; }

/* Profile stats grid */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px; max-width: 720px; margin: 0 auto 18px;
}
.stat { padding: 16px; text-align: center; }
.stat .v { font-family: var(--font-display); font-weight: 900; font-size: 24px; color: var(--cyan); text-shadow: 0 0 10px rgba(0,240,255,0.5); }
.stat .k { font-size: 10px; letter-spacing: 0.25em; text-transform: uppercase; color: var(--text-dim); margin-top: 4px; }

/* Settings */
.settings { display: grid; gap: 4px; padding: 14px 18px; max-width: 480px; margin: 0 auto 14px; text-align: left; }
.setting {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 4px; border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 14px; letter-spacing: 0.05em;
}
.setting:last-child { border-bottom: none; }
.setting-range { display: grid; gap: 8px; align-items: stretch; }
.setting input[type="range"] { accent-color: var(--cyan); width: 100%; }
.setting input[type="checkbox"] {
  appearance: none; -webkit-appearance: none;
  width: 44px; height: 24px; border-radius: 999px;
  background: rgba(255,255,255,0.08); border: 1px solid var(--panel-border);
  position: relative; cursor: pointer; transition: background .2s ease;
}
.setting input[type="checkbox"]::after {
  content: ''; position: absolute; top: 2px; left: 2px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--text-dim); transition: left .2s ease, background .2s ease, box-shadow .2s ease;
}
.setting input[type="checkbox"]:checked { background: rgba(0, 240, 255, 0.25); border-color: var(--cyan); }
.setting input[type="checkbox"]:checked::after { left: 22px; background: var(--cyan); box-shadow: var(--glow-cyan); }

/* About / generic prose */
.prose { max-width: 640px; margin: 0 auto; padding: 22px 24px; line-height: 1.6; color: var(--text-dim); text-align: left; }
.prose h2 { font-family: var(--font-display); color: var(--cyan); letter-spacing: 0.12em; text-transform: uppercase; }
.prose p { margin: 10px 0; }


/* Champion cards (global leaderboard hero strip) */
.champions {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  max-width: 760px; margin: 0 auto 18px;
}
.champion-card {
  background: rgba(10, 12, 24, 0.55); border: 1px solid var(--panel-border);
  border-radius: var(--radius); padding: 14px 12px; text-align: center;
  backdrop-filter: blur(10px); display: grid; gap: 4px;
  box-shadow: var(--shadow-panel);
}
.champion-card.loading, .champion-card.empty { color: var(--text-dim); font-size: 13px; grid-column: 1 / -1; padding: 18px; }
.champion-card .ch-title {
  font-family: var(--font-display); font-weight: 700; font-size: 10px;
  letter-spacing: 0.28em; text-transform: uppercase; color: var(--text-dim);
}
.champion-card .ch-name {
  font-family: var(--font-display); font-weight: 700; font-size: 16px;
  color: var(--cyan); text-shadow: 0 0 8px rgba(0, 240, 255, 0.45);
  letter-spacing: 0.06em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.champion-card .ch-score {
  font-family: var(--font-display); font-weight: 900; font-size: 28px; color: var(--magenta);
  text-shadow: var(--glow-magenta); line-height: 1.1;
}
.champion-card .ch-meta { font-size: 11px; letter-spacing: 0.18em; color: var(--text-dim); text-transform: uppercase; }

/* Account block on Settings */
.settings .setting input[type="text"], .settings .setting input[type="email"] {
  flex: 0 1 220px; padding: 8px 10px; border-radius: 8px; border: 1px solid var(--panel-border);
  background: rgba(0,0,0,0.35); color: var(--text); font: 14px/1.2 var(--font-body); letter-spacing: 0.04em;
}
.settings .setting input[type="text"]:focus { outline: none; border-color: var(--cyan); box-shadow: var(--glow-cyan); }
.settings .setting .row-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.acct-msg { min-height: 1em; font-size: 12px; letter-spacing: 0.1em; color: var(--text-dim); padding: 0 4px 8px; text-align: right; }
.acct-msg.ok { color: var(--cyan); }
.acct-msg.err { color: var(--magenta); }

@media (max-width: 540px) {
  .champions { grid-template-columns: 1fr; }
}

/* Footer */
.site-footer { text-align: center; padding: 36px 20px; color: var(--text-dim); font-size: 12px; letter-spacing: 0.2em; text-transform: uppercase; }
.site-footer a { color: var(--cyan); text-decoration: none; }

@media (max-width: 540px) {
  .mode-cards { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .mode-card { padding: 12px 8px; }
  .mode-card .mode-size { font-size: 18px; }
}