:root{
    --bg: #9DD9D2;
    --card: #fff3b0;
    --accent: #000;
    --radius: 2vh;
    --shadow: 1px 1px 10px rgba(0,0,0,0.45);
}

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

body {
    background-color: var(--bg);
    font-family: 'Fredoka', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: clamp(12px, 3vh, 36px);
    min-height: 100vh;
    text-align: center;
}

/* Scalable heading */
h4 {
    font-size: clamp(20px, 5vmin, 48px);
    font-weight: 700;
    margin: clamp(8px, 2vh, 24px) 0;
}

/* Container keeps a comfortable max width on large screens */
.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(8px, 2vh, 24px);
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 12px;
}

/* Game area wrapper to center the board and controls */
.game-area {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(10px, 2vh, 18px);
}

/* Grid: responsive width, keep square ratio and centered */
.game-box {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(8px, 1.6vmin, 14px);
    width: min(72vmin, 520px); /* responsive maximum size */
    max-width: 100%;
    aspect-ratio: 1 / 1;
    margin: 0 auto; /* ensure centered */
}

/* Boxes are true touch-friendly buttons, centered content */
.box {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1 / 1;
    font-size: clamp(26px, 7vmin, 72px);
    font-family: 'Fredoka', sans-serif;
    border: none;
    box-shadow: var(--shadow);
    border-radius: min(16px, var(--radius));
    background-color: var(--card);
    color: black;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: transform .08s ease, box-shadow .12s ease, background-color .12s ease;
    touch-action: manipulation;
    padding: 0.5rem;
}

/* Smaller touch feedback */
.box:active {
    transform: scale(0.98);
}

/* Disabled state for non-clickable boxes */
.box[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Controls area styling (moved from inline) */
.controls {
    width: 100%;
    display: flex;
    gap: 12px;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Buttons styling - responsive widths */
#reset, #new-game {
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 12px;
    font-family: 'Fredoka', sans-serif;
    cursor: pointer;
    padding: clamp(8px, 1.5vmin, 14px) clamp(10px, 2vmin, 20px);
    transition: transform .08s ease, opacity .12s ease, box-shadow .12s ease;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

/* Make primary reset button prominent and adaptive */
#reset {
    font-size: clamp(16px, 4vmin, 20px);
    width: clamp(160px, 48%, 420px);
    max-width: 100%;
    height: auto;
}

/* Secondary button smaller */
#new-game {
    font-size: clamp(14px, 3vmin, 18px);
    width: clamp(120px, 34%, 260px);
    max-width: 100%;
    height: auto;
}

#reset:active, #new-game:active {
    transform: translateY(1px) scale(0.997);
}

/* Win banner layout */
.win-game {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-bottom: clamp(6px, 2vh, 20px);
}

.win-game p {
    font-size: clamp(18px, 5vmin, 36px);
    font-weight: 700;
}

/* Hidden utility */
.hidden{
    display: none !important;
}

/* Focus styles for keyboard accessibility */
.box:focus-visible, #reset:focus-visible, #new-game:focus-visible {
    outline: 3px solid rgba(0,0,0,0.12);
    outline-offset: 3px;
}

/* Responsive tweaks for narrow screens */
@media (max-width: 600px) {
    .game-box {
        width: min(86vmin, 360px);
        gap: clamp(6px, 2vmin, 10px);
    }

    .box {
        font-size: clamp(26px, 10vmin, 56px);
        border-radius: 12px;
    }

    #reset, #new-game {
        width: 100%;
        max-width: 100%;
    }

    .container {
        padding: 0 10px;
    }
}

/* Landscape/large screens: keep center and limit max width */
@media (min-width: 1200px) {
    .container { max-width: 900px; }
    .game-box { width: min(58vmin, 640px); }
}