:root {
--fg: #000;
--bg: #fff;
--muted: #555;
}

html, body {
margin: 0;
padding: 0;
height: 100%;
background: var(--bg);
color: var(--fg);
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* Fullscreen canvas /
canvas#game {
position: fixed;
inset: 0;
width: 100vw;
height: 100vh;
display: block;
background: var(--bg);
z-index: 0; / game is under UI and menu */
}

/* Top menu */
.menu {
position: fixed;
top: 0;
left: 0; right: 0;
height: 56px;
background: rgba(255,255,255,0.96);
border-bottom: 1px solid #000;
z-index: 1000;
}
.menu-inner {
max-width: 1200px;
margin: 0 auto;
height: 100%;
display: flex;
align-items: center;
gap: 10px;
padding: 0 12px;
}
.menu .brand {
font-weight: 800;
letter-spacing: 0.02em;
}
.menu .spacer {
flex: 1;
}
.btn {
appearance: none;
border: 1px solid #000;
background: #fff;
color: #000;
padding: 8px 12px;
border-radius: 10px;
font-weight: 700;
cursor: pointer;
}
.btn.active {
background: #000;
color: #fff;
}
.btn:focus-visible {
outline: 3px solid #222;
outline-offset: 2px;
}

/* Shared UI elements for apps (positioned over canvas) /
.title {
position: fixed;
top: 72px;       / push below the menu */
left: 0; right: 0;
margin: 0;
text-align: center;
font-weight: 800;
letter-spacing: 0.02em;
color: var(--fg);
z-index: 10;
pointer-events: none;
font-size: clamp(28px, 6vw, 72px);
}

.hud {
position: fixed;
top: 150px;      /* below title */
left: 50%;
transform: translateX(-50%);
display: flex;
align-items: center;
justify-content: center;
gap: 24px;
z-index: 10;
pointer-events: none;
font-weight: 700;
font-size: clamp(16px, 2.4vw, 24px);
color: var(--fg);
}
.hud .item { min-width: 8ch; text-align: center; }
.score { min-width: 2ch; text-align: center; }
.divider { color: var(--muted); opacity: 0.85; }

.hint {
position: fixed;
bottom: 14px;
left: 50%;
transform: translateX(-50%);
color: var(--muted);
font-size: clamp(12px, 1.6vw, 14px);
letter-spacing: 0.02em;
z-index: 10;
text-align: center;
user-select: none;
}

.overlay {
position: fixed;
left: 50%; top: 50%;
transform: translate(-50%, -50%);
background: rgba(255,255,255,0.92);
border: 1px solid #000;
padding: 16px 20px;
border-radius: 10px;
color: var(--fg);
font-weight: 700;
z-index: 20;
text-align: center;
box-shadow: 0 6px 24px rgba(0,0,0,0.12);
max-width: min(90vw, 620px);
}

.controls {
position: fixed;
top: 72px;
right: 16px;
display: flex;
gap: 10px;
z-index: 15;
}

/* Utility (hidden) */
.hidden { display: none !important; }
/* Hamburger button */
.hamburger {
appearance: none;
background: none;
border: 1px solid #000;
border-radius: 6px;
width: 38px;
height: 38px;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
gap: 5px;
cursor: pointer;
padding: 0;
flex-shrink: 0;
}
.hamburger span {
display: block;
width: 18px;
height: 2px;
background: #000;
transition: transform 0.18s ease, opacity 0.12s ease;
}
.hamburger[aria-expanded="true"] span:nth-child(1) {
transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
transform: translateY(-7px) rotate(-45deg);
}
.hamburger:focus-visible {
outline: 3px solid #222;
outline-offset: 2px;
}

/* Game drawer */
.drawer {
display: none;
flex-direction: column;
position: absolute;
top: 56px;
right: 0;
min-width: 200px;
background: #fff;
border: 1px solid #000;
border-top: none;
z-index: 999;
}
.drawer.open {
display: flex;
}
.drawer-item {
appearance: none;
background: none;
border: none;
border-bottom: 1px solid rgba(0,0,0,0.1);
color: #000;
font-family: inherit;
font-size: 15px;
font-weight: 700;
letter-spacing: 0.01em;
padding: 14px 20px;
text-align: left;
cursor: pointer;
}
.drawer-item:last-child {
border-bottom: none;
}
.drawer-item.active {
background: #000;
color: #fff;
}
.drawer-item:focus-visible {
outline: 3px solid #222;
outline-offset: -3px;
}