/* ============================================
   AI Games Arcade — Design System
   ============================================ */

/* --- Tokens --- */
:root {
  --color-bg: #0a0e1a;
  --color-bg-card: rgba(255, 255, 255, 0.07);
  --color-bg-card-hover: #0e1220;
  --color-surface: #111827;
  --color-text: #f1f5f9;
  --color-text-muted: #c1cbd8;
  --color-accent-cyan: #06d6a0;
  --color-accent-purple: #a855f7;
  --color-accent-pink: #f472b6;
  --color-accent-orange: #fb923c;
  --color-accent-yellow: #facc15;
  --color-accent-blue: #38bdf8;

  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --radius-card: 18px;
  --radius-btn: 12px;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* --- Reset --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* --- Animated Background Grid --- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  animation: gridShift 20s linear infinite;
}

@keyframes gridShift {
  0% {
    transform: translate(0, 0);
  }

  100% {
    transform: translate(60px, 60px);
  }
}

/* --- Floating Orbs (background decoration) --- */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
  animation: orbFloat 12s ease-in-out infinite alternate;
}

.orb--1 {
  width: 500px;
  height: 500px;
  background: var(--color-accent-purple);
  top: -120px;
  left: -100px;
  animation-duration: 14s;
}

.orb--2 {
  width: 400px;
  height: 400px;
  background: var(--color-accent-cyan);
  bottom: -80px;
  right: -60px;
  animation-duration: 18s;
  animation-delay: -5s;
}

.orb--3 {
  width: 300px;
  height: 300px;
  background: var(--color-accent-pink);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-duration: 16s;
  animation-delay: -8s;
}

@keyframes orbFloat {
  0% {
    transform: translate(0, 0) scale(1);
  }

  50% {
    transform: translate(30px, -20px) scale(1.08);
  }

  100% {
    transform: translate(-20px, 30px) scale(0.95);
  }
}

/* --- Layout --- */
.page-wrapper {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 0 24px;
}

/* --- Arcade Game Shared Header --- */
.arcade-header {
  width: 100%;
  max-width: 800px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin: 16px auto 24px auto;
  padding: 0 16px;
  z-index: 10;
}

.arcade-header .back-link {
  justify-self: start;
}

.arcade-header__title {
  justify-self: center;
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0;
  white-space: nowrap;
}

/* Gradient text utilities for titles */
.arcade-header__title--gradient {
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-gd {
  background-image: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-cyan), var(--color-accent-blue));
}

.title-ns {
  background-image: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-purple), var(--color-accent-pink));
}

.title-pm {
  background-image: linear-gradient(135deg, var(--color-accent-yellow), var(--color-accent-cyan));
}

.title-qc {
  background-image: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-purple), var(--color-accent-pink));
}

.title-cp {
  background-image: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-pink));
}

/* Standard Back Link */
.back-link {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--color-accent-blue);
  border: 1px solid rgba(56, 189, 248, 0.3);
  background: rgba(56, 189, 248, 0.05);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.back-link:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--color-accent-blue);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.25);
  color: #fff;
}

.arcade-header__right {
  justify-self: end;
  display: flex;
  gap: 8px;
}

/* --- Placeholder Game Page Styles --- */
.placeholder-page {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  text-align: center;
  padding: 24px;
}

.placeholder-page__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 5vw, 3rem);
  font-weight: 900;
  margin-bottom: 16px;
}

.placeholder-page__title--gravity {
  background: linear-gradient(135deg, var(--color-accent-purple), var(--color-accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.placeholder-page__title--snake {
  background: linear-gradient(135deg, var(--color-accent-cyan), var(--color-accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.placeholder-page__title--maze {
  background: linear-gradient(135deg, var(--color-accent-yellow), var(--color-accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.placeholder-page__status {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 40px;
  animation: pulse 3s ease-in-out infinite;
}

.placeholder-page__back {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent-cyan);
  text-decoration: none;
  padding: 14px 32px;
  border: 1px solid rgba(6, 214, 160, 0.3);
  border-radius: var(--radius-btn);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.placeholder-page__back:hover {
  background: rgba(6, 214, 160, 0.1);
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 24px rgba(6, 214, 160, 0.2);
}

/* --- Responsive --- */
@media (max-width: 700px) {
  .arcade-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .arcade-header__title {
    position: static;
    transform: none;
    order: -1;
  }
}