* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #041814;
  --text: #fff;
  --accent: gold;
  --subtext: rgb(215, 7, 163);
  --button-bg: black;
  --button-text: cyan;
  --shadow: rgb(255, 55, 0);
}

/* -------- DARK/LIGHT THEMES -------- */
.light-theme {
  --bg: #f8f9fa;
  --text: #111;
  --accent: #ffb700;
  --subtext: #d407a3;
  --button-bg: #fff;
  --button-text: #000;
  --shadow: #ff8800;
}

/* -------- BODY -------- */
body {
  background: var(--bg);
  font-family: "Courier New", monospace;
  color: var(--text);
  text-align: center;
  padding-top: 80px;
  transition: background 0.3s, color 0.3s;
}

/* -------- NAVBAR -------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: var(--button-bg);
  color: var(--button-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 2px solid var(--accent);
  box-shadow: 0 0 10px var(--accent);
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent);
}

.menu-toggle {
  font-size: 2rem;
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  display: none;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--button-text);
  font-size: 1.2rem;
  transition: 0.3s;
}
.nav-links a:hover {
  color: var(--accent);
}

#themeToggle {
  font-size: 1.3rem;
  background: none;
  border: 2px solid var(--accent);
  border-radius: 6px;
  padding: 5px 10px;
  color: var(--accent);
  cursor: pointer;
  transition: 0.3s;
}
#themeToggle:hover {
  background: var(--accent);
  color: var(--button-bg);
}

/* -------- MOBILE MENU -------- */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    right: 0;
    flex-direction: column;
    background: var(--button-bg);
    width: 60%;
    padding: 1rem;
    border: 2px solid var(--accent);
    border-radius: 0.5rem;
    box-shadow: 0 0 15px var(--accent);
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .nav-links.show {
    transform: translateX(0);
  }
}

/* -------- HEADER -------- */
header h1 {
  font-size: clamp(2.5rem, 6vw, 6rem);
  color: var(--accent);
}

header p {
  font-size: clamp(1rem, 3vw, 2rem);
  color: var(--subtext);
  margin-top: 0.5rem;
}

/* -------- GAME GRID -------- */
.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  margin-top: 1rem;
}

.game {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3vmin;
  width: min(90vw, 450px);
  aspect-ratio: 1 / 1;
}

.box {
  background: var(--button-bg);
  border-radius: 1.5rem;
  border: 6px solid #b1ac77;
  color: var(--button-text);
  font-size: clamp(2rem, 8vw, 4rem);
  box-shadow: 0 0 1rem var(--shadow);
  cursor: pointer;
  transition: transform 0.2s ease;
}
.box:hover {
  transform: scale(1.05);
}

/* -------- CONTROLS -------- */
.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

#resetBtn, #new-btn {
  padding: 0.8rem 1.5rem;
  font-size: clamp(1rem, 3vw, 1.5rem);
  border-radius: 0.6rem;
  background: var(--button-bg);
  color: var(--button-text);
  border: 2px solid var(--accent);
  box-shadow: 0 0 10px var(--accent);
  cursor: pointer;
  transition: 0.3s;
}
#resetBtn:hover, #new-btn:hover {
  background: var(--accent);
  color: var(--button-bg);
  box-shadow: 0 0 25px var(--accent), 0 0 50px var(--accent);
}

/* -------- SCOREBOARD -------- */
.score-board {
  background: var(--button-bg);
  color: #0f0;
  border: 3px solid var(--accent);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 0 20px var(--shadow);
  width: min(80vw, 250px);
}
.score-board h2 {
  margin-bottom: 0.5rem;
  color: var(--text);
}
.score-board p {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  margin: 0.3rem 0;
}

/* -------- MESSAGE BOX -------- */
.msg-box {
  background: rgba(0, 0, 0, 0.9);
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.msg-box.hide {
  display: none;
}
#msg {
  color: #0f0;
  font-size: clamp(2rem, 6vw, 4rem);
  margin-bottom: 1rem;
}

/* -------- MODE SELECT -------- */
#mode-select {
  margin-top: 2rem;
}
#mode-select h2 {
  color: cyan;
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 1rem;
}
#mode-select button {
  margin: 0.5rem;
  padding: 0.8rem 1.5rem;
  font-size: clamp(1rem, 3vw, 1.3rem);
  border-radius: 0.6rem;
  border: 2px solid var(--accent);
  background: var(--button-bg);
  color: var(--button-text);
  box-shadow: 0 0 10px var(--accent);
  cursor: pointer;
  transition: 0.3s;
}
#mode-select button:hover {
  background: var(--accent);
  color: var(--button-bg);
  box-shadow: 0 0 25px var(--accent), 0 0 50px var(--accent);
}