body {
    align-items: flex-start;
    padding: 1rem 0.75rem 2rem;
    min-height: 100vh;
}

.container {
    gap: 1rem;
    padding: 0.5rem 0;
}

h1 {
    letter-spacing: 0.18em;
    line-height: 1.2;
}

.notification {
    left: 1rem;
    right: 1rem;
    top: 1rem;
    width: auto;
    font-size: 0.85rem;
    text-align: center;
}

.intro-overlay,
.friend-overlay,
.difficulty-overlay,
.result-overlay {
    padding: 1rem;
}

.intro-dialog,
.friend-dialog,
.difficulty-dialog,
.result-dialog {
    width: 100%;
    max-width: 100%;
    padding: 1.25rem;
    border-radius: 16px;
    gap: 0.85rem;
}

.intro-rules {
    font-size: 0.95rem;
}

.intro-choice span {
    display: block;
    margin-bottom: 0.5rem;
}

.intro-buttons,
.intro-buttons--compact,
.friend-buttons,
.difficulty-buttons {
    flex-direction: column;
    width: 100%;
    gap: 0.75rem;
}

.intro-button,
.friend-button,
.difficulty-button,
.result-button {
    width: 100%;
    min-height: 48px;
    font-size: 1rem;
    touch-action: manipulation;
}

button:focus-visible {
    outline: 3px solid #67d4ff;
    outline-offset: 3px;
}

.game-container {
    width: 100%;
    align-items: center;
}

.game-board {
    width: 100%;
    max-width: 360px;
    border-width: 1px;
}

.result-button {
    margin-top: 1rem;
}

.move-controls {
    left: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
    flex-direction: row;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.25rem;
}

.move-button {
    flex: 1;
    padding: 0.75rem 1rem;
    letter-spacing: 0.18em;
}

@media (orientation: landscape) {
    body {
        align-items: center;
    }
}