/* screen.css（c）- テーマ変数対応版 */

.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    transition: background 0.5s ease;
}

.screen.active {
    display: flex;
}

.screen-content {
    text-align: center;
    background: var(--ui-background);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--ui-border);
    max-width: 500px;
    width: 90%;
    color: var(--text-primary);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.screen-content h1 {
    font-size: 3em;
    margin-bottom: 30px;
    background: linear-gradient(45deg, var(--accent-secondary), var(--powerup-shrink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.screen-content h2 {
    font-size: 2.5em;
    margin-bottom: 20px;
    color: var(--accent-secondary);
    transition: color 0.3s ease;
}

.instructions {
    text-align: left;
    margin: 20px 0;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    border: 1px solid var(--ui-border);
}

.instructions p {
    margin: 10px 0;
    font-size: 1.1em;
    color: var(--text-primary);
}

/* テーマ切り替え時のスムーズな遷移 */
.screen-content,
.screen-content h1,
.screen-content h2,
.instructions {
    transition: all 0.5s ease;
}