:root {
  /* Brand colors – UThinkFunny (navy + playful orange) */
  --uf-brand-navy: #020617;          /* background */
  --uf-brand-navy-soft: #020817;     /* panels */
  --uf-brand-teal: #f97316;          /* PRIMARY accent (orange) */
  --uf-brand-teal-strong: #fb923c;   /* stronger / hover orange */
  --uf-brand-gold: #facc15;          /* optional highlight */

  /* Text */
  --uf-text-main: #f9fafb;
  --uf-text-muted: #9ca3af;

  /* Surfaces & borders */
  --uf-surface: #020617;
  --uf-surface-soft: #020817;
  --uf-border-soft: #1f2937;

  /* Difficulty chips */
  --uf-easy: #22c55e;   /* green */
  --uf-medium: #f59e0b; /* amber */
  --uf-hard: #ef4444;   /* red */
}

/* Global page look */
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--uf-text-main);
  background: radial-gradient(circle at top, #0f172a 0, var(--uf-brand-navy) 55%);
}

/* Generic panels (hero cards, sudoku shells, etc.) */
.uf-panel {
  background: radial-gradient(circle at top, var(--uf-brand-navy-soft) 0, var(--uf-surface) 65%);
  border-radius: 18px;
  border: 1px solid var(--uf-border-soft);
  box-shadow: 0 18px 45px rgba(0,0,0,.7);
  padding: 16px 18px;
}

/* Primary buttons */
.uf-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--uf-border-soft);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  background: #020617;
  color: var(--uf-text-main);
  transition: background .15s, box-shadow .15s, transform .06s;
}

.uf-btn-primary {
  background: linear-gradient(135deg, var(--uf-brand-teal), var(--uf-brand-teal-strong));
  border-color: transparent;
  box-shadow: 0 16px 40px rgba(14,165,233,.55);
}

.uf-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(0,0,0,.5);
}

/* Difficulty chips */
/* Base badge for all chips (homepage + difficulty) */
.uf-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.08);    /* soft visible background */
  color: #ffffff !important;                /* readable on dark background */
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 8px rgba(0,0,0,0.4);
}

/* Difficulty chip colors override ONLY background + text */
.uf-badge-easy   { background: var(--uf-easy) !important;   color: #0b1120 !important; }
.uf-badge-medium { background: var(--uf-medium) !important; color: #0b1120 !important; }
.uf-badge-hard   { background: var(--uf-hard) !important;   color: #0b1120 !important; }

/* Sudoku grid cells (shared look) */
.uf-sudoku-grid td {
  background: #020617;
  color: var(--uf-text-main);
  border: 1px solid #374151;
}

.uf-sudoku-grid td.prefilled {
  color: var(--uf-text-muted);
}

.uf-sudoku-grid td.selected {
  background: #111827;
  box-shadow: 0 0 0 1px var(--uf-brand-teal);
}
/* =========================
   Hero Spotlight – Book feature
   ========================= */

.hero-spotlight {
  display: flex;
  gap: 24px;
  align-items: stretch;
}

/* Make the cover nice and large */
.spotlight-cover {
  flex: 0 0 260px; /* tweak 240–280px to taste */
}

.cover-frame {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  background: #020617;
}

/* The book thumbnail image */
.spotlight-thumb {
  display: block;
  width: 100%;
  height: auto;
}

/* Right-hand text column */
.spotlight-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
}

.spotlight-tag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--uf-text-muted);
}

.spotlight-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.spotlight-meta span {
  display: block;
  font-size: 12px;
  color: var(--uf-text-muted);
}

/* Small-screen tweak: stack cover above text */
@media (max-width: 900px) {
  .hero-spotlight {
    flex-direction: column;
  }

  .spotlight-cover {
    flex: 0 0 auto;
    max-width: 340px;
  }
}

/* Spotlight Book Cover Frame */
.spotlight-cover-frame {
  width: 340px;        /* adjust if you want larger */
  height: 510px;       /* 2:3 book ratio */
  overflow: hidden;
  border-radius: 14px;
  position: relative;
  border: 1px solid var(--uf-border-soft);
  box-shadow: 0 10px 30px rgba(0,0,0,0.45);
}

.spotlight-cover-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;     /* fills frame like the Iris portrait img */
  object-position: center;
  display: block;