:root {
  --bg: #020617;
  --text: #e5e7eb;
  --accent: #38bdf8;
  --muted: #94a3b8;
  --danger: #dc2626;
  --border: #1e293b;
  --panel: rgba(2, 6, 23, 0.95);
  /* Reserved heights to prevent layout shifts */
  --h-height: 72px;
  --f-height: 72px;
}

* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, sans-serif;
}

/* 1. ALPINE CLOAK & RESET */
[x-cloak] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

/* 2. HEADER & FOOTER SLOTS (Reserves space) */


.app-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 1.2rem 2rem;
  background: #000000;
  /* Pure black for maximum contrast */
  border-bottom: 1px solid #1a1a1a;
}

.app-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
}

.rainbow-text {
  font-size: 1.1rem;
  /* Larger font size */
  font-weight: 700;
  letter-spacing: 0.05rem;
  text-align: center;

  /* High-Vibrancy Neon Gradient */
  background: linear-gradient(to right,
      #00f2ff,
      /* Cyan */
      #00ff9d,
      /* Spring Green */
      #ccff00,
      /* Lime */
      #ffcc00,
      /* Gold */
      #ff00ea,
      /* Magenta */
      #00f2ff
      /* Back to Cyan */
    );

  background-size: 200% auto;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;

  animation: rainbow-flow 3s linear infinite;
}

@keyframes rainbow-flow {
  0% {
    background-position: 0% center;
  }

  100% {
    background-position: 200% center;
  }
}

.header-right {
  justify-self: end;
}

.github-link {
  color: #555;
  transition: all 0.3s ease;
}

.github-link:hover {
  color: #fff;
  filter: drop-shadow(0 0 8px #fff);
  transform: translateY(-2px);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .rainbow-text {
    font-size: 0.9rem;
  }
}

@media (max-width: 640px) {
  .header-center {
    display: none;
    /* Hide tagline on mobile to save space */
  }

  .app-header {
    grid-template-columns: 1fr 1fr;
  }
}



.footer-slot {
  min-height: var(--f-height);
  background: var(--panel);
  border-top: 1px solid var(--border);
  margin-top: auto;
  /* Pushes to bottom */
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

/* Styling injected titles */
.app-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
}

/* 3. MAIN CONTENT */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 20px;
}

.rules-container {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* 4. SVG EXPLAINER - VISIBILITY & RED ANIMATION */
.svg-slot {
  width: 100%;
  min-height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Fix for the SVG Visibility */
.svg-slot {
  width: 100%;
  min-height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: visible;
}

.svg-slot svg {
  width: 100% !important;
  height: auto !important;
  max-width: 500px;
  display: block;
}

/* ANIMATION: Glowing Pulsing X */
@keyframes xGlow {

  0%,
  100% {
    opacity: 0.5;
    stroke-width: 3;
  }

  50% {
    opacity: 1;
    stroke-width: 5;
    filter: drop-shadow(0 0 5px var(--danger));
  }
}

/* Central Term Box */
.term-box {
  fill: var(--panel);
  stroke: var(--accent);
  stroke-width: 3;
  filter: drop-shadow(0 0 12px rgba(56, 189, 248, 0.4));
}

.term-text {
  fill: var(--accent);
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.15em;
}

/* RED Forbidden Blocks */
.forbidden-group rect {
  fill: rgba(220, 38, 38, 0.25);
  /* Solid-feeling red background */
  stroke: var(--danger);
  stroke-width: 2;
}

.forbidden-group text {
  fill: var(--danger);
  font-size: 16px;
  font-weight: 700;
}

/* ANIMATED Cross/X Marks */
@keyframes xFlash {

  0%,
  100% {
    opacity: 0.6;
    stroke-width: 3;
  }

  50% {
    opacity: 1;
    stroke-width: 5;
    filter: drop-shadow(0 0 8px var(--danger));
  }
}

.cross line {
  stroke: var(--danger);
  stroke-width: 3;
  stroke-linecap: round;
  animation: xFlash 1.5s infinite ease-in-out;
}

/* Dashed Arrow Animation */
@keyframes arrowPulse {

  0%,
  100% {
    opacity: 0.3;
  }

  50% {
    opacity: 1;
  }
}

.arrows path {
  fill: none;
  stroke: var(--danger);
  stroke-width: 3;
  stroke-dasharray: 6 6;
  animation: arrowPulse 1.4s infinite;
}

/* 5. RULES LIST & UI */
.rules {
  width: 100%;
  padding-left: 1.5rem;
  margin: 0;
}

.rules li {
  font-size: 1.25rem;
  line-height: 1.6;
  color: #cbd5f5;
  margin-bottom: 12px;
}

.highlight {
  color: var(--accent);
  font-weight: 700;
}

.forbidden {
  background: color-mix(in srgb, var(--danger) 18%, transparent);
  padding: 2px 6px;
  border-radius: 6px;
  font-weight: 700;
  color: var(--danger);
}

.settings {
  display: grid;
  gap: 20px;
  max-width: 600px;
  width: 100%;
  padding: 1rem;
}

.setting {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting label {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.95rem;
}

select {
  width: 100%;
  padding: 12px 40px 12px 16px;
  /* Extra right padding for the icon */
  font-size: 1.1rem;
  font-weight: 500;
  border-radius: 12px;
  border: 2px solid var(--border);
  background-color: var(--bg);
  color: var(--text);

  /* 🔑 This removes the default browser arrow */
  appearance: none;
  -webkit-appearance: none;

  /* 🔑 This adds the custom modern arrow */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2338bdf8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;

  cursor: pointer;
  transition: all 0.2s ease;
}

/* Hover & Focus states for better UX */
select:hover {
  border-color: var(--muted);
}

select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
}

/* Ensure options look decent on desktop */
select option {
  background-color: #1e293b;
  color: var(--text);
  padding: 12px;
  font-size: 1rem;
}

.start-game {
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  text-align: center;
  padding: 18px;
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--accent);
  color: var(--bg);
  border-radius: 18px;
  text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.start-game:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(56, 189, 248, 0.3);
}

/* =========================
   MOBILE OPTIMIZATIONS
   ========================= */

@media (max-width: 480px) {
  :root {
    --h-height: 64px;
  }

  /* 1. FONT SIZE FIX: Much larger for mobile Chrome */
  .rules li {
    font-size: 1.45rem !important;
    line-height: 1.4;
    margin-bottom: 16px;
  }

  .app-main {
    padding: 16px 16px;
    justify-content: flex-start;
    /* Tighten white space at bottom */
  }

  .rules-container {
    gap: 1.5rem;
    /* Less white space between blocks */
  }

  /* 2. SVG SCALING: Prevent it from taking too much height */
  .svg-slot {
    min-height: 140px;
  }

  .svg-slot svg {
    max-width: 320px;
  }

  .app-title {
    font-size: 1.35rem;
  }

  .settings {
    width: 80vw;
  }
}

/* Small heights (iPhone SE / Landscape) */
@media (max-height: 660px) {
  .svg-slot {
    display: none;
  }

  .settings {
    width: 80vw;
  }

  /* Remove SVG to prioritize rules on tiny screens */
  .rules-container {
    gap: 1rem;
  }

  .rules li {
    font-size: 1.2rem !important;
  }
}