* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body,
html {
  height: 100%;
  width: 100%;
}

:root {
  /* bg colors - dark shades */
  --bg-primary-color: #0d0d0d;
  --bg-secondary-color: #1a1a1a;
  --bg-tertiary-color: #262626;
  --bg-quaternary-color: #333333;

  /* text colors */
  --text-primary-color: #f5f5f5;
  --text-secondary-color: #b3b3b3;

  /* paddings */
  --padding-small: 8px;
  --padding-medium: 16px;
  --padding-large: 24px;
  --padding-xl: 32px;
  --padding-xxl: 40px;
  --padding-xxxl: 48px;

  /* border colors */
  --border-color-light: #404040;
  --border-color-dark: #1f1f1f;

  /* border radius */
  --border-radius-small: 4px;
  --border-radius-medium: 8px;
  --border-radius-large: 12px;
  --border-radius-xl: 16px;

  /* vibrant accent colors */
  --accent-primary: #FF6B6B;
  --accent-secondary: #4ECDC4;
  --accent-tertiary: #FFE66D;
  --accent-quaternary: #A8E6CF;
  
  /* snake colors */
  --snake-body-color: #ffffff;
}

body {
  background: linear-gradient(135deg, var(--bg-primary-color) 0%, var(--bg-secondary-color) 50%, var(--bg-primary-color) 100%);
  color: var(--text-primary-color);
  font-family: 'Audiowide', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

main,
section {
  width: 100%;
  height: 100%;
}

.btn{
    padding: var(--padding-medium) var(--padding-large);
    background-color: var(--bg-tertiary-color);
    color: var(--text-primary-color);
    border: 2px solid var(--border-color-light);
    transition: all 0.3s ease;
    border-radius: var(--border-radius-medium);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
}
.btn:hover{
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

section {
  padding: var(--padding-xxl);
  display: flex;
  flex-direction: column;
  gap: var(--padding-large);
}

section .infos {
  width: 100%;
  display: flex;
  justify-content: space-between;
}
.info {
  padding: var(--padding-small) var(--padding-medium);
  background-color: var(--bg-secondary-color);
  border: 2px solid var(--border-color-light);
  border-radius: var(--border-radius-medium);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.info h3 {
  font-weight: 700;
  letter-spacing: 1px;
}

.board {
  border: 2px solid var(--border-color-light);
  background-color: var(--bg-secondary-color);
  flex-grow: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
  grid-template-rows: repeat(auto-fill, minmax(50px, 1fr));
  gap: 0;
  border-radius: var(--border-radius-medium);
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
}

.block {
  border: 1px solid var(--border-color-dark);
  border-radius: 50%;
  transition: all 0.2s ease;
}

.fill{
    background-color: var(--snake-body-color);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.4);
}

.snake-head {
    background-color: var(--accent-tertiary) !important;
    box-shadow: 0 0 12px rgba(255, 230, 109, 0.6) !important;
    transform: scale(1.1);
}

.food{
    background-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(255, 107, 107, 0.5);
    animation: foodPulse 1.5s ease-in-out infinite;
}

@keyframes foodPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.15); }
}

.modal{
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(13, 13, 13, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal .startGame,
.modal .gameOver {
    flex-direction: column;
    background-color: var(--bg-secondary-color);
    padding: var(--padding-xxl);
    border-radius: var(--border-radius-xl);
    gap: var(--padding-large);
    text-align: center;
    border: 2px solid var(--border-color-light);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}
.modal h3 {
    font-size: 1.8rem;
    margin-bottom: var(--padding-small);
    color: var(--text-primary-color);
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
}
.startGame{
    display: flex;
}
.gameOver{
    display: none;
}

/* Mobile Controls */
.mobile-controls {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--padding-small);
  margin-top: var(--padding-medium);
  padding: var(--padding-medium);
}

.controls-row {
  display: flex;
  gap: var(--padding-small);
}

.control-btn {
  width: 60px;
  height: 60px;
  background-color: var(--bg-tertiary-color);
  color: var(--text-primary-color);
  border: 2px solid var(--border-color-light);
  border-radius: var(--border-radius-medium);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.control-btn:active {
  background-color: var(--accent-secondary);
  border-color: var(--accent-secondary);
  transform: scale(0.95);
  box-shadow: 0 1px 4px rgba(78, 205, 196, 0.4);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  section {
    padding: var(--padding-medium);
  }

  .infos {
    flex-wrap: wrap;
    gap: var(--padding-small);
  }

  .info {
    padding: var(--padding-small);
  }

  .info h3 {
    font-size: 0.9rem;
  }

  .mobile-controls {
    display: flex;
  }

  .board {
    flex-grow: 0;
    height: 60vh;
    grid-template-columns: repeat(auto-fill, minmax(30px, 1fr));
    grid-template-rows: repeat(auto-fill, minmax(30px, 1fr));
  }

  .modal .startGame,
  .modal .gameOver {
    padding: var(--padding-large);
    margin: var(--padding-medium);
  }

  .btn {
    padding: var(--padding-small) var(--padding-medium);
    font-size: 0.9rem;
  }
}